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main.cpp
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main.cpp
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#include <iostream>
#include <fstream>
#include <sstream>
#include <regex>
#include <set>
#include "token.hpp"
using namespace std;
const static string inputFilePath = "D:\\testFragment.cpp";
// Определение регулярных выражений
/*
R - отключает ескейп последовательности. \n? - отступ строки 0 ил и1 раз.
//.* - однострочные комментарии | - или многострочные комментарии (* нужно экранировать т.к. служебный символ)
*/
const static regex commentsRegEx(R"(\n?//.*|/\*[\W\w]*?\*/)");
const static regex spacesRegEx(R"([ \t]*(\W)[ \t]*)");
const static regex tokensRegEx(R"(<=|>=|==|!=|[(){};=+\-*/<>=!,]|[^ \n\t(){};=+\-*/<>=!,]+)");
//const static regex numberRegEx(R"(^[0-9]+$)");
const static regex numberRegEx(R"(^[0-9]+|[0-9]+.[0-9]*$)");
const static regex idRegEx(R"(^[a-zA-Z_][a-zA-Z0-9_]*$)");
// Определение прототипов функций
string normalizeProgramCode(string program);
tuple<vector<token>, set<token>, vector<token>> tokenizeProgram(const string &);
string syntaxAnalyzer(const vector<token> &tokens);
bool recognizeExpectedToken(const vector<token> &tokens, size_t index, const tokenType &expected_type);
string getErrorMessage(const vector<token> &, size_t, string);
pair<string, size_t> rule_s(const vector<token> &, size_t);
pair<string, size_t> rule_h(const vector<token> &, size_t);
pair<string, size_t> rule_i(const vector<token> &, size_t);
pair<string, size_t> rule_n(const vector<token> &, size_t);
pair<string, size_t> rule_m(const vector<token> &, size_t);
pair<string, size_t> subrule_m_1(const vector<token> &, size_t);
pair<string, size_t> subrule_m_2(const vector<token> &, size_t);
pair<string, size_t> subrule_m_3(const vector<token> &, size_t);
pair<string, size_t> subrule_m_4(const vector<token> &, size_t);
pair<string, size_t> subrule_m_5(const vector<token> &, size_t);
pair<string, size_t> subrule_m_6(const vector<token> &, size_t);
pair<string, size_t> subrule_m_7(const vector<token> &, size_t);
pair<string, size_t> subrule_m_8(const vector<token> &, size_t);
pair<string, size_t> rule_a(const vector<token> &, size_t);
pair<string, size_t> subrule_a_1(const vector<token> &, size_t);
pair<string, size_t> subrule_a_2(const vector<token> &, size_t);
pair<string, size_t> subrule_a_3(const vector<token> &, size_t);
pair<string, size_t> rule_o(const vector<token> &, size_t);
pair<string, size_t> subrule_o_1(const vector<token> &, size_t);
pair<string, size_t> subrule_o_2(const vector<token> &, size_t);
pair<string, size_t> subrule_o_3(const vector<token> &, size_t);
pair<string, size_t> rule_d(const vector<token> &, size_t);
pair<string, size_t> rule_q(const vector<token> &, size_t);
pair<string, size_t> rule_b(const vector<token> &, size_t);
pair<string, size_t> rule_f(const vector<token> &, size_t);
pair<string, size_t> subrule_f_1(const vector<token> &, size_t);
pair<string, size_t> subrule_f_2(const vector<token> &, size_t);
// Реализация прототипов функций
string normalizeProgramCode(string program)
{
stringstream result;
if (regex_search(program, commentsRegEx))
{
smatch smatchComments;
while (regex_search(program, smatchComments, commentsRegEx))
{
result << smatchComments.prefix(); // Все начало строки, до первого сопоставления регулярки
program = smatchComments.suffix(); // Оставшаяся часть строки, которую regex_search еще не проверил
}
}
result << program; // Дописываем остольную часть строки, в которой regex_search ничего не находит
program = result.str();
result.clear();
if (regex_search(program, spacesRegEx))
{
program = regex_replace(program, spacesRegEx,
"$1"); // $n - ссылка на n-ую скобочную группу. Т.е. здесь меняем на (\W) если она есть
}
return program;
}
tuple<vector<token>, set<token>, vector<token>> tokenizeProgram(const string &program)
{
vector<string> lexemes;
sregex_iterator sregex_iterator(program.begin(), program.end(), tokensRegEx);
for (auto it = sregex_iterator, sregex_iterator_end = std::sregex_iterator(); it != sregex_iterator_end; it++)
{
lexemes.emplace_back(it->str());
}
map<string, token> tokens_instances;
tokens_instances.emplace("+", token(tokenType::plus, "+"));
tokens_instances.emplace("-", token(tokenType::minus, "-"));
tokens_instances.emplace("*", token(tokenType::multiply, "*"));
tokens_instances.emplace("/", token(tokenType::divide, "/"));
tokens_instances.emplace("=", token(tokenType::assignment, "="));
tokens_instances.emplace("==", token(tokenType::equal, "=="));
tokens_instances.emplace("!=", token(tokenType::not_equal, "!="));
tokens_instances.emplace(">", token(tokenType::greater, ">"));
tokens_instances.emplace("<", token(tokenType::less, "<"));
tokens_instances.emplace(">=", token(tokenType::greater_or_equal, ">="));
tokens_instances.emplace("<=", token(tokenType::less_or_equal, "<="));
tokens_instances.emplace(";", token(tokenType::semicolon, ";"));
tokens_instances.emplace("(", token(tokenType::bracket_left, "("));
tokens_instances.emplace(")", token(tokenType::bracket_right, ")"));
tokens_instances.emplace("{", token(tokenType::bracket_curly_left, "{"));
tokens_instances.emplace("}", token(tokenType::bracket_curly_right, "}"));
tokens_instances.emplace("if", token(tokenType::if_, "if"));
tokens_instances.emplace("else", token(tokenType::else_, "else"));
tokens_instances.emplace("while", token(tokenType::while_, "while"));
tokens_instances.emplace("for", token(tokenType::for_, "for"));
tokens_instances.emplace("do", token(tokenType::do_, "do"));
tokens_instances.emplace("return", token(tokenType::return_, "return"));
tokens_instances.emplace(",", token(tokenType::comma, ","));
set<string> tokens_datatypes{"bool",
"signed char", "unsigned char", "char",
"signed short", "unsigned short", "short",
"signed int", "unsigned int", "int",
"signed long", "unsigned long", "long",
"float",
"double",
"void"
};
vector<token> tokens;
set<token> ids;
vector<token> numbers;
for (auto it = lexemes.begin(); it != lexemes.end(); it++)
{
string lexeme = *it;
auto tokens_instances_it = tokens_instances.find(lexeme);
if (tokens_instances_it != tokens_instances.end())
{
tokens.emplace_back(tokens_instances_it->second);
continue;
}
if (lexeme == "signed" || lexeme == "unsigned")
{
it++;
lexeme += ' ' + *it;
}
if (tokens_datatypes.find(lexeme) != tokens_datatypes.end())
{
tokens.emplace_back(token(datatype, lexeme));
continue;
}
if (regex_match(lexeme, numberRegEx))
{
token numberToken = token(number, lexeme);
tokens.emplace_back(numberToken);
numbers.emplace_back(numberToken);
continue;
}
if (regex_match(lexeme, idRegEx))
{
token idToken = token(id, lexeme);
tokens.emplace_back(idToken);
ids.emplace(idToken);
continue;
}
throw "Can not recognize the lexeme: " + lexeme; // Если лексема не распознается
}
return make_tuple(tokens, ids, numbers);
}
string syntaxAnalyzer(const vector<token> &tokens)
{
string successMessage = "Program is correct.";
pair<string, size_t> result;
result = rule_s(tokens, 0);
if (!result.first.empty())
{
return result.first + " at pointer index = " + to_string(result.second);
}
if (result.second < tokens.size())
{
return "Error: incorrect token at the end " + tokens[result.second].get_value();
}
return successMessage;
}
bool recognizeExpectedToken(const vector<token> &tokens, size_t index, const tokenType &expected_type)
{
return index < tokens.size() && tokens[index].get_type() == expected_type;
}
string getErrorMessage(const vector<token> &tokens, size_t index, string expectedToken)
{
string errorMessage = "Error: " + (index < tokens.size() ? "incorrect token near " + tokens[index].get_value() +
", expected token " + expectedToken
: "wrong end of program");
return errorMessage;
}
pair<string, size_t> rule_s(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, datatype))
{
return make_pair(getErrorMessage(tokens, index, "<T>"), index);
}
index++;
resultOfSubRules = rule_i(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_curly_left))
{
return make_pair(getErrorMessage(tokens, index, "<{>"), index);
}
index++;
resultOfSubRules = rule_m(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_curly_right))
{
return make_pair(getErrorMessage(tokens, index, "<}>"), index);
}
index++;
/*
resultOfSubRules = rule_h(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
*/
return make_pair("", index);
}
/*
pair<string, size_t> rule_h(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = rule_s(tokens, index);
if (!resultOfSubRules.first.empty())
{
return make_pair("", index);
}
index = resultOfSubRules.second;
return make_pair("", index);
}
*/
pair<string, size_t> rule_i(const vector<token> &tokens, size_t index)
{
if (!recognizeExpectedToken(tokens, index, id))
{
return make_pair(getErrorMessage(tokens, index, "<ID, n>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> rule_n(const vector<token> &tokens, size_t index)
{
if (!recognizeExpectedToken(tokens, index, number))
{
return make_pair(getErrorMessage(tokens, index, "<D, n>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> rule_m(const vector<token> &tokens, size_t index)
{
do {
pair<string, size_t> resultOfSubRules;
resultOfSubRules = subrule_m_1(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_2(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_3(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_4(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_5(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_6(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_7(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
resultOfSubRules = subrule_m_8(tokens, index);
if (resultOfSubRules.first.empty())
{
index = resultOfSubRules.second;
continue;
}
break;
} while (true);
return make_pair("", index);
}
pair<string, size_t> subrule_m_1(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, datatype))
{
return make_pair(getErrorMessage(tokens, index, "<T>"), index);
}
index++;
resultOfSubRules = rule_a(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, semicolon))
{
return make_pair(getErrorMessage(tokens, index, "<;>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_m_2(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = rule_a(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, semicolon))
{
return make_pair(getErrorMessage(tokens, index, "<;>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_m_3(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, for_))
{
return make_pair(getErrorMessage(tokens, index, "<for>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
resultOfSubRules = rule_a(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, semicolon))
{
return make_pair(getErrorMessage(tokens, index, "<;>"), index);
}
index++;
resultOfSubRules = rule_b(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, semicolon))
{
return make_pair(getErrorMessage(tokens, index, "<;>"), index);
}
index++;
resultOfSubRules = rule_a(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_curly_left))
{
return make_pair(getErrorMessage(tokens, index, "<{>"), index);
}
index++;
resultOfSubRules = rule_m(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_curly_right))
{
return make_pair(getErrorMessage(tokens, index, "<}>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_m_4(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, while_))
{
return make_pair(getErrorMessage(tokens, index, "<while>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
resultOfSubRules = rule_b(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_curly_left))
{
return make_pair(getErrorMessage(tokens, index, "<{>"), index);
}
index++;
resultOfSubRules = rule_m(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_curly_right))
{
return make_pair(getErrorMessage(tokens, index, "<}>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_m_5(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, do_))
{
return make_pair(getErrorMessage(tokens, index, "<do>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_curly_left))
{
return make_pair(getErrorMessage(tokens, index, "<{>"), index);
}
index++;
resultOfSubRules = rule_m(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_curly_right))
{
return make_pair(getErrorMessage(tokens, index, "<}>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, while_))
{
return make_pair(getErrorMessage(tokens, index, "<while>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
resultOfSubRules = rule_b(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_m_6(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, if_))
{
return make_pair(getErrorMessage(tokens, index, "<if>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
resultOfSubRules = rule_b(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
if (!recognizeExpectedToken(tokens, index, bracket_curly_left))
{
return make_pair(getErrorMessage(tokens, index, "<{>"), index);
}
index++;
resultOfSubRules = rule_m(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_curly_right))
{
return make_pair(getErrorMessage(tokens, index, "<}>"), index);
}
index++;
resultOfSubRules = rule_f(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> subrule_m_7(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, return_))
{
return make_pair(getErrorMessage(tokens, index, "<return>"), index);
}
index++;
resultOfSubRules = rule_o(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, semicolon))
{
return make_pair(getErrorMessage(tokens, index, "<;>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_m_8(const vector<token> &tokens, size_t index)
{
if (!recognizeExpectedToken(tokens, index, semicolon))
{
return make_pair(getErrorMessage(tokens, index, "<;>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> rule_a(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = subrule_a_1(tokens, index);
if (resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
resultOfSubRules = subrule_a_2(tokens, index);
if (resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
resultOfSubRules = subrule_a_3(tokens, index);
if (resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
resultOfSubRules = rule_i(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> subrule_a_1(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = rule_i(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, comma))
{
return make_pair(getErrorMessage(tokens, index, "<,>"), index);
}
index++;
resultOfSubRules = rule_a(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> subrule_a_2(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = rule_i(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, assignment))
{
return make_pair(getErrorMessage(tokens, index, "<=>"), index);
}
index++;
resultOfSubRules = rule_o(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, comma))
{
return make_pair(getErrorMessage(tokens, index, "<,>"), index);
}
index++;
resultOfSubRules = rule_a(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> subrule_a_3(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = rule_i(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, assignment))
{
return make_pair(getErrorMessage(tokens, index, "<=>"), index);
}
index++;
resultOfSubRules = rule_o(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> rule_o(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
resultOfSubRules = subrule_o_1(tokens, index);
if (resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
resultOfSubRules = subrule_o_2(tokens, index);
if (resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
resultOfSubRules = subrule_o_3(tokens, index);
if (resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
resultOfSubRules = rule_d(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> subrule_o_1(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
resultOfSubRules = rule_o(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
resultOfSubRules = rule_q(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
resultOfSubRules = rule_o(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
return make_pair("", index);
}
pair<string, size_t> subrule_o_2(const vector<token> &tokens, size_t index)
{
pair<string, size_t> resultOfSubRules;
if (!recognizeExpectedToken(tokens, index, bracket_left))
{
return make_pair(getErrorMessage(tokens, index, "<(>"), index);
}
index++;
resultOfSubRules = rule_o(tokens, index);
if (!resultOfSubRules.first.empty())
{
return resultOfSubRules;
}
index = resultOfSubRules.second;
if (!recognizeExpectedToken(tokens, index, bracket_right))
{
return make_pair(getErrorMessage(tokens, index, "<)>"), index);
}
index++;
return make_pair("", index);
}
pair<string, size_t> subrule_o_3(const vector<token> &tokens, size_t index)
{