Fix in json parser (#358)

- added testFormatting6-8 covering the issue, fix in CLParser
- added iterator for CLObject

Author: camaelon

constraintlayout/core/src/main/java/androidx/constraintlayout/core/parser/CLContainer.java

@@ -64,9 +64,11 @@ public ArrayList<String> names() {
 
   public boolean has(String name) {
     for (CLElement element : mElements) {
-      CLKey key = (CLKey) element;
-      if (key.content().equals(name)) {
-        return true;
+      if (element instanceof CLKey) {
+        CLKey key = (CLKey) element;
+        if (key.content().equals(name)) {
+          return true;
+        }
       }
     }
     return false;

constraintlayout/core/src/main/java/androidx/constraintlayout/core/parser/CLKey.java

@@ -48,6 +48,8 @@ public static CLElement allocate(String name, CLElement value) {
     return key;
   }
 
+  public String getName() { return content(); }
+
   protected String toJSON() {
     if (mElements.size() > 0) {
       return getDebugName() + content() + ": " + mElements.get(0).toJSON();

constraintlayout/core/src/main/java/androidx/constraintlayout/core/parser/CLObject.java

@@ -15,7 +15,9 @@
  */
 package androidx.constraintlayout.core.parser;
 
-public class CLObject extends CLContainer {
+import java.util.Iterator;
+
+public class CLObject extends CLContainer implements Iterable<CLKey>{
 
   public CLObject(char[] content) {
     super(content);
@@ -62,4 +64,28 @@ public String toFormattedJSON(int indent, int forceIndent) {
     return json.toString();
   }
 
+  @Override
+  public Iterator iterator() {
+    return new CLObjectIterator(this);
+  }
+
+  private class CLObjectIterator implements Iterator {
+    CLObject myObject;
+    int index = 0;
+    public CLObjectIterator(CLObject clObject) {
+      myObject = clObject;
+    }
+
+    @Override
+    public boolean hasNext() {
+      return index < myObject.size();
+    }
+
+    @Override
+    public Object next() {
+      CLKey key = (CLKey) myObject.mElements.get(index);
+      index++;
+      return key;
+    }
+  }
 }

constraintlayout/core/src/main/java/androidx/constraintlayout/core/parser/CLParser.java

@@ -124,6 +124,10 @@ public CLObject parse() throws CLParsingException {
             if (c == '}' || c == ']') {
               currentElement = currentElement.getContainer();
               currentElement.setEnd(i - 1);
+              if (currentElement instanceof CLKey) {
+                currentElement = currentElement.getContainer();
+                currentElement.setEnd(i - 1);
+              }
             }
           }
         }

constraintlayout/core/src/test/java/androidx/constraintlayout/core/parser/CLParserTest.java

@@ -680,6 +680,63 @@ public void testFormatting5() {
             e.printStackTrace();
         }
     }
+
+    @Test
+    public void testFormatting6() {
+        String test = "{ root: {interpolated: {left: 0, top: 0, right: 800, bottom: 772}}, " +
+                "button: {interpolated: {left: 0, top: 372, right: 800, bottom: 401}}, " +
+                "text1: {interpolated: {left: 100, top: 285, right: 208, bottom: 301}}, " +
+                "text2: {interpolated: {left: 723, top: 736, right: 780, bottom: 752}}, " +
+                "g1: {type: 'vGuideline',interpolated: {left: 100, top: 0, right: 100, bottom: 772}}, }";
+        try {
+            CLObject parsedContent = CLParser.parse(test);
+            assertEquals("{\n" +
+                    "  root: { interpolated: { left: 0, top: 0, right: 800, bottom: 772 } },\n" +
+                    "  button: { interpolated: { left: 0, top: 372, right: 800, bottom: 401 } },\n" +
+                    "  text1: { interpolated: { left: 100, top: 285, right: 208, bottom: 301 } },\n" +
+                    "  text2: { interpolated: { left: 723, top: 736, right: 780, bottom: 752 } },\n" +
+                    "  g1: {\n" +
+                    "    type: 'vGuideline',\n" +
+                    "    interpolated: { left: 100, top: 0, right: 100, bottom: 772 }\n" +
+                    "  }\n" +
+                    "}", parsedContent.toFormattedJSON());
+        } catch (CLParsingException e) {
+            System.err.println("Exception " + e.reason());
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void testFormatting7() {
+        String test = "{ root: {left: 0, top: 0, right: 800, bottom: 772}, " +
+                "button: {left: 0, top: 372, right: 800, bottom: 401}, ";
+        try {
+            CLObject parsedContent = CLParser.parse(test);
+            assertEquals("{\n" +
+                    "  root: { left: 0, top: 0, right: 800, bottom: 772 },\n" +
+                    "  button: { left: 0, top: 372, right: 800, bottom: 401 }\n" +
+                    "}", parsedContent.toFormattedJSON());
+        } catch (CLParsingException e) {
+            System.err.println("Exception " + e.reason());
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void testFormatting8() {
+        String test = "{ root: { bottom: 772}, " +
+                "button: { bottom: 401 }, ";
+        try {
+            CLObject parsedContent = CLParser.parse(test);
+            assertEquals("{\n" +
+                    "  root: { bottom: 772 },\n" +
+                    "  button: { bottom: 401 }\n" +
+                    "}", parsedContent.toFormattedJSON());
+        } catch (CLParsingException e) {
+            System.err.println("Exception " + e.reason());
+            e.printStackTrace();
+        }
+    }
 }