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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, configurable: false,
}); });
const scramtag_ident = "/*scramtag ";
// when we rewrite javascript it will make function.toString leak internals // when we rewrite javascript it will make function.toString leak internals
// this can lead to double rewrites which is bad // this can lead to double rewrites which is bad
client.Proxy("Function.prototype.toString", { client.Proxy("Function.prototype.toString", {
@ -27,25 +29,24 @@ export default function (client: ScramjetClient, self: Self) {
// every function rewritten will have a scramtag comment // every function rewritten will have a scramtag comment
// it will look like this: // it will look like this:
// function name() /*scramtag [index] [tag] */ { ... } // function name() /*scramtag [index] [tag] */ { ... }
const scramtag_ident = "/*scramtag "; const scramtagstart = stringified.indexOf("/*s");
const scramtagstart = stringified.indexOf(scramtag_ident);
if (scramtagstart === -1) return ctx.return(stringified); // it's either a native function or something stolen from scramjet itself 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 (/) // [index] holds the index of the first character in the scramtag (/)
const abstagindex = parseInt( const abstagindex = parseInt(
stringified stringified.substring(scramtagstart + scramtag_ident.length, firstspace)
.substring(scramtagstart + scramtag_ident.length)
.split(" ")[0]
); );
// subtracting that from the index of the scramtag gives us the starting index of the function relative to the entire file // 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; let absindex = abstagindex - scramtagstart;
const scramtagend = stringified.indexOf("*/", scramtagstart); const scramtagend = stringified.indexOf("*/", scramtagstart);
const tag = stringified const tag = stringified.substring(firstspace + 1, scramtagend);
.substring(scramtagstart + scramtag_ident.length, scramtagend)
.split(" ")[1];
// delete all scramtags inside the function (and nested ones!!) // delete all scramtags inside the function (and nested ones!!)
stringified = stringified.replace(/\/\*scramtag.*?\*\//g, ""); stringified = stringified.replace(/\/\*scramtag.*?\*\//g, "");
@ -54,8 +55,14 @@ export default function (client: ScramjetClient, self: Self) {
let i = 0; let i = 0;
let offset = 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; if (start - absindex + offset > stringified.length) break;
// ooh i should really document this before i forget how it works // 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; newString += str;
offset += end - start - str.length; offset += end - start - str.length;
i = start - absindex + offset + str.length; i = start - absindex + offset + str.length;
j++;
} }
return ctx.return(newString + stringified.slice(i)); newString += stringified.slice(i);
return ctx.return(newString);
}, },
}); });
} }