Mercurial > genshi > genshi-test
annotate genshi/template/base.py @ 820:1837f39efd6f experimental-inline
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| author | cmlenz |
|---|---|
| date | Wed, 11 Mar 2009 17:51:06 +0000 |
| parents | 0742f421caba |
| children | eb8aa8690480 |
| rev | line source |
|---|---|
| 500 | 1 # -*- coding: utf-8 -*- |
| 2 # | |
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3 # Copyright (C) 2006-2008 Edgewall Software |
| 500 | 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 | |
| 8 # are also available at http://genshi.edgewall.org/wiki/License. | |
| 9 # | |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
| 12 # history and logs, available at http://genshi.edgewall.org/log/. | |
| 13 | |
| 14 """Basic templating functionality.""" | |
| 15 | |
| 16 try: | |
| 17 from collections import deque | |
| 18 except ImportError: | |
| 19 class deque(list): | |
| 20 def appendleft(self, x): self.insert(0, x) | |
| 21 def popleft(self): return self.pop(0) | |
| 22 import os | |
| 23 from StringIO import StringIO | |
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24 import sys |
| 500 | 25 |
| 26 from genshi.core import Attrs, Stream, StreamEventKind, START, TEXT, _ensure | |
| 27 from genshi.input import ParseError | |
| 28 | |
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29 __all__ = ['Context', 'DirectiveFactory', 'Template', 'TemplateError', |
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30 'TemplateRuntimeError', 'TemplateSyntaxError', 'BadDirectiveError'] |
| 500 | 31 __docformat__ = 'restructuredtext en' |
| 32 | |
| 33 | |
| 34 class TemplateError(Exception): | |
| 35 """Base exception class for errors related to template processing.""" | |
| 36 | |
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37 def __init__(self, message, filename=None, lineno=-1, offset=-1): |
| 500 | 38 """Create the exception. |
| 39 | |
| 40 :param message: the error message | |
| 41 :param filename: the filename of the template | |
| 42 :param lineno: the number of line in the template at which the error | |
| 43 occurred | |
| 44 :param offset: the column number at which the error occurred | |
| 45 """ | |
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46 if filename is None: |
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47 filename = '<string>' |
| 500 | 48 self.msg = message #: the error message string |
| 49 if filename != '<string>' or lineno >= 0: | |
| 50 message = '%s (%s, line %d)' % (self.msg, filename, lineno) | |
| 51 Exception.__init__(self, message) | |
| 52 self.filename = filename #: the name of the template file | |
| 53 self.lineno = lineno #: the number of the line containing the error | |
| 54 self.offset = offset #: the offset on the line | |
| 55 | |
| 56 | |
| 57 class TemplateSyntaxError(TemplateError): | |
| 58 """Exception raised when an expression in a template causes a Python syntax | |
| 59 error, or the template is not well-formed. | |
| 60 """ | |
| 61 | |
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62 def __init__(self, message, filename=None, lineno=-1, offset=-1): |
| 500 | 63 """Create the exception |
| 64 | |
| 65 :param message: the error message | |
| 66 :param filename: the filename of the template | |
| 67 :param lineno: the number of line in the template at which the error | |
| 68 occurred | |
| 69 :param offset: the column number at which the error occurred | |
| 70 """ | |
| 71 if isinstance(message, SyntaxError) and message.lineno is not None: | |
| 72 message = str(message).replace(' (line %d)' % message.lineno, '') | |
| 73 TemplateError.__init__(self, message, filename, lineno) | |
| 74 | |
| 75 | |
| 76 class BadDirectiveError(TemplateSyntaxError): | |
| 77 """Exception raised when an unknown directive is encountered when parsing | |
| 78 a template. | |
| 79 | |
| 80 An unknown directive is any attribute using the namespace for directives, | |
| 81 with a local name that doesn't match any registered directive. | |
| 82 """ | |
| 83 | |
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84 def __init__(self, name, filename=None, lineno=-1): |
| 500 | 85 """Create the exception |
| 86 | |
| 87 :param name: the name of the directive | |
| 88 :param filename: the filename of the template | |
| 89 :param lineno: the number of line in the template at which the error | |
| 90 occurred | |
| 91 """ | |
| 92 TemplateSyntaxError.__init__(self, 'bad directive "%s"' % name, | |
| 93 filename, lineno) | |
| 94 | |
| 95 | |
| 96 class TemplateRuntimeError(TemplateError): | |
| 97 """Exception raised when an the evaluation of a Python expression in a | |
| 98 template causes an error. | |
| 99 """ | |
| 100 | |
| 101 | |
| 102 class Context(object): | |
| 103 """Container for template input data. | |
| 104 | |
| 105 A context provides a stack of scopes (represented by dictionaries). | |
| 106 | |
| 107 Template directives such as loops can push a new scope on the stack with | |
| 108 data that should only be available inside the loop. When the loop | |
| 109 terminates, that scope can get popped off the stack again. | |
| 110 | |
| 111 >>> ctxt = Context(one='foo', other=1) | |
| 112 >>> ctxt.get('one') | |
| 113 'foo' | |
| 114 >>> ctxt.get('other') | |
| 115 1 | |
| 116 >>> ctxt.push(dict(one='frost')) | |
| 117 >>> ctxt.get('one') | |
| 118 'frost' | |
| 119 >>> ctxt.get('other') | |
| 120 1 | |
| 121 >>> ctxt.pop() | |
| 122 {'one': 'frost'} | |
| 123 >>> ctxt.get('one') | |
| 124 'foo' | |
| 125 """ | |
| 126 | |
| 127 def __init__(self, **data): | |
| 128 """Initialize the template context with the given keyword arguments as | |
| 129 data. | |
| 130 """ | |
| 131 self.frames = deque([data]) | |
| 132 self.pop = self.frames.popleft | |
| 133 self.push = self.frames.appendleft | |
| 134 self._match_templates = [] | |
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135 self._choice_stack = [] |
| 500 | 136 |
| 137 # Helper functions for use in expressions | |
| 138 def defined(name): | |
| 139 """Return whether a variable with the specified name exists in the | |
| 140 expression scope.""" | |
| 141 return name in self | |
| 142 def value_of(name, default=None): | |
| 143 """If a variable of the specified name is defined, return its value. | |
| 144 Otherwise, return the provided default value, or ``None``.""" | |
| 145 return self.get(name, default) | |
| 146 data.setdefault('defined', defined) | |
| 147 data.setdefault('value_of', value_of) | |
| 148 | |
| 149 def __repr__(self): | |
| 150 return repr(list(self.frames)) | |
| 151 | |
| 152 def __contains__(self, key): | |
| 153 """Return whether a variable exists in any of the scopes. | |
| 154 | |
| 155 :param key: the name of the variable | |
| 156 """ | |
| 157 return self._find(key)[1] is not None | |
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158 has_key = __contains__ |
| 500 | 159 |
| 160 def __delitem__(self, key): | |
| 161 """Remove a variable from all scopes. | |
| 162 | |
| 163 :param key: the name of the variable | |
| 164 """ | |
| 165 for frame in self.frames: | |
| 166 if key in frame: | |
| 167 del frame[key] | |
| 168 | |
| 169 def __getitem__(self, key): | |
| 170 """Get a variables's value, starting at the current scope and going | |
| 171 upward. | |
| 172 | |
| 173 :param key: the name of the variable | |
| 174 :return: the variable value | |
| 175 :raises KeyError: if the requested variable wasn't found in any scope | |
| 176 """ | |
| 177 value, frame = self._find(key) | |
| 178 if frame is None: | |
| 179 raise KeyError(key) | |
| 180 return value | |
| 181 | |
| 182 def __len__(self): | |
| 183 """Return the number of distinctly named variables in the context. | |
| 184 | |
| 185 :return: the number of variables in the context | |
| 186 """ | |
| 187 return len(self.items()) | |
| 188 | |
| 189 def __setitem__(self, key, value): | |
| 190 """Set a variable in the current scope. | |
| 191 | |
| 192 :param key: the name of the variable | |
| 193 :param value: the variable value | |
| 194 """ | |
| 195 self.frames[0][key] = value | |
| 196 | |
| 197 def _find(self, key, default=None): | |
| 198 """Retrieve a given variable's value and the frame it was found in. | |
| 199 | |
| 200 Intended primarily for internal use by directives. | |
| 201 | |
| 202 :param key: the name of the variable | |
| 203 :param default: the default value to return when the variable is not | |
| 204 found | |
| 205 """ | |
| 206 for frame in self.frames: | |
| 207 if key in frame: | |
| 208 return frame[key], frame | |
| 209 return default, None | |
| 210 | |
| 211 def get(self, key, default=None): | |
| 212 """Get a variable's value, starting at the current scope and going | |
| 213 upward. | |
| 214 | |
| 215 :param key: the name of the variable | |
| 216 :param default: the default value to return when the variable is not | |
| 217 found | |
| 218 """ | |
| 219 for frame in self.frames: | |
| 220 if key in frame: | |
| 221 return frame[key] | |
| 222 return default | |
| 223 | |
| 224 def keys(self): | |
| 225 """Return the name of all variables in the context. | |
| 226 | |
| 227 :return: a list of variable names | |
| 228 """ | |
| 229 keys = [] | |
| 230 for frame in self.frames: | |
| 231 keys += [key for key in frame if key not in keys] | |
| 232 return keys | |
| 233 | |
| 234 def items(self): | |
| 235 """Return a list of ``(name, value)`` tuples for all variables in the | |
| 236 context. | |
| 237 | |
| 238 :return: a list of variables | |
| 239 """ | |
| 240 return [(key, self.get(key)) for key in self.keys()] | |
| 241 | |
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242 def update(self, mapping): |
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243 """Update the context from the mapping provided.""" |
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244 self.frames[0].update(mapping) |
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245 |
| 500 | 246 def push(self, data): |
| 247 """Push a new scope on the stack. | |
| 248 | |
| 249 :param data: the data dictionary to push on the context stack. | |
| 250 """ | |
| 251 | |
| 252 def pop(self): | |
| 253 """Pop the top-most scope from the stack.""" | |
| 254 | |
| 255 | |
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256 def _apply_directives(stream, directives, ctxt, **vars): |
| 500 | 257 """Apply the given directives to the stream. |
| 258 | |
| 259 :param stream: the stream the directives should be applied to | |
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260 :param directives: the list of directives to apply |
| 500 | 261 :param ctxt: the `Context` |
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262 :param vars: additional variables that should be available when Python |
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263 code is executed |
| 500 | 264 :return: the stream with the given directives applied |
| 265 """ | |
| 266 if directives: | |
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267 stream = directives[0](iter(stream), directives[1:], ctxt, **vars) |
| 500 | 268 return stream |
| 269 | |
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270 def _eval_expr(expr, ctxt, **vars): |
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271 """Evaluate the given `Expression` object. |
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272 |
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273 :param expr: the expression to evaluate |
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274 :param ctxt: the `Context` |
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275 :param vars: additional variables that should be available to the |
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276 expression |
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277 :return: the result of the evaluation |
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278 """ |
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279 if vars: |
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280 ctxt.push(vars) |
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281 retval = expr.evaluate(ctxt) |
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282 if vars: |
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283 ctxt.pop() |
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284 return retval |
| 500 | 285 |
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286 def _exec_suite(suite, ctxt, **vars): |
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287 """Execute the given `Suite` object. |
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288 |
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289 :param suite: the code suite to execute |
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290 :param ctxt: the `Context` |
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291 :param vars: additional variables that should be available to the |
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292 code |
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293 """ |
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294 if vars: |
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295 ctxt.push(vars) |
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296 ctxt.push({}) |
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297 suite.execute(ctxt) |
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298 if vars: |
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299 top = ctxt.pop() |
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300 ctxt.pop() |
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301 ctxt.frames[0].update(top) |
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302 |
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303 |
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304 class DirectiveFactoryMeta(type): |
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305 """Meta class for directive factories.""" |
| 500 | 306 |
| 307 def __new__(cls, name, bases, d): | |
| 308 if 'directives' in d: | |
| 309 d['_dir_by_name'] = dict(d['directives']) | |
| 310 d['_dir_order'] = [directive[1] for directive in d['directives']] | |
| 311 | |
| 312 return type.__new__(cls, name, bases, d) | |
| 313 | |
| 314 | |
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315 class DirectiveFactory(object): |
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316 """Base for classes that provide a set of template directives. |
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317 |
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318 :since: version 0.6 |
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319 """ |
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320 __metaclass__ = DirectiveFactoryMeta |
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321 |
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322 directives = [] |
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323 """A list of `(name, cls)` tuples that define the set of directives |
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324 provided by this factory. |
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325 """ |
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326 |
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327 def compare_directives(self): |
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328 """Return a function that takes two directive classes and compares |
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329 them to determine their relative ordering. |
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330 """ |
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331 def _get_index(cls): |
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332 if cls in self._dir_order: |
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333 return self._dir_order.index(cls) |
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334 return 0 |
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335 return lambda a, b: cmp(_get_index(a[0]), _get_index(b[0])) |
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336 |
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337 def get_directive(self, name): |
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338 """Return the directive class for the given name. |
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339 |
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340 :param name: the directive name as used in the template |
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341 :return: the directive class |
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342 :see: `Directive` |
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343 """ |
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344 return self._dir_by_name.get(name) |
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345 |
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346 |
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347 class Template(DirectiveFactory): |
| 500 | 348 """Abstract template base class. |
| 349 | |
| 350 This class implements most of the template processing model, but does not | |
| 351 specify the syntax of templates. | |
| 352 """ | |
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353 |
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354 EXEC = StreamEventKind('EXEC') |
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355 """Stream event kind representing a Python code suite to execute.""" |
| 500 | 356 |
| 357 EXPR = StreamEventKind('EXPR') | |
| 358 """Stream event kind representing a Python expression.""" | |
| 359 | |
| 360 INCLUDE = StreamEventKind('INCLUDE') | |
| 361 """Stream event kind representing the inclusion of another template.""" | |
| 362 | |
| 363 SUB = StreamEventKind('SUB') | |
| 364 """Stream event kind representing a nested stream to which one or more | |
| 365 directives should be applied. | |
| 366 """ | |
| 367 | |
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368 serializer = None |
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369 _number_conv = unicode # function used to convert numbers to event data |
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370 |
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371 def __init__(self, source, filepath=None, filename=None, loader=None, |
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372 encoding=None, lookup='strict', allow_exec=True): |
| 500 | 373 """Initialize a template from either a string, a file-like object, or |
| 374 an already parsed markup stream. | |
| 375 | |
| 376 :param source: a string, file-like object, or markup stream to read the | |
| 377 template from | |
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378 :param filepath: the absolute path to the template file |
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379 :param filename: the path to the template file relative to the search |
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380 path |
| 500 | 381 :param loader: the `TemplateLoader` to use for loading included |
| 382 templates | |
| 383 :param encoding: the encoding of the `source` | |
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384 :param lookup: the variable lookup mechanism; either "strict" (the |
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385 default), "lenient", or a custom lookup class |
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386 :param allow_exec: whether Python code blocks in templates should be |
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387 allowed |
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388 |
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389 :note: Changed in 0.5: Added the `allow_exec` argument |
| 500 | 390 """ |
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391 self.filepath = filepath or filename |
| 500 | 392 self.filename = filename |
| 393 self.loader = loader | |
| 394 self.lookup = lookup | |
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395 self.allow_exec = allow_exec |
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396 self._init_filters() |
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397 self._prepared = False |
| 500 | 398 |
| 399 if isinstance(source, basestring): | |
| 400 source = StringIO(source) | |
| 401 else: | |
| 402 source = source | |
| 403 try: | |
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404 self._stream = self._parse(source, encoding) |
| 500 | 405 except ParseError, e: |
| 406 raise TemplateSyntaxError(e.msg, self.filepath, e.lineno, e.offset) | |
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407 |
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408 def __getstate__(self): |
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409 state = self.__dict__.copy() |
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410 state['filters'] = [] |
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411 return state |
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412 |
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413 def __setstate__(self, state): |
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414 self.__dict__ = state |
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415 self._init_filters() |
| 500 | 416 |
| 417 def __repr__(self): | |
| 418 return '<%s "%s">' % (self.__class__.__name__, self.filename) | |
| 419 | |
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420 def _init_filters(self): |
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421 self.filters = [self._flatten] |
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422 if self.loader: |
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423 self.filters.append(self._include) |
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424 |
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425 def _get_stream(self): |
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426 if not self._prepared: |
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427 self._stream = list(self._prepare(self._stream)) |
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428 self._prepared = True |
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429 return self._stream |
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430 stream = property(_get_stream) |
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431 |
| 500 | 432 def _parse(self, source, encoding): |
| 433 """Parse the template. | |
| 434 | |
| 435 The parsing stage parses the template and constructs a list of | |
| 436 directives that will be executed in the render stage. The input is | |
| 437 split up into literal output (text that does not depend on the context | |
| 438 data) and directives or expressions. | |
| 439 | |
| 440 :param source: a file-like object containing the XML source of the | |
| 441 template, or an XML event stream | |
| 442 :param encoding: the encoding of the `source` | |
| 443 """ | |
| 444 raise NotImplementedError | |
| 445 | |
| 446 def _prepare(self, stream): | |
| 447 """Call the `attach` method of every directive found in the template. | |
| 448 | |
| 449 :param stream: the event stream of the template | |
| 450 """ | |
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451 from genshi.template.loader import TemplateNotFound |
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452 |
| 500 | 453 for kind, data, pos in stream: |
| 454 if kind is SUB: | |
| 455 directives = [] | |
| 456 substream = data[1] | |
| 457 for cls, value, namespaces, pos in data[0]: | |
| 458 directive, substream = cls.attach(self, substream, value, | |
| 459 namespaces, pos) | |
| 460 if directive: | |
| 461 directives.append(directive) | |
| 462 substream = self._prepare(substream) | |
| 463 if directives: | |
| 464 yield kind, (directives, list(substream)), pos | |
| 465 else: | |
| 466 for event in substream: | |
| 467 yield event | |
| 468 else: | |
| 469 if kind is INCLUDE: | |
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470 href, cls, fallback = data |
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471 if isinstance(href, basestring) and \ |
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472 not getattr(self.loader, 'auto_reload', True): |
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473 # If the path to the included template is static, and |
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474 # auto-reloading is disabled on the template loader, |
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475 # the template is inlined into the stream |
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476 try: |
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477 tmpl = self.loader.load(href, relative_to=pos[0], |
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478 cls=cls or self.__class__) |
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479 for event in tmpl.stream: |
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480 yield event |
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481 except TemplateNotFound: |
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482 if fallback is None: |
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483 raise |
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484 for event in self._prepare(fallback): |
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485 yield event |
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486 continue |
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487 elif fallback: |
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488 # Otherwise the include is performed at run time |
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489 data = href, cls, list(self._prepare(fallback)) |
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490 |
| 500 | 491 yield kind, data, pos |
| 492 | |
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493 def compile(self): |
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494 """Compile the template to a Python module, and return the module |
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495 object. |
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496 """ |
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497 from imp import new_module |
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498 from genshi.template.inline import inline |
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499 |
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500 name = (self.filename or '_some_ident').replace('.', '_') |
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501 module = new_module(name) |
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502 source = u'\n'.join(list(inline(self))) |
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503 code = compile(source, self.filepath or '<string>', 'exec') |
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504 exec code in module.__dict__, module.__dict__ |
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505 return module |
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506 |
| 500 | 507 def generate(self, *args, **kwargs): |
| 508 """Apply the template to the given context data. | |
| 509 | |
| 510 Any keyword arguments are made available to the template as context | |
| 511 data. | |
| 512 | |
| 513 Only one positional argument is accepted: if it is provided, it must be | |
| 514 an instance of the `Context` class, and keyword arguments are ignored. | |
| 515 This calling style is used for internal processing. | |
| 516 | |
| 517 :return: a markup event stream representing the result of applying | |
| 518 the template to the context data. | |
| 519 """ | |
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520 vars = {} |
| 500 | 521 if args: |
| 522 assert len(args) == 1 | |
| 523 ctxt = args[0] | |
| 524 if ctxt is None: | |
| 525 ctxt = Context(**kwargs) | |
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526 else: |
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527 vars = kwargs |
| 500 | 528 assert isinstance(ctxt, Context) |
| 529 else: | |
| 530 ctxt = Context(**kwargs) | |
| 531 | |
| 532 stream = self.stream | |
| 533 for filter_ in self.filters: | |
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534 stream = filter_(iter(stream), ctxt, **vars) |
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535 return Stream(stream, self.serializer) |
| 500 | 536 |
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537 def _flatten(self, stream, ctxt, **vars): |
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538 number_conv = self._number_conv |
| 500 | 539 |
| 540 for kind, data, pos in stream: | |
| 541 | |
| 542 if kind is START and data[1]: | |
| 543 # Attributes may still contain expressions in start tags at | |
| 544 # this point, so do some evaluation | |
| 545 tag, attrs = data | |
| 546 new_attrs = [] | |
| 547 for name, substream in attrs: | |
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548 if type(substream) is list: |
| 500 | 549 values = [] |
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550 for event in self._flatten(substream, ctxt, **vars): |
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551 if event[0] is TEXT: |
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552 values.append(event[1]) |
| 500 | 553 value = [x for x in values if x is not None] |
| 554 if not value: | |
| 555 continue | |
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556 else: |
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557 value = substream |
| 500 | 558 new_attrs.append((name, u''.join(value))) |
| 559 yield kind, (tag, Attrs(new_attrs)), pos | |
| 560 | |
| 561 elif kind is EXPR: | |
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562 result = _eval_expr(data, ctxt, **vars) |
| 500 | 563 if result is not None: |
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564 # First check for a string, otherwise the iterable test |
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565 # below succeeds, and the string will be chopped up into |
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566 # individual characters |
| 500 | 567 if isinstance(result, basestring): |
| 568 yield TEXT, result, pos | |
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569 elif isinstance(result, (int, float, long)): |
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570 yield TEXT, number_conv(result), pos |
| 500 | 571 elif hasattr(result, '__iter__'): |
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572 for event in self._flatten(_ensure(result), ctxt, |
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573 **vars): |
| 500 | 574 yield event |
| 575 else: | |
| 576 yield TEXT, unicode(result), pos | |
| 577 | |
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578 elif kind is EXEC: |
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579 _exec_suite(data, ctxt, **vars) |
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580 |
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581 elif kind is SUB: |
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582 # This event is a list of directives and a list of nested |
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583 # events to which those directives should be applied |
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584 substream = _apply_directives(data[1], data[0], ctxt, **vars) |
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585 for event in self._flatten(substream, ctxt, **vars): |
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586 yield event |
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587 |
| 500 | 588 else: |
| 589 yield kind, data, pos | |
| 590 | |
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591 def _include(self, stream, ctxt, **vars): |
| 500 | 592 """Internal stream filter that performs inclusion of external |
| 593 template files. | |
| 594 """ | |
| 595 from genshi.template.loader import TemplateNotFound | |
| 596 | |
| 597 for event in stream: | |
| 598 if event[0] is INCLUDE: | |
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599 href, cls, fallback = event[1] |
| 500 | 600 if not isinstance(href, basestring): |
| 601 parts = [] | |
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602 for subkind, subdata, subpos in self._flatten(href, ctxt, |
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603 **vars): |
| 500 | 604 if subkind is TEXT: |
| 605 parts.append(subdata) | |
| 606 href = u''.join([x for x in parts if x is not None]) | |
| 607 try: | |
| 608 tmpl = self.loader.load(href, relative_to=event[2][0], | |
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609 cls=cls or self.__class__) |
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610 for event in tmpl.generate(ctxt, **vars): |
| 500 | 611 yield event |
| 612 except TemplateNotFound: | |
| 613 if fallback is None: | |
| 614 raise | |
| 615 for filter_ in self.filters: | |
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616 fallback = filter_(iter(fallback), ctxt, **vars) |
| 500 | 617 for event in fallback: |
| 618 yield event | |
| 619 else: | |
| 620 yield event | |
| 621 | |
| 622 | |
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623 EXEC = Template.EXEC |
| 500 | 624 EXPR = Template.EXPR |
| 625 INCLUDE = Template.INCLUDE | |
| 626 SUB = Template.SUB |