src/Parser.cpp - main - thomas-king/IntegerParser

src/Parser.cpp
86 строк2 KB
AceRodstin
Refactor parser.
02 янв 2023, 17:39
02 янв 2023, 17:39e53dbcf
//
//  Parser.cpp
//  IntegerParser
//
//  Created by Ace Rodstin on 30 Dec 2022.
//

#include "../include/Parser.h"
#include "../include/Builder.h"

using namespace Integer;

class Parser::Error {
    public:
    enum class Reason {
        invalid_character
    };

    Error(Reason reason) {
        this->reason = reason;
    }

    const char* what() {
        switch (reason) {
            case Reason::invalid_character:
                return "Invalid character";
        }
    }

    private:
    Reason reason;
};

int Parser::parse(string literal) {
    Builder builder {};
    builder.configure(literal);

    try {
        auto literal = builder.build();
        auto translation = translate(literal.get(), literal.base);
        return parse(translation, literal.base);
    } catch(invalid_argument exception) {
        throw Error { Error::Reason::invalid_character };
    }
}

string Parser::translate(string literal, Base base) {
    stringstream buffer;

    for (auto character : literal) {
        // Remove _ characters
        if (character != '_') {
            buffer << character;
        }    
    }

    auto translation = buffer.str();

    switch (base) {
        case Base::octal:
            // Remove o character
            translation.erase(translation.begin() + 1);
            break;
        case Base::binary:
            // Remove 0b head
            translation.erase(translation.begin(), translation.begin() + 2);
            break;
        default:
            break;
    }

    return translation;
}

int Parser::parse(string translation, Base base) {
    switch (base) { 
        case Base::decimal:
            return stoi(translation);
        case Base::hexadecimal:
            return stoi(translation, 0, 16);
        case Base::octal:
            return stoi(translation, 0, 8);
        case Base::binary:
            return stoi(translation, 0, 2);
    }
}