1 files changed, 135 insertions, 0 deletions
diff --git a/devtools/client/inspector/markup/utils.js b/devtools/client/inspector/markup/utils.js
new file mode 100644
index 000000000..8fab9d963
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+++ b/devtools/client/inspector/markup/utils.js
@@ -0,0 +1,135 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Apply a 'flashed' background and foreground color to elements. Intended
+ * to be used with flashElementOff as a way of drawing attention to an element.
+ *
+ * @param  {Node} backgroundElt
+ *         The element to set the highlighted background color on.
+ * @param  {Node} foregroundElt
+ *         The element to set the matching foreground color on.
+ *         Optional.  This will equal backgroundElt if not set.
+ */
+function flashElementOn(backgroundElt, foregroundElt = backgroundElt) {
+  if (!backgroundElt || !foregroundElt) {
+    return;
+  }
+
+  // Make sure the animation class is not here
+  backgroundElt.classList.remove("flash-out");
+
+  // Change the background
+  backgroundElt.classList.add("theme-bg-contrast");
+
+  foregroundElt.classList.add("theme-fg-contrast");
+  [].forEach.call(
+    foregroundElt.querySelectorAll("[class*=theme-fg-color]"),
+    span => span.classList.add("theme-fg-contrast")
+  );
+}
+
+/**
+ * Remove a 'flashed' background and foreground color to elements.
+ * See flashElementOn.
+ *
+ * @param  {Node} backgroundElt
+ *         The element to reomve the highlighted background color on.
+ * @param  {Node} foregroundElt
+ *         The element to remove the matching foreground color on.
+ *         Optional.  This will equal backgroundElt if not set.
+ */
+function flashElementOff(backgroundElt, foregroundElt = backgroundElt) {
+  if (!backgroundElt || !foregroundElt) {
+    return;
+  }
+
+  // Add the animation class to smoothly remove the background
+  backgroundElt.classList.add("flash-out");
+
+  // Remove the background
+  backgroundElt.classList.remove("theme-bg-contrast");
+
+  foregroundElt.classList.remove("theme-fg-contrast");
+  [].forEach.call(
+    foregroundElt.querySelectorAll("[class*=theme-fg-color]"),
+    span => span.classList.remove("theme-fg-contrast")
+  );
+}
+
+/**
+ * Retrieve the available width between a provided element left edge and a container right
+ * edge. This used can be used as a max-width for inplace-editor (autocomplete) widgets
+ * replacing Editor elements of the the markup-view;
+ */
+function getAutocompleteMaxWidth(element, container) {
+  let elementRect = element.getBoundingClientRect();
+  let containerRect = container.getBoundingClientRect();
+  return containerRect.right - elementRect.left - 2;
+}
+
+/**
+ * Parse attribute names and values from a string.
+ *
+ * @param  {String} attr
+ *         The input string for which names/values are to be parsed.
+ * @param  {HTMLDocument} doc
+ *         A document that can be used to test valid attributes.
+ * @return {Array}
+ *         An array of attribute names and their values.
+ */
+function parseAttributeValues(attr, doc) {
+  attr = attr.trim();
+
+  let parseAndGetNode = str => {
+    return new DOMParser().parseFromString(str, "text/html").body.childNodes[0];
+  };
+
+  // Handle bad user inputs by appending a " or ' if it fails to parse without
+  // them. Also note that a SVG tag is used to make sure the HTML parser
+  // preserves mixed-case attributes
+  let el = parseAndGetNode("<svg " + attr + "></svg>") ||
+           parseAndGetNode("<svg " + attr + "\"></svg>") ||
+           parseAndGetNode("<svg " + attr + "'></svg>");
+
+  let div = doc.createElement("div");
+  let attributes = [];
+  for (let {name, value} of el.attributes) {
+    // Try to set on an element in the document, throws exception on bad input.
+    // Prevents InvalidCharacterError - "String contains an invalid character".
+    try {
+      div.setAttribute(name, value);
+      attributes.push({ name, value });
+    } catch (e) {
+      // This may throw exceptions on bad input.
+      // Prevents InvalidCharacterError - "String contains an invalid
+      // character".
+    }
+  }
+
+  return attributes;
+}
+
+/**
+ * Truncate the string and add ellipsis to the middle of the string.
+ */
+function truncateString(str, maxLength) {
+  if (!str || str.length <= maxLength) {
+    return str;
+  }
+
+  return str.substring(0, Math.ceil(maxLength / 2)) +
+         "…" +
+         str.substring(str.length - Math.floor(maxLength / 2));
+}
+
+module.exports = {
+  flashElementOn,
+  flashElementOff,
+  getAutocompleteMaxWidth,
+  parseAttributeValues,
+  truncateString,
+};