87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
//
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// interpreter.hpp
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// curly
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//
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// Created by Bob Polis at 2020-09-05
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// Copyright (c) 2020 SwiftCoder. All rights reserved.
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//
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#ifndef _interpreter_H_
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#define _interpreter_H_
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#include <iostream>
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#include <string>
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#include <vector>
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#include <map>
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#include <stdexcept>
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#include <sstream>
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class syntax_error : public std::runtime_error {
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public:
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syntax_error(const std::string& what_arg, size_t lineno)
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: std::runtime_error {what_arg}, _lineno {lineno} {}
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size_t lineno() const { return _lineno; }
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private:
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size_t _lineno {0};
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};
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class interpreter {
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public:
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interpreter() = default;
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std::string eval(std::istream& in, bool& done);
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private:
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std::vector<std::string> _prog; // program lines without label defs or comments
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std::vector<std::string> _values; // value stack
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std::map<std::string, size_t> _labels; // label name => prog line index
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std::map<std::string, std::string> _vars; // var name => string value
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std::vector<size_t> _calls; // call stack
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size_t _pc {0}; // current program counter (index into _prog)
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std::vector<size_t> _pc_offsets; // removed line indices for prog index => source line
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void reset();
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void exec_instruction(const std::string& code, bool& done);
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// integer operations
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void add();
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void sub();
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void mul();
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void div();
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void mod();
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void abs();
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void neg();
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void inc();
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void dec();
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// string operations
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void dup();
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void rev();
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void slc();
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void idx();
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void cat();
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void len();
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void rot();
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void enl();
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// tests & jumps
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void gto();
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void geq();
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void gne();
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void glt();
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void gle();
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void ggt();
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void gge();
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// subroutines
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void fun();
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void ret();
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// I/O
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void inp();
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void out();
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void err();
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};
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#endif // _interpreter_H_
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