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bbf6d9b026
Bugfix for feeds
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- load new books now working
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login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
735 lines
28 KiB
Python
735 lines
28 KiB
Python
# -*- coding: utf-8 -*-
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"""
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jinja2.lexer
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~~~~~~~~~~~~
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This module implements a Jinja / Python combination lexer. The
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`Lexer` class provided by this module is used to do some preprocessing
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for Jinja.
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On the one hand it filters out invalid operators like the bitshift
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operators we don't allow in templates. On the other hand it separates
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template code and python code in expressions.
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:copyright: (c) 2010 by the Jinja Team.
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:license: BSD, see LICENSE for more details.
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"""
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import re
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from operator import itemgetter
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from collections import deque
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from jinja2.exceptions import TemplateSyntaxError
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from jinja2.utils import LRUCache
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from jinja2._compat import iteritems, implements_iterator, text_type, \
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intern, PY2
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# cache for the lexers. Exists in order to be able to have multiple
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# environments with the same lexer
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_lexer_cache = LRUCache(50)
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# static regular expressions
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whitespace_re = re.compile(r'\s+', re.U)
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string_re = re.compile(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
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r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S)
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integer_re = re.compile(r'\d+')
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# we use the unicode identifier rule if this python version is able
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# to handle unicode identifiers, otherwise the standard ASCII one.
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try:
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compile('föö', '<unknown>', 'eval')
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except SyntaxError:
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name_re = re.compile(r'\b[a-zA-Z_][a-zA-Z0-9_]*\b')
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else:
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from jinja2 import _stringdefs
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name_re = re.compile(r'[%s][%s]*' % (_stringdefs.xid_start,
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_stringdefs.xid_continue))
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float_re = re.compile(r'(?<!\.)\d+\.\d+')
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newline_re = re.compile(r'(\r\n|\r|\n)')
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# internal the tokens and keep references to them
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TOKEN_ADD = intern('add')
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TOKEN_ASSIGN = intern('assign')
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TOKEN_COLON = intern('colon')
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TOKEN_COMMA = intern('comma')
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TOKEN_DIV = intern('div')
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TOKEN_DOT = intern('dot')
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TOKEN_EQ = intern('eq')
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TOKEN_FLOORDIV = intern('floordiv')
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TOKEN_GT = intern('gt')
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TOKEN_GTEQ = intern('gteq')
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TOKEN_LBRACE = intern('lbrace')
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TOKEN_LBRACKET = intern('lbracket')
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TOKEN_LPAREN = intern('lparen')
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TOKEN_LT = intern('lt')
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TOKEN_LTEQ = intern('lteq')
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TOKEN_MOD = intern('mod')
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TOKEN_MUL = intern('mul')
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TOKEN_NE = intern('ne')
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TOKEN_PIPE = intern('pipe')
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TOKEN_POW = intern('pow')
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TOKEN_RBRACE = intern('rbrace')
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TOKEN_RBRACKET = intern('rbracket')
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TOKEN_RPAREN = intern('rparen')
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TOKEN_SEMICOLON = intern('semicolon')
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TOKEN_SUB = intern('sub')
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TOKEN_TILDE = intern('tilde')
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TOKEN_WHITESPACE = intern('whitespace')
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TOKEN_FLOAT = intern('float')
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TOKEN_INTEGER = intern('integer')
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TOKEN_NAME = intern('name')
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TOKEN_STRING = intern('string')
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TOKEN_OPERATOR = intern('operator')
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TOKEN_BLOCK_BEGIN = intern('block_begin')
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TOKEN_BLOCK_END = intern('block_end')
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TOKEN_VARIABLE_BEGIN = intern('variable_begin')
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TOKEN_VARIABLE_END = intern('variable_end')
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TOKEN_RAW_BEGIN = intern('raw_begin')
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TOKEN_RAW_END = intern('raw_end')
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TOKEN_COMMENT_BEGIN = intern('comment_begin')
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TOKEN_COMMENT_END = intern('comment_end')
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TOKEN_COMMENT = intern('comment')
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TOKEN_LINESTATEMENT_BEGIN = intern('linestatement_begin')
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TOKEN_LINESTATEMENT_END = intern('linestatement_end')
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TOKEN_LINECOMMENT_BEGIN = intern('linecomment_begin')
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TOKEN_LINECOMMENT_END = intern('linecomment_end')
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TOKEN_LINECOMMENT = intern('linecomment')
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TOKEN_DATA = intern('data')
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TOKEN_INITIAL = intern('initial')
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TOKEN_EOF = intern('eof')
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# bind operators to token types
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operators = {
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'+': TOKEN_ADD,
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'-': TOKEN_SUB,
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'/': TOKEN_DIV,
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'//': TOKEN_FLOORDIV,
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'*': TOKEN_MUL,
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'%': TOKEN_MOD,
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'**': TOKEN_POW,
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'~': TOKEN_TILDE,
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'[': TOKEN_LBRACKET,
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']': TOKEN_RBRACKET,
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'(': TOKEN_LPAREN,
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')': TOKEN_RPAREN,
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'{': TOKEN_LBRACE,
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'}': TOKEN_RBRACE,
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'==': TOKEN_EQ,
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'!=': TOKEN_NE,
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'>': TOKEN_GT,
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'>=': TOKEN_GTEQ,
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'<': TOKEN_LT,
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'<=': TOKEN_LTEQ,
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'=': TOKEN_ASSIGN,
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'.': TOKEN_DOT,
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':': TOKEN_COLON,
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'|': TOKEN_PIPE,
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',': TOKEN_COMMA,
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';': TOKEN_SEMICOLON
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}
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reverse_operators = dict([(v, k) for k, v in iteritems(operators)])
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assert len(operators) == len(reverse_operators), 'operators dropped'
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operator_re = re.compile('(%s)' % '|'.join(re.escape(x) for x in
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sorted(operators, key=lambda x: -len(x))))
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ignored_tokens = frozenset([TOKEN_COMMENT_BEGIN, TOKEN_COMMENT,
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TOKEN_COMMENT_END, TOKEN_WHITESPACE,
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TOKEN_LINECOMMENT_BEGIN, TOKEN_LINECOMMENT_END,
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TOKEN_LINECOMMENT])
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ignore_if_empty = frozenset([TOKEN_WHITESPACE, TOKEN_DATA,
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TOKEN_COMMENT, TOKEN_LINECOMMENT])
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def _describe_token_type(token_type):
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if token_type in reverse_operators:
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return reverse_operators[token_type]
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return {
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TOKEN_COMMENT_BEGIN: 'begin of comment',
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TOKEN_COMMENT_END: 'end of comment',
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TOKEN_COMMENT: 'comment',
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TOKEN_LINECOMMENT: 'comment',
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TOKEN_BLOCK_BEGIN: 'begin of statement block',
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TOKEN_BLOCK_END: 'end of statement block',
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TOKEN_VARIABLE_BEGIN: 'begin of print statement',
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TOKEN_VARIABLE_END: 'end of print statement',
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TOKEN_LINESTATEMENT_BEGIN: 'begin of line statement',
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TOKEN_LINESTATEMENT_END: 'end of line statement',
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TOKEN_DATA: 'template data / text',
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TOKEN_EOF: 'end of template'
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}.get(token_type, token_type)
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def describe_token(token):
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"""Returns a description of the token."""
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if token.type == 'name':
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return token.value
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return _describe_token_type(token.type)
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def describe_token_expr(expr):
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"""Like `describe_token` but for token expressions."""
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if ':' in expr:
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type, value = expr.split(':', 1)
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if type == 'name':
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return value
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else:
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type = expr
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return _describe_token_type(type)
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def count_newlines(value):
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"""Count the number of newline characters in the string. This is
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useful for extensions that filter a stream.
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"""
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return len(newline_re.findall(value))
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def compile_rules(environment):
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"""Compiles all the rules from the environment into a list of rules."""
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e = re.escape
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rules = [
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(len(environment.comment_start_string), 'comment',
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e(environment.comment_start_string)),
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(len(environment.block_start_string), 'block',
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e(environment.block_start_string)),
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(len(environment.variable_start_string), 'variable',
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e(environment.variable_start_string))
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]
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if environment.line_statement_prefix is not None:
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rules.append((len(environment.line_statement_prefix), 'linestatement',
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r'^[ \t\v]*' + e(environment.line_statement_prefix)))
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if environment.line_comment_prefix is not None:
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rules.append((len(environment.line_comment_prefix), 'linecomment',
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r'(?:^|(?<=\S))[^\S\r\n]*' +
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e(environment.line_comment_prefix)))
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return [x[1:] for x in sorted(rules, reverse=True)]
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class Failure(object):
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"""Class that raises a `TemplateSyntaxError` if called.
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Used by the `Lexer` to specify known errors.
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"""
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def __init__(self, message, cls=TemplateSyntaxError):
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self.message = message
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self.error_class = cls
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def __call__(self, lineno, filename):
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raise self.error_class(self.message, lineno, filename)
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class Token(tuple):
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"""Token class."""
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__slots__ = ()
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lineno, type, value = (property(itemgetter(x)) for x in range(3))
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def __new__(cls, lineno, type, value):
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return tuple.__new__(cls, (lineno, intern(str(type)), value))
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def __str__(self):
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if self.type in reverse_operators:
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return reverse_operators[self.type]
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elif self.type == 'name':
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return self.value
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return self.type
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def test(self, expr):
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"""Test a token against a token expression. This can either be a
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token type or ``'token_type:token_value'``. This can only test
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against string values and types.
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"""
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# here we do a regular string equality check as test_any is usually
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# passed an iterable of not interned strings.
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if self.type == expr:
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return True
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elif ':' in expr:
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return expr.split(':', 1) == [self.type, self.value]
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return False
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def test_any(self, *iterable):
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"""Test against multiple token expressions."""
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for expr in iterable:
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if self.test(expr):
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return True
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return False
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def __repr__(self):
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return 'Token(%r, %r, %r)' % (
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self.lineno,
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self.type,
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self.value
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)
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@implements_iterator
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class TokenStreamIterator(object):
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"""The iterator for tokenstreams. Iterate over the stream
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until the eof token is reached.
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"""
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def __init__(self, stream):
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self.stream = stream
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def __iter__(self):
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return self
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def __next__(self):
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token = self.stream.current
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if token.type is TOKEN_EOF:
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self.stream.close()
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raise StopIteration()
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next(self.stream)
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return token
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@implements_iterator
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class TokenStream(object):
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"""A token stream is an iterable that yields :class:`Token`\s. The
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parser however does not iterate over it but calls :meth:`next` to go
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one token ahead. The current active token is stored as :attr:`current`.
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"""
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def __init__(self, generator, name, filename):
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self._iter = iter(generator)
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self._pushed = deque()
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self.name = name
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self.filename = filename
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self.closed = False
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self.current = Token(1, TOKEN_INITIAL, '')
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next(self)
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def __iter__(self):
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return TokenStreamIterator(self)
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def __bool__(self):
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return bool(self._pushed) or self.current.type is not TOKEN_EOF
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__nonzero__ = __bool__ # py2
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eos = property(lambda x: not x, doc="Are we at the end of the stream?")
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def push(self, token):
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"""Push a token back to the stream."""
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self._pushed.append(token)
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def look(self):
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"""Look at the next token."""
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old_token = next(self)
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result = self.current
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self.push(result)
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self.current = old_token
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return result
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def skip(self, n=1):
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"""Got n tokens ahead."""
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for x in range(n):
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next(self)
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def next_if(self, expr):
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"""Perform the token test and return the token if it matched.
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Otherwise the return value is `None`.
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"""
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if self.current.test(expr):
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return next(self)
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def skip_if(self, expr):
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"""Like :meth:`next_if` but only returns `True` or `False`."""
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return self.next_if(expr) is not None
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def __next__(self):
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"""Go one token ahead and return the old one"""
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rv = self.current
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if self._pushed:
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self.current = self._pushed.popleft()
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elif self.current.type is not TOKEN_EOF:
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try:
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self.current = next(self._iter)
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except StopIteration:
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self.close()
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return rv
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def close(self):
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"""Close the stream."""
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self.current = Token(self.current.lineno, TOKEN_EOF, '')
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self._iter = None
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self.closed = True
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def expect(self, expr):
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"""Expect a given token type and return it. This accepts the same
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argument as :meth:`jinja2.lexer.Token.test`.
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"""
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if not self.current.test(expr):
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expr = describe_token_expr(expr)
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if self.current.type is TOKEN_EOF:
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raise TemplateSyntaxError('unexpected end of template, '
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'expected %r.' % expr,
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self.current.lineno,
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self.name, self.filename)
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raise TemplateSyntaxError("expected token %r, got %r" %
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(expr, describe_token(self.current)),
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self.current.lineno,
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self.name, self.filename)
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try:
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return self.current
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finally:
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next(self)
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def get_lexer(environment):
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"""Return a lexer which is probably cached."""
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key = (environment.block_start_string,
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environment.block_end_string,
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environment.variable_start_string,
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environment.variable_end_string,
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environment.comment_start_string,
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environment.comment_end_string,
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environment.line_statement_prefix,
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environment.line_comment_prefix,
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environment.trim_blocks,
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environment.lstrip_blocks,
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environment.newline_sequence,
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environment.keep_trailing_newline)
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lexer = _lexer_cache.get(key)
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if lexer is None:
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lexer = Lexer(environment)
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_lexer_cache[key] = lexer
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return lexer
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class Lexer(object):
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"""Class that implements a lexer for a given environment. Automatically
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created by the environment class, usually you don't have to do that.
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Note that the lexer is not automatically bound to an environment.
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Multiple environments can share the same lexer.
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"""
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def __init__(self, environment):
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# shortcuts
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c = lambda x: re.compile(x, re.M | re.S)
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e = re.escape
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# lexing rules for tags
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tag_rules = [
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(whitespace_re, TOKEN_WHITESPACE, None),
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(float_re, TOKEN_FLOAT, None),
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(integer_re, TOKEN_INTEGER, None),
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(name_re, TOKEN_NAME, None),
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(string_re, TOKEN_STRING, None),
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(operator_re, TOKEN_OPERATOR, None)
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]
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# assemble the root lexing rule. because "|" is ungreedy
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# we have to sort by length so that the lexer continues working
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# as expected when we have parsing rules like <% for block and
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# <%= for variables. (if someone wants asp like syntax)
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# variables are just part of the rules if variable processing
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# is required.
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root_tag_rules = compile_rules(environment)
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# block suffix if trimming is enabled
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block_suffix_re = environment.trim_blocks and '\\n?' or ''
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# strip leading spaces if lstrip_blocks is enabled
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prefix_re = {}
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if environment.lstrip_blocks:
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# use '{%+' to manually disable lstrip_blocks behavior
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no_lstrip_re = e('+')
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# detect overlap between block and variable or comment strings
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block_diff = c(r'^%s(.*)' % e(environment.block_start_string))
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# make sure we don't mistake a block for a variable or a comment
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m = block_diff.match(environment.comment_start_string)
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no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
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m = block_diff.match(environment.variable_start_string)
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no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
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# detect overlap between comment and variable strings
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comment_diff = c(r'^%s(.*)' % e(environment.comment_start_string))
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m = comment_diff.match(environment.variable_start_string)
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no_variable_re = m and r'(?!%s)' % e(m.group(1)) or ''
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lstrip_re = r'^[ \t]*'
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block_prefix_re = r'%s%s(?!%s)|%s\+?' % (
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lstrip_re,
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e(environment.block_start_string),
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no_lstrip_re,
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e(environment.block_start_string),
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)
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comment_prefix_re = r'%s%s%s|%s\+?' % (
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lstrip_re,
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e(environment.comment_start_string),
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no_variable_re,
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e(environment.comment_start_string),
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)
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prefix_re['block'] = block_prefix_re
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prefix_re['comment'] = comment_prefix_re
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else:
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block_prefix_re = '%s' % e(environment.block_start_string)
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self.newline_sequence = environment.newline_sequence
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self.keep_trailing_newline = environment.keep_trailing_newline
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# global lexing rules
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self.rules = {
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'root': [
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# directives
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(c('(.*?)(?:%s)' % '|'.join(
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[r'(?P<raw_begin>(?:\s*%s\-|%s)\s*raw\s*(?:\-%s\s*|%s))' % (
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e(environment.block_start_string),
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block_prefix_re,
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e(environment.block_end_string),
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e(environment.block_end_string)
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)] + [
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r'(?P<%s_begin>\s*%s\-|%s)' % (n, r, prefix_re.get(n,r))
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for n, r in root_tag_rules
|
|
])), (TOKEN_DATA, '#bygroup'), '#bygroup'),
|
|
# data
|
|
(c('.+'), TOKEN_DATA, None)
|
|
],
|
|
# comments
|
|
TOKEN_COMMENT_BEGIN: [
|
|
(c(r'(.*?)((?:\-%s\s*|%s)%s)' % (
|
|
e(environment.comment_end_string),
|
|
e(environment.comment_end_string),
|
|
block_suffix_re
|
|
)), (TOKEN_COMMENT, TOKEN_COMMENT_END), '#pop'),
|
|
(c('(.)'), (Failure('Missing end of comment tag'),), None)
|
|
],
|
|
# blocks
|
|
TOKEN_BLOCK_BEGIN: [
|
|
(c('(?:\-%s\s*|%s)%s' % (
|
|
e(environment.block_end_string),
|
|
e(environment.block_end_string),
|
|
block_suffix_re
|
|
)), TOKEN_BLOCK_END, '#pop'),
|
|
] + tag_rules,
|
|
# variables
|
|
TOKEN_VARIABLE_BEGIN: [
|
|
(c('\-%s\s*|%s' % (
|
|
e(environment.variable_end_string),
|
|
e(environment.variable_end_string)
|
|
)), TOKEN_VARIABLE_END, '#pop')
|
|
] + tag_rules,
|
|
# raw block
|
|
TOKEN_RAW_BEGIN: [
|
|
(c('(.*?)((?:\s*%s\-|%s)\s*endraw\s*(?:\-%s\s*|%s%s))' % (
|
|
e(environment.block_start_string),
|
|
block_prefix_re,
|
|
e(environment.block_end_string),
|
|
e(environment.block_end_string),
|
|
block_suffix_re
|
|
)), (TOKEN_DATA, TOKEN_RAW_END), '#pop'),
|
|
(c('(.)'), (Failure('Missing end of raw directive'),), None)
|
|
],
|
|
# line statements
|
|
TOKEN_LINESTATEMENT_BEGIN: [
|
|
(c(r'\s*(\n|$)'), TOKEN_LINESTATEMENT_END, '#pop')
|
|
] + tag_rules,
|
|
# line comments
|
|
TOKEN_LINECOMMENT_BEGIN: [
|
|
(c(r'(.*?)()(?=\n|$)'), (TOKEN_LINECOMMENT,
|
|
TOKEN_LINECOMMENT_END), '#pop')
|
|
]
|
|
}
|
|
|
|
def _normalize_newlines(self, value):
|
|
"""Called for strings and template data to normalize it to unicode."""
|
|
return newline_re.sub(self.newline_sequence, value)
|
|
|
|
def tokenize(self, source, name=None, filename=None, state=None):
|
|
"""Calls tokeniter + tokenize and wraps it in a token stream.
|
|
"""
|
|
stream = self.tokeniter(source, name, filename, state)
|
|
return TokenStream(self.wrap(stream, name, filename), name, filename)
|
|
|
|
def wrap(self, stream, name=None, filename=None):
|
|
"""This is called with the stream as returned by `tokenize` and wraps
|
|
every token in a :class:`Token` and converts the value.
|
|
"""
|
|
for lineno, token, value in stream:
|
|
if token in ignored_tokens:
|
|
continue
|
|
elif token == 'linestatement_begin':
|
|
token = 'block_begin'
|
|
elif token == 'linestatement_end':
|
|
token = 'block_end'
|
|
# we are not interested in those tokens in the parser
|
|
elif token in ('raw_begin', 'raw_end'):
|
|
continue
|
|
elif token == 'data':
|
|
value = self._normalize_newlines(value)
|
|
elif token == 'keyword':
|
|
token = value
|
|
elif token == 'name':
|
|
value = str(value)
|
|
elif token == 'string':
|
|
# try to unescape string
|
|
try:
|
|
value = self._normalize_newlines(value[1:-1]) \
|
|
.encode('ascii', 'backslashreplace') \
|
|
.decode('unicode-escape')
|
|
except Exception as e:
|
|
msg = str(e).split(':')[-1].strip()
|
|
raise TemplateSyntaxError(msg, lineno, name, filename)
|
|
# if we can express it as bytestring (ascii only)
|
|
# we do that for support of semi broken APIs
|
|
# as datetime.datetime.strftime. On python 3 this
|
|
# call becomes a noop thanks to 2to3
|
|
if PY2:
|
|
try:
|
|
value = value.encode('ascii')
|
|
except UnicodeError:
|
|
pass
|
|
elif token == 'integer':
|
|
value = int(value)
|
|
elif token == 'float':
|
|
value = float(value)
|
|
elif token == 'operator':
|
|
token = operators[value]
|
|
yield Token(lineno, token, value)
|
|
|
|
def tokeniter(self, source, name, filename=None, state=None):
|
|
"""This method tokenizes the text and returns the tokens in a
|
|
generator. Use this method if you just want to tokenize a template.
|
|
"""
|
|
source = text_type(source)
|
|
lines = source.splitlines()
|
|
if self.keep_trailing_newline and source:
|
|
for newline in ('\r\n', '\r', '\n'):
|
|
if source.endswith(newline):
|
|
lines.append('')
|
|
break
|
|
source = '\n'.join(lines)
|
|
pos = 0
|
|
lineno = 1
|
|
stack = ['root']
|
|
if state is not None and state != 'root':
|
|
assert state in ('variable', 'block'), 'invalid state'
|
|
stack.append(state + '_begin')
|
|
else:
|
|
state = 'root'
|
|
statetokens = self.rules[stack[-1]]
|
|
source_length = len(source)
|
|
|
|
balancing_stack = []
|
|
|
|
while 1:
|
|
# tokenizer loop
|
|
for regex, tokens, new_state in statetokens:
|
|
m = regex.match(source, pos)
|
|
# if no match we try again with the next rule
|
|
if m is None:
|
|
continue
|
|
|
|
# we only match blocks and variables if braces / parentheses
|
|
# are balanced. continue parsing with the lower rule which
|
|
# is the operator rule. do this only if the end tags look
|
|
# like operators
|
|
if balancing_stack and \
|
|
tokens in ('variable_end', 'block_end',
|
|
'linestatement_end'):
|
|
continue
|
|
|
|
# tuples support more options
|
|
if isinstance(tokens, tuple):
|
|
for idx, token in enumerate(tokens):
|
|
# failure group
|
|
if token.__class__ is Failure:
|
|
raise token(lineno, filename)
|
|
# bygroup is a bit more complex, in that case we
|
|
# yield for the current token the first named
|
|
# group that matched
|
|
elif token == '#bygroup':
|
|
for key, value in iteritems(m.groupdict()):
|
|
if value is not None:
|
|
yield lineno, key, value
|
|
lineno += value.count('\n')
|
|
break
|
|
else:
|
|
raise RuntimeError('%r wanted to resolve '
|
|
'the token dynamically'
|
|
' but no group matched'
|
|
% regex)
|
|
# normal group
|
|
else:
|
|
data = m.group(idx + 1)
|
|
if data or token not in ignore_if_empty:
|
|
yield lineno, token, data
|
|
lineno += data.count('\n')
|
|
|
|
# strings as token just are yielded as it.
|
|
else:
|
|
data = m.group()
|
|
# update brace/parentheses balance
|
|
if tokens == 'operator':
|
|
if data == '{':
|
|
balancing_stack.append('}')
|
|
elif data == '(':
|
|
balancing_stack.append(')')
|
|
elif data == '[':
|
|
balancing_stack.append(']')
|
|
elif data in ('}', ')', ']'):
|
|
if not balancing_stack:
|
|
raise TemplateSyntaxError('unexpected \'%s\'' %
|
|
data, lineno, name,
|
|
filename)
|
|
expected_op = balancing_stack.pop()
|
|
if expected_op != data:
|
|
raise TemplateSyntaxError('unexpected \'%s\', '
|
|
'expected \'%s\'' %
|
|
(data, expected_op),
|
|
lineno, name,
|
|
filename)
|
|
# yield items
|
|
if data or tokens not in ignore_if_empty:
|
|
yield lineno, tokens, data
|
|
lineno += data.count('\n')
|
|
|
|
# fetch new position into new variable so that we can check
|
|
# if there is a internal parsing error which would result
|
|
# in an infinite loop
|
|
pos2 = m.end()
|
|
|
|
# handle state changes
|
|
if new_state is not None:
|
|
# remove the uppermost state
|
|
if new_state == '#pop':
|
|
stack.pop()
|
|
# resolve the new state by group checking
|
|
elif new_state == '#bygroup':
|
|
for key, value in iteritems(m.groupdict()):
|
|
if value is not None:
|
|
stack.append(key)
|
|
break
|
|
else:
|
|
raise RuntimeError('%r wanted to resolve the '
|
|
'new state dynamically but'
|
|
' no group matched' %
|
|
regex)
|
|
# direct state name given
|
|
else:
|
|
stack.append(new_state)
|
|
statetokens = self.rules[stack[-1]]
|
|
# we are still at the same position and no stack change.
|
|
# this means a loop without break condition, avoid that and
|
|
# raise error
|
|
elif pos2 == pos:
|
|
raise RuntimeError('%r yielded empty string without '
|
|
'stack change' % regex)
|
|
# publish new function and start again
|
|
pos = pos2
|
|
break
|
|
# if loop terminated without break we haven't found a single match
|
|
# either we are at the end of the file or we have a problem
|
|
else:
|
|
# end of text
|
|
if pos >= source_length:
|
|
return
|
|
# something went wrong
|
|
raise TemplateSyntaxError('unexpected char %r at %d' %
|
|
(source[pos], pos), lineno,
|
|
name, filename)
|