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3774 lines (2986 loc) · 75.9 KB
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grammar GQL;
options { caseInsensitive = true; }
// 6 <GQL-program>
gqlProgram
: programActivity sessionCloseCommand? EOF
| sessionCloseCommand EOF
;
programActivity
: sessionActivity
| transactionActivity
;
sessionActivity
: sessionResetCommand+
| sessionSetCommand+ sessionResetCommand*
;
transactionActivity
: startTransactionCommand (procedureSpecification endTransactionCommand?)?
| procedureSpecification endTransactionCommand?
| endTransactionCommand
;
endTransactionCommand
: rollbackCommand
| commitCommand
;
// 7.1 <session set command>
sessionSetCommand
: SESSION SET (sessionSetSchemaClause | sessionSetGraphClause | sessionSetTimeZoneClause | sessionSetParameterClause)
;
sessionSetSchemaClause
: SCHEMA schemaReference
;
sessionSetGraphClause
: PROPERTY? GRAPH graphExpression
;
sessionSetTimeZoneClause
: TIME ZONE setTimeZoneValue
;
setTimeZoneValue
: timeZoneString
;
sessionSetParameterClause
: sessionSetGraphParameterClause
| sessionSetBindingTableParameterClause
| sessionSetValueParameterClause
;
sessionSetGraphParameterClause
: PROPERTY? GRAPH sessionSetParameterName optTypedGraphInitializer
;
sessionSetBindingTableParameterClause
: BINDING? TABLE sessionSetParameterName optTypedBindingTableInitializer
;
sessionSetValueParameterClause
: VALUE sessionSetParameterName optTypedValueInitializer
;
sessionSetParameterName
: (IF NOT EXISTS)? sessionParameterSpecification
;
// 7.2 <session reset command>
sessionResetCommand
: SESSION RESET sessionResetArguments?
;
sessionResetArguments
: ALL? (PARAMETERS | CHARACTERISTICS)
| SCHEMA
| PROPERTY? GRAPH
| TIME ZONE
| PARAMETER? sessionParameterSpecification
;
// 7.3 <session close command>
sessionCloseCommand
: SESSION CLOSE
;
// 7.4 <session parameter specification>
sessionParameterSpecification
: GENERAL_PARAMETER_REFERENCE
;
// 8.1 <start transaction command>
startTransactionCommand
: START TRANSACTION transactionCharacteristics?
;
// 8.2 <transaction characteristics>
transactionCharacteristics
: transactionMode (COMMA transactionMode)*
;
transactionMode
: transactionAccessMode
;
transactionAccessMode
: READ ONLY
| READ WRITE
;
// 8.3 <rollback command>
rollbackCommand
: ROLLBACK
;
// 8.4 <commit command>
commitCommand
: COMMIT
;
// 9.1 <nested procedure specification>
nestedProcedureSpecification
: LEFT_BRACE procedureSpecification RIGHT_BRACE
;
// <catalog-modifying procedure specification>, <data-modifying procedure specification> and <query specification> are
// identical productions. The specification distinguishes them in the BNF, but in the implementation, the distinction
// has to be made sematically, in code, based on the kind of statements contained in the <procedure specification>.
procedureSpecification
: procedureBody
// : catalogModifyingProcedureSpecification
// | dataModifyingProcedureSpecification
// | querySpecification
;
//catalogModifyingProcedureSpecification
// : procedureBody
// ;
nestedDataModifyingProcedureSpecification
: LEFT_BRACE procedureBody RIGHT_BRACE
;
//dataModifyingProcedureSpecification
// : procedureBody
// ;
nestedQuerySpecification
: LEFT_BRACE procedureBody RIGHT_BRACE
;
//querySpecification
// : procedureBody
// ;
// 9.2 <procedure body>
procedureBody
: atSchemaClause? bindingVariableDefinitionBlock? statementBlock
;
bindingVariableDefinitionBlock
: bindingVariableDefinition+
;
bindingVariableDefinition
: graphVariableDefinition
| bindingTableVariableDefinition
| valueVariableDefinition
;
statementBlock
: statement nextStatement*
;
statement
: compositeQueryStatement
| linearCatalogModifyingStatement
| linearDataModifyingStatement
;
nextStatement
: NEXT yieldClause? statement
;
// 10.1 <graph variable definition>
graphVariableDefinition
: PROPERTY? GRAPH bindingVariable optTypedGraphInitializer
;
optTypedGraphInitializer
: (typed? graphReferenceValueType)? graphInitializer
;
graphInitializer
: EQUALS_OPERATOR graphExpression
;
// 10.2 <binding table variable definition>
bindingTableVariableDefinition
: BINDING? TABLE bindingVariable optTypedBindingTableInitializer
;
optTypedBindingTableInitializer
: (typed? bindingTableReferenceValueType)? bindingTableInitializer
;
bindingTableInitializer
: EQUALS_OPERATOR bindingTableExpression
;
// 10.3 <value variable definition>
valueVariableDefinition
: VALUE bindingVariable optTypedValueInitializer
;
optTypedValueInitializer
: (typed? valueType)? valueInitializer
;
valueInitializer
: EQUALS_OPERATOR valueExpression
;
// 11.1 <graph expression>
graphExpression
: graphReference
| objectExpressionPrimary
| objectNameOrBindingVariable
| currentGraph
;
currentGraph
: CURRENT_PROPERTY_GRAPH
| CURRENT_GRAPH
;
// 11.2 <binding table expression>
bindingTableExpression
: nestedBindingTableQuerySpecification
| bindingTableReference
| objectExpressionPrimary
| objectNameOrBindingVariable
;
nestedBindingTableQuerySpecification
: nestedQuerySpecification
;
// 11.3 <object expression primary>
objectExpressionPrimary
: VARIABLE valueExpressionPrimary
| parenthesizedValueExpression
| nonParenthesizedValueExpressionPrimarySpecialCase
;
// 12.1 <linear catalog-modifying statement>
linearCatalogModifyingStatement
: simpleCatalogModifyingStatement+
;
simpleCatalogModifyingStatement
: primitiveCatalogModifyingStatement
| callCatalogModifyingProcedureStatement
;
primitiveCatalogModifyingStatement
: createSchemaStatement
| dropSchemaStatement
| createGraphStatement
| dropGraphStatement
| createGraphTypeStatement
| dropGraphTypeStatement
;
// 12.2 <insert schema statement>
createSchemaStatement
: CREATE SCHEMA (IF NOT EXISTS)? catalogSchemaParentAndName
;
// 12.3 <drop schema statement>
dropSchemaStatement
: DROP SCHEMA (IF EXISTS)? catalogSchemaParentAndName
;
// 12.4 <insert graph statement>
createGraphStatement
: CREATE (PROPERTY? GRAPH (IF NOT EXISTS)? | OR REPLACE PROPERTY? GRAPH) catalogGraphParentAndName (openGraphType | ofGraphType) graphSource?
;
openGraphType
: typed? ANY (PROPERTY? GRAPH)?
;
ofGraphType
: graphTypeLikeGraph
| typed? graphTypeReference
| typed? (PROPERTY? GRAPH)? nestedGraphTypeSpecification
;
graphTypeLikeGraph
: LIKE graphExpression
;
graphSource
: AS COPY OF graphExpression
;
// 12.5 <drop graph statement>
dropGraphStatement
: DROP PROPERTY? GRAPH (IF EXISTS)? catalogGraphParentAndName
;
// 12.6 <graph type statement>
createGraphTypeStatement
: CREATE (PROPERTY? GRAPH TYPE (IF NOT EXISTS)? | OR REPLACE PROPERTY? GRAPH TYPE) catalogGraphTypeParentAndName graphTypeSource
;
graphTypeSource
: AS? copyOfGraphType
| graphTypeLikeGraph
| AS? nestedGraphTypeSpecification
;
copyOfGraphType
: COPY OF graphTypeReference
;
// 12.7 <drop graph statement>
dropGraphTypeStatement
: DROP PROPERTY? GRAPH TYPE (IF EXISTS)? catalogGraphTypeParentAndName
;
// 12.8 <call catalog-modifying statement>
callCatalogModifyingProcedureStatement
: callProcedureStatement
;
// 13.1 <linear data-modifying statement>
linearDataModifyingStatement
: focusedLinearDataModifyingStatement
| ambientLinearDataModifyingStatement
;
focusedLinearDataModifyingStatement
: focusedLinearDataModifyingStatementBody
| focusedNestedDataModifyingProcedureSpecification
;
focusedLinearDataModifyingStatementBody
: useGraphClause simpleLinearDataAccessingStatement primitiveResultStatement?
;
focusedNestedDataModifyingProcedureSpecification
: useGraphClause nestedDataModifyingProcedureSpecification
;
ambientLinearDataModifyingStatement
: ambientLinearDataModifyingStatementBody
| nestedDataModifyingProcedureSpecification
;
ambientLinearDataModifyingStatementBody
: simpleLinearDataAccessingStatement primitiveResultStatement?
;
simpleLinearDataAccessingStatement
: simpleDataAccessingStatement+
;
simpleDataAccessingStatement
: simpleQueryStatement
| simpleDataModifyingStatement
;
simpleDataModifyingStatement
: primitiveDataModifyingStatement
| callDataModifyingProcedureStatement
;
primitiveDataModifyingStatement
: insertStatement
| setStatement
| removeStatement
| deleteStatement
;
// 13.2 <insertStatement>
insertStatement
: INSERT insertGraphPattern
;
// 13.3 <set statement>
setStatement
: SET setItemList
;
setItemList
: setItem (COMMA setItem)*
;
setItem
: setPropertyItem
| setAllPropertiesItem
| setLabelItem
;
setPropertyItem
: bindingVariableReference PERIOD propertyName EQUALS_OPERATOR valueExpression
;
setAllPropertiesItem
: bindingVariableReference EQUALS_OPERATOR LEFT_BRACE propertyKeyValuePairList? RIGHT_BRACE
;
setLabelItem
: bindingVariableReference isOrColon labelName
;
// 13.4 <remove statement>
removeStatement
: REMOVE removeItemList
;
removeItemList
: removeItem (COMMA removeItem)*
;
removeItem
: removePropertyItem
| removeLabelItem
;
removePropertyItem
: bindingVariableReference PERIOD propertyName
;
removeLabelItem
: bindingVariableReference isOrColon labelName
;
// 13.5 <delete statement>
deleteStatement
: (DETACH | NODETACH)? DELETE deleteItemList
;
deleteItemList
: deleteItem (COMMA deleteItem)*
;
deleteItem
: valueExpression
;
// 13.6 <call data-modifying procedure statement>
callDataModifyingProcedureStatement
: callProcedureStatement
;
// 14.1 <composite query statement>
compositeQueryStatement
: compositeQueryExpression
;
// 14.2 <composite query expression>
compositeQueryExpression
: compositeQueryExpression queryConjunction compositeQueryPrimary
| compositeQueryPrimary
;
queryConjunction
: setOperator
| OTHERWISE
;
setOperator
: UNION setQuantifier?
| EXCEPT setQuantifier?
| INTERSECT setQuantifier?
;
compositeQueryPrimary
: linearQueryStatement
;
// 14.3 <linear query statement> and <simple query statement>
linearQueryStatement
: focusedLinearQueryStatement
| ambientLinearQueryStatement
;
focusedLinearQueryStatement
: focusedLinearQueryStatementPart* focusedLinearQueryAndPrimitiveResultStatementPart
| focusedPrimitiveResultStatement
| focusedNestedQuerySpecification
| selectStatement
;
focusedLinearQueryStatementPart
: useGraphClause simpleLinearQueryStatement
;
focusedLinearQueryAndPrimitiveResultStatementPart
: useGraphClause simpleLinearQueryStatement primitiveResultStatement
;
focusedPrimitiveResultStatement
: useGraphClause primitiveResultStatement
;
focusedNestedQuerySpecification
: useGraphClause nestedQuerySpecification
;
ambientLinearQueryStatement
: simpleLinearQueryStatement? primitiveResultStatement
| nestedQuerySpecification
;
simpleLinearQueryStatement
: simpleQueryStatement+
;
simpleQueryStatement
: primitiveQueryStatement
| callQueryStatement
;
primitiveQueryStatement
: matchStatement
| letStatement
| forStatement
| filterStatement
| orderByAndPageStatement
;
// 14.4 <match statement>
matchStatement
: simpleMatchStatement
| optionalMatchStatement
;
simpleMatchStatement
: MATCH graphPatternBindingTable
;
optionalMatchStatement
: OPTIONAL optionalOperand
;
optionalOperand
: simpleMatchStatement
| LEFT_BRACE matchStatementBlock RIGHT_BRACE
| LEFT_PAREN matchStatementBlock RIGHT_PAREN
;
matchStatementBlock
: matchStatement+
;
// 14.5 <call query statement>
callQueryStatement
: callProcedureStatement
;
// 14.6 <filter statement>
filterStatement
: FILTER (whereClause | searchCondition)
;
// 14.7 <let statement>
letStatement
: LET letVariableDefinitionList
;
letVariableDefinitionList
: letVariableDefinition (COMMA letVariableDefinition)*
;
letVariableDefinition
: valueVariableDefinition
| bindingVariable EQUALS_OPERATOR valueExpression
;
// 14.8 <for statement>
forStatement
: FOR forItem forOrdinalityOrOffset?
;
forItem
: forItemAlias forItemSource
;
forItemAlias
: bindingVariable IN
;
forItemSource
: valueExpression
;
forOrdinalityOrOffset
: WITH (ORDINALITY | OFFSET) bindingVariable
;
// 14.9 <order by and page statement>
orderByAndPageStatement
: orderByClause offsetClause? limitClause?
| offsetClause limitClause?
| limitClause
;
// 14.10 <primitive result statement>
primitiveResultStatement
: returnStatement orderByAndPageStatement?
| FINISH
;
// 14.11 <return statement>
returnStatement
: RETURN returnStatementBody
;
returnStatementBody
: setQuantifier? (ASTERISK | returnItemList) groupByClause?
;
returnItemList
: returnItem (COMMA returnItem)*
;
returnItem
: aggregatingValueExpression returnItemAlias?
;
returnItemAlias
: AS identifier
;
// 14.12 <select statement>
selectStatement
: SELECT setQuantifier? (ASTERISK | selectItemList) (selectStatementBody whereClause? groupByClause? havingClause? orderByClause? offsetClause? limitClause?)?
;
selectItemList
: selectItem (COMMA selectItem)*
;
selectItem
: aggregatingValueExpression selectItemAlias?
;
selectItemAlias
: AS identifier
;
havingClause
: HAVING searchCondition
;
selectStatementBody
: FROM (selectGraphMatchList | selectQuerySpecification)
;
selectGraphMatchList
: selectGraphMatch (COMMA selectGraphMatch)*
;
selectGraphMatch
: graphExpression matchStatement
;
selectQuerySpecification
: nestedQuerySpecification
| graphExpression nestedQuerySpecification
;
// 15.1 <call procedure statement> and <procedure call>
callProcedureStatement
: OPTIONAL? CALL procedureCall
;
procedureCall
: inlineProcedureCall
| namedProcedureCall
;
// 15.2 <inline procedure call>
inlineProcedureCall
: variableScopeClause? nestedProcedureSpecification
;
variableScopeClause
: LEFT_PAREN bindingVariableReferenceList? RIGHT_PAREN
;
bindingVariableReferenceList
: bindingVariableReference (COMMA bindingVariableReference)*
;
// 15.3 <named procedure call>
namedProcedureCall
: procedureReference LEFT_PAREN procedureArgumentList? RIGHT_PAREN yieldClause?
;
procedureArgumentList
: procedureArgument (COMMA procedureArgument)*
;
procedureArgument
: valueExpression
;
// 16.1 <at schema clasue>
atSchemaClause
: AT schemaReference
;
// 16.2 <use graph clause>
useGraphClause
: USE graphExpression
;
// 16.3 <graph pattern binding table>
graphPatternBindingTable
: graphPattern graphPatternYieldClause?
;
graphPatternYieldClause
: YIELD graphPatternYieldItemList
;
graphPatternYieldItemList
: graphPatternYieldItem (COMMA graphPatternYieldItem)*
;
// <elemement variable reference> and <path variable reference> are identical productions, both consisting
// of a single non-terminal <binding variable reference>. Thus <graph pattern yield item> is ambiguous
// from a parsing standpoint. So here we simply use bindingVariableReference. Post parsing code must
// apply the semantics assocaited with each type of <binding variable reference>.
graphPatternYieldItem
: bindingVariableReference
// : elementVariableReference
// | pathVariableReference
;
// 16.4 <graph pattern>
graphPattern
: matchMode? pathPatternList keepClause? graphPatternWhereClause?
;
matchMode
: repeatableElementsMatchMode
| differentEdgesMatchMode
;
repeatableElementsMatchMode
: REPEATABLE elementBindingsOrElements
;
differentEdgesMatchMode
: DIFFERENT edgeBindingsOrEdges
;
elementBindingsOrElements
: ELEMENT BINDINGS?
| ELEMENTS
;
edgeBindingsOrEdges
: edgeSynonym BINDINGS?
| edgesSynonym
;
pathPatternList
: pathPattern (COMMA pathPattern)*
;
pathPattern
: pathVariableDeclaration? pathPatternPrefix? pathPatternExpression
;
pathVariableDeclaration
: pathVariable EQUALS_OPERATOR
;
keepClause
: KEEP pathPatternPrefix
;
graphPatternWhereClause
: WHERE searchCondition
;
// 16.5 <insert graph pattern>
insertGraphPattern
: insertPathPatternList
;
insertPathPatternList
: insertPathPattern (COMMA insertPathPattern)*
;
insertPathPattern
: insertNodePattern (insertEdgePattern insertNodePattern)*
;
insertNodePattern
: LEFT_PAREN insertElementPatternFiller? RIGHT_PAREN
;
insertEdgePattern
: insertEdgePointingLeft
| insertEdgePointingRight
| insertEdgeUndirected
;
insertEdgePointingLeft
: LEFT_ARROW_BRACKET insertElementPatternFiller? RIGHT_BRACKET_MINUS
;
insertEdgePointingRight
: MINUS_LEFT_BRACKET insertElementPatternFiller? BRACKET_RIGHT_ARROW
;
insertEdgeUndirected
: TILDE_LEFT_BRACKET insertElementPatternFiller? RIGHT_BRACKET_TILDE
;
insertElementPatternFiller
: elementVariableDeclaration labelAndPropertySetSpecification?
| elementVariableDeclaration? labelAndPropertySetSpecification
;
labelAndPropertySetSpecification
: isOrColon labelSetSpecification elementPropertySpecification?
| (isOrColon labelSetSpecification)? elementPropertySpecification
;
// 16.6 <path pattern prefix>
pathPatternPrefix
: pathModePrefix
| pathSearchPrefix
;
pathModePrefix
: pathMode pathOrPaths?
;
pathMode
: WALK
| TRAIL
| SIMPLE
| ACYCLIC
;
pathSearchPrefix
: allPathSearch
| anyPathSearch
| shortestPathSearch
;
allPathSearch
: ALL pathMode? pathOrPaths?
;
pathOrPaths
: PATH
| PATHS
;
anyPathSearch
: ANY numberOfPaths? pathMode? pathOrPaths?
;
numberOfPaths
: nonNegativeIntegerSpecification
;
shortestPathSearch
: allShortestPathSearch
| anyShortestPathSearch
| countedShortestPathSearch
| countedShortestGroupSearch
;
allShortestPathSearch
: ALL SHORTEST pathMode? pathOrPaths?
;
anyShortestPathSearch
: ANY SHORTEST pathMode? pathOrPaths?
;
countedShortestPathSearch
: SHORTEST numberOfPaths pathMode? pathOrPaths?
;
countedShortestGroupSearch
: SHORTEST numberOfGroups? pathMode? pathOrPaths? (GROUP | GROUPS)
;
numberOfGroups
: nonNegativeIntegerSpecification
;
// 16.7 <path pattern expression>
pathPatternExpression
: pathTerm #ppePathTerm
| pathTerm (MULTISET_ALTERNATION_OPERATOR pathTerm)+ #ppeMultisetAlternation
| pathTerm (VERTICAL_BAR pathTerm)+ #ppePatternUnion
;
pathTerm
: pathFactor+
;
pathFactor
: pathPrimary #pfPathPrimary
| pathPrimary graphPatternQuantifier #pfQuantifiedPathPrimary
| pathPrimary QUESTION_MARK #pfQuestionedPathPrimary
;
pathPrimary
: elementPattern #ppElementPattern
| parenthesizedPathPatternExpression #ppParenthesizedPathPatternExpression
| simplifiedPathPatternExpression #ppSimplifiedPathPatternExpression
;
elementPattern
: nodePattern
| edgePattern
;
nodePattern
: LEFT_PAREN elementPatternFiller RIGHT_PAREN
;
elementPatternFiller
: elementVariableDeclaration? isLabelExpression? elementPatternPredicate?
;