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-rw-r--r--src/jinja2/lexer.py801
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diff --git a/src/jinja2/lexer.py b/src/jinja2/lexer.py
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-"""Implements a Jinja / Python combination lexer. The ``Lexer`` class
-is used to do some preprocessing. It filters out invalid operators like
-the bitshift operators we don't allow in templates. It separates
-template code and python code in expressions.
-"""
-import re
-from ast import literal_eval
-from collections import deque
-from operator import itemgetter
-from sys import intern
-
-from ._identifier import pattern as name_re
-from .exceptions import TemplateSyntaxError
-from .utils import LRUCache
-
-# cache for the lexers. Exists in order to be able to have multiple
-# environments with the same lexer
-_lexer_cache = LRUCache(50)
-
-# static regular expressions
-whitespace_re = re.compile(r"\s+")
-newline_re = re.compile(r"(\r\n|\r|\n)")
-string_re = re.compile(
- r"('([^'\\]*(?:\\.[^'\\]*)*)'" r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S
-)
-integer_re = re.compile(r"(\d+_)*\d+")
-float_re = re.compile(
- r"""
- (?<!\.) # doesn't start with a .
- (\d+_)*\d+ # digits, possibly _ separated
- (
- (\.(\d+_)*\d+)? # optional fractional part
- e[+\-]?(\d+_)*\d+ # exponent part
- |
- \.(\d+_)*\d+ # required fractional part
- )
- """,
- re.IGNORECASE | re.VERBOSE,
-)
-
-# internal the tokens and keep references to them
-TOKEN_ADD = intern("add")
-TOKEN_ASSIGN = intern("assign")
-TOKEN_COLON = intern("colon")
-TOKEN_COMMA = intern("comma")
-TOKEN_DIV = intern("div")
-TOKEN_DOT = intern("dot")
-TOKEN_EQ = intern("eq")
-TOKEN_FLOORDIV = intern("floordiv")
-TOKEN_GT = intern("gt")
-TOKEN_GTEQ = intern("gteq")
-TOKEN_LBRACE = intern("lbrace")
-TOKEN_LBRACKET = intern("lbracket")
-TOKEN_LPAREN = intern("lparen")
-TOKEN_LT = intern("lt")
-TOKEN_LTEQ = intern("lteq")
-TOKEN_MOD = intern("mod")
-TOKEN_MUL = intern("mul")
-TOKEN_NE = intern("ne")
-TOKEN_PIPE = intern("pipe")
-TOKEN_POW = intern("pow")
-TOKEN_RBRACE = intern("rbrace")
-TOKEN_RBRACKET = intern("rbracket")
-TOKEN_RPAREN = intern("rparen")
-TOKEN_SEMICOLON = intern("semicolon")
-TOKEN_SUB = intern("sub")
-TOKEN_TILDE = intern("tilde")
-TOKEN_WHITESPACE = intern("whitespace")
-TOKEN_FLOAT = intern("float")
-TOKEN_INTEGER = intern("integer")
-TOKEN_NAME = intern("name")
-TOKEN_STRING = intern("string")
-TOKEN_OPERATOR = intern("operator")
-TOKEN_BLOCK_BEGIN = intern("block_begin")
-TOKEN_BLOCK_END = intern("block_end")
-TOKEN_VARIABLE_BEGIN = intern("variable_begin")
-TOKEN_VARIABLE_END = intern("variable_end")
-TOKEN_RAW_BEGIN = intern("raw_begin")
-TOKEN_RAW_END = intern("raw_end")
-TOKEN_COMMENT_BEGIN = intern("comment_begin")
-TOKEN_COMMENT_END = intern("comment_end")
-TOKEN_COMMENT = intern("comment")
-TOKEN_LINESTATEMENT_BEGIN = intern("linestatement_begin")
-TOKEN_LINESTATEMENT_END = intern("linestatement_end")
-TOKEN_LINECOMMENT_BEGIN = intern("linecomment_begin")
-TOKEN_LINECOMMENT_END = intern("linecomment_end")
-TOKEN_LINECOMMENT = intern("linecomment")
-TOKEN_DATA = intern("data")
-TOKEN_INITIAL = intern("initial")
-TOKEN_EOF = intern("eof")
-
-# bind operators to token types
-operators = {
- "+": TOKEN_ADD,
- "-": TOKEN_SUB,
- "/": TOKEN_DIV,
- "//": TOKEN_FLOORDIV,
- "*": TOKEN_MUL,
- "%": TOKEN_MOD,
- "**": TOKEN_POW,
- "~": TOKEN_TILDE,
- "[": TOKEN_LBRACKET,
- "]": TOKEN_RBRACKET,
- "(": TOKEN_LPAREN,
- ")": TOKEN_RPAREN,
- "{": TOKEN_LBRACE,
- "}": TOKEN_RBRACE,
- "==": TOKEN_EQ,
- "!=": TOKEN_NE,
- ">": TOKEN_GT,
- ">=": TOKEN_GTEQ,
- "<": TOKEN_LT,
- "<=": TOKEN_LTEQ,
- "=": TOKEN_ASSIGN,
- ".": TOKEN_DOT,
- ":": TOKEN_COLON,
- "|": TOKEN_PIPE,
- ",": TOKEN_COMMA,
- ";": TOKEN_SEMICOLON,
-}
-
-reverse_operators = {v: k for k, v in operators.items()}
-assert len(operators) == len(reverse_operators), "operators dropped"
-operator_re = re.compile(
- f"({'|'.join(re.escape(x) for x in sorted(operators, key=lambda x: -len(x)))})"
-)
-
-ignored_tokens = frozenset(
- [
- TOKEN_COMMENT_BEGIN,
- TOKEN_COMMENT,
- TOKEN_COMMENT_END,
- TOKEN_WHITESPACE,
- TOKEN_LINECOMMENT_BEGIN,
- TOKEN_LINECOMMENT_END,
- TOKEN_LINECOMMENT,
- ]
-)
-ignore_if_empty = frozenset(
- [TOKEN_WHITESPACE, TOKEN_DATA, TOKEN_COMMENT, TOKEN_LINECOMMENT]
-)
-
-
-def _describe_token_type(token_type):
- if token_type in reverse_operators:
- return reverse_operators[token_type]
- return {
- TOKEN_COMMENT_BEGIN: "begin of comment",
- TOKEN_COMMENT_END: "end of comment",
- TOKEN_COMMENT: "comment",
- TOKEN_LINECOMMENT: "comment",
- TOKEN_BLOCK_BEGIN: "begin of statement block",
- TOKEN_BLOCK_END: "end of statement block",
- TOKEN_VARIABLE_BEGIN: "begin of print statement",
- TOKEN_VARIABLE_END: "end of print statement",
- TOKEN_LINESTATEMENT_BEGIN: "begin of line statement",
- TOKEN_LINESTATEMENT_END: "end of line statement",
- TOKEN_DATA: "template data / text",
- TOKEN_EOF: "end of template",
- }.get(token_type, token_type)
-
-
-def describe_token(token):
- """Returns a description of the token."""
- if token.type == TOKEN_NAME:
- return token.value
- return _describe_token_type(token.type)
-
-
-def describe_token_expr(expr):
- """Like `describe_token` but for token expressions."""
- if ":" in expr:
- type, value = expr.split(":", 1)
- if type == TOKEN_NAME:
- return value
- else:
- type = expr
- return _describe_token_type(type)
-
-
-def count_newlines(value):
- """Count the number of newline characters in the string. This is
- useful for extensions that filter a stream.
- """
- return len(newline_re.findall(value))
-
-
-def compile_rules(environment):
- """Compiles all the rules from the environment into a list of rules."""
- e = re.escape
- rules = [
- (
- len(environment.comment_start_string),
- TOKEN_COMMENT_BEGIN,
- e(environment.comment_start_string),
- ),
- (
- len(environment.block_start_string),
- TOKEN_BLOCK_BEGIN,
- e(environment.block_start_string),
- ),
- (
- len(environment.variable_start_string),
- TOKEN_VARIABLE_BEGIN,
- e(environment.variable_start_string),
- ),
- ]
-
- if environment.line_statement_prefix is not None:
- rules.append(
- (
- len(environment.line_statement_prefix),
- TOKEN_LINESTATEMENT_BEGIN,
- r"^[ \t\v]*" + e(environment.line_statement_prefix),
- )
- )
- if environment.line_comment_prefix is not None:
- rules.append(
- (
- len(environment.line_comment_prefix),
- TOKEN_LINECOMMENT_BEGIN,
- r"(?:^|(?<=\S))[^\S\r\n]*" + e(environment.line_comment_prefix),
- )
- )
-
- return [x[1:] for x in sorted(rules, reverse=True)]
-
-
-class Failure:
- """Class that raises a `TemplateSyntaxError` if called.
- Used by the `Lexer` to specify known errors.
- """
-
- def __init__(self, message, cls=TemplateSyntaxError):
- self.message = message
- self.error_class = cls
-
- def __call__(self, lineno, filename):
- raise self.error_class(self.message, lineno, filename)
-
-
-class Token(tuple):
- """Token class."""
-
- __slots__ = ()
- lineno, type, value = (property(itemgetter(x)) for x in range(3))
-
- def __new__(cls, lineno, type, value):
- return tuple.__new__(cls, (lineno, intern(str(type)), value))
-
- def __str__(self):
- if self.type in reverse_operators:
- return reverse_operators[self.type]
- elif self.type == "name":
- return self.value
- return self.type
-
- def test(self, expr):
- """Test a token against a token expression. This can either be a
- token type or ``'token_type:token_value'``. This can only test
- against string values and types.
- """
- # here we do a regular string equality check as test_any is usually
- # passed an iterable of not interned strings.
- if self.type == expr:
- return True
- elif ":" in expr:
- return expr.split(":", 1) == [self.type, self.value]
- return False
-
- def test_any(self, *iterable):
- """Test against multiple token expressions."""
- for expr in iterable:
- if self.test(expr):
- return True
- return False
-
- def __repr__(self):
- return f"Token({self.lineno!r}, {self.type!r}, {self.value!r})"
-
-
-class TokenStreamIterator:
- """The iterator for tokenstreams. Iterate over the stream
- until the eof token is reached.
- """
-
- def __init__(self, stream):
- self.stream = stream
-
- def __iter__(self):
- return self
-
- def __next__(self):
- token = self.stream.current
- if token.type is TOKEN_EOF:
- self.stream.close()
- raise StopIteration()
- next(self.stream)
- return token
-
-
-class TokenStream:
- """A token stream is an iterable that yields :class:`Token`\\s. The
- parser however does not iterate over it but calls :meth:`next` to go
- one token ahead. The current active token is stored as :attr:`current`.
- """
-
- def __init__(self, generator, name, filename):
- self._iter = iter(generator)
- self._pushed = deque()
- self.name = name
- self.filename = filename
- self.closed = False
- self.current = Token(1, TOKEN_INITIAL, "")
- next(self)
-
- def __iter__(self):
- return TokenStreamIterator(self)
-
- def __bool__(self):
- return bool(self._pushed) or self.current.type is not TOKEN_EOF
-
- __nonzero__ = __bool__ # py2
-
- @property
- def eos(self):
- """Are we at the end of the stream?"""
- return not self
-
- def push(self, token):
- """Push a token back to the stream."""
- self._pushed.append(token)
-
- def look(self):
- """Look at the next token."""
- old_token = next(self)
- result = self.current
- self.push(result)
- self.current = old_token
- return result
-
- def skip(self, n=1):
- """Got n tokens ahead."""
- for _ in range(n):
- next(self)
-
- def next_if(self, expr):
- """Perform the token test and return the token if it matched.
- Otherwise the return value is `None`.
- """
- if self.current.test(expr):
- return next(self)
-
- def skip_if(self, expr):
- """Like :meth:`next_if` but only returns `True` or `False`."""
- return self.next_if(expr) is not None
-
- def __next__(self):
- """Go one token ahead and return the old one.
-
- Use the built-in :func:`next` instead of calling this directly.
- """
- rv = self.current
- if self._pushed:
- self.current = self._pushed.popleft()
- elif self.current.type is not TOKEN_EOF:
- try:
- self.current = next(self._iter)
- except StopIteration:
- self.close()
- return rv
-
- def close(self):
- """Close the stream."""
- self.current = Token(self.current.lineno, TOKEN_EOF, "")
- self._iter = None
- self.closed = True
-
- def expect(self, expr):
- """Expect a given token type and return it. This accepts the same
- argument as :meth:`jinja2.lexer.Token.test`.
- """
- if not self.current.test(expr):
- expr = describe_token_expr(expr)
- if self.current.type is TOKEN_EOF:
- raise TemplateSyntaxError(
- f"unexpected end of template, expected {expr!r}.",
- self.current.lineno,
- self.name,
- self.filename,
- )
- raise TemplateSyntaxError(
- f"expected token {expr!r}, got {describe_token(self.current)!r}",
- self.current.lineno,
- self.name,
- self.filename,
- )
- try:
- return self.current
- finally:
- next(self)
-
-
-def get_lexer(environment):
- """Return a lexer which is probably cached."""
- key = (
- environment.block_start_string,
- environment.block_end_string,
- environment.variable_start_string,
- environment.variable_end_string,
- environment.comment_start_string,
- environment.comment_end_string,
- environment.line_statement_prefix,
- environment.line_comment_prefix,
- environment.trim_blocks,
- environment.lstrip_blocks,
- environment.newline_sequence,
- environment.keep_trailing_newline,
- )
- lexer = _lexer_cache.get(key)
- if lexer is None:
- lexer = Lexer(environment)
- _lexer_cache[key] = lexer
- return lexer
-
-
-class OptionalLStrip(tuple):
- """A special tuple for marking a point in the state that can have
- lstrip applied.
- """
-
- __slots__ = ()
-
- # Even though it looks like a no-op, creating instances fails
- # without this.
- def __new__(cls, *members, **kwargs):
- return super().__new__(cls, members)
-
-
-class Lexer:
- """Class that implements a lexer for a given environment. Automatically
- created by the environment class, usually you don't have to do that.
-
- Note that the lexer is not automatically bound to an environment.
- Multiple environments can share the same lexer.
- """
-
- def __init__(self, environment):
- # shortcuts
- e = re.escape
-
- def c(x):
- return re.compile(x, re.M | re.S)
-
- # lexing rules for tags
- tag_rules = [
- (whitespace_re, TOKEN_WHITESPACE, None),
- (float_re, TOKEN_FLOAT, None),
- (integer_re, TOKEN_INTEGER, None),
- (name_re, TOKEN_NAME, None),
- (string_re, TOKEN_STRING, None),
- (operator_re, TOKEN_OPERATOR, None),
- ]
-
- # assemble the root lexing rule. because "|" is ungreedy
- # we have to sort by length so that the lexer continues working
- # as expected when we have parsing rules like <% for block and
- # <%= for variables. (if someone wants asp like syntax)
- # variables are just part of the rules if variable processing
- # is required.
- root_tag_rules = compile_rules(environment)
-
- block_start_re = e(environment.block_start_string)
- block_end_re = e(environment.block_end_string)
- comment_end_re = e(environment.comment_end_string)
- variable_end_re = e(environment.variable_end_string)
-
- # block suffix if trimming is enabled
- block_suffix_re = "\\n?" if environment.trim_blocks else ""
-
- # If lstrip is enabled, it should not be applied if there is any
- # non-whitespace between the newline and block.
- self.lstrip_unless_re = c(r"[^ \t]") if environment.lstrip_blocks else None
-
- self.newline_sequence = environment.newline_sequence
- self.keep_trailing_newline = environment.keep_trailing_newline
-
- root_raw_re = (
- fr"(?P<raw_begin>{block_start_re}(\-|\+|)\s*raw\s*"
- fr"(?:\-{block_end_re}\s*|{block_end_re}))"
- )
- root_parts_re = "|".join(
- [root_raw_re] + [fr"(?P<{n}>{r}(\-|\+|))" for n, r in root_tag_rules]
- )
-
- # global lexing rules
- self.rules = {
- "root": [
- # directives
- (
- c(fr"(.*?)(?:{root_parts_re})"),
- OptionalLStrip(TOKEN_DATA, "#bygroup"),
- "#bygroup",
- ),
- # data
- (c(".+"), TOKEN_DATA, None),
- ],
- # comments
- TOKEN_COMMENT_BEGIN: [
- (
- c(
- fr"(.*?)((?:\+{comment_end_re}|\-{comment_end_re}\s*"
- fr"|{comment_end_re}{block_suffix_re}))"
- ),
- (TOKEN_COMMENT, TOKEN_COMMENT_END),
- "#pop",
- ),
- (c(r"(.)"), (Failure("Missing end of comment tag"),), None),
- ],
- # blocks
- TOKEN_BLOCK_BEGIN: [
- (
- c(
- fr"(?:\+{block_end_re}|\-{block_end_re}\s*"
- fr"|{block_end_re}{block_suffix_re})"
- ),
- TOKEN_BLOCK_END,
- "#pop",
- ),
- ]
- + tag_rules,
- # variables
- TOKEN_VARIABLE_BEGIN: [
- (
- c(fr"\-{variable_end_re}\s*|{variable_end_re}"),
- TOKEN_VARIABLE_END,
- "#pop",
- )
- ]
- + tag_rules,
- # raw block
- TOKEN_RAW_BEGIN: [
- (
- c(
- fr"(.*?)((?:{block_start_re}(\-|\+|))\s*endraw\s*"
- fr"(?:\+{block_end_re}|\-{block_end_re}\s*"
- fr"|{block_end_re}{block_suffix_re}))"
- ),
- OptionalLStrip(TOKEN_DATA, TOKEN_RAW_END),
- "#pop",
- ),
- (c(r"(.)"), (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):
- """Replace all newlines with the configured sequence in strings
- and template data.
- """
- 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 == TOKEN_LINESTATEMENT_BEGIN:
- token = TOKEN_BLOCK_BEGIN
- elif token == TOKEN_LINESTATEMENT_END:
- token = TOKEN_BLOCK_END
- # we are not interested in those tokens in the parser
- elif token in (TOKEN_RAW_BEGIN, TOKEN_RAW_END):
- continue
- elif token == TOKEN_DATA:
- value = self._normalize_newlines(value)
- elif token == "keyword":
- token = value
- elif token == TOKEN_NAME:
- value = str(value)
- if not value.isidentifier():
- raise TemplateSyntaxError(
- "Invalid character in identifier", lineno, name, filename
- )
- elif token == 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)
- elif token == TOKEN_INTEGER:
- value = int(value.replace("_", ""))
- elif token == TOKEN_FLOAT:
- # remove all "_" first to support more Python versions
- value = literal_eval(value.replace("_", ""))
- elif token == 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.
- """
- lines = source.splitlines()
- if self.keep_trailing_newline and source:
- if source.endswith(("\r\n", "\r", "\n")):
- lines.append("")
- 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")
- statetokens = self.rules[stack[-1]]
- source_length = len(source)
- balancing_stack = []
- lstrip_unless_re = self.lstrip_unless_re
- newlines_stripped = 0
- line_starting = True
-
- 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 (
- TOKEN_VARIABLE_END,
- TOKEN_BLOCK_END,
- TOKEN_LINESTATEMENT_END,
- ):
- continue
-
- # tuples support more options
- if isinstance(tokens, tuple):
- groups = m.groups()
-
- if isinstance(tokens, OptionalLStrip):
- # Rule supports lstrip. Match will look like
- # text, block type, whitespace control, type, control, ...
- text = groups[0]
-
- # Skipping the text and first type, every other group is the
- # whitespace control for each type. One of the groups will be
- # -, +, or empty string instead of None.
- strip_sign = next(g for g in groups[2::2] if g is not None)
-
- if strip_sign == "-":
- # Strip all whitespace between the text and the tag.
- stripped = text.rstrip()
- newlines_stripped = text[len(stripped) :].count("\n")
- groups = (stripped,) + groups[1:]
- elif (
- # Not marked for preserving whitespace.
- strip_sign != "+"
- # lstrip is enabled.
- and lstrip_unless_re is not None
- # Not a variable expression.
- and not m.groupdict().get(TOKEN_VARIABLE_BEGIN)
- ):
- # The start of text between the last newline and the tag.
- l_pos = text.rfind("\n") + 1
- if l_pos > 0 or line_starting:
- # If there's only whitespace between the newline and the
- # tag, strip it.
- if not lstrip_unless_re.search(text, l_pos):
- groups = (text[:l_pos],) + groups[1:]
-
- 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 m.groupdict().items():
- if value is not None:
- yield lineno, key, value
- lineno += value.count("\n")
- break
- else:
- raise RuntimeError(
- f"{regex!r} wanted to resolve the token dynamically"
- " but no group matched"
- )
- # normal group
- else:
- data = groups[idx]
- if data or token not in ignore_if_empty:
- yield lineno, token, data
- lineno += data.count("\n") + newlines_stripped
- newlines_stripped = 0
-
- # strings as token just are yielded as it.
- else:
- data = m.group()
- # update brace/parentheses balance
- if tokens == TOKEN_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(
- f"unexpected '{data}'", lineno, name, filename
- )
- expected_op = balancing_stack.pop()
- if expected_op != data:
- raise TemplateSyntaxError(
- f"unexpected '{data}', expected '{expected_op}'",
- lineno,
- name,
- filename,
- )
- # yield items
- if data or tokens not in ignore_if_empty:
- yield lineno, tokens, data
- lineno += data.count("\n")
-
- line_starting = m.group()[-1:] == "\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 m.groupdict().items():
- if value is not None:
- stack.append(key)
- break
- else:
- raise RuntimeError(
- f"{regex!r} wanted to resolve the new state dynamically"
- f" but no group matched"
- )
- # 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(
- f"{regex!r} yielded empty string without stack change"
- )
- # 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(
- f"unexpected char {source[pos]!r} at {pos}", lineno, name, filename
- )
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-09 11:01:43 +0000