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annotate interpreter.cpp @ 12:894be158b32d

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define parser as a class and eliminate some global variables
author John W. Eaton <jwe@octave.org>
date Thu, 23 May 2019 17:57:20 -0400
parents 822a2fe5bb51
children 1e5a1e15fa56
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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_parser (*this),
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18 m_error_handler ([] (const char *msg)
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19 { std::cerr << "error: " << msg << std::endl; }),
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20 m_result_handler ([] (double value)
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21 { std::cout << "ans = " << value << std::endl; })
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22 {
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23 if (the_interpreter)
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24 {
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25 std::cerr << "multiple interpreters are not possible!" << std::endl;
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26 exit (1);
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27 }
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29 the_interpreter = this;
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30 }
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32 int interpreter::parse_and_execute (const std::string& line)
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33 {
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34 return m_parser.parse_and_execute (line);
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35 }
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37 void interpreter::emit_result (double value) const
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38 {
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39 // Simulate a delay in calculation.
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40 sleep (1);
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42 m_result_handler (value);
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43 }
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45 void interpreter::emit_error (const char *msg) const
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46 {
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47 m_error_handler (msg);
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48 }
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49 }