/*
* [The "BSD license"]
* Copyright (c) 2013 Terence Parr
* Copyright (c) 2013 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.runtime.atn;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.misc.IntervalSet;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Nullable;
import org.antlr.v4.runtime.misc.Pair;
import java.io.InvalidClassException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.UUID;
/**
*
* @author Sam Harwell
*/
public class ATNDeserializer {
public static final int SERIALIZED_VERSION;
static {
/* This value should never change. Updates following this version are
* reflected as change in the unique ID SERIALIZED_UUID.
*/
SERIALIZED_VERSION = 3;
}
/**
* This is the earliest supported serialized UUID.
*/
private static final UUID BASE_SERIALIZED_UUID;
/**
* This UUID indicates an extension of {@link BASE_SERIALIZED_UUID} for the
* addition of precedence predicates.
*/
private static final UUID ADDED_PRECEDENCE_TRANSITIONS;
/**
* This UUID indicates an extension of {@link #ADDED_PRECEDENCE_TRANSITIONS}
* for the addition of lexer actions encoded as a sequence of
* {@link LexerAction} instances.
*/
private static final UUID ADDED_LEXER_ACTIONS;
/**
* This list contains all of the currently supported UUIDs, ordered by when
* the feature first appeared in this branch.
*/
private static final List<UUID> SUPPORTED_UUIDS;
/**
* This is the current serialized UUID.
*/
public static final UUID SERIALIZED_UUID;
static {
/* WARNING: DO NOT MERGE THESE LINES. If UUIDs differ during a merge,
* resolve the conflict by generating a new ID!
*/
BASE_SERIALIZED_UUID = UUID.fromString("33761B2D-78BB-4A43-8B0B-4F5BEE8AACF3");
ADDED_PRECEDENCE_TRANSITIONS = UUID.fromString("1DA0C57D-6C06-438A-9B27-10BCB3CE0F61");
ADDED_LEXER_ACTIONS = UUID.fromString("AADB8D7E-AEEF-4415-AD2B-8204D6CF042E");
SUPPORTED_UUIDS = new ArrayList<UUID>();
SUPPORTED_UUIDS.add(BASE_SERIALIZED_UUID);
SUPPORTED_UUIDS.add(ADDED_PRECEDENCE_TRANSITIONS);
SUPPORTED_UUIDS.add(ADDED_LEXER_ACTIONS);
SERIALIZED_UUID = ADDED_LEXER_ACTIONS;
}
@NotNull
private final ATNDeserializationOptions deserializationOptions;
public ATNDeserializer() {
this(ATNDeserializationOptions.getDefaultOptions());
}
public ATNDeserializer(@Nullable ATNDeserializationOptions deserializationOptions) {
if (deserializationOptions == null) {
deserializationOptions = ATNDeserializationOptions.getDefaultOptions();
}
this.deserializationOptions = deserializationOptions;
}
/**
* Determines if a particular serialized representation of an ATN supports
* a particular feature, identified by the {@link UUID} used for serializing
* the ATN at the time the feature was first introduced.
*
* @param feature The {@link UUID} marking the first time the feature was
* supported in the serialized ATN.
* @param actualUuid The {@link UUID} of the actual serialized ATN which is
* currently being deserialized.
* @return {@code true} if the {@code actualUuid} value represents a
* serialized ATN at or after the feature identified by {@code feature} was
* introduced; otherwise, {@code false}.
*/
protected boolean isFeatureSupported(UUID feature, UUID actualUuid) {
int featureIndex = SUPPORTED_UUIDS.indexOf(feature);
if (featureIndex < 0) {
return false;
}
return SUPPORTED_UUIDS.indexOf(actualUuid) >= featureIndex;
}
@SuppressWarnings("deprecation")
public ATN deserialize(@NotNull char[] data) {
data = data.clone();
// don't adjust the first value since that's the version number
for (int i = 1; i < data.length; i++) {
data[i] = (char)(data[i] - 2);
}
int p = 0;
int version = toInt(data[p++]);
if (version != SERIALIZED_VERSION) {
String reason = String.format(Locale.getDefault(), "Could not deserialize ATN with version %d (expected %d).", version, SERIALIZED_VERSION);
throw new UnsupportedOperationException(new InvalidClassException(ATN.class.getName(), reason));
}
UUID uuid = toUUID(data, p);
p += 8;
if (!SUPPORTED_UUIDS.contains(uuid)) {
String reason = String.format(Locale.getDefault(), "Could not deserialize ATN with UUID %s (expected %s or a legacy UUID).", uuid, SERIALIZED_UUID);
throw new UnsupportedOperationException(new InvalidClassException(ATN.class.getName(), reason));
}
boolean supportsPrecedencePredicates = isFeatureSupported(ADDED_PRECEDENCE_TRANSITIONS, uuid);
boolean supportsLexerActions = isFeatureSupported(ADDED_LEXER_ACTIONS, uuid);
ATNType grammarType = ATNType.values()[toInt(data[p++])];
int maxTokenType = toInt(data[p++]);
ATN atn = new ATN(grammarType, maxTokenType);
//
// STATES
//
List<Pair<LoopEndState, Integer>> loopBackStateNumbers = new ArrayList<Pair<LoopEndState, Integer>>();
List<Pair<BlockStartState, Integer>> endStateNumbers = new ArrayList<Pair<BlockStartState, Integer>>();
int nstates = toInt(data[p++]);
for (int i=0; i<nstates; i++) {
int stype = toInt(data[p++]);
// ignore bad type of states
if ( stype==ATNState.INVALID_TYPE ) {
atn.addState(null);
continue;
}
int ruleIndex = toInt(data[p++]);
if (ruleIndex == Character.MAX_VALUE) {
ruleIndex = -1;
}
ATNState s = stateFactory(stype, ruleIndex);
if ( stype == ATNState.LOOP_END ) { // special case
int loopBackStateNumber = toInt(data[p++]);
loopBackStateNumbers.add(new Pair<LoopEndState, Integer>((LoopEndState)s, loopBackStateNumber));
}
else if (s instanceof BlockStartState) {
int endStateNumber = toInt(data[p++]);
endStateNumbers.add(new Pair<BlockStartState, Integer>((BlockStartState)s, endStateNumber));
}
atn.addState(s);
}
// delay the assignment of loop back and end states until we know all the state instances have been initialized
for (Pair<LoopEndState, Integer> pair : loopBackStateNumbers) {
pair.a.loopBackState = atn.states.get(pair.b);
}
for (Pair<BlockStartState, Integer> pair : endStateNumbers) {
pair.a.endState = (BlockEndState)atn.states.get(pair.b);
}
int numNonGreedyStates = toInt(data[p++]);
for (int i = 0; i < numNonGreedyStates; i++) {
int stateNumber = toInt(data[p++]);
((DecisionState)atn.states.get(stateNumber)).nonGreedy = true;
}
if (supportsPrecedencePredicates) {
int numPrecedenceStates = toInt(data[p++]);
for (int i = 0; i < numPrecedenceStates; i++) {
int stateNumber = toInt(data[p++]);
((RuleStartState)atn.states.get(stateNumber)).isPrecedenceRule = true;
}
}
//
// RULES
//
int nrules = toInt(data[p++]);
if ( atn.grammarType == ATNType.LEXER ) {
atn.ruleToTokenType = new int[nrules];
}
atn.ruleToStartState = new RuleStartState[nrules];
for (int i=0; i<nrules; i++) {
int s = toInt(data[p++]);
RuleStartState startState = (RuleStartState)atn.states.get(s);
atn.ruleToStartState[i] = startState;
if ( atn.grammarType == ATNType.LEXER ) {
int tokenType = toInt(data[p++]);
if (tokenType == 0xFFFF) {
tokenType = Token.EOF;
}
atn.ruleToTokenType[i] = tokenType;
if (!isFeatureSupported(ADDED_LEXER_ACTIONS, uuid)) {
// this piece of unused metadata was serialized prior to the
// addition of LexerAction
int actionIndexIgnored = toInt(data[p++]);
if (actionIndexIgnored == 0xFFFF) {
actionIndexIgnored = -1;
}
}
}
}
atn.ruleToStopState = new RuleStopState[nrules];
for (ATNState state : atn.states) {
if (!(state instanceof RuleStopState)) {
continue;
}
RuleStopState stopState = (RuleStopState)state;
atn.ruleToStopState[state.ruleIndex] = stopState;
atn.ruleToStartState[state.ruleIndex].stopState = stopState;
}
//
// MODES
//
int nmodes = toInt(data[p++]);
for (int i=0; i<nmodes; i++) {
int s = toInt(data[p++]);
atn.modeToStartState.add((TokensStartState)atn.states.get(s));
}
//
// SETS
//
List<IntervalSet> sets = new ArrayList<IntervalSet>();
int nsets = toInt(data[p++]);
for (int i=0; i<nsets; i++) {
int nintervals = toInt(data[p]);
p++;
IntervalSet set = new IntervalSet();
sets.add(set);
boolean containsEof = toInt(data[p++]) != 0;
if (containsEof) {
set.add(-1);
}
for (int j=0; j<nintervals; j++) {
set.add(toInt(data[p]), toInt(data[p + 1]));
p += 2;
}
}
//
// EDGES
//
int nedges = toInt(data[p++]);
for (int i=0; i<nedges; i++) {
int src = toInt(data[p]);
int trg = toInt(data[p+1]);
int ttype = toInt(data[p+2]);
int arg1 = toInt(data[p+3]);
int arg2 = toInt(data[p+4]);
int arg3 = toInt(data[p+5]);
Transition trans = edgeFactory(atn, ttype, src, trg, arg1, arg2, arg3, sets);
// System.out.println("EDGE "+trans.getClass().getSimpleName()+" "+
// src+"->"+trg+
// " "+Transition.serializationNames[ttype]+
// " "+arg1+","+arg2+","+arg3);
ATNState srcState = atn.states.get(src);
srcState.addTransition(trans);
p += 6;
}
// edges for rule stop states can be derived, so they aren't serialized
for (ATNState state : atn.states) {
for (int i = 0; i < state.getNumberOfTransitions(); i++) {
Transition t = state.transition(i);
if (!(t instanceof RuleTransition)) {
continue;
}
RuleTransition ruleTransition = (RuleTransition)t;
int outermostPrecedenceReturn = -1;
if (atn.ruleToStartState[ruleTransition.target.ruleIndex].isPrecedenceRule) {
if (ruleTransition.precedence == 0) {
outermostPrecedenceReturn = ruleTransition.target.ruleIndex;
}
}
EpsilonTransition returnTransition = new EpsilonTransition(ruleTransition.followState, outermostPrecedenceReturn);
atn.ruleToStopState[ruleTransition.target.ruleIndex].addTransition(returnTransition);
}
}
for (ATNState state : atn.states) {
if (state instanceof BlockStartState) {
// we need to know the end state to set its start state
if (((BlockStartState)state).endState == null) {
throw new IllegalStateException();
}
// block end states can only be associated to a single block start state
if (((BlockStartState)state).endState.startState != null) {
throw new IllegalStateException();
}
((BlockStartState)state).endState.startState = (BlockStartState)state;
}
if (state instanceof PlusLoopbackState) {
PlusLoopbackState loopbackState = (PlusLoopbackState)state;
for (int i = 0; i < loopbackState.getNumberOfTransitions(); i++) {
ATNState target = loopbackState.transition(i).target;
if (target instanceof PlusBlockStartState) {
((PlusBlockStartState)target).loopBackState = loopbackState;
}
}
}
else if (state instanceof StarLoopbackState) {
StarLoopbackState loopbackState = (StarLoopbackState)state;
for (int i = 0; i < loopbackState.getNumberOfTransitions(); i++) {
ATNState target = loopbackState.transition(i).target;
if (target instanceof StarLoopEntryState) {
((StarLoopEntryState)target).loopBackState = loopbackState;
}
}
}
}
//
// DECISIONS
//
int ndecisions = toInt(data[p++]);
for (int i=1; i<=ndecisions; i++) {
int s = toInt(data[p++]);
DecisionState decState = (DecisionState)atn.states.get(s);
atn.decisionToState.add(decState);
decState.decision = i-1;
}
//
// LEXER ACTIONS
//
if (atn.grammarType == ATNType.LEXER) {
if (supportsLexerActions) {
atn.lexerActions = new LexerAction[toInt(data[p++])];
for (int i = 0; i < atn.lexerActions.length; i++) {
LexerActionType actionType = LexerActionType.values()[toInt(data[p++])];
int data1 = toInt(data[p++]);
if (data1 == 0xFFFF) {
data1 = -1;
}
int data2 = toInt(data[p++]);
if (data2 == 0xFFFF) {
data2 = -1;
}
LexerAction lexerAction = lexerActionFactory(actionType, data1, data2);
atn.lexerActions[i] = lexerAction;
}
}
else {
// for compatibility with older serialized ATNs, convert the old
// serialized action index for action transitions to the new
// form, which is the index of a LexerCustomAction
List<LexerAction> legacyLexerActions = new ArrayList<LexerAction>();
for (ATNState state : atn.states) {
for (int i = 0; i < state.getNumberOfTransitions(); i++) {
Transition transition = state.transition(i);
if (!(transition instanceof ActionTransition)) {
continue;
}
int ruleIndex = ((ActionTransition)transition).ruleIndex;
int actionIndex = ((ActionTransition)transition).actionIndex;
LexerCustomAction lexerAction = new LexerCustomAction(ruleIndex, actionIndex);
state.setTransition(i, new ActionTransition(transition.target, ruleIndex, legacyLexerActions.size(), false));
legacyLexerActions.add(lexerAction);
}
}
atn.lexerActions = legacyLexerActions.toArray(new LexerAction[legacyLexerActions.size()]);
}
}
markPrecedenceDecisions(atn);
if (deserializationOptions.isVerifyATN()) {
verifyATN(atn);
}
if (deserializationOptions.isGenerateRuleBypassTransitions() && atn.grammarType == ATNType.PARSER) {
atn.ruleToTokenType = new int[atn.ruleToStartState.length];
for (int i = 0; i < atn.ruleToStartState.length; i++) {
atn.ruleToTokenType[i] = atn.maxTokenType + i + 1;
}
for (int i = 0; i < atn.ruleToStartState.length; i++) {
BasicBlockStartState bypassStart = new BasicBlockStartState();
bypassStart.ruleIndex = i;
atn.addState(bypassStart);
BlockEndState bypassStop = new BlockEndState();
bypassStop.ruleIndex = i;
atn.addState(bypassStop);
bypassStart.endState = bypassStop;
atn.defineDecisionState(bypassStart);
bypassStop.startState = bypassStart;
ATNState endState;
Transition excludeTransition = null;
if (atn.ruleToStartState[i].isPrecedenceRule) {
// wrap from the beginning of the rule to the StarLoopEntryState
endState = null;
for (ATNState state : atn.states) {
if (state.ruleIndex != i) {
continue;
}
if (!(state instanceof StarLoopEntryState)) {
continue;
}
ATNState maybeLoopEndState = state.transition(state.getNumberOfTransitions() - 1).target;
if (!(maybeLoopEndState instanceof LoopEndState)) {
continue;
}
if (maybeLoopEndState.epsilonOnlyTransitions && maybeLoopEndState.transition(0).target instanceof RuleStopState) {
endState = state;
break;
}
}
if (endState == null) {
throw new UnsupportedOperationException("Couldn't identify final state of the precedence rule prefix section.");
}
excludeTransition = ((StarLoopEntryState)endState).loopBackState.transition(0);
}
else {
endState = atn.ruleToStopState[i];
}
// all non-excluded transitions that currently target end state need to target blockEnd instead
for (ATNState state : atn.states) {
for (Transition transition : state.transitions) {
if (transition == excludeTransition) {
continue;
}
if (transition.target == endState) {
transition.target = bypassStop;
}
}
}
// all transitions leaving the rule start state need to leave blockStart instead
while (atn.ruleToStartState[i].getNumberOfTransitions() > 0) {
Transition transition = atn.ruleToStartState[i].removeTransition(atn.ruleToStartState[i].getNumberOfTransitions() - 1);
bypassStart.addTransition(transition);
}
// link the new states
atn.ruleToStartState[i].addTransition(new EpsilonTransition(bypassStart));
bypassStop.addTransition(new EpsilonTransition(endState));
ATNState matchState = new BasicState();
atn.addState(matchState);
matchState.addTransition(new AtomTransition(bypassStop, atn.ruleToTokenType[i]));
bypassStart.addTransition(new EpsilonTransition(matchState));
}
if (deserializationOptions.isVerifyATN()) {
// reverify after modification
verifyATN(atn);
}
}
return atn;
}
/**
* Analyze the {@link StarLoopEntryState} states in the specified ATN to set
* the {@link StarLoopEntryState#precedenceRuleDecision} field to the
* correct value.
*
* @param atn The ATN.
*/
protected void markPrecedenceDecisions(@NotNull ATN atn) {
for (ATNState state : atn.states) {
if (!(state instanceof StarLoopEntryState)) {
continue;
}
/* We analyze the ATN to determine if this ATN decision state is the
* decision for the closure block that determines whether a
* precedence rule should continue or complete.
*/
if (atn.ruleToStartState[state.ruleIndex].isPrecedenceRule) {
ATNState maybeLoopEndState = state.transition(state.getNumberOfTransitions() - 1).target;
if (maybeLoopEndState instanceof LoopEndState) {
if (maybeLoopEndState.epsilonOnlyTransitions && maybeLoopEndState.transition(0).target instanceof RuleStopState) {
((StarLoopEntryState)state).precedenceRuleDecision = true;
}
}
}
}
}
protected void verifyATN(ATN atn) {
// verify assumptions
for (ATNState state : atn.states) {
if (state == null) {
continue;
}
checkCondition(state.onlyHasEpsilonTransitions() || state.getNumberOfTransitions() <= 1);
if (state instanceof PlusBlockStartState) {
checkCondition(((PlusBlockStartState)state).loopBackState != null);
}
if (state instanceof StarLoopEntryState) {
StarLoopEntryState starLoopEntryState = (StarLoopEntryState)state;
checkCondition(starLoopEntryState.loopBackState != null);
checkCondition(starLoopEntryState.getNumberOfTransitions() == 2);
if (starLoopEntryState.transition(0).target instanceof StarBlockStartState) {
checkCondition(starLoopEntryState.transition(1).target instanceof LoopEndState);
checkCondition(!starLoopEntryState.nonGreedy);
}
else if (starLoopEntryState.transition(0).target instanceof LoopEndState) {
checkCondition(starLoopEntryState.transition(1).target instanceof StarBlockStartState);
checkCondition(starLoopEntryState.nonGreedy);
}
else {
throw new IllegalStateException();
}
}
if (state instanceof StarLoopbackState) {
checkCondition(state.getNumberOfTransitions() == 1);
checkCondition(state.transition(0).target instanceof StarLoopEntryState);
}
if (state instanceof LoopEndState) {
checkCondition(((LoopEndState)state).loopBackState != null);
}
if (state instanceof RuleStartState) {
checkCondition(((RuleStartState)state).stopState != null);
}
if (state instanceof BlockStartState) {
checkCondition(((BlockStartState)state).endState != null);
}
if (state instanceof BlockEndState) {
checkCondition(((BlockEndState)state).startState != null);
}
if (state instanceof DecisionState) {
DecisionState decisionState = (DecisionState)state;
checkCondition(decisionState.getNumberOfTransitions() <= 1 || decisionState.decision >= 0);
}
else {
checkCondition(state.getNumberOfTransitions() <= 1 || state instanceof RuleStopState);
}
}
}
protected void checkCondition(boolean condition) {
checkCondition(condition, null);
}
protected void checkCondition(boolean condition, String message) {
if (!condition) {
throw new IllegalStateException(message);
}
}
protected static int toInt(char c) {
return c;
}
protected static int toInt32(char[] data, int offset) {
return (int)data[offset] | ((int)data[offset + 1] << 16);
}
protected static long toLong(char[] data, int offset) {
long lowOrder = toInt32(data, offset) & 0x00000000FFFFFFFFL;
return lowOrder | ((long)toInt32(data, offset + 2) << 32);
}
protected static UUID toUUID(char[] data, int offset) {
long leastSigBits = toLong(data, offset);
long mostSigBits = toLong(data, offset + 4);
return new UUID(mostSigBits, leastSigBits);
}
@NotNull
protected Transition edgeFactory(@NotNull ATN atn,
int type, int src, int trg,
int arg1, int arg2, int arg3,
List<IntervalSet> sets)
{
ATNState target = atn.states.get(trg);
switch (type) {
case Transition.EPSILON : return new EpsilonTransition(target);
case Transition.RANGE :
if (arg3 != 0) {
return new RangeTransition(target, Token.EOF, arg2);
}
else {
return new RangeTransition(target, arg1, arg2);
}
case Transition.RULE :
RuleTransition rt = new RuleTransition((RuleStartState)atn.states.get(arg1), arg2, arg3, target);
return rt;
case Transition.PREDICATE :
PredicateTransition pt = new PredicateTransition(target, arg1, arg2, arg3 != 0);
return pt;
case Transition.PRECEDENCE:
return new PrecedencePredicateTransition(target, arg1);
case Transition.ATOM :
if (arg3 != 0) {
return new AtomTransition(target, Token.EOF);
}
else {
return new AtomTransition(target, arg1);
}
case Transition.ACTION :
ActionTransition a = new ActionTransition(target, arg1, arg2, arg3 != 0);
return a;
case Transition.SET : return new SetTransition(target, sets.get(arg1));
case Transition.NOT_SET : return new NotSetTransition(target, sets.get(arg1));
case Transition.WILDCARD : return new WildcardTransition(target);
}
throw new IllegalArgumentException("The specified transition type is not valid.");
}
protected ATNState stateFactory(int type, int ruleIndex) {
ATNState s;
switch (type) {
case ATNState.INVALID_TYPE: return null;
case ATNState.BASIC : s = new BasicState(); break;
case ATNState.RULE_START : s = new RuleStartState(); break;
case ATNState.BLOCK_START : s = new BasicBlockStartState(); break;
case ATNState.PLUS_BLOCK_START : s = new PlusBlockStartState(); break;
case ATNState.STAR_BLOCK_START : s = new StarBlockStartState(); break;
case ATNState.TOKEN_START : s = new TokensStartState(); break;
case ATNState.RULE_STOP : s = new RuleStopState(); break;
case ATNState.BLOCK_END : s = new BlockEndState(); break;
case ATNState.STAR_LOOP_BACK : s = new StarLoopbackState(); break;
case ATNState.STAR_LOOP_ENTRY : s = new StarLoopEntryState(); break;
case ATNState.PLUS_LOOP_BACK : s = new PlusLoopbackState(); break;
case ATNState.LOOP_END : s = new LoopEndState(); break;
default :
String message = String.format(Locale.getDefault(), "The specified state type %d is not valid.", type);
throw new IllegalArgumentException(message);
}
s.ruleIndex = ruleIndex;
return s;
}
protected LexerAction lexerActionFactory(LexerActionType type, int data1, int data2) {
switch (type) {
case CHANNEL:
return new LexerChannelAction(data1);
case CUSTOM:
return new LexerCustomAction(data1, data2);
case MODE:
return new LexerModeAction(data1);
case MORE:
return LexerMoreAction.INSTANCE;
case POP_MODE:
return LexerPopModeAction.INSTANCE;
case PUSH_MODE:
return new LexerPushModeAction(data1);
case SKIP:
return LexerSkipAction.INSTANCE;
case TYPE:
return new LexerTypeAction(data1);
default:
String message = String.format(Locale.getDefault(), "The specified lexer action type %d is not valid.", type);
throw new IllegalArgumentException(message);
}
}
}