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module src.primitives;
import std.stdio;
import src.stack;
import src.definition;
int[string] variables;
bool drop_mode;
bool evaluate(int value) {
return drop_mode;
}
bool evaluate(string word) {
if ( drop_mode ) {
if ( word == "then" ) {
drop_mode = false;
}
return true;
}
switch ( word ) {
case "§":
src.definition.start;
return true;
case "$":
string name = stack.pop.get!string;
int value = stack.pop.get!int;
variables[name] = value;
return true;
case "@":
string name = stack.pop.get!string;
if ( name in variables ) {
stack.push(variables[name]);
}
return true;
case "if":
switch ( stack.pop.get!int ) {
case 0:
drop_mode = true;
return true;
case 1:
drop_mode = false;
return true;
default:
throw new Exception("invalid logic value");
}
case "then":
drop_mode = false;
return true;
case "+":
int b = stack.pop.get!int;
int a = stack.pop.get!int;
stack.push(a + b);
return true;
case "*":
int b = stack.pop.get!int;
int a = stack.pop.get!int;
stack.push(a * b);
return true;
case "/":
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);
}
return true;
case "%":
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);
}
return true;
case ".":
stack.pop;
return true;
case "'":
writeln(stack.top);
return true;
default:
return false;
}
}
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