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-rw-r--r--ext/fg/js/document.js374
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diff --git a/ext/fg/js/document.js b/ext/fg/js/document.js
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--- a/ext/fg/js/document.js
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-/*
- * 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
- */
-
-const REGEX_TRANSPARENT_COLOR = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
-
-function docSetImposterStyle(style, propertyName, value) {
- style.setProperty(propertyName, value, 'important');
-}
-
-function docImposterCreate(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;
- docSetImposterStyle(containerStyle, 'all', 'initial');
- docSetImposterStyle(containerStyle, 'position', 'absolute');
- docSetImposterStyle(containerStyle, 'left', '0');
- docSetImposterStyle(containerStyle, 'top', '0');
- docSetImposterStyle(containerStyle, 'width', `${documentRect.width}px`);
- docSetImposterStyle(containerStyle, 'height', `${documentRect.height}px`);
- docSetImposterStyle(containerStyle, 'overflow', 'hidden');
- docSetImposterStyle(containerStyle, 'opacity', '0');
-
- docSetImposterStyle(containerStyle, 'pointer-events', 'none');
- docSetImposterStyle(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];
- docSetImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property));
- }
- docSetImposterStyle(imposterStyle, 'position', 'absolute');
- docSetImposterStyle(imposterStyle, 'top', `${top}px`);
- docSetImposterStyle(imposterStyle, 'left', `${left}px`);
- docSetImposterStyle(imposterStyle, 'margin', '0');
- docSetImposterStyle(imposterStyle, 'pointer-events', 'auto');
-
- if (isTextarea) {
- if (elementStyle.overflow === 'visible') {
- docSetImposterStyle(imposterStyle, 'overflow', 'auto');
- }
- } else {
- docSetImposterStyle(imposterStyle, 'overflow', 'hidden');
- docSetImposterStyle(imposterStyle, 'white-space', 'nowrap');
- docSetImposterStyle(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);
- docSetImposterStyle(imposterStyle, 'width', `${width}px`);
- docSetImposterStyle(imposterStyle, 'height', `${height}px`);
- }
- if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) {
- left += (elementRect.left - imposterRect.left);
- top += (elementRect.top - imposterRect.top);
- docSetImposterStyle(imposterStyle, 'left', `${left}px`);
- docSetImposterStyle(imposterStyle, 'top', `${top}px`);
- }
-
- imposter.scrollTop = element.scrollTop;
- imposter.scrollLeft = element.scrollLeft;
-
- return [imposter, container];
-}
-
-function docElementsFromPoint(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] : [];
-}
-
-function docRangeFromPoint(x, y, deepDomScan) {
- const elements = docElementsFromPoint(x, y, deepDomScan);
- 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] = docImposterCreate(element, false);
- break;
- case 'TEXTAREA':
- imposterSourceElement = element;
- [imposter, imposterContainer] = docImposterCreate(element, true);
- break;
- }
- }
-
- const range = caretRangeFromPointExt(x, y, deepDomScan ? elements : []);
- if (range !== null) {
- if (imposter !== null) {
- docSetImposterStyle(imposterContainer.style, 'z-index', '-2147483646');
- docSetImposterStyle(imposter.style, 'pointer-events', 'none');
- }
- return new TextSourceRange(range, '', imposterContainer, imposterSourceElement);
- } else {
- if (imposterContainer !== null) {
- imposterContainer.parentNode.removeChild(imposterContainer);
- }
- return null;
- }
-}
-
-function docSentenceExtract(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
- };
-}
-
-function 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 (!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 (!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;
-}
-
-function isWhitespace(string) {
- return string.trim().length === 0;
-}
-
-const caretRangeFromPoint = (() => {
- if (typeof document.caretRangeFromPoint === 'function') {
- // Chrome, Edge
- return (x, y) => document.caretRangeFromPoint(x, y);
- }
-
- if (typeof document.caretPositionFromPoint === 'function') {
- // Firefox
- return (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;
- };
- }
-
- // No support
- return () => null;
-})();
-
-function caretRangeFromPointExt(x, y, elements) {
- const modifications = [];
- try {
- let i = 0;
- let startContinerPre = null;
- while (true) {
- const range = caretRangeFromPoint(x, y);
- if (range === null) {
- return null;
- }
-
- const startContainer = range.startContainer;
- if (startContinerPre !== startContainer) {
- if (isPointInRange(x, y, range)) {
- return range;
- }
- startContinerPre = startContainer;
- }
-
- i = disableTransparentElement(elements, i, modifications);
- if (i < 0) {
- return null;
- }
- }
- } finally {
- if (modifications.length > 0) {
- restoreElementStyleModifications(modifications);
- }
- }
-}
-
-function disableTransparentElement(elements, i, modifications) {
- while (true) {
- if (i >= elements.length) {
- return -1;
- }
-
- const element = elements[i++];
- if (isElementTransparent(element)) {
- const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
- modifications.push({element, style});
- element.style.setProperty('pointer-events', 'none', 'important');
- return i;
- }
- }
-}
-
-function restoreElementStyleModifications(modifications) {
- for (const {element, style} of modifications) {
- if (style === null) {
- element.removeAttribute('style');
- } else {
- element.setAttribute('style', style);
- }
- }
-}
-
-function 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' && isColorTransparent(style.backgroundColor))
- );
-}
-
-function isColorTransparent(cssColor) {
- return REGEX_TRANSPARENT_COLOR.test(cssColor);
-}