fix deletion by key with leading space

Author: daria-kay

parser.go

@@ -49,10 +49,10 @@ func findTokenStart(data []byte, token byte) int {
 }
 
 func findKeyStart(data []byte, key string) (int, error) {
-	i := 0
+	i := nextToken(data)
 	ln := len(data)
-	if ln > 0 && (data[0] == '{' || data[0] == '[') {
-		i = 1
+	if ln > 0 && (data[i] == '{' || data[i] == '[') {
+		i += 1
 	}
 	var stackbuf [unescapeStackBufSize]byte // stack-allocated array for allocation-free unescaping of small strings
 

parser_test.go

@@ -221,6 +221,12 @@ var deleteTests = []DeleteTest{
 		path: []string{""},
 		data: `^_�^C^A^@{`,
 	},
+	{
+		desc: "Issue #150: leading space",
+		json: `   {"test":"input"}`,
+		path: []string{"test"},
+		data: `   {}`,
+	},
 }
 
 var setTests = []SetTest{
@@ -989,15 +995,15 @@ var getStringTests = []GetTest{
 		isErr: true,
 	},
 	{
-		desc:  `empty array index`,
-		json:  `[""]`,
-		path:  []string{"[]"},
+		desc:    `empty array index`,
+		json:    `[""]`,
+		path:    []string{"[]"},
 		isFound: false,
 	},
 	{
-		desc:  `malformed array index`,
-		json:  `[""]`,
-		path:  []string{"["},
+		desc:    `malformed array index`,
+		json:    `[""]`,
+		path:    []string{"["},
 		isFound: false,
 	},
 }