module primitives.core;

import std.stdio;

import base.stack;
import definition = base.definition;

Token[string] variables;

void definition_start() {
	definition.start;
}

void binary_op_variable_bind() {
	string name     = stack.pop.get!string;
	Token  value    = stack.pop;
	variables[name] = value;
}

void unary_op_variable_resolve() {
	string name = stack.pop.get!string;

	if ( name in variables ) {
		stack.push(variables[name]);
	}
}

void binary_op_add() {
	int b = stack.pop.get!int;
	int a = stack.pop.get!int;

	stack.push(a + b);
}

void binary_op_multiply() {
	int b = stack.pop.get!int;
	int a = stack.pop.get!int;

	stack.push(a * b);
}

void binary_op_divide() {
	int b = stack.pop.get!int;
	int a = stack.pop.get!int;

	if ( b == 0 ) {
		throw new Exception("division by 0 undefined");
	} else {
		stack.push(a / b);
	}
}

void binary_op_modulo() {
	int b = stack.pop.get!int;
	int a = stack.pop.get!int;

	if ( b == 0 ) {
		throw new Exception("modulo 0 undefined");
	} else {
		stack.push(a % b);
	}
}

void unary_op_io_print() {
	writeln(stack.top);
}

void unary_op_stack_pop() {
	stack.pop;
}

void unary_op_stack_dup() {
	stack.push(stack.top);
}

void binary_op_stack_swp() {
	auto b = stack.pop;
	auto a = stack.pop;

	stack.push(b);
	stack.push(a);

}

void binary_cond_lt() {
	int b = stack.pop.get!int;
	int a = stack.pop.get!int;

	stack.push(a < b);
}

void binary_cond_eq() {
	auto b = stack.pop;
	auto a = stack.pop;

	stack.push(a == b);
}

void integral_value_bool(bool value) {
	stack.push(Token(value));
}