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+/*
+ * Copyright (C) 2016-2017 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+import {TextSourceRange, TextSourceElement} from './source.module.js';
+
+export function docOffsetCalc(element) {
+ const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
+ const scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft;
+
+ const clientTop = document.documentElement.clientTop || document.body.clientTop || 0;
+ const clientLeft = document.documentElement.clientLeft || document.body.clientLeft || 0;
+
+ const rect = element.getBoundingClientRect();
+ const top = Math.round(rect.top + scrollTop - clientTop);
+ const left = Math.round(rect.left + scrollLeft - clientLeft);
+
+ return {top, left};
+}
+
+export function docImposterCreate(element) {
+ const styleProps = window.getComputedStyle(element);
+ const stylePairs = [];
+ for (const key of styleProps) {
+ stylePairs.push(`${key}: ${styleProps[key]};`);
+ }
+
+ const offset = docOffsetCalc(element);
+ const imposter = document.createElement('div');
+ imposter.className = 'yomichan-imposter';
+ imposter.innerText = element.value;
+ imposter.style.cssText = stylePairs.join('\n');
+ imposter.style.position = 'absolute';
+ imposter.style.top = `${offset.top}px`;
+ imposter.style.left = `${offset.left}px`;
+ imposter.style.opacity = 0;
+ imposter.style.zIndex = 2147483646;
+ if (element.nodeName === 'TEXTAREA' && styleProps.overflow === 'visible') {
+ imposter.style.overflow = 'auto';
+ }
+
+ document.body.appendChild(imposter);
+ imposter.scrollTop = element.scrollTop;
+ imposter.scrollLeft = element.scrollLeft;
+
+ return imposter;
+}
+
+export function docImposterDestroy() {
+ for (const element of document.getElementsByClassName('yomichan-imposter')) {
+ element.parentNode.removeChild(element);
+ }
+}
+
+export function docRangeFromPoint(point) {
+ const element = document.elementFromPoint(point.x, point.y);
+ let imposter = null;
+ if (element) {
+ if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
+ return new TextSourceElement(element);
+ } else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
+ imposter = docImposterCreate(element);
+ }
+ }
+
+ if (!document.caretRangeFromPoint) {
+ document.caretRangeFromPoint = (x, y) => {
+ const position = document.caretPositionFromPoint(x,y);
+ if (position && position.offsetNode && position.offsetNode.nodeType === Node.TEXT_NODE) {
+ const range = document.createRange();
+ range.setStart(position.offsetNode, position.offset);
+ range.setEnd(position.offsetNode, position.offset);
+ return range;
+ }
+ return null;
+ };
+ }
+
+ const range = document.caretRangeFromPoint(point.x, point.y);
+ if (range === null) {
+ return;
+ }
+
+ if(imposter !== null) imposter.style.zIndex = -2147483646;
+
+ const rects = range.getClientRects();
+ for (const rect of rects) {
+ if (point.y <= rect.bottom + 2) {
+ return new TextSourceRange(range);
+ }
+ }
+}
+
+export function docSentenceExtract(source, extent) {
+ const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
+ const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
+ const terminators = '…。..??!!';
+
+ const sourceLocal = source.clone();
+ const position = sourceLocal.setStartOffset(extent);
+ sourceLocal.setEndOffset(position + extent);
+ 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 = [quotesBwd[c]].concat(quoteStack);
+ }
+ }
+
+ 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 = [quotesFwd[c]].concat(quoteStack);
+ }
+ }
+
+ const text = content.substring(startPos, endPos);
+ const padding = text.length - text.replace(/^\s+/, '').length;
+
+ return {
+ text: text.trim(),
+ offset: position - startPos - padding
+ };
+}