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import std.stdio;
import std.string;
import chunk;
import parser : Value, Atom, ValueType;
//import parser;
//import dbg;
//import value;
string printableValue(Value val) {
switch (val.type) {
case ValueType.STRING:
return val.as.str;
case ValueType.NUMBER:
return format("%g", val.as.number);
case ValueType.BOOLEAN:
if (val.as.boolean) {
return "true";
} else {
return "false";
}
default:
return "! unknown value type !";
}
}
string atomAsString(Atom a) {
return printableValue(a.value);
}
int constantInstruction(string message, Chunk chunk, int offset) {
ubyte idx = chunk.code[offset + 1];
//writeln("dunno how to write a constant");
writefln("%-16s %4d '%s'", message, idx, printableValue(chunk.constants[idx]));
//writefln("%-16s %4d '%s'", message, idx, atomAsString(chunk.constants[idx]));
return offset + 2;
}
int simpleInstruction(string message, int offset) {
writeln(message);
return offset + 1;
}
int disassemble(Chunk chunk, int offset) {
writef("%04d %4d ", offset, chunk.lines[offset]);
ubyte inst = chunk.code[offset];
switch (inst) {
case OpCode.OP_ADD:
return simpleInstruction("OP_ADD", offset);
case OpCode.OP_CONSTANT:
return constantInstruction("OP_CONSTANT", chunk, offset);
case OpCode.OP_NEGATE:
return simpleInstruction("OP_NEGATE", offset);
case OpCode.OP_POP:
return simpleInstruction("OP_POP", offset);
case OpCode.OP_RETURN:
return simpleInstruction("OP_RETURN", offset);
default:
writeln("unknown opcode?");
return offset + 1;
}
return 0;
}
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