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annotate genshi/template/loader.py @ 363:37e4b4bb0b53 trunk

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Parse template includes at parse time to avoid some runtime overhead.
author cmlenz
date Wed, 22 Nov 2006 15:38:38 +0000
parents 7763f7aec949
children e29a94b3ba0c 3eb30e4ece8c
rev   line source
336
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2006 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://genshi.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://genshi.edgewall.org/log/.
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13
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14 """Template loading and caching."""
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15
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16 import os
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17 try:
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18 import threading
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19 except ImportError:
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20 import dummy_threading as threading
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21
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22 from genshi.template.core import TemplateError
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23 from genshi.util import LRUCache
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24
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25 __all__ = ['TemplateLoader', 'TemplateNotFound']
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26
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27
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28 class TemplateNotFound(TemplateError):
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29 """Exception raised when a specific template file could not be found."""
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30
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31 def __init__(self, name, search_path):
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32 TemplateError.__init__(self, 'Template "%s" not found' % name)
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33 self.search_path = search_path
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34
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35
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36 class TemplateLoader(object):
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37 """Responsible for loading templates from files on the specified search
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38 path.
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39
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40 >>> import tempfile
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41 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template')
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42 >>> os.write(fd, '<p>$var</p>')
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43 11
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44 >>> os.close(fd)
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45
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46 The template loader accepts a list of directory paths that are then used
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47 when searching for template files, in the given order:
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48
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49 >>> loader = TemplateLoader([os.path.dirname(path)])
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50
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51 The `load()` method first checks the template cache whether the requested
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52 template has already been loaded. If not, it attempts to locate the
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53 template file, and returns the corresponding `Template` object:
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54
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55 >>> from genshi.template import MarkupTemplate
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56 >>> template = loader.load(os.path.basename(path))
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57 >>> isinstance(template, MarkupTemplate)
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58 True
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59
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60 Template instances are cached: requesting a template with the same name
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61 results in the same instance being returned:
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62
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63 >>> loader.load(os.path.basename(path)) is template
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64 True
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65
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66 >>> os.remove(path)
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67 """
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68 def __init__(self, search_path=None, auto_reload=False,
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69 default_encoding=None, max_cache_size=25, default_class=None):
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70 """Create the template laoder.
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71
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72 @param search_path: a list of absolute path names that should be
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73 searched for template files, or a string containing a single
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74 absolute path
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75 @param auto_reload: whether to check the last modification time of
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76 template files, and reload them if they have changed
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77 @param default_encoding: the default encoding to assume when loading
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78 templates; defaults to UTF-8
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79 @param max_cache_size: the maximum number of templates to keep in the
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80 cache
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81 @param default_class: the default `Template` subclass to use when
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82 instantiating templates
336
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83 """
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84 from genshi.template.markup import MarkupTemplate
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85
336
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86 self.search_path = search_path
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87 if self.search_path is None:
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88 self.search_path = []
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89 elif isinstance(self.search_path, basestring):
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90 self.search_path = [self.search_path]
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91 self.auto_reload = auto_reload
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92 self.default_encoding = default_encoding
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93 self.default_class = default_class or MarkupTemplate
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94 self._cache = LRUCache(max_cache_size)
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95 self._mtime = {}
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96 self._lock = threading.Lock()
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97
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98 def load(self, filename, relative_to=None, cls=None, encoding=None):
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99 """Load the template with the given name.
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100
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101 If the `filename` parameter is relative, this method searches the search
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102 path trying to locate a template matching the given name. If the file
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103 name is an absolute path, the search path is not bypassed.
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104
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105 If requested template is not found, a `TemplateNotFound` exception is
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106 raised. Otherwise, a `Template` object is returned that represents the
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107 parsed template.
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108
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109 Template instances are cached to avoid having to parse the same
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110 template file more than once. Thus, subsequent calls of this method
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111 with the same template file name will return the same `Template`
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112 object (unless the `auto_reload` option is enabled and the file was
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113 changed since the last parse.)
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114
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115 If the `relative_to` parameter is provided, the `filename` is
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116 interpreted as being relative to that path.
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117
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118 @param filename: the relative path of the template file to load
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119 @param relative_to: the filename of the template from which the new
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120 template is being loaded, or `None` if the template is being loaded
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121 directly
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122 @param cls: the class of the template object to instantiate
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123 @param encoding: the encoding of the template to load; defaults to the
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124 `default_encoding` of the loader instance
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125 """
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126 if cls is None:
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127 cls = self.default_class
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128 if encoding is None:
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129 encoding = self.default_encoding
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130 if relative_to and not os.path.isabs(relative_to):
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131 filename = os.path.join(os.path.dirname(relative_to), filename)
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132 filename = os.path.normpath(filename)
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133
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134 self._lock.acquire()
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135 try:
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136 # First check the cache to avoid reparsing the same file
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137 try:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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138 tmpl = self._cache[filename]
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139 if not self.auto_reload or \
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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140 os.path.getmtime(tmpl.filepath) == self._mtime[filename]:
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141 return tmpl
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142 except KeyError:
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143 pass
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144
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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145 search_path = self.search_path
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146 isabs = False
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147
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148 if os.path.isabs(filename):
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149 # Bypass the search path if the requested filename is absolute
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150 search_path = [os.path.dirname(filename)]
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151 isabs = True
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152
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153 elif relative_to and os.path.isabs(relative_to):
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154 # Make sure that the directory containing the including
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155 # template is on the search path
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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156 dirname = os.path.dirname(relative_to)
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parents:
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157 if dirname not in search_path:
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158 search_path = search_path + [dirname]
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159 isabs = True
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160
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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161 elif not search_path:
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162 # Uh oh, don't know where to look for the template
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163 raise TemplateError('Search path for templates not configured')
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parents:
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164
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
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165 for dirname in search_path:
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166 filepath = os.path.join(dirname, filename)
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parents:
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167 try:
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168 fileobj = open(filepath, 'U')
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parents:
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169 try:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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170 if isabs:
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171 # If the filename of either the included or the
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parents:
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172 # including template is absolute, make sure the
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parents:
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173 # included template gets an absolute path, too,
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parents:
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174 # so that nested include work properly without a
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175 # search path
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176 filename = os.path.join(dirname, filename)
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177 dirname = ''
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178 tmpl = cls(fileobj, basedir=dirname, filename=filename,
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
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179 loader=self, encoding=encoding)
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
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180 finally:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
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181 fileobj.close()
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
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182 self._cache[filename] = tmpl
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
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183 self._mtime[filename] = os.path.getmtime(filepath)
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parents:
diff changeset
184 return tmpl
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
185 except IOError:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
186 continue
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
187
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
188 raise TemplateNotFound(filename, search_path)
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
189
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
190 finally:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
191 self._lock.release()
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