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+"""
+ pygments.lexers.elm
+ ~~~~~~~~~~~~~~~~~~~
+
+ Lexer for the Elm programming language.
+
+ :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
+ :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, words, include, bygroups
+from pygments.token import Comment, Keyword, Name, Number, Punctuation, \
+ String, Whitespace
+
+__all__ = ['ElmLexer']
+
+
+class ElmLexer(RegexLexer):
+ """
+ For Elm source code.
+
+ .. versionadded:: 2.1
+ """
+
+ name = 'Elm'
+ url = 'https://elm-lang.org/'
+ aliases = ['elm']
+ filenames = ['*.elm']
+ mimetypes = ['text/x-elm']
+
+ validName = r'[a-z_][a-zA-Z0-9_\']*'
+
+ specialName = r'^main '
+
+ builtinOps = (
+ '~', '||', '|>', '|', '`', '^', '\\', '\'', '>>', '>=', '>', '==',
+ '=', '<~', '<|', '<=', '<<', '<-', '<', '::', ':', '/=', '//', '/',
+ '..', '.', '->', '-', '++', '+', '*', '&&', '%',
+ )
+
+ reservedWords = words((
+ 'alias', 'as', 'case', 'else', 'if', 'import', 'in',
+ 'let', 'module', 'of', 'port', 'then', 'type', 'where',
+ ), suffix=r'\b')
+
+ tokens = {
+ 'root': [
+
+ # Comments
+ (r'\{-', Comment.Multiline, 'comment'),
+ (r'--.*', Comment.Single),
+
+ # Whitespace
+ (r'\s+', Whitespace),
+
+ # Strings
+ (r'"', String, 'doublequote'),
+
+ # Modules
+ (r'^(\s*)(module)(\s*)', bygroups(Whitespace, Keyword.Namespace,
+ Whitespace), 'imports'),
+
+ # Imports
+ (r'^(\s*)(import)(\s*)', bygroups(Whitespace, Keyword.Namespace,
+ Whitespace), 'imports'),
+
+ # Shaders
+ (r'\[glsl\|.*', Name.Entity, 'shader'),
+
+ # Keywords
+ (reservedWords, Keyword.Reserved),
+
+ # Types
+ (r'[A-Z][a-zA-Z0-9_]*', Keyword.Type),
+
+ # Main
+ (specialName, Keyword.Reserved),
+
+ # Prefix Operators
+ (words((builtinOps), prefix=r'\(', suffix=r'\)'), Name.Function),
+
+ # Infix Operators
+ (words(builtinOps), Name.Function),
+
+ # Numbers
+ include('numbers'),
+
+ # Variable Names
+ (validName, Name.Variable),
+
+ # Parens
+ (r'[,()\[\]{}]', Punctuation),
+
+ ],
+
+ 'comment': [
+ (r'-(?!\})', Comment.Multiline),
+ (r'\{-', Comment.Multiline, 'comment'),
+ (r'[^-}]', Comment.Multiline),
+ (r'-\}', Comment.Multiline, '#pop'),
+ ],
+
+ 'doublequote': [
+ (r'\\u[0-9a-fA-F]{4}', String.Escape),
+ (r'\\[nrfvb\\"]', String.Escape),
+ (r'[^"]', String),
+ (r'"', String, '#pop'),
+ ],
+
+ 'imports': [
+ (r'\w+(\.\w+)*', Name.Class, '#pop'),
+ ],
+
+ 'numbers': [
+ (r'_?\d+\.(?=\d+)', Number.Float),
+ (r'_?\d+', Number.Integer),
+ ],
+
+ 'shader': [
+ (r'\|(?!\])', Name.Entity),
+ (r'\|\]', Name.Entity, '#pop'),
+ (r'(.*)(\n)', bygroups(Name.Entity, Whitespace)),
+ ],
+ }