text: ﻿/* 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 std::vector<std::string>& tokenNames)
    : DFASerializer(dfa, Vocabulary::fromTokenNames(tokenNames)) {
  }
  
  DFASerializer::DFASerializer(const DFA *dfa, const Vocabulary &vocabulary) : _dfa(dfa), _vocabulary(vocabulary) {
  }
  
  DFASerializer::~DFASerializer() {
  }
  
  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;
    }
  }
  