1020 lines
38 KiB
Python
1020 lines
38 KiB
Python
import imp
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import re
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from inspect import getargspec
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from django.conf import settings
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from django.template.context import Context, RequestContext, ContextPopException
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from django.utils.importlib import import_module
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from django.utils.itercompat import is_iterable
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from django.utils.functional import curry, Promise
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from django.utils.text import smart_split, unescape_string_literal, get_text_list
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from django.utils.encoding import smart_unicode, force_unicode, smart_str
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from django.utils.translation import ugettext_lazy
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from django.utils.safestring import SafeData, EscapeData, mark_safe, mark_for_escaping
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from django.utils.formats import localize
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from django.utils.html import escape
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from django.utils.module_loading import module_has_submodule
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TOKEN_TEXT = 0
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TOKEN_VAR = 1
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TOKEN_BLOCK = 2
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TOKEN_COMMENT = 3
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# template syntax constants
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FILTER_SEPARATOR = '|'
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FILTER_ARGUMENT_SEPARATOR = ':'
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VARIABLE_ATTRIBUTE_SEPARATOR = '.'
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BLOCK_TAG_START = '{%'
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BLOCK_TAG_END = '%}'
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VARIABLE_TAG_START = '{{'
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VARIABLE_TAG_END = '}}'
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COMMENT_TAG_START = '{#'
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COMMENT_TAG_END = '#}'
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TRANSLATOR_COMMENT_MARK = 'Translators'
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SINGLE_BRACE_START = '{'
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SINGLE_BRACE_END = '}'
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ALLOWED_VARIABLE_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.'
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# what to report as the origin for templates that come from non-loader sources
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# (e.g. strings)
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UNKNOWN_SOURCE = '<unknown source>'
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# match a variable or block tag and capture the entire tag, including start/end delimiters
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tag_re = re.compile('(%s.*?%s|%s.*?%s|%s.*?%s)' % (re.escape(BLOCK_TAG_START), re.escape(BLOCK_TAG_END),
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re.escape(VARIABLE_TAG_START), re.escape(VARIABLE_TAG_END),
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re.escape(COMMENT_TAG_START), re.escape(COMMENT_TAG_END)))
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# global dictionary of libraries that have been loaded using get_library
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libraries = {}
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# global list of libraries to load by default for a new parser
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builtins = []
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# True if TEMPLATE_STRING_IF_INVALID contains a format string (%s). None means
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# uninitialised.
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invalid_var_format_string = None
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class TemplateSyntaxError(Exception):
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pass
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class TemplateDoesNotExist(Exception):
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pass
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class TemplateEncodingError(Exception):
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pass
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class VariableDoesNotExist(Exception):
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def __init__(self, msg, params=()):
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self.msg = msg
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self.params = params
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def __str__(self):
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return unicode(self).encode('utf-8')
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def __unicode__(self):
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return self.msg % tuple([force_unicode(p, errors='replace') for p in self.params])
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class InvalidTemplateLibrary(Exception):
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pass
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class Origin(object):
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def __init__(self, name):
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self.name = name
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def reload(self):
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raise NotImplementedError
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def __str__(self):
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return self.name
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class StringOrigin(Origin):
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def __init__(self, source):
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super(StringOrigin, self).__init__(UNKNOWN_SOURCE)
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self.source = source
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def reload(self):
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return self.source
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class Template(object):
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def __init__(self, template_string, origin=None, name='<Unknown Template>'):
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try:
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template_string = smart_unicode(template_string)
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except UnicodeDecodeError:
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raise TemplateEncodingError("Templates can only be constructed from unicode or UTF-8 strings.")
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if settings.TEMPLATE_DEBUG and origin is None:
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origin = StringOrigin(template_string)
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self.nodelist = compile_string(template_string, origin)
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self.name = name
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def __iter__(self):
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for node in self.nodelist:
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for subnode in node:
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yield subnode
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def _render(self, context):
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return self.nodelist.render(context)
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def render(self, context):
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"Display stage -- can be called many times"
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context.render_context.push()
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try:
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return self._render(context)
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finally:
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context.render_context.pop()
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def compile_string(template_string, origin):
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"Compiles template_string into NodeList ready for rendering"
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if settings.TEMPLATE_DEBUG:
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from debug import DebugLexer, DebugParser
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lexer_class, parser_class = DebugLexer, DebugParser
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else:
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lexer_class, parser_class = Lexer, Parser
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lexer = lexer_class(template_string, origin)
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parser = parser_class(lexer.tokenize())
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return parser.parse()
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class Token(object):
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def __init__(self, token_type, contents):
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# token_type must be TOKEN_TEXT, TOKEN_VAR, TOKEN_BLOCK or TOKEN_COMMENT.
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self.token_type, self.contents = token_type, contents
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self.lineno = None
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def __str__(self):
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return '<%s token: "%s...">' % \
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({TOKEN_TEXT: 'Text', TOKEN_VAR: 'Var', TOKEN_BLOCK: 'Block', TOKEN_COMMENT: 'Comment'}[self.token_type],
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self.contents[:20].replace('\n', ''))
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def split_contents(self):
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split = []
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bits = iter(smart_split(self.contents))
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for bit in bits:
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# Handle translation-marked template pieces
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if bit.startswith('_("') or bit.startswith("_('"):
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sentinal = bit[2] + ')'
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trans_bit = [bit]
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while not bit.endswith(sentinal):
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bit = bits.next()
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trans_bit.append(bit)
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bit = ' '.join(trans_bit)
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split.append(bit)
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return split
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class Lexer(object):
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def __init__(self, template_string, origin):
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self.template_string = template_string
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self.origin = origin
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self.lineno = 1
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def tokenize(self):
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"Return a list of tokens from a given template_string."
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in_tag = False
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result = []
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for bit in tag_re.split(self.template_string):
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if bit:
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result.append(self.create_token(bit, in_tag))
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in_tag = not in_tag
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return result
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def create_token(self, token_string, in_tag):
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"""
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Convert the given token string into a new Token object and return it.
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If in_tag is True, we are processing something that matched a tag,
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otherwise it should be treated as a literal string.
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"""
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if in_tag:
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if token_string.startswith(VARIABLE_TAG_START):
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token = Token(TOKEN_VAR, token_string[len(VARIABLE_TAG_START):-len(VARIABLE_TAG_END)].strip())
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elif token_string.startswith(BLOCK_TAG_START):
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token = Token(TOKEN_BLOCK, token_string[len(BLOCK_TAG_START):-len(BLOCK_TAG_END)].strip())
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elif token_string.startswith(COMMENT_TAG_START):
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content = ''
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if token_string.find(TRANSLATOR_COMMENT_MARK):
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content = token_string[len(COMMENT_TAG_START):-len(COMMENT_TAG_END)].strip()
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token = Token(TOKEN_COMMENT, content)
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else:
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token = Token(TOKEN_TEXT, token_string)
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token.lineno = self.lineno
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self.lineno += token_string.count('\n')
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return token
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class Parser(object):
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def __init__(self, tokens):
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self.tokens = tokens
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self.tags = {}
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self.filters = {}
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for lib in builtins:
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self.add_library(lib)
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def parse(self, parse_until=None):
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if parse_until is None: parse_until = []
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nodelist = self.create_nodelist()
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while self.tokens:
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token = self.next_token()
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if token.token_type == TOKEN_TEXT:
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self.extend_nodelist(nodelist, TextNode(token.contents), token)
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elif token.token_type == TOKEN_VAR:
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if not token.contents:
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self.empty_variable(token)
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filter_expression = self.compile_filter(token.contents)
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var_node = self.create_variable_node(filter_expression)
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self.extend_nodelist(nodelist, var_node,token)
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elif token.token_type == TOKEN_BLOCK:
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if token.contents in parse_until:
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# put token back on token list so calling code knows why it terminated
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self.prepend_token(token)
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return nodelist
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try:
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command = token.contents.split()[0]
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except IndexError:
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self.empty_block_tag(token)
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# execute callback function for this tag and append resulting node
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self.enter_command(command, token)
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try:
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compile_func = self.tags[command]
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except KeyError:
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self.invalid_block_tag(token, command, parse_until)
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try:
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compiled_result = compile_func(self, token)
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except TemplateSyntaxError, e:
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if not self.compile_function_error(token, e):
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raise
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self.extend_nodelist(nodelist, compiled_result, token)
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self.exit_command()
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if parse_until:
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self.unclosed_block_tag(parse_until)
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return nodelist
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def skip_past(self, endtag):
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while self.tokens:
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token = self.next_token()
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if token.token_type == TOKEN_BLOCK and token.contents == endtag:
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return
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self.unclosed_block_tag([endtag])
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def create_variable_node(self, filter_expression):
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return VariableNode(filter_expression)
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def create_nodelist(self):
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return NodeList()
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def extend_nodelist(self, nodelist, node, token):
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if node.must_be_first and nodelist:
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try:
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if nodelist.contains_nontext:
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raise AttributeError
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except AttributeError:
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raise TemplateSyntaxError("%r must be the first tag in the template." % node)
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if isinstance(nodelist, NodeList) and not isinstance(node, TextNode):
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nodelist.contains_nontext = True
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nodelist.append(node)
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def enter_command(self, command, token):
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pass
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def exit_command(self):
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pass
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def error(self, token, msg):
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return TemplateSyntaxError(msg)
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def empty_variable(self, token):
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raise self.error(token, "Empty variable tag")
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def empty_block_tag(self, token):
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raise self.error(token, "Empty block tag")
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def invalid_block_tag(self, token, command, parse_until=None):
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if parse_until:
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raise self.error(token, "Invalid block tag: '%s', expected %s" % (command, get_text_list(["'%s'" % p for p in parse_until])))
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raise self.error(token, "Invalid block tag: '%s'" % command)
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def unclosed_block_tag(self, parse_until):
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raise self.error(None, "Unclosed tags: %s " % ', '.join(parse_until))
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def compile_function_error(self, token, e):
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pass
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def next_token(self):
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return self.tokens.pop(0)
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def prepend_token(self, token):
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self.tokens.insert(0, token)
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def delete_first_token(self):
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del self.tokens[0]
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def add_library(self, lib):
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self.tags.update(lib.tags)
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self.filters.update(lib.filters)
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def compile_filter(self, token):
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"Convenient wrapper for FilterExpression"
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return FilterExpression(token, self)
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def find_filter(self, filter_name):
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if filter_name in self.filters:
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return self.filters[filter_name]
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else:
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raise TemplateSyntaxError("Invalid filter: '%s'" % filter_name)
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class TokenParser(object):
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"""
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Subclass this and implement the top() method to parse a template line. When
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instantiating the parser, pass in the line from the Django template parser.
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The parser's "tagname" instance-variable stores the name of the tag that
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the filter was called with.
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"""
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def __init__(self, subject):
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self.subject = subject
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self.pointer = 0
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self.backout = []
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self.tagname = self.tag()
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def top(self):
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"Overload this method to do the actual parsing and return the result."
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raise NotImplementedError()
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def more(self):
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"Returns True if there is more stuff in the tag."
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return self.pointer < len(self.subject)
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def back(self):
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"Undoes the last microparser. Use this for lookahead and backtracking."
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if not len(self.backout):
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raise TemplateSyntaxError("back called without some previous parsing")
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self.pointer = self.backout.pop()
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def tag(self):
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"A microparser that just returns the next tag from the line."
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subject = self.subject
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i = self.pointer
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if i >= len(subject):
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raise TemplateSyntaxError("expected another tag, found end of string: %s" % subject)
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p = i
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while i < len(subject) and subject[i] not in (' ', '\t'):
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i += 1
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s = subject[p:i]
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while i < len(subject) and subject[i] in (' ', '\t'):
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i += 1
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self.backout.append(self.pointer)
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self.pointer = i
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return s
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def value(self):
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"A microparser that parses for a value: some string constant or variable name."
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subject = self.subject
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i = self.pointer
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def next_space_index(subject, i):
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"Increment pointer until a real space (i.e. a space not within quotes) is encountered"
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while i < len(subject) and subject[i] not in (' ', '\t'):
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if subject[i] in ('"', "'"):
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c = subject[i]
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i += 1
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while i < len(subject) and subject[i] != c:
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i += 1
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if i >= len(subject):
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raise TemplateSyntaxError("Searching for value. Unexpected end of string in column %d: %s" % (i, subject))
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i += 1
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return i
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if i >= len(subject):
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raise TemplateSyntaxError("Searching for value. Expected another value but found end of string: %s" % subject)
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if subject[i] in ('"', "'"):
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p = i
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i += 1
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while i < len(subject) and subject[i] != subject[p]:
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i += 1
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if i >= len(subject):
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raise TemplateSyntaxError("Searching for value. Unexpected end of string in column %d: %s" % (i, subject))
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i += 1
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# Continue parsing until next "real" space, so that filters are also included
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i = next_space_index(subject, i)
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res = subject[p:i]
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while i < len(subject) and subject[i] in (' ', '\t'):
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i += 1
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self.backout.append(self.pointer)
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self.pointer = i
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return res
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else:
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p = i
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i = next_space_index(subject, i)
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s = subject[p:i]
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while i < len(subject) and subject[i] in (' ', '\t'):
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i += 1
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self.backout.append(self.pointer)
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self.pointer = i
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return s
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# This only matches constant *strings* (things in quotes or marked for
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# translation). Numbers are treated as variables for implementation reasons
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# (so that they retain their type when passed to filters).
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constant_string = r"""
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(?:%(i18n_open)s%(strdq)s%(i18n_close)s|
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%(i18n_open)s%(strsq)s%(i18n_close)s|
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%(strdq)s|
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%(strsq)s)
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""" % {
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'strdq': r'"[^"\\]*(?:\\.[^"\\]*)*"', # double-quoted string
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'strsq': r"'[^'\\]*(?:\\.[^'\\]*)*'", # single-quoted string
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'i18n_open' : re.escape("_("),
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'i18n_close' : re.escape(")"),
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}
|
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constant_string = constant_string.replace("\n", "")
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|
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filter_raw_string = r"""
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^(?P<constant>%(constant)s)|
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^(?P<var>[%(var_chars)s]+|%(num)s)|
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(?:%(filter_sep)s
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(?P<filter_name>\w+)
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(?:%(arg_sep)s
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(?:
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(?P<constant_arg>%(constant)s)|
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(?P<var_arg>[%(var_chars)s]+|%(num)s)
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)
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)?
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)""" % {
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'constant': constant_string,
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'num': r'[-+\.]?\d[\d\.e]*',
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'var_chars': "\w\." ,
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'filter_sep': re.escape(FILTER_SEPARATOR),
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'arg_sep': re.escape(FILTER_ARGUMENT_SEPARATOR),
|
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}
|
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|
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filter_re = re.compile(filter_raw_string, re.UNICODE|re.VERBOSE)
|
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|
|
class FilterExpression(object):
|
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r"""
|
|
Parses a variable token and its optional filters (all as a single string),
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and return a list of tuples of the filter name and arguments.
|
|
Sample:
|
|
>>> token = 'variable|default:"Default value"|date:"Y-m-d"'
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>>> p = Parser('')
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>>> fe = FilterExpression(token, p)
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>>> len(fe.filters)
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2
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>>> fe.var
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<Variable: 'variable'>
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|
|
This class should never be instantiated outside of the
|
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get_filters_from_token helper function.
|
|
"""
|
|
def __init__(self, token, parser):
|
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self.token = token
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matches = filter_re.finditer(token)
|
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var_obj = None
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filters = []
|
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upto = 0
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for match in matches:
|
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start = match.start()
|
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if upto != start:
|
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raise TemplateSyntaxError("Could not parse some characters: %s|%s|%s" % \
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(token[:upto], token[upto:start], token[start:]))
|
|
if var_obj is None:
|
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var, constant = match.group("var", "constant")
|
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if constant:
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try:
|
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var_obj = Variable(constant).resolve({})
|
|
except VariableDoesNotExist:
|
|
var_obj = None
|
|
elif var is None:
|
|
raise TemplateSyntaxError("Could not find variable at start of %s." % token)
|
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else:
|
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var_obj = Variable(var)
|
|
else:
|
|
filter_name = match.group("filter_name")
|
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args = []
|
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constant_arg, var_arg = match.group("constant_arg", "var_arg")
|
|
if constant_arg:
|
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args.append((False, Variable(constant_arg).resolve({})))
|
|
elif var_arg:
|
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args.append((True, Variable(var_arg)))
|
|
filter_func = parser.find_filter(filter_name)
|
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self.args_check(filter_name, filter_func, args)
|
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filters.append((filter_func, args))
|
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upto = match.end()
|
|
if upto != len(token):
|
|
raise TemplateSyntaxError("Could not parse the remainder: '%s' from '%s'" % (token[upto:], token))
|
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|
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self.filters = filters
|
|
self.var = var_obj
|
|
|
|
def resolve(self, context, ignore_failures=False):
|
|
if isinstance(self.var, Variable):
|
|
try:
|
|
obj = self.var.resolve(context)
|
|
except VariableDoesNotExist:
|
|
if ignore_failures:
|
|
obj = None
|
|
else:
|
|
if settings.TEMPLATE_STRING_IF_INVALID:
|
|
global invalid_var_format_string
|
|
if invalid_var_format_string is None:
|
|
invalid_var_format_string = '%s' in settings.TEMPLATE_STRING_IF_INVALID
|
|
if invalid_var_format_string:
|
|
return settings.TEMPLATE_STRING_IF_INVALID % self.var
|
|
return settings.TEMPLATE_STRING_IF_INVALID
|
|
else:
|
|
obj = settings.TEMPLATE_STRING_IF_INVALID
|
|
else:
|
|
obj = self.var
|
|
for func, args in self.filters:
|
|
arg_vals = []
|
|
for lookup, arg in args:
|
|
if not lookup:
|
|
arg_vals.append(mark_safe(arg))
|
|
else:
|
|
arg_vals.append(arg.resolve(context))
|
|
if getattr(func, 'needs_autoescape', False):
|
|
new_obj = func(obj, autoescape=context.autoescape, *arg_vals)
|
|
else:
|
|
new_obj = func(obj, *arg_vals)
|
|
if getattr(func, 'is_safe', False) and isinstance(obj, SafeData):
|
|
obj = mark_safe(new_obj)
|
|
elif isinstance(obj, EscapeData):
|
|
obj = mark_for_escaping(new_obj)
|
|
else:
|
|
obj = new_obj
|
|
return obj
|
|
|
|
def args_check(name, func, provided):
|
|
provided = list(provided)
|
|
plen = len(provided)
|
|
# Check to see if a decorator is providing the real function.
|
|
func = getattr(func, '_decorated_function', func)
|
|
args, varargs, varkw, defaults = getargspec(func)
|
|
# First argument is filter input.
|
|
args.pop(0)
|
|
if defaults:
|
|
nondefs = args[:-len(defaults)]
|
|
else:
|
|
nondefs = args
|
|
# Args without defaults must be provided.
|
|
try:
|
|
for arg in nondefs:
|
|
provided.pop(0)
|
|
except IndexError:
|
|
# Not enough
|
|
raise TemplateSyntaxError("%s requires %d arguments, %d provided" % (name, len(nondefs), plen))
|
|
|
|
# Defaults can be overridden.
|
|
defaults = defaults and list(defaults) or []
|
|
try:
|
|
for parg in provided:
|
|
defaults.pop(0)
|
|
except IndexError:
|
|
# Too many.
|
|
raise TemplateSyntaxError("%s requires %d arguments, %d provided" % (name, len(nondefs), plen))
|
|
|
|
return True
|
|
args_check = staticmethod(args_check)
|
|
|
|
def __str__(self):
|
|
return self.token
|
|
|
|
def resolve_variable(path, context):
|
|
"""
|
|
Returns the resolved variable, which may contain attribute syntax, within
|
|
the given context.
|
|
|
|
Deprecated; use the Variable class instead.
|
|
"""
|
|
return Variable(path).resolve(context)
|
|
|
|
class Variable(object):
|
|
r"""
|
|
A template variable, resolvable against a given context. The variable may be
|
|
a hard-coded string (if it begins and ends with single or double quote
|
|
marks)::
|
|
|
|
>>> c = {'article': {'section':u'News'}}
|
|
>>> Variable('article.section').resolve(c)
|
|
u'News'
|
|
>>> Variable('article').resolve(c)
|
|
{'section': u'News'}
|
|
>>> class AClass: pass
|
|
>>> c = AClass()
|
|
>>> c.article = AClass()
|
|
>>> c.article.section = u'News'
|
|
|
|
(The example assumes VARIABLE_ATTRIBUTE_SEPARATOR is '.')
|
|
"""
|
|
|
|
def __init__(self, var):
|
|
self.var = var
|
|
self.literal = None
|
|
self.lookups = None
|
|
self.translate = False
|
|
|
|
try:
|
|
# First try to treat this variable as a number.
|
|
#
|
|
# Note that this could cause an OverflowError here that we're not
|
|
# catching. Since this should only happen at compile time, that's
|
|
# probably OK.
|
|
self.literal = float(var)
|
|
|
|
# So it's a float... is it an int? If the original value contained a
|
|
# dot or an "e" then it was a float, not an int.
|
|
if '.' not in var and 'e' not in var.lower():
|
|
self.literal = int(self.literal)
|
|
|
|
# "2." is invalid
|
|
if var.endswith('.'):
|
|
raise ValueError
|
|
|
|
except ValueError:
|
|
# A ValueError means that the variable isn't a number.
|
|
if var.startswith('_(') and var.endswith(')'):
|
|
# The result of the lookup should be translated at rendering
|
|
# time.
|
|
self.translate = True
|
|
var = var[2:-1]
|
|
# If it's wrapped with quotes (single or double), then
|
|
# we're also dealing with a literal.
|
|
try:
|
|
self.literal = mark_safe(unescape_string_literal(var))
|
|
except ValueError:
|
|
# Otherwise we'll set self.lookups so that resolve() knows we're
|
|
# dealing with a bonafide variable
|
|
if var.find(VARIABLE_ATTRIBUTE_SEPARATOR + '_') > -1 or var[0] == '_':
|
|
raise TemplateSyntaxError("Variables and attributes may not begin with underscores: '%s'" % var)
|
|
self.lookups = tuple(var.split(VARIABLE_ATTRIBUTE_SEPARATOR))
|
|
|
|
def resolve(self, context):
|
|
"""Resolve this variable against a given context."""
|
|
if self.lookups is not None:
|
|
# We're dealing with a variable that needs to be resolved
|
|
value = self._resolve_lookup(context)
|
|
else:
|
|
# We're dealing with a literal, so it's already been "resolved"
|
|
value = self.literal
|
|
if self.translate:
|
|
return ugettext_lazy(value)
|
|
return value
|
|
|
|
def __repr__(self):
|
|
return "<%s: %r>" % (self.__class__.__name__, self.var)
|
|
|
|
def __str__(self):
|
|
return self.var
|
|
|
|
def _resolve_lookup(self, context):
|
|
"""
|
|
Performs resolution of a real variable (i.e. not a literal) against the
|
|
given context.
|
|
|
|
As indicated by the method's name, this method is an implementation
|
|
detail and shouldn't be called by external code. Use Variable.resolve()
|
|
instead.
|
|
"""
|
|
current = context
|
|
try: # catch-all for silent variable failures
|
|
for bit in self.lookups:
|
|
try: # dictionary lookup
|
|
current = current[bit]
|
|
except (TypeError, AttributeError, KeyError):
|
|
try: # attribute lookup
|
|
current = getattr(current, bit)
|
|
except (TypeError, AttributeError):
|
|
try: # list-index lookup
|
|
current = current[int(bit)]
|
|
except (IndexError, # list index out of range
|
|
ValueError, # invalid literal for int()
|
|
KeyError, # current is a dict without `int(bit)` key
|
|
TypeError, # unsubscriptable object
|
|
):
|
|
raise VariableDoesNotExist("Failed lookup for key [%s] in %r", (bit, current)) # missing attribute
|
|
if callable(current):
|
|
if getattr(current, 'alters_data', False):
|
|
current = settings.TEMPLATE_STRING_IF_INVALID
|
|
else:
|
|
try: # method call (assuming no args required)
|
|
current = current()
|
|
except TypeError: # arguments *were* required
|
|
# GOTCHA: This will also catch any TypeError
|
|
# raised in the function itself.
|
|
current = settings.TEMPLATE_STRING_IF_INVALID # invalid method call
|
|
except Exception, e:
|
|
if getattr(e, 'silent_variable_failure', False):
|
|
current = settings.TEMPLATE_STRING_IF_INVALID
|
|
else:
|
|
raise
|
|
|
|
return current
|
|
|
|
class Node(object):
|
|
# Set this to True for nodes that must be first in the template (although
|
|
# they can be preceded by text nodes.
|
|
must_be_first = False
|
|
child_nodelists = ('nodelist',)
|
|
|
|
def render(self, context):
|
|
"Return the node rendered as a string"
|
|
pass
|
|
|
|
def __iter__(self):
|
|
yield self
|
|
|
|
def get_nodes_by_type(self, nodetype):
|
|
"Return a list of all nodes (within this node and its nodelist) of the given type"
|
|
nodes = []
|
|
if isinstance(self, nodetype):
|
|
nodes.append(self)
|
|
for attr in self.child_nodelists:
|
|
nodelist = getattr(self, attr, None)
|
|
if nodelist:
|
|
nodes.extend(nodelist.get_nodes_by_type(nodetype))
|
|
return nodes
|
|
|
|
class NodeList(list):
|
|
# Set to True the first time a non-TextNode is inserted by
|
|
# extend_nodelist().
|
|
contains_nontext = False
|
|
|
|
def render(self, context):
|
|
bits = []
|
|
for node in self:
|
|
if isinstance(node, Node):
|
|
bits.append(self.render_node(node, context))
|
|
else:
|
|
bits.append(node)
|
|
return mark_safe(''.join([force_unicode(b) for b in bits]))
|
|
|
|
def get_nodes_by_type(self, nodetype):
|
|
"Return a list of all nodes of the given type"
|
|
nodes = []
|
|
for node in self:
|
|
nodes.extend(node.get_nodes_by_type(nodetype))
|
|
return nodes
|
|
|
|
def render_node(self, node, context):
|
|
return node.render(context)
|
|
|
|
class TextNode(Node):
|
|
def __init__(self, s):
|
|
self.s = s
|
|
|
|
def __repr__(self):
|
|
return "<Text Node: '%s'>" % smart_str(self.s[:25], 'ascii',
|
|
errors='replace')
|
|
|
|
def render(self, context):
|
|
return self.s
|
|
|
|
def _render_value_in_context(value, context):
|
|
"""
|
|
Converts any value to a string to become part of a rendered template. This
|
|
means escaping, if required, and conversion to a unicode object. If value
|
|
is a string, it is expected to have already been translated.
|
|
"""
|
|
value = localize(value, use_l10n=context.use_l10n)
|
|
value = force_unicode(value)
|
|
if (context.autoescape and not isinstance(value, SafeData)) or isinstance(value, EscapeData):
|
|
return escape(value)
|
|
else:
|
|
return value
|
|
|
|
class VariableNode(Node):
|
|
def __init__(self, filter_expression):
|
|
self.filter_expression = filter_expression
|
|
|
|
def __repr__(self):
|
|
return "<Variable Node: %s>" % self.filter_expression
|
|
|
|
def render(self, context):
|
|
try:
|
|
output = self.filter_expression.resolve(context)
|
|
except UnicodeDecodeError:
|
|
# Unicode conversion can fail sometimes for reasons out of our
|
|
# control (e.g. exception rendering). In that case, we fail quietly.
|
|
return ''
|
|
return _render_value_in_context(output, context)
|
|
|
|
def generic_tag_compiler(params, defaults, name, node_class, parser, token):
|
|
"Returns a template.Node subclass."
|
|
bits = token.split_contents()[1:]
|
|
bmax = len(params)
|
|
def_len = defaults and len(defaults) or 0
|
|
bmin = bmax - def_len
|
|
if(len(bits) < bmin or len(bits) > bmax):
|
|
if bmin == bmax:
|
|
message = "%s takes %s arguments" % (name, bmin)
|
|
else:
|
|
message = "%s takes between %s and %s arguments" % (name, bmin, bmax)
|
|
raise TemplateSyntaxError(message)
|
|
return node_class(bits)
|
|
|
|
class Library(object):
|
|
def __init__(self):
|
|
self.filters = {}
|
|
self.tags = {}
|
|
|
|
def tag(self, name=None, compile_function=None):
|
|
if name == None and compile_function == None:
|
|
# @register.tag()
|
|
return self.tag_function
|
|
elif name != None and compile_function == None:
|
|
if(callable(name)):
|
|
# @register.tag
|
|
return self.tag_function(name)
|
|
else:
|
|
# @register.tag('somename') or @register.tag(name='somename')
|
|
def dec(func):
|
|
return self.tag(name, func)
|
|
return dec
|
|
elif name != None and compile_function != None:
|
|
# register.tag('somename', somefunc)
|
|
self.tags[name] = compile_function
|
|
return compile_function
|
|
else:
|
|
raise InvalidTemplateLibrary("Unsupported arguments to Library.tag: (%r, %r)", (name, compile_function))
|
|
|
|
def tag_function(self,func):
|
|
self.tags[getattr(func, "_decorated_function", func).__name__] = func
|
|
return func
|
|
|
|
def filter(self, name=None, filter_func=None):
|
|
if name == None and filter_func == None:
|
|
# @register.filter()
|
|
return self.filter_function
|
|
elif filter_func == None:
|
|
if(callable(name)):
|
|
# @register.filter
|
|
return self.filter_function(name)
|
|
else:
|
|
# @register.filter('somename') or @register.filter(name='somename')
|
|
def dec(func):
|
|
return self.filter(name, func)
|
|
return dec
|
|
elif name != None and filter_func != None:
|
|
# register.filter('somename', somefunc)
|
|
self.filters[name] = filter_func
|
|
return filter_func
|
|
else:
|
|
raise InvalidTemplateLibrary("Unsupported arguments to Library.filter: (%r, %r)", (name, filter_func))
|
|
|
|
def filter_function(self, func):
|
|
self.filters[getattr(func, "_decorated_function", func).__name__] = func
|
|
return func
|
|
|
|
def simple_tag(self, func=None, takes_context=None):
|
|
def dec(func):
|
|
params, xx, xxx, defaults = getargspec(func)
|
|
if takes_context:
|
|
if params[0] == 'context':
|
|
params = params[1:]
|
|
else:
|
|
raise TemplateSyntaxError("Any tag function decorated with takes_context=True must have a first argument of 'context'")
|
|
|
|
class SimpleNode(Node):
|
|
def __init__(self, vars_to_resolve):
|
|
self.vars_to_resolve = map(Variable, vars_to_resolve)
|
|
|
|
def render(self, context):
|
|
resolved_vars = [var.resolve(context) for var in self.vars_to_resolve]
|
|
if takes_context:
|
|
func_args = [context] + resolved_vars
|
|
else:
|
|
func_args = resolved_vars
|
|
return func(*func_args)
|
|
|
|
compile_func = curry(generic_tag_compiler, params, defaults, getattr(func, "_decorated_function", func).__name__, SimpleNode)
|
|
compile_func.__doc__ = func.__doc__
|
|
self.tag(getattr(func, "_decorated_function", func).__name__, compile_func)
|
|
return func
|
|
|
|
if func is None:
|
|
# @register.simple_tag(...)
|
|
return dec
|
|
elif callable(func):
|
|
# @register.simple_tag
|
|
return dec(func)
|
|
else:
|
|
raise TemplateSyntaxError("Invalid arguments provided to simple_tag")
|
|
|
|
def inclusion_tag(self, file_name, context_class=Context, takes_context=False):
|
|
def dec(func):
|
|
params, xx, xxx, defaults = getargspec(func)
|
|
if takes_context:
|
|
if params[0] == 'context':
|
|
params = params[1:]
|
|
else:
|
|
raise TemplateSyntaxError("Any tag function decorated with takes_context=True must have a first argument of 'context'")
|
|
|
|
class InclusionNode(Node):
|
|
def __init__(self, vars_to_resolve):
|
|
self.vars_to_resolve = map(Variable, vars_to_resolve)
|
|
|
|
def render(self, context):
|
|
resolved_vars = [var.resolve(context) for var in self.vars_to_resolve]
|
|
if takes_context:
|
|
args = [context] + resolved_vars
|
|
else:
|
|
args = resolved_vars
|
|
|
|
dict = func(*args)
|
|
|
|
if not getattr(self, 'nodelist', False):
|
|
from django.template.loader import get_template, select_template
|
|
if not isinstance(file_name, basestring) and is_iterable(file_name):
|
|
t = select_template(file_name)
|
|
else:
|
|
t = get_template(file_name)
|
|
self.nodelist = t.nodelist
|
|
new_context = context_class(dict, autoescape=context.autoescape)
|
|
# Copy across the CSRF token, if present, because inclusion
|
|
# tags are often used for forms, and we need instructions
|
|
# for using CSRF protection to be as simple as possible.
|
|
csrf_token = context.get('csrf_token', None)
|
|
if csrf_token is not None:
|
|
new_context['csrf_token'] = csrf_token
|
|
return self.nodelist.render(new_context)
|
|
|
|
compile_func = curry(generic_tag_compiler, params, defaults, getattr(func, "_decorated_function", func).__name__, InclusionNode)
|
|
compile_func.__doc__ = func.__doc__
|
|
self.tag(getattr(func, "_decorated_function", func).__name__, compile_func)
|
|
return func
|
|
return dec
|
|
|
|
def import_library(taglib_module):
|
|
"""Load a template tag library module.
|
|
|
|
Verifies that the library contains a 'register' attribute, and
|
|
returns that attribute as the representation of the library
|
|
"""
|
|
app_path, taglib = taglib_module.rsplit('.',1)
|
|
app_module = import_module(app_path)
|
|
try:
|
|
mod = import_module(taglib_module)
|
|
except ImportError, e:
|
|
# If the ImportError is because the taglib submodule does not exist, that's not
|
|
# an error that should be raised. If the submodule exists and raised an ImportError
|
|
# on the attempt to load it, that we want to raise.
|
|
if not module_has_submodule(app_module, taglib):
|
|
return None
|
|
else:
|
|
raise InvalidTemplateLibrary("ImportError raised loading %s: %s" % (taglib_module, e))
|
|
try:
|
|
return mod.register
|
|
except AttributeError:
|
|
raise InvalidTemplateLibrary("Template library %s does not have a variable named 'register'" % taglib_module)
|
|
|
|
templatetags_modules = []
|
|
|
|
def get_templatetags_modules():
|
|
"""Return the list of all available template tag modules.
|
|
|
|
Caches the result for faster access.
|
|
"""
|
|
global templatetags_modules
|
|
if not templatetags_modules:
|
|
_templatetags_modules = []
|
|
# Populate list once per thread.
|
|
for app_module in ['django'] + list(settings.INSTALLED_APPS):
|
|
try:
|
|
templatetag_module = '%s.templatetags' % app_module
|
|
import_module(templatetag_module)
|
|
_templatetags_modules.append(templatetag_module)
|
|
except ImportError:
|
|
continue
|
|
templatetags_modules = _templatetags_modules
|
|
return templatetags_modules
|
|
|
|
def get_library(library_name):
|
|
"""
|
|
Load the template library module with the given name.
|
|
|
|
If library is not already loaded loop over all templatetags modules to locate it.
|
|
|
|
{% load somelib %} and {% load someotherlib %} loops twice.
|
|
|
|
Subsequent loads eg. {% load somelib %} in the same process will grab the cached
|
|
module from libraries.
|
|
"""
|
|
lib = libraries.get(library_name, None)
|
|
if not lib:
|
|
templatetags_modules = get_templatetags_modules()
|
|
tried_modules = []
|
|
for module in templatetags_modules:
|
|
taglib_module = '%s.%s' % (module, library_name)
|
|
tried_modules.append(taglib_module)
|
|
lib = import_library(taglib_module)
|
|
if lib:
|
|
libraries[library_name] = lib
|
|
break
|
|
if not lib:
|
|
raise InvalidTemplateLibrary("Template library %s not found, tried %s" % (library_name, ','.join(tried_modules)))
|
|
return lib
|
|
|
|
def add_to_builtins(module):
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builtins.append(import_library(module))
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add_to_builtins('django.template.defaulttags')
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add_to_builtins('django.template.defaultfilters')
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