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"""
pygments.lexers.carbon
~~~~~~~~~~~~~~~~~~~~~~
Lexers for the Carbon programming language.
:copyright: Copyright 2006-2024 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
from pygments.lexer import RegexLexer, words
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
Number, Punctuation, Whitespace
__all__ = ['CarbonLexer']
class CarbonLexer(RegexLexer):
"""
For Carbon source.
"""
name = 'Carbon'
url = 'https://github.com/carbon-language/carbon-lang'
filenames = ['*.carbon']
aliases = ['carbon']
mimetypes = ['text/x-carbon']
version_added = '2.15'
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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