forked from mia/Aegisub
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
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/*
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* OverLua expression engine
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*
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Copyright 2007 Niels Martin Hansen
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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Contact:
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E-mail: <jiifurusu@gmail.com>
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IRC: jfs in #aegisub on irc.rizon.net
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*/
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#ifndef EXPRESSION_ENGINE_H
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#define EXPRESSION_ENGINE_H
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#include <vector>
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#include <string>
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namespace ExpressionEngine {
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// The stack passed around
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typedef std::vector<double> Stack;
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// Type of callable functions
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typedef bool (*FunctionPtr)(Stack &stack, void *data);
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// A callable function
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struct Function {
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// The name of the function
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const char *name;
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// Function pointer; null for builtins
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FunctionPtr function;
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// Function data
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void *data;
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};
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// A machine specification that can compile programs
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struct Specification {
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// The input and output register names
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// The index of a register name in this vector translates to the register's number in the machine
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std::vector<std::string> registers;
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// The callable functions
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std::vector<Function> functions;
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// Just adds standard functions to functions vector
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Specification();
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};
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// Operation type
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enum Opcode {
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INST_PUSH_CONST = 0,
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INST_PUSH_REG,
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INST_ADD,
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INST_SUB,
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INST_MUL,
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INST_DIV,
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INST_POW,
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INST_UNM, // unary minus
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INST_CALL,
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INST_STORE
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};
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// A single program instruction
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struct Instruction {
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Opcode op;
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union {
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double vd; // double value, for const push
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size_t vu; // uint value, for register indices
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struct {
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FunctionPtr vf; // function to call
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void *vfd; // data for function
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};
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};
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};
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// A program is a sequence of instructions
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typedef std::vector<Instruction> Program;
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// A machine running a program
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struct Machine {
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// Values in the registers
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std::vector<double> registers;
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// The program
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Program program;
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// Run the machine.
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// Return true is no errors, false if error
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bool Run();
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// Create a machine from a specification and a program source
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Machine(const Specification &spec, const char *source);
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};
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};
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#endif
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