atn_simulator.go

// Copyright (c) 2012-2022 The ANTLR Project. All rights reserved.
// Use of this file is governed by the BSD 3-clause license that
// can be found in the LICENSE.txt file in the project root.

package antlr

import "context"

var ATNSimulatorError = NewDFAState(0x7FFFFFFF, NewATNConfigSet(false))

type IATNSimulator interface {
	SharedContextCache() *PredictionContextCache
	ATN() *ATN
	DecisionToDFA() []*DFA
}

type BaseATNSimulator struct {
	atn                *ATN
	sharedContextCache *PredictionContextCache
	decisionToDFA      []*DFA
	ctx                context.Context
}

func (b *BaseATNSimulator) getCachedContext(context *PredictionContext) *PredictionContext {
	if b.sharedContextCache == nil {
		return context
	}

	//visited := NewJMap[*PredictionContext, *PredictionContext, Comparator[*PredictionContext]](pContextEqInst, PredictionVisitedCollection, "Visit map in getCachedContext()")
	visited := NewVisitRecord()
	return getCachedBasePredictionContext(context, b.sharedContextCache, visited)
}

func (b *BaseATNSimulator) SharedContextCache() *PredictionContextCache {
	return b.sharedContextCache
}

func (b *BaseATNSimulator) ATN() *ATN {
	return b.atn
}

func (b *BaseATNSimulator) DecisionToDFA() []*DFA {
	return b.decisionToDFA
}

func (p *BaseATNSimulator) GetContextError() error {
	if p.ctx == nil {
		return nil
	}
	return p.ctx.Err()
}

func (p *BaseATNSimulator) SetContext(ctx context.Context) {
	p.ctx = ctx
}