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# -*- coding: utf-8 -*-
"""
pygments.lexers.go
~~~~~~~~~~~~~~~~~~
Lexers for the Google Go language.
:copyright: Copyright 2006-2017 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
__all__ = ['GoLexer']
class GoLexer(RegexLexer):
"""
For `Go <http://golang.org>`_ source.
.. versionadded:: 1.2
"""
name = 'Go'
filenames = ['*.go']
aliases = ['go']
mimetypes = ['text/x-gosrc']
flags = re.MULTILINE | re.UNICODE
tokens = {
'root': [
(r'\n', Text),
(r'\s+', Text),
(r'\\\n', Text), # line continuations
(r'//(.*?)\n', 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',
'print', 'println', 'panic', 'recover', 'close', 'complex',
'real', 'imag', 'len', 'cap', 'append', 'copy', 'delete',
'new', 'make'), 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'), 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'|<-|\+\+|--|==|!=|:=|\.\.\.|[+\-*/%&])', Operator),
(r'[|^<>=!()\[\]{}.,;:]', Punctuation),
# identifier
(r'[^\W\d]\w*', Name.Other),
]
}
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