blob: 680587352b7db5decfd2e3ab68d980a2cf66551c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
module src.stack;
import std.variant;
import std.string;
import std.container : SList;
static import src.definition;
alias Token = Algebraic!(int, string);
alias Stack = SList;
Stack!Token stack;
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;
}
void push(ref Stack!Token stack, Token token) {
if ( !token.visit!(
(int x ) => src.definition.handle(x),
(string word) => src.definition.handle(word)
) ) {
stack.insertFront(token);
}
}
void push(ref Stack!Token stack, int value) {
stack.push(Token(value));
}
void push(ref Stack!Token stack, string word) {
stack.push(Token(word));
}
|