Prevent JS source map builder from inserting overlapping mappings

Check if newly inserted mapping is in the same position within JS line and in this case omit the mapping
2017-05-23 12:18:33 +03:00
parent 174068c462
commit ca738a9536
1 changed files with 9 additions and 4 deletions
@@ -127,14 +127,19 @@ public class SourceMap3Builder implements SourceMapBuilder {

    @Override
    public void addMapping(String source, int sourceLine, int sourceColumn) {
-        if (previousGeneratedColumn == -1) {
+        boolean newGroupStarted = previousGeneratedColumn == -1;
+        if (newGroupStarted) {
            previousGeneratedColumn = 0;
        }
-        else {
-            out.append(',');
-        }

        int columnDiff = textOutput.getColumn() - previousGeneratedColumn;
+        if (!newGroupStarted && columnDiff == 0) {
+            return;
+        }
+        if (!newGroupStarted) {
+            out.append(',');
+        }
+
        // TODO fix sections overlapping
        // assert columnDiff != 0;
        Base64VLQ.encode(out, columnDiff);