Mercurial > genshi > genshi-test
annotate markup/template.py @ 149:7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
| author | cmlenz |
|---|---|
| date | Tue, 15 Aug 2006 21:59:07 +0000 |
| parents | 56d534eb53f9 |
| children | 39a8012f60e3 |
| rev | line source |
|---|---|
| 1 | 1 # -*- coding: utf-8 -*- |
| 2 # | |
|
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3 # Copyright (C) 2006 Edgewall Software |
| 1 | 4 # All rights reserved. |
| 5 # | |
| 6 # This software is licensed as described in the file COPYING, which | |
| 7 # you should have received as part of this distribution. The terms | |
|
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8 # are also available at http://markup.edgewall.org/wiki/License. |
| 1 | 9 # |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
|
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12 # history and logs, available at http://markup.edgewall.org/log/. |
| 1 | 13 |
| 82 | 14 """Implementation of the template engine.""" |
| 1 | 15 |
|
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16 try: |
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17 from collections import deque |
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18 except ImportError: |
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19 class deque(list): |
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20 def appendleft(self, x): self.insert(0, x) |
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21 def popleft(self): return self.pop(0) |
| 1 | 22 import compiler |
| 23 import os | |
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24 import posixpath |
| 1 | 25 import re |
| 26 from StringIO import StringIO | |
| 27 | |
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28 from markup.core import Attributes, Namespace, Stream, StreamEventKind, _ensure |
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29 from markup.core import START, END, START_NS, END_NS, TEXT, COMMENT |
| 1 | 30 from markup.eval import Expression |
| 69 | 31 from markup.input import XMLParser |
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32 from markup.path import Path |
| 1 | 33 |
|
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34 __all__ = ['TemplateSyntaxError', 'TemplateNotFound', 'Template', |
| 1 | 35 'TemplateLoader'] |
| 36 | |
| 37 | |
| 38 class TemplateError(Exception): | |
| 39 """Base exception class for errors related to template processing.""" | |
| 40 | |
| 41 | |
| 42 class TemplateSyntaxError(TemplateError): | |
| 43 """Exception raised when an expression in a template causes a Python syntax | |
| 44 error.""" | |
| 45 | |
| 46 def __init__(self, message, filename='<string>', lineno=-1, offset=-1): | |
| 47 if isinstance(message, SyntaxError) and message.lineno is not None: | |
| 48 message = str(message).replace(' (line %d)' % message.lineno, '') | |
| 80 | 49 message = '%s (%s, line %d)' % (message, filename, lineno) |
| 1 | 50 TemplateError.__init__(self, message) |
| 51 self.filename = filename | |
| 52 self.lineno = lineno | |
| 53 self.offset = offset | |
| 54 | |
| 55 | |
| 56 class BadDirectiveError(TemplateSyntaxError): | |
| 57 """Exception raised when an unknown directive is encountered when parsing | |
| 58 a template. | |
| 59 | |
| 60 An unknown directive is any attribute using the namespace for directives, | |
| 61 with a local name that doesn't match any registered directive. | |
| 62 """ | |
| 63 | |
| 64 def __init__(self, name, filename='<string>', lineno=-1): | |
| 80 | 65 msg = 'bad directive "%s" (%s, line %d)' % (name.localname, filename, |
| 66 lineno) | |
| 67 TemplateSyntaxError.__init__(self, msg, filename, lineno) | |
| 1 | 68 |
| 69 | |
| 70 class TemplateNotFound(TemplateError): | |
| 71 """Exception raised when a specific template file could not be found.""" | |
| 72 | |
| 73 def __init__(self, name, search_path): | |
| 74 TemplateError.__init__(self, 'Template "%s" not found' % name) | |
| 75 self.search_path = search_path | |
| 76 | |
| 77 | |
| 78 class Context(object): | |
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79 """Container for template input data. |
| 1 | 80 |
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81 A context provides a stack of scopes (represented by dictionaries). |
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82 |
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83 Template directives such as loops can push a new scope on the stack with |
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84 data that should only be available inside the loop. When the loop |
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85 terminates, that scope can get popped off the stack again. |
| 1 | 86 |
| 87 >>> ctxt = Context(one='foo', other=1) | |
| 88 >>> ctxt.get('one') | |
| 89 'foo' | |
| 90 >>> ctxt.get('other') | |
| 91 1 | |
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92 >>> ctxt.push(dict(one='frost')) |
| 1 | 93 >>> ctxt.get('one') |
| 94 'frost' | |
| 95 >>> ctxt.get('other') | |
| 96 1 | |
| 97 >>> ctxt.pop() | |
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98 {'one': 'frost'} |
| 1 | 99 >>> ctxt.get('one') |
| 100 'foo' | |
| 101 """ | |
| 102 | |
| 103 def __init__(self, **data): | |
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104 self.frames = deque([data]) |
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105 self.pop = self.frames.popleft |
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106 self.push = self.frames.appendleft |
| 1 | 107 |
| 108 def __repr__(self): | |
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109 return repr(self.frames) |
| 1 | 110 |
| 111 def __setitem__(self, key, value): | |
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112 """Set a variable in the current scope.""" |
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113 self.frames[0][key] = value |
| 1 | 114 |
| 115 def get(self, key): | |
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116 """Get a variable's value, starting at the current scope and going |
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117 upward. |
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118 """ |
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119 for frame in self.frames: |
| 1 | 120 if key in frame: |
| 121 return frame[key] | |
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122 __getitem__ = get |
| 1 | 123 |
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124 def push(self, data): |
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125 """Push a new scope on the stack.""" |
| 1 | 126 |
| 127 def pop(self): | |
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128 """Pop the top-most scope from the stack.""" |
| 1 | 129 |
| 130 | |
| 131 class Directive(object): | |
| 132 """Abstract base class for template directives. | |
| 133 | |
| 54 | 134 A directive is basically a callable that takes three positional arguments: |
| 135 `ctxt` is the template data context, `stream` is an iterable over the | |
| 136 events that the directive applies to, and `directives` is is a list of | |
| 137 other directives on the same stream that need to be applied. | |
| 1 | 138 |
| 139 Directives can be "anonymous" or "registered". Registered directives can be | |
| 140 applied by the template author using an XML attribute with the | |
| 141 corresponding name in the template. Such directives should be subclasses of | |
| 31 | 142 this base class that can be instantiated with the value of the directive |
| 143 attribute as parameter. | |
| 1 | 144 |
| 145 Anonymous directives are simply functions conforming to the protocol | |
| 146 described above, and can only be applied programmatically (for example by | |
| 147 template filters). | |
| 148 """ | |
| 149 __slots__ = ['expr'] | |
| 150 | |
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151 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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152 try: |
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153 self.expr = value and Expression(value, filename, lineno) or None |
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154 except SyntaxError, err: |
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155 raise TemplateSyntaxError(err, filename, lineno, |
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156 offset + (err.offset or 0)) |
| 1 | 157 |
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158 def __call__(self, stream, ctxt, directives): |
| 1 | 159 raise NotImplementedError |
| 160 | |
| 161 def __repr__(self): | |
| 162 expr = '' | |
| 163 if self.expr is not None: | |
| 164 expr = ' "%s"' % self.expr.source | |
| 165 return '<%s%s>' % (self.__class__.__name__, expr) | |
| 166 | |
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167 |
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168 def _apply_directives(stream, ctxt, directives): |
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169 if directives: |
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170 stream = directives[0](iter(stream), ctxt, directives[1:]) |
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171 return stream |
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172 |
| 1 | 173 |
| 174 class AttrsDirective(Directive): | |
| 175 """Implementation of the `py:attrs` template directive. | |
| 176 | |
| 177 The value of the `py:attrs` attribute should be a dictionary. The keys and | |
| 178 values of that dictionary will be added as attributes to the element: | |
| 179 | |
| 61 | 180 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
| 1 | 181 ... <li py:attrs="foo">Bar</li> |
| 182 ... </ul>''') | |
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183 >>> print tmpl.generate(foo={'class': 'collapse'}) |
| 1 | 184 <ul> |
| 185 <li class="collapse">Bar</li> | |
| 186 </ul> | |
| 187 | |
| 188 If the value evaluates to `None` (or any other non-truth value), no | |
| 189 attributes are added: | |
| 190 | |
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191 >>> print tmpl.generate(foo=None) |
| 1 | 192 <ul> |
| 193 <li>Bar</li> | |
| 194 </ul> | |
| 195 """ | |
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196 __slots__ = [] |
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197 |
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198 def __call__(self, stream, ctxt, directives): |
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199 def _generate(): |
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200 kind, (tag, attrib), pos = stream.next() |
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201 attrs = self.expr.evaluate(ctxt) |
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202 if attrs: |
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203 attrib = Attributes(attrib[:]) |
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204 if isinstance(attrs, Stream): |
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205 try: |
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206 attrs = iter(attrs).next() |
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207 except StopIteration: |
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208 attrs = [] |
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209 elif not isinstance(attrs, list): # assume it's a dict |
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210 attrs = attrs.items() |
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211 for name, value in attrs: |
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212 if value is None: |
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213 attrib.remove(name) |
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214 else: |
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215 attrib.set(name, unicode(value).strip()) |
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216 yield kind, (tag, attrib), pos |
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217 for event in stream: |
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218 yield event |
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219 |
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220 return _apply_directives(_generate(), ctxt, directives) |
| 1 | 221 |
| 222 | |
| 223 class ContentDirective(Directive): | |
| 224 """Implementation of the `py:content` template directive. | |
| 225 | |
| 226 This directive replaces the content of the element with the result of | |
| 227 evaluating the value of the `py:content` attribute: | |
| 228 | |
| 61 | 229 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
| 1 | 230 ... <li py:content="bar">Hello</li> |
| 231 ... </ul>''') | |
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232 >>> print tmpl.generate(bar='Bye') |
| 1 | 233 <ul> |
| 234 <li>Bye</li> | |
| 235 </ul> | |
| 236 """ | |
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237 __slots__ = [] |
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238 |
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239 def __call__(self, stream, ctxt, directives): |
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240 def _generate(): |
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241 kind, data, pos = stream.next() |
| 101 | 242 if kind is START: |
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243 yield kind, data, pos # emit start tag |
| 69 | 244 yield EXPR, self.expr, pos |
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245 previous = stream.next() |
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246 for event in stream: |
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247 previous = event |
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248 if previous is not None: |
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249 yield previous |
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250 |
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251 return _apply_directives(_generate(), ctxt, directives) |
| 1 | 252 |
| 253 | |
| 254 class DefDirective(Directive): | |
| 255 """Implementation of the `py:def` template directive. | |
| 256 | |
| 257 This directive can be used to create "Named Template Functions", which | |
| 258 are template snippets that are not actually output during normal | |
| 259 processing, but rather can be expanded from expressions in other places | |
| 260 in the template. | |
| 261 | |
| 262 A named template function can be used just like a normal Python function | |
| 263 from template expressions: | |
| 264 | |
| 61 | 265 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 266 ... <p py:def="echo(greeting, name='world')" class="message"> |
| 267 ... ${greeting}, ${name}! | |
| 268 ... </p> | |
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269 ... ${echo('Hi', name='you')} |
| 1 | 270 ... </div>''') |
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271 >>> print tmpl.generate(bar='Bye') |
| 1 | 272 <div> |
| 273 <p class="message"> | |
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274 Hi, you! |
| 1 | 275 </p> |
| 276 </div> | |
| 277 | |
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278 If a function does not require parameters, the parenthesis can be omitted |
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279 both when defining and when calling it: |
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280 |
| 61 | 281 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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282 ... <p py:def="helloworld" class="message"> |
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283 ... Hello, world! |
| 1 | 284 ... </p> |
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285 ... ${helloworld} |
| 1 | 286 ... </div>''') |
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287 >>> print tmpl.generate(bar='Bye') |
| 1 | 288 <div> |
| 289 <p class="message"> | |
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290 Hello, world! |
| 1 | 291 </p> |
| 292 </div> | |
| 293 """ | |
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294 __slots__ = ['name', 'args', 'defaults', 'stream', 'directives'] |
| 1 | 295 |
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296 ATTRIBUTE = 'function' |
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297 |
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298 def __init__(self, args, filename=None, lineno=-1, offset=-1): |
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299 Directive.__init__(self, None, filename, lineno, offset) |
| 1 | 300 ast = compiler.parse(args, 'eval').node |
| 301 self.args = [] | |
| 302 self.defaults = {} | |
| 303 if isinstance(ast, compiler.ast.CallFunc): | |
| 304 self.name = ast.node.name | |
| 305 for arg in ast.args: | |
| 306 if isinstance(arg, compiler.ast.Keyword): | |
| 307 self.args.append(arg.name) | |
| 308 self.defaults[arg.name] = arg.expr.value | |
| 309 else: | |
| 310 self.args.append(arg.name) | |
| 311 else: | |
| 312 self.name = ast.name | |
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313 self.stream, self.directives = [], [] |
| 1 | 314 |
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315 def __call__(self, stream, ctxt, directives): |
| 1 | 316 self.stream = list(stream) |
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317 self.directives = directives |
| 1 | 318 ctxt[self.name] = lambda *args, **kwargs: self._exec(ctxt, *args, |
| 319 **kwargs) | |
| 320 return [] | |
| 321 | |
| 322 def _exec(self, ctxt, *args, **kwargs): | |
| 323 scope = {} | |
| 324 args = list(args) # make mutable | |
| 325 for name in self.args: | |
| 326 if args: | |
| 327 scope[name] = args.pop(0) | |
| 328 else: | |
| 329 scope[name] = kwargs.pop(name, self.defaults.get(name)) | |
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330 ctxt.push(scope) |
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331 for event in _apply_directives(self.stream, ctxt, self.directives): |
| 1 | 332 yield event |
| 333 ctxt.pop() | |
| 334 | |
| 335 | |
| 336 class ForDirective(Directive): | |
| 31 | 337 """Implementation of the `py:for` template directive for repeating an |
| 338 element based on an iterable in the context data. | |
| 1 | 339 |
| 61 | 340 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
| 1 | 341 ... <li py:for="item in items">${item}</li> |
| 342 ... </ul>''') | |
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343 >>> print tmpl.generate(items=[1, 2, 3]) |
| 1 | 344 <ul> |
| 345 <li>1</li><li>2</li><li>3</li> | |
| 346 </ul> | |
| 347 """ | |
| 348 __slots__ = ['targets'] | |
| 349 | |
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350 ATTRIBUTE = 'each' |
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351 |
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352 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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353 targets, value = value.split(' in ', 1) |
| 1 | 354 self.targets = [str(name.strip()) for name in targets.split(',')] |
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355 Directive.__init__(self, value.strip(), filename, lineno, offset) |
| 1 | 356 |
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357 def __call__(self, stream, ctxt, directives): |
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358 iterable = self.expr.evaluate(ctxt) |
| 101 | 359 if iterable is None: |
| 360 return | |
| 361 | |
| 362 scope = {} | |
| 363 stream = list(stream) | |
| 364 targets = self.targets | |
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365 single = len(targets) == 1 |
| 101 | 366 for item in iter(iterable): |
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367 if single: |
| 101 | 368 scope[targets[0]] = item |
| 369 else: | |
| 370 for idx, name in enumerate(targets): | |
| 371 scope[name] = item[idx] | |
| 372 ctxt.push(scope) | |
| 373 for event in _apply_directives(stream, ctxt, directives): | |
| 374 yield event | |
| 375 ctxt.pop() | |
| 1 | 376 |
| 377 def __repr__(self): | |
| 378 return '<%s "%s in %s">' % (self.__class__.__name__, | |
| 379 ', '.join(self.targets), self.expr.source) | |
| 380 | |
| 381 | |
| 382 class IfDirective(Directive): | |
| 31 | 383 """Implementation of the `py:if` template directive for conditionally |
| 384 excluding elements from being output. | |
| 1 | 385 |
| 61 | 386 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 387 ... <b py:if="foo">${bar}</b> |
| 388 ... </div>''') | |
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389 >>> print tmpl.generate(foo=True, bar='Hello') |
| 1 | 390 <div> |
| 391 <b>Hello</b> | |
| 392 </div> | |
| 393 """ | |
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394 __slots__ = [] |
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395 |
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396 ATTRIBUTE = 'test' |
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397 |
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398 def __call__(self, stream, ctxt, directives): |
| 1 | 399 if self.expr.evaluate(ctxt): |
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400 return _apply_directives(stream, ctxt, directives) |
| 1 | 401 return [] |
| 402 | |
| 403 | |
| 404 class MatchDirective(Directive): | |
| 405 """Implementation of the `py:match` template directive. | |
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406 |
| 61 | 407 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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408 ... <span py:match="greeting"> |
| 1 | 409 ... Hello ${select('@name')} |
| 410 ... </span> | |
| 411 ... <greeting name="Dude" /> | |
| 412 ... </div>''') | |
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413 >>> print tmpl.generate() |
| 1 | 414 <div> |
| 415 <span> | |
| 416 Hello Dude | |
| 417 </span> | |
| 418 </div> | |
| 419 """ | |
| 420 __slots__ = ['path', 'stream'] | |
| 421 | |
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422 ATTRIBUTE = 'path' |
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423 |
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424 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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425 Directive.__init__(self, None, filename, lineno, offset) |
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426 self.path = Path(value, filename, lineno) |
| 1 | 427 self.stream = [] |
| 428 | |
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429 def __call__(self, stream, ctxt, directives): |
| 1 | 430 self.stream = list(stream) |
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431 ctxt._match_templates.append((self.path.test(ignore_context=True), |
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432 self.path, self.stream, directives)) |
| 1 | 433 return [] |
| 434 | |
| 435 def __repr__(self): | |
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436 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
| 1 | 437 |
| 438 | |
| 439 class ReplaceDirective(Directive): | |
| 440 """Implementation of the `py:replace` template directive. | |
| 441 | |
| 31 | 442 This directive replaces the element with the result of evaluating the |
| 443 value of the `py:replace` attribute: | |
| 444 | |
| 61 | 445 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 446 ... <span py:replace="bar">Hello</span> |
| 447 ... </div>''') | |
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448 >>> print tmpl.generate(bar='Bye') |
| 1 | 449 <div> |
| 450 Bye | |
| 451 </div> | |
| 452 | |
| 453 This directive is equivalent to `py:content` combined with `py:strip`, | |
| 454 providing a less verbose way to achieve the same effect: | |
| 455 | |
| 61 | 456 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 457 ... <span py:content="bar" py:strip="">Hello</span> |
| 458 ... </div>''') | |
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459 >>> print tmpl.generate(bar='Bye') |
| 1 | 460 <div> |
| 461 Bye | |
| 462 </div> | |
| 463 """ | |
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464 __slots__ = [] |
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465 |
| 54 | 466 def __call__(self, stream, ctxt, directives): |
| 1 | 467 kind, data, pos = stream.next() |
| 69 | 468 yield EXPR, self.expr, pos |
| 1 | 469 |
| 470 | |
| 471 class StripDirective(Directive): | |
| 472 """Implementation of the `py:strip` template directive. | |
| 473 | |
| 474 When the value of the `py:strip` attribute evaluates to `True`, the element | |
| 475 is stripped from the output | |
| 476 | |
| 61 | 477 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 478 ... <div py:strip="True"><b>foo</b></div> |
| 479 ... </div>''') | |
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480 >>> print tmpl.generate() |
| 1 | 481 <div> |
| 482 <b>foo</b> | |
| 483 </div> | |
| 484 | |
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485 Leaving the attribute value empty is equivalent to a truth value. |
| 1 | 486 |
| 487 This directive is particulary interesting for named template functions or | |
| 488 match templates that do not generate a top-level element: | |
| 489 | |
| 61 | 490 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 491 ... <div py:def="echo(what)" py:strip=""> |
| 492 ... <b>${what}</b> | |
| 493 ... </div> | |
| 494 ... ${echo('foo')} | |
| 495 ... </div>''') | |
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496 >>> print tmpl.generate() |
| 1 | 497 <div> |
| 498 <b>foo</b> | |
| 499 </div> | |
| 500 """ | |
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501 __slots__ = [] |
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502 |
| 54 | 503 def __call__(self, stream, ctxt, directives): |
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504 def _generate(): |
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505 if self.expr: |
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506 strip = self.expr.evaluate(ctxt) |
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507 else: |
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508 strip = True |
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509 if strip: |
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510 stream.next() # skip start tag |
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511 previous = stream.next() |
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512 for event in stream: |
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513 yield previous |
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514 previous = event |
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515 else: |
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516 for event in stream: |
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517 yield event |
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518 |
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519 return _apply_directives(_generate(), ctxt, directives) |
| 1 | 520 |
| 521 | |
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522 class ChooseDirective(Directive): |
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523 """Implementation of the `py:choose` directive for conditionally selecting |
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524 one of several body elements to display. |
|
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525 |
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526 If the `py:choose` expression is empty the expressions of nested `py:when` |
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527 directives are tested for truth. The first true `py:when` body is output. |
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528 If no `py:when` directive is matched then the fallback directive |
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529 `py:otherwise` will be used. |
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530 |
| 61 | 531 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
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532 ... py:choose=""> |
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533 ... <span py:when="0 == 1">0</span> |
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534 ... <span py:when="1 == 1">1</span> |
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535 ... <span py:otherwise="">2</span> |
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536 ... </div>''') |
|
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537 >>> print tmpl.generate() |
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538 <div> |
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539 <span>1</span> |
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540 </div> |
|
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541 |
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542 If the `py:choose` directive contains an expression, the nested `py:when` |
|
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543 directives are tested for equality to the `py:choose` expression: |
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544 |
| 61 | 545 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
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546 ... py:choose="2"> |
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547 ... <span py:when="1">1</span> |
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548 ... <span py:when="2">2</span> |
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549 ... </div>''') |
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550 >>> print tmpl.generate() |
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551 <div> |
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552 <span>2</span> |
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553 </div> |
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554 |
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555 Behavior is undefined if a `py:choose` block contains content outside a |
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556 `py:when` or `py:otherwise` block. Behavior is also undefined if a |
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557 `py:otherwise` occurs before `py:when` blocks. |
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558 """ |
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559 __slots__ = ['matched', 'value'] |
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560 |
|
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561 ATTRIBUTE = 'test' |
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562 |
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563 def __call__(self, stream, ctxt, directives): |
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564 if self.expr: |
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565 self.value = self.expr.evaluate(ctxt) |
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566 self.matched = False |
|
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567 ctxt.push(dict(_choose=self)) |
|
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568 for event in _apply_directives(stream, ctxt, directives): |
|
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569 yield event |
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570 ctxt.pop() |
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571 |
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572 |
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573 class WhenDirective(Directive): |
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574 """Implementation of the `py:when` directive for nesting in a parent with |
|
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575 the `py:choose` directive. |
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576 |
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577 See the documentation of `py:choose` for usage. |
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578 """ |
|
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579 |
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580 ATTRIBUTE = 'test' |
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581 |
| 54 | 582 def __call__(self, stream, ctxt, directives): |
|
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583 choose = ctxt['_choose'] |
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584 if choose.matched: |
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585 return [] |
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586 value = self.expr.evaluate(ctxt) |
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587 try: |
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588 if value == choose.value: |
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589 choose.matched = True |
|
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590 return _apply_directives(stream, ctxt, directives) |
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591 except AttributeError: |
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592 if value: |
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593 choose.matched = True |
|
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594 return _apply_directives(stream, ctxt, directives) |
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595 return [] |
|
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596 |
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597 |
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598 class OtherwiseDirective(Directive): |
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599 """Implementation of the `py:otherwise` directive for nesting in a parent |
|
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600 with the `py:choose` directive. |
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601 |
|
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602 See the documentation of `py:choose` for usage. |
|
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603 """ |
| 54 | 604 def __call__(self, stream, ctxt, directives): |
|
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605 choose = ctxt['_choose'] |
|
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606 if choose.matched: |
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|
607 return [] |
|
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|
608 choose.matched = True |
|
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609 return _apply_directives(stream, ctxt, directives) |
|
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|
610 |
|
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|
611 |
|
104
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|
612 class WithDirective(Directive): |
|
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613 """Implementation of the `py:with` template directive, which allows |
|
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|
614 shorthand access to variables and expressions. |
|
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|
615 |
|
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|
616 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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617 ... <span py:with="y=7; z=x+10">$x $y $z</span> |
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618 ... </div>''') |
|
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619 >>> print tmpl.generate(x=42) |
|
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620 <div> |
|
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|
621 <span>42 7 52</span> |
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|
622 </div> |
|
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|
623 """ |
|
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|
624 __slots__ = ['vars'] |
|
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|
625 |
|
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|
626 ATTRIBUTE = 'vars' |
|
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|
627 |
|
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|
628 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
|
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629 Directive.__init__(self, None, filename, lineno, offset) |
|
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|
630 self.vars = [] |
|
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|
631 try: |
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|
632 for stmt in value.split(';'): |
|
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|
633 name, value = stmt.split('=', 1) |
|
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|
634 self.vars.append((name.strip(), |
|
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|
635 Expression(value.strip(), filename, lineno))) |
|
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|
636 except SyntaxError, err: |
|
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|
637 raise TemplateSyntaxError(err, filename, lineno, |
|
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|
638 offset + (err.offset or 0)) |
|
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|
639 |
|
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|
640 def __call__(self, stream, ctxt, directives): |
| 120 | 641 ctxt.push(dict([(name, expr.evaluate(ctxt, nocall=True)) |
|
104
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|
642 for name, expr in self.vars])) |
|
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Added `py:with` directive based on Jonas' patch in #17.
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diff
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|
643 for event in _apply_directives(stream, ctxt, directives): |
|
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Added `py:with` directive based on Jonas' patch in #17.
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|
644 yield event |
|
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Added `py:with` directive based on Jonas' patch in #17.
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|
645 ctxt.pop() |
|
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Added `py:with` directive based on Jonas' patch in #17.
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diff
changeset
|
646 |
|
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Added `py:with` directive based on Jonas' patch in #17.
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changeset
|
647 def __repr__(self): |
|
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Added `py:with` directive based on Jonas' patch in #17.
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|
648 return '<%s "%s">' % (self.__class__.__name__, |
|
e9259920db05
Added `py:with` directive based on Jonas' patch in #17.
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diff
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|
649 '; '.join(['%s = %s' % (name, expr.source) |
|
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Added `py:with` directive based on Jonas' patch in #17.
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650 for name, expr in self.vars])) |
|
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Added `py:with` directive based on Jonas' patch in #17.
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|
651 |
|
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652 |
| 1 | 653 class Template(object): |
| 654 """Can parse a template and transform it into the corresponding output | |
| 655 based on context data. | |
| 656 """ | |
| 61 | 657 NAMESPACE = Namespace('http://markup.edgewall.org/') |
| 1 | 658 |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
659 EXPR = StreamEventKind('EXPR') # an expression |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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parents:
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|
660 SUB = StreamEventKind('SUB') # a "subprogram" |
|
10
c5890ef863ba
Moved the template-specific stream event kinds into the template module.
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|
661 |
| 1 | 662 directives = [('def', DefDirective), |
| 663 ('match', MatchDirective), | |
| 120 | 664 ('when', WhenDirective), |
| 665 ('otherwise', OtherwiseDirective), | |
| 1 | 666 ('for', ForDirective), |
| 667 ('if', IfDirective), | |
|
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
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diff
changeset
|
668 ('choose', ChooseDirective), |
|
104
e9259920db05
Added `py:with` directive based on Jonas' patch in #17.
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diff
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|
669 ('with', WithDirective), |
| 1 | 670 ('replace', ReplaceDirective), |
| 671 ('content', ContentDirective), | |
| 672 ('attrs', AttrsDirective), | |
|
50
a053ffb834cb
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
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diff
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|
673 ('strip', StripDirective)] |
| 1 | 674 _dir_by_name = dict(directives) |
| 675 _dir_order = [directive[1] for directive in directives] | |
| 676 | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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diff
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|
677 def __init__(self, source, basedir=None, filename=None): |
| 1 | 678 """Initialize a template from either a string or a file-like object.""" |
| 679 if isinstance(source, basestring): | |
| 680 self.source = StringIO(source) | |
| 681 else: | |
| 682 self.source = source | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
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diff
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|
683 self.basedir = basedir |
| 1 | 684 self.filename = filename or '<string>' |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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diff
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|
685 if basedir and filename: |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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diff
changeset
|
686 self.filepath = os.path.join(basedir, filename) |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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parents:
18
diff
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|
687 else: |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
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|
688 self.filepath = '<string>' |
| 1 | 689 |
|
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
690 self.filters = [] |
| 1 | 691 self.parse() |
| 692 | |
| 693 def __repr__(self): | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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18
diff
changeset
|
694 return '<%s "%s">' % (self.__class__.__name__, self.filename) |
| 1 | 695 |
| 696 def parse(self): | |
| 697 """Parse the template. | |
| 698 | |
| 699 The parsing stage parses the XML template and constructs a list of | |
| 700 directives that will be executed in the render stage. The input is | |
| 701 split up into literal output (markup that does not depend on the | |
| 702 context data) and actual directives (commands or variable | |
| 703 substitution). | |
| 704 """ | |
| 705 stream = [] # list of events of the "compiled" template | |
| 706 dirmap = {} # temporary mapping of directives to elements | |
| 707 ns_prefix = {} | |
| 708 depth = 0 | |
| 709 | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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diff
changeset
|
710 for kind, data, pos in XMLParser(self.source, filename=self.filename): |
| 1 | 711 |
| 69 | 712 if kind is START_NS: |
| 1 | 713 # Strip out the namespace declaration for template directives |
| 714 prefix, uri = data | |
| 715 if uri == self.NAMESPACE: | |
| 716 ns_prefix[prefix] = uri | |
| 717 else: | |
| 718 stream.append((kind, data, pos)) | |
| 719 | |
| 69 | 720 elif kind is END_NS: |
| 1 | 721 if data in ns_prefix: |
| 722 del ns_prefix[data] | |
| 723 else: | |
| 724 stream.append((kind, data, pos)) | |
| 725 | |
| 69 | 726 elif kind is START: |
| 1 | 727 # Record any directive attributes in start tags |
| 728 tag, attrib = data | |
| 729 directives = [] | |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
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diff
changeset
|
730 strip = False |
|
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
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|
731 |
|
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
changeset
|
732 if tag in self.NAMESPACE: |
|
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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diff
changeset
|
733 cls = self._dir_by_name.get(tag.localname) |
|
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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diff
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|
734 if cls is None: |
|
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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diff
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|
735 raise BadDirectiveError(tag, pos[0], pos[1]) |
|
66
822089ae65ce
Switch copyright to Edgewall and URLs to markup.edgewall.org.
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parents:
65
diff
changeset
|
736 value = attrib.get(getattr(cls, 'ATTRIBUTE', None), '') |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
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parents:
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diff
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|
737 directives.append(cls(value, *pos)) |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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parents:
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diff
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|
738 strip = True |
|
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Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
changeset
|
739 |
| 1 | 740 new_attrib = [] |
| 741 for name, value in attrib: | |
|
18
4cbebb15a834
Actually make use of the `markup.core.Namespace` class, and add a couple of doctests.
cmlenz
parents:
17
diff
changeset
|
742 if name in self.NAMESPACE: |
| 1 | 743 cls = self._dir_by_name.get(name.localname) |
| 744 if cls is None: | |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
745 raise BadDirectiveError(name, pos[0], pos[1]) |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
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80
diff
changeset
|
746 directives.append(cls(value, *pos)) |
| 1 | 747 else: |
|
75
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
748 if value: |
|
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
749 value = list(self._interpolate(value, *pos)) |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
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diff
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|
750 if len(value) == 1 and value[0][0] is TEXT: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
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diff
changeset
|
751 value = value[0][1] |
|
75
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
752 else: |
|
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
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parents:
74
diff
changeset
|
753 value = [(TEXT, u'', pos)] |
| 1 | 754 new_attrib.append((name, value)) |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
755 |
| 1 | 756 if directives: |
|
50
a053ffb834cb
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
cmlenz
parents:
48
diff
changeset
|
757 directives.sort(lambda a, b: cmp(self._dir_order.index(a.__class__), |
|
a053ffb834cb
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
cmlenz
parents:
48
diff
changeset
|
758 self._dir_order.index(b.__class__))) |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
759 dirmap[(depth, tag)] = (directives, len(stream), strip) |
| 1 | 760 |
| 761 stream.append((kind, (tag, Attributes(new_attrib)), pos)) | |
| 762 depth += 1 | |
| 763 | |
| 69 | 764 elif kind is END: |
| 1 | 765 depth -= 1 |
| 766 stream.append((kind, data, pos)) | |
| 767 | |
| 768 # If there have have directive attributes with the corresponding | |
| 769 # start tag, move the events inbetween into a "subprogram" | |
| 770 if (depth, data) in dirmap: | |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
771 directives, start_offset, strip = dirmap.pop((depth, data)) |
| 1 | 772 substream = stream[start_offset:] |
|
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
773 if strip: |
|
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
774 substream = substream[1:-1] |
| 69 | 775 stream[start_offset:] = [(SUB, (directives, substream), |
| 776 pos)] | |
| 1 | 777 |
| 69 | 778 elif kind is TEXT: |
| 1 | 779 for kind, data, pos in self._interpolate(data, *pos): |
| 780 stream.append((kind, data, pos)) | |
| 781 | |
|
89
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
parents:
87
diff
changeset
|
782 elif kind is COMMENT: |
|
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
parents:
87
diff
changeset
|
783 if not data.lstrip().startswith('!'): |
|
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
parents:
87
diff
changeset
|
784 stream.append((kind, data, pos)) |
|
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
parents:
87
diff
changeset
|
785 |
| 1 | 786 else: |
| 787 stream.append((kind, data, pos)) | |
| 788 | |
| 789 self.stream = stream | |
| 790 | |
| 791 _FULL_EXPR_RE = re.compile(r'(?<!\$)\$\{(.+?)\}') | |
| 792 _SHORT_EXPR_RE = re.compile(r'(?<!\$)\$([a-zA-Z][a-zA-Z0-9_\.]*)') | |
| 793 | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
794 def _interpolate(cls, text, filename=None, lineno=-1, offset=-1): |
| 1 | 795 """Parse the given string and extract expressions. |
| 796 | |
| 797 This method returns a list containing both literal text and `Expression` | |
| 798 objects. | |
|
14
76b5d4b189e6
The `<py:match>` directive now protects itself against simple infinite recursion (see MatchDirective), while still allowing recursion in general.
cmlenz
parents:
13
diff
changeset
|
799 |
| 1 | 800 @param text: the text to parse |
| 801 @param lineno: the line number at which the text was found (optional) | |
| 802 @param offset: the column number at which the text starts in the source | |
| 803 (optional) | |
| 804 """ | |
|
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
805 def _interpolate(text, patterns, filename=filename, lineno=lineno, |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
806 offset=offset): |
| 1 | 807 for idx, group in enumerate(patterns.pop(0).split(text)): |
| 808 if idx % 2: | |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
809 try: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
810 yield EXPR, Expression(group, filename, lineno), \ |
|
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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parents:
133
diff
changeset
|
811 (filename, lineno, offset) |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
812 except SyntaxError, err: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
813 raise TemplateSyntaxError(err, filename, lineno, |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
814 offset + (err.offset or 0)) |
| 1 | 815 elif group: |
| 816 if patterns: | |
|
74
3c271699c398
Fix expression interpolation where both shorthand notation and full notation are used inside a single text node. Thanks Jonas.
cmlenz
parents:
73
diff
changeset
|
817 for result in _interpolate(group, patterns[:]): |
| 1 | 818 yield result |
| 819 else: | |
|
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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parents:
133
diff
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|
820 yield TEXT, group.replace('$$', '$'), \ |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
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133
diff
changeset
|
821 (filename, lineno, offset) |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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parents:
133
diff
changeset
|
822 if '\n' in group: |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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parents:
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diff
changeset
|
823 lines = group.splitlines() |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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parents:
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diff
changeset
|
824 lineno += len(lines) - 1 |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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parents:
133
diff
changeset
|
825 offset += len(lines[-1]) |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
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diff
changeset
|
826 else: |
|
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
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|
827 offset += len(group) |
|
74
3c271699c398
Fix expression interpolation where both shorthand notation and full notation are used inside a single text node. Thanks Jonas.
cmlenz
parents:
73
diff
changeset
|
828 return _interpolate(text, [cls._FULL_EXPR_RE, cls._SHORT_EXPR_RE]) |
| 1 | 829 _interpolate = classmethod(_interpolate) |
| 830 | |
|
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
831 def generate(self, *args, **kwargs): |
|
29
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
832 """Apply the template to the given context data. |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
833 |
|
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
834 Any keyword arguments are made available to the template as context |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
835 data. |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
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parents:
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diff
changeset
|
836 |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
837 Only one positional argument is accepted: if it is provided, it must be |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
838 an instance of the `Context` class, and keyword arguments are ignored. |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
839 This calling style is used for internal processing. |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
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diff
changeset
|
840 |
|
29
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
841 @return: a markup event stream representing the result of applying |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
842 the template to the context data. |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
843 """ |
|
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
844 if args: |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
845 assert len(args) == 1 |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
846 ctxt = args[0] |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
847 assert isinstance(ctxt, Context) |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
848 else: |
|
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
849 ctxt = Context(**kwargs) |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
850 ctxt._match_templates = [] |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
851 |
| 69 | 852 stream = self.stream |
| 853 for filter_ in [self._eval, self._match, self._flatten] + self.filters: | |
|
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
854 stream = filter_(iter(stream), ctxt) |
|
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
855 return Stream(stream) |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
856 |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
857 def _eval(self, stream, ctxt=None): |
|
29
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
858 """Internal stream filter that evaluates any expressions in `START` and |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
859 `TEXT` events. |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
860 """ |
|
111
8a4d9064f363
Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
104
diff
changeset
|
861 filters = (self._eval, self._match) |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
862 |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
863 for kind, data, pos in stream: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
864 |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
865 if kind is START and data[1]: |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
866 # Attributes may still contain expressions in start tags at |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
867 # this point, so do some evaluation |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
868 tag, attrib = data |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
869 new_attrib = [] |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
870 for name, substream in attrib: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
871 if isinstance(substream, basestring): |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
872 value = substream |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
873 else: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
874 values = [] |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
875 for subkind, subdata, subpos in substream: |
| 69 | 876 if subkind is EXPR: |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
877 values.append(subdata.evaluate(ctxt)) |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
878 else: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
879 values.append(subdata) |
|
48
06c642ba2b08
convert the result of expressions in attributes to strings so that values like ints are output correctly
mgood
parents:
44
diff
changeset
|
880 value = [unicode(x) for x in values if x is not None] |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
881 if not value: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
882 continue |
|
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
883 new_attrib.append((name, u''.join(value))) |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
884 yield kind, (tag, Attributes(new_attrib)), pos |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
885 |
| 69 | 886 elif kind is EXPR: |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
887 result = data.evaluate(ctxt) |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
888 if result is None: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
889 continue |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
890 |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
891 # First check for a string, otherwise the iterable test below |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
892 # succeeds, and the string will be chopped up into individual |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
893 # characters |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
894 if isinstance(result, basestring): |
| 69 | 895 yield TEXT, result, pos |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
896 else: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
897 # Test if the expression evaluated to an iterable, in which |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
898 # case we yield the individual items |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
899 try: |
|
111
8a4d9064f363
Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
104
diff
changeset
|
900 substream = _ensure(result) |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
901 for filter_ in filters: |
|
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
902 substream = filter_(substream, ctxt) |
|
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
903 for event in substream: |
|
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
904 yield event |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
905 except TypeError: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
906 # Neither a string nor an iterable, so just pass it |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
907 # through |
| 69 | 908 yield TEXT, unicode(result), pos |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
909 |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
910 else: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
911 yield kind, data, pos |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
912 |
|
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
913 def _flatten(self, stream, ctxt=None): |
|
29
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
914 """Internal stream filter that expands `SUB` events in the stream.""" |
|
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
915 for kind, data, pos in stream: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
916 if kind is SUB: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
917 # This event is a list of directives and a list of nested |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
918 # events to which those directives should be applied |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
919 directives, substream = data |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
920 substream = _apply_directives(substream, ctxt, directives) |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
921 for filter_ in (self._eval, self._match, self._flatten): |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
922 substream = filter_(substream, ctxt) |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
923 for event in substream: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
924 yield event |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
925 else: |
|
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
926 yield kind, data, pos |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
927 |
|
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
928 def _match(self, stream, ctxt=None, match_templates=None): |
|
29
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
929 """Internal stream filter that applies any defined match templates |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
930 to the stream. |
|
4b6cee37ce62
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
931 """ |
|
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
932 if match_templates is None: |
|
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
933 match_templates = ctxt._match_templates |
|
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
934 |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
935 for kind, data, pos in stream: |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
936 |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
937 # We (currently) only care about start and end events for matching |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
938 # We might care about namespace events in the future, though |
|
92
3b75c6730b29
More performance improvements... this time for whitespace normalization and template loops.
cmlenz
parents:
90
diff
changeset
|
939 if not match_templates or kind not in (START, END): |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
940 yield kind, data, pos |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
941 continue |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
942 |
|
50
a053ffb834cb
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
cmlenz
parents:
48
diff
changeset
|
943 for idx, (test, path, template, directives) in \ |
|
a053ffb834cb
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
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diff
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|
944 enumerate(match_templates): |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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14
diff
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|
945 |
| 116 | 946 if test(kind, data, pos) is True: |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
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diff
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|
947 # Consume and store all events until an end event |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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parents:
14
diff
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|
948 # corresponding to this start event is encountered |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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diff
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|
949 content = [(kind, data, pos)] |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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diff
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|
950 depth = 1 |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
951 while depth > 0: |
| 73 | 952 kind, data, pos = stream.next() |
| 953 if kind is START: | |
| 954 depth += 1 | |
| 955 elif kind is END: | |
| 956 depth -= 1 | |
| 957 content.append((kind, data, pos)) | |
| 958 test(kind, data, pos) | |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
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14
diff
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|
959 |
|
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
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22
diff
changeset
|
960 content = list(self._flatten(content, ctxt)) |
|
95
7d6426183a90
Improve performance of push/pop operations on the context.
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93
diff
changeset
|
961 select = lambda path: Stream(content).select(path) |
|
7d6426183a90
Improve performance of push/pop operations on the context.
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93
diff
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|
962 ctxt.push(dict(select=select)) |
|
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
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35
diff
changeset
|
963 |
|
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
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77
diff
changeset
|
964 template = _apply_directives(template, ctxt, directives) |
| 69 | 965 for event in self._match(self._eval(template, ctxt), |
| 966 ctxt, match_templates[:idx] + | |
| 967 match_templates[idx + 1:]): | |
|
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
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31
diff
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|
968 yield event |
| 116 | 969 |
|
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
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31
diff
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|
970 ctxt.pop() |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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14
diff
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|
971 break |
| 69 | 972 |
| 973 else: # no matches | |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
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14
diff
changeset
|
974 yield kind, data, pos |
|
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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14
diff
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|
975 |
| 1 | 976 |
| 69 | 977 EXPR = Template.EXPR |
| 978 SUB = Template.SUB | |
| 979 | |
| 980 | |
| 1 | 981 class TemplateLoader(object): |
| 982 """Responsible for loading templates from files on the specified search | |
| 983 path. | |
| 984 | |
| 985 >>> import tempfile | |
| 986 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template') | |
| 987 >>> os.write(fd, '<p>$var</p>') | |
| 988 11 | |
| 989 >>> os.close(fd) | |
| 990 | |
| 991 The template loader accepts a list of directory paths that are then used | |
| 992 when searching for template files, in the given order: | |
| 993 | |
| 994 >>> loader = TemplateLoader([os.path.dirname(path)]) | |
| 995 | |
| 996 The `load()` method first checks the template cache whether the requested | |
| 997 template has already been loaded. If not, it attempts to locate the | |
| 998 template file, and returns the corresponding `Template` object: | |
| 999 | |
| 1000 >>> template = loader.load(os.path.basename(path)) | |
| 1001 >>> isinstance(template, Template) | |
| 1002 True | |
| 1003 | |
| 1004 Template instances are cached: requesting a template with the same name | |
| 1005 results in the same instance being returned: | |
| 1006 | |
| 1007 >>> loader.load(os.path.basename(path)) is template | |
| 1008 True | |
| 1009 """ | |
| 1010 def __init__(self, search_path=None, auto_reload=False): | |
| 1011 """Create the template laoder. | |
| 1012 | |
| 1013 @param search_path: a list of absolute path names that should be | |
| 1014 searched for template files | |
| 1015 @param auto_reload: whether to check the last modification time of | |
| 1016 template files, and reload them if they have changed | |
| 1017 """ | |
| 1018 self.search_path = search_path | |
| 1019 if self.search_path is None: | |
| 1020 self.search_path = [] | |
| 1021 self.auto_reload = auto_reload | |
| 1022 self._cache = {} | |
| 1023 self._mtime = {} | |
| 1024 | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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18
diff
changeset
|
1025 def load(self, filename, relative_to=None): |
| 1 | 1026 """Load the template with the given name. |
| 1027 | |
|
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
changeset
|
1028 If the `filename` parameter is relative, this method searches the search |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
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|
1029 path trying to locate a template matching the given name. If the file |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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parents:
21
diff
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|
1030 name is an absolute path, the search path is not bypassed. |
| 1 | 1031 |
|
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
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|
1032 If requested template is not found, a `TemplateNotFound` exception is |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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21
diff
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|
1033 raised. Otherwise, a `Template` object is returned that represents the |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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diff
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|
1034 parsed template. |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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21
diff
changeset
|
1035 |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
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|
1036 Template instances are cached to avoid having to parse the same |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
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|
1037 template file more than once. Thus, subsequent calls of this method |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
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|
1038 with the same template file name will return the same `Template` |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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diff
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|
1039 object (unless the `auto_reload` option is enabled and the file was |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
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|
1040 changed since the last parse.) |
| 1 | 1041 |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1042 If the `relative_to` parameter is provided, the `filename` is |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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18
diff
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|
1043 interpreted as being relative to that path. |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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18
diff
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|
1044 |
| 1 | 1045 @param filename: the relative path of the template file to load |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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18
diff
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|
1046 @param relative_to: the filename of the template from which the new |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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18
diff
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|
1047 template is being loaded, or `None` if the template is being loaded |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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18
diff
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|
1048 directly |
| 1 | 1049 """ |
| 69 | 1050 from markup.filters import IncludeFilter |
| 1051 | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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parents:
18
diff
changeset
|
1052 if relative_to: |
|
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1053 filename = posixpath.join(posixpath.dirname(relative_to), filename) |
| 1 | 1054 filename = os.path.normpath(filename) |
|
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1055 |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1056 # First check the cache to avoid reparsing the same file |
| 1 | 1057 try: |
| 1058 tmpl = self._cache[filename] | |
| 1059 if not self.auto_reload or \ | |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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diff
changeset
|
1060 os.path.getmtime(tmpl.filepath) == self._mtime[filename]: |
| 1 | 1061 return tmpl |
| 1062 except KeyError: | |
| 1063 pass | |
|
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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diff
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|
1064 |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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21
diff
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|
1065 # Bypass the search path if the filename is absolute |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
1066 search_path = self.search_path |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
1067 if os.path.isabs(filename): |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
diff
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|
1068 search_path = [os.path.dirname(filename)] |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1069 |
|
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1070 for dirname in search_path: |
| 1 | 1071 filepath = os.path.join(dirname, filename) |
| 1072 try: | |
|
133
b9a0031d4bbb
Minor cleanup and performance improvement for the builder module.
cmlenz
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120
diff
changeset
|
1073 fileobj = open(filepath, 'U') |
| 1 | 1074 try: |
|
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1075 tmpl = Template(fileobj, basedir=dirname, filename=filename) |
|
17
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
1076 tmpl.filters.append(IncludeFilter(self)) |
| 1 | 1077 finally: |
| 1078 fileobj.close() | |
| 1079 self._cache[filename] = tmpl | |
| 1080 self._mtime[filename] = os.path.getmtime(filepath) | |
| 1081 return tmpl | |
| 1082 except IOError: | |
| 1083 continue | |
| 1084 raise TemplateNotFound(filename, self.search_path) |