parser.cpp

#include "parser.hh"
#include "token.hh"

// Parser constructor that save all token recognizer in a vector.
Parser::Parser(std::string filename) {
  file.open(filename);
  if (!file)
    throw (std::string("Bad file"));

  token_tab.push_back(std::make_unique<SpaceChecker>());
  token_tab.push_back(std::make_unique<IntChecker>());
  token_tab.push_back(std::make_unique<CharChecker>());
  token_tab.push_back(std::make_unique<SintChecker>());
  token_tab.push_back(std::make_unique<IfChecker>());
  token_tab.push_back(std::make_unique<ElseChecker>());
  token_tab.push_back(std::make_unique<WhileChecker>());
  token_tab.push_back(std::make_unique<ReturnChecker>());
  token_tab.push_back(std::make_unique<IdChecker>());
  token_tab.push_back(std::make_unique<LstrChecker>());
  token_tab.push_back(std::make_unique<OperatorChecker>());
  token_tab.push_back(std::make_unique<ComparatorChecker>());
  token_tab.push_back(std::make_unique<ParenChecker>());
  token_tab.push_back(std::make_unique<BracketChecker>());
  token_tab.push_back(std::make_unique<EqualChecker>());
  token_tab.push_back(std::make_unique<SemiChecker>());
  token_tab.push_back(std::make_unique<CommaChecker>());
}

// Simple function to output all the tokens saved.
void Parser::PrintResult(void) {
  for (auto &i : result) {
    i.Print();
    if (i.typePrint == "SEMICO")
      std::cout << std::endl;
  }
}

// This parse function will take one line at a time from a file.
// Then try every token recognition function on this line.
// When a token recognizer found a token, it will erase it from the line.
// It continue until no line is left.
// In a line if no token is recognized, a exception is throw.
void Parser::ParseFile(void) {
  std::string line;
  int countLine = 0;
  bool changed = true;
  std::string savedLine;

  while (std::getline(file, line)) {
    savedLine = line;
    while (changed == true && line.length() != 0) {
      changed = false;
      for (auto &i: token_tab) {
	Token tmp = i->CheckToken(line);
	if (tmp.value != "") {
	  result.push_back(tmp);
	  changed = true;
	}
	if (line.length() == 0)
	  break;
      }
    }
    if (line.length() != 0)
      throw "Lexical error at line " + std::to_string(countLine) + "\n\t" + savedLine;
    countLine++;
  }
};