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"""
pygments.lexers.elm
~~~~~~~~~~~~~~~~~~~
Lexer for the Elm programming language.
:copyright: Copyright 2006-2025 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.
"""
name = 'Elm'
url = 'https://elm-lang.org/'
aliases = ['elm']
filenames = ['*.elm']
mimetypes = ['text/x-elm']
version_added = '2.1'
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)),
],
}