use ES6 import and export

7 files changed, 464 insertions, 41 deletions

diff --git a/ext/bg/js/search.js b/ext/bg/js/search.js
index 40bf2019..911b5566 100644
--- a/ext/bg/js/search.js
+++ b/ext/bg/js/search.js
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+import {Display} from '../../mixed/js/display.js';
 
 class DisplaySearch extends Display {
     constructor() {
diff --git a/ext/bg/search.html b/ext/bg/search.html
index 0d6c7cad..09b761cc 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -43,9 +43,8 @@
         <script src="/bg/js/handlebars.js"></script>
         <script src="/bg/js/templates.js"></script>
         <script src="/bg/js/util.js"></script>
-        <script src="/mixed/js/display.js"></script>
         <script src="/mixed/js/japanese.js"></script>
 
-        <script src="/bg/js/search.js"></script>
+        <script type="module" src="/bg/js/search.js"></script>
     </body>
 </html>
diff --git a/ext/fg/float.html b/ext/fg/float.html
index 07f2d58b..4860753a 100644
--- a/ext/fg/float.html
+++ b/ext/fg/float.html
@@ -36,10 +36,7 @@
 
         <script src="/fg/js/api.js"></script>
         <script src="/fg/js/util.js"></script>
-        <script src="/fg/js/document.js"></script>
-        <script src="/fg/js/source.js"></script>
-        <script src="/mixed/js/display.js"></script>
 
-        <script src="/fg/js/float.js"></script>
+        <script type="module" src="/fg/js/float.js"></script>
     </body>
 </html>
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
+    };
+}
diff --git a/ext/fg/js/float.js b/ext/fg/js/float.js
index 65ed89a1..9301135b 100644
--- a/ext/fg/js/float.js
+++ b/ext/fg/js/float.js
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+import {Display} from '../../mixed/js/display.js';
 
 class DisplayFloat extends Display {
     constructor() {
@@ -123,41 +124,6 @@ class DisplayFloat extends Display {
             parent.appendChild(this.styleNode);
         }
     }
-
-    async onTermLookup(e) {
-        try {
-            e.preventDefault();
-
-            const clickedElement = $(e.target);
-            const textSource = docRangeFromPoint({x: e.clientX, y: e.clientY});
-            textSource.setEndOffset(this.options.scanning.length);
-
-            const {definitions, length} = await apiTermsFind(textSource.text());
-            if (definitions.length === 0) {
-                return false;
-            }
-
-            textSource.setEndOffset(length);
-
-            const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
-
-            const context = {
-                source: {
-                    definitions: this.definitions,
-                    index: Display.entryIndexFind(clickedElement)
-                }
-            };
-
-            if (this.context) {
-                context.sentence = sentence;
-                context.url = this.context.url;
-            }
-
-            this.termsShow(definitions, this.options, context);
-        } catch (e) {
-            this.onError(e);
-        }
-    }
 }
 
 window.yomichan_display = new DisplayFloat();
diff --git a/ext/fg/js/source.module.js b/ext/fg/js/source.module.js
new file mode 100644
index 00000000..ed9263c5
--- /dev/null
+++ b/ext/fg/js/source.module.js
@@ -0,0 +1,244 @@
+/*
+ * 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/>.
+ */
+
+
+/*
+ * TextSourceRange
+ */
+
+export class TextSourceRange {
+    constructor(range, content='') {
+        this.range = range;
+        this.content = content;
+    }
+
+    clone() {
+        return new TextSourceRange(this.range.cloneRange(), this.content);
+    }
+
+    text() {
+        return this.content;
+    }
+
+    setEndOffset(length) {
+        const state = TextSourceRange.seekForward(this.range.startContainer, this.range.startOffset, length);
+        this.range.setEnd(state.node, state.offset);
+        this.content = state.content;
+        return length - state.remainder;
+    }
+
+    setStartOffset(length) {
+        const state = TextSourceRange.seekBackward(this.range.startContainer, this.range.startOffset, length);
+        this.range.setStart(state.node, state.offset);
+        this.content = state.content;
+        return length - state.remainder;
+    }
+
+    containsPoint(point) {
+        const rect = this.getPaddedRect();
+        return point.x >= rect.left && point.x <= rect.right;
+    }
+
+    getRect() {
+        return this.range.getBoundingClientRect();
+    }
+
+    getPaddedRect() {
+        const range = this.range.cloneRange();
+        const startOffset = range.startOffset;
+        const endOffset = range.endOffset;
+        const node = range.startContainer;
+
+        range.setStart(node, Math.max(0, startOffset - 1));
+        range.setEnd(node, Math.min(node.length, endOffset + 1));
+
+        return range.getBoundingClientRect();
+    }
+
+    select() {
+        const selection = window.getSelection();
+        selection.removeAllRanges();
+        selection.addRange(this.range);
+    }
+
+    deselect() {
+        const selection = window.getSelection();
+        selection.removeAllRanges();
+    }
+
+    equals(other) {
+        return other && other.range && other.range.compareBoundaryPoints(Range.START_TO_START, this.range) === 0;
+    }
+
+    static shouldEnter(node) {
+        if (node.nodeType !== 1) {
+            return false;
+        }
+
+        const skip = ['RT', 'SCRIPT', 'STYLE'];
+        if (skip.includes(node.nodeName)) {
+            return false;
+        }
+
+        const style = window.getComputedStyle(node);
+        const hidden =
+            style.visibility === 'hidden' ||
+            style.display === 'none' ||
+            parseFloat(style.fontSize) === 0;
+
+        return !hidden;
+    }
+
+    static seekForward(node, offset, length) {
+        const state = {node, offset, remainder: length, content: ''};
+        if (!TextSourceRange.seekForwardHelper(node, state)) {
+            return state;
+        }
+
+        for (let current = node; current !== null; current = current.parentElement) {
+            for (let sibling = current.nextSibling; sibling !== null; sibling = sibling.nextSibling) {
+                if (!TextSourceRange.seekForwardHelper(sibling, state)) {
+                    return state;
+                }
+            }
+        }
+
+        return state;
+    }
+
+    static seekForwardHelper(node, state) {
+        if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
+            const offset = state.node === node ? state.offset : 0;
+            const remaining = node.length - offset;
+            const consumed = Math.min(remaining, state.remainder);
+            state.content = state.content + node.nodeValue.substring(offset, offset + consumed);
+            state.node = node;
+            state.offset = offset + consumed;
+            state.remainder -= consumed;
+        } else if (TextSourceRange.shouldEnter(node)) {
+            for (let i = 0; i < node.childNodes.length; ++i) {
+                if (!TextSourceRange.seekForwardHelper(node.childNodes[i], state)) {
+                    break;
+                }
+            }
+        }
+
+        return state.remainder > 0;
+    }
+
+    static seekBackward(node, offset, length) {
+        const state = {node, offset, remainder: length, content: ''};
+        if (!TextSourceRange.seekBackwardHelper(node, state)) {
+            return state;
+        }
+
+        for (let current = node; current !== null; current = current.parentElement) {
+            for (let sibling = current.previousSibling; sibling !== null; sibling = sibling.previousSibling) {
+                if (!TextSourceRange.seekBackwardHelper(sibling, state)) {
+                    return state;
+                }
+            }
+        }
+
+        return state;
+    }
+
+    static seekBackwardHelper(node, state) {
+        if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
+            const offset = state.node === node ? state.offset : node.length;
+            const remaining = offset;
+            const consumed = Math.min(remaining, state.remainder);
+            state.content = node.nodeValue.substring(offset - consumed, offset) + state.content;
+            state.node = node;
+            state.offset = offset - consumed;
+            state.remainder -= consumed;
+        } else if (TextSourceRange.shouldEnter(node)) {
+            for (let i = node.childNodes.length - 1; i >= 0; --i) {
+                if (!TextSourceRange.seekBackwardHelper(node.childNodes[i], state)) {
+                    break;
+                }
+            }
+        }
+
+        return state.remainder > 0;
+    }
+}
+
+
+/*
+ * TextSourceElement
+ */
+
+export class TextSourceElement {
+    constructor(element, content='') {
+        this.element = element;
+        this.content = content;
+    }
+
+    clone() {
+        return new TextSourceElement(this.element, this.content);
+    }
+
+    text() {
+        return this.content;
+    }
+
+    setEndOffset(length) {
+        switch (this.element.nodeName) {
+            case 'BUTTON':
+                this.content = this.element.innerHTML;
+                break;
+            case 'IMG':
+                this.content = this.element.getAttribute('alt');
+                break;
+            default:
+                this.content = this.element.value;
+                break;
+        }
+
+        this.content = this.content || '';
+        this.content = this.content.substring(0, length);
+
+        return this.content.length;
+    }
+
+    setStartOffset(length) {
+        return 0;
+    }
+
+    containsPoint(point) {
+        const rect = this.getRect();
+        return point.x >= rect.left && point.x <= rect.right;
+    }
+
+    getRect() {
+        return this.element.getBoundingClientRect();
+    }
+
+    select() {
+        // NOP
+    }
+
+    deselect() {
+        // NOP
+    }
+
+    equals(other) {
+        return other && other.element === this.element && other.content === this.content;
+    }
+}
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index dc6f5798..5d259936 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -17,6 +17,8 @@
  */
 
 
+import {docRangeFromPoint, docSentenceExtract} from '../../fg/js/document.module.js';
+
 class Display {
     constructor(spinner, container) {
         this.spinner = spinner;
@@ -69,6 +71,41 @@ class Display {
         }
     }
 
+    async onTermLookup(e) {
+        try {
+            e.preventDefault();
+
+            const clickedElement = $(e.target);
+            const textSource = docRangeFromPoint({x: e.clientX, y: e.clientY});
+            textSource.setEndOffset(this.options.scanning.length);
+
+            const {definitions, length} = await apiTermsFind(textSource.text());
+            if (definitions.length === 0) {
+                return false;
+            }
+
+            textSource.setEndOffset(length);
+
+            const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
+
+            const context = {
+                source: {
+                    definitions: this.definitions,
+                    index: Display.entryIndexFind(clickedElement)
+                }
+            };
+
+            if (this.context) {
+                context.sentence = sentence;
+                context.url = this.context.url;
+            }
+
+            this.termsShow(definitions, this.options, context);
+        } catch (e) {
+            this.onError(e);
+        }
+    }
+
     onAudioPlay(e) {
         e.preventDefault();
         const link = $(e.currentTarget);
@@ -460,3 +497,5 @@ class Display {
         return $('.entry').eq(index).find('.action-view-note');
     }
 }
+
+export {Display};