Fix for #317

* [FIXED] Issue where invalid rows were not accounted for when skipRows was set #317

History.md

@@ -1,3 +1,7 @@
+# v4.0.3
+
+* [FIXED] Issue where invalid rows were not accounted for when skipRows was set [#317](https://github.com/C2FO/fast-csv/issues/317)
+
 # v4.0.2
 
 * [ADDED] `writeHeaders` to `@fast-csv/format` option to prevent writing headers.

packages/parse/__tests__/CsvParsingStream.spec.ts

@@ -369,6 +369,21 @@ describe('CsvParserStream', () => {
                     expected,
                 );
             });
+
+            describe('strict column handling', () => {
+                it('should include the invalid rows when counting rows to skip', async () => {
+                    const expectedRows = withHeadersAndMissingColumns.parsed;
+                    await expectParsed(
+                        parseContentAndCollect(withHeadersAndMissingColumns, {
+                            headers: true,
+                            strictColumnHandling: true,
+                            skipRows: 2,
+                        }),
+                        expectedRows.slice(-1),
+                        [],
+                    );
+                });
+            });
         });
 
         describe('without headers', () => {

packages/parse/__tests__/issues/issue317.spec.ts

@@ -0,0 +1,29 @@
+import { EOL } from 'os';
+import { parseString, RowMap, RowArray } from '../../src';
+
+describe('Issue #317 - https://github.com/C2FO/fast-csv/issues/317', () => {
+    const CSV_CONTENT = ['header1,header2', 'col1', 'col2,col2', 'col3', 'col4,col4', 'col5,col5', 'col6,col6'].join(
+        EOL,
+    );
+    const expectedInvalidRows = [['col3']];
+    const expectedRows = [
+        { header1: 'col4', header2: 'col4' },
+        { header1: 'col5', header2: 'col5' },
+        { header1: 'col6', header2: 'col6' },
+    ];
+
+    it('skip trailing whitespace after a quoted field', done => {
+        const invalid: RowArray[] = [];
+        const rows: RowMap[] = [];
+        parseString(CSV_CONTENT, { headers: true, skipRows: 2, strictColumnHandling: true, maxRows: 4 })
+            .on('data-invalid', (row: RowArray) => invalid.push(row))
+            .on('data', (r: RowMap) => rows.push(r))
+            .on('error', done)
+            .on('end', (count: number) => {
+                expect(rows).toEqual(expectedRows);
+                expect(invalid).toEqual(expectedInvalidRows);
+                expect(count).toBe(expectedRows.length + invalid.length);
+                done();
+            });
+    });
+});

packages/parse/src/CsvParserStream.ts

@@ -163,15 +163,18 @@ export class CsvParserStream<I extends Row, O extends Row> extends Transform {
                     return cb(new Error('Expected result from header transform'));
                 }
                 if (!withHeaders.isValid) {
-                    return cb(null, { isValid: false, row: (parsedRow as never) as O });
+                    if (this.shouldEmitRows) {
+                        return cb(null, { isValid: false, row: (parsedRow as never) as O });
+                    }
+                    // skipped because of skipRows option remove from total row count
+                    return this.skipRow(cb);
                 }
                 if (withHeaders.row) {
                     if (this.shouldEmitRows) {
                         return this.rowTransformerValidator.transformAndValidate(withHeaders.row, cb);
                     }
                     // skipped because of skipRows option remove from total row count
-                    this.rowCount -= 1;
-                    return cb(null, { row: null, isValid: true });
+                    return this.skipRow(cb);
                 }
                 // this is a header row dont include in the rowCount or parsedRowCount
                 this.rowCount -= 1;
@@ -183,6 +186,12 @@ export class CsvParserStream<I extends Row, O extends Row> extends Transform {
         }
     }
 
+    private skipRow(cb: RowValidatorCallback<O>): void {
+        // skipped because of skipRows option remove from total row count
+        this.rowCount -= 1;
+        return cb(null, { row: null, isValid: true });
+    }
+
     private pushRow(row: Row, cb: (err?: Error) => void): void {
         try {
             if (!this.parserOptions.objectMode) {