Puca

#include "Parser.h"
#include "LinearEquation.h"
#include "Error.h"
#include <string>
#include <cctype>

using namespace std;

ReadFile::ReadFile(const string& s) : fileName(s) {
    f.open(s);
    if (!f.is_open())
        throw Bad_File_Name(s);
}

int ReadFile::ReadChar() {
    pos++;
    return f.get();
}

void ReadFile::ReadSpaces() {
    while(isspace(f.peek())) { // remove spaces before sign
        ReadChar();
    }
}



double ReadFile::ReadNumber(bool first) {
    ReadSpaces();

    int sign = 1;
    double num = 0, power = 1;
    if (f.peek() == '+') { // remove sign
        ReadChar();
        sign = 1;
    } else if (f.peek() == '-') {
        ReadChar();
        sign = -1;
    }

    ReadSpaces();

    if (islower(f.peek()) || isupper(f.peek())) // there is no number
        return sign;
    else if (!first) // there is no sign, not first
        throw Bad_Sign(line, pos, fileName);


    while (isdigit(f.peek())) { // before '.'
        num = num * 10 + ReadChar() - '0';
    }

    if (f.peek() == '.') {
        ReadChar();
    } else if (islower(f.peek()) || isupper(f.peek()))
        return num;
    else
        throw Bad_Number(line, pos, fileName);

    while (f.peek() <= '9' && f.peek() >= '0') { //after '.'
        power /= 10;
        num += power * (ReadChar() - '0');
    }
    return num;
}

string* ReadFile::ReadVariable() {
    ReadSpaces();

    string* sol = new string;

    while (!isspace(f.peek()) && f.peek() != '+' && f.peek() != '-' && f.peek() != '=') {
        sol->push_back(ReadChar());
    }

    while (isspace(f.peek()) && f.peek() != '\n')
        ReadChar();

    return sol;
}
LinearEquation* ReadFile::ReadLine() {
    LinearEquation* le = new LinearEquation;
    LinearEquation les;

    line++;
    pos = 1;

    string* var;
    int num;
    num = ReadNumber(true);
    var = ReadVariable()
    *le;
//    (*le)[(*var)] += num;

    ReadSpaces();

    while (f.peek() != '=') {
        num = ReadNumber();
        var = ReadVariable()
        (*le)[*var] += num;
    }
    while (f.peek() != '\n') {
        num = -ReadNumber();
        var = ReadVariable();
        (*le)[*var] += num;
    }

    return le;
}

SystemOfLinearEquations* ReadFile::ReadSystem() {
    nullptr;
}