src/exprtest.cc

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// $Id: exprtest.cc 18 2007-08-19 19:51:52Z tb $

#include <iostream>
#include <fstream>

#include "driver.h"
#include "expression.h"

int main(int argc, char *argv[])
{
    CalcContext calc;
    example::Driver driver(calc);
    bool readfile = false;

    for(int ai = 1; ai < argc; ++ai)
    {
        if (argv[ai] == std::string ("-p")) {
            driver.trace_parsing = true;
        }
        else if (argv[ai] == std::string ("-s")) {
            driver.trace_scanning = true;
        }
        else
        {
            // read a file with expressions

            std::fstream infile(argv[ai]);
            if (!infile.good())
            {
                std::cerr << "Could not open file: " << argv[ai] << std::endl;
                return 0;
            }

            calc.clearExpressions();
            bool result = driver.parse_stream(infile, argv[ai]);
            if (result)
            {
                std::cout << "Expressions:" << std::endl;
                for (unsigned int ei = 0; ei < calc.expressions.size(); ++ei)
                {
                    std::cout << "[" << ei << "]:" << std::endl;
                    std::cout << "tree:" << std::endl;
                    calc.expressions[ei]->print(std::cout);
                    std::cout << "evaluated: "
                              << calc.expressions[ei]->evaluate()
                              << std::endl;
                }
            }

            readfile = true;
        }
    }

    if (readfile) return 0;
    
    std::cout << "Reading expressions from stdin" << std::endl;

    std::string line;
    while( std::cout << "input: " &&
           std::getline(std::cin, line) &&
           !line.empty() )
    {
        calc.clearExpressions();
        bool result = driver.parse_string(line, "input");

        if (result)
        {
            for (unsigned int ei = 0; ei < calc.expressions.size(); ++ei)
            {
                std::cout << "tree:" << std::endl;
                calc.expressions[ei]->print(std::cout);
                std::cout << "evaluated: "
                          << calc.expressions[ei]->evaluate()
                          << std::endl;
            }
        }
    }
}

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