Package eu.bandm.tools.xantlrtdom

Class ReservedWordLexer

java.lang.Object

eu.bandm.tools.xantlrtdom.ReservedWordLexer

public class ReservedWordLexer
extends Object

An auxiliary class needed to back-link one and the same pre-defined antlr-lexer (from a runtime system) to one of many varying, newly generated parsers generated against this lexer.
This is needed in case the parser defines specific keywords which are (naturally) not known to the common basic lexer.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	keyword_prefix

Constructor Summary

Constructors

Constructor	Description
ReservedWordLexer()

Method Summary

Modifier and Type	Method	Description
static void	link(Class<?> tokenTypes, antlr.CharScanner lexer, Hashtable<antlr.ANTLRHashString,Integer> hash)	Links the token definitions in the Class type argument to the hashtable of the given lexer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

keyword_prefix

public static final String keyword_prefix

See Also:

• Constant Field Values

Constructor Details

ReservedWordLexer

public ReservedWordLexer()

Method Details

link

public static void link(Class<?> tokenTypes,
 antlr.CharScanner lexer,
 Hashtable<antlr.ANTLRHashString,Integer> hash)

Links the token definitions in the Class type argument to the hashtable of the given lexer. Reflection is used.
Since the token table is protected, it must be given to this method as a separate argument. The "lexer" argument is needed because this token table contains special "hash strings", which can only be created knowing the lexer.
The first use was with the pre-defined runtime system of eu.bandm.tools.keywordgrammar.runtime.Lexer
This version runs with antlr-2.7.4
The typical call of this method can be found in eu.bandm.bpm.bpmn.test.Test (or in eu.bandm.bpm.hr.base.Reposit)

   final KeywordLexer lexer 
      = new KeywordLexer(in){
          {ReservedWordLexer.link(BpmnParserTokenTypes.class, this, this.literal
          }};