zeptomatch-explode/dist/explode_start.js

A little utility for exploding a zeptomatch-flavored glob into its dynamic and static parts.

/* IMPORT */
/* HELPERS */
const SIMPLE_RE = /(\/?)([ a-zA-Z0-9._-]*)(?:\{([ a-zA-Z0-9._-]+(?:,[ a-zA-Z0-9._-]+)*)\})?([ a-zA-Z0-9._-]*)(\/(?=.))/gsy;
/* MAIN */
//TODO: Account for more things, like classes, ranges, escapes, optionals, etc.
const explodeStart = (glob) => {
    let index = 0;
    let length = glob.length;
    let statics = [];
    while (index < length) {
        SIMPLE_RE.lastIndex = index;
        const match = SIMPLE_RE.exec(glob);
        if (!match)
            break;
        const [_, slash, prefix, multiple, suffix] = match;
        if (!prefix && !multiple && !suffix)
            break;
        const values = multiple ? multiple.split(',').map(value => `${slash}${prefix}${value}${suffix}`) : [`${slash}${prefix}${suffix}`];
        statics = statics.length ? statics.flatMap(prefix => values.map(value => `${prefix}/${value}`)) : values;
        index = SIMPLE_RE.lastIndex;
    }
    const dynamic = index ? glob.slice(index) : glob;
    return { statics, dynamic };
};
/* EXPORT */
export default explodeStart;