Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/jinja2/loaders.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400 (2020-07-31)
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1 # -*- coding: utf-8 -*-
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2 """API and implementations for loading templates from different data
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3 sources.
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4 """
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5 import os
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6 import sys
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7 import weakref
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8 from hashlib import sha1
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9 from os import path
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10 from types import ModuleType
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11
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12 from ._compat import abc
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13 from ._compat import fspath
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14 from ._compat import iteritems
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15 from ._compat import string_types
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16 from .exceptions import TemplateNotFound
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17 from .utils import internalcode
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18 from .utils import open_if_exists
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19
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20
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21 def split_template_path(template):
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22 """Split a path into segments and perform a sanity check. If it detects
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23 '..' in the path it will raise a `TemplateNotFound` error.
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24 """
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25 pieces = []
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26 for piece in template.split("/"):
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27 if (
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28 path.sep in piece
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29 or (path.altsep and path.altsep in piece)
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30 or piece == path.pardir
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31 ):
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32 raise TemplateNotFound(template)
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33 elif piece and piece != ".":
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34 pieces.append(piece)
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35 return pieces
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36
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37
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38 class BaseLoader(object):
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39 """Baseclass for all loaders. Subclass this and override `get_source` to
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40 implement a custom loading mechanism. The environment provides a
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41 `get_template` method that calls the loader's `load` method to get the
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42 :class:`Template` object.
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43
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44 A very basic example for a loader that looks up templates on the file
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45 system could look like this::
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46
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47 from jinja2 import BaseLoader, TemplateNotFound
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48 from os.path import join, exists, getmtime
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49
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50 class MyLoader(BaseLoader):
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51
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52 def __init__(self, path):
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53 self.path = path
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54
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55 def get_source(self, environment, template):
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56 path = join(self.path, template)
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57 if not exists(path):
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58 raise TemplateNotFound(template)
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59 mtime = getmtime(path)
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60 with file(path) as f:
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61 source = f.read().decode('utf-8')
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62 return source, path, lambda: mtime == getmtime(path)
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63 """
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64
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65 #: if set to `False` it indicates that the loader cannot provide access
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66 #: to the source of templates.
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67 #:
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68 #: .. versionadded:: 2.4
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69 has_source_access = True
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70
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71 def get_source(self, environment, template):
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72 """Get the template source, filename and reload helper for a template.
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73 It's passed the environment and template name and has to return a
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74 tuple in the form ``(source, filename, uptodate)`` or raise a
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75 `TemplateNotFound` error if it can't locate the template.
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76
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77 The source part of the returned tuple must be the source of the
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78 template as unicode string or a ASCII bytestring. The filename should
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79 be the name of the file on the filesystem if it was loaded from there,
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80 otherwise `None`. The filename is used by python for the tracebacks
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81 if no loader extension is used.
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82
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83 The last item in the tuple is the `uptodate` function. If auto
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84 reloading is enabled it's always called to check if the template
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85 changed. No arguments are passed so the function must store the
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86 old state somewhere (for example in a closure). If it returns `False`
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87 the template will be reloaded.
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88 """
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89 if not self.has_source_access:
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90 raise RuntimeError(
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91 "%s cannot provide access to the source" % self.__class__.__name__
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92 )
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93 raise TemplateNotFound(template)
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94
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95 def list_templates(self):
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96 """Iterates over all templates. If the loader does not support that
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97 it should raise a :exc:`TypeError` which is the default behavior.
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98 """
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99 raise TypeError("this loader cannot iterate over all templates")
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100
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101 @internalcode
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102 def load(self, environment, name, globals=None):
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103 """Loads a template. This method looks up the template in the cache
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104 or loads one by calling :meth:`get_source`. Subclasses should not
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105 override this method as loaders working on collections of other
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106 loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`)
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107 will not call this method but `get_source` directly.
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108 """
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109 code = None
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110 if globals is None:
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111 globals = {}
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112
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113 # first we try to get the source for this template together
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114 # with the filename and the uptodate function.
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115 source, filename, uptodate = self.get_source(environment, name)
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116
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117 # try to load the code from the bytecode cache if there is a
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118 # bytecode cache configured.
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119 bcc = environment.bytecode_cache
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120 if bcc is not None:
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121 bucket = bcc.get_bucket(environment, name, filename, source)
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122 code = bucket.code
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123
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124 # if we don't have code so far (not cached, no longer up to
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125 # date) etc. we compile the template
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126 if code is None:
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127 code = environment.compile(source, name, filename)
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128
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129 # if the bytecode cache is available and the bucket doesn't
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130 # have a code so far, we give the bucket the new code and put
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131 # it back to the bytecode cache.
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132 if bcc is not None and bucket.code is None:
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133 bucket.code = code
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134 bcc.set_bucket(bucket)
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135
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136 return environment.template_class.from_code(
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137 environment, code, globals, uptodate
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138 )
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139
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140
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141 class FileSystemLoader(BaseLoader):
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142 """Loads templates from the file system. This loader can find templates
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143 in folders on the file system and is the preferred way to load them.
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144
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145 The loader takes the path to the templates as string, or if multiple
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146 locations are wanted a list of them which is then looked up in the
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147 given order::
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148
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149 >>> loader = FileSystemLoader('/path/to/templates')
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150 >>> loader = FileSystemLoader(['/path/to/templates', '/other/path'])
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151
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152 Per default the template encoding is ``'utf-8'`` which can be changed
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153 by setting the `encoding` parameter to something else.
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154
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155 To follow symbolic links, set the *followlinks* parameter to ``True``::
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156
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157 >>> loader = FileSystemLoader('/path/to/templates', followlinks=True)
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158
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159 .. versionchanged:: 2.8
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160 The ``followlinks`` parameter was added.
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161 """
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162
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163 def __init__(self, searchpath, encoding="utf-8", followlinks=False):
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164 if not isinstance(searchpath, abc.Iterable) or isinstance(
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165 searchpath, string_types
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166 ):
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167 searchpath = [searchpath]
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168
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169 # In Python 3.5, os.path.join doesn't support Path. This can be
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170 # simplified to list(searchpath) when Python 3.5 is dropped.
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171 self.searchpath = [fspath(p) for p in searchpath]
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172
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173 self.encoding = encoding
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174 self.followlinks = followlinks
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175
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176 def get_source(self, environment, template):
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177 pieces = split_template_path(template)
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178 for searchpath in self.searchpath:
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179 filename = path.join(searchpath, *pieces)
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180 f = open_if_exists(filename)
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181 if f is None:
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182 continue
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183 try:
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184 contents = f.read().decode(self.encoding)
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185 finally:
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186 f.close()
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187
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188 mtime = path.getmtime(filename)
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189
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190 def uptodate():
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191 try:
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192 return path.getmtime(filename) == mtime
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193 except OSError:
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194 return False
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195
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196 return contents, filename, uptodate
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197 raise TemplateNotFound(template)
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198
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199 def list_templates(self):
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200 found = set()
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201 for searchpath in self.searchpath:
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202 walk_dir = os.walk(searchpath, followlinks=self.followlinks)
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203 for dirpath, _, filenames in walk_dir:
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204 for filename in filenames:
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205 template = (
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206 os.path.join(dirpath, filename)[len(searchpath) :]
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207 .strip(os.path.sep)
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208 .replace(os.path.sep, "/")
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209 )
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210 if template[:2] == "./":
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211 template = template[2:]
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212 if template not in found:
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213 found.add(template)
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214 return sorted(found)
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215
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216
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217 class PackageLoader(BaseLoader):
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218 """Load templates from python eggs or packages. It is constructed with
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219 the name of the python package and the path to the templates in that
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220 package::
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221
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222 loader = PackageLoader('mypackage', 'views')
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223
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224 If the package path is not given, ``'templates'`` is assumed.
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225
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226 Per default the template encoding is ``'utf-8'`` which can be changed
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227 by setting the `encoding` parameter to something else. Due to the nature
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228 of eggs it's only possible to reload templates if the package was loaded
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229 from the file system and not a zip file.
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230 """
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231
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232 def __init__(self, package_name, package_path="templates", encoding="utf-8"):
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233 from pkg_resources import DefaultProvider
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234 from pkg_resources import get_provider
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235 from pkg_resources import ResourceManager
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236
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237 provider = get_provider(package_name)
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238 self.encoding = encoding
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239 self.manager = ResourceManager()
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240 self.filesystem_bound = isinstance(provider, DefaultProvider)
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241 self.provider = provider
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242 self.package_path = package_path
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243
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244 def get_source(self, environment, template):
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245 pieces = split_template_path(template)
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246 p = "/".join((self.package_path,) + tuple(pieces))
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247
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248 if not self.provider.has_resource(p):
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249 raise TemplateNotFound(template)
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250
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251 filename = uptodate = None
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252
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253 if self.filesystem_bound:
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254 filename = self.provider.get_resource_filename(self.manager, p)
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255 mtime = path.getmtime(filename)
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256
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257 def uptodate():
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258 try:
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259 return path.getmtime(filename) == mtime
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260 except OSError:
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261 return False
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262
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263 source = self.provider.get_resource_string(self.manager, p)
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264 return source.decode(self.encoding), filename, uptodate
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265
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266 def list_templates(self):
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267 path = self.package_path
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268
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269 if path[:2] == "./":
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270 path = path[2:]
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271 elif path == ".":
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272 path = ""
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273
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274 offset = len(path)
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275 results = []
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276
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277 def _walk(path):
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278 for filename in self.provider.resource_listdir(path):
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279 fullname = path + "/" + filename
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280
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281 if self.provider.resource_isdir(fullname):
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282 _walk(fullname)
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283 else:
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284 results.append(fullname[offset:].lstrip("/"))
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285
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286 _walk(path)
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287 results.sort()
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288 return results
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289
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290
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291 class DictLoader(BaseLoader):
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292 """Loads a template from a python dict. It's passed a dict of unicode
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293 strings bound to template names. This loader is useful for unittesting:
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294
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295 >>> loader = DictLoader({'index.html': 'source here'})
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296
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297 Because auto reloading is rarely useful this is disabled per default.
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298 """
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299
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300 def __init__(self, mapping):
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301 self.mapping = mapping
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302
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303 def get_source(self, environment, template):
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304 if template in self.mapping:
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305 source = self.mapping[template]
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306 return source, None, lambda: source == self.mapping.get(template)
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307 raise TemplateNotFound(template)
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308
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309 def list_templates(self):
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310 return sorted(self.mapping)
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311
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312
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313 class FunctionLoader(BaseLoader):
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314 """A loader that is passed a function which does the loading. The
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315 function receives the name of the template and has to return either
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316 an unicode string with the template source, a tuple in the form ``(source,
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317 filename, uptodatefunc)`` or `None` if the template does not exist.
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318
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319 >>> def load_template(name):
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320 ... if name == 'index.html':
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321 ... return '...'
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322 ...
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323 >>> loader = FunctionLoader(load_template)
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324
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325 The `uptodatefunc` is a function that is called if autoreload is enabled
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326 and has to return `True` if the template is still up to date. For more
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327 details have a look at :meth:`BaseLoader.get_source` which has the same
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328 return value.
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329 """
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330
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331 def __init__(self, load_func):
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332 self.load_func = load_func
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333
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334 def get_source(self, environment, template):
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335 rv = self.load_func(template)
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336 if rv is None:
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337 raise TemplateNotFound(template)
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338 elif isinstance(rv, string_types):
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339 return rv, None, None
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340 return rv
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341
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342
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343 class PrefixLoader(BaseLoader):
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344 """A loader that is passed a dict of loaders where each loader is bound
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345 to a prefix. The prefix is delimited from the template by a slash per
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346 default, which can be changed by setting the `delimiter` argument to
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347 something else::
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348
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349 loader = PrefixLoader({
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350 'app1': PackageLoader('mypackage.app1'),
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351 'app2': PackageLoader('mypackage.app2')
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352 })
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353
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354 By loading ``'app1/index.html'`` the file from the app1 package is loaded,
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355 by loading ``'app2/index.html'`` the file from the second.
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356 """
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357
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358 def __init__(self, mapping, delimiter="/"):
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359 self.mapping = mapping
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360 self.delimiter = delimiter
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361
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362 def get_loader(self, template):
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363 try:
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364 prefix, name = template.split(self.delimiter, 1)
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365 loader = self.mapping[prefix]
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366 except (ValueError, KeyError):
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367 raise TemplateNotFound(template)
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368 return loader, name
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369
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370 def get_source(self, environment, template):
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371 loader, name = self.get_loader(template)
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372 try:
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373 return loader.get_source(environment, name)
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374 except TemplateNotFound:
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375 # re-raise the exception with the correct filename here.
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376 # (the one that includes the prefix)
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377 raise TemplateNotFound(template)
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378
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379 @internalcode
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380 def load(self, environment, name, globals=None):
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381 loader, local_name = self.get_loader(name)
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382 try:
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383 return loader.load(environment, local_name, globals)
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384 except TemplateNotFound:
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385 # re-raise the exception with the correct filename here.
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386 # (the one that includes the prefix)
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387 raise TemplateNotFound(name)
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388
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389 def list_templates(self):
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390 result = []
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391 for prefix, loader in iteritems(self.mapping):
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392 for template in loader.list_templates():
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393 result.append(prefix + self.delimiter + template)
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394 return result
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395
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396
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397 class ChoiceLoader(BaseLoader):
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398 """This loader works like the `PrefixLoader` just that no prefix is
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399 specified. If a template could not be found by one loader the next one
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400 is tried.
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401
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402 >>> loader = ChoiceLoader([
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403 ... FileSystemLoader('/path/to/user/templates'),
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404 ... FileSystemLoader('/path/to/system/templates')
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405 ... ])
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406
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407 This is useful if you want to allow users to override builtin templates
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408 from a different location.
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409 """
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410
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411 def __init__(self, loaders):
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412 self.loaders = loaders
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413
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414 def get_source(self, environment, template):
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415 for loader in self.loaders:
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416 try:
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417 return loader.get_source(environment, template)
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418 except TemplateNotFound:
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419 pass
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420 raise TemplateNotFound(template)
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421
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422 @internalcode
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423 def load(self, environment, name, globals=None):
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424 for loader in self.loaders:
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425 try:
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426 return loader.load(environment, name, globals)
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427 except TemplateNotFound:
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428 pass
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429 raise TemplateNotFound(name)
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430
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431 def list_templates(self):
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432 found = set()
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433 for loader in self.loaders:
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434 found.update(loader.list_templates())
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435 return sorted(found)
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436
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437
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438 class _TemplateModule(ModuleType):
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439 """Like a normal module but with support for weak references"""
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440
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441
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442 class ModuleLoader(BaseLoader):
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443 """This loader loads templates from precompiled templates.
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444
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445 Example usage:
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446
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447 >>> loader = ChoiceLoader([
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448 ... ModuleLoader('/path/to/compiled/templates'),
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449 ... FileSystemLoader('/path/to/templates')
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450 ... ])
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451
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452 Templates can be precompiled with :meth:`Environment.compile_templates`.
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453 """
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454
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455 has_source_access = False
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456
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457 def __init__(self, path):
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458 package_name = "_jinja2_module_templates_%x" % id(self)
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459
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460 # create a fake module that looks for the templates in the
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461 # path given.
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462 mod = _TemplateModule(package_name)
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463
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464 if not isinstance(path, abc.Iterable) or isinstance(path, string_types):
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465 path = [path]
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466
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467 mod.__path__ = [fspath(p) for p in path]
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468
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469 sys.modules[package_name] = weakref.proxy(
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470 mod, lambda x: sys.modules.pop(package_name, None)
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471 )
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472
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473 # the only strong reference, the sys.modules entry is weak
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474 # so that the garbage collector can remove it once the
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475 # loader that created it goes out of business.
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476 self.module = mod
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477 self.package_name = package_name
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478
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479 @staticmethod
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480 def get_template_key(name):
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481 return "tmpl_" + sha1(name.encode("utf-8")).hexdigest()
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482
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483 @staticmethod
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484 def get_module_filename(name):
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485 return ModuleLoader.get_template_key(name) + ".py"
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486
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487 @internalcode
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488 def load(self, environment, name, globals=None):
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489 key = self.get_template_key(name)
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490 module = "%s.%s" % (self.package_name, key)
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491 mod = getattr(self.module, module, None)
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492 if mod is None:
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493 try:
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494 mod = __import__(module, None, None, ["root"])
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495 except ImportError:
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496 raise TemplateNotFound(name)
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497
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498 # remove the entry from sys.modules, we only want the attribute
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499 # on the module object we have stored on the loader.
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500 sys.modules.pop(module, None)
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501
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502 return environment.template_class.from_module_dict(
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503 environment, mod.__dict__, globals
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504 )