Get last mapping if line matches but column is way bigger

Author: mstoykov

consumer.go

@@ -192,19 +192,24 @@ func (c *Consumer) source(
 return int(m.genLine) >= genLine
 })
 
-// Mapping not found.
+var match *mapping
+// Mapping not found
 if i == len(m.mappings) {
-return
-}
-
-match := &m.mappings[i]
-
-// Fuzzy match.
-if int(match.genLine) > genLine || int(match.genColumn) > genColumn {
-if i == 0 {
+// lets see if the line is correct but the column is bigger
+match = &m.mappings[i-1]
+if int(match.genLine) != genLine {
 return
 }
-match = &m.mappings[i-1]
+} else {
+match = &m.mappings[i]
+
+// Fuzzy match.
+if int(match.genLine) > genLine || int(match.genColumn) > genColumn {
+if i == 0 {
+return
+}
+match = &m.mappings[i-1]
+}
 }
 
 if match.sourcesInd >= 0 {

consumer_test.go

@@ -96,6 +96,9 @@ func testSourceMap(t *testing.T, json string) {
 {2, 21, "/the/root/two.js", "", 2, 3},
 {2, 28, "/the/root/two.js", "n", 2, 10},
 
+// line correct, column bigger than last mapping
+{2, 29, "/the/root/two.js", "n", 2, 10},
+
 // Fuzzy match.
 {1, 20, "/the/root/one.js", "bar", 1, 21},
 {1, 30, "/the/root/one.js", "baz", 2, 10},