Text source element scanning improvements (#1464)

* Add api.textHasJapaneseCharacters

* Add support for empty query

* Add support for showing the query parser for TextSourceElement
with content that does not start with Japanese text

1 files changed, 15 insertions, 0 deletions

diff --git a/ext/js/language/text-scanner.js b/ext/js/language/text-scanner.js
index 073b1a6c..4994faea 100644
--- a/ext/js/language/text-scanner.js
+++ b/ext/js/language/text-scanner.js
@@ -17,6 +17,7 @@
 
 /* global
  * DocumentUtil
+ * TextSourceElement
  */
 
 class TextScanner extends EventDispatcher {
@@ -321,6 +322,12 @@ class TextScanner extends EventDispatcher {
                 ({definitions, sentence, type} = result);
                 this._inputInfoCurrent = inputInfo;
                 this.setCurrentTextSource(textSource);
+            } else if (textSource instanceof TextSourceElement && await this._hasJapanese(textSource.fullContent)) {
+                definitions = [];
+                sentence = {sentence: '', offset: 0};
+                type = 'terms';
+                this._inputInfoCurrent = inputInfo;
+                this.setCurrentTextSource(textSource);
             }
         } catch (e) {
             error = e;
@@ -978,4 +985,12 @@ class TextScanner extends EventDispatcher {
             }
         }
     }
+
+    async _hasJapanese(text) {
+        try {
+            return await yomichan.api.textHasJapaneseCharacters(text);
+        } catch (e) {
+            return false;
+        }
+    }
 }