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ui: rewrite css parser -> urlResolve.ts

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nick-delirium 2024-10-30 15:04:40 +01:00
parent c36946ee9e
commit b928ddb53c
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1 changed files with 31 additions and 49 deletions
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76
frontend/app/player/web/messages/rewriter/urlResolve.ts
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@ -1,64 +1,46 @@
export function resolveURL(baseURL: string, relURL: string): string {
if (relURL.startsWith('#') || relURL === "") {
if (relURL.startsWith('#') || relURL === '') {
return relURL;
}
return new URL(relURL, baseURL).toString();
}
// url("url") or url('url') or url(url)
const re1 = /url\(("[^"]*"|'[^']*'|[^)]*)\)/g
// @import "url" or @import 'url'
const re2 = /@import (["'])(.*?)\1/g
function cssUrlsIndex(css: string): Array<[number, number]> {
const idxs: Array<[number, number]> = [];
const i1 = css.matchAll(re1);
// @ts-ignore
for (let m of i1) {
// @ts-ignore
const s: number = m.index + m[0].indexOf(m[1]);
const e: number = s + m[1].length;
idxs.push([s, e]);
function rewriteCSSLinks(
css: string,
rewriter: (rawurl: string) => string
): string {
// Replace url() functions
css = css.replace(/url\(\s*(['"]?)(.*?)\1\s*\)/gs, (match, quote, url) => {
let newurl = rewriter(url.trim());
return `url(${quote}${newurl}${quote})`;
});
// Replace @import statements
css = css.replace(
/@import\s+(url\(\s*(['"]?)(.*?)\2\s*\)|(['"])(.*?)\4)([^;]*);?/gs,
(match, _, quote1, url1, quote2, url2, media) => {
let url = url1 || url2;
let newurl = rewriter(url.trim());
let quote = quote1 || quote2 || '';
return `@import ${
quote ? `url(${quote}${newurl}${quote})` : `"${newurl}"`
}${media};`;
}
const i2 = css.matchAll(re2);
// @ts-ignore
for (let m of i2) {
// @ts-ignore
const s = m.index + m[0].indexOf(m[1]);
const e = s + m[1].length;
idxs.push([s, e])
}
return idxs.reverse()
}
function unquote(str: string): [string, string] {
if (str.length <= 2) {
return [str, ""]
}
if (str[0] == '"' && str[str.length-1] == '"') {
return [ str.substring(1, str.length-1), "\""];
}
if (str[0] == '\'' && str[str.length-1] == '\'') {
return [ str.substring(1, str.length-1), "'" ];
}
return [str, ""]
}
function rewriteCSSLinks(css: string, rewriter: (rawurl: string) => string): string {
for (let idx of cssUrlsIndex(css)) {
const f = idx[0]
const t = idx[1]
const [ rawurl, q ] = unquote(css.substring(f, t));
css = css.substring(0,f) + q + rewriter(rawurl) + q + css.substring(t);
}
return css
);
// Ensure the CSS ends with a semicolon
const hasSemi = css.trim().endsWith(';');
return hasSemi ? css : css + ';';
}
function rewritePseudoclasses(css: string): string {
return css
.replace(/:hover/g, ".-openreplay-hover")
.replace(/:focus/g, ".-openreplay-focus")
.replace(/:hover/g, '.-openreplay-hover')
.replace(/:focus/g, '.-openreplay-focus');
}
export function resolveCSS(baseURL: string, css: string): string {
return rewritePseudoclasses(
rewriteCSSLinks(css, rawurl => resolveURL(baseURL, rawurl))
rewriteCSSLinks(css, (rawurl) => resolveURL(baseURL, rawurl))
);
}