Merge branch 'dev'

10 files changed, 512 insertions, 466 deletions

diff --git a/ext/fg/css/client.css b/ext/fg/css/client.css
index 9f566480..b5b1f6bd 100644
--- a/ext/fg/css/client.css
+++ b/ext/fg/css/client.css
@@ -17,7 +17,7 @@
  */
 
 
-iframe#yomichan-popup {
+iframe#yomichan-float {
     all: initial;
     background-color: #fff;
     border: 1px solid #999;
diff --git a/ext/fg/frame.html b/ext/fg/float.html
index c20745af..89872cce 100644
--- a/ext/fg/frame.html
+++ b/ext/fg/float.html
@@ -5,7 +5,7 @@
         <title></title>
         <link rel="stylesheet" href="/mixed/lib/bootstrap/css/bootstrap.min.css">
         <link rel="stylesheet" href="/mixed/lib/bootstrap/css/bootstrap-theme.min.css">
-        <link rel="stylesheet" href="/mixed/css/frame.css">
+        <link rel="stylesheet" href="/mixed/css/display.css">
         <style type="text/css">
             .entry, .note {
                 padding-left: 10px;
@@ -18,9 +18,9 @@
             <img src="/mixed/img/spinner.gif">
         </div>
 
-        <div id="content"></div>
+        <div id="definitions"></div>
 
-        <div id="orphan">
+        <div id="error-orphaned">
             <div class="container-fluid">
                 <h1>Yomichan Updated!</h1>
                 <p>
@@ -32,9 +32,11 @@
 
         <script src="/mixed/lib/jquery.min.js"></script>
         <script src="/mixed/lib/wanakana.min.js"></script>
+
+        <script src="/fg/js/api.js"></script>
         <script src="/fg/js/util.js"></script>
-        <script src="/mixed/js/util.js"></script>
         <script src="/mixed/js/display.js"></script>
-        <script src="/fg/js/display-frame.js"></script>
+
+        <script src="/fg/js/float.js"></script>
     </body>
 </html>
diff --git a/ext/fg/js/api.js b/ext/fg/js/api.js
new file mode 100644
index 00000000..151882eb
--- /dev/null
+++ b/ext/fg/js/api.js
@@ -0,0 +1,58 @@
+/*
+ * 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/>.
+ */
+
+
+function apiOptionsSet(options) {
+    return utilInvoke('optionsSet', {options});
+}
+
+function apiOptionsGet() {
+    return utilInvoke('optionsGet');
+}
+
+function apiTermsFind(text) {
+    return utilInvoke('termsFind', {text});
+}
+
+function apiKanjiFind(text) {
+    return utilInvoke('kanjiFind', {text});
+}
+
+function apiDefinitionAdd(definition, mode) {
+    return utilInvoke('definitionAdd', {definition, mode});
+}
+
+function apiDefinitionsAddable(definitions, modes) {
+    return utilInvoke('definitionsAddable', {definitions, modes}).catch(() => null);
+}
+
+function apiNoteView(noteId) {
+    return utilInvoke('noteView', {noteId});
+}
+
+function apiTemplateRender(template, data) {
+    return utilInvoke('templateRender', {data, template});
+}
+
+function apiCommandExec(command) {
+    return utilInvoke('commandExec', {command});
+}
+
+function apiAudioGetUrl(definition, source) {
+    return utilInvoke('audioGetUrl', {definition, source});
+}
diff --git a/ext/fg/js/document.js b/ext/fg/js/document.js
new file mode 100644
index 00000000..26c85b40
--- /dev/null
+++ b/ext/fg/js/document.js
@@ -0,0 +1,163 @@
+/*
+ * 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/>.
+ */
+
+
+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};
+}
+
+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;
+}
+
+function docImposterDestroy() {
+    for (const element of document.getElementsByClassName('yomichan-imposter')) {
+        element.parentNode.removeChild(element);
+    }
+}
+
+function docRangeFromPoint(point) {
+    const element = document.elementFromPoint(point.x, point.y);
+    if (element) {
+        if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
+            return new TextSourceElement(element);
+        } else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
+            docImposterCreate(element);
+        }
+    }
+
+    if (!document.caretRangeFromPoint) {
+        document.caretRangeFromPoint = (x, y) => {
+            const position = document.caretPositionFromPoint(x,y);
+            if (position) {
+                const range = document.createRange();
+                range.setStart(position.offsetNode, position.offset);
+                range.setEnd(position.offsetNode, position.offset);
+                return range;
+            }
+        };
+    }
+
+    const range = document.caretRangeFromPoint(point.x, point.y);
+    if (range) {
+        return new TextSourceRange(range);
+    }
+}
+
+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/display-frame.js b/ext/fg/js/float.js
index 9fd09e74..22374f8b 100644
--- a/ext/fg/js/display-frame.js
+++ b/ext/fg/js/float.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * 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
@@ -17,61 +17,45 @@
  */
 
 
-window.displayFrame = new class extends Display {
+class DisplayFloat extends Display {
     constructor() {
-        super($('#spinner'), $('#content'));
-        $(window).on('message', this.onMessage.bind(this));
+        super($('#spinner'), $('#definitions'));
+        $(window).on('message', utilAsync(this.onMessage.bind(this)));
     }
 
-    definitionAdd(definition, mode) {
-        return bgDefinitionAdd(definition, mode);
-    }
-
-    definitionsAddable(definitions, modes) {
-        return bgDefinitionsAddable(definitions, modes);
-    }
-
-    templateRender(template, data) {
-        return bgTemplateRender(template, data);
-    }
-
-    kanjiFind(character) {
-        return bgKanjiFind(character);
-    }
-
-    handleError(error) {
-        if (window.orphaned) {
-            this.showOrphaned();
+    onError(error) {
+        if (window.yomichan_orphaned) {
+            this.onOrphaned();
         } else {
             window.alert(`Error: ${error}`);
         }
     }
 
-    clearSearch() {
-        window.parent.postMessage('popupClose', '*');
+    onOrphaned() {
+        $('#definitions').hide();
+        $('#error-orphaned').show();
     }
 
-    selectionCopy() {
-        window.parent.postMessage('selectionCopy', '*');
+    onSearchClear() {
+        window.parent.postMessage('popupClose', '*');
     }
 
-    showOrphaned() {
-        $('#content').hide();
-        $('#orphan').show();
+    onSelectionCopy() {
+        window.parent.postMessage('selectionCopy', '*');
     }
 
     onMessage(e) {
         const handlers = {
-            showTermDefs: ({definitions, options, context}) => {
-                this.showTermDefs(definitions, options, context);
+            termsShow: ({definitions, options, context}) => {
+                this.termsShow(definitions, options, context);
             },
 
-            showKanjiDefs: ({definitions, options, context}) => {
-                this.showKanjiDefs(definitions, options, context);
+            kanjiShow: ({definitions, options, context}) => {
+                this.kanjiShow(definitions, options, context);
             },
 
-            showOrphaned: () => {
-                this.showOrphaned();
+            orphaned: () => {
+                this.onOrphaned();
             }
         };
 
@@ -85,8 +69,8 @@ window.displayFrame = new class extends Display {
     onKeyDown(e) {
         const handlers = {
             67: /* c */ () => {
-                if (e.ctrlKey && window.getSelection().toString() === '') {
-                    this.selectionCopy();
+                if (e.ctrlKey && !window.getSelection().toString()) {
+                    this.onSelectionCopy();
                     return true;
                 }
             }
@@ -99,4 +83,6 @@ window.displayFrame = new class extends Display {
             super.onKeyDown(e);
         }
     }
-};
+}
+
+window.yomichan_display = new DisplayFloat();
diff --git a/ext/fg/js/driver.js b/ext/fg/js/frontend.js
index b0cc4613..41c93f00 100644
--- a/ext/fg/js/driver.js
+++ b/ext/fg/js/frontend.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * 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
@@ -17,38 +17,31 @@
  */
 
 
-window.driver = new class {
+class Frontend {
     constructor() {
         this.popup = new Popup();
         this.popupTimer = null;
-        this.lastMousePos = null;
         this.mouseDownLeft = false;
         this.mouseDownMiddle = false;
-        this.lastTextSource = null;
+        this.textSourceLast = null;
         this.pendingLookup = false;
         this.options = null;
+    }
 
-        bgOptionsGet().then(options => {
-            this.options = options;
-            window.addEventListener('mouseover', this.onMouseOver.bind(this));
+    async prepare() {
+        try {
+            this.options = await apiOptionsGet();
+
+            window.addEventListener('message', this.onFrameMessage.bind(this));
             window.addEventListener('mousedown', this.onMouseDown.bind(this));
-            window.addEventListener('mouseup', this.onMouseUp.bind(this));
             window.addEventListener('mousemove', this.onMouseMove.bind(this));
-            window.addEventListener('resize', e => this.searchClear());
-            window.addEventListener('message', this.onFrameMessage.bind(this));
-            chrome.runtime.onMessage.addListener(this.onBgMessage.bind(this));
-        }).catch(this.handleError.bind(this));
-    }
-
-    popupTimerSet(callback) {
-        this.popupTimerClear();
-        this.popupTimer = window.setTimeout(callback, this.options.scanning.delay);
-    }
+            window.addEventListener('mouseover', this.onMouseOver.bind(this));
+            window.addEventListener('mouseup', this.onMouseUp.bind(this));
+            window.addEventListener('resize', this.onResize.bind(this));
 
-    popupTimerClear() {
-        if (this.popupTimer) {
-            window.clearTimeout(this.popupTimer);
-            this.popupTimer = null;
+            chrome.runtime.onMessage.addListener(this.onBgMessage.bind(this));
+        } catch (e) {
+            this.onError(e);
         }
     }
 
@@ -59,7 +52,6 @@ window.driver = new class {
     }
 
     onMouseMove(e) {
-        this.lastMousePos = {x: e.clientX, y: e.clientY};
         this.popupTimerClear();
 
         if (!this.options.general.enable) {
@@ -70,6 +62,10 @@ window.driver = new class {
             return;
         }
 
+        if (this.pendingLookup) {
+            return;
+        }
+
         const mouseScan = this.mouseDownMiddle && this.options.scanning.middleMouse;
         const keyScan =
             this.options.scanning.modifier === 'alt' && e.altKey ||
@@ -81,16 +77,24 @@ window.driver = new class {
             return;
         }
 
-        const searchFunc = () => this.searchAt(this.lastMousePos);
+        const search = async () => {
+            try {
+                await this.searchAt({x: e.clientX, y: e.clientY});
+                this.pendingLookup = false;
+            } catch (e) {
+                this.onError(e);
+            }
+        };
+
         if (this.options.scanning.modifier === 'none') {
-            this.popupTimerSet(searchFunc);
+            this.popupTimerSet(search);
         } else {
-            searchFunc();
+            search();
         }
     }
 
     onMouseDown(e) {
-        this.lastMousePos = {x: e.clientX, y: e.clientY};
+        this.mousePosLast = {x: e.clientX, y: e.clientY};
         this.popupTimerClear();
         this.searchClear();
 
@@ -126,6 +130,10 @@ window.driver = new class {
         }
     }
 
+    onResize() {
+        this.searchClear();
+    }
+
     onBgMessage({action, params}, sender, callback) {
         const handlers = {
             optionsSet: options => {
@@ -144,106 +152,122 @@ window.driver = new class {
         callback();
     }
 
-    searchAt(point) {
-        if (this.pendingLookup) {
-            return;
-        }
+    onError(error) {
+        window.alert(`Error: ${error}`);
+    }
 
-        const textSource = docRangeFromPoint(point);
-        if (!textSource || !textSource.containsPoint(point)) {
-            docImposterDestroy();
-            return;
-        }
+    popupTimerSet(callback) {
+        this.popupTimerClear();
+        this.popupTimer = window.setTimeout(callback, this.options.scanning.delay);
+    }
 
-        if (this.lastTextSource && this.lastTextSource.equals(textSource)) {
-            return;
+    popupTimerClear() {
+        if (this.popupTimer) {
+            window.clearTimeout(this.popupTimer);
+            this.popupTimer = null;
         }
+    }
 
-        this.pendingLookup = true;
-        this.searchTerms(textSource).then(found => {
-            if (!found) {
-                return this.searchKanji(textSource);
+    async searchAt(point) {
+        let textSource = null;
+
+        try {
+            if (this.pendingLookup) {
+                return;
+            }
+
+            textSource = docRangeFromPoint(point);
+            if (!textSource || !textSource.containsPoint(point)) {
+                docImposterDestroy();
+                return;
+            }
+
+            if (this.textSourceLast && this.textSourceLast.equals(textSource)) {
+                return;
+            }
+
+            this.pendingLookup = true;
+
+            if (!await this.searchTerms(textSource)) {
+                await this.searchKanji(textSource);
+            }
+        } catch (e) {
+            if (window.yomichan_orphaned) {
+                if (textSource && this.options.scanning.modifier !== 'none') {
+                    this.popup.showOrphaned(textSource.getRect(), this.options);
+                }
+            } else {
+                this.onError(e);
             }
-        }).catch(error => {
-            this.handleError(error, textSource);
-        }).then(() => {
+        } finally {
             docImposterDestroy();
             this.pendingLookup = false;
-        });
+        }
     }
 
-    searchTerms(textSource) {
+    async searchTerms(textSource) {
         textSource.setEndOffset(this.options.scanning.length);
 
-        return bgTermsFind(textSource.text()).then(({definitions, length}) => {
-            if (definitions.length === 0) {
-                return false;
-            } else {
-                textSource.setEndOffset(length);
-
-                const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
-                const url = window.location.href;
-                this.popup.showTermDefs(
-                    textSource.getRect(),
-                    definitions,
-                    this.options,
-                    {sentence, url}
-                );
-
-                this.lastTextSource = textSource;
-                if (this.options.scanning.selectText) {
-                    textSource.select();
-                }
+        const {definitions, length} = await apiTermsFind(textSource.text());
+        if (definitions.length === 0) {
+            return false;
+        }
 
-                return true;
-            }
-        });
+        textSource.setEndOffset(length);
+
+        const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
+        const url = window.location.href;
+        this.popup.termsShow(
+            textSource.getRect(),
+            definitions,
+            this.options,
+            {sentence, url}
+        );
+
+        this.textSourceLast = textSource;
+        if (this.options.scanning.selectText) {
+            textSource.select();
+        }
+
+        return true;
     }
 
-    searchKanji(textSource) {
+    async searchKanji(textSource) {
         textSource.setEndOffset(1);
 
-        return bgKanjiFind(textSource.text()).then(definitions => {
-            if (definitions.length === 0) {
-                return false;
-            } else {
-                const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
-                const url = window.location.href;
-                this.popup.showKanjiDefs(
-                    textSource.getRect(),
-                    definitions,
-                    this.options,
-                    {sentence, url}
-                );
-
-                this.lastTextSource = textSource;
-                if (this.options.scanning.selectText) {
-                    textSource.select();
-                }
+        const definitions = await apiKanjiFind(textSource.text());
+        if (definitions.length === 0) {
+            return false;
+        }
 
-                return true;
-            }
-        });
+        const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
+        const url = window.location.href;
+        this.popup.kanjiShow(
+            textSource.getRect(),
+            definitions,
+            this.options,
+            {sentence, url}
+        );
+
+        this.textSourceLast = textSource;
+        if (this.options.scanning.selectText) {
+            textSource.select();
+        }
+
+        return true;
     }
 
     searchClear() {
         docImposterDestroy();
         this.popup.hide();
 
-        if (this.options.scanning.selectText && this.lastTextSource) {
-            this.lastTextSource.deselect();
+        if (this.options.scanning.selectText && this.textSourceLast) {
+            this.textSourceLast.deselect();
         }
 
-        this.lastTextSource = null;
+        this.textSourceLast = null;
     }
+}
 
-    handleError(error, textSource) {
-        if (window.orphaned) {
-            if (textSource && this.options.scanning.modifier !== 'none') {
-                this.popup.showOrphaned(textSource.getRect(), this.options);
-            }
-        } else {
-            window.alert(`Error: ${error}`);
-        }
-    }
-};
+window.yomichan_frontend = new Frontend();
+window.yomichan_frontend.prepare();
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index cd7e846a..03958832 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * 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
@@ -20,10 +20,10 @@
 class Popup {
     constructor() {
         this.container = document.createElement('iframe');
-        this.container.id = 'yomichan-popup';
+        this.container.id = 'yomichan-float';
         this.container.addEventListener('mousedown', e => e.stopPropagation());
         this.container.addEventListener('scroll', e => e.stopPropagation());
-        this.container.setAttribute('src', chrome.extension.getURL('/fg/frame.html'));
+        this.container.setAttribute('src', chrome.extension.getURL('/fg/float.html'));
         this.container.style.width = '0px';
         this.container.style.height = '0px';
         this.injected = null;
@@ -40,51 +40,56 @@ class Popup {
         return this.injected;
     }
 
-    show(elementRect, options) {
-        return this.inject().then(() => {
-            const containerStyle = window.getComputedStyle(this.container);
-            const containerHeight = parseInt(containerStyle.height);
-            const containerWidth = parseInt(containerStyle.width);
-
-            const limitX = document.body.clientWidth;
-            const limitY = window.innerHeight;
-
-            let x = elementRect.left;
-            let width = Math.max(containerWidth, options.general.popupWidth);
-            const overflowX = Math.max(x + width - limitX, 0);
-            if (overflowX > 0) {
-                if (x >= overflowX) {
-                    x -= overflowX;
-                } else {
-                    width = limitX;
-                    x = 0;
-                }
-            }
+    async show(elementRect, options) {
+        await this.inject();
+
+        const containerStyle = window.getComputedStyle(this.container);
+        const containerHeight = parseInt(containerStyle.height);
+        const containerWidth = parseInt(containerStyle.width);
+
+        const limitX = document.body.clientWidth;
+        const limitY = window.innerHeight;
 
-            let y = 0;
-            let height = Math.max(containerHeight, options.general.popupHeight);
-            const yBelow = elementRect.bottom + options.general.popupOffset;
-            const yAbove = elementRect.top - options.general.popupOffset;
-            const overflowBelow = Math.max(yBelow + height - limitY, 0);
-            const overflowAbove = Math.max(height - yAbove, 0);
-            if (overflowBelow > 0 || overflowAbove > 0) {
-                if (overflowBelow < overflowAbove) {
-                    height = Math.max(height - overflowBelow, 0);
-                    y = yBelow;
-                } else {
-                    height = Math.max(height - overflowAbove, 0);
-                    y = Math.max(yAbove - height, 0);
-                }
+        let x = elementRect.left;
+        let width = Math.max(containerWidth, options.general.popupWidth);
+        const overflowX = Math.max(x + width - limitX, 0);
+        if (overflowX > 0) {
+            if (x >= overflowX) {
+                x -= overflowX;
             } else {
+                width = limitX;
+                x = 0;
+            }
+        }
+
+        let y = 0;
+        let height = Math.max(containerHeight, options.general.popupHeight);
+        const yBelow = elementRect.bottom + options.general.popupOffset;
+        const yAbove = elementRect.top - options.general.popupOffset;
+        const overflowBelow = Math.max(yBelow + height - limitY, 0);
+        const overflowAbove = Math.max(height - yAbove, 0);
+        if (overflowBelow > 0 || overflowAbove > 0) {
+            if (overflowBelow < overflowAbove) {
+                height = Math.max(height - overflowBelow, 0);
                 y = yBelow;
+            } else {
+                height = Math.max(height - overflowAbove, 0);
+                y = Math.max(yAbove - height, 0);
             }
+        } else {
+            y = yBelow;
+        }
+
+        this.container.style.left = `${x}px`;
+        this.container.style.top = `${y}px`;
+        this.container.style.width = `${width}px`;
+        this.container.style.height = `${height}px`;
+        this.container.style.visibility = 'visible';
+    }
 
-            this.container.style.left = `${x}px`;
-            this.container.style.top = `${y}px`;
-            this.container.style.width = `${width}px`;
-            this.container.style.height = `${height}px`;
-            this.container.style.visibility = 'visible';
-        });
+    async showOrphaned(elementRect, options) {
+        await this.show(elementRect, options);
+        this.invokeApi('orphaned');
     }
 
     hide() {
@@ -95,22 +100,14 @@ class Popup {
         return this.injected && this.container.style.visibility !== 'hidden';
     }
 
-    showTermDefs(elementRect, definitions, options, context) {
-        this.show(elementRect, options).then(() => {
-            this.invokeApi('showTermDefs', {definitions, options, context});
-        });
-    }
-
-    showKanjiDefs(elementRect, definitions, options, context) {
-        this.show(elementRect, options).then(() => {
-            this.invokeApi('showKanjiDefs', {definitions, options, context});
-        });
+    async termsShow(elementRect, definitions, options, context) {
+        await this.show(elementRect, options);
+        this.invokeApi('termsShow', {definitions, options, context});
     }
 
-    showOrphaned(elementRect, options) {
-        this.show(elementRect, options).then(() => {
-            this.invokeApi('showOrphaned');
-        });
+    async kanjiShow(elementRect, definitions, options, context) {
+        await this.show(elementRect, options);
+        this.invokeApi('kanjiShow', {definitions, options, context});
     }
 
     invokeApi(action, params={}) {
diff --git a/ext/fg/js/source-element.js b/ext/fg/js/source-element.js
deleted file mode 100644
index a8101382..00000000
--- a/ext/fg/js/source-element.js
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Copyright (C) 2016  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/>.
- */
-
-
-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.element === this.element && other.content === this.content;
-    }
-}
diff --git a/ext/fg/js/source-range.js b/ext/fg/js/source.js
index fa73b0a4..3b6ecb2a 100644
--- a/ext/fg/js/source-range.js
+++ b/ext/fg/js/source.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * 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
@@ -17,6 +17,10 @@
  */
 
 
+/*
+ * TextSourceRange
+ */
+
 class TextSourceRange {
     constructor(range, content='') {
         this.range = range;
@@ -174,3 +178,67 @@ class TextSourceRange {
         return state.remainder > 0;
     }
 }
+
+
+/*
+ * TextSourceElement
+ */
+
+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.element === this.element && other.content === this.content;
+    }
+}
diff --git a/ext/fg/js/util.js b/ext/fg/js/util.js
index c6270ce6..5eff4018 100644
--- a/ext/fg/js/util.js
+++ b/ext/fg/js/util.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * 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
@@ -17,11 +17,13 @@
  */
 
 
-/*
- * Background
- */
+function utilAsync(func) {
+    return function(...args) {
+        func.apply(this, args);
+    };
+}
 
-function bgInvoke(action, params) {
+function utilInvoke(action, params={}) {
     return new Promise((resolve, reject) => {
         try {
             chrome.runtime.sendMessage({action, params}, ({result, error}) => {
@@ -32,185 +34,8 @@ function bgInvoke(action, params) {
                 }
             });
         } catch (e) {
-            window.orphaned = true;
+            window.yomichan_orphaned = true;
             reject(e.message);
         }
     });
 }
-
-function bgOptionsGet() {
-    return bgInvoke('optionsGet', {});
-}
-
-function bgTermsFind(text) {
-    return bgInvoke('termsFind', {text});
-}
-
-function bgKanjiFind(text) {
-    return bgInvoke('kanjiFind', {text});
-}
-
-function bgTemplateRender(template, data) {
-    return bgInvoke('templateRender', {data, template});
-}
-
-function bgDefinitionsAddable(definitions, modes) {
-    return bgInvoke('definitionsAddable', {definitions, modes}).catch(() => null);
-}
-
-function bgDefinitionAdd(definition, mode) {
-    return bgInvoke('definitionAdd', {definition, mode});
-}
-
-
-/*
- * Document
- */
-
-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};
-}
-
-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.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;
-}
-
-function docImposterDestroy() {
-    for (const element of document.getElementsByClassName('yomichan-imposter')) {
-        element.parentNode.removeChild(element);
-    }
-}
-
-function docRangeFromPoint(point) {
-    const element = document.elementFromPoint(point.x, point.y);
-    if (element !== null) {
-        if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
-            return new TextSourceElement(element);
-        } else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
-            docImposterCreate(element);
-        }
-    }
-
-    if (!document.caretRangeFromPoint) {
-        document.caretRangeFromPoint = (x, y) => {
-            const position = document.caretPositionFromPoint(x,y);
-            if (position === null) {
-                return null;
-            }
-
-            const range = document.createRange();
-            range.setStart(position.offsetNode, position.offset);
-            range.setEnd(position.offsetNode, position.offset);
-            return range;
-        };
-    }
-
-    const range = document.caretRangeFromPoint(point.x, point.y);
-    if (range !== null) {
-        return new TextSourceRange(range);
-    }
-
-    return null;
-}
-
-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
-    };
-}