55 lines
No EOL
1.6 KiB
TypeScript
55 lines
No EOL
1.6 KiB
TypeScript
export function resolveURL(baseURL: string, relURL: string): string {
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if (relURL.startsWith('#') || relURL === "") {
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return relURL;
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}
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return new URL(relURL, baseURL).toString();
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}
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const re1 = /url\(("[^"]*"|'[^']*'|[^)]*)\)/g
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const re2 = /@import "(.*?)"/g
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function cssUrlsIndex(css: string): Array<[number, number]> {
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const idxs: Array<[number, number]> = [];
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const i1 = css.matchAll(re1);
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// @ts-ignore
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for (let m of i1) {
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// @ts-ignore
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const s: number = m.index + m[0].indexOf(m[1]);
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const e: number = s + m[1].length;
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idxs.push([s, e]);
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}
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const i2 = css.matchAll(re2);
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// @ts-ignore
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for (let m of i2) {
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// @ts-ignore
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const s = m.index + m[0].indexOf(m[1]);
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const e = s + m[1].length;
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idxs.push([s, e])
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}
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return idxs.reverse()
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}
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function unquote(str: string): [string, string] {
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if (str.length <= 2) {
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return [str, ""]
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}
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if (str[0] == '"' && str[str.length-1] == '"') {
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return [ str.substring(1, str.length-1), "\""];
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}
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if (str[0] == '\'' && str[str.length-1] == '\'') {
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return [ str.substring(1, str.length-1), "'" ];
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}
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return [str, ""]
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}
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function rewriteCSSLinks(css: string, rewriter: (rawurl: string) => string): string {
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for (let idx of cssUrlsIndex(css)) {
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const f = idx[0]
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const t = idx[1]
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const [ rawurl, q ] = unquote(css.substring(f, t));
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css = css.substring(0,f) + q + rewriter(rawurl) + q + css.substring(t);
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}
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return css
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}
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export function resolveCSS(baseURL: string, css: string): string {
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return rewriteCSSLinks(css, rawurl => resolveURL(baseURL, rawurl));
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} |