/*
* 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.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 JsonParserCharArray extends BaseJsonParser {
protected char[] charArray;
protected int __index;
protected char __currentChar;
private int lastIndex;
protected Object decodeFromChars(char[] cs) {
__index = 0;
charArray = cs;
lastIndex = cs.length - 1;
return decodeValue();
}
protected final boolean hasMore() {
return __index < lastIndex;
}
protected final boolean hasCurrent() {
return __index <= lastIndex;
}
protected final void skipWhiteSpace() {
int ix = __index;
if (hasCurrent()) {
this.__currentChar = this.charArray[ix];
}
if (__currentChar <= 32) {
ix = skipWhiteSpaceFast(this.charArray, ix);
this.__currentChar = this.charArray[ix];
__index = ix;
}
}
protected final char nextChar() {
try {
if (hasMore()) {
__index++;
return __currentChar = charArray[__index];
} else {
// TODO move unicode 0 to separate file to avoid doc parsing issues
return '\u0000';
}
} catch (Exception ex) {
throw new JsonException(exceptionDetails("unable to advance character"), ex);
}
}
protected String exceptionDetails(String message) {
return CharScanner.errorDetails(message, charArray, __index, __currentChar);
}
private static int skipWhiteSpaceFast(char[] array, int index) {
char c;
for (; index < array.length; index++) {
c = array[index];
if (c > 32) {
return index;
}
}
return index - 1;
}
protected final Object decodeJsonObject() {
if (__currentChar == '{') {
__index++;
}
LazyMap map = new LazyMap();
for (; __index < this.charArray.length; __index++) {
skipWhiteSpace();
if (__currentChar == '"') {
String key = decodeString();
if (internKeys) {
String keyPrime = internedKeysCache.get(key);
if (keyPrime == null) {
key = key.intern();
internedKeysCache.put(key, key);
} else {
key = keyPrime;
}
}
skipWhiteSpace();
if (__currentChar != ':') {
complain("expecting current character to be " + charDescription(__currentChar) + "\n");
}
__index++;
skipWhiteSpace();
Object value = decodeValueInternal();
skipWhiteSpace();
map.put(key, value);
}
if (__currentChar == '}') {
__index++;
break;
} else if (__currentChar == ',') {
continue;
} else {
complain(
"expecting '}' or ',' but got current char " + charDescription(__currentChar));
}
}
return map;
}
protected final void complain(String complaint) {
throw new JsonException(exceptionDetails(complaint));
}
protected Object decodeValue() {
return decodeValueInternal();
}
private Object decodeValueInternal() {
Object value = null;
skipWhiteSpace();
switch (__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();
break;
case '-':
value = decodeNumber();
break;
default:
throw new JsonException(exceptionDetails("Unable to determine the " +
"current character, it is not a string, number, array, or object"));
}
return value;
}
int[] endIndex = new int[1];
private Object decodeNumber() {
Number num = CharScanner.parseJsonNumber(charArray, __index, charArray.length, endIndex);
__index = endIndex[0];
return num;
}
protected static final char[] NULL = Chr.chars("null");
protected final Object decodeNull() {
if (__index + NULL.length <= charArray.length) {
if (charArray[__index] == 'n' &&
charArray[++__index] == 'u' &&
charArray[++__index] == 'l' &&
charArray[++__index] == 'l') {
__index++;
return null;
}
}
throw new JsonException(exceptionDetails("null not parse properly"));
}
protected static final char[] TRUE = Chr.chars("true");
protected final boolean decodeTrue() {
if (__index + TRUE.length <= charArray.length) {
if (charArray[__index] == 't' &&
charArray[++__index] == 'r' &&
charArray[++__index] == 'u' &&
charArray[++__index] == 'e') {
__index++;
return true;
}
}
throw new JsonException(exceptionDetails("true not parsed properly"));
}
protected static char[] FALSE = Chr.chars("false");
protected final boolean decodeFalse() {
if (__index + FALSE.length <= charArray.length) {
if (charArray[__index] == 'f' &&
charArray[++__index] == 'a' &&
charArray[++__index] == 'l' &&
charArray[++__index] == 's' &&
charArray[++__index] == 'e') {
__index++;
return false;
}
}
throw new JsonException(exceptionDetails("false not parsed properly"));
}
private CharBuf builder = CharBuf.create(20);
private String decodeString() {
char[] array = charArray;
int index = __index;
char currentChar = array[index];
if (index < array.length && currentChar == '"') {
index++;
}
final int startIndex = index;
boolean encoded = hasEscapeChar(array, index, indexHolder);
index = indexHolder[0];
String value = null;
if (encoded) {
index = findEndQuote(array, index);
value = builder.decodeJsonString(array, startIndex, index).toString();
builder.recycle();
} else {
value = new String(array, startIndex, (index - startIndex));
}
if (index < charArray.length) {
index++;
}
__index = index;
return value;
}
protected final List decodeJsonArray() {
ArrayList<Object> list = null;
boolean foundEnd = false;
char[] charArray = this.charArray;
try {
if (__currentChar == '[') {
__index++;
}
int lastIndex;
skipWhiteSpace();
/* the list might be empty */
if (__currentChar == ']') {
__index++;
return new ArrayList();
}
list = new ArrayList();
while (this.hasMore()) {
Object arrayItem = decodeValueInternal();
list.add(arrayItem);
char c = charArray[__index];
if (c == ',') {
__index++;
continue;
} else if (c == ']') {
__index++;
foundEnd = true;
break;
}
lastIndex = __index;
skipWhiteSpace();
c = charArray[__index];
if (c == ',') {
__index++;
continue;
} else if (c == ']' && lastIndex != __index) {
__index++;
foundEnd = true;
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())
);
}
}
} catch (Exception ex) {
if (ex instanceof JsonException) {
throw (JsonException) ex;
}
throw new JsonException(exceptionDetails("issue parsing JSON array"), ex);
}
if (!foundEnd) {
complain("Did not find end of Json Array");
}
return list;
}
protected final char currentChar() {
if (__index > lastIndex) {
return 0;
} else {
return charArray[__index];
}
}
public Object parse(char[] chars) {
return this.decodeFromChars(chars);
}
}