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import type { TransformOptions } from '../loaders/index.js';
import { shorthash } from './shorthash.js';
export function isRemoteImage(src: string) {
return /^(https?:)?\/\//.test(src);
}
function removeQueryString(src: string) {
const index = src.lastIndexOf('?');
return index > 0 ? src.substring(0, index) : src;
}
export function extname(src: string) {
const base = basename(src);
const index = base.lastIndexOf('.');
if (index <= 0) {
return '';
}
return base.substring(index);
}
function removeExtname(src: string) {
const index = src.lastIndexOf('.');
if (index <= 0) {
return src;
}
return src.substring(0, index);
}
function basename(src: string) {
return removeQueryString(src.replace(/^.*[\\\/]/, ''));
}
export function propsToFilename(transform: TransformOptions, serviceEntryPoint: string) {
// strip off the querystring first, then remove the file extension
let filename = removeQueryString(transform.src);
// take everything from transform except alt, which is not used in the hash
const { alt, ...rest } = transform;
const hashFields = { ...rest, serviceEntryPoint };
filename = basename(filename);
const ext = extname(filename);
filename = removeExtname(filename);
const outputExt = transform.format ? `.${transform.format}` : ext;
return `/${filename}_${shorthash(JSON.stringify(hashFields))}${outputExt}`;
}
export function appendForwardSlash(path: string) {
return path.endsWith('/') ? path : path + '/';
}
export function prependForwardSlash(path: string) {
return path[0] === '/' ? path : '/' + path;
}
export function removeTrailingForwardSlash(path: string) {
return path.endsWith('/') ? path.slice(0, path.length - 1) : path;
}
export function removeLeadingForwardSlash(path: string) {
return path.startsWith('/') ? path.substring(1) : path;
}
export function trimSlashes(path: string) {
return path.replace(/^\/|\/$/g, '');
}
function isString(path: unknown): path is string {
return typeof path === 'string' || path instanceof String;
}
export function joinPaths(...paths: (string | undefined)[]) {
return paths
.filter(isString)
.map((path, i) => {
if (i === 0) {
return removeTrailingForwardSlash(path);
} else if (i === paths.length - 1) {
return removeLeadingForwardSlash(path);
} else {
return trimSlashes(path);
}
})
.join('/');
}
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