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ATNSerializer.cpp
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ATNSerializer.cpp
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/* Copyright (c) 2012-2017 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.
*/
#include "misc/IntervalSet.h"
#include "atn/ATNType.h"
#include "atn/ATNState.h"
#include "atn/BlockEndState.h"
#include "atn/DecisionState.h"
#include "atn/RuleStartState.h"
#include "atn/LoopEndState.h"
#include "atn/BlockStartState.h"
#include "atn/Transition.h"
#include "atn/SetTransition.h"
#include "Token.h"
#include "misc/Interval.h"
#include "atn/ATN.h"
#include "atn/RuleTransition.h"
#include "atn/PrecedencePredicateTransition.h"
#include "atn/PredicateTransition.h"
#include "atn/RangeTransition.h"
#include "atn/AtomTransition.h"
#include "atn/ActionTransition.h"
#include "atn/ATNDeserializer.h"
#include "atn/TokensStartState.h"
#include "Exceptions.h"
#include "support/CPPUtils.h"
#include "atn/LexerChannelAction.h"
#include "atn/LexerCustomAction.h"
#include "atn/LexerModeAction.h"
#include "atn/LexerPushModeAction.h"
#include "atn/LexerTypeAction.h"
#include "Exceptions.h"
#include "atn/ATNSerializer.h"
using namespace antlrcpp;
using namespace antlr4::atn;
ATNSerializer::ATNSerializer(ATN *atn) { this->atn = atn; }
ATNSerializer::ATNSerializer(ATN *atn, const std::vector<std::string> &tokenNames) {
this->atn = atn;
_tokenNames = tokenNames;
}
ATNSerializer::~ATNSerializer() { }
std::vector<size_t> ATNSerializer::serialize() {
std::vector<size_t> data;
data.push_back(ATNDeserializer::SERIALIZED_VERSION);
serializeUUID(data, ATNDeserializer::SERIALIZED_UUID());
// convert grammar type to ATN const to avoid dependence on ANTLRParser
data.push_back(static_cast<size_t>(atn->grammarType));
data.push_back(atn->maxTokenType);
size_t nedges = 0;
std::unordered_map<misc::IntervalSet, int> setIndices;
std::vector<misc::IntervalSet> sets;
// dump states, count edges and collect sets while doing so
std::vector<size_t> nonGreedyStates;
std::vector<size_t> precedenceStates;
data.push_back(atn->states.size());
for (ATNState *s : atn->states) {
if (s == nullptr) { // might be optimized away
data.push_back(ATNState::ATN_INVALID_TYPE);
continue;
}
size_t stateType = s->getStateType();
if (is<DecisionState *>(s) && (static_cast<DecisionState *>(s))->nonGreedy) {
nonGreedyStates.push_back(s->stateNumber);
}
if (is<RuleStartState *>(s) && (static_cast<RuleStartState *>(s))->isLeftRecursiveRule) {
precedenceStates.push_back(s->stateNumber);
}
data.push_back(stateType);
if (s->ruleIndex == INVALID_INDEX) {
data.push_back(0xFFFF);
}
else {
data.push_back(s->ruleIndex);
}
if (s->getStateType() == ATNState::LOOP_END) {
data.push_back((static_cast<LoopEndState *>(s))->loopBackState->stateNumber);
}
else if (is<BlockStartState *>(s)) {
data.push_back((static_cast<BlockStartState *>(s))->endState->stateNumber);
}
if (s->getStateType() != ATNState::RULE_STOP) {
// the deserializer can trivially derive these edges, so there's no need
// to serialize them
nedges += s->transitions.size();
}
for (size_t i = 0; i < s->transitions.size(); i++) {
Transition *t = s->transitions[i];
Transition::SerializationType edgeType = t->getSerializationType();
if (edgeType == Transition::SET || edgeType == Transition::NOT_SET) {
SetTransition *st = static_cast<SetTransition *>(t);
if (setIndices.find(st->set) == setIndices.end()) {
sets.push_back(st->set);
setIndices.insert({ st->set, (int)sets.size() - 1 });
}
}
}
}
// non-greedy states
data.push_back(nonGreedyStates.size());
for (size_t i = 0; i < nonGreedyStates.size(); i++) {
data.push_back(nonGreedyStates.at(i));
}
// precedence states
data.push_back(precedenceStates.size());
for (size_t i = 0; i < precedenceStates.size(); i++) {
data.push_back(precedenceStates.at(i));
}
size_t nrules = atn->ruleToStartState.size();
data.push_back(nrules);
for (size_t r = 0; r < nrules; r++) {
ATNState *ruleStartState = atn->ruleToStartState[r];
data.push_back(ruleStartState->stateNumber);
if (atn->grammarType == ATNType::LEXER) {
if (atn->ruleToTokenType[r] == Token::EOF) {
data.push_back(0xFFFF);
}
else {
data.push_back(atn->ruleToTokenType[r]);
}
}
}
size_t nmodes = atn->modeToStartState.size();
data.push_back(nmodes);
if (nmodes > 0) {
for (const auto &modeStartState : atn->modeToStartState) {
data.push_back(modeStartState->stateNumber);
}
}
size_t nsets = sets.size();
data.push_back(nsets);
for (auto set : sets) {
bool containsEof = set.contains(Token::EOF);
if (containsEof && set.getIntervals().at(0).b == -1) {
data.push_back(set.getIntervals().size() - 1);
}
else {
data.push_back(set.getIntervals().size());
}
data.push_back(containsEof ? 1 : 0);
for (auto &interval : set.getIntervals()) {
if (interval.a == -1) {
if (interval.b == -1) {
continue;
} else {
data.push_back(0);
}
}
else {
data.push_back(interval.a);
}
data.push_back(interval.b);
}
}
data.push_back(nedges);
for (ATNState *s : atn->states) {
if (s == nullptr) {
// might be optimized away
continue;
}
if (s->getStateType() == ATNState::RULE_STOP) {
continue;
}
for (size_t i = 0; i < s->transitions.size(); i++) {
Transition *t = s->transitions[i];
if (atn->states[t->target->stateNumber] == nullptr) {
throw IllegalStateException("Cannot serialize a transition to a removed state.");
}
size_t src = s->stateNumber;
size_t trg = t->target->stateNumber;
Transition::SerializationType edgeType = t->getSerializationType();
size_t arg1 = 0;
size_t arg2 = 0;
size_t arg3 = 0;
switch (edgeType) {
case Transition::RULE:
trg = (static_cast<RuleTransition *>(t))->followState->stateNumber;
arg1 = (static_cast<RuleTransition *>(t))->target->stateNumber;
arg2 = (static_cast<RuleTransition *>(t))->ruleIndex;
arg3 = (static_cast<RuleTransition *>(t))->precedence;
break;
case Transition::PRECEDENCE:
{
PrecedencePredicateTransition *ppt =
static_cast<PrecedencePredicateTransition *>(t);
arg1 = ppt->precedence;
}
break;
case Transition::PREDICATE:
{
PredicateTransition *pt = static_cast<PredicateTransition *>(t);
arg1 = pt->ruleIndex;
arg2 = pt->predIndex;
arg3 = pt->isCtxDependent ? 1 : 0;
}
break;
case Transition::RANGE:
arg1 = (static_cast<RangeTransition *>(t))->from;
arg2 = (static_cast<RangeTransition *>(t))->to;
if (arg1 == Token::EOF) {
arg1 = 0;
arg3 = 1;
}
break;
case Transition::ATOM:
arg1 = (static_cast<AtomTransition *>(t))->_label;
if (arg1 == Token::EOF) {
arg1 = 0;
arg3 = 1;
}
break;
case Transition::ACTION:
{
ActionTransition *at = static_cast<ActionTransition *>(t);
arg1 = at->ruleIndex;
arg2 = at->actionIndex;
if (arg2 == INVALID_INDEX) {
arg2 = 0xFFFF;
}
arg3 = at->isCtxDependent ? 1 : 0;
}
break;
case Transition::SET:
arg1 = setIndices[(static_cast<SetTransition *>(t))->set];
break;
case Transition::NOT_SET:
arg1 = setIndices[(static_cast<SetTransition *>(t))->set];
break;
default:
break;
}
data.push_back(src);
data.push_back(trg);
data.push_back(edgeType);
data.push_back(arg1);
data.push_back(arg2);
data.push_back(arg3);
}
}
size_t ndecisions = atn->decisionToState.size();
data.push_back(ndecisions);
for (DecisionState *decStartState : atn->decisionToState) {
data.push_back(decStartState->stateNumber);
}
// LEXER ACTIONS
if (atn->grammarType == ATNType::LEXER) {
data.push_back(atn->lexerActions.size());
for (Ref<LexerAction> &action : atn->lexerActions) {
data.push_back(static_cast<size_t>(action->getActionType()));
switch (action->getActionType()) {
case LexerActionType::CHANNEL:
{
int channel = std::dynamic_pointer_cast<LexerChannelAction>(action)->getChannel();
data.push_back(channel != -1 ? channel : 0xFFFF);
data.push_back(0);
break;
}
case LexerActionType::CUSTOM:
{
size_t ruleIndex = std::dynamic_pointer_cast<LexerCustomAction>(action)->getRuleIndex();
size_t actionIndex = std::dynamic_pointer_cast<LexerCustomAction>(action)->getActionIndex();
data.push_back(ruleIndex != INVALID_INDEX ? ruleIndex : 0xFFFF);
data.push_back(actionIndex != INVALID_INDEX ? actionIndex : 0xFFFF);
break;
}
case LexerActionType::MODE:
{
int mode = std::dynamic_pointer_cast<LexerModeAction>(action)->getMode();
data.push_back(mode != -1 ? mode : 0xFFFF);
data.push_back(0);
break;
}
case LexerActionType::MORE:
data.push_back(0);
data.push_back(0);
break;
case LexerActionType::POP_MODE:
data.push_back(0);
data.push_back(0);
break;
case LexerActionType::PUSH_MODE:
{
int mode = std::dynamic_pointer_cast<LexerPushModeAction>(action)->getMode();
data.push_back(mode != -1 ? mode : 0xFFFF);
data.push_back(0);
break;
}
case LexerActionType::SKIP:
data.push_back(0);
data.push_back(0);
break;
case LexerActionType::TYPE:
{
int type = std::dynamic_pointer_cast<LexerTypeAction>(action)->getType();
data.push_back(type != -1 ? type : 0xFFFF);
data.push_back(0);
break;
}
default:
throw IllegalArgumentException("The specified lexer action type " +
std::to_string(static_cast<size_t>(action->getActionType())) +
" is not valid.");
}
}
}
// don't adjust the first value since that's the version number
for (size_t i = 1; i < data.size(); i++) {
if (data.at(i) > 0xFFFF) {
throw UnsupportedOperationException("Serialized ATN data element out of range.");
}
size_t value = (data.at(i) + 2) & 0xFFFF;
data.at(i) = value;
}
return data;
}
//------------------------------------------------------------------------------------------------------------
std::string ATNSerializer::decode(const std::wstring &inpdata) {
if (inpdata.size() < 10)
throw IllegalArgumentException("Not enough data to decode");
std::vector<uint16_t> data(inpdata.size());
data[0] = (uint16_t)inpdata[0];
// Don't adjust the first value since that's the version number.
for (size_t i = 1; i < inpdata.size(); ++i) {
data[i] = (uint16_t)inpdata[i] - 2;
}
std::string buf;
size_t p = 0;
size_t version = data[p++];
if (version != ATNDeserializer::SERIALIZED_VERSION) {
std::string reason = "Could not deserialize ATN with version " + std::to_string(version) + "(expected " +
std::to_string(ATNDeserializer::SERIALIZED_VERSION) + ").";
throw UnsupportedOperationException("ATN Serializer" + reason);
}
Guid uuid = ATNDeserializer::toUUID(data.data(), p);
p += 8;
if (uuid != ATNDeserializer::SERIALIZED_UUID()) {
std::string reason = "Could not deserialize ATN with UUID " + uuid.toString() + " (expected " +
ATNDeserializer::SERIALIZED_UUID().toString() + ").";
throw UnsupportedOperationException("ATN Serializer" + reason);
}
p++; // skip grammarType
size_t maxType = data[p++];
buf.append("max type ").append(std::to_string(maxType)).append("\n");
size_t nstates = data[p++];
for (size_t i = 0; i < nstates; i++) {
size_t stype = data[p++];
if (stype == ATNState::ATN_INVALID_TYPE) { // ignore bad type of states
continue;
}
size_t ruleIndex = data[p++];
if (ruleIndex == 0xFFFF) {
ruleIndex = INVALID_INDEX;
}
std::string arg = "";
if (stype == ATNState::LOOP_END) {
int loopBackStateNumber = data[p++];
arg = std::string(" ") + std::to_string(loopBackStateNumber);
}
else if (stype == ATNState::PLUS_BLOCK_START ||
stype == ATNState::STAR_BLOCK_START ||
stype == ATNState::BLOCK_START) {
int endStateNumber = data[p++];
arg = std::string(" ") + std::to_string(endStateNumber);
}
buf.append(std::to_string(i))
.append(":")
.append(ATNState::serializationNames[stype])
.append(" ")
.append(std::to_string(ruleIndex))
.append(arg)
.append("\n");
}
size_t numNonGreedyStates = data[p++];
p += numNonGreedyStates; // Instead of that useless loop below.
/*
for (int i = 0; i < numNonGreedyStates; i++) {
int stateNumber = data[p++];
}
*/
size_t numPrecedenceStates = data[p++];
p += numPrecedenceStates;
/*
for (int i = 0; i < numPrecedenceStates; i++) {
int stateNumber = data[p++];
}
*/
size_t nrules = data[p++];
for (size_t i = 0; i < nrules; i++) {
size_t s = data[p++];
if (atn->grammarType == ATNType::LEXER) {
size_t arg1 = data[p++];
buf.append("rule ")
.append(std::to_string(i))
.append(":")
.append(std::to_string(s))
.append(" ")
.append(std::to_string(arg1))
.append("\n");
}
else {
buf.append("rule ")
.append(std::to_string(i))
.append(":")
.append(std::to_string(s))
.append("\n");
}
}
size_t nmodes = data[p++];
for (size_t i = 0; i < nmodes; i++) {
size_t s = data[p++];
buf.append("mode ")
.append(std::to_string(i))
.append(":")
.append(std::to_string(s))
.append("\n");
}
size_t nsets = data[p++];
for (size_t i = 0; i < nsets; i++) {
size_t nintervals = data[p++];
buf.append(std::to_string(i)).append(":");
bool containsEof = data[p++] != 0;
if (containsEof) {
buf.append(getTokenName(Token::EOF));
}
for (size_t j = 0; j < nintervals; j++) {
if (containsEof || j > 0) {
buf.append(", ");
}
buf.append(getTokenName(data[p]))
.append("..")
.append(getTokenName(data[p + 1]));
p += 2;
}
buf.append("\n");
}
size_t nedges = data[p++];
for (size_t i = 0; i < nedges; i++) {
size_t src = data[p];
size_t trg = data[p + 1];
size_t ttype = data[p + 2];
size_t arg1 = data[p + 3];
size_t arg2 = data[p + 4];
size_t arg3 = data[p + 5];
buf.append(std::to_string(src))
.append("->")
.append(std::to_string(trg))
.append(" ")
.append(Transition::serializationNames[ttype])
.append(" ")
.append(std::to_string(arg1))
.append(",")
.append(std::to_string(arg2))
.append(",")
.append(std::to_string(arg3))
.append("\n");
p += 6;
}
size_t ndecisions = data[p++];
for (size_t i = 0; i < ndecisions; i++) {
size_t s = data[p++];
buf += std::to_string(i) + ":" + std::to_string(s) + "\n";
}
if (atn->grammarType == ATNType::LEXER) {
//int lexerActionCount = data[p++];
//p += lexerActionCount * 3; // Instead of useless loop below.
/*
for (int i = 0; i < lexerActionCount; i++) {
LexerActionType actionType = (LexerActionType)data[p++];
int data1 = data[p++];
int data2 = data[p++];
}
*/
}
return buf;
}
std::string ATNSerializer::getTokenName(size_t t) {
if (t == Token::EOF) {
return "EOF";
}
if (atn->grammarType == ATNType::LEXER && t <= 0x10FFFF) {
switch (t) {
case '\n':
return "'\\n'";
case '\r':
return "'\\r'";
case '\t':
return "'\\t'";
case '\b':
return "'\\b'";
case '\f':
return "'\\f'";
case '\\':
return "'\\\\'";
case '\'':
return "'\\''";
default:
std::string s_hex = antlrcpp::toHexString((int)t);
if (s_hex >= "0" && s_hex <= "7F" && !iscntrl((int)t)) {
return "'" + std::to_string(t) + "'";
}
// turn on the bit above max "\u10FFFF" value so that we pad with zeros
// then only take last 6 digits
std::string hex = antlrcpp::toHexString((int)t | 0x1000000).substr(1, 6);
std::string unicodeStr = std::string("'\\u") + hex + std::string("'");
return unicodeStr;
}
}
if (_tokenNames.size() > 0 && t < _tokenNames.size()) {
return _tokenNames[t];
}
return std::to_string(t);
}
std::wstring ATNSerializer::getSerializedAsString(ATN *atn) {
std::vector<size_t> data = getSerialized(atn);
std::wstring result;
for (size_t entry : data)
result.push_back((wchar_t)entry);
return result;
}
std::vector<size_t> ATNSerializer::getSerialized(ATN *atn) {
return ATNSerializer(atn).serialize();
}
std::string ATNSerializer::getDecoded(ATN *atn, std::vector<std::string> &tokenNames) {
std::wstring serialized = getSerializedAsString(atn);
return ATNSerializer(atn, tokenNames).decode(serialized);
}
void ATNSerializer::serializeUUID(std::vector<size_t> &data, Guid uuid) {
unsigned int twoBytes = 0;
bool firstByte = true;
for( std::vector<unsigned char>::const_reverse_iterator rit = uuid.rbegin(); rit != uuid.rend(); ++rit )
{
if (firstByte) {
twoBytes = *rit;
firstByte = false;
} else {
twoBytes |= (*rit << 8);
data.push_back(twoBytes);
firstByte = true;
}
}
if (!firstByte)
throw IllegalArgumentException( "The UUID provided is not valid (odd number of bytes)." );
}