JsonLexerTest.java

// Copyright 2013 Michel Kraemer
//
// 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 de.undercouch.citeproc.helper.json;

import static org.junit.Assert.assertEquals;

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

import org.junit.Test;

import de.undercouch.citeproc.helper.json.JsonLexer.Type;

/**
 * Tests the {@link JsonLexer}
 * @author Michel Kraemer
 */
public class JsonLexerTest {
	/**
	 * Tests if a simple object consisting of several name-value pairs
	 * can be read
	 * @throws IOException if the test failed
	 */
	@Test
	public void simpleObject() throws IOException {
		String obj = "{\"name\":\"value\",\"int\":1302,\"float\":1.57,"
				+ "\"negint\":-5,\"negfloat\":-1.57,\"floatexp\":-1.5e7}";
		JsonLexer p = new JsonLexer(new StringReader(obj));
		
		Type t = p.readNextToken();
		assertEquals(Type.START_OBJECT, t);

		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String name = p.readString();
		assertEquals("name", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String value = p.readString();
		assertEquals("value", value);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		name = p.readString();
		assertEquals("int", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		int i = p.readNumber().intValue();
		assertEquals(1302, i);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		name = p.readString();
		assertEquals("float", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		float f = p.readNumber().floatValue();
		assertEquals(1.57f, f, 0.0);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		name = p.readString();
		assertEquals("negint", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		i = p.readNumber().intValue();
		assertEquals(-5, i);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		name = p.readString();
		assertEquals("negfloat", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		f = p.readNumber().floatValue();
		assertEquals(-1.57f, f, 0.0);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		name = p.readString();
		assertEquals("floatexp", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		f = p.readNumber().floatValue();
		assertEquals(-1.5e7, f, 0.0);
		
		t = p.readNextToken();
		assertEquals(Type.END_OBJECT, t);
	}
	
	/**
	 * Tests if a unicode string can be read
	 * @throws IOException if the test failed
	 */
	@Test
	public void unicode() throws IOException {
		String obj = "{\"name\":\"Michel Kr\\u00E4mer\"}";
		JsonLexer p = new JsonLexer(new StringReader(obj));
		
		Type t = p.readNextToken();
		assertEquals(Type.START_OBJECT, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String name = p.readString();
		assertEquals("name", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String value = p.readString();
		assertEquals("Michel Kr\u00E4mer", value);
		
		t = p.readNextToken();
		assertEquals(Type.END_OBJECT, t);
	}
	
	/**
	 * Tests if embedded objects and embedded arrays can be read
	 * @throws IOException if the test failed
	 */
	@Test
	public void embedded() throws IOException {
		String obj = "{\"authors\":[\"Ted\", \"Mark\"],\"date\": {\"year\":2013,\"month\":9}}";
		JsonLexer p = new JsonLexer(new StringReader(obj));
		
		Type t = p.readNextToken();
		assertEquals(Type.START_OBJECT, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String name = p.readString();
		assertEquals("authors", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.START_ARRAY, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String value = p.readString();
		assertEquals("Ted", value);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		value = p.readString();
		assertEquals("Mark", value);
		
		t = p.readNextToken();
		assertEquals(Type.END_ARRAY, t);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		value = p.readString();
		assertEquals("date", value);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.START_OBJECT, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		value = p.readString();
		assertEquals("year", value);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		int i = p.readNumber().intValue();
		assertEquals(2013, i);
		
		t = p.readNextToken();
		assertEquals(Type.COMMA, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		value = p.readString();
		assertEquals("month", value);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.NUMBER, t);
		i = p.readNumber().intValue();
		assertEquals(9, i);
		
		t = p.readNextToken();
		assertEquals(Type.END_OBJECT, t);
		
		t = p.readNextToken();
		assertEquals(Type.END_OBJECT, t);
	}
	
	/**
	 * Tests if a string with a slash can be read
	 * @throws IOException if the test failed
	 */
	@Test
	public void slash() throws IOException {
		String obj = "{\"name\":\"Michel\\/Kraemer\"}";
		JsonLexer p = new JsonLexer(new StringReader(obj));
		
		Type t = p.readNextToken();
		assertEquals(Type.START_OBJECT, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String name = p.readString();
		assertEquals("name", name);
		
		t = p.readNextToken();
		assertEquals(Type.COLON, t);
		
		t = p.readNextToken();
		assertEquals(Type.STRING, t);
		String value = p.readString();
		assertEquals("Michel/Kraemer", value);
		
		t = p.readNextToken();
		assertEquals(Type.END_OBJECT, t);
	}
}