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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.Inliner

Inliner
public class Inliner extends GrammarVisitor (Code)
Visitor to inline productions. If cost-based inlining is enabled, this visitor inlines productions with a CostEstimator costestimate less or equal to the Inliner.MAX_COST maximum cost . However, to avoid changing a production's semantic value, cost-based inlining is limited to void, text-only, and token-level productions. Independent of whether cost-based inlining is enabled or not, this visitor inlines productions that are referenced from a production consisting solely of a nonterminal (which, optionally, may be bound to CodeGenerator.VALUE ). Note that generic productions are never inlined; neither are productions with the state attribute.

Note that, to be effective, this visitor requires that text-only productions have been TextTester marked as such. Similarly, token-level productions need to have beeen Tokenizer marked as such. Further note that, if this visitor inlines productions, the resulting grammar needs to be Simplifier simplified before further processing. Also note that this visitor may create new opportunities for the DeadProductionEliminator elimination of dead productions . This visitor assumes that the entire grammar is contained in a single module.
author:
   Robert Grimm
version:
   $Revision: 1.52 $



Field Summary
final public static  booleanINLINE_PERSISTENT
     The flag for whether to inline non-transient productions.
final public static  intMAX_COST
     The maximum cost for inlining productions at arbitrary positions.
protected  booleanattributeState
     Flag for whether the grammar has the state attribute.
protected  booleaninlined
     Flag for whether this production inliner has inlined a production.

Constructor Summary
public  Inliner(Runtime runtime, Analyzer analyzer)
     Create a new production inliner.

Method Summary
protected  voidinlined(Production p)
     Record that the specified production has been inlined and, if necessary, print a message to the console.
protected  booleanisBasic(Production p)
     Determine whether the specified production is void, text-only, or token-level.
Parameters:
  p - The production.
public  Objectvisit(Module m)
     Process the specified grammar.
Parameters:
  m - The grammar module.
public  Elementvisit(NonTerminal nt)
     Visit the specified nonterminal.

Field Detail
INLINE_PERSISTENT
final public static boolean INLINE_PERSISTENT(Code)
The flag for whether to inline non-transient productions.



MAX_COST
final public static int MAX_COST(Code)
The maximum cost for inlining productions at arbitrary positions.



attributeState
protected boolean attributeState(Code)
Flag for whether the grammar has the state attribute.



inlined
protected boolean inlined(Code)
Flag for whether this production inliner has inlined a production.




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




Method Detail
inlined
protected void inlined(Production p)(Code)
Record that the specified production has been inlined and, if necessary, print a message to the console.
Parameters:
  p - The production.



isBasic
protected boolean isBasic(Production p)(Code)
Determine whether the specified production is void, text-only, or token-level.
Parameters:
  p - The production. true if the production is either text-onlyor void.



visit
public Object visit(Module m)(Code)
Process the specified grammar.
Parameters:
  m - The grammar module. Boolean.TRUE if the grammar has been modified,otherwise Boolean.FALSE.



visit
public Element visit(NonTerminal nt)(Code)
Visit the specified nonterminal.



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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