1"""
2 pygments.lexers.eiffel
3 ~~~~~~~~~~~~~~~~~~~~~~
4
5 Lexer for the Eiffel language.
6
7 :copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
8 :license: BSD, see LICENSE for details.
9"""
10
11from pygments.lexer import RegexLexer, include, words, bygroups
12from pygments.token import Comment, Operator, Keyword, Name, String, Number, \
13 Punctuation, Whitespace
14
15__all__ = ['EiffelLexer']
16
17
18class EiffelLexer(RegexLexer):
19 """
20 For Eiffel source code.
21 """
22 name = 'Eiffel'
23 url = 'https://www.eiffel.com'
24 aliases = ['eiffel']
25 filenames = ['*.e']
26 mimetypes = ['text/x-eiffel']
27 version_added = '2.0'
28
29 tokens = {
30 'root': [
31 (r'[^\S\n]+', Whitespace),
32 (r'--.*?$', Comment.Single),
33 (r'[^\S\n]+', Whitespace),
34 # Please note that keyword and operator are case insensitive.
35 (r'(?i)(true|false|void|current|result|precursor)\b', Keyword.Constant),
36 (r'(?i)(not|xor|implies|or)\b', Operator.Word),
37 (r'(?i)(and)(?:(\s+)(then))?\b',
38 bygroups(Operator.Word, Whitespace, Operator.Word)),
39 (r'(?i)(or)(?:(\s+)(else))?\b',
40 bygroups(Operator.Word, Whitespace, Operator.Word)),
41 (words((
42 'across', 'agent', 'alias', 'all', 'as', 'assign', 'attached',
43 'attribute', 'check', 'class', 'convert', 'create', 'debug',
44 'deferred', 'detachable', 'do', 'else', 'elseif', 'end', 'ensure',
45 'expanded', 'export', 'external', 'feature', 'from', 'frozen', 'if',
46 'inherit', 'inspect', 'invariant', 'like', 'local', 'loop', 'none',
47 'note', 'obsolete', 'old', 'once', 'only', 'redefine', 'rename',
48 'require', 'rescue', 'retry', 'select', 'separate', 'then',
49 'undefine', 'until', 'variant', 'when'), prefix=r'(?i)\b', suffix=r'\b'),
50 Keyword.Reserved),
51 (r'"\[([^\]%]|%(.|\n)|\][^"])*?\]"', String),
52 (r'"([^"%\n]|%.)*?"', String),
53 include('numbers'),
54 (r"'([^'%]|%'|%%)'", String.Char),
55 (r"(//|\\\\|>=|<=|:=|/=|~|/~|[\\?!#%&@|+/\-=>*$<^\[\]])", Operator),
56 (r"([{}():;,.])", Punctuation),
57 (r'([a-z]\w*)|([A-Z][A-Z0-9_]*[a-z]\w*)', Name),
58 (r'([A-Z][A-Z0-9_]*)', Name.Class),
59 (r'\n+', Whitespace),
60 ],
61 'numbers': [
62 (r'0[xX][a-fA-F0-9]+', Number.Hex),
63 (r'0[bB][01]+', Number.Bin),
64 (r'0[cC][0-7]+', Number.Oct),
65 (r'([0-9]+\.[0-9]*)|([0-9]*\.[0-9]+)', Number.Float),
66 (r'[0-9]+', Number.Integer),
67 ],
68 }