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module primitives.core;
import std.stdio;
import base.stack;
bool handle(string word) {
switch ( word ) {
case "$" : binary_op_variable_bind; break;
case "@" : unary_op_variable_resolve; break;
case "+" : binary_op_add; break;
case "*" : binary_op_multiply; break;
case "/" : binary_op_divide; break;
case "%" : binary_op_modulo; break;
case "." : unary_op_io_print; break;
case "pop" : unary_op_stack_pop; break;
case "dup" : unary_op_stack_dup; break;
case "swp" : binary_op_stack_swp; break;
case "true" : nullary_op_value_bool(true); break;
case "false" : nullary_op_value_bool(false); break;
case "<" : binary_cond_lt; break;
case "=" : binary_cond_eq; break;
default : return false;
}
return true;
}
private {
Token[string] variables;
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 nullary_op_value_bool(bool value) {
stack.push(Token(value));
}
}
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