Moving to new file. Namespacing and PHPCS cleanup.

Author: ronaldhuereca

simpletoc-class-headline-ids.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * Class to manage headline IDs.
+ *
+ * Ensures a unique anchor for each headline.
+ *
+ * @package simpletoc
+ */
+
+namespace MToensing\SimpleTOC;
+
+/**
+ * Class to manage headline IDs.
+ *
+ * Ensures a unique anchor for each headline.
+ */
+class SimpleTOC_Headline_Ids {
+	/**
+	 * Array of headlines and their counts.
+	 *
+	 * @var array
+	 */
+	private $headlines = array();
+
+	/**
+	 * Add a headline to the array
+	 *
+	 * @param string $headline_slug The slug of the headline.
+	 */
+	private function add_headline( $headline_slug ) {
+		if ( empty( $headline_slug ) ) {
+			return;
+		}
+
+		if ( ! isset( $this->headlines[ $headline_slug ] ) ) {
+			$this->headlines[ $headline_slug ] = 1;
+		} else {
+			$this->headlines[ $headline_slug ] = $this->get_headline_count( $headline_slug ) + 1;
+		}
+		if ( $this->headlines[ $headline_slug ] > 1 ) {
+			$new_headline_slug = $headline_slug . '-' . $this->headlines[ $headline_slug ];
+			if ( isset( $this->headlines[ $new_headline_slug ] ) ) {
+				$new_headline_slug = $this->add_headline( $new_headline_slug );
+			}
+			$new_headline_count = $this->get_headline_count( $new_headline_slug );
+			if ( 0 === $new_headline_count ) {
+				$new_headline_count = 1;
+			}
+			$this->headlines[ $new_headline_slug ] = $new_headline_count;
+			return $new_headline_slug;
+		}
+		return $headline_slug;
+	}
+
+	/**
+	 * Get the anchor for a headline
+	 *
+	 * @param string $headline The headline.
+	 * @return string The anchor for the headline
+	 */
+	public function get_headline_anchor( $headline ) {
+		if ( empty( $headline ) ) {
+			return '';
+		}
+
+		$headline_slug = simpletoc_sanitize_string( $headline );
+
+		$headline_slug = $this->add_headline( $headline_slug );
+		return $headline_slug;
+	}
+
+	/**
+	 * Get the count of a headline slug.
+	 *
+	 * @param string $headline_slug The slug of the headline.
+	 * @return mixed The count of the headline slug.
+	 */
+	private function get_headline_count( $headline_slug = '' ) {
+		return $this->headlines[ $headline_slug ] ?? 0;
+	}
+}