Remove dependency on Footnotes module.

bibcite_footnotes.info.yml

@@ -7,4 +7,6 @@ dependencies:
   - bibcite:bibcite
   - bibcite:bibcite_entity
   - entity_reference
-  - footnotes:footnotes
+  - fakeobjects:fakeobjects
+
+

composer.json

@@ -0,0 +1,23 @@
+{
+    "name": "drupal/bibcite_footnotes",
+    "description": "Add citation footnotes with automatic numbering.",
+    "type": "drupal-module",
+    "homepage": "https://drupal.org/project/bibcite_footnotes",
+    "authors": [
+        {
+            "name": "Alexander O'Neill (alxp)",
+            "homepage": "https://www.drupal.org/u/alxp",
+            "role": "Maintainer"
+        }
+    ],
+    "support": {
+        "issues": "https://drupal.org/project/issues/bibcite_footnotes",
+        "source": "https://cgit.drupalcode.org/bibcite_footnotes"
+    },
+    "license": "GPL-2.0+",
+    "minimum-stability": "dev",
+    "require": {
+        "drupal/core": ">=8.6",
+        "drupal/fakeobjects": "^1.0"
+    }
+}

css/reference_footnote.css

@@ -8,3 +8,88 @@
   content: " ";
   white-space: pre;
 }
+
+/*
+ * CSS specific to Bibcite Footnotes module.
+ * (Borrowed from Footnotes module.
+ *
+*
+* Thanks to binford2k@lug.wsu.edu for this tip and drinkypoo
+* for the question leading up to it. http://drupal.org/node/80538
+*/
+
+/* Add empty space before footnotes and a black line on top. */
+.footnotes {
+  clear: both;
+  margin-top: 4em;
+  margin-bottom: 2em;
+  border-top: 1px solid #000;
+}
+/* Make footnotes appear in a smaller font */
+.footnotes {
+  font-size: 0.9em;
+}
+/*
+  Make the footnote a supertext^1
+*/
+.see-footnote {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.9em;
+}
+/* Hide the bullet of the UL list of footnotes */
+
+ul.footnotes {
+  list-style-type: none;
+  margin-left: 0;
+  padding-left: 0;
+}
+ul.footnotes li {
+  margin-left: 2.5em;
+  list-style-type: none;
+  background: none; /* Garland theme sets a bullet via background image, this must be unset! See bug 861634 */
+}
+/* Move the footnote number outside of the margin for footnote text (hanging indent) */
+ul.footnotes {
+  /* This is apparently very needed for the "position: absolute;" below to work correctly */
+  position: relative;
+}
+.footnotes .footnote-label {
+  position: absolute;
+  left: 0;
+  z-index: 2;
+}
+/* Highlight the target footnote (or ref number, if a backlink was used) when user clicks a footnote. */
+.see-footnote:target,
+.footnotes .footnote:target {
+  background-color: #eee;
+}
+.see-footnote:target {
+  border: solid 1px #aaa;
+}
+/* Note: This CSS has a minor bug on all versions of IE in that the footnote numbers
+are aligned with the absolute bottom of their space, thus being a couple of pixels
+lower than their corresponding line of text. IE5.5 has a serious bug in that the numbers
+are not shifted left at all, thus being garbled together with the start of their text. */
+
+/*
+  Make the multiple backlinks a supertext^1
+*/
+.footnotes .footnote-multi {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.75em;
+}
+/*
+ * Textile Footnotes
+ */
+/* First footnote */
+#fn1 {
+  border-top: 1px solid #000;
+  margin-top: 3em;
+}
+.footnote {
+  font-size: 0.9em;
+}

src/Plugin/Filter/ReferenceFootnotesFilter.php

@@ -4,7 +4,9 @@ namespace Drupal\bibcite_footnotes\Plugin\Filter;
 
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\footnotes\Plugin\Filter\FootnotesFilter;
+use Drupal\filter\FilterProcessResult;
+use Drupal\filter\Plugin\FilterBase;
+
 
 /**
  * Reference Footnotes filter.
@@ -24,7 +26,7 @@ use Drupal\footnotes\Plugin\Filter\FootnotesFilter;
  *   weight = 0
  * )
  */
-class ReferenceFootnotesFilter extends FootnotesFilter {
+class ReferenceFootnotesFilter extends FilterBase {
 
   /**
    * Object with configuration for reference footnotes.
@@ -46,6 +48,7 @@ class ReferenceFootnotesFilter extends FootnotesFilter {
   public function __construct(array $configuration, $plugin_id, array $plugin_definition) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
 
+    $this->renderer = \Drupal::service('renderer');
     $this->config = \Drupal::config('reference_footnotes.settings');
     $this->configEditable = \Drupal::configFactory()
       ->getEditable('reference_footnotes.settings');
@@ -310,4 +313,89 @@ class ReferenceFootnotesFilter extends FootnotesFilter {
       $prev_reference_id = $fn['reference'];
     }
   }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function process($text, $langcode) {
+    // Supporting both [fn] and <fn> now. Thanks to fletchgqc
+    // http://drupal.org/node/268026.
+    // Convert all square brackets to angle brackets. This way all further code
+    // just manipulates angle brackets. (Angle brackets are preferred here for
+    // the simple reason that square brackets are more tedious to use in
+    // regexps).
+    if (is_array($text)) {
+      implode($text);
+    }
+    $text = preg_replace('|\[fn([^\]]*)\]|', '<fn$1>', $text);
+    $text = preg_replace('|\[/fn\]|', '</fn>', $text);
+    $text = preg_replace('|\[footnotes([^\]]*)\]|', '<footnotes$1>', $text);
+
+    // Check that there are an even number of open and closing tags.
+    // If there is one closing tag missing, append this to the end.
+    // If there is more disparity, throw a warning and continue.
+    // A closing tag may sometimes be missing when we are processing a teaser
+    // and it has been cut in the middle of the footnote.
+    // See http://drupal.org/node/253326
+    $foo = [];
+    $open_tags = preg_match_all("|<fn([^>]*)>|", $text, $foo);
+    $close_tags = preg_match_all("|</fn>|", $text, $foo);
+
+    if ($open_tags == $close_tags + 1) {
+      $text = $text . '</fn>';
+    }
+    elseif ($open_tags > $close_tags + 1) {
+      trigger_error($this->t("You have unclosed fn tags. This is invalid and will
+        produce unpredictable results."));
+    }
+
+    // Before doing the replacement, the callback function needs to know which
+    // options to use.
+    $this->replaceCallback($this->settings, 'prepare');
+
+    $pattern = '|<fn([^>]*)>(.*?)</fn>|s';
+    $text = preg_replace_callback($pattern, [
+      $this,
+      'replaceCallback',
+    ], $text);
+
+    // Replace tag <footnotes> with the list of footnotes.
+    // If tag is not present, by default add the footnotes at the end.
+    // Thanks to acp on drupal.org for this idea. see
+    // http://drupal.org/node/87226.
+    $footer = $this->replaceCallback(NULL, 'output footer');
+    $pattern = '|(<footnotes([^\]]*)>)|';
+    if (preg_match($pattern, $text) > 0) {
+      $text = preg_replace($pattern, $footer, $text, 1);
+    }
+    elseif (!empty($footer)) {
+      $text .= "\n\n" . $footer;
+    }
+    $result = new FilterProcessResult($text);
+    $result->setAttachments([
+      'library' => [
+        'footnotes/footnotes',
+      ],
+    ]);
+    return $result;
+  }
+
+
+  /**
+   * Helper function to return a random text string.
+   *
+   * @return string
+   *   Random (lowercase) alphanumeric string.
+   */
+  public function randstr() {
+    $chars = "abcdefghijklmnopqrstuwxyz1234567890";
+    $str = "";
+
+    // Seeding with srand() not necessary in modern PHP versions.
+    for ($i = 0; $i < 7; $i++) {
+      $n = rand(0, strlen($chars) - 1);
+      $str .= substr($chars, $n, 1);
+    }
+    return $str;
+  }
 }