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module state.stack;
import std.conv;
import std.string;
import std.variant;
import std.container : SList;
alias Token = Algebraic!(int, bool, string);
alias Stack = SList;
Stack!Token stack;
Token toToken(string value) {
if ( value.isNumeric ) {
return Token(parse!int(value));
} else {
return Token(value);
}
}
Token top(ref Stack!Token stack) {
if ( stack.empty ) {
throw new Exception("stack is empty");
} else {
return stack.front;
}
}
Token pop(ref Stack!Token stack) {
Token token = stack.top;
stack.removeFront;
return token;
}
template push(T)
if ( is(T == int) || is(T == bool) || is (T == string) ) {
void push(ref Stack!Token stack, T value) {
stack.push(Token(value));
}
}
void push(ref Stack!Token stack, Token token) {
stack.insertFront(token);
}
void push(ref Stack!Token stack, Stack!Token prefix) {
stack.insertFront(prefix[]);
}
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