Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/jinja2/loaders.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 jinja2.loaders
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4 ~~~~~~~~~~~~~~
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5
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6 Jinja loader classes.
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7
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8 :copyright: (c) 2010 by the Jinja Team.
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9 :license: BSD, see LICENSE for more details.
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10 """
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11 import os
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12 import sys
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13 import weakref
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14 from types import ModuleType
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15 from os import path
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16 from hashlib import sha1
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17 from jinja2.exceptions import TemplateNotFound
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18 from jinja2.utils import open_if_exists, internalcode
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19 from jinja2._compat import string_types, iteritems
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20
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21
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22 def split_template_path(template):
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23 """Split a path into segments and perform a sanity check. If it detects
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24 '..' in the path it will raise a `TemplateNotFound` error.
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25 """
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26 pieces = []
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27 for piece in template.split('/'):
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28 if path.sep in piece \
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29 or (path.altsep and path.altsep in piece) or \
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30 piece == path.pardir:
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31 raise TemplateNotFound(template)
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32 elif piece and piece != '.':
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33 pieces.append(piece)
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34 return pieces
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35
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36
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37 class BaseLoader(object):
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38 """Baseclass for all loaders. Subclass this and override `get_source` to
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39 implement a custom loading mechanism. The environment provides a
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40 `get_template` method that calls the loader's `load` method to get the
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41 :class:`Template` object.
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42
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43 A very basic example for a loader that looks up templates on the file
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44 system could look like this::
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45
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46 from jinja2 import BaseLoader, TemplateNotFound
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47 from os.path import join, exists, getmtime
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48
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49 class MyLoader(BaseLoader):
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50
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51 def __init__(self, path):
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52 self.path = path
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53
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54 def get_source(self, environment, template):
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55 path = join(self.path, template)
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56 if not exists(path):
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57 raise TemplateNotFound(template)
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58 mtime = getmtime(path)
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59 with file(path) as f:
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60 source = f.read().decode('utf-8')
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61 return source, path, lambda: mtime == getmtime(path)
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62 """
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63
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64 #: if set to `False` it indicates that the loader cannot provide access
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65 #: to the source of templates.
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66 #:
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67 #: .. versionadded:: 2.4
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68 has_source_access = True
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69
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70 def get_source(self, environment, template):
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71 """Get the template source, filename and reload helper for a template.
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72 It's passed the environment and template name and has to return a
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73 tuple in the form ``(source, filename, uptodate)`` or raise a
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74 `TemplateNotFound` error if it can't locate the template.
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75
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76 The source part of the returned tuple must be the source of the
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77 template as unicode string or a ASCII bytestring. The filename should
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78 be the name of the file on the filesystem if it was loaded from there,
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79 otherwise `None`. The filename is used by python for the tracebacks
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80 if no loader extension is used.
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81
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82 The last item in the tuple is the `uptodate` function. If auto
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83 reloading is enabled it's always called to check if the template
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84 changed. No arguments are passed so the function must store the
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85 old state somewhere (for example in a closure). If it returns `False`
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86 the template will be reloaded.
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87 """
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88 if not self.has_source_access:
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89 raise RuntimeError('%s cannot provide access to the source' %
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90 self.__class__.__name__)
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91 raise TemplateNotFound(template)
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92
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93 def list_templates(self):
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94 """Iterates over all templates. If the loader does not support that
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95 it should raise a :exc:`TypeError` which is the default behavior.
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96 """
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97 raise TypeError('this loader cannot iterate over all templates')
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98
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99 @internalcode
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100 def load(self, environment, name, globals=None):
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101 """Loads a template. This method looks up the template in the cache
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102 or loads one by calling :meth:`get_source`. Subclasses should not
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103 override this method as loaders working on collections of other
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104 loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`)
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105 will not call this method but `get_source` directly.
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106 """
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107 code = None
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108 if globals is None:
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109 globals = {}
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110
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111 # first we try to get the source for this template together
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112 # with the filename and the uptodate function.
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113 source, filename, uptodate = self.get_source(environment, name)
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114
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115 # try to load the code from the bytecode cache if there is a
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116 # bytecode cache configured.
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117 bcc = environment.bytecode_cache
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118 if bcc is not None:
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119 bucket = bcc.get_bucket(environment, name, filename, source)
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120 code = bucket.code
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121
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122 # if we don't have code so far (not cached, no longer up to
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123 # date) etc. we compile the template
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124 if code is None:
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125 code = environment.compile(source, name, filename)
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126
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127 # if the bytecode cache is available and the bucket doesn't
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128 # have a code so far, we give the bucket the new code and put
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129 # it back to the bytecode cache.
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130 if bcc is not None and bucket.code is None:
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131 bucket.code = code
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132 bcc.set_bucket(bucket)
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133
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134 return environment.template_class.from_code(environment, code,
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135 globals, uptodate)
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136
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137
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138 class FileSystemLoader(BaseLoader):
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139 """Loads templates from the file system. This loader can find templates
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140 in folders on the file system and is the preferred way to load them.
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141
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142 The loader takes the path to the templates as string, or if multiple
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143 locations are wanted a list of them which is then looked up in the
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144 given order::
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145
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146 >>> loader = FileSystemLoader('/path/to/templates')
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147 >>> loader = FileSystemLoader(['/path/to/templates', '/other/path'])
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148
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149 Per default the template encoding is ``'utf-8'`` which can be changed
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150 by setting the `encoding` parameter to something else.
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151
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152 To follow symbolic links, set the *followlinks* parameter to ``True``::
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153
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154 >>> loader = FileSystemLoader('/path/to/templates', followlinks=True)
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155
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156 .. versionchanged:: 2.8+
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157 The *followlinks* parameter was added.
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158 """
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159
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160 def __init__(self, searchpath, encoding='utf-8', followlinks=False):
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161 if isinstance(searchpath, string_types):
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162 searchpath = [searchpath]
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163 self.searchpath = list(searchpath)
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164 self.encoding = encoding
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165 self.followlinks = followlinks
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166
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167 def get_source(self, environment, template):
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168 pieces = split_template_path(template)
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169 for searchpath in self.searchpath:
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170 filename = path.join(searchpath, *pieces)
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171 f = open_if_exists(filename)
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172 if f is None:
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173 continue
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174 try:
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175 contents = f.read().decode(self.encoding)
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176 finally:
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177 f.close()
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178
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179 mtime = path.getmtime(filename)
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180
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181 def uptodate():
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182 try:
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183 return path.getmtime(filename) == mtime
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184 except OSError:
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185 return False
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186 return contents, filename, uptodate
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187 raise TemplateNotFound(template)
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188
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189 def list_templates(self):
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190 found = set()
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191 for searchpath in self.searchpath:
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192 walk_dir = os.walk(searchpath, followlinks=self.followlinks)
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193 for dirpath, dirnames, filenames in walk_dir:
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194 for filename in filenames:
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195 template = os.path.join(dirpath, filename) \
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196 [len(searchpath):].strip(os.path.sep) \
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197 .replace(os.path.sep, '/')
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198 if template[:2] == './':
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199 template = template[2:]
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200 if template not in found:
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201 found.add(template)
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202 return sorted(found)
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203
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204
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205 class PackageLoader(BaseLoader):
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206 """Load templates from python eggs or packages. It is constructed with
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207 the name of the python package and the path to the templates in that
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208 package::
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209
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210 loader = PackageLoader('mypackage', 'views')
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211
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212 If the package path is not given, ``'templates'`` is assumed.
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213
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214 Per default the template encoding is ``'utf-8'`` which can be changed
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215 by setting the `encoding` parameter to something else. Due to the nature
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216 of eggs it's only possible to reload templates if the package was loaded
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217 from the file system and not a zip file.
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218 """
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219
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220 def __init__(self, package_name, package_path='templates',
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221 encoding='utf-8'):
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222 from pkg_resources import DefaultProvider, ResourceManager, \
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223 get_provider
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224 provider = get_provider(package_name)
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225 self.encoding = encoding
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226 self.manager = ResourceManager()
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227 self.filesystem_bound = isinstance(provider, DefaultProvider)
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228 self.provider = provider
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229 self.package_path = package_path
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230
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231 def get_source(self, environment, template):
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232 pieces = split_template_path(template)
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233 p = '/'.join((self.package_path,) + tuple(pieces))
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234 if not self.provider.has_resource(p):
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235 raise TemplateNotFound(template)
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236
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237 filename = uptodate = None
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238 if self.filesystem_bound:
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239 filename = self.provider.get_resource_filename(self.manager, p)
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240 mtime = path.getmtime(filename)
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241 def uptodate():
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242 try:
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243 return path.getmtime(filename) == mtime
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244 except OSError:
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245 return False
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246
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247 source = self.provider.get_resource_string(self.manager, p)
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248 return source.decode(self.encoding), filename, uptodate
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249
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250 def list_templates(self):
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251 path = self.package_path
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252 if path[:2] == './':
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253 path = path[2:]
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254 elif path == '.':
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255 path = ''
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256 offset = len(path)
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257 results = []
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258 def _walk(path):
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259 for filename in self.provider.resource_listdir(path):
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260 fullname = path + '/' + filename
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261 if self.provider.resource_isdir(fullname):
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262 _walk(fullname)
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263 else:
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264 results.append(fullname[offset:].lstrip('/'))
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265 _walk(path)
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266 results.sort()
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267 return results
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268
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269
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270 class DictLoader(BaseLoader):
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271 """Loads a template from a python dict. It's passed a dict of unicode
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272 strings bound to template names. This loader is useful for unittesting:
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273
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274 >>> loader = DictLoader({'index.html': 'source here'})
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275
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276 Because auto reloading is rarely useful this is disabled per default.
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277 """
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278
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279 def __init__(self, mapping):
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280 self.mapping = mapping
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281
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282 def get_source(self, environment, template):
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283 if template in self.mapping:
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284 source = self.mapping[template]
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285 return source, None, lambda: source == self.mapping.get(template)
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286 raise TemplateNotFound(template)
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287
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288 def list_templates(self):
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289 return sorted(self.mapping)
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290
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291
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292 class FunctionLoader(BaseLoader):
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293 """A loader that is passed a function which does the loading. The
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294 function receives the name of the template and has to return either
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295 an unicode string with the template source, a tuple in the form ``(source,
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296 filename, uptodatefunc)`` or `None` if the template does not exist.
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297
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298 >>> def load_template(name):
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299 ... if name == 'index.html':
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300 ... return '...'
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301 ...
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302 >>> loader = FunctionLoader(load_template)
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303
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304 The `uptodatefunc` is a function that is called if autoreload is enabled
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305 and has to return `True` if the template is still up to date. For more
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306 details have a look at :meth:`BaseLoader.get_source` which has the same
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307 return value.
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308 """
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309
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310 def __init__(self, load_func):
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311 self.load_func = load_func
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312
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313 def get_source(self, environment, template):
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314 rv = self.load_func(template)
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315 if rv is None:
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316 raise TemplateNotFound(template)
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317 elif isinstance(rv, string_types):
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318 return rv, None, None
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319 return rv
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320
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321
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322 class PrefixLoader(BaseLoader):
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323 """A loader that is passed a dict of loaders where each loader is bound
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324 to a prefix. The prefix is delimited from the template by a slash per
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325 default, which can be changed by setting the `delimiter` argument to
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326 something else::
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327
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328 loader = PrefixLoader({
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329 'app1': PackageLoader('mypackage.app1'),
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330 'app2': PackageLoader('mypackage.app2')
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331 })
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332
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333 By loading ``'app1/index.html'`` the file from the app1 package is loaded,
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334 by loading ``'app2/index.html'`` the file from the second.
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335 """
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336
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337 def __init__(self, mapping, delimiter='/'):
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338 self.mapping = mapping
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339 self.delimiter = delimiter
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340
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341 def get_loader(self, template):
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342 try:
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343 prefix, name = template.split(self.delimiter, 1)
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344 loader = self.mapping[prefix]
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345 except (ValueError, KeyError):
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346 raise TemplateNotFound(template)
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347 return loader, name
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348
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349 def get_source(self, environment, template):
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350 loader, name = self.get_loader(template)
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351 try:
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352 return loader.get_source(environment, name)
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353 except TemplateNotFound:
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354 # re-raise the exception with the correct fileame here.
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355 # (the one that includes the prefix)
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356 raise TemplateNotFound(template)
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357
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358 @internalcode
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359 def load(self, environment, name, globals=None):
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360 loader, local_name = self.get_loader(name)
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361 try:
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362 return loader.load(environment, local_name, globals)
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363 except TemplateNotFound:
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364 # re-raise the exception with the correct fileame here.
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365 # (the one that includes the prefix)
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366 raise TemplateNotFound(name)
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367
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368 def list_templates(self):
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369 result = []
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370 for prefix, loader in iteritems(self.mapping):
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371 for template in loader.list_templates():
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372 result.append(prefix + self.delimiter + template)
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373 return result
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374
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375
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376 class ChoiceLoader(BaseLoader):
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377 """This loader works like the `PrefixLoader` just that no prefix is
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378 specified. If a template could not be found by one loader the next one
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379 is tried.
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380
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381 >>> loader = ChoiceLoader([
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382 ... FileSystemLoader('/path/to/user/templates'),
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383 ... FileSystemLoader('/path/to/system/templates')
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384 ... ])
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385
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386 This is useful if you want to allow users to override builtin templates
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387 from a different location.
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388 """
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389
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390 def __init__(self, loaders):
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391 self.loaders = loaders
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392
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393 def get_source(self, environment, template):
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394 for loader in self.loaders:
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395 try:
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396 return loader.get_source(environment, template)
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397 except TemplateNotFound:
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398 pass
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399 raise TemplateNotFound(template)
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400
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401 @internalcode
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402 def load(self, environment, name, globals=None):
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403 for loader in self.loaders:
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404 try:
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405 return loader.load(environment, name, globals)
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406 except TemplateNotFound:
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407 pass
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408 raise TemplateNotFound(name)
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409
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410 def list_templates(self):
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411 found = set()
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412 for loader in self.loaders:
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413 found.update(loader.list_templates())
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414 return sorted(found)
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415
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416
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417 class _TemplateModule(ModuleType):
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418 """Like a normal module but with support for weak references"""
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419
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420
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421 class ModuleLoader(BaseLoader):
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422 """This loader loads templates from precompiled templates.
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423
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424 Example usage:
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425
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426 >>> loader = ChoiceLoader([
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427 ... ModuleLoader('/path/to/compiled/templates'),
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428 ... FileSystemLoader('/path/to/templates')
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429 ... ])
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430
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431 Templates can be precompiled with :meth:`Environment.compile_templates`.
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432 """
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433
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434 has_source_access = False
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435
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436 def __init__(self, path):
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437 package_name = '_jinja2_module_templates_%x' % id(self)
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438
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439 # create a fake module that looks for the templates in the
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440 # path given.
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441 mod = _TemplateModule(package_name)
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442 if isinstance(path, string_types):
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443 path = [path]
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444 else:
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445 path = list(path)
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446 mod.__path__ = path
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447
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448 sys.modules[package_name] = weakref.proxy(mod,
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449 lambda x: sys.modules.pop(package_name, None))
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450
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451 # the only strong reference, the sys.modules entry is weak
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452 # so that the garbage collector can remove it once the
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453 # loader that created it goes out of business.
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454 self.module = mod
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455 self.package_name = package_name
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456
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457 @staticmethod
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458 def get_template_key(name):
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459 return 'tmpl_' + sha1(name.encode('utf-8')).hexdigest()
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460
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461 @staticmethod
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462 def get_module_filename(name):
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463 return ModuleLoader.get_template_key(name) + '.py'
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464
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465 @internalcode
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466 def load(self, environment, name, globals=None):
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467 key = self.get_template_key(name)
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468 module = '%s.%s' % (self.package_name, key)
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469 mod = getattr(self.module, module, None)
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470 if mod is None:
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471 try:
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472 mod = __import__(module, None, None, ['root'])
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473 except ImportError:
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474 raise TemplateNotFound(name)
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475
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476 # remove the entry from sys.modules, we only want the attribute
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477 # on the module object we have stored on the loader.
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478 sys.modules.pop(module, None)
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479
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480 return environment.template_class.from_module_dict(
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481 environment, mod.__dict__, globals)