DOM + DocumentUtil merge (#727)

* Add DOM functions to DocumentUtil

* Use DocumentUtil instead of DOM

* Remove DOM

* Move document-util.js into mixed

4 files changed, 6 insertions, 389 deletions

diff --git a/ext/fg/float.html b/ext/fg/float.html
index 51aa2350..bd2508e6 100644
--- a/ext/fg/float.html
+++ b/ext/fg/float.html
@@ -47,11 +47,10 @@
         <script src="/mixed/js/core.js"></script>
         <script src="/mixed/js/yomichan.js"></script>
         <script src="/mixed/js/comm.js"></script>
-        <script src="/mixed/js/dom.js"></script>
         <script src="/mixed/js/api.js"></script>
         <script src="/mixed/js/japanese.js"></script>
 
-        <script src="/fg/js/document-util.js"></script>
+        <script src="/mixed/js/document-util.js"></script>
         <script src="/fg/js/dom-text-scanner.js"></script>
         <script src="/fg/js/source.js"></script>
         <script src="/mixed/js/audio-system.js"></script>
diff --git a/ext/fg/js/document-util.js b/ext/fg/js/document-util.js
deleted file mode 100644
index d3bba30f..00000000
--- a/ext/fg/js/document-util.js
+++ /dev/null
@@ -1,381 +0,0 @@
-/*
- * Copyright (C) 2016-2020  Yomichan Authors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-/* global
- * DOM
- * DOMTextScanner
- * TextSourceElement
- * TextSourceRange
- */
-
-class DocumentUtil {
-    constructor() {
-        this._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
-    }
-
-    getRangeFromPoint(x, y, deepContentScan) {
-        const elements = this._getElementsFromPoint(x, y, deepContentScan);
-        let imposter = null;
-        let imposterContainer = null;
-        let imposterSourceElement = null;
-        if (elements.length > 0) {
-            const element = elements[0];
-            switch (element.nodeName.toUpperCase()) {
-                case 'IMG':
-                case 'BUTTON':
-                    return new TextSourceElement(element);
-                case 'INPUT':
-                    imposterSourceElement = element;
-                    [imposter, imposterContainer] = this._createImposter(element, false);
-                    break;
-                case 'TEXTAREA':
-                    imposterSourceElement = element;
-                    [imposter, imposterContainer] = this._createImposter(element, true);
-                    break;
-            }
-        }
-
-        const range = this._caretRangeFromPointExt(x, y, deepContentScan ? elements : []);
-        if (range !== null) {
-            if (imposter !== null) {
-                this._setImposterStyle(imposterContainer.style, 'z-index', '-2147483646');
-                this._setImposterStyle(imposter.style, 'pointer-events', 'none');
-            }
-            return new TextSourceRange(range, '', imposterContainer, imposterSourceElement);
-        } else {
-            if (imposterContainer !== null) {
-                imposterContainer.parentNode.removeChild(imposterContainer);
-            }
-            return null;
-        }
-    }
-
-    extractSentence(source, extent, layoutAwareScan) {
-        const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
-        const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
-        const terminators = '…。．.？?！!';
-
-        const sourceLocal = source.clone();
-        const position = sourceLocal.setStartOffset(extent, layoutAwareScan);
-        sourceLocal.setEndOffset(extent * 2 - position, layoutAwareScan, true);
-        const content = sourceLocal.text();
-
-        let quoteStack = [];
-
-        let startPos = 0;
-        for (let i = position; i >= startPos; --i) {
-            const c = content[i];
-
-            if (c === '\n') {
-                startPos = i + 1;
-                break;
-            }
-
-            if (quoteStack.length === 0 && (terminators.includes(c) || c in quotesFwd)) {
-                startPos = i + 1;
-                break;
-            }
-
-            if (quoteStack.length > 0 && c === quoteStack[0]) {
-                quoteStack.pop();
-            } else if (c in quotesBwd) {
-                quoteStack.unshift(quotesBwd[c]);
-            }
-        }
-
-        quoteStack = [];
-
-        let endPos = content.length;
-        for (let i = position; i <= endPos; ++i) {
-            const c = content[i];
-
-            if (c === '\n') {
-                endPos = i + 1;
-                break;
-            }
-
-            if (quoteStack.length === 0) {
-                if (terminators.includes(c)) {
-                    endPos = i + 1;
-                    break;
-                } else if (c in quotesBwd) {
-                    endPos = i;
-                    break;
-                }
-            }
-
-            if (quoteStack.length > 0 && c === quoteStack[0]) {
-                quoteStack.pop();
-            } else if (c in quotesFwd) {
-                quoteStack.unshift(quotesFwd[c]);
-            }
-        }
-
-        const text = content.substring(startPos, endPos);
-        const padding = text.length - text.replace(/^\s+/, '').length;
-
-        return {
-            text: text.trim(),
-            offset: position - startPos - padding
-        };
-    }
-
-    // Private
-
-    _setImposterStyle(style, propertyName, value) {
-        style.setProperty(propertyName, value, 'important');
-    }
-
-    _createImposter(element, isTextarea) {
-        const body = document.body;
-        if (body === null) { return [null, null]; }
-
-        const elementStyle = window.getComputedStyle(element);
-        const elementRect = element.getBoundingClientRect();
-        const documentRect = document.documentElement.getBoundingClientRect();
-        let left = elementRect.left - documentRect.left;
-        let top = elementRect.top - documentRect.top;
-
-        // Container
-        const container = document.createElement('div');
-        const containerStyle = container.style;
-        this._setImposterStyle(containerStyle, 'all', 'initial');
-        this._setImposterStyle(containerStyle, 'position', 'absolute');
-        this._setImposterStyle(containerStyle, 'left', '0');
-        this._setImposterStyle(containerStyle, 'top', '0');
-        this._setImposterStyle(containerStyle, 'width', `${documentRect.width}px`);
-        this._setImposterStyle(containerStyle, 'height', `${documentRect.height}px`);
-        this._setImposterStyle(containerStyle, 'overflow', 'hidden');
-        this._setImposterStyle(containerStyle, 'opacity', '0');
-        this._setImposterStyle(containerStyle, 'pointer-events', 'none');
-        this._setImposterStyle(containerStyle, 'z-index', '2147483646');
-
-        // Imposter
-        const imposter = document.createElement('div');
-        const imposterStyle = imposter.style;
-
-        let value = element.value;
-        if (value.endsWith('\n')) { value += '\n'; }
-        imposter.textContent = value;
-
-        for (let i = 0, ii = elementStyle.length; i < ii; ++i) {
-            const property = elementStyle[i];
-            this._setImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property));
-        }
-        this._setImposterStyle(imposterStyle, 'position', 'absolute');
-        this._setImposterStyle(imposterStyle, 'top', `${top}px`);
-        this._setImposterStyle(imposterStyle, 'left', `${left}px`);
-        this._setImposterStyle(imposterStyle, 'margin', '0');
-        this._setImposterStyle(imposterStyle, 'pointer-events', 'auto');
-
-        if (isTextarea) {
-            if (elementStyle.overflow === 'visible') {
-                this._setImposterStyle(imposterStyle, 'overflow', 'auto');
-            }
-        } else {
-            this._setImposterStyle(imposterStyle, 'overflow', 'hidden');
-            this._setImposterStyle(imposterStyle, 'white-space', 'nowrap');
-            this._setImposterStyle(imposterStyle, 'line-height', elementStyle.height);
-        }
-
-        container.appendChild(imposter);
-        body.appendChild(container);
-
-        // Adjust size
-        const imposterRect = imposter.getBoundingClientRect();
-        if (imposterRect.width !== elementRect.width || imposterRect.height !== elementRect.height) {
-            const width = parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width);
-            const height = parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height);
-            this._setImposterStyle(imposterStyle, 'width', `${width}px`);
-            this._setImposterStyle(imposterStyle, 'height', `${height}px`);
-        }
-        if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) {
-            left += (elementRect.left - imposterRect.left);
-            top += (elementRect.top - imposterRect.top);
-            this._setImposterStyle(imposterStyle, 'left', `${left}px`);
-            this._setImposterStyle(imposterStyle, 'top', `${top}px`);
-        }
-
-        imposter.scrollTop = element.scrollTop;
-        imposter.scrollLeft = element.scrollLeft;
-
-        return [imposter, container];
-    }
-
-    _getElementsFromPoint(x, y, all) {
-        if (all) {
-            // document.elementsFromPoint can return duplicates which must be removed.
-            const elements = document.elementsFromPoint(x, y);
-            return elements.filter((e, i) => elements.indexOf(e) === i);
-        }
-
-        const e = document.elementFromPoint(x, y);
-        return e !== null ? [e] : [];
-    }
-
-    _isPointInRange(x, y, range) {
-        // Require a text node to start
-        if (range.startContainer.nodeType !== Node.TEXT_NODE) {
-            return false;
-        }
-
-        // Scan forward
-        const nodePre = range.endContainer;
-        const offsetPre = range.endOffset;
-        try {
-            const {node, offset, content} = new DOMTextScanner(range.endContainer, range.endOffset, true, false).seek(1);
-            range.setEnd(node, offset);
-
-            if (!this._isWhitespace(content) && DOM.isPointInAnyRect(x, y, range.getClientRects())) {
-                return true;
-            }
-        } finally {
-            range.setEnd(nodePre, offsetPre);
-        }
-
-        // Scan backward
-        const {node, offset, content} = new DOMTextScanner(range.startContainer, range.startOffset, true, false).seek(-1);
-        range.setStart(node, offset);
-
-        if (!this._isWhitespace(content) && DOM.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;
-        }
-
-        // No match
-        return false;
-    }
-
-    _isWhitespace(string) {
-        return string.trim().length === 0;
-    }
-
-    _caretRangeFromPoint(x, y) {
-        if (typeof document.caretRangeFromPoint === 'function') {
-            // Chrome, Edge
-            return document.caretRangeFromPoint(x, y);
-        }
-
-        if (typeof document.caretPositionFromPoint === 'function') {
-            // Firefox
-            return this._caretPositionFromPoint(x, y);
-        }
-
-        // No support
-        return null;
-    }
-
-    _caretPositionFromPoint(x, y) {
-        const position = document.caretPositionFromPoint(x, y);
-        if (position === null) {
-            return null;
-        }
-        const node = position.offsetNode;
-        if (node === null) {
-            return null;
-        }
-
-        const range = document.createRange();
-        const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0);
-        try {
-            range.setStart(node, offset);
-            range.setEnd(node, offset);
-        } catch (e) {
-            // Firefox throws new DOMException("The operation is insecure.")
-            // when trying to select a node from within a ShadowRoot.
-            return null;
-        }
-        return range;
-    }
-
-    _caretRangeFromPointExt(x, y, elements) {
-        const modifications = [];
-        try {
-            let i = 0;
-            let startContinerPre = null;
-            while (true) {
-                const range = this._caretRangeFromPoint(x, y);
-                if (range === null) {
-                    return null;
-                }
-
-                const startContainer = range.startContainer;
-                if (startContinerPre !== startContainer) {
-                    if (this._isPointInRange(x, y, range)) {
-                        return range;
-                    }
-                    startContinerPre = startContainer;
-                }
-
-                i = this._disableTransparentElement(elements, i, modifications);
-                if (i < 0) {
-                    return null;
-                }
-            }
-        } finally {
-            if (modifications.length > 0) {
-                this._restoreElementStyleModifications(modifications);
-            }
-        }
-    }
-
-    _disableTransparentElement(elements, i, modifications) {
-        while (true) {
-            if (i >= elements.length) {
-                return -1;
-            }
-
-            const element = elements[i++];
-            if (this._isElementTransparent(element)) {
-                const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
-                modifications.push({element, style});
-                element.style.setProperty('pointer-events', 'none', 'important');
-                return i;
-            }
-        }
-    }
-
-    _restoreElementStyleModifications(modifications) {
-        for (const {element, style} of modifications) {
-            if (style === null) {
-                element.removeAttribute('style');
-            } else {
-                element.setAttribute('style', style);
-            }
-        }
-    }
-
-    _isElementTransparent(element) {
-        if (
-            element === document.body ||
-            element === document.documentElement
-        ) {
-            return false;
-        }
-        const style = window.getComputedStyle(element);
-        return (
-            parseFloat(style.opacity) <= 0 ||
-            style.visibility === 'hidden' ||
-            (style.backgroundImage === 'none' && this._isColorTransparent(style.backgroundColor))
-        );
-    }
-
-    _isColorTransparent(cssColor) {
-        return this._transparentColorPattern.test(cssColor);
-    }
-}
diff --git a/ext/fg/js/frontend.js b/ext/fg/js/frontend.js
index ccffbab6..0c18fb2a 100644
--- a/ext/fg/js/frontend.js
+++ b/ext/fg/js/frontend.js
@@ -16,7 +16,6 @@
  */
 
 /* global
- * DOM
  * DocumentUtil
  * FrameOffsetForwarder
  * PopupProxy
@@ -98,7 +97,7 @@ class Frontend {
         this._textScanner.prepare();
 
         window.addEventListener('resize', this._onResize.bind(this), false);
-        DOM.addFullscreenChangeEventListener(this._updatePopup.bind(this));
+        DocumentUtil.addFullscreenChangeEventListener(this._updatePopup.bind(this));
 
         const visualViewport = window.visualViewport;
         if (visualViewport !== null && typeof visualViewport === 'object') {
@@ -274,7 +273,7 @@ class Frontend {
         if (
             isIframe &&
             showIframePopupsInRootFrame &&
-            DOM.getFullscreenElement() === null &&
+            DocumentUtil.getFullscreenElement() === null &&
             this._allowRootFramePopupProxy
         ) {
             popupPromise = this._popupCache.get('iframe');
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index 22672706..8ea1afd0 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -16,7 +16,7 @@
  */
 
 /* global
- * DOM
+ * DocumentUtil
  * FrameClient
  * api
  * dynamicLoader
@@ -349,7 +349,7 @@ class Popup {
             return;
         }
 
-        DOM.addFullscreenChangeEventListener(this._onFullscreenChanged.bind(this), this._fullscreenEventListeners);
+        DocumentUtil.addFullscreenChangeEventListener(this._onFullscreenChanged.bind(this), this._fullscreenEventListeners);
     }
 
     _onFullscreenChanged() {
@@ -475,7 +475,7 @@ class Popup {
 
     _getFrameParentElement() {
         const defaultParent = document.body;
-        const fullscreenElement = DOM.getFullscreenElement();
+        const fullscreenElement = DocumentUtil.getFullscreenElement();
         if (
             fullscreenElement === null ||
             fullscreenElement.shadowRoot ||