378 lines
10 KiB
JavaScript
378 lines
10 KiB
JavaScript
/*
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* Copyright (C) 2016-2017 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// \u200c (Zero-width non-joiner) appears on Google Docs from Chrome 76 onwards
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const IGNORE_TEXT_PATTERN = /\u200c/;
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/*
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* TextSourceRange
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*/
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class TextSourceRange {
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constructor(range, content, imposterContainer) {
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this.range = range;
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this.content = content;
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this.imposterContainer = imposterContainer;
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}
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clone() {
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return new TextSourceRange(this.range.cloneRange(), this.content, this.imposterContainer);
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}
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cleanup() {
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if (this.imposterContainer !== null && this.imposterContainer.parentNode !== null) {
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this.imposterContainer.parentNode.removeChild(this.imposterContainer);
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}
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}
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text() {
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return this.content;
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}
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setEndOffset(length) {
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const state = TextSourceRange.seekForward(this.range.startContainer, this.range.startOffset, length);
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this.range.setEnd(state.node, state.offset);
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this.content = state.content;
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return length - state.remainder;
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}
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setStartOffset(length) {
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const state = TextSourceRange.seekBackward(this.range.startContainer, this.range.startOffset, length);
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this.range.setStart(state.node, state.offset);
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this.content = state.content;
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return length - state.remainder;
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}
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getRect() {
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return this.range.getBoundingClientRect();
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}
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getWritingMode() {
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return TextSourceRange.getElementWritingMode(TextSourceRange.getParentElement(this.range.startContainer));
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}
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select() {
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const selection = window.getSelection();
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selection.removeAllRanges();
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selection.addRange(this.range);
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}
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deselect() {
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const selection = window.getSelection();
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selection.removeAllRanges();
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}
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equals(other) {
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return other && other.range && other.range.compareBoundaryPoints(Range.START_TO_START, this.range) === 0;
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}
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static shouldEnter(node) {
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switch (node.nodeName.toUpperCase()) {
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case 'RT':
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case 'SCRIPT':
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case 'STYLE':
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return false;
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}
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const style = window.getComputedStyle(node);
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return !(
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style.visibility === 'hidden' ||
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style.display === 'none' ||
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parseFloat(style.fontSize) === 0);
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}
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static getRubyElement(node) {
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node = TextSourceRange.getParentElement(node);
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if (node !== null && node.nodeName.toUpperCase() === "RT") {
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node = node.parentNode;
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return (node !== null && node.nodeName.toUpperCase() === "RUBY") ? node : null;
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}
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return null;
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}
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static seekForward(node, offset, length) {
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const state = {node, offset, remainder: length, content: ''};
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const TEXT_NODE = Node.TEXT_NODE;
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const ELEMENT_NODE = Node.ELEMENT_NODE;
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let resetOffset = false;
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const ruby = TextSourceRange.getRubyElement(node);
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if (ruby !== null) {
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node = ruby;
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resetOffset = true;
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}
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while (node !== null) {
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let visitChildren = true;
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const nodeType = node.nodeType;
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if (nodeType === TEXT_NODE) {
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state.node = node;
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if (TextSourceRange.seekForwardTextNode(state, resetOffset)) {
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break;
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}
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resetOffset = true;
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} else if (nodeType === ELEMENT_NODE) {
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visitChildren = TextSourceRange.shouldEnter(node);
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}
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node = TextSourceRange.getNextNode(node, visitChildren);
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}
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return state;
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}
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static seekForwardTextNode(state, resetOffset) {
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const nodeValue = state.node.nodeValue;
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const nodeValueLength = nodeValue.length;
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let content = state.content;
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let offset = resetOffset ? 0 : state.offset;
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let remainder = state.remainder;
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let result = false;
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for (; offset < nodeValueLength; ++offset) {
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const c = nodeValue[offset];
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if (!IGNORE_TEXT_PATTERN.test(c)) {
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content += c;
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if (--remainder <= 0) {
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result = true;
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++offset;
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break;
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}
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}
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}
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state.offset = offset;
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state.content = content;
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state.remainder = remainder;
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return result;
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}
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static seekBackward(node, offset, length) {
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const state = {node, offset, remainder: length, content: ''};
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const TEXT_NODE = Node.TEXT_NODE;
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const ELEMENT_NODE = Node.ELEMENT_NODE;
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let resetOffset = false;
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const ruby = TextSourceRange.getRubyElement(node);
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if (ruby !== null) {
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node = ruby;
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resetOffset = true;
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}
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while (node !== null) {
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let visitChildren = true;
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const nodeType = node.nodeType;
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if (nodeType === TEXT_NODE) {
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state.node = node;
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if (TextSourceRange.seekBackwardTextNode(state, resetOffset)) {
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break;
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}
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resetOffset = true;
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} else if (nodeType === ELEMENT_NODE) {
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visitChildren = TextSourceRange.shouldEnter(node);
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}
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node = TextSourceRange.getPreviousNode(node, visitChildren);
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}
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return state;
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}
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static seekBackwardTextNode(state, resetOffset) {
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const nodeValue = state.node.nodeValue;
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let content = state.content;
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let offset = resetOffset ? nodeValue.length : state.offset;
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let remainder = state.remainder;
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let result = false;
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for (; offset > 0; --offset) {
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const c = nodeValue[offset - 1];
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if (!IGNORE_TEXT_PATTERN.test(c)) {
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content = c + content;
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if (--remainder <= 0) {
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result = true;
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--offset;
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break;
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}
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}
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}
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state.offset = offset;
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state.content = content;
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state.remainder = remainder;
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return result;
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}
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static getParentElement(node) {
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while (node !== null && node.nodeType !== Node.ELEMENT_NODE) {
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node = node.parentNode;
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}
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return node;
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}
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static getElementWritingMode(element) {
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if (element === null) {
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return 'horizontal-tb';
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}
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const style = window.getComputedStyle(element);
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const writingMode = style.writingMode;
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return typeof writingMode === 'string' ? writingMode : 'horizontal-tb';
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}
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static getNodesInRange(range) {
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const end = range.endContainer;
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const nodes = [];
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for (let node = range.startContainer; node !== null; node = TextSourceRange.getNextNode(node, true)) {
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nodes.push(node);
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if (node === end) { break; }
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}
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return nodes;
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}
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static getNextNode(node, visitChildren) {
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let next = visitChildren ? node.firstChild : null;
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if (next === null) {
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while (true) {
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next = node.nextSibling;
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if (next !== null) { break; }
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next = node.parentNode;
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if (next === null) { break; }
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node = next;
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}
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}
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return next;
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}
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static getPreviousNode(node, visitChildren) {
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let next = visitChildren ? node.lastChild : null;
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if (next === null) {
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while (true) {
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next = node.previousSibling;
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if (next !== null) { break; }
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next = node.parentNode;
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if (next === null) { break; }
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node = next;
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}
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}
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return next;
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}
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static anyNodeMatchesSelector(nodeList, selector) {
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for (const node of nodeList) {
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if (TextSourceRange.nodeMatchesSelector(node, selector)) {
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return true;
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}
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}
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return false;
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}
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static nodeMatchesSelector(node, selector) {
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for (; node !== null; node = node.parentNode) {
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if (node.nodeType === Node.ELEMENT_NODE) {
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return node.matches(selector);
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}
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}
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return false;
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}
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}
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/*
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* TextSourceElement
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*/
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class TextSourceElement {
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constructor(element, content='') {
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this.element = element;
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this.content = content;
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}
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clone() {
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return new TextSourceElement(this.element, this.content);
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}
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cleanup() {
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// NOP
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}
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text() {
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return this.content;
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}
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setEndOffset(length) {
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switch (this.element.nodeName.toUpperCase()) {
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case 'BUTTON':
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this.content = this.element.innerHTML;
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break;
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case 'IMG':
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this.content = this.element.getAttribute('alt');
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break;
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default:
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this.content = this.element.value;
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break;
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}
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let consumed = 0;
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let content = '';
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for (let currentChar of this.content || '') {
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if (consumed >= length) {
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break;
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} else if (!currentChar.match(IGNORE_TEXT_PATTERN)) {
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consumed++;
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content += currentChar;
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}
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}
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this.content = content;
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return this.content.length;
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}
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setStartOffset(length) {
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return 0;
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}
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getRect() {
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return this.element.getBoundingClientRect();
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}
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getWritingMode() {
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return 'horizontal-tb';
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}
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select() {
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// NOP
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}
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deselect() {
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// NOP
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}
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equals(other) {
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return other && other.element === this.element && other.content === this.content;
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}
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}
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