145 lines
4.5 KiB
JavaScript
145 lines
4.5 KiB
JavaScript
/*
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* Copyright (C) 2016 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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class TextSourceRange {
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constructor(range) {
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this.rng = range;
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}
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text() {
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return this.rng.toString();
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}
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setEndOffset(length) {
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const end = TextSourceRange.seekForward(this.rng.startContainer, this.rng.startOffset + length);
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this.rng.setEnd(end.node, end.offset);
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return length - end.length;
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}
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setStartOffset(length) {
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const start = TextSourceRange.seekBackward(this.rng.startContainer, length + (this.rng.startContainer.length - this.rng.startOffset));
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this.rng.setStart(start.node, start.offset);
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return length - start.length;
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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.rng.getBoundingClientRect();
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}
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getPaddedRect() {
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const range = this.rng.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.rng);
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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.rng && other.rng.compareBoundaryPoints(Range.START_TO_START, this.rng) == 0;
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}
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static seekForward(node, length) {
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const state = {node, offset: 0, length};
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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) {
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const consumed = Math.min(node.length, state.length);
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state.node = node;
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state.offset = consumed;
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state.length -= consumed;
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} else {
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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.length > 0;
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}
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static seekBackward(node, length) {
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const state = {node, offset: node.length, length};
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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) {
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const consumed = Math.min(node.length, state.length);
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state.node = node;
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state.offset = node.length - consumed;
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state.length -= consumed;
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} else {
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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.length > 0;
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}
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}
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