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"""
pygments.lexers.go
~~~~~~~~~~~~~~~~~~
Lexers for the Google Go language.
:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from pygments.lexer import RegexLexer, bygroups, words
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
Number, Punctuation, Whitespace
__all__ = ['GoLexer']
class GoLexer(RegexLexer):
"""
For Go source.
"""
name = 'Go'
url = 'https://go.dev/'
filenames = ['*.go']
aliases = ['go', 'golang']
mimetypes = ['text/x-gosrc']
version_added = '1.2'
tokens = {
'root': [
(r'\n', Whitespace),
(r'\s+', Whitespace),
(r'(\\)(\n)', bygroups(Text, Whitespace)), # line continuations
(r'//(.*?)$', Comment.Single),
(r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
(r'(import|package)\b', Keyword.Namespace),
(r'(var|func|struct|map|chan|type|interface|const)\b',
Keyword.Declaration),
(words((
'break', 'default', 'select', 'case', 'defer', 'go',
'else', 'goto', 'switch', 'fallthrough', 'if', 'range',
'continue', 'for', 'return'), suffix=r'\b'),
Keyword),
(r'(true|false|iota|nil)\b', Keyword.Constant),
# It seems the builtin types aren't actually keywords, but
# can be used as functions. So we need two declarations.
(words((
'uint', 'uint8', 'uint16', 'uint32', 'uint64',
'int', 'int8', 'int16', 'int32', 'int64',
'float', 'float32', 'float64',
'complex64', 'complex128', 'byte', 'rune',
'string', 'bool', 'error', 'uintptr', 'any', 'comparable',
'print', 'println', 'panic', 'recover', 'close', 'complex',
'real', 'imag', 'len', 'cap', 'append', 'copy', 'delete',
'new', 'make', 'min', 'max', 'clear'), suffix=r'\b(\()'),
bygroups(Name.Builtin, Punctuation)),
(words((
'uint', 'uint8', 'uint16', 'uint32', 'uint64',
'int', 'int8', 'int16', 'int32', 'int64',
'float', 'float32', 'float64',
'complex64', 'complex128', 'byte', 'rune',
'string', 'bool', 'error', 'uintptr', 'any', 'comparable'), suffix=r'\b'),
Keyword.Type),
# imaginary_lit
(r'\d+i', Number),
(r'\d+\.\d*([Ee][-+]\d+)?i', Number),
(r'\.\d+([Ee][-+]\d+)?i', Number),
(r'\d+[Ee][-+]\d+i', Number),
# float_lit
(r'\d+(\.\d+[eE][+\-]?\d+|'
r'\.\d*|[eE][+\-]?\d+)', Number.Float),
(r'\.\d+([eE][+\-]?\d+)?', Number.Float),
# int_lit
# -- octal_lit
(r'0[0-7]+', Number.Oct),
# -- hex_lit
(r'0[xX][0-9a-fA-F]+', Number.Hex),
# -- decimal_lit
(r'(0|[1-9][0-9]*)', Number.Integer),
# char_lit
(r"""'(\\['"\\abfnrtv]|\\x[0-9a-fA-F]{2}|\\[0-7]{1,3}"""
r"""|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|[^\\])'""",
String.Char),
# StringLiteral
# -- raw_string_lit
(r'`[^`]*`', String),
# -- interpreted_string_lit
(r'"(\\\\|\\[^\\]|[^"\\])*"', String),
# Tokens
(r'(<<=|>>=|<<|>>|<=|>=|&\^=|&\^|\+=|-=|\*=|/=|%=|&=|\|=|&&|\|\|'
r'|<-|\+\+|--|==|!=|:=|\.\.\.|[+\-*/%&]'
r'|~|\|)', Operator),
(r'[|^<>=!()\[\]{}.,;:]', Punctuation),
# identifier
(r'[^\W\d]\w*', Name.Other),
]
}