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Groovy: A powerful, dynamic language for the JVM
/*
* 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 java.util.ArrayList;
import java.util.List;
/**
* This works in index overlay mode or chop mode.
* Chop mode reduces possibility of memory leak but causes a few more buffer copies as it chops up the buffer.
*
* @author Rick Hightower
*/
public class JsonFastParser extends JsonParserCharArray {
private final boolean useValues;
private final boolean chop;
private final boolean lazyChop;
private final boolean checkDates;
public JsonFastParser() {
this(true);
}
public JsonFastParser(boolean useValues) {
this(useValues, false);
}
public JsonFastParser(boolean useValues, boolean chop) {
this(useValues, chop, !chop);
}
public JsonFastParser(boolean useValues, boolean chop, boolean lazyChop) {
this(useValues, chop, lazyChop, true);
}
public JsonFastParser(boolean useValues, boolean chop, boolean lazyChop, boolean checkDates) {
this.useValues = useValues;
this.chop = chop;
this.lazyChop = lazyChop;
this.checkDates = checkDates;
}
protected final Value decodeJsonObjectLazyFinalParse() {
char[] array = charArray;
if (__currentChar == '{')
__index++;
ValueMap map = useValues ? new ValueMapImpl() : new LazyValueMap(lazyChop);
Value value = new ValueContainer(map);
objectLoop:
for (; __index < array.length; __index++) {
skipWhiteSpace();
switch (__currentChar) {
case '"':
Value key = decodeStringOverlay();
skipWhiteSpace();
if (__currentChar != ':') {
complain("expecting current character to be " + charDescription(__currentChar) + "\n");
}
__index++;
Value item = decodeValueOverlay();
skipWhiteSpace();
MapItemValue miv = new MapItemValue(key, item);
map.add(miv);
}
switch (__currentChar) {
case '}':
__index++;
break objectLoop;
case ',':
continue;
default:
complain(
"expecting '}' or ',' but got current char " + charDescription(__currentChar));
}
}
return value;
}
protected Value decodeValue() {
return decodeValueOverlay();
}
private Value decodeValueOverlay() {
skipWhiteSpace();
switch (__currentChar) {
case '"':
return decodeStringOverlay();
case '{':
return decodeJsonObjectLazyFinalParse();
case 't':
return decodeTrue() ? ValueContainer.TRUE : ValueContainer.FALSE;
case 'f':
return !decodeFalse() ? ValueContainer.FALSE : ValueContainer.TRUE;
case 'n':
return decodeNull() == null ? ValueContainer.NULL : ValueContainer.NULL;
case '[':
return decodeJsonArrayOverlay();
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '0':
return decodeNumberOverlay(false);
case '-':
return decodeNumberOverlay(true);
default:
complain("Unable to determine the " +
"current character, it is not a string, number, array, or object");
return null;
}
}
private Value decodeNumberOverlay(final boolean minus) {
char[] array = charArray;
final int startIndex = __index;
int index = __index;
char currentChar;
boolean doubleFloat = false;
boolean foundDot = false;
boolean foundSign = false;
boolean foundExp = false;
if (minus && index + 1 < array.length) {
index++;
}
while (true) {
currentChar = array[index];
if (isNumberDigit(currentChar)) {
//noop
} else if (currentChar <= 32) { //white
break;
} else if (isDelimiter(currentChar)) {
break;
} else if (isDecimalChar(currentChar)) {
switch (currentChar) {
case DECIMAL_POINT:
if (foundDot || foundExp) { complain("unexpected character " + currentChar); }
foundDot = true;
break;
case LETTER_E:
case LETTER_BIG_E:
if (foundExp) { complain("unexpected character " + currentChar); }
foundExp = true;
break;
case MINUS:
case PLUS:
if (foundSign || !foundExp) { complain("unexpected character " + currentChar); }
if (foundExp && array[index - 1] != LETTER_E && array[index - 1] != LETTER_BIG_E) {
complain("unexpected character " + currentChar);
}
foundSign = true;
break;
}
doubleFloat = true;
} else {
complain("unexpected character " + currentChar);
}
index++;
if (index >= array.length) break;
}
// Handle the case where the exponential number ends without the actual exponent
if (foundExp) {
char prevChar = array[index - 1];
if (prevChar == LETTER_E || prevChar == LETTER_BIG_E || prevChar == MINUS || prevChar == PLUS) {
complain("unexpected character " + currentChar);
}
}
__index = index;
__currentChar = currentChar;
Type type = doubleFloat ? Type.DOUBLE : Type.INTEGER;
return new NumberValue(chop, type, startIndex, __index, this.charArray);
}
private Value decodeStringOverlay() {
char[] array = charArray;
int index = __index;
char currentChar = charArray[index];
if (index < array.length && currentChar == '"') {
index++;
}
final int startIndex = index;
boolean encoded = hasEscapeChar(array, index, indexHolder);
index = indexHolder[0];
if (encoded) {
index = findEndQuote(array, index);
}
Value value = new CharSequenceValue(chop, Type.STRING, startIndex, index, array, encoded, checkDates);
if (index < array.length) {
index++;
}
__index = index;
return value;
}
private Value decodeJsonArrayOverlay() {
char[] array = charArray;
if (__currentChar == '[') {
__index++;
}
skipWhiteSpace();
/* the list might be empty */
if (__currentChar == ']') {
__index++;
return new ValueContainer(new ArrayList());
}
List