245 lines
7.1 KiB
JavaScript
245 lines
7.1 KiB
JavaScript
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/*
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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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/*
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* TextSourceRange
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*/
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export class TextSourceRange {
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constructor(range, content='') {
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this.range = range;
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this.content = content;
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}
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clone() {
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return new TextSourceRange(this.range.cloneRange(), this.content);
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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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containsPoint(point) {
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const rect = this.getPaddedRect();
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return point.x >= rect.left && point.x <= rect.right;
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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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getPaddedRect() {
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const range = this.range.cloneRange();
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const startOffset = range.startOffset;
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const endOffset = range.endOffset;
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const node = range.startContainer;
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range.setStart(node, Math.max(0, startOffset - 1));
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range.setEnd(node, Math.min(node.length, endOffset + 1));
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return range.getBoundingClientRect();
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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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if (node.nodeType !== 1) {
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return false;
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}
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const skip = ['RT', 'SCRIPT', 'STYLE'];
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if (skip.includes(node.nodeName)) {
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return false;
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}
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const style = window.getComputedStyle(node);
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const hidden =
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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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return !hidden;
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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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if (!TextSourceRange.seekForwardHelper(node, state)) {
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return state;
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}
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for (let current = node; current !== null; current = current.parentElement) {
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for (let sibling = current.nextSibling; sibling !== null; sibling = sibling.nextSibling) {
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if (!TextSourceRange.seekForwardHelper(sibling, state)) {
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return state;
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}
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}
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}
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return state;
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}
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static seekForwardHelper(node, state) {
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if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
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const offset = state.node === node ? state.offset : 0;
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const remaining = node.length - offset;
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const consumed = Math.min(remaining, state.remainder);
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state.content = state.content + node.nodeValue.substring(offset, offset + consumed);
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state.node = node;
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state.offset = offset + consumed;
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state.remainder -= consumed;
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} else if (TextSourceRange.shouldEnter(node)) {
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for (let i = 0; i < node.childNodes.length; ++i) {
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if (!TextSourceRange.seekForwardHelper(node.childNodes[i], state)) {
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break;
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}
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}
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}
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return state.remainder > 0;
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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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if (!TextSourceRange.seekBackwardHelper(node, state)) {
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return state;
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}
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for (let current = node; current !== null; current = current.parentElement) {
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for (let sibling = current.previousSibling; sibling !== null; sibling = sibling.previousSibling) {
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if (!TextSourceRange.seekBackwardHelper(sibling, state)) {
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return state;
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}
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}
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}
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return state;
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}
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static seekBackwardHelper(node, state) {
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if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
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const offset = state.node === node ? state.offset : node.length;
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const remaining = offset;
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const consumed = Math.min(remaining, state.remainder);
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state.content = node.nodeValue.substring(offset - consumed, offset) + state.content;
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state.node = node;
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state.offset = offset - consumed;
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state.remainder -= consumed;
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} else if (TextSourceRange.shouldEnter(node)) {
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for (let i = node.childNodes.length - 1; i >= 0; --i) {
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if (!TextSourceRange.seekBackwardHelper(node.childNodes[i], state)) {
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break;
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}
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}
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}
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return state.remainder > 0;
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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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export 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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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) {
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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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this.content = this.content || '';
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this.content = this.content.substring(0, length);
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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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containsPoint(point) {
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const rect = this.getRect();
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return point.x >= rect.left && point.x <= rect.right;
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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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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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