Mercurial > jwe > qt-gui-with-push-parser

annotate interpreter.cpp @ 9:822a2fe5bb51

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move command window to separate file and other refactoring
author John W. Eaton <jwe@octave.org>
date Thu, 23 May 2019 12:36:26 -0400
parents 04867eba6428
children 894be158b32d
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1 #include <iostream>
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2 #include <string>
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4 #include <unistd.h>
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6 #include "interpreter.h"
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7 #include "parser.h"
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9 #include "gui-main.h"
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10 #include "tty-main.h"
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12 namespace calc
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13 {
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14 interpreter *interpreter::the_interpreter = nullptr;
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16 interpreter::interpreter (void)
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17 : m_error_handler ([] (const char *msg)
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18 { std::cerr << "error: " << msg << std::endl; }),
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19 m_result_handler ([] (double value)
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20 { std::cout << "ans = " << value << std::endl; })
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21 {
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22 if (the_interpreter)
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23 {
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24 std::cerr << "multiple interpreters are not possible!" << std::endl;
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25 exit (1);
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26 }
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28 the_interpreter = this;
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30 parser::init ();
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31 }
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33 interpreter::~interpreter (void)
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34 {
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35 parser::fini ();
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36 }
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38 int interpreter::parse_and_execute (const std::string& line)
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39 {
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40 return parser::parse_and_execute (line);
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41 }
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43 void interpreter::emit_result (double value)
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44 {
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45 // Simulate a delay in calculation.
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46 sleep (1);
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48 m_result_handler (value);
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49 }
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51 void interpreter::emit_error (const char *msg)
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52 {
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53 m_error_handler (msg);
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54 }
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55 }