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Add string comparison operator overloads (#64)

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This commit is contained in:
Max Graey
2018-04-04 22:50:40 +03:00
committed by Daniel Wirtz
parent 5e20bed09a
commit e790eb757f
4 changed files with 1656 additions and 190 deletions
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85
std/assembly/string.ts
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@ -127,6 +127,91 @@ export class String {
);
}
@operator("!=")
private static __ne(left: String, right: String): bool {
return !this.__eq(left, right);
}
@operator(">")
private static __gt(left: String, right: String): bool {
if (!changetype<usize>(left) || !changetype<usize>(right)) {
return false;
}
var leftLength = left.length;
var rightLength = right.length;
if (!leftLength) return false;
if (!rightLength) return true;
var length = <usize>min<i32>(leftLength, rightLength);
return compare_memory(
changetype<usize>(left) + HEADER_SIZE,
changetype<usize>(right) + HEADER_SIZE,
length << 1
) > 0;
}
@operator(">=")
private static __gte(left: String, right: String): bool {
if (!changetype<usize>(left) || !changetype<usize>(right)) {
return false;
}
var leftLength = left.length;
var rightLength = right.length;
if (!leftLength) return !rightLength;
if (!rightLength) return true;
var length = <usize>min<i32>(leftLength, rightLength);
return compare_memory(
changetype<usize>(left) + HEADER_SIZE,
changetype<usize>(right) + HEADER_SIZE,
length << 1
) >= 0;
}
@operator("<")
private static __lt(left: String, right: String): bool {
if (!changetype<usize>(left) || !changetype<usize>(right)) {
return false;
}
var leftLength = left.length;
var rightLength = right.length;
if (!rightLength) return false;
if (!leftLength) return true;
var length = <usize>min<i32>(leftLength, rightLength);
return compare_memory(
changetype<usize>(left) + HEADER_SIZE,
changetype<usize>(right) + HEADER_SIZE,
length << 1
) < 0;
}
@operator("<=")
private static __lte(left: String, right: String): bool {
if (!changetype<usize>(left) || !changetype<usize>(right)) {
return false;
}
var leftLength = left.length;
var rightLength = right.length;
if (!rightLength) return !leftLength;
if (!leftLength) return true;
var length = <usize>min<i32>(leftLength, rightLength);
return compare_memory(
changetype<usize>(left) + HEADER_SIZE,
changetype<usize>(right) + HEADER_SIZE,
length << 1
) <= 0;
}
includes(searchString: String, position: i32 = 0): bool {
return this.indexOf(searchString, position) != -1;
}