1 files changed, 119 insertions, 0 deletions
diff --git a/core/misc/machine-name.js b/core/misc/machine-name.js
new file mode 100644
index 00000000000..2691c3b73a2
--- /dev/null
+++ b/core/misc/machine-name.js
@@ -0,0 +1,119 @@
+(function ($) {
+
+/**
+ * Attach the machine-readable name form element behavior.
+ */
+Drupal.behaviors.machineName = {
+  /**
+   * Attaches the behavior.
+   *
+   * @param settings.machineName
+   *   A list of elements to process, keyed by the HTML ID of the form element
+   *   containing the human-readable value. Each element is an object defining
+   *   the following properties:
+   *   - target: The HTML ID of the machine name form element.
+   *   - suffix: The HTML ID of a container to show the machine name preview in
+   *     (usually a field suffix after the human-readable name form element).
+   *   - label: The label to show for the machine name preview.
+   *   - replace_pattern: A regular expression (without modifiers) matching
+   *     disallowed characters in the machine name; e.g., '[^a-z0-9]+'.
+   *   - replace: A character to replace disallowed characters with; e.g., '_'
+   *     or '-'.
+   */
+  attach: function (context, settings) {
+    var self = this;
+    $.each(settings.machineName, function (source_id, options) {
+      var $source = $(source_id, context).addClass('machine-name-source');
+      var $target = $(options.target, context).addClass('machine-name-target');
+      var $suffix = $(options.suffix, context);
+      var $wrapper = $target.parents('.form-item:first');
+      // All elements have to exist.
+      if (!$source.length || !$target.length || !$suffix.length || !$wrapper.length) {
+        return;
+      }
+      // Skip processing upon a form validation error on the machine name.
+      if ($target.hasClass('error')) {
+        return;
+      }
+      // Figure out the maximum length for the machine name.
+      options.maxlength = $target.attr('maxlength');
+      // Hide the form item container of the machine name form element.
+      $wrapper.hide();
+      // Determine the initial machine name value. Unless the machine name form
+      // element is disabled or not empty, the initial default value is based on
+      // the human-readable form element value.
+      if ($target.is(':disabled') || $target.val() != '') {
+        var machine = $target.val();
+      }
+      else {
+        var machine = self.transliterate($source.val(), options);
+      }
+      // Append the machine name preview to the source field.
+      var $preview = $('<span class="machine-name-value">' + machine + '</span>');
+      $suffix.empty()
+        .append(' ').append('<span class="machine-name-label">' + options.label + ':</span>')
+        .append(' ').append($preview);
+
+      // If the machine name cannot be edited, stop further processing.
+      if ($target.is(':disabled')) {
+        return;
+      }
+
+      // If it is editable, append an edit link.
+      var $link = $('<span class="admin-link"><a href="#">' + Drupal.t('Edit') + '</a></span>')
+        .click(function () {
+          $wrapper.show();
+          $target.focus();
+          $suffix.hide();
+          $source.unbind('.machineName');
+          return false;
+        });
+      $suffix.append(' ').append($link);
+
+      // Preview the machine name in realtime when the human-readable name
+      // changes, but only if there is no machine name yet; i.e., only upon
+      // initial creation, not when editing.
+      if ($target.val() == '') {
+        $source.bind('keyup.machineName change.machineName', function () {
+          machine = self.transliterate($(this).val(), options);
+          // Set the machine name to the transliterated value.
+          if (machine != options.replace && machine != '') {
+            $target.val(machine);
+            $preview.text(machine);
+            $suffix.show();
+          }
+          else {
+            $suffix.hide();
+            $target.val(machine);
+            $preview.empty();
+          }
+        });
+        // Initialize machine name preview.
+        $source.keyup();
+      }
+    });
+  },
+
+  /**
+   * Transliterate a human-readable name to a machine name.
+   *
+   * @param source
+   *   A string to transliterate.
+   * @param settings
+   *   The machine name settings for the corresponding field, containing:
+   *   - replace_pattern: A regular expression (without modifiers) matching
+   *     disallowed characters in the machine name; e.g., '[^a-z0-9]+'.
+   *   - replace: A character to replace disallowed characters with; e.g., '_'
+   *     or '-'.
+   *   - maxlength: The maximum length of the machine name.
+   *
+   * @return
+   *   The transliterated source string.
+   */
+  transliterate: function (source, settings) {
+    var rx = new RegExp(settings.replace_pattern, 'g');
+    return source.toLowerCase().replace(rx, settings.replace).substr(0, settings.maxlength);
+  }
+};
+
+})(jQuery);