rfc

Author: leonchen83

src/main/java/com/redislabs/modules/rejson/Path.java

@@ -32,9 +32,9 @@
  * Path is a ReJSON path, representing a valid path into an object
  */
 public class Path {
-	
-	public static final Path ROOT_PATH = new Path(".");
-	
+    
+    public static final Path ROOT_PATH = new Path(".");
+    
     private final String strPath;
 
     public Path(final String strPath) {
@@ -77,20 +77,25 @@ public int hashCode() {
         return strPath.hashCode();
     }
 
+    private static String escape(String path) {
+        StringBuilder builder = new StringBuilder();
+        builder.append('"');
+        builder.append(path);
+        builder.append('"');
+        return builder.toString();
+    }
+    
     private static String parse(String path) {
         if (path == null) {
             throw new NullPointerException("Json Pointer Path cannot be null.");
         }
         if (path.isEmpty()) {
-            throw new IllegalArgumentException("Json Pointer Path cannot be empty.");
+            // ”“ means all document 
+            return ROOT_PATH.toString();
         }
         if (path.charAt(0) != '/') {
             throw new IllegalArgumentException("Json Pointer Path must start with '/'.");
         }
-        if (path.length() == 1) {
-            // only contains '/'
-            return ROOT_PATH.toString();
-        }
         char[] ary = path.toCharArray();
         StringBuilder r = new StringBuilder(ary.length);
         StringBuilder builder = new StringBuilder();
@@ -113,7 +118,7 @@ private static String parse(String path) {
                 if (builder.length() > 0 && num) {
                     r.append(".[" + builder.toString() + "]");
                 } else {
-                    r.append("." + builder.toString());
+                    r.append(".[" + escape(builder.toString()) + "]");
                 }
                 num = true;
                 builder.setLength(0);
@@ -155,8 +160,10 @@ private static String parse(String path) {
             if (num) {
                 r.append(".[" + builder.toString() + "]");
             } else {
-                r.append("." + builder.toString());
+                r.append(".[" + escape(builder.toString()) + "]");
             }
+        } else if (prev == '/') {
+            r.append(".[" + escape(builder.toString()) + "]");
         }
         return r.toString();
     }

src/test/java/com/redislabs/modules/rejson/PathTest.java

@@ -34,19 +34,35 @@ public void testPathHashCode() {
 
     @Test
     public void testJsonPointer() {
-        assertEquals(Path.ofJsonPointer("/"), Path.ROOT_PATH);
-        assertEquals(Path.ofJsonPointer("/a/b/c"), Path.of(".a.b.c"));
-        assertEquals(Path.ofJsonPointer("/a/0/c"), Path.of(".a.[0].c"));
-        assertEquals(Path.ofJsonPointer("/a/0b/c"), Path.of(".a.0b.c"));
-        assertEquals(Path.ofJsonPointer("/ab/cd/1010"), Path.of(".ab.cd.[1010]"));
-        assertEquals(Path.ofJsonPointer("/a/b/c").hashCode(), Path.of(".a.b.c").hashCode());
+        assertEquals(Path.ofJsonPointer(""), Path.ROOT_PATH);
+        assertEquals(Path.ofJsonPointer("/"), Path.of(".[\"\"]"));
+        assertEquals(Path.ofJsonPointer("//0"), Path.of(".[\"\"].[0]"));
+        assertEquals(Path.ofJsonPointer("//"), Path.of(".[\"\"].[\"\"]"));
+        assertEquals(Path.ofJsonPointer("// "), Path.of(".[\"\"].[\" \"]"));
+        assertEquals(Path.ofJsonPointer("/a/b/c"), Path.of(".[\"a\"].[\"b\"].[\"c\"]"));
+        assertEquals(Path.ofJsonPointer("/a/0/c"), Path.of(".[\"a\"].[0].[\"c\"]"));
+        assertEquals(Path.ofJsonPointer("/a/0b/c"), Path.of(".[\"a\"].[\"0b\"].[\"c\"]"));
+        assertEquals(Path.ofJsonPointer("/ab/cd/1010"), Path.of(".[\"ab\"].[\"cd\"].[1010]"));
+        assertEquals(Path.ofJsonPointer("/a/b/c").hashCode(), Path.of(".[\"a\"].[\"b\"].[\"c\"]").hashCode());
 
-        //escape test
-        assertEquals(Path.ofJsonPointer("/a/~0/c"), Path.of(".a.~.c"));
-        assertEquals(Path.ofJsonPointer("/a/~1/c"), Path.of(".a./.c"));
-        assertEquals(Path.ofJsonPointer("/a/~~/c"), Path.of(".a.~~.c"));
-        assertEquals(Path.ofJsonPointer("/~/~~~/~~"), Path.of(".~.~~~.~~"));
-        assertEquals(Path.ofJsonPointer("/~/~~~0/~~"), Path.of(".~.~~~.~~"));
-        assertEquals(Path.ofJsonPointer("/~/'.'/~~"), Path.of(".~.'.'.~~"));
+        // escape test
+        assertEquals(Path.ofJsonPointer("/a/~0"), Path.of(".[\"a\"].[\"~\"]"));
+        assertEquals(Path.ofJsonPointer("/a/~1"), Path.of(".[\"a\"].[\"/\"]"));
+        assertEquals(Path.ofJsonPointer("/a/~0/c"), Path.of(".[\"a\"].[\"~\"].[\"c\"]"));
+        assertEquals(Path.ofJsonPointer("/a/~1/c"), Path.of(".[\"a\"].[\"/\"].[\"c\"]"));
+        assertEquals(Path.ofJsonPointer("/a/~~/c"), Path.of(".[\"a\"].[\"~~\"].[\"c\"]"));
+        assertEquals(Path.ofJsonPointer("/~/~~~/~"), Path.of(".[\"~\"].[\"~~~\"].[\"~\"]"));
+        assertEquals(Path.ofJsonPointer("/~/~~~/~~"), Path.of(".[\"~\"].[\"~~~\"].[\"~~\"]"));
+        assertEquals(Path.ofJsonPointer("/~/~~~0/~~"), Path.of(".[\"~\"].[\"~~~\"].[\"~~\"]"));
+        assertEquals(Path.ofJsonPointer("/~/'.'/~~"), Path.of(".[\"~\"].[\"'.'\"].[\"~~\"]"));
+        
+        // json path escape test
+        assertEquals(Path.ofJsonPointer("/\t"), Path.of(".[\"\t\"]"));
+        assertEquals(Path.ofJsonPointer("/\u0074"), Path.of(".[\"\u0074\"]"));
+        assertEquals(Path.ofJsonPointer("/'"), Path.of(".[\"'\"]"));
+        assertEquals(Path.ofJsonPointer("/\'"), Path.of(".[\"\'\"]"));
+        assertEquals(Path.ofJsonPointer("/\""), Path.of(".[\"\"\"]"));
+        assertEquals(Path.ofJsonPointer("/\n"), Path.of(".[\"\n\"]"));
+        assertEquals(Path.ofJsonPointer("/\\"), Path.of(".[\"\\\"]"));
     }
 }