Public
Script
v9
February 27, 2024
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const bodyRegex = /(<\/body[>\s])/;
const htmlRegex = /(<\/html[>\s])/;
const bodySplitTag = "</body";
const htmlSplitTag = "</html";
export class InjectHTMLElementStream extends TransformStream<string, string> {
elementSent = false;
buffered = "";
constructor(element: string) {
super({
transform: (chunk, controller) => {
// If something is buffered, add to this transform step
let bufferedChunk = this.buffered + chunk;
this.buffered = "";
// Check if the string contains the closing tags for body or html
if (!this.elementSent) {
if (bufferedChunk.match(bodyRegex)) {
controller.enqueue(bufferedChunk.replace(bodyRegex, `${element}$1`));
this.elementSent = true;
return;
}
if (bufferedChunk.match(htmlRegex)) {
controller.enqueue(bufferedChunk.replace(htmlRegex, `${element}$1`));
this.elementSent = true;
return;
}
// If the chunk ends with a partial match to the body or html string,
// buffer that to be used next chunk. Remove it from the current chunk
const end = bufferedChunk.slice(-7);
for (let i = 1; i <= 6; i++) {
const sliced = bufferedChunk.slice(-i);
if (sliced === bodySplitTag.slice(0, i) || sliced === htmlSplitTag.slice(0, i)) {
this.buffered = sliced;
bufferedChunk = bufferedChunk.slice(0, -i);
break;
}
}
}
// Base case
controller.enqueue(bufferedChunk);
},
flush: (controller) => {
// flush any buffered string
if (this.buffered) {
controller.enqueue(this.buffered);
this.buffered = "";
}
// enqueue element
if (!this.elementSent) {
controller.enqueue(element);
this.elementSent = true;
}
controller.terminate();
},
});
}
}
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v9
February 27, 2024
I think this is inserting $0 after each inserted bit of text, looks like that's in
${element}$0Fixed!