Update reader and writer to RFC 7159.

moshi/src/main/java/com/squareup/moshi/JsonReader.java

@@ -23,7 +23,7 @@ import okio.BufferedSource;
 import okio.ByteString;
 
 /**
- * Reads a JSON (<a href="http://www.ietf.org/rfc/rfc4627.txt">RFC 4627</a>)
+ * Reads a JSON (<a href="http://www.ietf.org/rfc/rfc7159.txt">RFC 7159</a>)
  * encoded value as a stream of tokens. This stream includes both literal
  * values (strings, numbers, booleans, and nulls) as well as the begin and
  * end delimiters of objects and arrays. The tokens are traversed in
@@ -272,7 +272,7 @@ public class JsonReader implements Closeable {
   /**
    * Configure this parser to be liberal in what it accepts. By default
    * this parser is strict and only accepts JSON as specified by <a
-   * href="http://www.ietf.org/rfc/rfc4627.txt">RFC 4627</a>. Setting the
+   * href="http://www.ietf.org/rfc/rfc7159.txt">RFC 7159</a>. Setting the
    * parser to lenient causes it to ignore the following syntax errors:
    *
    * <ul>
@@ -568,9 +568,6 @@ public class JsonReader implements Closeable {
         buffer.readByte(); // Consume '\''.
         return peeked = PEEKED_SINGLE_QUOTED;
       case '"':
-        if (stackSize == 1) {
-          checkLenient();
-        }
         buffer.readByte(); // Consume '\"'.
         return peeked = PEEKED_DOUBLE_QUOTED;
       case '[':
@@ -582,10 +579,6 @@ public class JsonReader implements Closeable {
       default:
     }
 
-    if (stackSize == 1) {
-      checkLenient(); // Top-level value isn't an array or an object.
-    }
-
     int result = peekKeyword();
     if (result != PEEKED_NONE) {
       return result;

moshi/src/main/java/com/squareup/moshi/JsonWriter.java

@@ -30,7 +30,7 @@ import static com.squareup.moshi.JsonScope.NONEMPTY_DOCUMENT;
 import static com.squareup.moshi.JsonScope.NONEMPTY_OBJECT;
 
 /**
- * Writes a JSON (<a href="http://www.ietf.org/rfc/rfc4627.txt">RFC 4627</a>)
+ * Writes a JSON (<a href="http://www.ietf.org/rfc/rfc7159.txt">RFC 7159</a>)
  * encoded value to a stream, one token at a time. The stream includes both
  * literal values (strings, numbers, booleans and nulls) as well as the begin
  * and end delimiters of objects and arrays.
@@ -127,7 +127,7 @@ import static com.squareup.moshi.JsonScope.NONEMPTY_OBJECT;
 public class JsonWriter implements Closeable, Flushable {
 
   /*
-   * From RFC 4627, "All Unicode characters may be placed within the
+   * From RFC 7159, "All Unicode characters may be placed within the
    * quotation marks except for the characters that must be escaped:
    * quotation mark, reverse solidus, and the control characters
    * (U+0000 through U+001F)."
@@ -217,7 +217,7 @@ public class JsonWriter implements Closeable, Flushable {
   /**
    * Configure this writer to relax its syntax rules. By default, this writer
    * only emits well-formed JSON as specified by <a
-   * href="http://www.ietf.org/rfc/rfc4627.txt">RFC 4627</a>. Setting the writer
+   * href="http://www.ietf.org/rfc/rfc7159.txt">RFC 7159</a>. Setting the writer
    * to lenient permits the following:
    * <ul>
    *   <li>Top-level values of any type. With strict writing, the top-level
@@ -299,7 +299,7 @@ public class JsonWriter implements Closeable, Flushable {
    * bracket.
    */
   private JsonWriter open(int empty, String openBracket) throws IOException {
-    beforeValue(true);
+    beforeValue();
     pathIndices[stackSize] = 0;
     push(empty);
     sink.writeUtf8(openBracket);
@@ -400,7 +400,7 @@ public class JsonWriter implements Closeable, Flushable {
       return name(value);
     }
     writeDeferredName();
-    beforeValue(false);
+    beforeValue();
     string(value);
     pathIndices[stackSize - 1]++;
     return this;
@@ -420,7 +420,7 @@ public class JsonWriter implements Closeable, Flushable {
         return this; // skip the name and the value
       }
     }
-    beforeValue(false);
+    beforeValue();
     sink.writeUtf8("null");
     pathIndices[stackSize - 1]++;
     return this;
@@ -433,7 +433,7 @@ public class JsonWriter implements Closeable, Flushable {
    */
   public JsonWriter value(boolean value) throws IOException {
     writeDeferredName();
-    beforeValue(false);
+    beforeValue();
     sink.writeUtf8(value ? "true" : "false");
     pathIndices[stackSize - 1]++;
     return this;
@@ -454,7 +454,7 @@ public class JsonWriter implements Closeable, Flushable {
       return name(Double.toString(value));
     }
     writeDeferredName();
-    beforeValue(false);
+    beforeValue();
     sink.writeUtf8(Double.toString(value));
     pathIndices[stackSize - 1]++;
     return this;
@@ -470,7 +470,7 @@ public class JsonWriter implements Closeable, Flushable {
       return name(Long.toString(value));
     }
     writeDeferredName();
-    beforeValue(false);
+    beforeValue();
     sink.writeUtf8(Long.toString(value));
     pathIndices[stackSize - 1]++;
     return this;
@@ -497,7 +497,7 @@ public class JsonWriter implements Closeable, Flushable {
       return name(string);
     }
     writeDeferredName();
-    beforeValue(false);
+    beforeValue();
     sink.writeUtf8(string);
     pathIndices[stackSize - 1]++;
     return this;
@@ -591,12 +591,9 @@ public class JsonWriter implements Closeable, Flushable {
    * Inserts any necessary separators and whitespace before a literal value,
    * inline array, or inline object. Also adjusts the stack to expect either a
    * closing bracket or another element.
-   *
-   * @param root true if the value is a new array or object, the two values
-   *     permitted as top-level elements.
    */
   @SuppressWarnings("fallthrough")
-  private void beforeValue(boolean root) throws IOException {
+  private void beforeValue() throws IOException {
     switch (peek()) {
       case NONEMPTY_DOCUMENT:
         if (!lenient) {
@@ -605,10 +602,6 @@ public class JsonWriter implements Closeable, Flushable {
         }
         // fall-through
       case EMPTY_DOCUMENT: // first in document
-        if (!lenient && !root) {
-          throw new IllegalStateException(
-              "JSON must start with an array or an object.");
-        }
         replaceTop(NONEMPTY_DOCUMENT);
         break;
 

moshi/src/test/java/com/squareup/moshi/JsonReaderTest.java

@@ -264,14 +264,6 @@ public final class JsonReaderTest {
     }
   }
 
-  @Test public void noTopLevelObject() {
-    try {
-      newReader("true").nextBoolean();
-      fail();
-    } catch (IOException expected) {
-    }
-  }
-
   @Test public void characterUnescaping() throws IOException {
     String json = "[\"a\","
         + "\"a\\\"\","
@@ -1341,44 +1333,36 @@ public final class JsonReaderTest {
     }
   }
 
-  @Test public void strictTopLevelString() {
+  @Test public void topLevelValueTypes() throws IOException {
-    JsonReader reader = newReader("\"a\"");
+    JsonReader reader1 = newReader("true");
-    try {
+    assertThat(reader1.nextBoolean()).isTrue();
-      reader.nextString();
+    assertThat(reader1.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
-      fail();
+
-    } catch (IOException expected) {
+    JsonReader reader2 = newReader("false");
-    }
+    assertThat(reader2.nextBoolean()).isFalse();
+    assertThat(reader2.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
+
+    JsonReader reader3 = newReader("null");
+    assertThat(reader3.nextNull()).isNull();
+    assertThat(reader3.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
+
+    JsonReader reader4 = newReader("123");
+    assertThat(reader4.nextInt()).isEqualTo(123);
+    assertThat(reader4.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
+
+    JsonReader reader5 = newReader("123.4");
+    assertThat(reader5.nextDouble()).isEqualTo(123.4);
+    assertThat(reader5.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
+
+    JsonReader reader6 = newReader("\"a\"");
+    assertThat(reader6.nextString()).isEqualTo("a");
+    assertThat(reader6.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
   }
 
-  @Test public void lenientTopLevelString() throws IOException {
+  @Test public void topLevelValueTypeWithSkipValue() throws IOException {
-    JsonReader reader = newReader("\"a\"");
-    reader.setLenient(true);
-    assertThat(reader.nextString()).isEqualTo("a");
-    assertThat(reader.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
-  }
-
-  @Test public void strictTopLevelValueType() {
     JsonReader reader = newReader("true");
-    try {
-      reader.nextBoolean();
-      fail();
-    } catch (IOException expected) {
-    }
-  }
-
-  @Test public void lenientTopLevelValueType() throws IOException {
-    JsonReader reader = newReader("true");
-    reader.setLenient(true);
-    assertThat(reader.nextBoolean()).isTrue();
-  }
-
-  @Test public void strictTopLevelValueTypeWithSkipValue() {
-    JsonReader reader = newReader("true");
-    try {
     reader.skipValue();
-      fail();
+    assertThat(reader.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
-    } catch (IOException expected) {
-    }
   }
 
   @Test @Ignore public void bomIgnoredAsFirstCharacterOfDocument() throws IOException {

moshi/src/test/java/com/squareup/moshi/JsonWriterTest.java

@@ -48,11 +48,41 @@ public final class JsonWriterTest {
     assertThat(buffer.readUtf8()).isEqualTo("{\"a\":null}");
   }
 
-  @Test public void wrongTopLevelType() throws IOException {
+  @Test public void topLevelValueTypes() throws IOException {
     Buffer buffer = new Buffer();
-    JsonWriter jsonWriter = JsonWriter.of(buffer);
+
+    JsonWriter writer1 = JsonWriter.of(buffer);
+    writer1.value(true);
+    writer1.close();
+    assertThat(buffer.readUtf8()).isEqualTo("true");
+
+    JsonWriter writer2 = JsonWriter.of(buffer);
+    writer2.nullValue();
+    writer2.close();
+    assertThat(buffer.readUtf8()).isEqualTo("null");
+
+    JsonWriter writer3 = JsonWriter.of(buffer);
+    writer3.value(123);
+    writer3.close();
+    assertThat(buffer.readUtf8()).isEqualTo("123");
+
+    JsonWriter writer4 = JsonWriter.of(buffer);
+    writer4.value(123.4);
+    writer4.close();
+    assertThat(buffer.readUtf8()).isEqualTo("123.4");
+
+    JsonWriter writer5 = JsonWriter.of(buffer);
+    writer5.value("a");
+    writer5.close();
+    assertThat(buffer.readUtf8()).isEqualTo("\"a\"");
+  }
+
+  @Test public void invalidTopLevelTypes() throws IOException {
+    Buffer buffer = new Buffer();
+    JsonWriter writer = JsonWriter.of(buffer);
+    writer.name("hello");
     try {
-      jsonWriter.value("a");
+      writer.value("world");
       fail();
     } catch (IllegalStateException expected) {
     }