jeffreylovitz/Cypher.g4

## Cypher.g4
/**
 * Copyright (c) 2015-2020 "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.
 *
 * Attribution Notice under the terms of the Apache License 2.0
 *
 * This work was created by the collective efforts of the openCypher community.
 * Without limiting the terms of Section 6, any Derivative Work that is not
 * approved by the public consensus process of the openCypher Implementers Group
 * should not be described as “Cypher” (and Cypher® is a registered trademark of
 * Neo4j Inc.) or as "openCypher". Extensions by implementers or prototypes or
 * proposals for change that have been documented or implemented should only be
 * described as "implementation extensions to Cypher" or as "proposed changes to
 * Cypher that are not yet approved by the openCypher community".
 */
grammar Cypher;

oC_Cypher
      :  SP? oC_Statement ( SP? ';' )? SP? EOF ;

oC_Statement
         :  oC_Query ;

oC_Query
     :  oC_RegularQuery
         | oC_StandaloneCall
         ;

oC_RegularQuery
            :  oC_SingleQuery ( SP? oC_Union )* ;

oC_Union
     :  ( UNION SP ALL SP? oC_SingleQuery )
         | ( UNION SP? oC_SingleQuery )
         ;

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

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

oC_SingleQuery
           :  oC_SinglePartQuery
               | oC_MultiPartQuery
               ;

oC_SinglePartQuery
               :  ( ( oC_ReadingClause SP? )* oC_Return )
                   | ( ( oC_ReadingClause SP? )* oC_UpdatingClause ( SP? oC_UpdatingClause )* ( SP? oC_Return )? )
                   ;

oC_MultiPartQuery
              :  ( ( oC_ReadingClause SP? )* ( oC_UpdatingClause SP? )* oC_With SP? )+ oC_SinglePartQuery ;

oC_UpdatingClause
              :  oC_Create
                  | oC_Merge
                  | oC_Delete
                  | oC_Set
                  | oC_Remove
                  ;

oC_ReadingClause
             :  oC_Match
                 | oC_Unwind
                 | oC_InQueryCall
                 ;

oC_Match
     :  ( OPTIONAL SP )? MATCH SP? oC_Pattern ( SP? oC_Where )? ;

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' )  ;

oC_Unwind
      :  UNWIND SP? oC_Expression SP AS SP oC_Variable ;

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

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

oC_Merge
     :  MERGE SP? oC_PatternPart ( SP oC_MergeAction )* ;

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

oC_MergeAction
           :  ( ON SP MATCH SP oC_Set )
               | ( ON SP CREATE SP oC_Set )
               ;

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

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

oC_Create
      :  CREATE SP? oC_Pattern ;

oC_Set
   :  SET SP? oC_SetItem ( ',' oC_SetItem )* ;

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

oC_SetItem
       :  ( oC_PropertyExpression SP? '=' SP? oC_Expression )
           | ( oC_Variable SP? '=' SP? oC_Expression )
           | ( oC_Variable SP? '+=' SP? oC_Expression )
           | ( oC_Variable SP? oC_NodeLabels )
           ;

oC_Delete
      :  ( DETACH SP )? DELETE SP? oC_Expression ( SP? ',' SP? oC_Expression )* ;

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' )  ;

oC_Remove
      :  REMOVE SP oC_RemoveItem ( SP? ',' SP? oC_RemoveItem )* ;

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

oC_RemoveItem
          :  ( oC_Variable oC_NodeLabels )
              | oC_PropertyExpression
              ;

oC_InQueryCall
           :  CALL SP oC_ExplicitProcedureInvocation ( SP? YIELD SP oC_YieldItems )? ;

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

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

oC_StandaloneCall
              :  CALL SP ( oC_ExplicitProcedureInvocation | oC_ImplicitProcedureInvocation ) ( SP YIELD SP oC_YieldItems )? ;

oC_YieldItems
          :  ( '*' | ( oC_YieldItem ( SP? ',' SP? oC_YieldItem )* ) ) ( SP? oC_Where )? ;

oC_YieldItem
         :  ( oC_ProcedureResultField SP AS SP )? oC_Variable ;

oC_With
    :  WITH oC_ProjectionBody ( SP? oC_Where )? ;

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

oC_Return
      :  RETURN oC_ProjectionBody ;

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

oC_ProjectionBody
              :  ( SP? DISTINCT )? SP oC_ProjectionItems ( SP oC_Order )? ( SP oC_Skip )? ( SP oC_Limit )? ;

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

oC_ProjectionItems
               :  ( '*' ( SP? ',' SP? oC_ProjectionItem )* )
                   | ( oC_ProjectionItem ( SP? ',' SP? oC_ProjectionItem )* )
                   ;

oC_ProjectionItem
              :  ( oC_Expression SP AS SP oC_Variable )
                  | oC_Expression
                  ;

oC_Order
     :  ORDER SP BY SP oC_SortItem ( ',' SP? oC_SortItem )* ;

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

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

oC_Skip
    :  L_SKIP SP oC_Expression ;

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

oC_Limit
     :  LIMIT SP oC_Expression ;

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

oC_SortItem
        :  oC_Expression ( SP? ( ASCENDING | ASC | DESCENDING | DESC ) )? ;

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' )  ;

oC_Where
     :  WHERE SP oC_Expression ;

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

oC_Pattern
       :  oC_PatternPart ( SP? ',' SP? oC_PatternPart )* ;

oC_PatternPart
           :  ( oC_Variable SP? '=' SP? oC_AnonymousPatternPart )
               | oC_AnonymousPatternPart
               ;

oC_AnonymousPatternPart
                    :  oC_PatternElement ;

oC_PatternElement
              :  ( oC_NodePattern ( SP? oC_PatternElementChain )* )
                  | ( '(' oC_PatternElement ')' )
                  ;

oC_NodePattern
           :  '(' SP? ( oC_Variable SP? )? ( oC_NodeLabels SP? )? ( oC_Properties SP? )? ')' ;

oC_PatternElementChain
                   :  oC_RelationshipPattern SP? oC_NodePattern ;

oC_RelationshipPattern
                   :  ( oC_LeftArrowHead SP? oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash SP? oC_RightArrowHead )
                       | ( oC_LeftArrowHead SP? oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash )
                       | ( oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash SP? oC_RightArrowHead )
                       | ( oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash )
                       ;

oC_RelationshipDetail
                  :  '[' SP? ( oC_Variable SP? )? ( oC_RelationshipTypes SP? )? oC_RangeLiteral? ( oC_Properties SP? )? ']' ;

oC_Properties
          :  oC_MapLiteral
              | oC_Parameter
              ;

oC_RelationshipTypes
                 :  ':' SP? oC_RelTypeName ( SP? '|' ':'? SP? oC_RelTypeName )* ;

oC_NodeLabels
          :  oC_NodeLabel ( SP? oC_NodeLabel )* ;

oC_NodeLabel
         :  ':' SP? oC_LabelName ;

oC_RangeLiteral
            :  '*' SP? ( oC_IntegerLiteral SP? )? ( '..' SP? ( oC_IntegerLiteral SP? )? )? ;

oC_LabelName
         :  oC_SchemaName ;

oC_RelTypeName
           :  oC_SchemaName ;

oC_Expression
          :  oC_OrExpression ;

oC_OrExpression
            :  oC_XorExpression ( SP OR SP oC_XorExpression )* ;

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

oC_XorExpression
             :  oC_AndExpression ( SP XOR SP oC_AndExpression )* ;

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

oC_AndExpression
             :  oC_NotExpression ( SP AND SP oC_NotExpression )* ;

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

oC_NotExpression
             :  ( NOT SP? )* oC_ComparisonExpression ;

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

oC_ComparisonExpression
                    :  oC_AddOrSubtractExpression ( SP? oC_PartialComparisonExpression )* ;

oC_AddOrSubtractExpression
                       :  oC_MultiplyDivideModuloExpression ( ( SP? '+' SP? oC_MultiplyDivideModuloExpression ) | ( SP? '-' SP? oC_MultiplyDivideModuloExpression ) )* ;

oC_MultiplyDivideModuloExpression
                              :  oC_PowerOfExpression ( ( SP? '*' SP? oC_PowerOfExpression ) | ( SP? '/' SP? oC_PowerOfExpression ) | ( SP? '%' SP? oC_PowerOfExpression ) )* ;

oC_PowerOfExpression
                 :  oC_UnaryAddOrSubtractExpression ( SP? '^' SP? oC_UnaryAddOrSubtractExpression )* ;

oC_UnaryAddOrSubtractExpression
                            :  ( ( '+' | '-' ) SP? )* oC_StringListNullOperatorExpression ;

oC_StringListNullOperatorExpression
                                :  oC_PropertyOrLabelsExpression ( oC_StringOperatorExpression | oC_ListOperatorExpression | oC_NullOperatorExpression )* ;

oC_ListOperatorExpression
                      :  ( SP IN SP? oC_PropertyOrLabelsExpression )
                          | ( SP? '[' oC_Expression ']' )
                          | ( SP? '[' oC_Expression? '..' oC_Expression? ']' )
                          ;

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

oC_StringOperatorExpression
                        :  ( ( SP STARTS SP WITH ) | ( SP ENDS SP WITH ) | ( SP CONTAINS ) ) SP? oC_PropertyOrLabelsExpression ;

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' )  ;

oC_NullOperatorExpression
                      :  ( SP IS SP NULL )
                          | ( SP IS SP NOT SP NULL )
                          ;

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

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

oC_PropertyOrLabelsExpression
                          :  oC_Atom ( SP? oC_PropertyLookup )* ( SP? oC_NodeLabels )? ;

oC_Atom
    :  oC_Literal
        | oC_Parameter
        | oC_CaseExpression
        | ( COUNT SP? '(' SP? '*' SP? ')' )
        | oC_ListComprehension
        | oC_PatternComprehension
        | ( ALL SP? '(' SP? oC_FilterExpression SP? ')' )
        | ( ANY SP? '(' SP? oC_FilterExpression SP? ')' )
        | ( NONE SP? '(' SP? oC_FilterExpression SP? ')' )
        | ( SINGLE SP? '(' SP? oC_FilterExpression SP? ')' )
        | oC_RelationshipsPattern
        | oC_ParenthesizedExpression
        | oC_FunctionInvocation
        | oC_Variable
        ;

COUNT : ( 'C' | 'c' ) ( 'O' | 'o' ) ( 'U' | 'u' ) ( 'N' | 'n' ) ( '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' )  ;

oC_Literal
       :  oC_NumberLiteral
           | StringLiteral
           | oC_BooleanLiteral
           | NULL
           | oC_MapLiteral
           | oC_ListLiteral
           ;

oC_BooleanLiteral
              :  TRUE
                  | FALSE
                  ;

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

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

oC_ListLiteral
           :  '[' SP? ( oC_Expression SP? ( ',' SP? oC_Expression SP? )* )? ']' ;

oC_PartialComparisonExpression
                           :  ( '=' SP? oC_AddOrSubtractExpression )
                               | ( '<>' SP? oC_AddOrSubtractExpression )
                               | ( '<' SP? oC_AddOrSubtractExpression )
                               | ( '>' SP? oC_AddOrSubtractExpression )
                               | ( '<=' SP? oC_AddOrSubtractExpression )
                               | ( '>=' SP? oC_AddOrSubtractExpression )
                               ;

oC_ParenthesizedExpression
                       :  '(' SP? oC_Expression SP? ')' ;

oC_RelationshipsPattern
                    :  oC_NodePattern ( SP? oC_PatternElementChain )+ ;

oC_FilterExpression
                :  oC_IdInColl ( SP? oC_Where )? ;

oC_IdInColl
        :  oC_Variable SP IN SP oC_Expression ;

oC_FunctionInvocation
                  :  oC_FunctionName SP? '(' SP? ( DISTINCT SP? )? ( oC_Expression SP? ( ',' SP? oC_Expression SP? )* )? ')' ;

oC_FunctionName
            :  ( oC_Namespace oC_SymbolicName )
                | EXISTS
                ;

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

oC_ExplicitProcedureInvocation
                           :  oC_ProcedureName SP? '(' SP? ( oC_Expression SP? ( ',' SP? oC_Expression SP? )* )? ')' ;

oC_ImplicitProcedureInvocation
                           :  oC_ProcedureName ;

oC_ProcedureResultField
                    :  oC_SymbolicName ;

oC_ProcedureName
             :  oC_Namespace oC_SymbolicName ;

oC_Namespace
         :  ( oC_SymbolicName '.' )* ;

oC_ListComprehension
                 :  '[' SP? oC_FilterExpression ( SP? '|' SP? oC_Expression )? SP? ']' ;

oC_PatternComprehension
                    :  '[' SP? ( oC_Variable SP? '=' SP? )? oC_RelationshipsPattern SP? ( WHERE SP? oC_Expression SP? )? '|' SP? oC_Expression SP? ']' ;

oC_PropertyLookup
              :  '.' SP? ( oC_PropertyKeyName ) ;

oC_CaseExpression
              :  ( ( CASE ( SP? oC_CaseAlternatives )+ ) | ( CASE SP? oC_Expression ( SP? oC_CaseAlternatives )+ ) ) ( SP? ELSE SP? oC_Expression )? SP? END ;

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' )  ;

oC_CaseAlternatives
                :  WHEN SP? oC_Expression SP? THEN SP? oC_Expression ;

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

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

oC_Variable
        :  oC_SymbolicName ;

StringLiteral
             :  ( '"' ( StringLiteral_0 | EscapedChar )* '"' )
                 | ( '\'' ( StringLiteral_1 | EscapedChar )* '\'' )
                 ;

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 ) ) ) ;

oC_NumberLiteral
             :  oC_DoubleLiteral
                 | oC_IntegerLiteral
                 ;

oC_MapLiteral
          :  '{' SP? ( oC_PropertyKeyName SP? ':' SP? oC_Expression SP? ( ',' SP? oC_PropertyKeyName SP? ':' SP? oC_Expression SP? )* )? '}' ;

oC_Parameter
         :  '$' ( oC_SymbolicName | DecimalInteger ) ;

oC_PropertyExpression
                  :  oC_Atom ( SP? oC_PropertyLookup )+ ;

oC_PropertyKeyName
               :  oC_SchemaName ;

oC_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' ;

oC_DoubleLiteral
             :  ExponentDecimalReal
                 | RegularDecimalReal
                 ;

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

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

oC_SchemaName
          :  oC_SymbolicName
              | oC_ReservedWord
              ;

oC_ReservedWord
            :  ALL
                | ASC
                | ASCENDING
                | BY
                | CREATE
                | DELETE
                | DESC
                | DESCENDING
                | DETACH
                | EXISTS
                | LIMIT
                | MATCH
                | MERGE
                | ON
                | OPTIONAL
                | ORDER
                | REMOVE
                | RETURN
                | SET
                | L_SKIP
                | WHERE
                | WITH
                | UNION
                | UNWIND
                | AND
                | AS
                | CONTAINS
                | DISTINCT
                | ENDS
                | IN
                | IS
                | NOT
                | OR
                | STARTS
                | XOR
                | FALSE
                | TRUE
                | NULL
                | CONSTRAINT
                | DO
                | FOR
                | REQUIRE
                | UNIQUE
                | CASE
                | WHEN
                | THEN
                | ELSE
                | END
                | MANDATORY
                | SCALAR
                | OF
                | ADD
                | DROP
                ;

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

DO : ( 'D' | 'd' ) ( 'O' | 'o' )  ;

FOR : ( 'F' | 'f' ) ( 'O' | 'o' ) ( 'R' | 'r' )  ;

REQUIRE : ( 'R' | 'r' ) ( 'E' | 'e' ) ( 'Q' | 'q' ) ( 'U' | 'u' ) ( 'I' | 'i' ) ( 'R' | 'r' ) ( 'E' | 'e' )  ;

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

MANDATORY : ( 'M' | 'm' ) ( 'A' | 'a' ) ( 'N' | 'n' ) ( 'D' | 'd' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'O' | 'o' ) ( 'R' | 'r' ) ( 'Y' | 'y' )  ;

SCALAR : ( 'S' | 's' ) ( 'C' | 'c' ) ( 'A' | 'a' ) ( 'L' | 'l' ) ( 'A' | 'a' ) ( 'R' | 'r' )  ;

OF : ( 'O' | 'o' ) ( 'F' | 'f' )  ;

ADD : ( 'A' | 'a' ) ( 'D' | 'd' ) ( 'D' | 'd' )  ;

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

oC_SymbolicName
            :  UnescapedSymbolicName
                | EscapedSymbolicName
                | HexLetter
                | COUNT
                | FILTER
                | EXTRACT
                | ANY
                | NONE
                | SINGLE
                ;

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' )  ;

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
                   | Pc
                   ;

/**
 * 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
                   :  ( '`' ( EscapedSymbolicName_0 )* '`' )+ ;

SP
  :  ( WHITESPACE )+ ;

WHITESPACE
          :  SPACE
              | TAB
              | LF
              | VT
              | FF
              | CR
              | FS
              | GS
              | RS
              | US
              | '\u1680'
              | '\u180e'
              | '\u2000'
              | '\u2001'
              | '\u2002'
              | '\u2003'
              | '\u2004'
              | '\u2005'
              | '\u2006'
              | '\u2008'
              | '\u2009'
              | '\u200a'
              | '\u2028'
              | '\u2029'
              | '\u205f'
              | '\u3000'
              | '\u00a0'
              | '\u2007'
              | '\u202f'
              | Comment
              ;

Comment
       :  ( '/*' ( Comment_1 | ( '*' Comment_2 ) )* '*/' )
           | ( '//' ( Comment_3 )* CR? ( LF | EOF ) )
           ;

oC_LeftArrowHead
             :  '<'
                 | '\u27e8'
                 | '\u3008'
                 | '\ufe64'
                 | '\uff1c'
                 ;

oC_RightArrowHead
              :  '>'
                  | '\u27e9'
                  | '\u3009'
                  | '\ufe65'
                  | '\uff1e'
                  ;

oC_Dash
    :  '-'
        | '\u00ad'
        | '\u2010'
        | '\u2011'
        | '\u2012'
        | '\u2013'
        | '\u2014'
        | '\u2015'
        | '\u2212'
        | '\ufe58'
        | '\ufe63'
        | '\uff0d'
        ;

fragment FF : [\f] ;

fragment EscapedSymbolicName_0 : ~[`] ;

fragment RS : [\u001E] ;

fragment ID_Continue : [\p{ID_Continue}] ;

fragment Comment_1 : ~[*] ;

fragment StringLiteral_1 : ~['\\] ;

fragment Comment_3 : ~[\n\r] ;

fragment Comment_2 : ~[/] ;

fragment GS : [\u001D] ;

fragment FS : [\u001C] ;

fragment CR : [\r] ;

fragment Sc : [\p{Sc}] ;

fragment SPACE : [ ] ;

fragment Pc : [\p{Pc}] ;

fragment TAB : [\t] ;

fragment StringLiteral_0 : ~["\\] ;

fragment LF : [\n] ;

fragment VT : [\u000B] ;

fragment US : [\u001F] ;

fragment ID_Start : [\p{ID_Start}] ;
	/**
	* Copyright (c) 2015-2020 "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.
	*
	* Attribution Notice under the terms of the Apache License 2.0
	*
	* This work was created by the collective efforts of the openCypher community.
	* Without limiting the terms of Section 6, any Derivative Work that is not
	* approved by the public consensus process of the openCypher Implementers Group
	* should not be described as “Cypher” (and Cypher® is a registered trademark of
	* Neo4j Inc.) or as "openCypher". Extensions by implementers or prototypes or
	* proposals for change that have been documented or implemented should only be
	* described as "implementation extensions to Cypher" or as "proposed changes to
	* Cypher that are not yet approved by the openCypher community".
	*/
	grammar Cypher;

	oC_Cypher
	: SP? oC_Statement ( SP? ';' )? SP? EOF ;

	oC_Statement
	: oC_Query ;

	oC_Query
	: oC_RegularQuery
	\| oC_StandaloneCall
	;

	oC_RegularQuery
	: oC_SingleQuery ( SP? oC_Union )* ;

	oC_Union
	: ( UNION SP ALL SP? oC_SingleQuery )
	\| ( UNION SP? oC_SingleQuery )
	;

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

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

	oC_SingleQuery
	: oC_SinglePartQuery
	\| oC_MultiPartQuery
	;

	oC_SinglePartQuery
	: ( ( oC_ReadingClause SP? )* oC_Return )
	\| ( ( oC_ReadingClause SP? )* oC_UpdatingClause ( SP? oC_UpdatingClause )* ( SP? oC_Return )? )
	;

	oC_MultiPartQuery
	: ( ( oC_ReadingClause SP? )* ( oC_UpdatingClause SP? )* oC_With SP? )+ oC_SinglePartQuery ;

	oC_UpdatingClause
	: oC_Create
	\| oC_Merge
	\| oC_Delete
	\| oC_Set
	\| oC_Remove
	;

	oC_ReadingClause
	: oC_Match
	\| oC_Unwind
	\| oC_InQueryCall
	;

	oC_Match
	: ( OPTIONAL SP )? MATCH SP? oC_Pattern ( SP? oC_Where )? ;

	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' ) ;

	oC_Unwind
	: UNWIND SP? oC_Expression SP AS SP oC_Variable ;

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

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

	oC_Merge
	: MERGE SP? oC_PatternPart ( SP oC_MergeAction )* ;

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

	oC_MergeAction
	: ( ON SP MATCH SP oC_Set )
	\| ( ON SP CREATE SP oC_Set )
	;

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

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

	oC_Create
	: CREATE SP? oC_Pattern ;

	oC_Set
	: SET SP? oC_SetItem ( ',' oC_SetItem )* ;

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

	oC_SetItem
	: ( oC_PropertyExpression SP? '=' SP? oC_Expression )
	\| ( oC_Variable SP? '=' SP? oC_Expression )
	\| ( oC_Variable SP? '+=' SP? oC_Expression )
	\| ( oC_Variable SP? oC_NodeLabels )
	;

	oC_Delete
	: ( DETACH SP )? DELETE SP? oC_Expression ( SP? ',' SP? oC_Expression )* ;

	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' ) ;

	oC_Remove
	: REMOVE SP oC_RemoveItem ( SP? ',' SP? oC_RemoveItem )* ;

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

	oC_RemoveItem
	: ( oC_Variable oC_NodeLabels )
	\| oC_PropertyExpression
	;

	oC_InQueryCall
	: CALL SP oC_ExplicitProcedureInvocation ( SP? YIELD SP oC_YieldItems )? ;

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

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

	oC_StandaloneCall
	: CALL SP ( oC_ExplicitProcedureInvocation \| oC_ImplicitProcedureInvocation ) ( SP YIELD SP oC_YieldItems )? ;

	oC_YieldItems
	: ( '' \| ( oC_YieldItem ( SP? ',' SP? oC_YieldItem ) ) ) ( SP? oC_Where )? ;

	oC_YieldItem
	: ( oC_ProcedureResultField SP AS SP )? oC_Variable ;

	oC_With
	: WITH oC_ProjectionBody ( SP? oC_Where )? ;

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

	oC_Return
	: RETURN oC_ProjectionBody ;

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

	oC_ProjectionBody
	: ( SP? DISTINCT )? SP oC_ProjectionItems ( SP oC_Order )? ( SP oC_Skip )? ( SP oC_Limit )? ;

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

	oC_ProjectionItems
	: ( '' ( SP? ',' SP? oC_ProjectionItem ) )
	\| ( oC_ProjectionItem ( SP? ',' SP? oC_ProjectionItem )* )
	;

	oC_ProjectionItem
	: ( oC_Expression SP AS SP oC_Variable )
	\| oC_Expression
	;

	oC_Order
	: ORDER SP BY SP oC_SortItem ( ',' SP? oC_SortItem )* ;

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

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

	oC_Skip
	: L_SKIP SP oC_Expression ;

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

	oC_Limit
	: LIMIT SP oC_Expression ;

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

	oC_SortItem
	: oC_Expression ( SP? ( ASCENDING \| ASC \| DESCENDING \| DESC ) )? ;

	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' ) ;

	oC_Where
	: WHERE SP oC_Expression ;

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

	oC_Pattern
	: oC_PatternPart ( SP? ',' SP? oC_PatternPart )* ;

	oC_PatternPart
	: ( oC_Variable SP? '=' SP? oC_AnonymousPatternPart )
	\| oC_AnonymousPatternPart
	;

	oC_AnonymousPatternPart
	: oC_PatternElement ;

	oC_PatternElement
	: ( oC_NodePattern ( SP? oC_PatternElementChain )* )
	\| ( '(' oC_PatternElement ')' )
	;

	oC_NodePattern
	: '(' SP? ( oC_Variable SP? )? ( oC_NodeLabels SP? )? ( oC_Properties SP? )? ')' ;

	oC_PatternElementChain
	: oC_RelationshipPattern SP? oC_NodePattern ;

	oC_RelationshipPattern
	: ( oC_LeftArrowHead SP? oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash SP? oC_RightArrowHead )
	\| ( oC_LeftArrowHead SP? oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash )
	\| ( oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash SP? oC_RightArrowHead )
	\| ( oC_Dash SP? oC_RelationshipDetail? SP? oC_Dash )
	;

	oC_RelationshipDetail
	: '[' SP? ( oC_Variable SP? )? ( oC_RelationshipTypes SP? )? oC_RangeLiteral? ( oC_Properties SP? )? ']' ;

	oC_Properties
	: oC_MapLiteral
	\| oC_Parameter
	;

	oC_RelationshipTypes
	: ':' SP? oC_RelTypeName ( SP? '\|' ':'? SP? oC_RelTypeName )* ;

	oC_NodeLabels
	: oC_NodeLabel ( SP? oC_NodeLabel )* ;

	oC_NodeLabel
	: ':' SP? oC_LabelName ;

	oC_RangeLiteral
	: '*' SP? ( oC_IntegerLiteral SP? )? ( '..' SP? ( oC_IntegerLiteral SP? )? )? ;

	oC_LabelName
	: oC_SchemaName ;

	oC_RelTypeName
	: oC_SchemaName ;

	oC_Expression
	: oC_OrExpression ;

	oC_OrExpression
	: oC_XorExpression ( SP OR SP oC_XorExpression )* ;

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

	oC_XorExpression
	: oC_AndExpression ( SP XOR SP oC_AndExpression )* ;

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

	oC_AndExpression
	: oC_NotExpression ( SP AND SP oC_NotExpression )* ;

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

	oC_NotExpression
	: ( NOT SP? )* oC_ComparisonExpression ;

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

	oC_ComparisonExpression
	: oC_AddOrSubtractExpression ( SP? oC_PartialComparisonExpression )* ;

	oC_AddOrSubtractExpression
	: oC_MultiplyDivideModuloExpression ( ( SP? '+' SP? oC_MultiplyDivideModuloExpression ) \| ( SP? '-' SP? oC_MultiplyDivideModuloExpression ) )* ;

	oC_MultiplyDivideModuloExpression
	: oC_PowerOfExpression ( ( SP? '' SP? oC_PowerOfExpression ) \| ( SP? '/' SP? oC_PowerOfExpression ) \| ( SP? '%' SP? oC_PowerOfExpression ) ) ;

	oC_PowerOfExpression
	: oC_UnaryAddOrSubtractExpression ( SP? '^' SP? oC_UnaryAddOrSubtractExpression )* ;

	oC_UnaryAddOrSubtractExpression
	: ( ( '+' \| '-' ) SP? )* oC_StringListNullOperatorExpression ;

	oC_StringListNullOperatorExpression
	: oC_PropertyOrLabelsExpression ( oC_StringOperatorExpression \| oC_ListOperatorExpression \| oC_NullOperatorExpression )* ;

	oC_ListOperatorExpression
	: ( SP IN SP? oC_PropertyOrLabelsExpression )
	\| ( SP? '[' oC_Expression ']' )
	\| ( SP? '[' oC_Expression? '..' oC_Expression? ']' )
	;

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

	oC_StringOperatorExpression
	: ( ( SP STARTS SP WITH ) \| ( SP ENDS SP WITH ) \| ( SP CONTAINS ) ) SP? oC_PropertyOrLabelsExpression ;

	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' ) ;

	oC_NullOperatorExpression
	: ( SP IS SP NULL )
	\| ( SP IS SP NOT SP NULL )
	;

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

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

	oC_PropertyOrLabelsExpression
	: oC_Atom ( SP? oC_PropertyLookup )* ( SP? oC_NodeLabels )? ;

	oC_Atom
	: oC_Literal
	\| oC_Parameter
	\| oC_CaseExpression
	\| ( COUNT SP? '(' SP? '*' SP? ')' )
	\| oC_ListComprehension
	\| oC_PatternComprehension
	\| ( ALL SP? '(' SP? oC_FilterExpression SP? ')' )
	\| ( ANY SP? '(' SP? oC_FilterExpression SP? ')' )
	\| ( NONE SP? '(' SP? oC_FilterExpression SP? ')' )
	\| ( SINGLE SP? '(' SP? oC_FilterExpression SP? ')' )
	\| oC_RelationshipsPattern
	\| oC_ParenthesizedExpression
	\| oC_FunctionInvocation
	\| oC_Variable
	;

	COUNT : ( 'C' \| 'c' ) ( 'O' \| 'o' ) ( 'U' \| 'u' ) ( 'N' \| 'n' ) ( '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' ) ;

	oC_Literal
	: oC_NumberLiteral
	\| StringLiteral
	\| oC_BooleanLiteral
	\| NULL
	\| oC_MapLiteral
	\| oC_ListLiteral
	;

	oC_BooleanLiteral
	: TRUE
	\| FALSE
	;

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

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

	oC_ListLiteral
	: '[' SP? ( oC_Expression SP? ( ',' SP? oC_Expression SP? )* )? ']' ;

	oC_PartialComparisonExpression
	: ( '=' SP? oC_AddOrSubtractExpression )
	\| ( '<>' SP? oC_AddOrSubtractExpression )
	\| ( '<' SP? oC_AddOrSubtractExpression )
	\| ( '>' SP? oC_AddOrSubtractExpression )
	\| ( '<=' SP? oC_AddOrSubtractExpression )
	\| ( '>=' SP? oC_AddOrSubtractExpression )
	;

	oC_ParenthesizedExpression
	: '(' SP? oC_Expression SP? ')' ;

	oC_RelationshipsPattern
	: oC_NodePattern ( SP? oC_PatternElementChain )+ ;

	oC_FilterExpression
	: oC_IdInColl ( SP? oC_Where )? ;

	oC_IdInColl
	: oC_Variable SP IN SP oC_Expression ;

	oC_FunctionInvocation
	: oC_FunctionName SP? '(' SP? ( DISTINCT SP? )? ( oC_Expression SP? ( ',' SP? oC_Expression SP? )* )? ')' ;

	oC_FunctionName
	: ( oC_Namespace oC_SymbolicName )
	\| EXISTS
	;

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

	oC_ExplicitProcedureInvocation
	: oC_ProcedureName SP? '(' SP? ( oC_Expression SP? ( ',' SP? oC_Expression SP? )* )? ')' ;

	oC_ImplicitProcedureInvocation
	: oC_ProcedureName ;

	oC_ProcedureResultField
	: oC_SymbolicName ;

	oC_ProcedureName
	: oC_Namespace oC_SymbolicName ;

	oC_Namespace
	: ( oC_SymbolicName '.' )* ;

	oC_ListComprehension
	: '[' SP? oC_FilterExpression ( SP? '\|' SP? oC_Expression )? SP? ']' ;

	oC_PatternComprehension
	: '[' SP? ( oC_Variable SP? '=' SP? )? oC_RelationshipsPattern SP? ( WHERE SP? oC_Expression SP? )? '\|' SP? oC_Expression SP? ']' ;

	oC_PropertyLookup
	: '.' SP? ( oC_PropertyKeyName ) ;

	oC_CaseExpression
	: ( ( CASE ( SP? oC_CaseAlternatives )+ ) \| ( CASE SP? oC_Expression ( SP? oC_CaseAlternatives )+ ) ) ( SP? ELSE SP? oC_Expression )? SP? END ;

	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' ) ;

	oC_CaseAlternatives
	: WHEN SP? oC_Expression SP? THEN SP? oC_Expression ;

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

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

	oC_Variable
	: oC_SymbolicName ;

	StringLiteral
	: ( '"' ( StringLiteral_0 \| EscapedChar )* '"' )
	\| ( '\'' ( StringLiteral_1 \| EscapedChar )* '\'' )
	;

	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 ) ) ) ;

	oC_NumberLiteral
	: oC_DoubleLiteral
	\| oC_IntegerLiteral
	;

	oC_MapLiteral
	: '{' SP? ( oC_PropertyKeyName SP? ':' SP? oC_Expression SP? ( ',' SP? oC_PropertyKeyName SP? ':' SP? oC_Expression SP? )* )? '}' ;

	oC_Parameter
	: '$' ( oC_SymbolicName \| DecimalInteger ) ;

	oC_PropertyExpression
	: oC_Atom ( SP? oC_PropertyLookup )+ ;

	oC_PropertyKeyName
	: oC_SchemaName ;

	oC_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' ;

	oC_DoubleLiteral
	: ExponentDecimalReal
	\| RegularDecimalReal
	;

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

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

	oC_SchemaName
	: oC_SymbolicName
	\| oC_ReservedWord
	;

	oC_ReservedWord
	: ALL
	\| ASC
	\| ASCENDING
	\| BY
	\| CREATE
	\| DELETE
	\| DESC
	\| DESCENDING
	\| DETACH
	\| EXISTS
	\| LIMIT
	\| MATCH
	\| MERGE
	\| ON
	\| OPTIONAL
	\| ORDER
	\| REMOVE
	\| RETURN
	\| SET
	\| L_SKIP
	\| WHERE
	\| WITH
	\| UNION
	\| UNWIND
	\| AND
	\| AS
	\| CONTAINS
	\| DISTINCT
	\| ENDS
	\| IN
	\| IS
	\| NOT
	\| OR
	\| STARTS
	\| XOR
	\| FALSE
	\| TRUE
	\| NULL
	\| CONSTRAINT
	\| DO
	\| FOR
	\| REQUIRE
	\| UNIQUE
	\| CASE
	\| WHEN
	\| THEN
	\| ELSE
	\| END
	\| MANDATORY
	\| SCALAR
	\| OF
	\| ADD
	\| DROP
	;

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

	DO : ( 'D' \| 'd' ) ( 'O' \| 'o' ) ;

	FOR : ( 'F' \| 'f' ) ( 'O' \| 'o' ) ( 'R' \| 'r' ) ;

	REQUIRE : ( 'R' \| 'r' ) ( 'E' \| 'e' ) ( 'Q' \| 'q' ) ( 'U' \| 'u' ) ( 'I' \| 'i' ) ( 'R' \| 'r' ) ( 'E' \| 'e' ) ;

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

	MANDATORY : ( 'M' \| 'm' ) ( 'A' \| 'a' ) ( 'N' \| 'n' ) ( 'D' \| 'd' ) ( 'A' \| 'a' ) ( 'T' \| 't' ) ( 'O' \| 'o' ) ( 'R' \| 'r' ) ( 'Y' \| 'y' ) ;

	SCALAR : ( 'S' \| 's' ) ( 'C' \| 'c' ) ( 'A' \| 'a' ) ( 'L' \| 'l' ) ( 'A' \| 'a' ) ( 'R' \| 'r' ) ;

	OF : ( 'O' \| 'o' ) ( 'F' \| 'f' ) ;

	ADD : ( 'A' \| 'a' ) ( 'D' \| 'd' ) ( 'D' \| 'd' ) ;

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

	oC_SymbolicName
	: UnescapedSymbolicName
	\| EscapedSymbolicName
	\| HexLetter
	\| COUNT
	\| FILTER
	\| EXTRACT
	\| ANY
	\| NONE
	\| SINGLE
	;

	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' ) ;

	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
	\| Pc
	;

	/**
	* 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
	: ( '`' ( EscapedSymbolicName_0 )* '`' )+ ;

	SP
	: ( WHITESPACE )+ ;

	WHITESPACE
	: SPACE
	\| TAB
	\| LF
	\| VT
	\| FF
	\| CR
	\| FS
	\| GS
	\| RS
	\| US
	\| '\u1680'
	\| '\u180e'
	\| '\u2000'
	\| '\u2001'
	\| '\u2002'
	\| '\u2003'
	\| '\u2004'
	\| '\u2005'
	\| '\u2006'
	\| '\u2008'
	\| '\u2009'
	\| '\u200a'
	\| '\u2028'
	\| '\u2029'
	\| '\u205f'
	\| '\u3000'
	\| '\u00a0'
	\| '\u2007'
	\| '\u202f'
	\| Comment
	;

	Comment
	: ( '/' ( Comment_1 \| ( '' Comment_2 ) )* '*/' )
	\| ( '//' ( Comment_3 )* CR? ( LF \| EOF ) )
	;

	oC_LeftArrowHead
	: '<'
	\| '\u27e8'
	\| '\u3008'
	\| '\ufe64'
	\| '\uff1c'
	;

	oC_RightArrowHead
	: '>'
	\| '\u27e9'
	\| '\u3009'
	\| '\ufe65'
	\| '\uff1e'
	;

	oC_Dash
	: '-'
	\| '\u00ad'
	\| '\u2010'
	\| '\u2011'
	\| '\u2012'
	\| '\u2013'
	\| '\u2014'
	\| '\u2015'
	\| '\u2212'
	\| '\ufe58'
	\| '\ufe63'
	\| '\uff0d'
	;

	fragment FF : [\f] ;

	fragment EscapedSymbolicName_0 : ~[`] ;

	fragment RS : [\u001E] ;

	fragment ID_Continue : [\p{ID_Continue}] ;

	fragment Comment_1 : ~[*] ;

	fragment StringLiteral_1 : ~['\\] ;

	fragment Comment_3 : ~[\n\r] ;

	fragment Comment_2 : ~[/] ;

	fragment GS : [\u001D] ;

	fragment FS : [\u001C] ;

	fragment CR : [\r] ;

	fragment Sc : [\p{Sc}] ;

	fragment SPACE : [ ] ;

	fragment Pc : [\p{Pc}] ;

	fragment TAB : [\t] ;

	fragment StringLiteral_0 : ~["\\] ;

	fragment LF : [\n] ;

	fragment VT : [\u000B] ;

	fragment US : [\u001F] ;

	fragment ID_Start : [\p{ID_Start}] ;