Parser tests now show exact line and column where data is mismatched

parser/parser_test.go

@@ -7,6 +7,7 @@ import "testing"
 func checkTree (modulePath string, correct string, test *testing.T) {
 	tree, err  := Parse(modulePath)
 	treeString := tree.ToString(0)
+	treeRunes  := []rune(treeString)
 	
 	test.Log("CORRECT TREE:")
 	test.Log(correct)
@@ -20,11 +21,46 @@ func checkTree (modulePath string, correct string, test *testing.T) {
 		return
 	}
 
-	if treeString != correct {
-		test.Log("trees not equal!")
+	equal  := true
+	line   := 0
+	column := 0
+
+	for index, correctChar := range correct {
+		if index >= len(treeRunes) {			
+			test.Log (
+				"parsed is too short at line", line + 1,
+				"col", column + 1)
 			test.Fail()
 			return
 		}
+		
+		if correctChar != treeRunes[index] {		
+			test.Log (
+				"trees not equal at line", line + 1,
+				"col", column + 1)
+			test.Log("correct: [" + string(correctChar) + "]")
+			test.Log("got:     [" + string(treeRunes[index]) + "]")
+			test.Fail()
+			return
+		}
+
+		if correctChar == '\n' {
+			line ++
+			column = 0
+		} else {
+			column ++
+		}
+	}
+	
+	if len(treeString) > len(correct) {
+		test.Log("parsed is too long")
+		test.Fail()
+		return
+	}
+
+	if !equal {
+		return
+	}
 }
 
 func TestMeta (test *testing.T) {