rvx/dist/es/router/path.js

A signal based rendering library

export function normalize(path, preserveDir = true) {
    if (path === "/" || path === "") {
        return "";
    }
    if (!preserveDir && path.endsWith("/")) {
        path = path.slice(0, path.length - 1);
    }
    if (path.startsWith("/")) {
        return path;
    }
    return "/" + path;
}
export function join(parent, child, preserveDir = true) {
    child = normalize(child, preserveDir);
    parent = normalize(parent, child === "" ? preserveDir : false);
    return parent + child;
}
export function relative(from, to, preserveDir = true) {
    const base = normalize(from, false);
    to = normalize(to, preserveDir);
    if (base.length === 0) {
        return to;
    }
    let basePos = 0;
    for (;;) {
        const sep = base.indexOf("/", basePos + 1);
        const end = sep < 0 ? base.length : sep;
        const part = base.slice(basePos, end);
        if (to === part || (to.startsWith(part, basePos) && to[basePos + part.length] === "/")) {
            basePos = end;
        }
        else {
            break;
        }
        if (sep < 0) {
            break;
        }
    }
    let back = 0;
    for (let i = basePos; i < base.length; i++) {
        if (base[i] === "/") {
            back++;
        }
    }
    to = to.slice(basePos);
    if (back === 0 && to === "/") {
        return "";
    }
    return "/..".repeat(back) + to;
}
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