1# -*- coding: utf-8 -*-
2"""
3    pygments.lexers.iolang
4    ~~~~~~~~~~~~~~~~~~~~~~
5
6    Lexers for the Io language.
7
8    :copyright: Copyright 2006-2020 by the Pygments team, see AUTHORS.
9    :license: BSD, see LICENSE for details.
10"""
11
12from pygments.lexer import RegexLexer
13from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
14    Number
15
16__all__ = ['IoLexer']
17
18
19class IoLexer(RegexLexer):
20    """
21    For `Io <http://iolanguage.com/>`_ (a small, prototype-based
22    programming language) source.
23
24    .. versionadded:: 0.10
25    """
26    name = 'Io'
27    filenames = ['*.io']
28    aliases = ['io']
29    mimetypes = ['text/x-iosrc']
30    tokens = {
31        'root': [
32            (r'\n', Text),
33            (r'\s+', Text),
34            # Comments
35            (r'//(.*?)\n', Comment.Single),
36            (r'#(.*?)\n', Comment.Single),
37            (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
38            (r'/\+', Comment.Multiline, 'nestedcomment'),
39            # DoubleQuotedString
40            (r'"(\\\\|\\"|[^"])*"', String),
41            # Operators
42            (r'::=|:=|=|\(|\)|;|,|\*|-|\+|>|<|@|!|/|\||\^|\.|%|&|\[|\]|\{|\}',
43             Operator),
44            # keywords
45            (r'(clone|do|doFile|doString|method|for|if|else|elseif|then)\b',
46             Keyword),
47            # constants
48            (r'(nil|false|true)\b', Name.Constant),
49            # names
50            (r'(Object|list|List|Map|args|Sequence|Coroutine|File)\b',
51             Name.Builtin),
52            (r'[a-zA-Z_]\w*', Name),
53            # numbers
54            (r'(\d+\.?\d*|\d*\.\d+)([eE][+-]?[0-9]+)?', Number.Float),
55            (r'\d+', Number.Integer)
56        ],
57        'nestedcomment': [
58            (r'[^+/]+', Comment.Multiline),
59            (r'/\+', Comment.Multiline, '#push'),
60            (r'\+/', Comment.Multiline, '#pop'),
61            (r'[+/]', Comment.Multiline),
62        ]
63    }
64