From 9de0d34af398b385e140a365a500ff20dda45a7a Mon Sep 17 00:00:00 2001
From: Alex Yatskov <alex@foosoft.net>
Date: Mon, 27 Mar 2017 22:48:50 -0700
Subject: [PATCH] wip

---
 ext/fg/js/driver.js |  8 ++++----
 ext/fg/js/util.js   | 18 ++++++++++++++----
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/ext/fg/js/driver.js b/ext/fg/js/driver.js
index 2324e6b2..5191f18d 100644
--- a/ext/fg/js/driver.js
+++ b/ext/fg/js/driver.js
@@ -168,13 +168,13 @@ window.driver = new class {
             } else {
                 textSource.setEndOffset(length);
 
-                const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
+                const cloze = docClozeExtract(textSource, this.options.anki.sentenceExt);
                 const url = window.location.href;
                 this.popup.showTermDefs(
                     textSource.getRect(),
                     definitions,
                     this.options,
-                    {sentence, url}
+                    {cloze, url}
                 );
 
                 this.lastTextSource = textSource;
@@ -194,13 +194,13 @@ window.driver = new class {
             if (definitions.length === 0) {
                 return false;
             } else {
-                const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
+                const cloze = docClozeExtract(textSource, this.options.anki.sentenceExt);
                 const url = window.location.href;
                 this.popup.showKanjiDefs(
                     textSource.getRect(),
                     definitions,
                     this.options,
-                    {sentence, url}
+                    {cloze, url}
                 );
 
                 this.lastTextSource = textSource;
diff --git a/ext/fg/js/util.js b/ext/fg/js/util.js
index be809bfb..0a95b24d 100644
--- a/ext/fg/js/util.js
+++ b/ext/fg/js/util.js
@@ -152,7 +152,7 @@ function docRangeFromPoint(point, imposter) {
     return null;
 }
 
-function docSentenceExtract(source, extent) {
+function docClozeExtract(source, extent) {
     const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
     const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
     const terminators = '…。．.？?！!';
@@ -182,8 +182,8 @@ function docSentenceExtract(source, extent) {
 
     quoteStack = [];
 
-    let endPos = content.length;
-    for (let i = position; i < endPos; ++i) {
+    let endPos = content.length - 1;
+    for (let i = position; i <= endPos; ++i) {
         const c = content[i];
 
         if (quoteStack.length === 0) {
@@ -204,5 +204,15 @@ function docSentenceExtract(source, extent) {
         }
     }
 
-    return content.substring(startPos, endPos).trim();
+    const sentence = content.substring(startPos, endPos);
+    const clozePrefix = sentence.substring(0, position - startPos);
+    const clozeBody = source.text();
+    const clozeSuffix = sentence.substring(position - startPos + clozeBody.length);
+
+    return {
+        sentence: sentence.trim(),
+        prefix: clozePrefix.trim(),
+        body: clozeBody.trim(),
+        sufix: clozeSuffix.trim()
+    };
 }