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same for padStart

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This commit is contained in:
dcode
2019-03-11 01:29:12 +01:00
parent ebe92c62a8
commit 1198e71236
3 changed files with 259 additions and 356 deletions
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37
std/assembly/string.ts
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@ -303,27 +303,24 @@ export class String extends StringBase {
return REGISTER<String>(out);
}
padStart(targetLength: i32, padString: String = changetype<String>(" ")): String {
padStart(targetLength: i32, padString: string = " "): String {
assert(this !== null);
var length = this.length;
var padLen = padString.length;
if (targetLength < length || !padLen) return this;
var len = targetLength - length;
var out = ALLOC(<usize>targetLength << 1);
if (len > padLen) {
let count = (len - 1) / padLen;
let base = count * padLen;
let rest = len - base;
memory.repeat(out, changetype<usize>(padString), <usize>padString.length << 1, count);
if (rest) {
memory.copy(out + (<usize>base << 1), changetype<usize>(padString), <usize>rest << 1);
}
var thisSize = <usize>this.length << 1;
var targetSize = <usize>targetLength << 1;
var padSize = <usize>padString.length << 1;
if (targetSize < thisSize || !padSize) return this;
var prependSize = targetSize - thisSize;
var out = ALLOC(targetSize);
if (prependSize > padSize) {
let repeatCount = (prependSize - 2) / padSize;
let restBase = repeatCount * padSize;
let restSize = prependSize - restBase;
memory.repeat(out, changetype<usize>(padString), padSize, repeatCount);
memory.copy(out + restBase, changetype<usize>(padString), restSize);
} else {
memory.copy(out, changetype<usize>(padString), <usize>len << 1);
}
if (length) {
memory.copy(out + (<usize>len << 1), changetype<usize>(this), <usize>length << 1);
memory.copy(out, changetype<usize>(padString), prependSize);
}
memory.copy(out + prependSize, changetype<usize>(this), thisSize);
return REGISTER<String>(out);
}
@ -341,9 +338,7 @@ export class String extends StringBase {
let restBase = repeatCount * padSize;
let restSize = appendSize - restBase;
memory.repeat(out + thisSize, changetype<usize>(padString), padSize, repeatCount);
if (restSize) {
memory.copy(out + thisSize + restBase, changetype<usize>(padString), restSize);
}
memory.copy(out + thisSize + restBase, changetype<usize>(padString), restSize);
} else {
memory.copy(out + thisSize, changetype<usize>(padString), appendSize);
}