core/tests/coretests/src/android/util/JsonReaderTest.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.util;

import junit.framework.TestCase;

import java.io.IOException;
import java.io.StringReader;

public final class JsonReaderTest extends TestCase {

    public void testReadArray() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[true, true]"));
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        assertEquals(true, reader.nextBoolean());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testReadEmptyArray() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[]"));
        reader.beginArray();
        assertFalse(reader.hasNext());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testReadObject() throws IOException {
        JsonReader reader = new JsonReader(new StringReader(
                "{\"a\": \"android\", \"b\": \"banana\"}"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        assertEquals("android", reader.nextString());
        assertEquals("b", reader.nextName());
        assertEquals("banana", reader.nextString());
        reader.endObject();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testReadEmptyObject() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{}"));
        reader.beginObject();
        assertFalse(reader.hasNext());
        reader.endObject();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testSkipObject() throws IOException {
        JsonReader reader = new JsonReader(new StringReader(
                "{\"a\": { \"c\": [], \"d\": [true, true, {}] }, \"b\": \"banana\"}"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        reader.skipValue();
        assertEquals("b", reader.nextName());
        reader.skipValue();
        reader.endObject();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testHelloWorld() throws IOException {
        String json = "{\n" +
                "   \"hello\": true,\n" +
                "   \"foo\": [\"world\"]\n" +
                "}";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginObject();
        assertEquals("hello", reader.nextName());
        assertEquals(true, reader.nextBoolean());
        assertEquals("foo", reader.nextName());
        reader.beginArray();
        assertEquals("world", reader.nextString());
        reader.endArray();
        reader.endObject();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testNulls() {
        try {
            new JsonReader(null);
            fail();
        } catch (NullPointerException expected) {
        }
    }

    public void testEmptyString() throws IOException {
        try {
            new JsonReader(new StringReader("")).beginArray();
        } catch (IOException expected) {
        }
        try {
            new JsonReader(new StringReader("")).beginObject();
        } catch (IOException expected) {
        }
    }

    public void testNoTopLevelObject() throws IOException {
        try {
            new JsonReader(new StringReader("true")).nextBoolean();
        } catch (IOException expected) {
        }
    }

    public void testCharacterUnescaping() throws IOException {
        String json = "[\"a\","
                + "\"a\\\"\","
                + "\"\\\"\","
                + "\":\","
                + "\",\","
                + "\"\\b\","
                + "\"\\f\","
                + "\"\\n\","
                + "\"\\r\","
                + "\"\\t\","
                + "\" \","
                + "\"\\\\\","
                + "\"{\","
                + "\"}\","
                + "\"[\","
                + "\"]\","
                + "\"\\u0000\","
                + "\"\\u0019\","
                + "\"\\u20AC\""
                + "]";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginArray();
        assertEquals("a", reader.nextString());
        assertEquals("a\"", reader.nextString());
        assertEquals("\"", reader.nextString());
        assertEquals(":", reader.nextString());
        assertEquals(",", reader.nextString());
        assertEquals("\b", reader.nextString());
        assertEquals("\f", reader.nextString());
        assertEquals("\n", reader.nextString());
        assertEquals("\r", reader.nextString());
        assertEquals("\t", reader.nextString());
        assertEquals(" ", reader.nextString());
        assertEquals("\\", reader.nextString());
        assertEquals("{", reader.nextString());
        assertEquals("}", reader.nextString());
        assertEquals("[", reader.nextString());
        assertEquals("]", reader.nextString());
        assertEquals("\0", reader.nextString());
        assertEquals("\u0019", reader.nextString());
        assertEquals("\u20AC", reader.nextString());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testIntegersWithFractionalPartSpecified() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[1.0,1.0,1.0]"));
        reader.beginArray();
        assertEquals(1.0, reader.nextDouble());
        assertEquals(1, reader.nextInt());
        assertEquals(1L, reader.nextLong());
    }

    public void testDoubles() throws IOException {
        String json = "[-0.0,"
                + "1.0,"
                + "1.7976931348623157E308,"
                + "4.9E-324,"
                + "0.0,"
                + "-0.5,"
                + "2.2250738585072014E-308,"
                + "3.141592653589793,"
                + "2.718281828459045]";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginArray();
        assertEquals(-0.0, reader.nextDouble());
        assertEquals(1.0, reader.nextDouble());
        assertEquals(1.7976931348623157E308, reader.nextDouble());
        assertEquals(4.9E-324, reader.nextDouble());
        assertEquals(0.0, reader.nextDouble());
        assertEquals(-0.5, reader.nextDouble());
        assertEquals(2.2250738585072014E-308, reader.nextDouble());
        assertEquals(3.141592653589793, reader.nextDouble());
        assertEquals(2.718281828459045, reader.nextDouble());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testNonFiniteDoubles() throws IOException {
        String json = "[NaN]";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginArray();
        try {
            reader.nextDouble();
            fail();
        } catch (NumberFormatException expected) {
        }
    }

    public void testLongs() throws IOException {
        String json = "[0,0,0,"
                + "1,1,1,"
                + "-1,-1,-1,"
                + "-9223372036854775808,"
                + "9223372036854775807]";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginArray();
        assertEquals(0L, reader.nextLong());
        assertEquals(0, reader.nextInt());
        assertEquals(0.0, reader.nextDouble());
        assertEquals(1L, reader.nextLong());
        assertEquals(1, reader.nextInt());
        assertEquals(1.0, reader.nextDouble());
        assertEquals(-1L, reader.nextLong());
        assertEquals(-1, reader.nextInt());
        assertEquals(-1.0, reader.nextDouble());
        try {
            reader.nextInt();
            fail();
        } catch (NumberFormatException expected) {
        }
        assertEquals(Long.MIN_VALUE, reader.nextLong());
        try {
            reader.nextInt();
            fail();
        } catch (NumberFormatException expected) {
        }
        assertEquals(Long.MAX_VALUE, reader.nextLong());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    /**
     * This test fails because there's no double for 9223372036854775806, and
     * our long parsing uses Double.parseDouble() for fractional values.
     */
    public void testHighPrecisionLong() throws IOException {
        String json = "[9223372036854775806.000]";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginArray();
        assertEquals(9223372036854775806L, reader.nextLong());
        reader.endArray();
    }

    public void testNumberWithOctalPrefix() throws IOException {
        String json = "[01]";
        JsonReader reader = new JsonReader(new StringReader(json));
        reader.beginArray();
        try {
            reader.nextInt();
            fail();
        } catch (NumberFormatException expected) {
        }
        try {
            reader.nextLong();
            fail();
        } catch (NumberFormatException expected) {
        }
        try {
            reader.nextDouble();
            fail();
        } catch (NumberFormatException expected) {
        }
        assertEquals("01", reader.nextString());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testBooleans() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[true,false]"));
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        assertEquals(false, reader.nextBoolean());
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testMixedCaseLiterals() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[True,TruE,False,FALSE,NULL,nulL]"));
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        assertEquals(true, reader.nextBoolean());
        assertEquals(false, reader.nextBoolean());
        assertEquals(false, reader.nextBoolean());
        reader.nextNull();
        reader.nextNull();
        reader.endArray();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
    }

    public void testMissingValue() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\":}"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        try {
            reader.nextString();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testPrematureEndOfInput() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\":true,"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        assertEquals(true, reader.nextBoolean());
        try {
            reader.nextName();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testPrematurelyClosed() throws IOException {
        try {
            JsonReader reader = new JsonReader(new StringReader("{\"a\":[]}"));
            reader.beginObject();
            reader.close();
            reader.nextName();
            fail();
        } catch (IllegalStateException expected) {
        }

        try {
            JsonReader reader = new JsonReader(new StringReader("{\"a\":[]}"));
            reader.close();
            reader.beginObject();
            fail();
        } catch (IllegalStateException expected) {
        }

        try {
            JsonReader reader = new JsonReader(new StringReader("{\"a\":true}"));
            reader.beginObject();
            reader.nextName();
            reader.peek();
            reader.close();
            reader.nextBoolean();
            fail();
        } catch (IllegalStateException expected) {
        }
    }

    public void testNextFailuresDoNotAdvance() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\":true}"));
        reader.beginObject();
        try {
            reader.nextString();
            fail();
        } catch (IllegalStateException expected) {
        }
        assertEquals("a", reader.nextName());
        try {
            reader.nextName();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.beginArray();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.endArray();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.beginObject();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.endObject();
            fail();
        } catch (IllegalStateException expected) {
        }
        assertEquals(true, reader.nextBoolean());
        try {
            reader.nextString();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.nextName();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.beginArray();
            fail();
        } catch (IllegalStateException expected) {
        }
        try {
            reader.endArray();
            fail();
        } catch (IllegalStateException expected) {
        }
        reader.endObject();
        assertEquals(JsonToken.END_DOCUMENT, reader.peek());
        reader.close();
    }

    public void testStringNullIsNotNull() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[\"null\"]"));
        reader.beginArray();
        try {
            reader.nextNull();
            fail();
        } catch (IllegalStateException expected) {
        }
    }

    public void testNullLiteralIsNotAString() throws IOException {
       JsonReader reader = new JsonReader(new StringReader("[null]"));
        reader.beginArray();
        try {
            reader.nextString();
            fail();
        } catch (IllegalStateException expected) {
        }
    }

    public void testStrictNameValueSeparator() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\"=true}"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        try {
            reader.nextBoolean();
            fail();
        } catch (IOException expected) {
        }

        reader = new JsonReader(new StringReader("{\"a\"=>true}"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        try {
            reader.nextBoolean();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientNameValueSeparator() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\"=true}"));
        reader.setLenient(true);
        reader.beginObject();
        assertEquals("a", reader.nextName());
        assertEquals(true, reader.nextBoolean());

        reader = new JsonReader(new StringReader("{\"a\"=>true}"));
        reader.setLenient(true);
        reader.beginObject();
        assertEquals("a", reader.nextName());
        assertEquals(true, reader.nextBoolean());
    }

    public void testStrictComments() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[// comment \n true]"));
        reader.beginArray();
        try {
            reader.nextBoolean();
            fail();
        } catch (IOException expected) {
        }

        reader = new JsonReader(new StringReader("[# comment \n true]"));
        reader.beginArray();
        try {
            reader.nextBoolean();
            fail();
        } catch (IOException expected) {
        }

        reader = new JsonReader(new StringReader("[/* comment */ true]"));
        reader.beginArray();
        try {
            reader.nextBoolean();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientComments() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[// comment \n true]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());

        reader = new JsonReader(new StringReader("[# comment \n true]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());

        reader = new JsonReader(new StringReader("[/* comment */ true]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
    }

    public void testStrictUnquotedNames() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{a:true}"));
        reader.beginObject();
        try {
            reader.nextName();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientUnquotedNames() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{a:true}"));
        reader.setLenient(true);
        reader.beginObject();
        assertEquals("a", reader.nextName());
    }

    public void testStrictSingleQuotedNames() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{'a':true}"));
        reader.beginObject();
        try {
            reader.nextName();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientSingleQuotedNames() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{'a':true}"));
        reader.setLenient(true);
        reader.beginObject();
        assertEquals("a", reader.nextName());
    }

    public void testStrictUnquotedStrings() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[a]"));
        reader.beginArray();
        try {
            reader.nextString();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientUnquotedStrings() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[a]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals("a", reader.nextString());
    }

    public void testStrictSingleQuotedStrings() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("['a']"));
        reader.beginArray();
        try {
            reader.nextString();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientSingleQuotedStrings() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("['a']"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals("a", reader.nextString());
    }

    public void testStrictSemicolonDelimitedArray() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[true;true]"));
        reader.beginArray();
        try {
            reader.nextBoolean();
            reader.nextBoolean();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientSemicolonDelimitedArray() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[true;true]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        assertEquals(true, reader.nextBoolean());
    }

    public void testStrictSemicolonDelimitedNameValuePair() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\":true;\"b\":true}"));
        reader.beginObject();
        assertEquals("a", reader.nextName());
        try {
            reader.nextBoolean();
            reader.nextName();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientSemicolonDelimitedNameValuePair() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("{\"a\":true;\"b\":true}"));
        reader.setLenient(true);
        reader.beginObject();
        assertEquals("a", reader.nextName());
        assertEquals(true, reader.nextBoolean());
        assertEquals("b", reader.nextName());
    }

    public void testStrictUnnecessaryArraySeparators() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[true,,true]"));
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        try {
            reader.nextNull();
            fail();
        } catch (IOException expected) {
        }

        reader = new JsonReader(new StringReader("[,true]"));
        reader.beginArray();
        try {
            reader.nextNull();
            fail();
        } catch (IOException expected) {
        }

        reader = new JsonReader(new StringReader("[true,]"));
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        try {
            reader.nextNull();
            fail();
        } catch (IOException expected) {
        }

        reader = new JsonReader(new StringReader("[,]"));
        reader.beginArray();
        try {
            reader.nextNull();
            fail();
        } catch (IOException expected) {
        }
    }

    public void testLenientUnnecessaryArraySeparators() throws IOException {
        JsonReader reader = new JsonReader(new StringReader("[true,,true]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        reader.nextNull();
        assertEquals(true, reader.nextBoolean());
        reader.endArray();

        reader = new JsonReader(new StringReader("[,true]"));
        reader.setLenient(true);
        reader.beginArray();
        reader.nextNull();
        assertEquals(true, reader.nextBoolean());
        reader.endArray();

        reader = new JsonReader(new StringReader("[true,]"));
        reader.setLenient(true);
        reader.beginArray();
        assertEquals(true, reader.nextBoolean());
        reader.nextNull();
        reader.endArray();

        reader = new JsonReader(new StringReader("[,]"));
        reader.setLenient(true);
        reader.beginArray();
        reader.nextNull();
        reader.nextNull();
        reader.endArray();
    }
}