package com.intellectualcrafters.json;
import java.util.Iterator;
/**
* This provides static methods to convert an XML text into a JSONObject, and to covert a JSONObject into an XML text.
*
* @author JSON.org
* @version 2014-05-03
*/
class XML {
static final Character AMP = '&';
static final Character APOS = '\'';
static final Character BANG = '!';
static final Character EQ = '=';
static final Character GT = '>';
static final Character LT = '<';
static final Character QUEST = '?';
static final Character QUOT = '"';
static final Character SLASH = '/';
static String escape(String string) {
StringBuilder sb = new StringBuilder(string.length());
for (int i = 0, length = string.length(); i < length; i++) {
char c = string.charAt(i);
switch (c) {
case '&':
sb.append("&");
break;
case '<':
sb.append("<");
break;
case '>':
sb.append(">");
break;
case '"':
sb.append(""");
break;
case '\'':
sb.append("'");
break;
default:
sb.append(c);
}
}
return sb.toString();
}
/**
* Throw an exception if the string contains whitespace. Whitespace is not allowed in tagNames and attributes.
*
* @param string A string.
*
* @throws JSONException
*/
static void noSpace(String string) throws JSONException {
int length = string.length();
if (length == 0) {
throw new JSONException("Empty string.");
}
for (char c : string.toCharArray()) {
if (Character.isWhitespace(c)) {
throw new JSONException('\'' + string + "' contains a space character.");
}
}
}
/**
* Scan the content following the named tag, attaching it to the context.
*
* @param x The XMLTokener containing the source string.
* @param context The JSONObject that will include the new material.
* @param name The tag name.
*
* @return true if the close tag is processed.
*
* @throws JSONException
*/
private static boolean parse(XMLTokener x, JSONObject context, String name) throws JSONException {
// Test for and skip past these forms:
// <!-- ... -->
// <! ... >
// <![ ... ]]>
// <? ... ?>
// Report errors for these forms:
// <>
// <=
// <<
Object token = x.nextToken();
// <!
String string;
if (token == BANG) {
char c = x.next();
if (c == '-') {
if (x.next() == '-') {
x.skipPast("-->");
return false;
}
x.back();
} else if (c == '[') {
token = x.nextToken();
if ("CDATA".equals(token)) {
if (x.next() == '[') {
string = x.nextCDATA();
if (!string.isEmpty()) {
context.accumulate("content", string);
}
return false;
}
}
throw x.syntaxError("Expected 'CDATA['");
}
int i = 1;
do {
token = x.nextMeta();
if (token == null) {
throw x.syntaxError("Missing '>' after '<!'.");
} else if (token == LT) {
i += 1;
} else if (token == GT) {
i -= 1;
}
} while (i > 0);
return false;
} else if (token == QUEST) {
// <?
x.skipPast("?>");
return false;
} else if (token == SLASH) {
// Close tag </
token = x.nextToken();
if (name == null) {
throw x.syntaxError("Mismatched close tag " + token);
}
if (!token.equals(name)) {
throw x.syntaxError("Mismatched " + name + " and " + token);
}
if (x.nextToken() != GT) {
throw x.syntaxError("Misshaped close tag");
}
return true;
} else if (token instanceof Character) {
throw x.syntaxError("Misshaped tag");
// Open tag <
} else {
String tagName = (String) token;
token = null;
JSONObject jsonobject = new JSONObject();
for (;;) {
if (token == null) {
token = x.nextToken();
}
// attribute = value
if (token instanceof String) {
string = (String) token;
token = x.nextToken();
if (token == EQ) {
token = x.nextToken();
if (!(token instanceof String)) {
throw x.syntaxError("Missing value");
}
jsonobject.accumulate(string, XML.stringToValue((String) token));
token = null;
} else {
jsonobject.accumulate(string, "");
}
// Empty tag <.../>
} else if (token == SLASH) {
if (x.nextToken() != GT) {
throw x.syntaxError("Misshaped tag");
}
if (jsonobject.length() > 0) {
context.accumulate(tagName, jsonobject);
} else {
context.accumulate(tagName, "");
}
return false;
// Content, between <...> and </...>
} else if (token == GT) {
for (;;) {
token = x.nextContent();
if (token == null) {
if (tagName != null) {
throw x.syntaxError("Unclosed tag " + tagName);
}
return false;
} else if (token instanceof String) {
string = (String) token;
if (!string.isEmpty()) {
jsonobject.accumulate("content", XML.stringToValue(string));
}
// Nested element
} else if (token == LT) {
if (parse(x, jsonobject, tagName)) {
if (jsonobject.length() == 0) {
context.accumulate(tagName, "");
} else if ((jsonobject.length() == 1) && (jsonobject.opt("content") != null)) {
context.accumulate(tagName, jsonobject.opt("content"));
} else {
context.accumulate(tagName, jsonobject);
}
return false;
}
}
}
} else {
throw x.syntaxError("Misshaped tag");
}
}
}
}
/**
* Try to convert a string into a number, boolean, or null. If the string can't be converted, return the string.
* This is much less ambitious than JSONObject.stringToValue, especially because it does not attempt to convert plus
* forms, octal forms, hex forms, or E forms lacking decimal points.
*
* @param string A String.
*
* @return A simple JSON value.
*/
static Object stringToValue(String string) {
if ("true".equalsIgnoreCase(string)) {
return Boolean.TRUE;
}
if ("false".equalsIgnoreCase(string)) {
return Boolean.FALSE;
}
if ("null".equalsIgnoreCase(string)) {
return JSONObject.NULL;
}
//If it might be a number, try converting it, first as a Long, and then as a Double. If that doesn't work, return the string.
try {
char initial = string.charAt(0);
if ((initial == '-') || ((initial >= '0') && (initial <= '9'))) {
Long value = Long.valueOf(string);
if (value.toString().equals(string)) {
return value;
}
}
} catch (NumberFormatException ignore) {
try {
Double value = Double.valueOf(string);
if (value.toString().equals(string)) {
return value;
}
} catch (NumberFormatException ignored) {}
}
return string;
}
public static JSONObject toJSONObject(String string) throws JSONException {
JSONObject jo = new JSONObject();
XMLTokener x = new XMLTokener(string);
while (x.more() && x.skipPast("<")) {
parse(x, jo, null);
}
return jo;
}
/**
* Convert a JSONObject into a well-formed, element-normal XML string.
*
* @param object A JSONObject.
*
* @return A string.
*
* @throws JSONException
*/
public static String toString(Object object) throws JSONException {
return toString(object, null);
}
/**
* Convert a JSONObject into a well-formed, element-normal XML string.
*
* @param object A JSONObject.
* @param tagName The optional name of the enclosing tag.
*
* @return A string.
*
* @throws JSONException
*/
public static String toString(Object object, String tagName) throws JSONException {
StringBuilder sb = new StringBuilder();
int i;
JSONArray ja;
int length;
String string;
if (object instanceof JSONObject) {
// Emit <tagName>
if (tagName != null) {
sb.append('<');
sb.append(tagName);
sb.append('>');
}
// Loop thru the keys.
JSONObject jo = (JSONObject) object;
Iterator<String> keys = jo.keys();
while (keys.hasNext()) {
String key = keys.next();
Object value = jo.opt(key);
if (value == null) {
value = "";
}
string = value instanceof String ? (String) value : null;
// Emit content in body
if ("content".equals(key)) {
if (value instanceof JSONArray) {
ja = (JSONArray) value;
length = ja.length();
for (i = 0; i < length; i += 1) {
if (i > 0) {
sb.append('\n');
}
sb.append(escape(ja.get(i).toString()));
}
} else {
sb.append(escape(value.toString()));
}
// Emit an array of similar keys
} else if (value instanceof JSONArray) {
ja = (JSONArray) value;
length = ja.length();
for (i = 0; i < length; i += 1) {
value = ja.get(i);
if (value instanceof JSONArray) {
sb.append('<');
sb.append(key);
sb.append('>');
sb.append(toString(value));
sb.append("</");
sb.append(key);
sb.append('>');
} else {
sb.append(toString(value, key));
}
}
} else if ("".equals(value)) {
sb.append('<');
sb.append(key);
sb.append("/>");
// Emit a new tag <k>
} else {
sb.append(toString(value, key));
}
}
if (tagName != null) {
// Emit the </tagname> close tag
sb.append("</");
sb.append(tagName);
sb.append('>');
}
return sb.toString();
// XML does not have good support for arrays. If an array appears in
// a place
// where XML is lacking, synthesize an <array> element.
} else {
if (object.getClass().isArray()) {
object = new JSONArray(object);
}
if (object instanceof JSONArray) {
ja = (JSONArray) object;
length = ja.length();
for (i = 0; i < length; i += 1) {
sb.append(toString(ja.opt(i), tagName == null ? "array" : tagName));
}
return sb.toString();
} else {
string = escape(object.toString());
return (tagName == null) ? '"' + string + '"' :
string.isEmpty() ? '<' + tagName + "/>" : '<' + tagName + '>' + string + "</" + tagName + '>';
}
}
}
}