Package org.parboiled.matchers

Class ProxyMatcher

java.lang.Object

org.parboiled.matchers.ProxyMatcher

All Implemented Interfaces:

java.lang.Cloneable, Matcher, Rule, GraphNode<Matcher>

public class ProxyMatcher
extends java.lang.Object
implements Matcher, java.lang.Cloneable

A Matcher that delegates all Rule and Matcher interface methods to another Matcher. It can also hold a label and a leaf marker and lazily apply these to the underlying Matcher once it is available.

Constructor Summary

Constructors

Constructor	Description
ProxyMatcher()

Method Summary

Modifier and Type	Method	Description
<R> R	accept(MatcherVisitor<R> visitor)	Accepts the given matcher visitor.
boolean	areMismatchesMemoed()
boolean	areSubnodesSuppressed()
void	arm(Matcher target)	Supplies this ProxyMatcher with its underlying delegate.
java.util.List<Matcher>	getChildren()	Returns the sub nodes of this node.
java.lang.String	getLabel()
MatcherContext	getSubContext(MatcherContext context)	Creates a context for the matching of this matcher using the given parent context.
java.lang.Object	getTag()	Retrieves a previously set tag object.
boolean	hasCustomLabel()
boolean	isNodeSkipped()
boolean	isNodeSuppressed()
Rule	label(java.lang.String label)	Attaches a label to this Rule.
<V> boolean	match(MatcherContext<V> context)	Tries a match on the given MatcherContext.
Rule	memoMismatches()	Enables memoization of rule mismatches for consecutive rule applications at the same input location.
void	setLabel(java.lang.String label)
void	setTag(java.lang.Object tagObject)	Associates an arbitrary object with this matcher.
Rule	skipNode()	Instructs parboiled to not create a parse tree node for this rule.
Rule	suppressNode()	Instructs parboiled to not create a parse tree node for this rule and all subrules, which can significantly increase parsing performance.
Rule	suppressSubnodes()	Instructs parboiled to not create parse tree nodes for the subrules of this rule, which can significantly increase parsing performance.
java.lang.String	toString()
static Matcher	unwrap(Matcher matcher)	Retrieves the innermost Matcher that is not a ProxyMatcher.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProxyMatcher

public ProxyMatcher()

Method Detail

getChildren

public java.util.List<Matcher> getChildren()

Description copied from interface: GraphNode

Returns the sub nodes of this node.

Specified by:

getChildren in interface GraphNode<Matcher>

Returns:

the sub nodes

setLabel

public void setLabel(java.lang.String label)

match

public <V> boolean match(MatcherContext<V> context)

Description copied from interface: Matcher

Tries a match on the given MatcherContext.

Specified by:

match in interface Matcher

Parameters:

context - the MatcherContext

Returns:

true if the match was successful

getLabel

public java.lang.String getLabel()

Specified by:

getLabel in interface Matcher

Returns:

the label of the matcher (which is identical to the label of the Rule this matcher matches)

hasCustomLabel

public boolean hasCustomLabel()

Specified by:

hasCustomLabel in interface Matcher

Returns:

true if this matcher has been assigned a custom label

isNodeSuppressed

public boolean isNodeSuppressed()

Specified by:

isNodeSuppressed in interface Matcher

Returns:

true if this matcher has been marked with @SuppressNode

areSubnodesSuppressed

public boolean areSubnodesSuppressed()

Specified by:

areSubnodesSuppressed in interface Matcher

Returns:

true if this matcher has been marked with @SuppressSubnodes

isNodeSkipped

public boolean isNodeSkipped()

Specified by:

isNodeSkipped in interface Matcher

Returns:

true if this matcher has been marked with @SkipNode

areMismatchesMemoed

public boolean areMismatchesMemoed()

Specified by:

areMismatchesMemoed in interface Matcher

Returns:

true if this matcher has been marked with @MemoMismatches

setTag

public void setTag(java.lang.Object tagObject)

Description copied from interface: Matcher

Associates an arbitrary object with this matcher. Used for example during profiling and packrat parsing. The matcher implementations themselves completely ignore the contents of this property. It purely serves as a performance optimization for ParseRunners and/or MatchHandlers and saves these from the need to use Map<Matcher, XYZ> structures for associating internal objects with matchers.

Specified by:

setTag in interface Matcher

Parameters:

tagObject - the tag object

getTag

public java.lang.Object getTag()

Description copied from interface: Matcher

Retrieves a previously set tag object.

Specified by:

getTag in interface Matcher

Returns:

the tag object or null if none set

accept

public <R> R accept(MatcherVisitor<R> visitor)

Description copied from interface: Matcher

Accepts the given matcher visitor.

Specified by:

accept in interface Matcher

Parameters:

visitor - the visitor

Returns:

the value returned by the given visitor

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

label

public Rule label(java.lang.String label)

Description copied from interface: Rule

Attaches a label to this Rule. Corresponds to the @Label annotation.

Specified by:

label in interface Rule

Parameters:

label - the label

Returns:

this Rule

suppressNode

public Rule suppressNode()

Description copied from interface: Rule

Instructs parboiled to not create a parse tree node for this rule and all subrules, which can significantly increase parsing performance. Corresponds to the @SuppressNode annotation.

Specified by:

suppressNode in interface Rule

Returns:

this Rule

suppressSubnodes

public Rule suppressSubnodes()

Description copied from interface: Rule

Instructs parboiled to not create parse tree nodes for the subrules of this rule, which can significantly increase parsing performance. Corresponds to the @SuppressSubnodes annotation.

Specified by:

suppressSubnodes in interface Rule

Returns:

this Rule

skipNode

public Rule skipNode()

Description copied from interface: Rule

Instructs parboiled to not create a parse tree node for this rule. The parse tree nodes of all subrules are directly attached to the parent of this rule (or more correctly: the first ancestor not having been marked skipNode(). Note that, even though a rule marked as skipNode() does not create a parse tree node of its own and is therefore "invisible" in the parse tree, the rule still exists as a regular rule in the rule tree and is accompanied by a "regular" rule Context during rule matching. Corresponds to the @SkipNode annotation.

Specified by:

skipNode in interface Rule

Returns:

this Rule

memoMismatches

public Rule memoMismatches()

Description copied from interface: Rule

Enables memoization of rule mismatches for consecutive rule applications at the same input location.

Specified by:

memoMismatches in interface Rule

Returns:

this rule

arm

public void arm(Matcher target)

Supplies this ProxyMatcher with its underlying delegate.

Parameters:

target - the Matcher to delegate to

unwrap

public static Matcher unwrap(Matcher matcher)

Retrieves the innermost Matcher that is not a ProxyMatcher.

Parameters:

matcher - the matcher to unwrap

Returns:

the given instance if it is not a ProxyMatcher, otherwise the innermost non-proxy Matcher

getSubContext

public MatcherContext getSubContext(MatcherContext context)

Description copied from interface: Matcher

Creates a context for the matching of this matcher using the given parent context.

Specified by:

getSubContext in interface Matcher

Parameters:

context - the parent context

Returns:

the context this matcher is to be run in