1 files changed, 55 insertions, 0 deletions
diff --git a/node_modules/marked/src/Slugger.js b/node_modules/marked/src/Slugger.js
new file mode 100644
index 0000000..a0b68f5
--- /dev/null
+++ b/node_modules/marked/src/Slugger.js
@@ -0,0 +1,55 @@
+/**
+ * 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);
+  }
+}