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""" 
    pygments.lexers.diff 
    ~~~~~~~~~~~~~~~~~~~~ 
 
    Lexers for diff/patch formats. 
 
    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details. 
""" 
 
import re

from pygments.lexer import RegexLexer, include, bygroups 
from pygments.token import Text, Comment, Operator, Keyword, Name, Generic, \ 
    Literal, Whitespace
 
__all__ = ['DiffLexer', 'DarcsPatchLexer', 'WDiffLexer']
 
 
class DiffLexer(RegexLexer): 
    """ 
    Lexer for unified or context-style diffs or patches. 
    """ 
 
    name = 'Diff' 
    aliases = ['diff', 'udiff'] 
    filenames = ['*.diff', '*.patch'] 
    mimetypes = ['text/x-diff', 'text/x-patch'] 
 
    tokens = { 
        'root': [ 
            (r'( )(.*)(\n)', bygroups(Whitespace, Text, Whitespace)),
            (r'(\+.*)(\n)', bygroups(Generic.Inserted, Whitespace)),
            (r'(-.*)(\n)', bygroups(Generic.Deleted, Whitespace)),
            (r'(!.*)(\n)', bygroups(Generic.Strong, Whitespace)),
            (r'(@.*)(\n)', bygroups(Generic.Subheading, Whitespace)),
            (r'((?:[Ii]ndex|diff).*)(\n)', bygroups(Generic.Heading, Whitespace)),
            (r'(=.*)(\n)', bygroups(Generic.Heading, Whitespace)),
            (r'(.*)(\n)', Whitespace),
        ] 
    } 
 
    def analyse_text(text): 
        if text[:7] == 'Index: ': 
            return True 
        if text[:5] == 'diff ': 
            return True 
        if text[:4] == '--- ': 
            return 0.9 
 
 
class DarcsPatchLexer(RegexLexer): 
    """ 
    DarcsPatchLexer is a lexer for the various versions of the darcs patch 
    format.  Examples of this format are derived by commands such as 
    ``darcs annotate --patch`` and ``darcs send``. 
 
    .. versionadded:: 0.10 
    """ 
 
    name = 'Darcs Patch' 
    aliases = ['dpatch'] 
    filenames = ['*.dpatch', '*.darcspatch'] 
 
    DPATCH_KEYWORDS = ('hunk', 'addfile', 'adddir', 'rmfile', 'rmdir', 'move', 
                       'replace') 
 
    tokens = { 
        'root': [ 
            (r'<', Operator), 
            (r'>', Operator), 
            (r'\{', Operator), 
            (r'\}', Operator), 
            (r'(\[)((?:TAG )?)(.*)(\n)(.*)(\*\*)(\d+)(\s?)(\])', 
             bygroups(Operator, Keyword, Name, Whitespace, Name, Operator,
                      Literal.Date, Whitespace, Operator)),
            (r'(\[)((?:TAG )?)(.*)(\n)(.*)(\*\*)(\d+)(\s?)', 
             bygroups(Operator, Keyword, Name, Whitespace, Name, Operator,
                      Literal.Date, Whitespace), 'comment'),
            (r'New patches:', Generic.Heading), 
            (r'Context:', Generic.Heading), 
            (r'Patch bundle hash:', Generic.Heading), 
            (r'(\s*)(%s)(.*)(\n)' % '|'.join(DPATCH_KEYWORDS),
                bygroups(Whitespace, Keyword, Text, Whitespace)),
            (r'\+', Generic.Inserted, "insert"), 
            (r'-', Generic.Deleted, "delete"), 
            (r'(.*)(\n)', bygroups(Text, Whitespace)),
        ], 
        'comment': [ 
            (r'[^\]].*\n', Comment), 
            (r'\]', Operator, "#pop"), 
        ], 
        'specialText': [            # darcs add [_CODE_] special operators for clarity 
            (r'\n', Whitespace, "#pop"),  # line-based
            (r'\[_[^_]*_]', Operator), 
        ], 
        'insert': [ 
            include('specialText'), 
            (r'\[', Generic.Inserted), 
            (r'[^\n\[]+', Generic.Inserted), 
        ], 
        'delete': [ 
            include('specialText'), 
            (r'\[', Generic.Deleted), 
            (r'[^\n\[]+', Generic.Deleted), 
        ], 
    } 


class WDiffLexer(RegexLexer):
    """
    A `wdiff <https://www.gnu.org/software/wdiff/>`_ lexer.

    Note that:

    * It only works with normal output (without options like ``-l``).
    * If the target files contain "[-", "-]", "{+", or "+}",
      especially they are unbalanced, the lexer will get confused.

    .. versionadded:: 2.2
    """

    name = 'WDiff'
    aliases = ['wdiff']
    filenames = ['*.wdiff']
    mimetypes = []

    flags = re.MULTILINE | re.DOTALL

    # We can only assume "[-" after "[-" before "-]" is `nested`,
    # for instance wdiff to wdiff outputs. We have no way to
    # distinct these marker is of wdiff output from original text.

    ins_op = r"\{\+"
    ins_cl = r"\+\}"
    del_op = r"\[\-"
    del_cl = r"\-\]"
    normal = r'[^{}[\]+-]+'  # for performance
    tokens = {
        'root': [
            (ins_op, Generic.Inserted, 'inserted'),
            (del_op, Generic.Deleted, 'deleted'),
            (normal, Text),
            (r'.', Text),
        ],
        'inserted': [
            (ins_op, Generic.Inserted, '#push'),
            (del_op, Generic.Inserted, '#push'),
            (del_cl, Generic.Inserted, '#pop'),

            (ins_cl, Generic.Inserted, '#pop'),
            (normal, Generic.Inserted),
            (r'.', Generic.Inserted),
        ],
        'deleted': [
            (del_op, Generic.Deleted, '#push'),
            (ins_op, Generic.Deleted, '#push'),
            (ins_cl, Generic.Deleted, '#pop'),

            (del_cl, Generic.Deleted, '#pop'),
            (normal, Generic.Deleted),
            (r'.', Generic.Deleted),
        ],
    }