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File Name : scanner.py

"""
    pygments.scanner
    ~~~~~~~~~~~~~~~~

This library implements a regex based scanner. Some languages
    like Pascal are easy to parse but have some keywords that
    depend on the context. Because of this it's impossible to lex
    that just by using a regular expression lexer like the
    `RegexLexer`.

Have a look at the `DelphiLexer` to get an idea of how to use
    this scanner.

:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""
import re

class EndOfText(RuntimeError):
    """
    Raise if end of text is reached and the user
    tried to call a match function.
    """

class Scanner:
    """
    Simple scanner

All method patterns are regular expression strings (not
    compiled expressions!)
    """

def __init__(self, text, flags=0):
        """
        :param text:    The text which should be scanned
        :param flags:   default regular expression flags
        """
        self.data = text
        self.data_length = len(text)
        self.start_pos = 0
        self.pos = 0
        self.flags = flags
        self.last = None
        self.match = None
        self._re_cache = {}

def eos(self):
        """`True` if the scanner reached the end of text."""
        return self.pos >= self.data_length
    eos = property(eos, eos.__doc__)

def check(self, pattern):
        """
        Apply `pattern` on the current position and return
        the match object. (Doesn't touch pos). Use this for
        lookahead.
        """
        if self.eos:
            raise EndOfText()
        if pattern not in self._re_cache:
            self._re_cache[pattern] = re.compile(pattern, self.flags)
        return self._re_cache[pattern].match(self.data, self.pos)

def test(self, pattern):
        """Apply a pattern on the current position and check
        if it patches. Doesn't touch pos.
        """
        return self.check(pattern) is not None

def scan(self, pattern):
        """
        Scan the text for the given pattern and update pos/match
        and related fields. The return value is a boolean that
        indicates if the pattern matched. The matched value is
        stored on the instance as ``match``, the last value is
        stored as ``last``. ``start_pos`` is the position of the
        pointer before the pattern was matched, ``pos`` is the
        end position.
        """
        if self.eos:
            raise EndOfText()
        if pattern not in self._re_cache:
            self._re_cache[pattern] = re.compile(pattern, self.flags)
        self.last = self.match
        m = self._re_cache[pattern].match(self.data, self.pos)
        if m is None:
            return False
        self.start_pos = m.start()
        self.pos = m.end()
        self.match = m.group()
        return True

def get_char(self):
        """Scan exactly one char."""
        self.scan('.')

def __repr__(self):
        return '<%s %d/%d>' % (
            self.__class__.__name__,
            self.pos,
            self.data_length
        )

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-12-03 09:30:28
..	dir	-	root/root	0755	2025-12-03 09:30:28
__pycache__	dir	-	root/root	0755	2025-12-03 09:30:28
filters	dir	-	root/root	0755	2025-12-03 09:30:28
formatters	dir	-	root/root	0755	2025-12-03 09:30:28
lexers	dir	-	root/root	0755	2025-12-03 09:30:28
styles	dir	-	root/root	0755	2025-12-03 09:30:28
LICENSE	text/plain	1.3 KB	root/root	0644	2025-12-03 09:30:28
__init__.py	text/plain	2.91 KB	root/root	0644	2025-12-03 09:30:28
__main__.py	text/plain	353 B	root/root	0644	2025-12-03 09:30:28
console.py	text/plain	1.68 KB	root/root	0644	2025-12-03 09:30:28
filter.py	text/plain	1.87 KB	root/root	0644	2025-12-03 09:30:28
formatter.py	text/plain	4.29 KB	root/root	0644	2025-12-03 09:30:28
lexer.py	text/plain	34.52 KB	root/root	0644	2025-12-03 09:30:28
modeline.py	text/plain	1005 B	root/root	0644	2025-12-03 09:30:28
plugin.py	text/plain	1.85 KB	root/root	0644	2025-12-03 09:30:28
regexopt.py	text/plain	3 KB	root/root	0644	2025-12-03 09:30:28
scanner.py	text/plain	3.02 KB	root/root	0644	2025-12-03 09:30:28
sphinxext.py	text/plain	7.79 KB	root/root	0644	2025-12-03 09:30:28
style.py	text/plain	6.27 KB	root/root	0644	2025-12-03 09:30:28
token.py	text/plain	6.08 KB	root/root	0644	2025-12-03 09:30:28
unistring.py	text/plain	61.73 KB	root/root	0644	2025-12-03 09:30:28
util.py	text/plain	9.8 KB	root/root	0644	2025-12-03 09:30:28

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