From 25bc86c3ce44bd7823d0d924e86969310c14dc8c Mon Sep 17 00:00:00 2001
From: siikamiika <siikamiika@users.noreply.github.com>
Date: Mon, 13 Apr 2020 22:14:23 +0300
Subject: [PATCH] force empty mecab output properties to strings

---
 ext/bg/js/mecab.js | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/ext/bg/js/mecab.js b/ext/bg/js/mecab.js
index cd6e6c57..597dceae 100644
--- a/ext/bg/js/mecab.js
+++ b/ext/bg/js/mecab.js
@@ -40,7 +40,36 @@ class Mecab {
     }
 
     async parseText(text) {
-        return await this.invoke('parse_text', {text});
+        const rawResults = await this.invoke('parse_text', {text});
+        // {
+        //     'mecab-name': [
+        //         // line1
+        //         [
+        //             {str expression: 'expression', str reading: 'reading', str source: 'source'},
+        //             {str expression: 'expression2', str reading: 'reading2', str source: 'source2'}
+        //         ],
+        //         line2,
+        //         ...
+        //     ],
+        //     'mecab-name2': [...]
+        // }
+        const results = {};
+        for (const [mecabName, parsedLines] of Object.entries(rawResults)) {
+            const result = [];
+            for (const parsedLine of parsedLines) {
+                const line = [];
+                for (const {expression, reading, source} of parsedLine) {
+                    line.push({
+                        expression: expression || '',
+                        reading: reading || '',
+                        source: source || ''
+                    });
+                }
+                result.push(line);
+            }
+            results[mecabName] = result;
+        }
+        return results;
     }
 
     startListener() {