/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 groovy.json.internal;
import groovy.json.JsonException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
/**
* Converts an input JSON String into Java objects works with String or char array
* as input. Produces an Object which can be any of the basic JSON types mapped
* to Java.
* <p/>
*
* @author Rick Hightower
*/
public class JsonParserUsingCharacterSource extends BaseJsonParser {
private CharacterSource characterSource;
protected String exceptionDetails(String message) {
return characterSource.errorDetails(message);
}
protected final Object decodeJsonObject() {
LazyMap map = new LazyMap();
try {
CharacterSource characterSource = this.characterSource;
if (characterSource.currentChar() == '{') {
characterSource.nextChar();
}
while (characterSource.hasChar()) {
characterSource.skipWhiteSpace();
if (characterSource.currentChar() == DOUBLE_QUOTE) {
String key = decodeString();
//puts ("key", key);
if (internKeys) {
String keyPrime = internedKeysCache.get(key);
if (keyPrime == null) {
key = key.intern();
internedKeysCache.put(key, key);
} else {
key = keyPrime;
}
}
characterSource.skipWhiteSpace();
if (characterSource.currentChar() != COLON) {
complain("expecting current character to be : but was " + charDescription(characterSource.currentChar()) + "\n");
}
characterSource.nextChar();
characterSource.skipWhiteSpace();
Object value = decodeValue();
//puts ("key", key, "value", value);
characterSource.skipWhiteSpace();
map.put(key, value);
}
int ch = characterSource.currentChar();
if (ch == '}') {
characterSource.nextChar();
break;
} else if (ch == ',') {
characterSource.nextChar();
continue;
} else {
complain(
"expecting '}' or ',' but got current char " + charDescription(ch));
}
}
} catch (Exception ex) {
throw new JsonException(exceptionDetails("Unable to parse JSON object"), ex);
}
return map;
}
protected final void complain(String complaint) {
throw new JsonException(exceptionDetails(complaint));
}
private Object decodeValue() {
CharacterSource characterSource = this.characterSource;
Object value = null;
characterSource.skipWhiteSpace();
switch (characterSource.currentChar()) {
case '"':
value = decodeString();
break;
case 't':
value = decodeTrue();
break;
case 'f':
value = decodeFalse();
break;
case 'n':
value = decodeNull();
break;
case '[':
value = decodeJsonArray();
break;
case '{':
value = decodeJsonObject();
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
value = decodeNumber(false);
break;
case '-':
value = decodeNumber(true);
break;
default:
throw new JsonException(exceptionDetails("Unable to determine the " +
"current character, it is not a string, number, array, or object"));
}
return value;
}
private Object decodeNumber(boolean negative) {
char[] chars = characterSource.readNumber();
Object value = null;
if (CharScanner.hasDecimalChar(chars, negative)) {
value = CharScanner.parseBigDecimal(chars);
} else if (CharScanner.isInteger(chars)) {
value = CharScanner.parseInt(chars);
} else if (CharScanner.isLong(chars)) {
value = CharScanner.parseLong(chars);
}
return value;
}
protected static final char[] NULL = Chr.chars("null");
protected final Object decodeNull() {
if (!characterSource.consumeIfMatch(NULL)) {
throw new JsonException(exceptionDetails("null not parse properly"));
}
return null;
}
protected static final char[] TRUE = Chr.chars("true");
protected final boolean decodeTrue() {
if (characterSource.consumeIfMatch(TRUE)) {
return true;
} else {
throw new JsonException(exceptionDetails("true not parsed properly"));
}
}
protected static char[] FALSE = Chr.chars("false");
protected final boolean decodeFalse() {
if (characterSource.consumeIfMatch(FALSE)) {
return false;
} else {
throw new JsonException(exceptionDetails("false not parsed properly"));
}
}
private CharBuf builder = CharBuf.create(20);
private String decodeString() {
CharacterSource characterSource = this.characterSource;
characterSource.nextChar();
char[] chars = characterSource.findNextChar('"', '\\');
String value = null;
if (characterSource.hadEscape()) {
value = builder.decodeJsonString(chars).toString();
builder.recycle();
} else {
value = new String(chars);
}
return value;
}
protected final List decodeJsonArray() {
ArrayList<Object> list = null;
boolean foundEnd = false;
try {
CharacterSource characterSource = this.characterSource;
if (this.characterSource.currentChar() == '[') {
characterSource.nextChar();
}
characterSource.skipWhiteSpace();
/* the list might be empty */
if (this.characterSource.currentChar() == ']') {
characterSource.nextChar();
return new ArrayList();
}
list = new ArrayList();
do {
characterSource.skipWhiteSpace();
Object arrayItem = decodeValue();
list.add(arrayItem);
characterSource.skipWhiteSpace();
int c = characterSource.currentChar();
if (c == COMMA) {
characterSource.nextChar();
continue;
} else if (c == CLOSED_BRACKET) {
foundEnd = true;
characterSource.nextChar();
break;
} else {
String charString = charDescription(c);
complain(
String.format("expecting a ',' or a ']', " +
" but got \nthe current character of %s " +
" on array index of %s \n", charString, list.size())
);
}
} while (characterSource.hasChar());
} catch (Exception ex) {
throw new JsonException(exceptionDetails("Unexpected issue"), ex);
}
if (!foundEnd) {
throw new JsonException(exceptionDetails("Could not find end of JSON array"));
}
return list;
}
public Object parse(Reader reader) {
characterSource = new ReaderCharacterSource(reader);
return this.decodeValue();
}
public Object parse(char[] chars) {
return parse(new StringReader(new String(chars)));
}
}