fix: properly escape quotes when using excel mode

lib/JSON2CSVBase.js

@@ -172,10 +172,10 @@ class JSON2CSVBase {
         value = value.replace(new RegExp(this.opts.quote, 'g'), this.opts.escapedQuote);
       }
 
-      value = `${this.opts.quote}${value}${this.opts.quote}`;
-
       if (this.opts.excelStrings) {
-        value = `"="${value}""`;
+        value = `"=""${value.replace(new RegExp(this.opts.quote, 'g'), this.opts.escapedQuote)}"""`;
+      } else {
+        value = `${this.opts.quote}${value}${this.opts.quote}`;
       }
     }
 

test/CLI.js

@@ -443,6 +443,17 @@ module.exports = (testRunner, jsonFixtures, csvFixtures) => {
     });
   });
 
+  testRunner.add('should format strings to force excel to view the values as strings with escaped quotes', (t) => {
+    const opts = '--excel-strings';
+
+    exec(`${cli} -i "${getFixturePath('/json/quotes.json')}" ${opts}`, (err, stdout, stderr) => {
+      t.notOk(stderr); 
+      const csv = stdout;
+      t.equal(csv, csvFixtures.excelStringsWithEscapedQuoted);
+      t.end();
+    });
+  });
+
   // Escaping and preserving values
 
   testRunner.add('should parse JSON values with trailing backslashes', (t) => {

test/JSON2CSVAsyncParser.js

@@ -787,6 +787,22 @@ module.exports = (testRunner, jsonFixtures, csvFixtures, inMemoryJsonFixtures) =
     t.end();
   });
 
+  testRunner.add('should format strings to force excel to view the values as strings with escaped quotes', async (t) => {
+    const opts = {
+      excelStrings:true
+    };
+    const parser = new AsyncParser(opts);
+
+    try {
+      const csv = await parser.fromInput(jsonFixtures.quotes()).promise();
+      t.equal(csv, csvFixtures.excelStringsWithEscapedQuoted);
+    } catch(err) {
+      t.fail(err.message);
+    }
+
+    t.end();
+  });
+
   // Escaping and preserving values
 
   testRunner.add('should parse JSON values with trailing backslashes', async (t) => {

test/JSON2CSVParser.js

@@ -530,6 +530,18 @@ module.exports = (testRunner, jsonFixtures, csvFixtures) => {
     t.end();
   });
 
+  testRunner.add('should format strings to force excel to view the values as strings with escaped quotes', (t) => {
+    const opts = {
+      excelStrings:true
+    };
+
+    const parser = new Json2csvParser(opts);
+    const csv = parser.parse(jsonFixtures.quotes);
+
+    t.equal(csv, csvFixtures.excelStringsWithEscapedQuoted);
+    t.end();
+  });
+
   // Escaping and preserving values
 
   testRunner.add('should parse JSON values with trailing backslashes', (t) => {

test/JSON2CSVTransform.js

@@ -866,6 +866,27 @@ module.exports = (testRunner, jsonFixtures, csvFixtures, inMemoryJsonFixtures) =
       });
   });
 
+  testRunner.add('should format strings to force excel to view the values as strings with escaped quotes', (t) => {
+    const opts = {
+      excelStrings:true
+    };
+
+    const transform = new Json2csvTransform(opts);
+    const processor = jsonFixtures.quotes().pipe(transform);
+
+    let csv = '';
+    processor
+      .on('data', chunk => (csv += chunk.toString()))
+      .on('end', () => {
+        t.equal(csv, csvFixtures.excelStringsWithEscapedQuoted);
+        t.end();
+      })
+      .on('error', err => {
+        t.fail(err.message);
+        t.end();  
+      });
+  });
+
   // Escaping and preserving values
 
   testRunner.add('should parse JSON values with trailing backslashes', (t) => {

test/fixtures/csv/excelStringsWithEscapedQuoted.csv

@@ -0,0 +1,3 @@
+"=""a string"""
+"=""with a description"""
+"=""with a description and """"quotes"""""""