antlr
Class TreeBlockContext

java.lang.Object
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  +--antlr.BlockContext
        |
        +--antlr.TreeBlockContext

class TreeBlockContext

extends BlockContext

The context needed to add root,child elements to a Tree. There is only one alternative (i.e., a list of children). We subclass to specialize. MakeGrammar.addElementToCurrentAlt will work correctly now for either a block of alts or a Tree child list. The first time addAlternativeElement is called, it sets the root element rather than adding it to one of the alternative lists. Rather than have the grammar duplicate the rules for grammar atoms etc... we use the same grammar and same refToken behavior etc... We have to special case somewhere and here is where we do it.

Field Summary

(package private) int	altNum
(package private) AlternativeBlock	block
(package private) BlockEndElement	blockEnd
protected boolean	nextElementIsRoot

Constructor Summary

(package private)

TreeBlockContext()

Method Summary

void	addAlternativeElement(AlternativeElement e)
Alternative	currentAlt()
AlternativeElement	currentElement()

Methods inherited from class java.lang.Object

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

Field Detail

nextElementIsRoot

protected boolean nextElementIsRoot

block

AlternativeBlock block

altNum

int altNum

blockEnd

BlockEndElement blockEnd

Constructor Detail

TreeBlockContext

TreeBlockContext()

Method Detail

addAlternativeElement

public void addAlternativeElement(AlternativeElement e)

Overrides:

addAlternativeElement in class BlockContext

currentAlt

public Alternative currentAlt()

currentElement

public AlternativeElement currentElement()