"""
    pygments.lexers.graphviz
    ~~~~~~~~~~~~~~~~~~~~~~~~

    Lexer for the DOT language (graphviz).

    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

from pygments.lexer import RegexLexer
from pygments.lexer import bygroups
from pygments.token import Comment
from pygments.token import Keyword
from pygments.token import Name
from pygments.token import Number
from pygments.token import Operator
from pygments.token import Punctuation
from pygments.token import String
from pygments.token import Whitespace

__all__ = ['GraphvizLexer']


class GraphvizLexer(RegexLexer):
    """
    For graphviz DOT graph description language.

    .. versionadded:: 2.8
    """
    name = 'Graphviz'
    aliases = ['graphviz', 'dot']
    filenames = ['*.gv', '*.dot']
    mimetypes = ['text/x-graphviz', 'text/vnd.graphviz']
    tokens = {
        'root': [
            (r'\s+', Whitespace),
            (r'(#|//).*?$', Comment.Single),
            (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
            (r'(?i)(node|edge|graph|digraph|subgraph|strict)\b', Keyword),
            (r'--|->', Operator),
            (r'[{}[\]:;,]', Punctuation),
            (r'(\b\D\w*)(\s*)(=)(\s*)',
                bygroups(Name.Attribute, Whitespace, Punctuation, Whitespace),
                'attr_id'),
            (r'\b(n|ne|e|se|s|sw|w|nw|c|_)\b', Name.Builtin),
            (r'\b\D\w*', Name.Tag),  # node
            (r'[-]?((\.[0-9]+)|([0-9]+(\.[0-9]*)?))', Number),
            (r'"(\\"|[^"])*?"', Name.Tag),  # quoted node
            (r'<', Punctuation, 'xml'),
        ],
        'attr_id': [
            (r'\b\D\w*', String, '#pop'),
            (r'[-]?((\.[0-9]+)|([0-9]+(\.[0-9]*)?))', Number, '#pop'),
            (r'"(\\"|[^"])*?"', String.Double, '#pop'),
            (r'<', Punctuation, ('#pop', 'xml')),
        ],
        'xml': [
            (r'<', Punctuation, '#push'),
            (r'>', Punctuation, '#pop'),
            (r'\s+', Whitespace),
            (r'[^<>\s]', Name.Tag),
        ]
    }
