author | Todd Larsen <tlarsen@google.com> |
Wed, 01 Oct 2008 00:25:31 +0000 | |
changeset 219 | c949fe7cd731 |
parent 54 | 03e267d67478 |
child 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
54
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1 |
from django.template import TemplateSyntaxError, TemplateDoesNotExist, Variable |
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from django.template import Library, Node, TextNode |
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from django.template.loader import get_template, get_template_from_string, find_template_source |
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from django.conf import settings |
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from django.utils.safestring import mark_safe |
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7 |
register = Library() |
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class ExtendsError(Exception): |
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pass |
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class BlockNode(Node): |
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def __init__(self, name, nodelist, parent=None): |
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self.name, self.nodelist, self.parent = name, nodelist, parent |
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def __repr__(self): |
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return "<Block Node: %s. Contents: %r>" % (self.name, self.nodelist) |
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def render(self, context): |
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context.push() |
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# Save context in case of block.super(). |
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self.context = context |
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context['block'] = self |
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result = self.nodelist.render(context) |
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context.pop() |
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return result |
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def super(self): |
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if self.parent: |
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return mark_safe(self.parent.render(self.context)) |
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return '' |
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def add_parent(self, nodelist): |
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if self.parent: |
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self.parent.add_parent(nodelist) |
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else: |
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self.parent = BlockNode(self.name, nodelist) |
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class ExtendsNode(Node): |
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must_be_first = True |
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def __init__(self, nodelist, parent_name, parent_name_expr, template_dirs=None): |
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self.nodelist = nodelist |
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self.parent_name, self.parent_name_expr = parent_name, parent_name_expr |
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self.template_dirs = template_dirs |
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def __repr__(self): |
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if self.parent_name_expr: |
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return "<ExtendsNode: extends %s>" % self.parent_name_expr.token |
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return '<ExtendsNode: extends "%s">' % self.parent_name |
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def get_parent(self, context): |
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if self.parent_name_expr: |
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self.parent_name = self.parent_name_expr.resolve(context) |
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parent = self.parent_name |
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if not parent: |
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error_msg = "Invalid template name in 'extends' tag: %r." % parent |
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if self.parent_name_expr: |
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error_msg += " Got this from the '%s' variable." % self.parent_name_expr.token |
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raise TemplateSyntaxError, error_msg |
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if hasattr(parent, 'render'): |
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return parent # parent is a Template object |
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try: |
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source, origin = find_template_source(parent, self.template_dirs) |
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except TemplateDoesNotExist: |
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raise TemplateSyntaxError, "Template %r cannot be extended, because it doesn't exist" % parent |
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else: |
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return get_template_from_string(source, origin, parent) |
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|
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def render(self, context): |
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compiled_parent = self.get_parent(context) |
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pos = 0 |
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while isinstance(compiled_parent.nodelist[pos], TextNode): |
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pos += 1 |
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parent_is_child = isinstance(compiled_parent.nodelist[pos], ExtendsNode) |
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parent_blocks = dict([(n.name, n) for n in compiled_parent.nodelist.get_nodes_by_type(BlockNode)]) |
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for block_node in self.nodelist.get_nodes_by_type(BlockNode): |
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# Check for a BlockNode with this node's name, and replace it if found. |
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try: |
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parent_block = parent_blocks[block_node.name] |
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81 |
except KeyError: |
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# This BlockNode wasn't found in the parent template, but the |
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# parent block might be defined in the parent's *parent*, so we |
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84 |
# add this BlockNode to the parent's ExtendsNode nodelist, so |
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85 |
# it'll be checked when the parent node's render() is called. |
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86 |
if parent_is_child: |
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87 |
compiled_parent.nodelist[pos].nodelist.append(block_node) |
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88 |
else: |
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89 |
# Keep any existing parents and add a new one. Used by BlockNode. |
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90 |
parent_block.parent = block_node.parent |
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91 |
parent_block.add_parent(parent_block.nodelist) |
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92 |
parent_block.nodelist = block_node.nodelist |
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93 |
return compiled_parent.render(context) |
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94 |
|
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95 |
class ConstantIncludeNode(Node): |
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96 |
def __init__(self, template_path): |
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97 |
try: |
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98 |
t = get_template(template_path) |
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99 |
self.template = t |
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100 |
except: |
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101 |
if settings.TEMPLATE_DEBUG: |
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102 |
raise |
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103 |
self.template = None |
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104 |
|
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105 |
def render(self, context): |
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106 |
if self.template: |
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107 |
return self.template.render(context) |
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108 |
else: |
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109 |
return '' |
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110 |
|
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111 |
class IncludeNode(Node): |
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112 |
def __init__(self, template_name): |
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113 |
self.template_name = Variable(template_name) |
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114 |
|
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115 |
def render(self, context): |
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116 |
try: |
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117 |
template_name = self.template_name.resolve(context) |
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118 |
t = get_template(template_name) |
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119 |
return t.render(context) |
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120 |
except TemplateSyntaxError, e: |
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121 |
if settings.TEMPLATE_DEBUG: |
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122 |
raise |
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123 |
return '' |
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124 |
except: |
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125 |
return '' # Fail silently for invalid included templates. |
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126 |
|
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127 |
def do_block(parser, token): |
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128 |
""" |
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129 |
Define a block that can be overridden by child templates. |
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130 |
""" |
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131 |
bits = token.contents.split() |
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132 |
if len(bits) != 2: |
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133 |
raise TemplateSyntaxError, "'%s' tag takes only one argument" % bits[0] |
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134 |
block_name = bits[1] |
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135 |
# Keep track of the names of BlockNodes found in this template, so we can |
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136 |
# check for duplication. |
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137 |
try: |
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138 |
if block_name in parser.__loaded_blocks: |
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139 |
raise TemplateSyntaxError, "'%s' tag with name '%s' appears more than once" % (bits[0], block_name) |
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140 |
parser.__loaded_blocks.append(block_name) |
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141 |
except AttributeError: # parser.__loaded_blocks isn't a list yet |
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142 |
parser.__loaded_blocks = [block_name] |
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143 |
nodelist = parser.parse(('endblock', 'endblock %s' % block_name)) |
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144 |
parser.delete_first_token() |
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145 |
return BlockNode(block_name, nodelist) |
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146 |
|
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147 |
def do_extends(parser, token): |
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148 |
""" |
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149 |
Signal that this template extends a parent template. |
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150 |
|
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151 |
This tag may be used in two ways: ``{% extends "base" %}`` (with quotes) |
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152 |
uses the literal value "base" as the name of the parent template to extend, |
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153 |
or ``{% extends variable %}`` uses the value of ``variable`` as either the |
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154 |
name of the parent template to extend (if it evaluates to a string) or as |
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155 |
the parent tempate itelf (if it evaluates to a Template object). |
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156 |
""" |
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157 |
bits = token.contents.split() |
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158 |
if len(bits) != 2: |
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159 |
raise TemplateSyntaxError, "'%s' takes one argument" % bits[0] |
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160 |
parent_name, parent_name_expr = None, None |
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161 |
if bits[1][0] in ('"', "'") and bits[1][-1] == bits[1][0]: |
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162 |
parent_name = bits[1][1:-1] |
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163 |
else: |
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164 |
parent_name_expr = parser.compile_filter(bits[1]) |
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165 |
nodelist = parser.parse() |
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166 |
if nodelist.get_nodes_by_type(ExtendsNode): |
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167 |
raise TemplateSyntaxError, "'%s' cannot appear more than once in the same template" % bits[0] |
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168 |
return ExtendsNode(nodelist, parent_name, parent_name_expr) |
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169 |
|
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170 |
def do_include(parser, token): |
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171 |
""" |
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172 |
Loads a template and renders it with the current context. |
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173 |
|
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174 |
Example:: |
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175 |
|
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176 |
{% include "foo/some_include" %} |
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177 |
""" |
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178 |
bits = token.contents.split() |
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179 |
if len(bits) != 2: |
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180 |
raise TemplateSyntaxError, "%r tag takes one argument: the name of the template to be included" % bits[0] |
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181 |
path = bits[1] |
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182 |
if path[0] in ('"', "'") and path[-1] == path[0]: |
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183 |
return ConstantIncludeNode(path[1:-1]) |
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184 |
return IncludeNode(bits[1]) |
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185 |
|
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186 |
register.tag('block', do_block) |
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187 |
register.tag('extends', do_extends) |
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188 |
register.tag('include', do_include) |