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# -*- coding: utf-8 -*-
"""
pygments.lexers.graph
~~~~~~~~~~~~~~~~~~~~~
Lexers for graph query languages.
:copyright: Copyright 2006-2019 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
<https://neo4j.com/docs/developer-manual/3.3/cypher/>`_
For the Cypher version in Neo4j 3.3
.. 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|true|false)\b', Keyword),
],
'clauses': [
# based on https://neo4j.com/docs/cypher-refcard/3.3/
(r'(all|any|as|asc|ascending|assert|call|case|create|'
r'create\s+index|create\s+unique|delete|desc|descending|'
r'distinct|drop\s+constraint\s+on|drop\s+index\s+on|end|'
r'ends\s+with|fieldterminator|foreach|in|is\s+node\s+key|'
r'is\s+null|is\s+unique|limit|load\s+csv\s+from|match|merge|none|'
r'not|null|on\s+match|on\s+create|optional\s+match|order\s+by|'
r'remove|return|set|skip|single|start|starts\s+with|then|union|'
r'union\s+all|unwind|using\s+periodic\s+commit|yield|where|when|'
r'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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