Class LeftRecursiveRule

java.lang.Object

org.antlr.v4.tool.Rule

org.antlr.v4.tool.LeftRecursiveRule

All Implemented Interfaces:

AttributeResolver

public class LeftRecursiveRule
extends Rule

Field Summary

Fields

Modifier and Type	Field	Description
List<Pair<GrammarAST, String>>	leftRecursiveRuleRefLabels	Did we delete any labels on direct left-recur refs? Points at ID of ^(= ID el)
RuleAST	originalAST
OrderedHashMap<Integer, LeftRecursiveRuleAltInfo>	recOpAlts
List<LeftRecursiveRuleAltInfo>	recPrimaryAlts

Fields inherited from class Rule

actionIndex, actions, alt, args, ast, caseInsensitive, exceptions, finallyAction, g, index, isStartRule, locals, mode, modifiers, name, namedActions, numberOfAlts, predefinedRulePropertiesDict, retvals, validLexerCommands

Constructor Summary

Constructors

Constructor	Description
LeftRecursiveRule(Grammar g, String name, RuleAST ast)

Method Summary

Modifier and Type	Method	Description
Map<String, List<Pair<Integer,AltAST>>>	getAltLabels()	Get -> labels from those alts we deleted for left-recursive rules.
RuleAST	getOriginalAST()
int	getOriginalNumberOfAlts()	Used for recursive rules (subclass), which have 1 alt, but many original alts
int[]	getPrimaryAlts()	Return an array that maps predicted alt from primary decision to original alt of rule.
int[]	getRecursiveOpAlts()	Return an array that maps predicted alt from recursive op decision to original alt of rule.
List<AltAST>	getUnlabeledAltASTs()
boolean	hasAltSpecificContexts()

Methods inherited from class Rule

defineActionInAlt, defineLexerAction, definePredicateInAlt, equals, getAnyLabelDef, getElementLabelDefs, getElementLabelNames, getPredefinedScope, getTokenRefs, hashCode, isFragment, resolveRetvalOrProperty, resolvesToAttributeDict, resolvesToLabel, resolvesToListLabel, resolvesToToken, resolveToAttribute, resolveToAttribute, resolveToRule, toString

Methods inherited from class Object

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

Field Details

recPrimaryAlts

public List<LeftRecursiveRuleAltInfo> recPrimaryAlts

recOpAlts

public OrderedHashMap<Integer, LeftRecursiveRuleAltInfo> recOpAlts

originalAST

public RuleAST originalAST

leftRecursiveRuleRefLabels

public List<Pair<GrammarAST, String>> leftRecursiveRuleRefLabels

Did we delete any labels on direct left-recur refs? Points at ID of ^(= ID el)

Constructor Details

LeftRecursiveRule

public LeftRecursiveRule(Grammar g,
 String name,
 RuleAST ast)

Method Details

hasAltSpecificContexts

public boolean hasAltSpecificContexts()

Overrides:

hasAltSpecificContexts in class Rule

getOriginalNumberOfAlts

public int getOriginalNumberOfAlts()

Description copied from class: Rule

Used for recursive rules (subclass), which have 1 alt, but many original alts

Overrides:

getOriginalNumberOfAlts in class Rule

getOriginalAST

public RuleAST getOriginalAST()

getUnlabeledAltASTs

public List<AltAST> getUnlabeledAltASTs()

Overrides:

getUnlabeledAltASTs in class Rule

getPrimaryAlts

public int[] getPrimaryAlts()

Return an array that maps predicted alt from primary decision to original alt of rule. For following rule, return [0, 2, 4] e : e '*' e | INT | e '+' e | ID ; That maps predicted alt 1 to original alt 2 and predicted 2 to alt 4.

Since:

4.5.1

getRecursiveOpAlts

public int[] getRecursiveOpAlts()

Return an array that maps predicted alt from recursive op decision to original alt of rule. For following rule, return [0, 1, 3] e : e '*' e | INT | e '+' e | ID ; That maps predicted alt 1 to original alt 1 and predicted 2 to alt 3.

Since:

4.5.1

getAltLabels

public Map<String, List<Pair<Integer,AltAST>>> getAltLabels()

Get -> labels from those alts we deleted for left-recursive rules.

Overrides:

getAltLabels in class Rule