xtc.parser
Class TextTester

java.lang.Object
  xtc.tree.Visitor
      xtc.parser.TextTester

public class TextTester
extends Visitor

Visitor to identify text-only productions. A production is text-only if it does not define a semantic value beyond declaring a string value and references only other text-only productions (if any). Notably, a text-only production may not contain parser actions, semantic actions that reference CodeGenerator.VALUE, or bindings to CodeGenerator.VALUE. Note that this visitor only detects such productions but does not add appropriate value elements.

Version:

$Revision: 1.42 $

Author:

Robert Grimm

See Also:

Transformer

Field Summary

protected Analyzer	analyzer The analyzer utility.
protected boolean	isTextOnly Flag for whether the current production is text-only.
protected Runtime	runtime The runtime.

Constructor Summary

TextTester(Runtime runtime, Analyzer analyzer)
Create a new text tester.

Method Summary

static void	markTextOnly(Production p, boolean verbose) Mark the specified production as text-only.
void	visit(Action a) Visit the specified action.
void	visit(Binding b) Visit the specified binding.
void	visit(CharCase c) Visit the specified character case.
void	visit(CharSwitch s) Visit the specified character switch.
void	visit(Element e) Visit the specified element.
void	visit(Grammar g) Visit the specified grammar.
void	visit(Module m) Visit the specified grammar.
void	visit(NodeMarker m) Visit the specified node marker.
void	visit(NonTerminal nt) Visit the specified nonterminal.
void	visit(NullLiteral l) Visit the specified null literal.
void	visit(OrderedChoice c) Visit the specified ordered choice.
void	visit(ParserAction pa) Visit the specified parser action.
void	visit(Predicate p) Visit the specified predicate.
void	visit(Production p) Visit the specified production.
void	visit(Sequence s) Visit the specified sequence.
void	visit(Terminal t) Visit the specified terminal.
void	visit(UnaryOperator op) Visit the specified unary operator.

Methods inherited from class xtc.tree.Visitor

dispatch, equals, hashCode, iterate, map, mapInPlace, unableToVisit, visit

Methods inherited from class java.lang.Object

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

Field Detail

runtime

protected final Runtime runtime

The runtime.

analyzer

protected final Analyzer analyzer

The analyzer utility.

isTextOnly

protected boolean isTextOnly

Flag for whether the current production is text-only.

Constructor Detail

TextTester

public TextTester(Runtime runtime,
                  Analyzer analyzer)

Create a new text tester.

Parameters:

runtime - The runtime.

analyzer - The analyzer utility.

Method Detail

visit

public void visit(Grammar g)

Visit the specified grammar.

visit

public void visit(Module m)

Visit the specified grammar.

visit

public void visit(Production p)

Visit the specified production.

visit

public void visit(OrderedChoice c)

Visit the specified ordered choice.

visit

public void visit(Sequence s)

Visit the specified sequence.

visit

public void visit(Predicate p)

Visit the specified predicate.

visit

public void visit(Binding b)

Visit the specified binding.

visit

public void visit(NonTerminal nt)

Visit the specified nonterminal.

visit

public void visit(CharCase c)

Visit the specified character case.

visit

public void visit(CharSwitch s)

Visit the specified character switch.

visit

public void visit(Terminal t)

Visit the specified terminal.

visit

public void visit(UnaryOperator op)

Visit the specified unary operator. This method provides the default implementation for repetitions, options, syntactic predicates, voided elements, and string matches.

visit

public void visit(NullLiteral l)

Visit the specified null literal.

visit

public void visit(NodeMarker m)

Visit the specified node marker.

visit

public void visit(Action a)

Visit the specified action.

visit

public void visit(ParserAction pa)

Visit the specified parser action.

visit

public void visit(Element e)

Visit the specified element. This method provides the default implementation for parse tree nodes and value elements.

markTextOnly

public static void markTextOnly(Production p,
                                boolean verbose)

Mark the specified production as text-only.

Parameters:

p - The production.

verbose - The flag for whether to be verbose.