/*
 * Copyright (c) 2015-2019 "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 ( SP? DISTINCT )? SP oC_ReturnBody ( SP? oC_Where )? ;

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

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

oC_Return : RETURN ( SP? DISTINCT )? SP oC_ReturnBody ;

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

oC_ReturnBody : oC_ReturnItems ( SP oC_Order )? ( SP oC_Skip )? ( SP oC_Limit )? ;

oC_ReturnItems : ( '*' ( SP? ',' SP? oC_ReturnItem )* )
               | ( oC_ReturnItem ( SP? ',' SP? oC_ReturnItem )* )
               ;

oC_ReturnItem : ( 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' ) | ( '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
              | ' '
              | '᠎'
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | ' '
              | '　'
              | ' '
              | ' '
              | ' '
              | Comment
              ;

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

oC_LeftArrowHead : '<'
                 | '⟨'
                 | '〈'
                 | '﹤'
                 | '＜'
                 ;

oC_RightArrowHead : '>'
                  | '⟩'
                  | '〉'
                  | '﹥'
                  | '＞'
                  ;

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

fragment FF : [\f] ;

fragment EscapedSymbolicName_0 : [\u0000-_a-\uFFFF] ;

fragment RS : [\u001E] ;

fragment ID_Continue : 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;

fragment Comment_1 : [\u0000-)+-\uFFFF] ;

fragment StringLiteral_1 : [\u0000-&(-[\]-\uFFFF] ;

fragment Comment_3 : [\u0000-\t\u000B-\f\u000E-\uFFFF] ;

fragment Comment_2 : [\u0000-.0-\uFFFF] ;

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 Pc : [_\u203F-\u2040\u2054\uFE33-\uFE34\uFE4D-\uFE4F\uFF3F] ;

fragment TAB : [\t] ;

fragment StringLiteral_0 : [\u0000-!#-[\]-\uFFFF] ;

fragment LF : [\n] ;

fragment VT : [\u000B] ;

fragment US : [\u001F] ;

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