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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 groovy.json.JsonException;
import groovy.json.JsonParser;
import org.codehaus.groovy.runtime.DefaultGroovyMethodsSupport;
import org.codehaus.groovy.runtime.ResourceGroovyMethods;
import java.io.*;
import java.nio.charset.Charset;
import java.util.concurrent.ConcurrentHashMap;
/**
* Base JSON parser.
* Scaled down version of Boon JsonParser with features
* removed that are JDK 1.7 dependent or Groovy duplicated functionality.
*
* @author Rick Hightower
*/
public abstract class BaseJsonParser implements JsonParser {
protected static final int COLON = ':';
protected static final int COMMA = ',';
protected static final int CLOSED_CURLY = '}';
protected static final int CLOSED_BRACKET = ']';
protected static final int LETTER_E = 'e';
protected static final int LETTER_BIG_E = 'E';
protected static final int MINUS = '-';
protected static final int PLUS = '+';
protected static final int DECIMAL_POINT = '.';
protected static final int ALPHA_0 = '0';
protected static final int ALPHA_1 = '1';
protected static final int ALPHA_2 = '2';
protected static final int ALPHA_3 = '3';
protected static final int ALPHA_4 = '4';
protected static final int ALPHA_5 = '5';
protected static final int ALPHA_6 = '6';
protected static final int ALPHA_7 = '7';
protected static final int ALPHA_8 = '8';
protected static final int ALPHA_9 = '9';
protected static final int DOUBLE_QUOTE = '"';
protected static final int ESCAPE = '\\';
protected static final boolean internKeys = Boolean.parseBoolean(System.getProperty("groovy.json.internKeys", "false"));
protected static ConcurrentHashMap internedKeysCache;
private static final Charset UTF_8 = Charset.forName("UTF-8");
protected String charset = UTF_8.name();
private CharBuf fileInputBuf;
protected int bufSize = 256;
static {
if (internKeys) {
internedKeysCache = new ConcurrentHashMap();
}
}
protected String charDescription(int c) {
String charString;
if (c == ' ') {
charString = "[SPACE]";
} else if (c == '\t') {
charString = "[TAB]";
} else if (c == '\n') {
charString = "[NEWLINE]";
} else {
charString = "'" + (char) c + "'";
}
charString = charString + " with an int value of " + ((int) c);
return charString;
}
public void setCharset(String charset) {
this.charset = charset;
}
public Object parse(String jsonString) {
return parse(FastStringUtils.toCharArray(jsonString));
}
public Object parse(byte[] bytes) {
return parse(bytes, charset);
}
public Object parse(byte[] bytes, String charset) {
try {
return parse(new String(bytes, charset));
} catch (UnsupportedEncodingException e) {
return Exceptions.handle(Object.class, e);
}
}
public Object parse(CharSequence charSequence) {
return parse(FastStringUtils.toCharArray(charSequence));
}
public Object parse(Reader reader) {
fileInputBuf = IO.read(reader, fileInputBuf, bufSize);
return parse(fileInputBuf.readForRecycle());
}
public Object parse(InputStream input) {
return parse(input, charset);
}
public Object parse(InputStream input, String charset) {
try {
return parse(new InputStreamReader(input, charset));
} catch (UnsupportedEncodingException e) {
return Exceptions.handle(Object.class, e);
}
}
public Object parse(File file, String charset) {
Reader reader = null;
try {
if (charset == null || charset.length() == 0) {
reader = ResourceGroovyMethods.newReader(file);
} else {
reader = ResourceGroovyMethods.newReader(file, charset);
}
return parse(reader);
} catch (IOException ioe) {
throw new JsonException("Unable to process file: " + file.getPath(), ioe);
} finally {
if (reader != null) {
DefaultGroovyMethodsSupport.closeWithWarning(reader);
}
}
}
protected static boolean isDecimalChar(int currentChar) {
switch (currentChar) {
case MINUS:
case PLUS:
case LETTER_E:
case LETTER_BIG_E:
case DECIMAL_POINT:
return true;
}
return false;
}
protected static boolean isDelimiter(int c) {
return c == COMMA || c == CLOSED_CURLY || c == CLOSED_BRACKET;
}
protected static final boolean isNumberDigit(int c) {
return c >= ALPHA_0 && c <= ALPHA_9;
}
protected static final boolean isDoubleQuote(int c) {
return c == DOUBLE_QUOTE;
}
protected static final boolean isEscape(int c) {
return c == ESCAPE;
}
protected static boolean hasEscapeChar(char[] array, int index, int[] indexHolder) {
char currentChar;
for (; index < array.length; index++) {
currentChar = array[index];
if (isDoubleQuote(currentChar)) {
indexHolder[0] = index;
return false;
} else if (isEscape(currentChar)) {
indexHolder[0] = index;
return true;
}
}
indexHolder[0] = index;
return false;
}
int[] indexHolder = new int[1];
protected static int findEndQuote(final char[] array, int index) {
char currentChar;
boolean escape = false;
for (; index < array.length; index++) {
currentChar = array[index];
if (isDoubleQuote(currentChar)) {
if (!escape) {
break;
}
}
escape = isEscape(currentChar) && !escape;
}
return index;
}
}