Slugger.js•1.36 kB
/**
* Slugger generates header id
*/
export class Slugger {
constructor() {
this.seen = {};
}
/**
* @param {string} value
*/
serialize(value) {
return value
.toLowerCase()
.trim()
// remove html tags
.replace(/<[!\/a-z].*?>/ig, '')
// remove unwanted chars
.replace(/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g, '')
.replace(/\s/g, '-');
}
/**
* Finds the next safe (unique) slug to use
* @param {string} originalSlug
* @param {boolean} isDryRun
*/
getNextSafeSlug(originalSlug, isDryRun) {
let slug = originalSlug;
let occurenceAccumulator = 0;
if (this.seen.hasOwnProperty(slug)) {
occurenceAccumulator = this.seen[originalSlug];
do {
occurenceAccumulator++;
slug = originalSlug + '-' + occurenceAccumulator;
} while (this.seen.hasOwnProperty(slug));
}
if (!isDryRun) {
this.seen[originalSlug] = occurenceAccumulator;
this.seen[slug] = 0;
}
return slug;
}
/**
* Convert string to unique id
* @param {object} [options]
* @param {boolean} [options.dryrun] Generates the next unique slug without
* updating the internal accumulator.
*/
slug(value, options = {}) {
const slug = this.serialize(value);
return this.getNextSafeSlug(slug, options.dryrun);
}
}