Required strings to be quoted even in lenient mode.

As far as Inderjeet and I can tell, this is consistent with Gson 1.5.

gson/src/main/java/com/google/gson/Gson.java

@@ -17,9 +17,7 @@
 package com.google.gson;
 
 import com.google.gson.stream.JsonReader;
-import com.google.gson.stream.JsonToken;
 import com.google.gson.stream.JsonWriter;
-import com.google.gson.stream.MalformedJsonException;
 
 import java.io.IOException;
 import java.io.Reader;
@@ -457,7 +455,6 @@ public final class Gson {
   public <T> T fromJson(Reader json, Class<T> classOfT) throws JsonSyntaxException, JsonIOException {
     JsonReader jsonReader = new JsonReader(json);
     Object object = fromJson(jsonReader, classOfT);
-    assertFullConsumption(object, jsonReader);
     return Primitives.wrap(classOfT).cast(object);
   }
 
@@ -482,21 +479,7 @@ public final class Gson {
    */
   public <T> T fromJson(Reader json, Type typeOfT) throws JsonIOException, JsonSyntaxException {
     JsonReader jsonReader = new JsonReader(json);
-    T object = this.<T>fromJson(jsonReader, typeOfT);
-    assertFullConsumption(object, jsonReader);
-    return object;
-  }
-
-  private static void assertFullConsumption(Object obj, JsonReader reader) {
-    try {
-      if (obj != null && reader.peek() != JsonToken.END_DOCUMENT) {
-        throw new JsonIOException("JSON document was not fully consumed.");
-      }
-    } catch (MalformedJsonException e) {
-      throw new JsonSyntaxException(e);
-    } catch (IOException e) {
-      throw new JsonIOException(e);
-    }
+    return this.<T>fromJson(jsonReader, typeOfT);
   }
 
   /**

gson/src/main/java/com/google/gson/JsonParser.java

@@ -16,11 +16,8 @@
 package com.google.gson;
 
 import com.google.gson.stream.JsonReader;
-import com.google.gson.stream.JsonToken;
-import com.google.gson.stream.MalformedJsonException;
 
 import java.io.EOFException;
-import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
 
@@ -54,20 +51,8 @@ public final class JsonParser {
    * @since 1.3
    */
   public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException {
-    try {
-      JsonReader jsonReader = new JsonReader(json);
-      JsonElement element = parse(jsonReader);
-      if (!element.isJsonNull() && jsonReader.peek() != JsonToken.END_DOCUMENT) {
-        throw new JsonSyntaxException("Did not consume the entire document.");
-      }
-      return element;
-    } catch (MalformedJsonException e) {
-      throw new JsonSyntaxException(e);
-    } catch (IOException e) {
-      throw new JsonIOException(e);
-    } catch (NumberFormatException e) {
-      throw new JsonSyntaxException(e);
-    }
+    JsonReader jsonReader = new JsonReader(json);
+    return parse(jsonReader);
   }
 
   /**
@@ -75,6 +60,7 @@ public final class JsonParser {
    *
    * @throws JsonParseException if there is an IOException or if the specified
    *     text is not valid JSON
+   * @since 1.6
    */
   public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException {
     boolean lenient = json.isLenient();

gson/src/main/java/com/google/gson/stream/JsonReader.java

@@ -402,17 +402,17 @@ public final class JsonReader implements Closeable {
     // fast forward through the leading whitespace
     nextNonWhitespace();
     pos--;
-    
+
     if (pos + NON_EXECUTE_PREFIX.length > limit && !fillBuffer(NON_EXECUTE_PREFIX.length)) {
       return;
     }
-    
+
     for (int i = 0; i < NON_EXECUTE_PREFIX.length; i++) {
       if (buffer[pos + i] != NON_EXECUTE_PREFIX[i]) {
         return; // not a security token!
       }
     }
-    
+
     // we consumed a security token!
     pos += NON_EXECUTE_PREFIX.length;
   }
@@ -1097,8 +1097,7 @@ public final class JsonReader implements Closeable {
         token = JsonToken.NUMBER;
       } catch (NumberFormatException ignored) {
         // this must be an unquoted string
-        checkLenient();
-        token = JsonToken.STRING;
+        throw syntaxError("invalid number or unquoted string");
       }
     }
   }

gson/src/test/java/com/google/gson/JsonParserTest.java

@@ -39,6 +39,20 @@ public class JsonParserTest extends TestCase {
     parser = new JsonParser();
   }
 
+  public void testParseSingleWordFails() {
+    try {
+      parser.parse("Word");
+      fail();
+    } catch (JsonSyntaxException expected) {}
+  }
+
+  public void testParseUnquotedStringArrayFails() {
+    try {
+      parser.parse("[a,b,c]");
+      fail();
+    } catch (JsonSyntaxException expected) {}
+  }
+
   public void testParseString() {
     String json = "{a:10,b:'c'}";
     JsonElement e = parser.parse(json);
@@ -58,7 +72,14 @@ public class JsonParserTest extends TestCase {
     assertTrue(e.isJsonNull());
   }
 
-  public void testParseUnquotedStringSentence() {
+  public void testParseUnquotedSingleWordStringFails() {
+    try {
+      parser.parse("Test");
+      fail();
+    } catch (JsonSyntaxException expected) { }
+  }
+
+  public void testParseUnquotedMultiWordStringFails() {
     String unquotedSentence = "Test is a test..blah blah";
     try {
       parser.parse(unquotedSentence);

gson/src/test/java/com/google/gson/functional/PrimitiveTest.java

@@ -571,7 +571,12 @@ public class PrimitiveTest extends TestCase {
     assertEquals(value, actual);
   }
 
-  public void testUnquotedStringDeserialization() throws Exception {
+  public void testUnquotedStringDeserializationFails() throws Exception {
+    try {
+      gson.fromJson("UnquotedSingleWord", String.class);
+      fail();
+    } catch (JsonSyntaxException expected) { }
+
     String value = "String Blah Blah Blah...1, 2, 3";
     try {
       gson.fromJson(value, String.class);

gson/src/test/java/com/google/gson/stream/JsonReaderTest.java

@@ -557,7 +557,7 @@ public final class JsonReaderTest extends TestCase {
     try {
       reader.nextString();
       fail();
-    } catch (IOException expected) {
+    } catch (MalformedJsonException expected) {
     }
   }
 
@@ -565,7 +565,10 @@ public final class JsonReaderTest extends TestCase {
     JsonReader reader = new JsonReader(new StringReader("[a]"));
     reader.setLenient(true);
     reader.beginArray();
-    assertEquals("a", reader.nextString());
+    try {
+      reader.nextString();
+      fail();
+    } catch (MalformedJsonException expected) { }
   }
 
   public void testStrictSingleQuotedStrings() throws IOException {
@@ -757,9 +760,8 @@ public final class JsonReaderTest extends TestCase {
   public void testLenientPartialNonExecutePrefix() throws IOException {
     JsonReader reader = new JsonReader(new StringReader(")]}' []"));
     reader.setLenient(true);
-    assertEquals(")", reader.nextString()); // lenient is almost too lenient!
     try {
-      reader.peek();
+      reader.beginArray();
       fail();
     } catch (IOException expected) {
     }