91 lines
1.7 KiB
C++
91 lines
1.7 KiB
C++
#include "input_resolver.h"
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#include <string>
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#include <iostream>
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#include <sstream>
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#define delimiter " "
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struct ValidationResult
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{
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bool ok()
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{
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return isItOk;
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}
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char incorrect_token()
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{
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return in_t;
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}
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int next_arg()
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{
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return nextArg;
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}
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bool isItOk;
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char in_t;
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int nextArg;
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};
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ValidationResult validate_token(const std::string &token)
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{
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static const std::string allowedTokens{"+-*/%$qp"};
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char incorrectToken;
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size_t digitpos = -1, counter = 0;
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for (const char c: token)
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{
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if (allowedTokens.find(c) == allowedTokens.npos && !isdigit(c) && !isspace(c))
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return {false, c};
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if (digitpos == -1 && isdigit(c))
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digitpos = counter;
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counter++;
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}
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if (digitpos == -1)
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return {true, token[0], 0};
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int next = stoi(token.substr(digitpos));
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return {true, token[0], next};
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}
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Command resolveCommand()
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{
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std::string st;
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getline(std::cin, st);
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std::string token = st.substr(0, st.find(delimiter));
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auto validation_result = validate_token(token);
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if (!validation_result.ok())
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{
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std::ostringstream os;
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os << "invalid token "<< validation_result.incorrect_token();
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throw std::runtime_error{os.str()};
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}
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bool shouldQuit = token.find("q") != token.npos;
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bool shouldPrint = token.find("p") != token.npos;
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char operation = 0;
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for (const char c: token)
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{
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static const std::string operators {"+-*/%$"};
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if(operators.find(c) != operators.npos)
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{
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operation = c;
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}
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}
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if (operation == 0)
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{
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operation = '+';
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}
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return {shouldQuit, operation, validation_result.next_arg(), shouldPrint};
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} |