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"""

Custom Pygments lexer for highlighting QL code.

Based on instructions from https://pygments.org/docs/lexerdevelopment/.

"""

import re

from pygments.lexer import RegexLexer, words

from pygments.token import Operator, Punctuation, Keyword, Comment, \

Name, Number, String, Text

class QLLexer(RegexLexer):

name = 'QL'

aliases = ['ql']

filenames = ['*.ql','*.qll']

mimetype = ['text/x-ql']

flags = re.MULTILINE

tokens = {

'root': [

(r'\r\n|\r|\n', Text),

(r'\s+', Text),

(r'\"([^\\\"\n\r\t]|\\[\"nrt\\])*\"', String),

(r'[0-9]+(\.[0-9])?', Number),

(r'[,;.()\[\]{}]', Punctuation),

# Comments (one-line, multiline, and QLDoc)

(r'\/\/.*$', Comment.Single),

(r'\/\*([^\*][\s\S]*?)?\*\/', Comment.Multiline),

(r'\/\*(?!\*\/)\*[\s\S]*?\*\/', Comment.Preproc),

# Operators

(r'<=|>=|!=|\.\.|::|[<>=\-\/*%+|]', Operator),

# Keywords

(r'\b(boolean|date|float|int|string)\b', Keyword.Type),

(r'\b(abstract|cached|deprecated|external|final|library|override|private|query'

r'|(pragma|language|bindingset|overlay)\[\w*\??(,\s*\w*\??)*\])\s',

Keyword.Reserved),

(words((

'and', 'any', 'as', 'asc', 'avg', 'by', 'class','concat', 'count',

'desc', 'else', 'exists', 'extends', 'false', 'forall',

'forex', 'from', 'if', 'implies', 'import', 'in', 'instanceof',

'max', 'min', 'module', 'newtype', 'not', 'none', 'or', 'order',

'predicate', 'rank', 'result', 'select', 'strictconcat',

'strictcount', 'strictsum', 'sum', 'super', 'then', 'this',

'true', 'unique', 'where'), prefix=r'\b', suffix=r'\b'),

Keyword),

# Identifiers

(r'@?\w', Name),

]

}