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# -*- coding: utf-8 -*-
"""
pygments.lexers.graph
~~~~~~~~~~~~~~~~~~~~~
Lexers for graph query languages.
:copyright: Copyright 2006-2017 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
from pygments.lexer import RegexLexer, include, bygroups, using, this
from pygments.token import Keyword, Punctuation, Comment, Operator, Name,\
String, Number, Whitespace
__all__ = ['CypherLexer']
class CypherLexer(RegexLexer):
"""
For `Cypher Query Language
<http://docs.neo4j.org/chunked/milestone/cypher-query-lang.html>`_
For the Cypher version in Neo4J 2.0
.. versionadded:: 2.0
"""
name = 'Cypher'
aliases = ['cypher']
filenames = ['*.cyp', '*.cypher']
flags = re.MULTILINE | re.IGNORECASE
tokens = {
'root': [
include('comment'),
include('keywords'),
include('clauses'),
include('relations'),
include('strings'),
include('whitespace'),
include('barewords'),
],
'comment': [
(r'^.*//.*\n', Comment.Single),
],
'keywords': [
(r'(create|order|match|limit|set|skip|start|return|with|where|'
r'delete|foreach|not|by)\b', Keyword),
],
'clauses': [
# TODO: many missing ones, see http://docs.neo4j.org/refcard/2.0/
(r'(all|any|as|asc|create|create\s+unique|delete|'
r'desc|distinct|foreach|in|is\s+null|limit|match|none|'
r'order\s+by|return|set|skip|single|start|union|where|with)\b',
Keyword),
],
'relations': [
(r'(-\[)(.*?)(\]->)', bygroups(Operator, using(this), Operator)),
(r'(<-\[)(.*?)(\]-)', bygroups(Operator, using(this), Operator)),
(r'(-\[)(.*?)(\]-)', bygroups(Operator, using(this), Operator)),
(r'-->|<--|\[|\]', Operator),
(r'<|>|<>|=|<=|=>|\(|\)|\||:|,|;', Punctuation),
(r'[.*{}]', Punctuation),
],
'strings': [
(r'"(?:\\[tbnrf\'"\\]|[^\\"])*"', String),
(r'`(?:``|[^`])+`', Name.Variable),
],
'whitespace': [
(r'\s+', Whitespace),
],
'barewords': [
(r'[a-z]\w*', Name),
(r'\d+', Number),
],
}
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