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diff --git a/pygments/lexers/elm.py b/pygments/lexers/elm.py
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-# -*- coding: utf-8 -*-
-"""
- pygments.lexers.elm
- ~~~~~~~~~~~~~~~~~~~
-
- Lexer for the Elm programming language.
-
- :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
- :license: BSD, see LICENSE for details.
-"""
-
-from pygments.lexer import RegexLexer, words, include
-from pygments.token import Comment, Keyword, Name, Number, Punctuation, String, Text
-
-__all__ = ['ElmLexer']
-
-
-class ElmLexer(RegexLexer):
- """
- For `Elm <http://elm-lang.org/>`_ source code.
-
- .. versionadded:: 2.1
- """
-
- name = 'Elm'
- 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+', Text),
-
- # Strings
- (r'"', String, 'doublequote'),
-
- # Modules
- (r'^\s*module\s*', Keyword.Namespace, 'imports'),
-
- # Imports
- (r'^\s*import\s*', Keyword.Namespace, 'imports'),
-
- # Shaders
- (r'\[glsl\|.*', Name.Entity, 'shader'),
-
- # Keywords
- (reservedWords, Keyword.Reserved),
-
- # Types
- (r'[A-Z]\w*', 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', Name.Entity),
- ],
- }