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Java Source Code / Java Documentation » Parser » Rats Parser Generators » xtc.parser

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

xtc.tree .Visitor

xtc.parser .Generifier

Generifier

public class Generifier extends Visitor (Code)

Visitor to add generic nodes as semantic values.

For any production with pseudotype "generic" that does not contain any direct left-recursions (which is also called a generic node production), this visitor adds the appropriate GenericNodeValue generic node value elements, which create a xtc.tree.GNode generic node as the productions' semantic value. The children of such a generic node are the matched component values of the production, though voided elements, void nonterminals, and character terminals are not included. If an alternative assigns CodeGenerator.VALUE either through a binding or a semantic action, that alternative's semantic value is the specified semantic value and not a newly generated generic node. This visitor requires that all nested choices that do not appear as the last element in a sequence have been lifted. It also assumes that the entire grammar is contained in a single module.

Note that this visitor does not process generic productions that contain direct left-recursions; they are processed by DirectLeftRecurser .
author:
Robert Grimm
version:
$Revision: 1.55 $

Field Summary
final public static String	MARKER The marker for synthetic variables.
final protected Analyzer	analyzer The analyzer utility.
protected List<Binding>	children The list of variables representing the children of the generic node to be created.
protected List<NodeMarker>	markers The list of node markers.
final protected Runtime	runtime The runtime.

Constructor Summary
public	Generifier(Runtime runtime, Analyzer analyzer) Create a new generifier.

Method Summary
protected Binding	bind(Element e) Create a binding for the specified element.
public static boolean	isGeneric(FullProduction p) Determine whether the specified production is a generic node or a generic recursion production. Parameters: p - The production.
public static boolean	isGenericNode(FullProduction p) Determine whether the specified production is a generic node production.
public static boolean	isGenericRecursion(FullProduction p) Determine whether the specified production is a generic recursion production.
public static void	markGenericNode(FullProduction p, boolean verbose) Mark the specified production as a generic node production.
public static void	markGenericRecursion(FullProduction p, boolean verbose) Mark the specified production as a generic recursion production.
public void	visit(Module m) Visit the specified grammar.
public void	visit(FullProduction p) Visit the specified production.
public Element	visit(OrderedChoice c) Visit the specified ordered choice.
public Element	visit(Repetition r) Visit the specified repetition.
public Element	visit(Option o) Visit the specified option.
public Element	visit(Sequence s) Visit the specified sequence.
public Element	visit(Binding b) Visit the specified binding.
public Element	visit(StringMatch m) Visit the specified string match.
public Element	visit(NonTerminal nt) Visit the specified nonterminal.
public Element	visit(StringLiteral l) Visit the specified string literal.
public Element	visit(ParseTreeNode n) Visit the specified parse tree node.
public Element	visit(NullLiteral l) Visit the specified null literal.
public Element	visit(NodeMarker m) Visit the specified node marker.
public Element	visit(Element e) Visit the specified element.

Field Detail

MARKER
final public static String MARKER(Code)
	The marker for synthetic variables.

analyzer
final protected Analyzer analyzer(Code)
	The analyzer utility.

children
protected List<Binding> children(Code)
	The list of variables representing the children of the generic node to be created.

markers
protected List<NodeMarker> markers(Code)
	The list of node markers.

runtime
final protected Runtime runtime(Code)
	The runtime.

Constructor Detail

Generifier
public Generifier(Runtime runtime, Analyzer analyzer)(Code)
	Create a new generifier. Parameters: runtime - The runtime. Parameters: analyzer - The analyzer utility.

Method Detail

bind
protected Binding bind(Element e)(Code)
	Create a binding for the specified element. This method also adds the name of the bound variable to the end of the list of children. Parameters: e - The element to bind. The corresponding binding.

isGeneric
public static boolean isGeneric(FullProduction p)(Code)
	Determine whether the specified production is a generic node or a generic recursion production. Parameters: p - The production. `true` if the specified production is a genericnode or generic recursion production.

isGenericNode
public static boolean isGenericNode(FullProduction p)(Code)
	Determine whether the specified production is a generic node production. A production is a generic node production if its semantic value is an automatically generated generic node with the component values as its children. Parameters: p - The production. `true` if the specified production isa generic node production.

isGenericRecursion
public static boolean isGenericRecursion(FullProduction p)(Code)
	Determine whether the specified production is a generic recursion production. A production is a generic recursion production if its semantic value is an automatically generated generic node and the production, as specified, contains one or more direct left-recursions that can automatically be transformed into the corresponding right-recursions. See Also: DirectLeftRecurser Parameters: p - The production. `true` if the specified production isa generic recursion production.

markGenericNode
public static void markGenericNode(FullProduction p, boolean verbose)(Code)
	Mark the specified production as a generic node production. Parameters: p - The production. Parameters: verbose - The flag for whether to be verbose.

markGenericRecursion
public static void markGenericRecursion(FullProduction p, boolean verbose)(Code)
	Mark the specified production as a generic recursion production. Parameters: p - The production. Parameters: verbose - The flag for whether to be verbose.

visit
public void visit(Module m)(Code)
	Visit the specified grammar.

visit
public void visit(FullProduction p)(Code)
	Visit the specified production.

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(Binding b)(Code)
	Visit the specified binding.

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

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

visit
public Element visit(StringLiteral l)(Code)
	Visit the specified string literal.

visit
public Element visit(ParseTreeNode n)(Code)
	Visit the specified parse tree node.

visit
public Element visit(NullLiteral l)(Code)
	Visit the specified null literal.

visit
public Element visit(NodeMarker m)(Code)
	Visit the specified node marker.

visit
public Element visit(Element e)(Code)
	Visit the specified element. This method provides the default implementation for predicates, voided elements, character terminals, (parser) actions, and value elements.

Methods inherited from xtc.tree.Visitor

public Object dispatch(Node node)(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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