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Java Source Code / Java Documentation » Parser » Rats Parser Generators » xtc.parser 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


xtc.parser.GrammarVisitor
   xtc.parser.Simplifier

Simplifier
public class Simplifier extends GrammarVisitor (Code)
Visitor to simplify a grammar. This visitor folds nested choices and sequences into the embedding choice or sequence, eliminates choices and sequences with only one alternative or element (with the exception of the top-level choice of a production), and reduces repetitions and options to their simplest form. It also reduces trivial character classes and string literals to character literals. Note that the resulting grammar may violate the requirements of CodeGenerator code generation .
author:
   Robert Grimm
version:
   $Revision: 1.54 $



Constructor Summary
public  Simplifier(Runtime runtime, Analyzer analyzer)
     Create a new simplifier.

Method Summary
public  Elementvisit(OrderedChoice c)
     Visit the specified ordered choice.
public  Elementvisit(Repetition r)
     Visit the specified repetition.
public  Elementvisit(Option o)
     Visit the specified option.
public  Elementvisit(Sequence s)
     Visit the specified sequence.
public  Elementvisit(VoidedElement v)
     Visit the specified voided element.
public  Elementvisit(Binding b)
     Visit the specified binding.
public  Elementvisit(StringMatch m)
     Visit the specified string match.
public  Elementvisit(CharClass c)
     Visit the specified character class.


Constructor Detail
Simplifier
public Simplifier(Runtime runtime, Analyzer analyzer)(Code)
Create a new simplifier.
Parameters:
  runtime - The runtime.
Parameters:
  analyzer - The analyzer utility.




Method Detail
visit
public Element visit(OrderedChoice c)(Code)
Visit the specified ordered choice.



visit
public Element visit(Repetition r)(Code)
Visit the specified repetition.



visit
public Element visit(Option o)(Code)
Visit the specified option.



visit
public Element visit(Sequence s)(Code)
Visit the specified sequence.



visit
public Element visit(VoidedElement v)(Code)
Visit the specified voided element.



visit
public Element visit(Binding b)(Code)
Visit the specified binding.



visit
public Element visit(StringMatch m)(Code)
Visit the specified string match.



visit
public Element visit(CharClass c)(Code)
Visit the specified character class.



Fields inherited from xtc.parser.GrammarVisitor
final protected Analyzer analyzer(Code)(Java Doc)
protected boolean isBound(Code)(Java Doc)
protected boolean isLastElement(Code)(Java Doc)
protected boolean isPredicate(Code)(Java Doc)
protected boolean isRepeatedOnce(Code)(Java Doc)
protected boolean isTopLevel(Code)(Java Doc)
protected boolean isVoided(Code)(Java Doc)
protected boolean needsSequence(Code)(Java Doc)
final protected Runtime runtime(Code)(Java Doc)
protected boolean transformInPlace(Code)(Java Doc)

Methods inherited from xtc.parser.GrammarVisitor
public Object visit(Grammar g)(Code)(Java Doc)
public Object visit(Module m)(Code)(Java Doc)
public Production visit(Production p)(Code)(Java Doc)
public Element visit(OrderedChoice c)(Code)(Java Doc)
public Element visit(Repetition r)(Code)(Java Doc)
public Element visit(Option o)(Code)(Java Doc)
public Element visit(Sequence s)(Code)(Java Doc)
public Element visit(Predicate p)(Code)(Java Doc)
public Element visit(SemanticPredicate p)(Code)(Java Doc)
public Element visit(VoidedElement v)(Code)(Java Doc)
public Element visit(Binding b)(Code)(Java Doc)
public Element visit(StringMatch m)(Code)(Java Doc)
public CharCase visit(CharCase c)(Code)(Java Doc)
public Element visit(CharSwitch s)(Code)(Java Doc)
public Element visit(ParserAction pa)(Code)(Java Doc)
public Element visit(Element e)(Code)(Java Doc)

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