Cypher.g4

Cypher.g4

/*
 * Copyright (c) 2015-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
grammar Cypher;

cypher : ( SP? cypherPart SP? ';' SP? )*;

cypherPart : ( cypherConsoleCommand | cypherQuery ) ;

cypherConsoleCommand : cypherConsoleCommandName ( SP cypherConsoleCommandParameters )? ;

cypherConsoleCommandName : ':' UnescapedSymbolicName ;

cypherConsoleCommandParameters : cypherConsoleCommandParameter ( SP? ',' SP? cypherConsoleCommandParameter )* ;

cypherConsoleCommandParameter : numberLiteral
                              | StringLiteral
                              | booleanLiteral
                              ;

cypherQuery : queryOptions statement ;

queryOptions : ( anyCypherOption SP? )* ;

anyCypherOption : cypherOption
                | explain
                | profile
                ;

cypherOption : CYPHER ( SP versionNumber )? ( SP configurationOption )* ;

versionNumber : RegularDecimalReal ;

explain : EXPLAIN ;

profile : PROFILE ;

configurationOption : symbolicName SP? '=' SP? symbolicName ;

statement : command
          | query
          ;

query : regularQuery
      | bulkImportQuery
      ;

regularQuery : singleQuery ( SP? union )* ;

bulkImportQuery : periodicCommitHint SP? loadCSVQuery ;

singleQuery : clause ( SP? clause )* ;

periodicCommitHint : USING SP PERIODIC SP COMMIT ( SP integerLiteral )? ;

loadCSVQuery : loadCSVClause ( SP? clause )* ;

union : ( UNION SP ALL SP? singleQuery )
      | ( UNION SP? singleQuery )
      ;

clause : loadCSVClause
       | startClause
       | matchClause
       | unwindClause
       | mergeClause
       | createClause
       | createUniqueClause
       | setClause
       | deleteClause
       | removeClause
       | foreachClause
       | withClause
       | returnClause
       | call
       ;

command : createIndex
        | dropIndex
        | createUniqueConstraint
        | dropUniqueConstraint
        | createNodePropertyExistenceConstraint
        | dropNodePropertyExistenceConstraint
        | createRelationshipPropertyExistenceConstraint
        | dropRelationshipPropertyExistenceConstraint
        ;

createUniqueConstraint : CREATE SP uniqueConstraint ;

createNodePropertyExistenceConstraint : CREATE SP nodePropertyExistenceConstraint ;

createRelationshipPropertyExistenceConstraint : CREATE SP relationshipPropertyExistenceConstraint ;

createIndex : CREATE SP index ;

dropUniqueConstraint : DROP SP uniqueConstraint ;

dropNodePropertyExistenceConstraint : DROP SP nodePropertyExistenceConstraint ;

dropRelationshipPropertyExistenceConstraint : DROP SP relationshipPropertyExistenceConstraint ;

dropIndex : DROP SP index ;

index : INDEX SP ON SP? nodeLabel '(' propertyKeyName ')' ;

uniqueConstraint : CONSTRAINT SP ON SP? '(' variable nodeLabel ')' SP? ASSERT SP propertyExpression SP IS SP UNIQUE ;

nodePropertyExistenceConstraint : CONSTRAINT SP ON SP? '(' variable nodeLabel ')' SP? ASSERT SP EXISTS SP? '(' propertyExpression ')' ;

relationshipPropertyExistenceConstraint : CONSTRAINT SP ON SP? relationshipPatternSyntax SP? ASSERT SP EXISTS SP? '(' propertyExpression ')' ;

relationshipPatternSyntax : ( '(' SP? ')' dash '[' variable relType ']' dash '(' SP? ')' )
                          | ( '(' SP? ')' dash '[' variable relType ']' dash rightArrowHead '(' SP? ')' )
                          | ( '(' SP? ')' leftArrowHead dash '[' variable relType ']' dash '(' SP? ')' )
                          ;

loadCSVClause : LOAD SP CSV SP ( WITH SP HEADERS SP )? FROM SP expression SP AS SP variable SP ( FIELDTERMINATOR SP StringLiteral )? ;

matchClause : ( OPTIONAL SP )? MATCH SP? pattern ( hint )* ( SP? where )? ;

unwindClause : UNWIND SP? expression SP AS SP variable ;

mergeClause : MERGE SP? patternPart ( SP mergeAction )* ;

mergeAction : ( ON SP MATCH SP setClause )
            | ( ON SP CREATE SP setClause )
            ;

createClause : CREATE SP? pattern ;

createUniqueClause : CREATE SP UNIQUE SP? pattern ;

setClause : SET SP? setItem ( ',' setItem )* ;

setItem : ( propertyExpression SP? '=' SP? expression )
        | ( variable SP? '=' SP? expression )
        | ( variable SP? '+=' SP? expression )
        | ( variable SP? nodeLabels )
        ;

deleteClause : ( DETACH SP )? DELETE SP? expression ( SP? ',' SP? expression )* ;

removeClause : REMOVE SP removeItem ( SP? ',' SP? removeItem )* ;

removeItem : ( variable nodeLabels )
           | propertyExpression
           ;

foreachClause : FOREACH SP? '(' SP? variable SP IN SP expression SP? '|' ( SP clause )+ SP? ')' ;

withClause : WITH ( SP? DISTINCT )? SP returnBody ( SP? where )? ;

returnClause : RETURN ( SP? DISTINCT )? SP returnBody ;

returnBody : returnItems ( SP order )? ( SP skip )? ( SP limit )? ;

returnItems : ( '*' ( SP? ',' SP? returnItem )* )
            | ( returnItem ( SP? ',' SP? returnItem )* )
            ;

returnItem : ( expression SP AS SP variable )
           | expression
           ;

call :  CALL SP procedureInvocation SP? procedureResults? ;

procedureInvocation : procedureInvocationBody SP? procedureArguments ;

procedureInvocationBody : namespace procedureName ;

procedureArguments : '(' SP? expression? ( SP? ',' SP? expression )* SP? ')' ;

procedureResults : YIELD SP procedureResult ( SP? ',' SP? procedureResult )* ;

procedureResult : aliasedProcedureResult
                | simpleProcedureResult ;

aliasedProcedureResult : procedureOutput SP AS SP variable ;

simpleProcedureResult : procedureOutput ;

procedureOutput : symbolicName ;

order : ORDER SP BY SP sortItem ( ',' SP? sortItem )* ;

skip : L_SKIP SP expression ;

limit : LIMIT SP expression ;

sortItem : expression ( SP? ( ASCENDING | ASC | DESCENDING | DESC ) SP? )? ;

hint : SP? ( ( USING SP INDEX SP variable nodeLabel '(' propertyKeyName ')' ) | ( USING SP JOIN SP ON SP variable ( SP? ',' SP? variable )* ) | ( USING SP SCAN SP variable nodeLabel ) ) ;

startClause : START SP startPoint ( SP? ',' SP? startPoint )* where? ;

startPoint : variable SP? '=' SP? lookup ;

lookup : nodeLookup
       | relationshipLookup
       ;

nodeLookup : NODE SP? ( identifiedIndexLookup | indexQuery | idLookup ) ;

relationshipLookup : ( RELATIONSHIP | REL ) ( identifiedIndexLookup | indexQuery | idLookup ) ;

identifiedIndexLookup : ':' symbolicName '(' symbolicName '=' ( StringLiteral | parameter ) ')' ;

indexQuery : ':' symbolicName '(' ( StringLiteral | parameter ) ')' ;

idLookup : '(' ( literalIds | parameter | '*' ) ')' ;

literalIds : integerLiteral ( SP? ',' SP? integerLiteral )* ;

where : WHERE SP expression ;

pattern : patternPart ( SP? ',' SP? patternPart )* ;

patternPart : ( variable SP? '=' SP? anonymousPatternPart )
            | anonymousPatternPart
            ;

anonymousPatternPart : shortestPathPattern
                     | patternElement
                     ;

shortestPathPattern : ( SHORTESTPATH '(' patternElement ')' )
                    | ( ALLSHORTESTPATHS '(' patternElement ')' )
                    ;

patternElement : ( nodePattern ( SP? patternElementChain )* )
               | ( '(' patternElement ')' )
               ;

nodePattern : '(' SP? ( variable SP? )? ( nodeLabels SP? )? ( properties SP? )? ')' ;

patternElementChain : relationshipPattern SP? nodePattern ;

relationshipPattern : relationshipPatternStart SP? relationshipDetail? SP? relationshipPatternEnd;

relationshipPatternStart : ( leftArrowHead SP? dash )
                         | ( dash )
                         ;

relationshipPatternEnd : ( dash SP? rightArrowHead )
                       | ( dash )
                       ;

relationshipDetail : '[' SP? ( variable SP? )? ( relationshipTypes SP? )? rangeLiteral? ( properties SP? )? ']' ;

properties : mapLiteral
           | parameter
           ;

relType : ':' SP? relTypeName ;

relationshipTypes : relationshipType ( SP? '|' relationshipTypeOptionalColon )* ;

relationshipType : ':' SP? relTypeName ;

relationshipTypeOptionalColon : ':'? SP? relTypeName ;

nodeLabels : nodeLabel ( SP? nodeLabel )* ;

nodeLabel : ':' SP? labelName ;

rangeLiteral : '*' SP? ( integerLiteral SP? )? ( '..' SP? ( integerLiteral SP? )? )? ;

labelName : symbolicName ;

relTypeName : symbolicName ;

expression : orExpression ;

orExpression : xorExpression ( SP OR SP xorExpression )* ;

xorExpression : andExpression ( SP XOR SP andExpression )* ;

andExpression : notExpression ( SP AND SP notExpression )* ;

notExpression : ( NOT SP? )* comparisonExpression ;

comparisonExpression : addOrSubtractExpression ( SP? partialComparisonExpression )* ;

addOrSubtractExpression : multiplyDivideModuloExpression ( ( SP? '+' SP? multiplyDivideModuloExpression ) | ( SP? '-' SP? multiplyDivideModuloExpression ) )* ;

multiplyDivideModuloExpression : powerOfExpression ( ( SP? '*' SP? powerOfExpression ) | ( SP? '/' SP? powerOfExpression ) | ( SP? '%' SP? powerOfExpression ) )* ;

powerOfExpression : unaryAddOrSubtractExpression ( SP? '^' SP? unaryAddOrSubtractExpression )* ;

unaryAddOrSubtractExpression : ( ( '+' | '-' ) SP? )* stringListNullOperatorExpression ;

stringListNullOperatorExpression : propertyOrLabelsExpression ( ( SP? '[' expression ']' ) | ( SP? '[' expression? '..' expression? ']' ) | ( ( ( SP? '=~' ) | ( SP IN ) | ( SP STARTS SP WITH ) | ( SP ENDS SP WITH ) | ( SP CONTAINS ) ) SP? propertyOrLabelsExpression ) | ( SP IS SP NULL ) | ( SP IS SP NOT SP NULL ) )* ;

propertyOrLabelsExpression : atom ( SP? ( propertyLookup | nodeLabels ) )* ;

atom : literal
     | parameter
     | caseExpression
     | ( COUNT SP? '(' SP? '*' SP? ')' )
     | listComprehension
     | patternComprehension
     | ( FILTER SP? '(' SP? filterExpression SP? ')' )
     | ( EXTRACT SP? '(' SP? filterExpression SP? ( SP? '|' expression )? ')' )
     | reduce
     | ( ALL SP? '(' SP? filterExpression SP? ')' )
     | ( ANY SP? '(' SP? filterExpression SP? ')' )
     | ( NONE SP? '(' SP? filterExpression SP? ')' )
     | ( SINGLE SP? '(' SP? filterExpression SP? ')' )
     | shortestPathPattern
     | relationshipsPattern
     | parenthesizedExpression
     | functionInvocation
     | variable
     ;

literal : numberLiteral
        | StringLiteral
        | booleanLiteral
        | NULL
        | mapLiteral
        | listLiteral
        | mapProjection
        ;

booleanLiteral : TRUE
               | FALSE
               ;

listLiteral : '[' SP? ( expression SP? ( ',' SP? expression SP? )* )? ']' ;

reduce : REDUCE SP? '(' variable '=' expression ',' idInColl '|' expression ')' ;

partialComparisonExpression : ( '=' SP? addOrSubtractExpression )
                            | ( '<>' SP? addOrSubtractExpression )
                            | ( '!=' SP? addOrSubtractExpression )
                            | ( '<' SP? addOrSubtractExpression )
                            | ( '>' SP? addOrSubtractExpression )
                            | ( '<=' SP? addOrSubtractExpression )
                            | ( '>=' SP? addOrSubtractExpression )
                            ;

parenthesizedExpression : '(' SP? expression SP? ')' ;

relationshipsPattern : nodePattern ( SP? patternElementChain )+ ;

filterExpression : idInColl ( SP? where )? ;

idInColl : variable SP IN SP expression ;

functionInvocation : functionInvocationBody SP? '(' SP? ( DISTINCT SP? )? ( expression SP? ( ',' SP? expression SP? )* )? ')' ;

functionInvocationBody : namespace functionName ;

functionName : UnescapedSymbolicName
             | EscapedSymbolicName
             | COUNT ;

procedureName : symbolicName ;

listComprehension : '[' SP? filterExpression ( SP? '|' SP? expression )? SP? ']' ;

patternComprehension : '[' SP? ( variable SP? '=' SP? )? relationshipsPattern SP? ( WHERE SP? expression SP? )? '|' SP? expression SP? ']' ;

propertyLookup : '.' SP? ( propertyKeyName ) ;

caseExpression : ( ( CASE ( SP? caseAlternatives )+ ) | ( CASE SP? expression ( SP? caseAlternatives )+ ) ) ( SP? ELSE SP? expression )? SP? END ;

caseAlternatives : WHEN SP? expression SP? THEN SP? expression ;

variable : symbolicName ;

StringLiteral : ( '"' (~["\\\r\n] | '\\' (. | EOF))* '"' )
              | ( '\'' (~['\\\r\n] | '\\' (. | EOF))* '\'' )
              ;

EscapedChar : '\\' ( '\\' | '\'' | '"' | ( 'B' | 'b' ) | ( 'F' | 'f' ) | ( 'N' | 'n' ) | ( 'R' | 'r' ) | ( 'T' | 't' ) | ( ( 'U' | 'u' ) ( HexDigit HexDigit HexDigit HexDigit ) ) | ( ( 'U' | 'u' ) ( HexDigit HexDigit HexDigit HexDigit HexDigit HexDigit HexDigit HexDigit ) ) ) ;

numberLiteral : doubleLiteral
              | integerLiteral
              ;

mapLiteral : '{' SP? ( propertyKeyName SP? ':' SP? expression SP? ( ',' SP? propertyKeyName SP? ':' SP? expression SP? )* )? '}' ;

mapProjection : variable SP? '{' SP?  mapProjectionVariants? (SP? ',' SP? mapProjectionVariants  )* SP? '}' ;

mapProjectionVariants : ( literalEntry | propertySelector | variableSelector | allPropertiesSelector) ;

literalEntry : propertyKeyName SP? ':' SP? expression ;

propertySelector : '.' variable ;

variableSelector : variable ;

allPropertiesSelector : '.' '*' ;

parameter : legacyParameter
          | newParameter
          ;

legacyParameter : '{' SP? parameterName SP? '}' ;

newParameter : '$' parameterName ;

parameterName : symbolicName
              | DecimalInteger
              ;

propertyExpression : atom ( SP? propertyLookup )+ ;

propertyKeyName : symbolicName ;

integerLiteral : HexInteger
               | OctalInteger
               | DecimalInteger
               ;

HexInteger : '0x' ( HexDigit )+ ;

DecimalInteger : ZeroDigit
               | ( NonZeroDigit ( Digit )* )
               ;

OctalInteger : ZeroDigit ( OctDigit )+ ;

HexLetter : ( 'A' | 'a' )
          | ( 'B' | 'b' )
          | ( 'C' | 'c' )
          | ( 'D' | 'd' )
          | ( 'E' | 'e' )
          | ( 'F' | 'f' )
          ;

HexDigit : Digit
         | HexLetter
         ;

Digit : ZeroDigit
      | NonZeroDigit
      ;

NonZeroDigit : NonZeroOctDigit
             | '8'
             | '9'
             ;

NonZeroOctDigit : '1'
                | '2'
                | '3'
                | '4'
                | '5'
                | '6'
                | '7'
                ;

OctDigit : ZeroDigit
         | NonZeroOctDigit
         ;

ZeroDigit : '0' ;

doubleLiteral : ExponentDecimalReal
              | RegularDecimalReal
              ;

ExponentDecimalReal : ( ( Digit )+ | ( ( Digit )+ '.' ( Digit )+ ) | ( '.' ( Digit )+ ) ) ( ( 'E' | 'e' ) | ( 'E' | 'e' ) ) '-'? ( Digit )+ ;

RegularDecimalReal : ( Digit )* '.' ( Digit )+ ;

namespace : ( symbolicName '.' )* ;
symbolicName : UnescapedSymbolicName
             | EscapedSymbolicName
             | CYPHER
             | EXPLAIN
             | PROFILE
             | USING
             | PERIODIC
             | COMMIT
             | UNION
             | ALL
             | CREATE
             | DROP
             | INDEX
             | ON
             | CONSTRAINT
             | ASSERT
             | IS
             | UNIQUE
             | EXISTS
             | LOAD
             | CSV
             | WITH
             | HEADERS
             | FROM
             | AS
             | FIELDTERMINATOR
             | OPTIONAL
             | MATCH
             | UNWIND
             | MERGE
             | SET
             | DETACH
             | DELETE
             | REMOVE
             | FOREACH
             | IN
             | DISTINCT
             | RETURN
             | ORDER
             | BY
             | L_SKIP
             | LIMIT
             | ASCENDING
             | ASC
             | DESCENDING
             | DESC
             | JOIN
             | SCAN
             | START
             | NODE
             | RELATIONSHIP
             | REL
             | WHERE
             | SHORTESTPATH
             | ALLSHORTESTPATHS
             | OR
             | XOR
             | AND
             | NOT
             | STARTS
             | ENDS
             | CONTAINS
             | NULL
             | COUNT
             | FILTER
             | EXTRACT
             | ANY
             | NONE
             | SINGLE
             | TRUE
             | FALSE
             | REDUCE
             | CASE
             | ELSE
             | END
             | WHEN
             | THEN
             | HexLetter
             | CALL
             | YIELD
             ;

CYPHER : ( 'C' | 'c' ) ( 'Y' | 'y' ) ( 'P' | 'p' ) ( 'H' | 'h' ) ( 'E' | 'e' ) ( 'R' | 'r' )  ;

EXPLAIN : ( 'E' | 'e' ) ( 'X' | 'x' ) ( 'P' | 'p' ) ( 'L' | 'l' ) ( 'A' | 'a' ) ( 'I' | 'i' ) ( 'N' | 'n' )  ;

PROFILE : ( 'P' | 'p' ) ( 'R' | 'r' ) ( 'O' | 'o' ) ( 'F' | 'f' ) ( 'I' | 'i' ) ( 'L' | 'l' ) ( 'E' | 'e' )  ;

USING : ( 'U' | 'u' ) ( 'S' | 's' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'G' | 'g' )  ;

PERIODIC : ( 'P' | 'p' ) ( 'E' | 'e' ) ( 'R' | 'r' ) ( 'I' | 'i' ) ( 'O' | 'o' ) ( 'D' | 'd' ) ( 'I' | 'i' ) ( 'C' | 'c' )  ;

COMMIT : ( 'C' | 'c' ) ( 'O' | 'o' ) ( 'M' | 'm' ) ( 'M' | 'm' ) ( 'I' | 'i' ) ( 'T' | 't' )  ;

UNION : ( 'U' | 'u' ) ( 'N' | 'n' ) ( 'I' | 'i' ) ( 'O' | 'o' ) ( 'N' | 'n' )  ;

ALL : ( 'A' | 'a' ) ( 'L' | 'l' ) ( 'L' | 'l' )  ;

CREATE : ( 'C' | 'c' ) ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'E' | 'e' )  ;

DROP : ( 'D' | 'd' ) ( 'R' | 'r' ) ( 'O' | 'o' ) ( 'P' | 'p' )  ;

INDEX : ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'X' | 'x' )  ;

ON : ( 'O' | 'o' ) ( 'N' | 'n' )  ;

CONSTRAINT : ( 'C' | 'c' ) ( 'O' | 'o' ) ( 'N' | 'n' ) ( 'S' | 's' ) ( 'T' | 't' ) ( 'R' | 'r' ) ( 'A' | 'a' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'T' | 't' )  ;

ASSERT : ( 'A' | 'a' ) ( 'S' | 's' ) ( 'S' | 's' ) ( 'E' | 'e' ) ( 'R' | 'r' ) ( 'T' | 't' )  ;

IS : ( 'I' | 'i' ) ( 'S' | 's' )  ;

UNIQUE : ( 'U' | 'u' ) ( 'N' | 'n' ) ( 'I' | 'i' ) ( 'Q' | 'q' ) ( 'U' | 'u' ) ( 'E' | 'e' )  ;

EXISTS : ( 'E' | 'e' ) ( 'X' | 'x' ) ( 'I' | 'i' ) ( 'S' | 's' ) ( 'T' | 't' ) ( 'S' | 's' )  ;

LOAD : ( 'L' | 'l' ) ( 'O' | 'o' ) ( 'A' | 'a' ) ( 'D' | 'd' )  ;

CSV : ( 'C' | 'c' ) ( 'S' | 's' ) ( 'V' | 'v' )  ;

WITH : ( 'W' | 'w' ) ( 'I' | 'i' ) ( 'T' | 't' ) ( 'H' | 'h' )  ;

HEADERS : ( 'H' | 'h' ) ( 'E' | 'e' ) ( 'A' | 'a' ) ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'R' | 'r' ) ( 'S' | 's' )  ;

FROM : ( 'F' | 'f' ) ( 'R' | 'r' ) ( 'O' | 'o' ) ( 'M' | 'm' )  ;

AS : ( 'A' | 'a' ) ( 'S' | 's' )  ;

FIELDTERMINATOR : ( 'F' | 'f' ) ( 'I' | 'i' ) ( 'E' | 'e' ) ( 'L' | 'l' ) ( 'D' | 'd' ) ( 'T' | 't' ) ( 'E' | 'e' ) ( 'R' | 'r' ) ( 'M' | 'm' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'O' | 'o' ) ( 'R' | 'r' )  ;

OPTIONAL : ( 'O' | 'o' ) ( 'P' | 'p' ) ( 'T' | 't' ) ( 'I' | 'i' ) ( 'O' | 'o' ) ( 'N' | 'n' ) ( 'A' | 'a' ) ( 'L' | 'l' )  ;

MATCH : ( 'M' | 'm' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'C' | 'c' ) ( 'H' | 'h' )  ;

UNWIND : ( 'U' | 'u' ) ( 'N' | 'n' ) ( 'W' | 'w' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'D' | 'd' )  ;

MERGE : ( 'M' | 'm' ) ( 'E' | 'e' ) ( 'R' | 'r' ) ( 'G' | 'g' ) ( 'E' | 'e' )  ;

SET : ( 'S' | 's' ) ( 'E' | 'e' ) ( 'T' | 't' )  ;

DETACH : ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'T' | 't' ) ( 'A' | 'a' ) ( 'C' | 'c' ) ( 'H' | 'h' )  ;

DELETE : ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'L' | 'l' ) ( 'E' | 'e' ) ( 'T' | 't' ) ( 'E' | 'e' )  ;

REMOVE : ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'M' | 'm' ) ( 'O' | 'o' ) ( 'V' | 'v' ) ( 'E' | 'e' )  ;

FOREACH : ( 'F' | 'f' ) ( 'O' | 'o' ) ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'A' | 'a' ) ( 'C' | 'c' ) ( 'H' | 'h' )  ;

IN : ( 'I' | 'i' ) ( 'N' | 'n' )  ;

DISTINCT : ( 'D' | 'd' ) ( 'I' | 'i' ) ( 'S' | 's' ) ( 'T' | 't' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'C' | 'c' ) ( 'T' | 't' )  ;

RETURN : ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'T' | 't' ) ( 'U' | 'u' ) ( 'R' | 'r' ) ( 'N' | 'n' )  ;

ORDER : ( 'O' | 'o' ) ( 'R' | 'r' ) ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'R' | 'r' )  ;

BY : ( 'B' | 'b' ) ( 'Y' | 'y' )  ;

L_SKIP : ( 'S' | 's' ) ( 'K' | 'k' ) ( 'I' | 'i' ) ( 'P' | 'p' )  ;

LIMIT : ( 'L' | 'l' ) ( 'I' | 'i' ) ( 'M' | 'm' ) ( 'I' | 'i' ) ( 'T' | 't' )  ;

ASCENDING : ( 'A' | 'a' ) ( 'S' | 's' ) ( 'C' | 'c' ) ( 'E' | 'e' ) ( 'N' | 'n' ) ( 'D' | 'd' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'G' | 'g' )  ;

ASC : ( 'A' | 'a' ) ( 'S' | 's' ) ( 'C' | 'c' )  ;

DESCENDING : ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'S' | 's' ) ( 'C' | 'c' ) ( 'E' | 'e' ) ( 'N' | 'n' ) ( 'D' | 'd' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'G' | 'g' )  ;

DESC : ( 'D' | 'd' ) ( 'E' | 'e' ) ( 'S' | 's' ) ( 'C' | 'c' )  ;

JOIN : ( 'J' | 'j' ) ( 'O' | 'o' ) ( 'I' | 'i' ) ( 'N' | 'n' )  ;

SCAN : ( 'S' | 's' ) ( 'C' | 'c' ) ( 'A' | 'a' ) ( 'N' | 'n' )  ;

START : ( 'S' | 's' ) ( 'T' | 't' ) ( 'A' | 'a' ) ( 'R' | 'r' ) ( 'T' | 't' )  ;

NODE : ( 'N' | 'n' ) ( 'O' | 'o' ) ( 'D' | 'd' ) ( 'E' | 'e' )  ;

RELATIONSHIP : ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'L' | 'l' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'I' | 'i' ) ( 'O' | 'o' ) ( 'N' | 'n' ) ( 'S' | 's' ) ( 'H' | 'h' ) ( 'I' | 'i' ) ( 'P' | 'p' )  ;

REL : ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'L' | 'l' )  ;

WHERE : ( 'W' | 'w' ) ( 'H' | 'h' ) ( 'E' | 'e' ) ( 'R' | 'r' ) ( 'E' | 'e' )  ;

SHORTESTPATH : ( 'S' | 's' ) ( 'H' | 'h' ) ( 'O' | 'o' ) ( 'R' | 'r' ) ( 'T' | 't' ) ( 'E' | 'e' ) ( 'S' | 's' ) ( 'T' | 't' ) ( 'P' | 'p' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'H' | 'h' )  ;

ALLSHORTESTPATHS : ( 'A' | 'a' ) ( 'L' | 'l' ) ( 'L' | 'l' ) ( 'S' | 's' ) ( 'H' | 'h' ) ( 'O' | 'o' ) ( 'R' | 'r' ) ( 'T' | 't' ) ( 'E' | 'e' ) ( 'S' | 's' ) ( 'T' | 't' ) ( 'P' | 'p' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'H' | 'h' ) ( 'S' | 's' )  ;

OR : ( 'O' | 'o' ) ( 'R' | 'r' )  ;

XOR : ( 'X' | 'x' ) ( 'O' | 'o' ) ( 'R' | 'r' )  ;

AND : ( 'A' | 'a' ) ( 'N' | 'n' ) ( 'D' | 'd' )  ;

NOT : ( 'N' | 'n' ) ( 'O' | 'o' ) ( 'T' | 't' )  ;

STARTS : ( 'S' | 's' ) ( 'T' | 't' ) ( 'A' | 'a' ) ( 'R' | 'r' ) ( 'T' | 't' ) ( 'S' | 's' )  ;

ENDS : ( 'E' | 'e' ) ( 'N' | 'n' ) ( 'D' | 'd' ) ( 'S' | 's' )  ;

CONTAINS : ( 'C' | 'c' ) ( 'O' | 'o' ) ( 'N' | 'n' ) ( 'T' | 't' ) ( 'A' | 'a' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'S' | 's' )  ;

NULL : ( 'N' | 'n' ) ( 'U' | 'u' ) ( 'L' | 'l' ) ( 'L' | 'l' )  ;

COUNT : ( 'C' | 'c' ) ( 'O' | 'o' ) ( 'U' | 'u' ) ( 'N' | 'n' ) ( 'T' | 't' )  ;

FILTER : ( 'F' | 'f' ) ( 'I' | 'i' ) ( 'L' | 'l' ) ( 'T' | 't' ) ( 'E' | 'e' ) ( 'R' | 'r' )  ;

EXTRACT : ( 'E' | 'e' ) ( 'X' | 'x' ) ( 'T' | 't' ) ( 'R' | 'r' ) ( 'A' | 'a' ) ( 'C' | 'c' ) ( 'T' | 't' )  ;

ANY : ( 'A' | 'a' ) ( 'N' | 'n' ) ( 'Y' | 'y' )  ;

NONE : ( 'N' | 'n' ) ( 'O' | 'o' ) ( 'N' | 'n' ) ( 'E' | 'e' )  ;

SINGLE : ( 'S' | 's' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'G' | 'g' ) ( 'L' | 'l' ) ( 'E' | 'e' )  ;

TRUE : ( 'T' | 't' ) ( 'R' | 'r' ) ( 'U' | 'u' ) ( 'E' | 'e' )  ;

FALSE : ( 'F' | 'f' ) ( 'A' | 'a' ) ( 'L' | 'l' ) ( 'S' | 's' ) ( 'E' | 'e' )  ;

REDUCE : ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'D' | 'd' ) ( 'U' | 'u' ) ( 'C' | 'c' ) ( 'E' | 'e' )  ;

CASE : ( 'C' | 'c' ) ( 'A' | 'a' ) ( 'S' | 's' ) ( 'E' | 'e' )  ;

ELSE : ( 'E' | 'e' ) ( 'L' | 'l' ) ( 'S' | 's' ) ( 'E' | 'e' )  ;

END : ( 'E' | 'e' ) ( 'N' | 'n' ) ( 'D' | 'd' )  ;

WHEN : ( 'W' | 'w' ) ( 'H' | 'h' ) ( 'E' | 'e' ) ( 'N' | 'n' )  ;

THEN : ( 'T' | 't' ) ( 'H' | 'h' ) ( 'E' | 'e' ) ( 'N' | 'n' )  ;

CALL : ('C' | 'c') ('A' | 'a') ('L' | 'l') ('L' | 'l')  ;

YIELD : ('Y' | 'y') ('I' | 'i') ('E' | 'e') ('L' | 'l') ('D' | 'd')  ;

UnescapedSymbolicName : IdentifierStart ( IdentifierPart )* ;

/**
 * Based on the unicode identifier and pattern syntax
 *   (http://www.unicode.org/reports/tr31/)
 * And extended with a few characters.
 */
IdentifierStart : ID_Start
                | '_'
                | '‿'
                | '⁀'
                | '⁔'
                | '︳'
                | '︴'
                | '﹍'
                | '﹎'
                | '﹏'
                | '＿'
                ;

/**
 * Based on the unicode identifier and pattern syntax
 *   (http://www.unicode.org/reports/tr31/)
 * And extended with a few characters.
 */
IdentifierPart : ID_Continue
               | Sc
               ;

/**
 * Any character except "`", enclosed within `backticks`. Backticks are escaped with double backticks. */
EscapedSymbolicName : ( '`' (~[`] | '``')* '`' ) ;

SP : ( WHITESPACE )+ ;

WHITESPACE : SPACE
           | TAB
           | LF
           | VT
           | FF
           | CR
           | FS
           | GS
           | RS
           | US
           | ' '
           | '᠎'
           | ' '
           | ' '
           | ' '
           | ' '
           | ' '
           | ' '
           | ' '
           | ' '
           | ' '
           | ' '
           | '
'
           | '
'
           | ' '
           | '　'
           | ' '
           | ' '
           | ' '
           | Comment
           ;

Comment : ( '/*' .*? '*/' )
        | ( '//' ~[\r\n]* )
        ;

leftArrowHead : '<'
              | '⟨'
              | '〈'
              | '﹤'
              | '＜'
              ;

rightArrowHead : '>'
               | '⟩'
               | '〉'
               | '﹥'
               | '＞'
               ;

dash : '-'
     | '­'
     | '‐'
     | '‑'
     | '‒'
     | '–'
     | '—'
     | '―'
     | '−'
     | '﹘'
     | '﹣'
     | '－'
     ;

fragment FF : [\f] ;

fragment RS : [\u001E] ;

fragment ID_Continue : 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41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC] ;

fragment GS : [\u001D] ;

fragment FS : [\u001C] ;

fragment CR : [\r] ;

fragment Sc : [$\u00A2-\u00A5\u058F\u060B\u09F2-\u09F3\u09FB\u0AF1\u0BF9\u0E3F\u17DB\u20A0-\u20BA\uA838\uFDFC\uFE69\uFF04\uFFE0-\uFFE1\uFFE5-\uFFE6] ;

fragment SPACE : [ ] ;

fragment TAB : [\t] ;

fragment LF : [\n] ;

fragment VT : [\u000B] ;

fragment US : [\u001F] ;

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