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Add String#repeat method (#67)

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This commit is contained in:
Max Graey
2018-04-07 19:59:26 +03:00
committed by Daniel Wirtz
parent f1b00c90be
commit b7ef21950b
8 changed files with 897 additions and 62 deletions
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52
std/assembly/string.ts
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@ -111,7 +111,7 @@ export class String {
@operator("==")
private static __eq(left: String, right: String): bool {
if (left === right) return true;
if (left === null) return right === null;
if (left === null) return right === null;
if (right === null) return false;
var leftLength = left.length;
@ -131,7 +131,7 @@ export class String {
@operator(">")
private static __gt(left: String, right: String): bool {
if (left === null || right === null) return false;
if (left === right || left === null || right === null) return false;
var leftLength = left.length;
var rightLength = right.length;
@ -149,8 +149,9 @@ export class String {
@operator(">=")
private static __gte(left: String, right: String): bool {
if (left === null) return right === null;
else if (right === null) return false;
if (left === right) return true;
if (left === null) return right === null;
if (right === null) return false;
var leftLength = left.length;
var rightLength = right.length;
@ -168,7 +169,7 @@ export class String {
@operator("<")
private static __lt(left: String, right: String): bool {
if (left === null || right === null) return false;
if (left === right || left === null || right === null) return false;
var leftLength = left.length;
var rightLength = right.length;
@ -186,8 +187,9 @@ export class String {
@operator("<=")
private static __lte(left: String, right: String): bool {
if (left === null) return right === null;
else if (right === null) return false;
if (left === right) return true;
if (left === null) return right === null;
if (right === null) return false;
var leftLength = left.length;
var rightLength = right.length;
@ -231,6 +233,7 @@ export class String {
startsWith(searchString: String, position: i32 = 0): bool {
assert(this !== null);
if (searchString === null) searchString = changetype<String>("null");
var pos: isize = position;
var len: isize = this.length;
var start: isize = min<isize>(max<isize>(pos, 0), len);
@ -292,6 +295,7 @@ export class String {
trim(): String {
assert(this !== null);
var length: usize = this.length;
while (
length &&
isWhiteSpaceOrLineTerminator(
@ -377,6 +381,40 @@ export class String {
);
return out;
}
repeat(count: i32 = 0): String {
assert(this !== null);
var length = this.length;
// Most browsers can't handle strings 1 << 28 chars or longer
if (count < 0 || length * count > (1 << 28)) {
throw new RangeError("Invalid count value");
}
if (count === 0 || !length) return EMPTY;
if (count === 1) return this;
var result = allocate(length * count);
var strLen = length << 1;
/*
* TODO possible improvments: reuse existing result for exponentially concats like:
* 'a' + 'a' => 'aa' + 'aa' => 'aaaa' + 'aaaa' etc
*/
for (let offset = 0, len = strLen * count; offset < len; offset += strLen) {
move_memory(
changetype<usize>(result) + HEADER_SIZE + offset,
changetype<usize>(this) + HEADER_SIZE,
strLen
);
}
return result;
}
toString(): String {
return this;
}
}
export function parseInt(str: String, radix: i32 = 0): f64 {