763 lines
26 KiB
Python
763 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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"""
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pygments.lexer
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~~~~~~~~~~~~~~
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Base lexer classes.
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:copyright: Copyright 2006-2013 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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import re, itertools
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from pygments.filter import apply_filters, Filter
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from pygments.filters import get_filter_by_name
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from pygments.token import Error, Text, Other, _TokenType
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from pygments.util import get_bool_opt, get_int_opt, get_list_opt, \
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make_analysator
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import collections
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__all__ = ['Lexer', 'RegexLexer', 'ExtendedRegexLexer', 'DelegatingLexer',
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'LexerContext', 'include', 'inherit', 'bygroups', 'using', 'this']
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_encoding_map = [('\xef\xbb\xbf', 'utf-8'),
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('\xff\xfe\0\0', 'utf-32'),
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('\0\0\xfe\xff', 'utf-32be'),
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('\xff\xfe', 'utf-16'),
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('\xfe\xff', 'utf-16be')]
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_default_analyse = staticmethod(lambda x: 0.0)
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class LexerMeta(type):
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"""
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This metaclass automagically converts ``analyse_text`` methods into
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static methods which always return float values.
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"""
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def __new__(cls, name, bases, d):
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if 'analyse_text' in d:
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d['analyse_text'] = make_analysator(d['analyse_text'])
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return type.__new__(cls, name, bases, d)
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class Lexer(object, metaclass=LexerMeta):
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"""
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Lexer for a specific language.
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Basic options recognized:
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``stripnl``
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Strip leading and trailing newlines from the input (default: True).
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``stripall``
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Strip all leading and trailing whitespace from the input
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(default: False).
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``ensurenl``
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Make sure that the input ends with a newline (default: True). This
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is required for some lexers that consume input linewise.
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*New in Pygments 1.3.*
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``tabsize``
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If given and greater than 0, expand tabs in the input (default: 0).
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``encoding``
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If given, must be an encoding name. This encoding will be used to
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convert the input string to Unicode, if it is not already a Unicode
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string (default: ``'latin1'``).
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Can also be ``'guess'`` to use a simple UTF-8 / Latin1 detection, or
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``'chardet'`` to use the chardet library, if it is installed.
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"""
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#: Name of the lexer
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name = None
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#: Shortcuts for the lexer
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aliases = []
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#: File name globs
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filenames = []
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#: Secondary file name globs
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alias_filenames = []
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#: MIME types
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mimetypes = []
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#: Priority, should multiple lexers match and no content is provided
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priority = 0
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def __init__(self, **options):
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self.options = options
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self.stripnl = get_bool_opt(options, 'stripnl', True)
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self.stripall = get_bool_opt(options, 'stripall', False)
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self.ensurenl = get_bool_opt(options, 'ensurenl', True)
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self.tabsize = get_int_opt(options, 'tabsize', 0)
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self.encoding = options.get('encoding', 'latin1')
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# self.encoding = options.get('inencoding', None) or self.encoding
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self.filters = []
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for filter_ in get_list_opt(options, 'filters', ()):
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self.add_filter(filter_)
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def __repr__(self):
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if self.options:
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return '<pygments.lexers.%s with %r>' % (self.__class__.__name__,
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self.options)
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else:
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return '<pygments.lexers.%s>' % self.__class__.__name__
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def add_filter(self, filter_, **options):
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"""
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Add a new stream filter to this lexer.
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"""
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if not isinstance(filter_, Filter):
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filter_ = get_filter_by_name(filter_, **options)
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self.filters.append(filter_)
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def analyse_text(text):
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"""
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Has to return a float between ``0`` and ``1`` that indicates
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if a lexer wants to highlight this text. Used by ``guess_lexer``.
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If this method returns ``0`` it won't highlight it in any case, if
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it returns ``1`` highlighting with this lexer is guaranteed.
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The `LexerMeta` metaclass automatically wraps this function so
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that it works like a static method (no ``self`` or ``cls``
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parameter) and the return value is automatically converted to
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`float`. If the return value is an object that is boolean `False`
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it's the same as if the return values was ``0.0``.
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"""
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def get_tokens(self, text, unfiltered=False):
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"""
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Return an iterable of (tokentype, value) pairs generated from
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`text`. If `unfiltered` is set to `True`, the filtering mechanism
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is bypassed even if filters are defined.
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Also preprocess the text, i.e. expand tabs and strip it if
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wanted and applies registered filters.
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"""
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if not isinstance(text, str):
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if self.encoding == 'guess':
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try:
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text = text.decode('utf-8')
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if text.startswith('\ufeff'):
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text = text[len('\ufeff'):]
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except UnicodeDecodeError:
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text = text.decode('latin1')
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elif self.encoding == 'chardet':
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try:
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import chardet
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except ImportError:
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raise ImportError('To enable chardet encoding guessing, '
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'please install the chardet library '
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'from http://chardet.feedparser.org/')
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# check for BOM first
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decoded = None
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for bom, encoding in _encoding_map:
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if text.startswith(bom):
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decoded = str(text[len(bom):], encoding,
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errors='replace')
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break
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# no BOM found, so use chardet
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if decoded is None:
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enc = chardet.detect(text[:1024]) # Guess using first 1KB
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decoded = str(text, enc.get('encoding') or 'utf-8',
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errors='replace')
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text = decoded
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else:
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text = text.decode(self.encoding)
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else:
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if text.startswith('\ufeff'):
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text = text[len('\ufeff'):]
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# text now *is* a unicode string
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text = text.replace('\r\n', '\n')
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text = text.replace('\r', '\n')
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if self.stripall:
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text = text.strip()
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elif self.stripnl:
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text = text.strip('\n')
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if self.tabsize > 0:
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text = text.expandtabs(self.tabsize)
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if self.ensurenl and not text.endswith('\n'):
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text += '\n'
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def streamer():
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for i, t, v in self.get_tokens_unprocessed(text):
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yield t, v
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stream = streamer()
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if not unfiltered:
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stream = apply_filters(stream, self.filters, self)
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return stream
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def get_tokens_unprocessed(self, text):
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"""
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Return an iterable of (tokentype, value) pairs.
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In subclasses, implement this method as a generator to
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maximize effectiveness.
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"""
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raise NotImplementedError
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class DelegatingLexer(Lexer):
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"""
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This lexer takes two lexer as arguments. A root lexer and
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a language lexer. First everything is scanned using the language
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lexer, afterwards all ``Other`` tokens are lexed using the root
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lexer.
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The lexers from the ``template`` lexer package use this base lexer.
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"""
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def __init__(self, _root_lexer, _language_lexer, _needle=Other, **options):
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self.root_lexer = _root_lexer(**options)
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self.language_lexer = _language_lexer(**options)
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self.needle = _needle
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Lexer.__init__(self, **options)
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def get_tokens_unprocessed(self, text):
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buffered = ''
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insertions = []
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lng_buffer = []
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for i, t, v in self.language_lexer.get_tokens_unprocessed(text):
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if t is self.needle:
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if lng_buffer:
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insertions.append((len(buffered), lng_buffer))
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lng_buffer = []
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buffered += v
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else:
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lng_buffer.append((i, t, v))
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if lng_buffer:
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insertions.append((len(buffered), lng_buffer))
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return do_insertions(insertions,
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self.root_lexer.get_tokens_unprocessed(buffered))
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#-------------------------------------------------------------------------------
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# RegexLexer and ExtendedRegexLexer
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#
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class include(str):
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"""
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Indicates that a state should include rules from another state.
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"""
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pass
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class _inherit(object):
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"""
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Indicates the a state should inherit from its superclass.
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"""
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def __repr__(self):
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return 'inherit'
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inherit = _inherit()
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class combined(tuple):
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"""
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Indicates a state combined from multiple states.
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"""
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def __new__(cls, *args):
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return tuple.__new__(cls, args)
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def __init__(self, *args):
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# tuple.__init__ doesn't do anything
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pass
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class _PseudoMatch(object):
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"""
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A pseudo match object constructed from a string.
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"""
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def __init__(self, start, text):
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self._text = text
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self._start = start
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def start(self, arg=None):
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return self._start
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def end(self, arg=None):
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return self._start + len(self._text)
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def group(self, arg=None):
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if arg:
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raise IndexError('No such group')
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return self._text
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def groups(self):
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return (self._text,)
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def groupdict(self):
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return {}
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def bygroups(*args):
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"""
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Callback that yields multiple actions for each group in the match.
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"""
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def callback(lexer, match, ctx=None):
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for i, action in enumerate(args):
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if action is None:
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continue
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elif type(action) is _TokenType:
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data = match.group(i + 1)
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if data:
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yield match.start(i + 1), action, data
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else:
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data = match.group(i + 1)
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if data is not None:
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if ctx:
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ctx.pos = match.start(i + 1)
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for item in action(lexer, _PseudoMatch(match.start(i + 1),
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data), ctx):
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if item:
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yield item
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if ctx:
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ctx.pos = match.end()
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return callback
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class _This(object):
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"""
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Special singleton used for indicating the caller class.
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Used by ``using``.
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"""
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this = _This()
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def using(_other, **kwargs):
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"""
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Callback that processes the match with a different lexer.
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The keyword arguments are forwarded to the lexer, except `state` which
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is handled separately.
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`state` specifies the state that the new lexer will start in, and can
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be an enumerable such as ('root', 'inline', 'string') or a simple
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string which is assumed to be on top of the root state.
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Note: For that to work, `_other` must not be an `ExtendedRegexLexer`.
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"""
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gt_kwargs = {}
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if 'state' in kwargs:
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s = kwargs.pop('state')
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if isinstance(s, (list, tuple)):
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gt_kwargs['stack'] = s
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else:
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gt_kwargs['stack'] = ('root', s)
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if _other is this:
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def callback(lexer, match, ctx=None):
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# if keyword arguments are given the callback
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# function has to create a new lexer instance
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if kwargs:
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# XXX: cache that somehow
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kwargs.update(lexer.options)
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lx = lexer.__class__(**kwargs)
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else:
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lx = lexer
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s = match.start()
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for i, t, v in lx.get_tokens_unprocessed(match.group(), **gt_kwargs):
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yield i + s, t, v
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if ctx:
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ctx.pos = match.end()
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else:
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def callback(lexer, match, ctx=None):
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# XXX: cache that somehow
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kwargs.update(lexer.options)
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lx = _other(**kwargs)
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s = match.start()
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for i, t, v in lx.get_tokens_unprocessed(match.group(), **gt_kwargs):
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yield i + s, t, v
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if ctx:
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ctx.pos = match.end()
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return callback
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class RegexLexerMeta(LexerMeta):
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"""
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Metaclass for RegexLexer, creates the self._tokens attribute from
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self.tokens on the first instantiation.
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"""
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def _process_regex(cls, regex, rflags):
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"""Preprocess the regular expression component of a token definition."""
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return re.compile(regex, rflags).match
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def _process_token(cls, token):
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"""Preprocess the token component of a token definition."""
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assert type(token) is _TokenType or isinstance(token, collections.Callable), \
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'token type must be simple type or callable, not %r' % (token,)
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return token
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def _process_new_state(cls, new_state, unprocessed, processed):
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"""Preprocess the state transition action of a token definition."""
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if isinstance(new_state, str):
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# an existing state
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if new_state == '#pop':
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return -1
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elif new_state in unprocessed:
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return (new_state,)
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elif new_state == '#push':
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return new_state
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elif new_state[:5] == '#pop:':
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return -int(new_state[5:])
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else:
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assert False, 'unknown new state %r' % new_state
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elif isinstance(new_state, combined):
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# combine a new state from existing ones
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tmp_state = '_tmp_%d' % cls._tmpname
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cls._tmpname += 1
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itokens = []
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for istate in new_state:
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assert istate != new_state, 'circular state ref %r' % istate
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itokens.extend(cls._process_state(unprocessed,
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processed, istate))
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processed[tmp_state] = itokens
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return (tmp_state,)
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elif isinstance(new_state, tuple):
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# push more than one state
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for istate in new_state:
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assert (istate in unprocessed or
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istate in ('#pop', '#push')), \
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'unknown new state ' + istate
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return new_state
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else:
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assert False, 'unknown new state def %r' % new_state
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def _process_state(cls, unprocessed, processed, state):
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"""Preprocess a single state definition."""
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assert type(state) is str, "wrong state name %r" % state
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assert state[0] != '#', "invalid state name %r" % state
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if state in processed:
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return processed[state]
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tokens = processed[state] = []
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rflags = cls.flags
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for tdef in unprocessed[state]:
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if isinstance(tdef, include):
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# it's a state reference
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assert tdef != state, "circular state reference %r" % state
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tokens.extend(cls._process_state(unprocessed, processed,
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str(tdef)))
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continue
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if isinstance(tdef, _inherit):
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# processed already
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continue
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assert type(tdef) is tuple, "wrong rule def %r" % tdef
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try:
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rex = cls._process_regex(tdef[0], rflags)
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except Exception as err:
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raise ValueError("uncompilable regex %r in state %r of %r: %s" %
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(tdef[0], state, cls, err))
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token = cls._process_token(tdef[1])
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if len(tdef) == 2:
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new_state = None
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else:
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new_state = cls._process_new_state(tdef[2],
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unprocessed, processed)
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tokens.append((rex, token, new_state))
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return tokens
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def process_tokendef(cls, name, tokendefs=None):
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"""Preprocess a dictionary of token definitions."""
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processed = cls._all_tokens[name] = {}
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tokendefs = tokendefs or cls.tokens[name]
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for state in list(tokendefs.keys()):
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cls._process_state(tokendefs, processed, state)
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return processed
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def get_tokendefs(cls):
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"""
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Merge tokens from superclasses in MRO order, returning a single tokendef
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dictionary.
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Any state that is not defined by a subclass will be inherited
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automatically. States that *are* defined by subclasses will, by
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default, override that state in the superclass. If a subclass wishes to
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inherit definitions from a superclass, it can use the special value
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"inherit", which will cause the superclass' state definition to be
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included at that point in the state.
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"""
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tokens = {}
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inheritable = {}
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for c in itertools.chain((cls,), cls.__mro__):
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toks = c.__dict__.get('tokens', {})
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for state, items in toks.items():
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curitems = tokens.get(state)
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if curitems is None:
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tokens[state] = items
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try:
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inherit_ndx = items.index(inherit)
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except ValueError:
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continue
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inheritable[state] = inherit_ndx
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continue
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inherit_ndx = inheritable.pop(state, None)
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if inherit_ndx is None:
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continue
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# Replace the "inherit" value with the items
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curitems[inherit_ndx:inherit_ndx+1] = items
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try:
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new_inh_ndx = items.index(inherit)
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except ValueError:
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pass
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else:
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inheritable[state] = inherit_ndx + new_inh_ndx
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return tokens
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def __call__(cls, *args, **kwds):
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"""Instantiate cls after preprocessing its token definitions."""
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if '_tokens' not in cls.__dict__:
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cls._all_tokens = {}
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cls._tmpname = 0
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if hasattr(cls, 'token_variants') and cls.token_variants:
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# don't process yet
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pass
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else:
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cls._tokens = cls.process_tokendef('', cls.get_tokendefs())
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return type.__call__(cls, *args, **kwds)
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class RegexLexer(Lexer, metaclass=RegexLexerMeta):
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"""
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Base for simple stateful regular expression-based lexers.
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Simplifies the lexing process so that you need only
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provide a list of states and regular expressions.
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"""
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#: Flags for compiling the regular expressions.
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#: Defaults to MULTILINE.
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flags = re.MULTILINE
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#: Dict of ``{'state': [(regex, tokentype, new_state), ...], ...}``
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#:
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#: The initial state is 'root'.
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#: ``new_state`` can be omitted to signify no state transition.
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#: If it is a string, the state is pushed on the stack and changed.
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#: If it is a tuple of strings, all states are pushed on the stack and
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#: the current state will be the topmost.
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#: It can also be ``combined('state1', 'state2', ...)``
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#: to signify a new, anonymous state combined from the rules of two
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#: or more existing ones.
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#: Furthermore, it can be '#pop' to signify going back one step in
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#: the state stack, or '#push' to push the current state on the stack
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#: again.
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#:
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#: The tuple can also be replaced with ``include('state')``, in which
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#: case the rules from the state named by the string are included in the
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#: current one.
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tokens = {}
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def get_tokens_unprocessed(self, text, stack=('root',)):
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"""
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Split ``text`` into (tokentype, text) pairs.
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``stack`` is the inital stack (default: ``['root']``)
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"""
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pos = 0
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tokendefs = self._tokens
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statestack = list(stack)
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statetokens = tokendefs[statestack[-1]]
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while 1:
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for rexmatch, action, new_state in statetokens:
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m = rexmatch(text, pos)
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if m:
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if type(action) is _TokenType:
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yield pos, action, m.group()
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else:
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for item in action(self, m):
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yield item
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pos = m.end()
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if new_state is not None:
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# state transition
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if isinstance(new_state, tuple):
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for state in new_state:
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if state == '#pop':
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statestack.pop()
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elif state == '#push':
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statestack.append(statestack[-1])
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else:
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statestack.append(state)
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elif isinstance(new_state, int):
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# pop
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del statestack[new_state:]
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elif new_state == '#push':
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statestack.append(statestack[-1])
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else:
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assert False, "wrong state def: %r" % new_state
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statetokens = tokendefs[statestack[-1]]
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break
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else:
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try:
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if text[pos] == '\n':
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# at EOL, reset state to "root"
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statestack = ['root']
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statetokens = tokendefs['root']
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yield pos, Text, '\n'
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pos += 1
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continue
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|
yield pos, Error, text[pos]
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pos += 1
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except IndexError:
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|
break
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|
|
|
|
class LexerContext(object):
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"""
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|
A helper object that holds lexer position data.
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|
"""
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|
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def __init__(self, text, pos, stack=None, end=None):
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|
self.text = text
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|
self.pos = pos
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|
self.end = end or len(text) # end=0 not supported ;-)
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|
self.stack = stack or ['root']
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|
|
|
def __repr__(self):
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|
return 'LexerContext(%r, %r, %r)' % (
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self.text, self.pos, self.stack)
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|
|
|
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class ExtendedRegexLexer(RegexLexer):
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"""
|
|
A RegexLexer that uses a context object to store its state.
|
|
"""
|
|
|
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def get_tokens_unprocessed(self, text=None, context=None):
|
|
"""
|
|
Split ``text`` into (tokentype, text) pairs.
|
|
If ``context`` is given, use this lexer context instead.
|
|
"""
|
|
tokendefs = self._tokens
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if not context:
|
|
ctx = LexerContext(text, 0)
|
|
statetokens = tokendefs['root']
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|
else:
|
|
ctx = context
|
|
statetokens = tokendefs[ctx.stack[-1]]
|
|
text = ctx.text
|
|
while 1:
|
|
for rexmatch, action, new_state in statetokens:
|
|
m = rexmatch(text, ctx.pos, ctx.end)
|
|
if m:
|
|
if type(action) is _TokenType:
|
|
yield ctx.pos, action, m.group()
|
|
ctx.pos = m.end()
|
|
else:
|
|
for item in action(self, m, ctx):
|
|
yield item
|
|
if not new_state:
|
|
# altered the state stack?
|
|
statetokens = tokendefs[ctx.stack[-1]]
|
|
# CAUTION: callback must set ctx.pos!
|
|
if new_state is not None:
|
|
# state transition
|
|
if isinstance(new_state, tuple):
|
|
for state in new_state:
|
|
if state == '#pop':
|
|
ctx.stack.pop()
|
|
elif state == '#push':
|
|
ctx.stack.append(statestack[-1])
|
|
else:
|
|
ctx.stack.append(state)
|
|
elif isinstance(new_state, int):
|
|
# pop
|
|
del ctx.stack[new_state:]
|
|
elif new_state == '#push':
|
|
ctx.stack.append(ctx.stack[-1])
|
|
else:
|
|
assert False, "wrong state def: %r" % new_state
|
|
statetokens = tokendefs[ctx.stack[-1]]
|
|
break
|
|
else:
|
|
try:
|
|
if ctx.pos >= ctx.end:
|
|
break
|
|
if text[ctx.pos] == '\n':
|
|
# at EOL, reset state to "root"
|
|
ctx.stack = ['root']
|
|
statetokens = tokendefs['root']
|
|
yield ctx.pos, Text, '\n'
|
|
ctx.pos += 1
|
|
continue
|
|
yield ctx.pos, Error, text[ctx.pos]
|
|
ctx.pos += 1
|
|
except IndexError:
|
|
break
|
|
|
|
|
|
def do_insertions(insertions, tokens):
|
|
"""
|
|
Helper for lexers which must combine the results of several
|
|
sublexers.
|
|
|
|
``insertions`` is a list of ``(index, itokens)`` pairs.
|
|
Each ``itokens`` iterable should be inserted at position
|
|
``index`` into the token stream given by the ``tokens``
|
|
argument.
|
|
|
|
The result is a combined token stream.
|
|
|
|
TODO: clean up the code here.
|
|
"""
|
|
insertions = iter(insertions)
|
|
try:
|
|
index, itokens = next(insertions)
|
|
except StopIteration:
|
|
# no insertions
|
|
for item in tokens:
|
|
yield item
|
|
return
|
|
|
|
realpos = None
|
|
insleft = True
|
|
|
|
# iterate over the token stream where we want to insert
|
|
# the tokens from the insertion list.
|
|
for i, t, v in tokens:
|
|
# first iteration. store the postition of first item
|
|
if realpos is None:
|
|
realpos = i
|
|
oldi = 0
|
|
while insleft and i + len(v) >= index:
|
|
tmpval = v[oldi:index - i]
|
|
yield realpos, t, tmpval
|
|
realpos += len(tmpval)
|
|
for it_index, it_token, it_value in itokens:
|
|
yield realpos, it_token, it_value
|
|
realpos += len(it_value)
|
|
oldi = index - i
|
|
try:
|
|
index, itokens = next(insertions)
|
|
except StopIteration:
|
|
insleft = False
|
|
break # not strictly necessary
|
|
yield realpos, t, v[oldi:]
|
|
realpos += len(v) - oldi
|
|
|
|
# leftover tokens
|
|
while insleft:
|
|
# no normal tokens, set realpos to zero
|
|
realpos = realpos or 0
|
|
for p, t, v in itokens:
|
|
yield realpos, t, v
|
|
realpos += len(v)
|
|
try:
|
|
index, itokens = next(insertions)
|
|
except StopIteration:
|
|
insleft = False
|
|
break # not strictly necessary
|