net.sourceforge.czt.parser.circus
Class KeywordScanner

java.lang.Object
  net.sourceforge.czt.parser.circus.KeywordScanner

All Implemented Interfaces:

net.sourceforge.czt.java_cup.runtime.Scanner

public class KeywordScanner
extends java.lang.Object
implements net.sourceforge.czt.java_cup.runtime.Scanner

This is a keyword lexer (part of context-sensitive lexis) for Circus specifications in unicode format.

According to the ISO Standard for Z, the lexis for Z specifications consists of two phases: the context-free lexis and the context-sensitive lexis. This class is an implementation of sections 7.4.2 and 7.4.3 of the ISO Z standard, which describes the context-sensitive lexis.

This class transforms a stream of tokens into another stream of tokens. The input is usually provided by the ContextFreeScanner. Each DECORWORD token whos spelling is exactly that of a keyword is mapped to the corresponding keyword token. All other tokens are left unchanged.

Constructor Summary

KeywordScanner(ContextFreeScanner scanner, java.util.Properties properties)

Method Summary

net.sourceforge.czt.java_cup.runtime.Symbol

next_token()

Methods inherited from class java.lang.Object

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

Constructor Detail

KeywordScanner

public KeywordScanner(ContextFreeScanner scanner,
                      java.util.Properties properties)

Method Detail

next_token

public net.sourceforge.czt.java_cup.runtime.Symbol next_token()
                                                       throws java.io.IOException

Specified by:

next_token in interface net.sourceforge.czt.java_cup.runtime.Scanner

Throws:

java.io.IOException