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""" |
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pygments.lexers.elm |
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~~~~~~~~~~~~~~~~~~~ |
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Lexer for the Elm programming language. |
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:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS. |
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:license: BSD, see LICENSE for details. |
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""" |
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from pygments.lexer import RegexLexer, words, include, bygroups |
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from pygments.token import Comment, Keyword, Name, Number, Punctuation, \ |
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String, Whitespace |
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__all__ = ['ElmLexer'] |
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class ElmLexer(RegexLexer): |
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""" |
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For Elm source code. |
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""" |
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name = 'Elm' |
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url = 'https://elm-lang.org/' |
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aliases = ['elm'] |
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filenames = ['*.elm'] |
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mimetypes = ['text/x-elm'] |
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version_added = '2.1' |
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validName = r'[a-z_][a-zA-Z0-9_\']*' |
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specialName = r'^main ' |
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builtinOps = ( |
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'~', '||', '|>', '|', '`', '^', '\\', '\'', '>>', '>=', '>', '==', |
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'=', '<~', '<|', '<=', '<<', '<-', '<', '::', ':', '/=', '//', '/', |
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'..', '.', '->', '-', '++', '+', '*', '&&', '%', |
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) |
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reservedWords = words(( |
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'alias', 'as', 'case', 'else', 'if', 'import', 'in', |
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'let', 'module', 'of', 'port', 'then', 'type', 'where', |
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), suffix=r'\b') |
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tokens = { |
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'root': [ |
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(r'\{-', Comment.Multiline, 'comment'), |
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(r'--.*', Comment.Single), |
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(r'\s+', Whitespace), |
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(r'"', String, 'doublequote'), |
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(r'^(\s*)(module)(\s*)', bygroups(Whitespace, Keyword.Namespace, |
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Whitespace), 'imports'), |
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(r'^(\s*)(import)(\s*)', bygroups(Whitespace, Keyword.Namespace, |
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Whitespace), 'imports'), |
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(r'\[glsl\|.*', Name.Entity, 'shader'), |
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(reservedWords, Keyword.Reserved), |
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(r'[A-Z][a-zA-Z0-9_]*', Keyword.Type), |
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(specialName, Keyword.Reserved), |
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(words((builtinOps), prefix=r'\(', suffix=r'\)'), Name.Function), |
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(words(builtinOps), Name.Function), |
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include('numbers'), |
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(validName, Name.Variable), |
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(r'[,()\[\]{}]', Punctuation), |
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], |
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'comment': [ |
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(r'-(?!\})', Comment.Multiline), |
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(r'\{-', Comment.Multiline, 'comment'), |
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(r'[^-}]', Comment.Multiline), |
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(r'-\}', Comment.Multiline, '#pop'), |
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], |
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'doublequote': [ |
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(r'\\u[0-9a-fA-F]{4}', String.Escape), |
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(r'\\[nrfvb\\"]', String.Escape), |
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(r'[^"]', String), |
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(r'"', String, '#pop'), |
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], |
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'imports': [ |
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(r'\w+(\.\w+)*', Name.Class, '#pop'), |
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], |
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'numbers': [ |
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(r'_?\d+\.(?=\d+)', Number.Float), |
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(r'_?\d+', Number.Integer), |
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], |
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'shader': [ |
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(r'\|(?!\])', Name.Entity), |
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(r'\|\]', Name.Entity, '#pop'), |
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(r'(.*)(\n)', bygroups(Name.Entity, Whitespace)), |
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], |
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} |
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