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microoptimizations

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velzie 2024-09-02 15:52:19 -04:00
parent bcbc14a03b
commit 35eb307d4d
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1 changed files with 21 additions and 11 deletions
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32
src/client/shared/sourcemaps.ts
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@ -17,6 +17,8 @@ export default function (client: ScramjetClient, self: Self) {
configurable: false,
});
const scramtag_ident = "/*scramtag ";
// when we rewrite javascript it will make function.toString leak internals
// this can lead to double rewrites which is bad
client.Proxy("Function.prototype.toString", {
@ -27,25 +29,24 @@ export default function (client: ScramjetClient, self: Self) {
// every function rewritten will have a scramtag comment
// it will look like this:
// function name() /*scramtag [index] [tag] */ { ... }
const scramtag_ident = "/*scramtag ";
const scramtagstart = stringified.indexOf(scramtag_ident);
const scramtagstart = stringified.indexOf("/*s");
if (scramtagstart === -1) return ctx.return(stringified); // it's either a native function or something stolen from scramjet itself
const firstspace = stringified.indexOf(
" ",
scramtagstart + scramtag_ident.length
);
// [index] holds the index of the first character in the scramtag (/)
const abstagindex = parseInt(
stringified
.substring(scramtagstart + scramtag_ident.length)
.split(" ")[0]
stringified.substring(scramtagstart + scramtag_ident.length, firstspace)
);
// subtracting that from the index of the scramtag gives us the starting index of the function relative to the entire file
let absindex = abstagindex - scramtagstart;
const scramtagend = stringified.indexOf("*/", scramtagstart);
const tag = stringified
.substring(scramtagstart + scramtag_ident.length, scramtagend)
.split(" ")[1];
const tag = stringified.substring(firstspace + 1, scramtagend);
// delete all scramtags inside the function (and nested ones!!)
stringified = stringified.replace(/\/\*scramtag.*?\*\//g, "");
@ -54,8 +55,14 @@ export default function (client: ScramjetClient, self: Self) {
let i = 0;
let offset = 0;
for (const [str, start, end] of maps) {
if (start < absindex) continue;
let j = 0;
while (j < maps.length) {
const [str, start, end] = maps[j];
if (start < absindex) {
j++;
continue;
}
if (start - absindex + offset > stringified.length) break;
// ooh i should really document this before i forget how it works
@ -63,9 +70,12 @@ export default function (client: ScramjetClient, self: Self) {
newString += str;
offset += end - start - str.length;
i = start - absindex + offset + str.length;
j++;
}
return ctx.return(newString + stringified.slice(i));
newString += stringified.slice(i);
return ctx.return(newString);
},
});
}