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Tweak some String.prototype.substring() usage

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In a few spots the `indexEnd` parameter is explicitly set to the string-length, which is unnecessary since that's the default value if the parameter is omitted; note https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring#description

In the `XMLParserBase.prototype._resolveEntities` method the `substring` usage can be replaced with an updated (and cached) regular expression that directly finds numbers.
This commit is contained in:
Jonas Jenwald 2026-06-24 11:31:00 +02:00
parent 04eeeec4a4
commit 6718c2924c
3 changed files with 14 additions and 8 deletions
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2
src/core/annotation.js
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@ -3108,7 +3108,7 @@ class TextWidgetAnnotation extends WidgetAnnotation {
}
if (startChunk < line.length) {
chunks.push(line.substring(startChunk, line.length));
chunks.push(line.substring(startChunk));
}
return chunks;

4
src/core/core_utils.js
View File

@ -386,7 +386,7 @@ function escapePDFName(str) {
}
if (start < str.length) {
buffer.push(str.substring(start, str.length));
buffer.push(str.substring(start));
}
return buffer.join("");
@ -545,7 +545,7 @@ function encodeToXmlString(str) {
return str;
}
if (start < str.length) {
buffer.push(str.substring(start, str.length));
buffer.push(str.substring(start));
}
return buffer.join("");
}

16
src/core/xml_parser.js
View File

@ -17,6 +17,7 @@
// https://github.com/mozilla/shumway/blob/16451d8836fa85f4b16eeda8b4bda2fa9e2b22b0/src/avm2/natives/xml.ts
import { encodeToXmlString } from "./core_utils.js";
import { shadow } from "../shared/util.js";
const XMLParserErrorCode = {
NoError: 0,
@ -47,12 +48,17 @@ function isWhitespaceString(s) {
}
class XMLParserBase {
static get _entityRegex() {
return shadow(this, "_entityRegex", /&(?:#x([^;]+)|#([^;]+)|([^;]+));/g);
}
_resolveEntities(s) {
return s.replaceAll(/&([^;]+);/g, (all, entity) => {
if (entity.substring(0, 2) === "#x") {
return String.fromCodePoint(parseInt(entity.substring(2), 16));
} else if (entity.at(0) === "#") {
return String.fromCodePoint(parseInt(entity.substring(1), 10));
return s.replaceAll(XMLParserBase._entityRegex, (_, hex, dec, entity) => {
if (hex) {
return String.fromCodePoint(parseInt(hex, 16));
}
if (dec) {
return String.fromCodePoint(parseInt(dec, 10));
}
switch (entity) {
case "lt":