Package org.drools.drl.parser.lang

Class DRL5Parser

java.lang.Object
org.drools.drl.parser.lang.AbstractDRLParser
org.drools.drl.parser.lang.DRL5Parser
All Implemented Interfaces:
DRLParser
public class DRL5Parser extends AbstractDRLParser implements DRLParser

  • Constructor Details

    • DRL5Parser

      public DRL5Parser(org.antlr.runtime.TokenStream input)

  • Method Details

    • getLanguageLevel

      protected LanguageLevelOption getLanguageLevel()
      Specified by:
      getLanguageLevel in class AbstractDRLParser

    • compilationUnit

      protected final PackageDescr compilationUnit(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      Specified by:
      compilationUnit in class AbstractDRLParser
      Throws:
      org.antlr.runtime.RecognitionException

    • packageStatement

      public String packageStatement(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      Parses a package statement and returns the name of the package or null if none is defined. packageStatement := PACKAGE qualifiedIdentifier SEMICOLON?
      Returns:
      the name of the package or null if none is defined
      Throws:
      org.antlr.runtime.RecognitionException

    • statement

      public BaseDescr statement(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      statement := importStatement | globalStatement | declare | rule | ruleAttribute | function | query ;
      Throws:
      org.antlr.runtime.RecognitionException

    • importStatement

      public ImportDescr importStatement(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      importStatement := IMPORT (FUNCTION|STATIC)? qualifiedIdentifier (DOT STAR)?
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • globalStatement

      public GlobalDescr globalStatement(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      globalStatement := GLOBAL type ID
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • declare

      public BaseDescr declare(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      declare := DECLARE | (ENTRY-POINT) => entryPointDeclaration | (WINDOW) => windowDeclaration | (TRAIT) => typeDeclaration (trait) | (ENUM) => enumDeclaration | typeDeclaration (class) END
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • entryPointDeclaration

      public EntryPointDeclarationDescr entryPointDeclaration(DeclareDescrBuilder ddb) throws org.antlr.runtime.RecognitionException
      entryPointDeclaration := ENTRY-POINT stringId annotation* END
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • windowDeclaration

      public WindowDeclarationDescr windowDeclaration(DeclareDescrBuilder ddb) throws org.antlr.runtime.RecognitionException
      windowDeclaration := WINDOW ID annotation* lhsPatternBind END
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • enumDeclaration

      public EnumDeclarationDescr enumDeclaration(DeclareDescrBuilder ddb) throws org.antlr.runtime.RecognitionException
      Throws:
      org.antlr.runtime.RecognitionException

    • typeDeclaration

      public TypeDeclarationDescr typeDeclaration(DeclareDescrBuilder ddb, boolean isTrait) throws org.antlr.runtime.RecognitionException
      typeDeclaration := [TYPE] qualifiedIdentifier (EXTENDS qualifiedIdentifier)? annotation* field* END
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • function

      public FunctionDescr function(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      function := FUNCTION type? ID parameters(typed) chunk_{_}
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • query

      public RuleDescr query(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      query := QUERY stringId parameters? annotation* lhsExpression END
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • rule

      public RuleDescr rule(PackageDescrBuilder pkg) throws org.antlr.runtime.RecognitionException
      rule := RULE stringId (EXTENDS stringId)? annotation* attributes? lhs? rhs END
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • attribute

      public AttributeDescr attribute(AttributeSupportBuilder<?> as)
      attribute := salience | enabled | ( NO-LOOP | AUTO-FOCUS | LOCK-ON-ACTIVE | REFRACT ) BOOLEAN? | ( AGENDA-GROUP | ACTIVATION-GROUP | RULEFLOW-GROUP | DATE-EFFECTIVE | DATE-EXPIRES | DIALECT ) STRING | CALENDARS STRING (COMMA STRING)* | TIMER ( DECIMAL | chunk_(_) ) | DURATION ( DECIMAL | chunk_(_) ) The above syntax is not quite how this is parsed, because the soft keyword is determined by look-ahead and passed on to one of the x-Attribute methods (booleanAttribute, stringAttribute, stringListAttribute, intOrChunkAttribute) which will actually gobble the tokens.
      Returns:

    • defaultConsequence

      public void defaultConsequence(RuleDescrBuilder rule)
      defaultConsequence := THEN chunk
      Parameters:
      rule -

    • namedConsequence

      public void namedConsequence(RuleDescrBuilder rule)
      namedConsequence := THEN LEFT_SQUARE ID RIGHT_SQUARE chunk
      Parameters:
      rule -

    • type

      public String type() throws org.antlr.runtime.RecognitionException
      Matches a type name type := ID typeArguments? ( DOT ID typeArguments? )* (LEFT_SQUARE RIGHT_SQUARE)*
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • typeArguments

      public String typeArguments() throws org.antlr.runtime.RecognitionException
      Matches type arguments typeArguments := LESS typeArgument (COMMA typeArgument)* GREATER
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • typeArgument

      public String typeArgument() throws org.antlr.runtime.RecognitionException
      Matches a type argument typeArguments := QUESTION (( EXTENDS | SUPER ) type )? | type ;
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • qualifiedIdentifier

      public String qualifiedIdentifier() throws org.antlr.runtime.RecognitionException
      Matches a qualified identifier qualifiedIdentifier := ID ( DOT ID )*
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • conditionalExpression

      public String conditionalExpression() throws org.antlr.runtime.RecognitionException
      Matches a conditional expression
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • conditionalOrExpression

      public String conditionalOrExpression() throws org.antlr.runtime.RecognitionException
      Matches a conditional || expression
      Returns:
      Throws:
      org.antlr.runtime.RecognitionException

    • chunk

      public String chunk(int leftDelimiter, int rightDelimiter, int location)
      Matches a chunk started by the leftDelimiter and ended by the rightDelimiter.
      Specified by:
      chunk in interface DRLParser
      Parameters:
      leftDelimiter -
      rightDelimiter -
      location -
      Returns:
      the matched chunk without the delimiters

    • recoverFromMismatchedToken

      protected org.antlr.runtime.Token recoverFromMismatchedToken(org.antlr.runtime.TokenStream input, int ttype, String text, int[] follow) throws org.antlr.runtime.RecognitionException
      Attempt to recover from a single missing or extra token. EXTRA TOKEN LA(1) is not what we are looking for. If LA(2) has the right token, however, then assume LA(1) is some extra spurious token. Delete it and LA(2) as if we were doing a normal match(), which advances the input. MISSING TOKEN If current token is consistent with what could come after ttype then it is ok to "insert" the missing token, else throw exception For example, Input "i=(3;" is clearly missing the ')'. When the parser returns from the nested call to expr, it will have call chain: stat -> expr -> atom and it will be trying to match the ')' at this point in the derivation: => ID '=' '(' INT ')' ('+' atom)* ';' ^ match() will see that ';' doesn't match ')' and report a mismatched token error. To recover, it sees that LA(1)==';' is in the set of tokens that can follow the ')' token reference in rule atom. It can assume that you forgot the ')'.
      Throws:
      org.antlr.runtime.RecognitionException

    • mismatchIsUnwantedToken

      public boolean mismatchIsUnwantedToken(org.antlr.runtime.TokenStream input, int ttype, String text)

    • mismatchIsMissingToken

      public boolean mismatchIsMissingToken(org.antlr.runtime.TokenStream input, int[] follow)