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annotate interpreter.h @ 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 04867eba6428
children 1e5a1e15fa56
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1 #if ! defined (calc_interpreter_h)
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2 #define calc_interpreter_h 1
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4 #include <functional>
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6 #include "parser.h"
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8 namespace calc
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9 {
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10 class interpreter
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11 {
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12 public:
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14 static interpreter *the_interpreter;
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16 interpreter (void);
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18 interpreter (const interpreter&) = delete;
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20 interpreter& operator = (const interpreter&) = delete;
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22 ~interpreter (void) = default;
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24 parser& get_parser (void) { return m_parser; }
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26 int parse_and_execute (const std::string& line);
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28 std::function<void (const char *)>
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29 set_error_handler (const std::function<void (const char *)>& error_handler)
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30 {
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31 std::function<void (const char *)> tmp = m_error_handler;
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32 m_error_handler = error_handler;
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33 return tmp;
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34 }
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36 std::function<void (double)>
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37 set_result_handler (const std::function<void (double)>& result_handler)
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38 {
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39 std::function<void (double)> tmp = m_result_handler;
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40 m_result_handler = result_handler;
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41 return tmp;
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42 }
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44 void emit_error (const char *msg) const;
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46 void emit_result (double value) const;
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48 private:
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50 parser m_parser;
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51
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52 std::function<void (const char *)> m_error_handler;
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53 std::function<void (double)> m_result_handler;
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54 };
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55 }
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57 #endif