Mercurial Repositories > eric / file revision

# -*- coding: utf-8 -*-
"""
    pygments.lexers.go
    ~~~~~~~~~~~~~~~~~~

    Lexers for the Google Go language.

    :copyright: Copyright 2006-2020 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),
        ]
    }