Query Hints

.gitignore

@@ -40,6 +40,8 @@ venv/
 
 # project specific
 /sparql-grammer/generated/
-SparqlParser.g4
-SparqlLexer.g4
 Sparql.g4
+
+# ANTLR tool
+gen/
+SparqlLexer.tokens

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.21)
 
-project(sparql-parser-base VERSION 0.3.4)
+project(sparql-parser-base VERSION 0.3.5)
 
 include(cmake/boilerplate_init.cmake)
 boilerplate_init()
@@ -19,10 +19,6 @@ endif ()
 
 find_package(antlr4-runtime REQUIRED)
 
-set(SPARQL_VERSION "1.1" CACHE STRING "SPARQL version" FORCE)
-mark_as_advanced(SPARQL_VERSION)
-
-
 set(ANTLR4_TAG "4.13.1" CACHE STRING "Antlr4 version" FORCE)
 mark_as_advanced(ANTLR4_TAG)
 set(ANTLR4_JAR_LOCATION "${PROJECT_BINARY_DIR}/antlr-${ANTLR4_TAG}-complete.jar")
@@ -36,81 +32,49 @@ include(${CMAKE_CURRENT_BINARY_DIR}/antlr4cmake/antlr4-generator.cmake)
 
 message("antlr4-runtime_DIR ${antlr4-runtime_DIR}")
 
-
-if (${SPARQL_VERSION} STREQUAL "1.1")
-    file(CREATE_LINK ${CMAKE_CURRENT_SOURCE_DIR}/SparqlLexer_${SPARQL_VERSION}.g4
-            ${CMAKE_CURRENT_BINARY_DIR}/SparqlLexer.g4)
-    file(CREATE_LINK ${CMAKE_CURRENT_SOURCE_DIR}/SparqlParser_${SPARQL_VERSION}.g4
-            ${CMAKE_CURRENT_BINARY_DIR}/SparqlParser.g4)
-else ()
-    file(CREATE_LINK ${CMAKE_CURRENT_SOURCE_DIR}/SparqlParser_${SPARQL_VERSION}.g4
-            ${CMAKE_CURRENT_BINARY_DIR}/Sparql.g4
-            )
-endif ()
-
-
-if (${SPARQL_VERSION} STREQUAL "1.1")
-    message("Generating SPARQL 1.1 Parser. If you want to generate the legacy SPARQL 1.0 parser, use -SPARQL_VERSION=1.0 or the conan package option sparql-parser-base:sparql_version=1.0 .")
-    antlr4_generate(
-            SparqlLexer
-            "${CMAKE_CURRENT_BINARY_DIR}/SparqlLexer.g4"
-            LEXER
-            FALSE # don't generate listener for lexer (not possible)
-            FALSE # don't generate visitor  for lexer (not possible)
-            "dice::sparql_parser::base"
-    )
-    file(CREATE_LINK ${ANTLR4_GENERATED_SRC_DIR}/SparqlLexer/SparqlLexer.tokens
-            ${CMAKE_CURRENT_BINARY_DIR}/SparqlLexer.tokens)
-    file(CREATE_LINK ${ANTLR4_GENERATED_SRC_DIR}/SparqlLexer/SparqlLexer.interp
-            ${CMAKE_CURRENT_BINARY_DIR}/SparqlLexer.interp)
-    antlr4_generate(
-            SparqlParser
-            "${CMAKE_CURRENT_BINARY_DIR}/SparqlParser.g4"
-            PARSER
-            TRUE # generate listener
-            TRUE # generate visitor
-            "dice::sparql_parser::base"
-    )
-else () # SPARQL 1.1
-    message("Generating SPARQL 1.0 Parser. This is a legacy version and will not receive any more updates.")
-    antlr4_generate(
-            Sparql
-            "${CMAKE_CURRENT_BINARY_DIR}/Sparql.g4"
-            BOTH
-            TRUE # generate listener
-            TRUE # generate visitor
-            "dice::sparql_parser::base"
-    )
-endif ()
-
-if (${SPARQL_VERSION} STREQUAL "1.1")
-    add_library("${PROJECT_NAME}"
-            ${ANTLR4_SRC_FILES_SparqlLexer}
-            ${ANTLR4_SRC_FILES_SparqlParser})
-    target_include_directories(sparql-parser-base PUBLIC
-            "$<BUILD_INTERFACE:${ANTLR4_INCLUDE_DIR_SparqlLexer}>"
-            "$<BUILD_INTERFACE:${ANTLR4_INCLUDE_DIR_SparqlParser}>")
-
-else ()
-    add_library("${PROJECT_NAME}"
-            ${ANTLR4_SRC_FILES_Sparql})
-    target_include_directories(sparql-parser-base PUBLIC
-            "$<BUILD_INTERFACE:${ANTLR4_INCLUDE_DIR_Sparql}>")
-endif ()
+message("Generating SPARQL 1.1 Parser")
+antlr4_generate(
+        SparqlLexer
+        "${CMAKE_CURRENT_SOURCE_DIR}/SparqlLexer.g4"
+        LEXER
+        FALSE # don't generate listener for lexer (not possible)
+        FALSE # don't generate visitor  for lexer (not possible)
+        "dice::sparql_parser::base"
+)
+file(CREATE_LINK ${ANTLR4_GENERATED_SRC_DIR}/SparqlLexer/SparqlLexer.tokens
+        ${CMAKE_CURRENT_BINARY_DIR}/SparqlLexer.tokens)
+file(CREATE_LINK ${ANTLR4_GENERATED_SRC_DIR}/SparqlLexer/SparqlLexer.interp
+        ${CMAKE_CURRENT_BINARY_DIR}/SparqlLexer.interp)
+antlr4_generate(
+        SparqlParser
+        "${CMAKE_CURRENT_SOURCE_DIR}/SparqlParser.g4"
+        PARSER
+        TRUE # generate listener
+        TRUE # generate visitor
+        "dice::sparql_parser::base"
+)
+
+add_library("${PROJECT_NAME}"
+        ${ANTLR4_SRC_FILES_SparqlLexer}
+        ${ANTLR4_SRC_FILES_SparqlParser})
+target_include_directories(sparql-parser-base PUBLIC
+        "$<BUILD_INTERFACE:${ANTLR4_INCLUDE_DIR_SparqlLexer}>"
+        "$<BUILD_INTERFACE:${ANTLR4_INCLUDE_DIR_SparqlParser}>")
 
 add_library("${PROJECT_NAME}::${PROJECT_NAME}" ALIAS "${PROJECT_NAME}")
 
 target_link_libraries(sparql-parser-base PUBLIC
         $<IF:$<BOOL:${BUILD_SHARED_LIBS}>,antlr4_shared,antlr4_static>
-        )
+)
 
 
 set_target_properties(${PROJECT_NAME} PROPERTIES
         VERSION ${PROJECT_VERSION}
         SOVERSION ${PROJECT_VERSION_MAJOR}
         CXX_STANDARD 17
         CXX_EXTENSIONS OFF
-        CXX_STANDARD_REQUIRED ON)
+        CXX_STANDARD_REQUIRED ON
+)
 
 if (PROJECT_IS_TOP_LEVEL)
     include(cmake/install_library.cmake)

README.md

@@ -1,7 +1,6 @@
 # SPARQL-parser-base
 
-[ANTLR-v4-based](https://github.com/antlr/antlr4)-based C++17 parser
-for [SPARQL 1.0](https://www.w3.org/TR/rdf-sparql-query/) and [SPARQL 1.1](https://www.w3.org/TR/sparql11-overview/)
+[ANTLR-v4-based](https://github.com/antlr/antlr4)-based C++17 parser for [SPARQL 1.1](https://www.w3.org/TR/sparql11-overview/)
 with visitors and listeners. During CMake configuration, the ANTLR v4 code generator is called. 
 
 ## Requirements
@@ -27,12 +26,9 @@ To use sparql-parser-base, add it to your `conanfile.txt`:
 
 ```
 [requires]
-sparql-parser-base/0.3.4
+sparql-parser-base/0.3.5
 ```
 
-If you want to use SPARQL 1.0 instead, add `sparql-parser-base:sparql_version=1.0` to the `[options]` section of your
-conan file.
-
 ### With FetchContent
 
 Use 
@@ -42,7 +38,7 @@ include(FetchContent)
 FetchContent_Declare(
         sparql-parser-base
         GIT_REPOSITORY "${CMAKE_CURRENT_SOURCE_DIR}/../"
-        GIT_TAG 0.3.4
+        GIT_TAG 0.3.5
         GIT_SHALLOW TRUE
 )
 FetchContent_MakeAvailable(sparql-parser-base)
@@ -70,7 +66,7 @@ make -j sparql-parser-base
 
 `-DBUILD_EXAMPLES=ON/OFF [default: OFF]`: Build the examples.
 
-`-DSPARQL_VERSION="1.0"/"1.1" [default: "1.1"]`: SPARQL version of the generated parser.
+
 
 `-DANTLR4_TAG=... [default: "4.13.1"]`: ANTLR4 version to be used.
 

SparqlLexer_1.1.g4 → SparqlLexer.g4

@@ -26,6 +26,17 @@ lexer grammar SparqlLexer;
 
 WS : (' '| '\t'| EOL)+ -> channel(99);
 
+Q_HINT_VAR_ORD: ('Q'|'q')'_'('H'|'h')('I'|'i')('N'|'n')('T'|'t')'_'('V'|'v')('A'|'a')('R'|'r')'_'('O'|'o')('R'|'r')('D'|'d');
+
+Q_HINT_CARD_EST: ('Q'|'q')'_'('H'|'h')('I'|'i')('N'|'n')('T'|'t')'_'('C'|'c')('A'|'a')('R'|'r')('D'|'d')'_'('E'|'e')('S'|'s')('T'|'t');
+
+CARD_EST_REDUCTION_FACTOR: ('C'|'c')('A'|'a')('R'|'r')('D'|'d')'_'('E'|'e')('S'|'s')('T'|'t')'_'
+                           ('R'|'r')('E'|'e')('D'|'d')('U'|'u')('C'|'c')('T'|'t')('I'|'i')('O'|'o')('N'|'n')'_'
+                           ('F'|'f')('A'|'a')('C'|'c')('T'|'t')('O'|'o')('R'|'r');
+
+CARD_EST_MIN_CARDINALITY: ('C'|'c')('A'|'a')('R'|'r')('D'|'d')'_'('E'|'e')('S'|'s')('T'|'t')'_'('M'|'m')('I'|'i')('N'|'n')'_'
+                          ('C'|'c')('A'|'a')('R'|'r')('D'|'d')('I'|'i')('N'|'n')('A'|'a')('L'|'l')('I'|'i')('T'|'t')('Y'|'y');
+
 BASE : ('B'|'b')('A'|'a')('S'|'s')('E'|'e');
 
 PREFIX : ('P'|'p')('R'|'r')('E'|'e')('F'|'f')('I'|'i')('X'|'x');

SparqlParser_1.1.g4 → SparqlParser.g4

@@ -55,7 +55,7 @@ subSelect
     ;
 
 selectClause
-    : SELECT selectModifier? (selectVariables+ | '*')
+    : hintsClause SELECT selectModifier? (selectVariables+ | '*')
     ;
 
 selectModifier
@@ -68,15 +68,36 @@ selectVariables
     ;
 
 constructQuery
-    : CONSTRUCT (constructTemplate datasetClause* whereClause solutionModifier | datasetClause* WHERE '{' triplesTemplate? '}' solutionModifier)
+    : hintsClause CONSTRUCT (constructTemplate datasetClause* whereClause solutionModifier | datasetClause* WHERE '{' triplesTemplate? '}' solutionModifier)
     ;
 
 describeQuery
     : DESCRIBE (varOrIRI+ | '*') datasetClause* whereClause? solutionModifier
     ;
 
 askQuery
-    : ASK datasetClause* whereClause solutionModifier
+    : hintsClause ASK datasetClause* whereClause solutionModifier
+    ;
+
+// NOT PART OF THE OFFICIAL GRAMMAR (tentris specific)
+// NOTE: The order matters (if there is a variableOrdering hint, it must be provided before the cardinalityEstimation hint)
+hintsClause
+    : variableOrdering? cardinalityEstimation?
+    ;
+
+// NOT PART OF THE OFFICIAL GRAMMAR (tentris specific)
+variableOrdering
+    : Q_HINT_VAR_ORD varOrBlankNode+
+    ;
+
+// NOT PART OF THE OFFICIAL GRAMMAR (tentris specific)
+cardinalityEstimation
+    : Q_HINT_CARD_EST (CARD_EST_REDUCTION_FACTOR|CARD_EST_MIN_CARDINALITY)
+    ;
+
+
+varOrBlankNode
+    : var | blankNode
     ;
 
 datasetClause