1 files changed, 177 insertions, 0 deletions
diff --git a/ext/fg/js/document.module.js b/ext/fg/js/document.module.js
new file mode 100644
index 00000000..d86aff33
--- /dev/null
+++ b/ext/fg/js/document.module.js
@@ -0,0 +1,177 @@
+/*
+ * 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
+    };
+}