parse.hpp File Reference

#include <cstdlib>
#include <istream>
#include <locale>
#include <ostream>
#include <string>
#include "calc_error.hpp"
#include "node.hpp"

Go to the source code of this file.

Classes
class	parser

Functions
void	parse_loop (std::istream &input, std::ostream &output)

Function Documentation

void parse_loop	(	std::istream &	input,
		std::ostream &	output
	)

Parse loop. Read expressions from input and print results to output.

Parameters

input	The input stream.
output	The output stream.

Definition at line 421 of file parse.cpp.

References parser::get_statement().

Referenced by BOOST_AUTO_TEST_CASE(), and main().

{
  std::string line{};
  // No portable way to test whether the console is an interactive terminal
  // vs. a non-interactive file. If you have a system-specific way to test,
  // output the prompt only for the interactive case.
  for (output << "> "; std::getline(input, line); output << "> ") {
    std::istringstream input{std::move(line)};
    parser p(input);
    try {
      while (p.get_statement(output)) {
        /* empty */
      }
    } catch(calc_error const& ex) {
      output << ex.what() << '\n';
    } catch(std::exception const& ex) {
      output << "exception: " << ex.what() << '\n';
    }
  }
}