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# parse.cpp File Reference

`#include <sstream>`
`#include "node.hpp"`
`#include "parse.hpp"`

Go to the source code of this file.

## 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 272 of file parse.cpp.

Referenced by BOOST_AUTO_TEST_CASE(), and main().

    00273 {
    00274   std::string line;
    00275   // No portable way to test whether the console is an interactive terminal
    00276   // vs. a non-interactive file. If you have a system-specific way to test,
    00277   // output the prompt only for the interactive case.
    00278   for (output << "> "; std::getline(input, line); output << "> ") {
    00279     std::istringstream input(line);
    00280     parser p(input);
    00281     try {
    00282       node n;
    00283       while (p.get_expr(n))
    00284         output << n.evaluate() << '\n';
    00285     } catch(parse_error const& ex) {
    00286       output << ex.what() << '\n';
    00287     } catch(std::exception const& ex) {
    00288       output << "exception: " << ex.what() << '\n';
    00289     }
    00290   }
    00291 }