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name : carbon.py
 """
    pygments.lexers.carbon
    ~~~~~~~~~~~~~~~~~~~~~~

    Lexers for the Carbon programming language.

    :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""
import re

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

__all__ = ['CarbonLexer']


class CarbonLexer(RegexLexer):
    """
    For Carbon source.

    .. versionadded:: 2.15
    """
    name = 'Carbon'
    url = 'https://github.com/carbon-language/carbon-lang'
    filenames = ['*.carbon']
    aliases = ['carbon']
    mimetypes = ['text/x-carbon']

    flags = re.MULTILINE | re.DOTALL

    tokens = {
        'root': [
            (r'\n', Whitespace),
            (r'\s+', Whitespace),
            (r'\\\n', Text),
            # comments
            (r'//(.*?)\n', Comment.Single),
            (r'/(\\\n)?[*].*?[*](\\\n)?/', Comment.Multiline),
            # Declaration
            (r'(package|import|api|namespace|library)\b', Keyword.Namespace),
            (r'(abstract|alias|fn|class|interface|let|var|virtual|external|'
             r'base|addr|extends|choice|constraint|impl)\b', Keyword.Declaration),
            # Keywords
            (words(('as', 'or', 'not', 'and', 'break', 'continue', 'case',
                    'default', 'if', 'else', 'destructor', 'for', 'forall',
                    'while', 'where', 'then', 'in', 'is', 'return', 'returned',
                    'friend', 'partial', 'private', 'protected', 'observe', 'Self',
                    'override', 'final', 'match', 'type', 'like'), suffix=r'\b'), Keyword),
            (r'(self)\b', Keyword.Pseudo),
            (r'(true|false)\b', Keyword.Constant),
            (r'(auto|bool|string|i8|i16|i32|i64|u8|u16|u32|u64|'
             r'f8|f16|f32|f64)\b', Keyword.Type),
            # numeric literals
            (r'[0-9]*[.][0-9]+', Number.Double),
            (r'0b[01]+', Number.Bin),
            (r'0o[0-7]+', Number.Oct),
            (r'0x[0-9a-fA-F]+', Number.Hex),
            (r'[0-9]+', Number.Integer),
            # string literal
            (r'"(\\.|[^"\\])*"', String),
            # char literal
            (r'\'(\\.|[^\'\\])\'', String.Char),
            # tokens
            (r'<<=|>>=|<<|>>|<=|>=|\+=|-=|\*=|/=|\%=|\|=|&=|\^=|&&|\|\||&|\||'
             r'\+\+|--|\%|\^|\~|==|!=|::|[.]{3}|->|=>|[+\-*/&]', Operator),
            (r'[|<>=!()\[\]{}.,;:\?]', Punctuation),
            # identifiers
            (r'[^\W\d]\w*', Name.Other),
        ]
    }

    def analyse_text(text):
        result = 0
        if 'forall' in text:
            result += 0.1
        if 'type' in text:
            result += 0.1
        if 'Self' in text:
            result += 0.1
        if 'observe' in text:
            result += 0.1
        if 'package' in text:
            result += 0.1
        if 'library' in text:
            result += 0.1
        if 'choice' in text:
            result += 0.1
        if 'addr' in text:
            result += 0.1
        if 'constraint' in text:
            result += 0.1
        if 'impl' in text:
            result += 0.1
        return result
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