DocumentUtil static (#2232)

* Make all methods static

The two non-static methods are kept for temporary compatibility

* Use this instead of class name now that functions are static

* Update test

* Don't instantiate DocumentUtil

* Remove temporary non-static methods

* Remove unused global declaration

5 files changed, 26 insertions, 38 deletions

diff --git a/ext/js/app/frontend.js b/ext/js/app/frontend.js
index de3eb7fd..4f704faf 100644
--- a/ext/js/app/frontend.js
+++ b/ext/js/app/frontend.js
@@ -73,13 +73,11 @@ class Frontend {
         this._pageZoomFactor = 1.0;
         this._contentScale = 1.0;
         this._lastShowPromise = Promise.resolve();
-        this._documentUtil = new DocumentUtil();
         this._textScanner = new TextScanner({
             node: window,
             ignoreElements: this._ignoreElements.bind(this),
             ignorePoint: this._ignorePoint.bind(this),
             getSearchContext: this._getSearchContext.bind(this),
-            documentUtil: this._documentUtil,
             searchTerms: true,
             searchKanji: true
         });
diff --git a/ext/js/display/display.js b/ext/js/display/display.js
index d286bd5e..21bdc5a4 100644
--- a/ext/js/display/display.js
+++ b/ext/js/display/display.js
@@ -20,7 +20,6 @@
  * DisplayGenerator
  * DisplayHistory
  * DisplayNotification
- * DocumentUtil
  * ElementOverflowController
  * FrameEndpoint
  * Frontend
@@ -121,7 +120,6 @@ class Display extends EventDispatcher {
         this._query = '';
         this._fullQuery = '';
         this._queryOffset = 0;
-        this._documentUtil = new DocumentUtil();
         this._progressIndicator = document.querySelector('#progress-indicator');
         this._progressIndicatorTimer = null;
         this._progressIndicatorVisible = new DynamicProperty(false);
@@ -130,7 +128,6 @@ class Display extends EventDispatcher {
         this._queryParserContainer = document.querySelector('#query-parser-container');
         this._queryParser = new QueryParser({
             getSearchContext: this._getSearchContext.bind(this),
-            documentUtil: this._documentUtil,
             japaneseUtil
         });
         this._contentScrollElement = document.querySelector('#content-scroll');
@@ -1498,7 +1495,6 @@ class Display extends EventDispatcher {
             this._contentTextScanner = new TextScanner({
                 node: window,
                 getSearchContext: this._getSearchContext.bind(this),
-                documentUtil: this._documentUtil,
                 searchTerms: true,
                 searchKanji: false,
                 searchOnClick: true,
diff --git a/ext/js/display/query-parser.js b/ext/js/display/query-parser.js
index cc193a06..bafa9045 100644
--- a/ext/js/display/query-parser.js
+++ b/ext/js/display/query-parser.js
@@ -20,10 +20,9 @@
  */
 
 class QueryParser extends EventDispatcher {
-    constructor({getSearchContext, documentUtil, japaneseUtil}) {
+    constructor({getSearchContext, japaneseUtil}) {
         super();
         this._getSearchContext = getSearchContext;
-        this._documentUtil = documentUtil;
         this._japaneseUtil = japaneseUtil;
         this._text = '';
         this._setTextToken = null;
@@ -39,7 +38,6 @@ class QueryParser extends EventDispatcher {
         this._textScanner = new TextScanner({
             node: this._queryParser,
             getSearchContext,
-            documentUtil,
             searchTerms: true,
             searchKanji: false,
             searchOnClick: true
diff --git a/ext/js/dom/document-util.js b/ext/js/dom/document-util.js
index 41f44afe..53297084 100644
--- a/ext/js/dom/document-util.js
+++ b/ext/js/dom/document-util.js
@@ -22,11 +22,7 @@
  */
 
 class DocumentUtil {
-    constructor() {
-        this._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
-    }
-
-    getRangeFromPoint(x, y, {deepContentScan, normalizeCssZoom}) {
+    static getRangeFromPoint(x, y, {deepContentScan, normalizeCssZoom}) {
         const elements = this._getElementsFromPoint(x, y, deepContentScan);
         let imposter = null;
         let imposterContainer = null;
@@ -90,7 +86,7 @@ class DocumentUtil {
      *   ```
      * @returns {{sentence: string, offset: number}} The sentence and the offset to the original source.
      */
-    extractSentence(source, layoutAwareScan, extent, terminateAtNewlines, terminatorMap, forwardQuoteMap, backwardQuoteMap) {
+    static extractSentence(source, layoutAwareScan, extent, terminateAtNewlines, terminatorMap, forwardQuoteMap, backwardQuoteMap) {
         // Scan text
         source = source.clone();
         const startLength = source.setStartOffset(extent, layoutAwareScan);
@@ -397,11 +393,11 @@ class DocumentUtil {
         }
     }
 
-    _setImposterStyle(style, propertyName, value) {
+    static _setImposterStyle(style, propertyName, value) {
         style.setProperty(propertyName, value, 'important');
     }
 
-    _createImposter(element, isTextarea) {
+    static _createImposter(element, isTextarea) {
         const body = document.body;
         if (body === null) { return [null, null]; }
 
@@ -477,7 +473,7 @@ class DocumentUtil {
         return [imposter, container];
     }
 
-    _getElementsFromPoint(x, y, all) {
+    static _getElementsFromPoint(x, y, all) {
         if (all) {
             // document.elementsFromPoint can return duplicates which must be removed.
             const elements = document.elementsFromPoint(x, y);
@@ -488,7 +484,7 @@ class DocumentUtil {
         return e !== null ? [e] : [];
     }
 
-    _isPointInRange(x, y, range, normalizeCssZoom) {
+    static _isPointInRange(x, y, range, normalizeCssZoom) {
         // Require a text node to start
         const {startContainer} = range;
         if (startContainer.nodeType !== Node.TEXT_NODE) {
@@ -497,7 +493,7 @@ class DocumentUtil {
 
         // Convert CSS zoom coordinates
         if (normalizeCssZoom) {
-            const scale = DocumentUtil.computeZoomScale(startContainer);
+            const scale = this.computeZoomScale(startContainer);
             x /= scale;
             y /= scale;
         }
@@ -509,7 +505,7 @@ class DocumentUtil {
             const {node, offset, content} = new DOMTextScanner(nodePre, offsetPre, true, false).seek(1);
             range.setEnd(node, offset);
 
-            if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) {
+            if (!this._isWhitespace(content) && this.isPointInAnyRect(x, y, range.getClientRects())) {
                 return true;
             }
         } finally {
@@ -520,7 +516,7 @@ class DocumentUtil {
         const {node, offset, content} = new DOMTextScanner(startContainer, range.startOffset, true, false).seek(-1);
         range.setStart(node, offset);
 
-        if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) {
+        if (!this._isWhitespace(content) && this.isPointInAnyRect(x, y, range.getClientRects())) {
             // This purposefully leaves the starting offset as modified and sets the range length to 0.
             range.setEnd(node, offset);
             return true;
@@ -530,11 +526,11 @@ class DocumentUtil {
         return false;
     }
 
-    _isWhitespace(string) {
+    static _isWhitespace(string) {
         return string.trim().length === 0;
     }
 
-    _caretRangeFromPoint(x, y) {
+    static _caretRangeFromPoint(x, y) {
         if (typeof document.caretRangeFromPoint === 'function') {
             // Chrome, Edge
             return document.caretRangeFromPoint(x, y);
@@ -549,7 +545,7 @@ class DocumentUtil {
         return null;
     }
 
-    _caretPositionFromPoint(x, y) {
+    static _caretPositionFromPoint(x, y) {
         const position = document.caretPositionFromPoint(x, y);
         if (position === null) {
             return null;
@@ -586,7 +582,7 @@ class DocumentUtil {
         }
     }
 
-    _caretPositionFromPointNormalizeStyles(x, y, nextElement) {
+    static _caretPositionFromPointNormalizeStyles(x, y, nextElement) {
         const previousStyles = new Map();
         try {
             while (true) {
@@ -638,7 +634,7 @@ class DocumentUtil {
         }
     }
 
-    _caretRangeFromPointExt(x, y, elements, normalizeCssZoom) {
+    static _caretRangeFromPointExt(x, y, elements, normalizeCssZoom) {
         let previousStyles = null;
         try {
             let i = 0;
@@ -670,7 +666,7 @@ class DocumentUtil {
         }
     }
 
-    _disableTransparentElement(elements, i, previousStyles) {
+    static _disableTransparentElement(elements, i, previousStyles) {
         while (true) {
             if (i >= elements.length) {
                 return -1;
@@ -685,13 +681,13 @@ class DocumentUtil {
         }
     }
 
-    _recordPreviousStyle(previousStyles, element) {
+    static _recordPreviousStyle(previousStyles, element) {
         if (previousStyles.has(element)) { return; }
         const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
         previousStyles.set(element, style);
     }
 
-    _revertStyles(previousStyles) {
+    static _revertStyles(previousStyles) {
         for (const [element, style] of previousStyles.entries()) {
             if (style === null) {
                 element.removeAttribute('style');
@@ -701,7 +697,7 @@ class DocumentUtil {
         }
     }
 
-    _isElementTransparent(element) {
+    static _isElementTransparent(element) {
         if (
             element === document.body ||
             element === document.documentElement
@@ -716,13 +712,15 @@ class DocumentUtil {
         );
     }
 
-    _isColorTransparent(cssColor) {
+    static _isColorTransparent(cssColor) {
         return this._transparentColorPattern.test(cssColor);
     }
 
-    _isElementUserSelectAll(element) {
+    static _isElementUserSelectAll(element) {
         return getComputedStyle(element).userSelect === 'all';
     }
 }
 // eslint-disable-next-line no-underscore-dangle
+DocumentUtil._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
+// eslint-disable-next-line no-underscore-dangle
 DocumentUtil._cssZoomSupported = null;
diff --git a/ext/js/language/text-scanner.js b/ext/js/language/text-scanner.js
index 3b8a8b47..a5b35a26 100644
--- a/ext/js/language/text-scanner.js
+++ b/ext/js/language/text-scanner.js
@@ -22,7 +22,6 @@
 class TextScanner extends EventDispatcher {
     constructor({
         node,
-        documentUtil,
         getSearchContext,
         ignoreElements=null,
         ignorePoint=null,
@@ -33,7 +32,6 @@ class TextScanner extends EventDispatcher {
     }) {
         super();
         this._node = node;
-        this._documentUtil = documentUtil;
         this._getSearchContext = getSearchContext;
         this._ignoreElements = ignoreElements;
         this._ignorePoint = ignorePoint;
@@ -878,7 +876,7 @@ class TextScanner extends EventDispatcher {
         if (dictionaryEntries.length === 0) { return null; }
 
         textSource.setEndOffset(originalTextLength, layoutAwareScan, false);
-        const sentence = this._documentUtil.extractSentence(
+        const sentence = DocumentUtil.extractSentence(
             textSource,
             layoutAwareScan,
             sentenceScanExtent,
@@ -905,7 +903,7 @@ class TextScanner extends EventDispatcher {
         if (dictionaryEntries.length === 0) { return null; }
 
         textSource.setEndOffset(1, layoutAwareScan, false);
-        const sentence = this._documentUtil.extractSentence(
+        const sentence = DocumentUtil.extractSentence(
             textSource,
             layoutAwareScan,
             sentenceScanExtent,
@@ -937,7 +935,7 @@ class TextScanner extends EventDispatcher {
                 return;
             }
 
-            const textSource = this._documentUtil.getRangeFromPoint(x, y, {
+            const textSource = DocumentUtil.getRangeFromPoint(x, y, {
                 deepContentScan: this._deepContentScan,
                 normalizeCssZoom: this._normalizeCssZoom
             });