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"""
pygments.lexers.graph
~~~~~~~~~~~~~~~~~~~~~
Lexers for graph query languages.
:copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
from pygments.lexer import RegexLexer, include, bygroups, using, this, words
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('clauses'),
include('keywords'),
include('relations'),
include('strings'),
include('whitespace'),
include('barewords'),
],
'comment': [
(r'^.*//.*$', 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'(create)(\s+)(index|unique)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(drop)(\s+)(contraint|index)(\s+)(on)\b',
bygroups(Keyword, Whitespace, Keyword, Whitespace, Keyword)),
(r'(ends)(\s+)(with)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(is)(\s+)(node)(\s+)(key)\b',
bygroups(Keyword, Whitespace, Keyword, Whitespace, Keyword)),
(r'(is)(\s+)(null|unique)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(load)(\s+)(csv)(\s+)(from)\b',
bygroups(Keyword, Whitespace, Keyword, Whitespace, Keyword)),
(r'(on)(\s+)(match|create)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(optional)(\s+)(match)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(order)(\s+)(by)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(starts)(\s+)(with)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(union)(\s+)(all)\b',
bygroups(Keyword, Whitespace, Keyword)),
(r'(using)(\s+)(periodic)(\s+)(commit)\b',
bygroups(Keyword, Whitespace, Keyword, Whitespace, Keyword)),
(words((
'all', 'any', 'as', 'asc', 'ascending', 'assert', 'call', 'case', 'create',
'delete', 'desc', 'descending', 'distinct', 'end', 'fieldterminator',
'foreach', 'in', 'limit', 'match', 'merge', 'none', 'not', 'null',
'remove', 'return', 'set', 'skip', 'single', 'start', 'then', 'union',
'unwind', 'yield', 'where', 'when', 'with'), suffix=r'\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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