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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 "dfa/DFA.h"
#include "Vocabulary.h"
#include "dfa/DFASerializer.h"
using namespace antlr4::dfa;
DFASerializer::DFASerializer(const DFA *dfa, const Vocabulary &vocabulary) : _dfa(dfa), _vocabulary(vocabulary) {
}
std::string DFASerializer::toString() const {
if (_dfa->s0 == nullptr) {
return "";
}
std::stringstream ss;
std::vector<DFAState *> states = _dfa->getStates();
for (auto *s : states) {
for (size_t i = 0; i < s->edges.size(); i++) {
DFAState *t = s->edges[i];
if (t != nullptr && t->stateNumber != INT32_MAX) {
ss << getStateString(s);
std::string label = getEdgeLabel(i);
ss << "-" << label << "->" << getStateString(t) << "\n";
}
}
}
return ss.str();
}
std::string DFASerializer::getEdgeLabel(size_t i) const {
return _vocabulary.getDisplayName(i); // ml: no longer needed -1 as we use a map for edges, without offset.
}
std::string DFASerializer::getStateString(DFAState *s) const {
size_t n = s->stateNumber;
const std::string baseStateStr = std::string(s->isAcceptState ? ":" : "") + "s" + std::to_string(n) +
(s->requiresFullContext ? "^" : "");
if (s->isAcceptState) {
if (!s->predicates.empty()) {
std::string buf;
for (size_t i = 0; i < s->predicates.size(); i++) {
buf.append(s->predicates[i].toString());
}
return baseStateStr + "=>" + buf;
} else {
return baseStateStr + "=>" + std::to_string(s->prediction);
}
} else {
return baseStateStr;
}
}
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