package com.xiaoleilu.hutool.json;
import java.util.Iterator;
/**
* 提供静态方法在XML和JSONObject之间转换
*
* @author JSON.org
*/
public class XML {
/** The Character '&'. */
public static final Character AMP = '&';
/** The Character '''. */
public static final Character APOS = '\'';
/** The Character '!'. */
public static final Character BANG = '!';
/** The Character '='. */
public static final Character EQ = '=';
/** The Character '>'. */
public static final Character GT = '>';
/** The Character '<'. */
public static final Character LT = '<';
/** The Character '?'. */
public static final Character QUEST = '?';
/** The Character '"'. */
public static final Character QUOT = '"';
/** The Character '/'. */
public static final Character SLASH = '/';
/**
* Replace special characters with XML escapes:
*
* <pre>
* & <small>(ampersand)</small> is replaced by &
* < <small>(less than)</small> is replaced by <
* > <small>(greater than)</small> is replaced by >
* " <small>(double quote)</small> is replaced by "
* </pre>
*
* @param string The string to be escaped.
* @return The escaped string.
*/
public 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 Thrown if the string contains whitespace or is empty.
*/
public static void noSpace(String string) throws JSONException {
int i, length = string.length();
if (length == 0) {
throw new JSONException("Empty string.");
}
for (i = 0; i < length; i += 1) {
if (Character.isWhitespace(string.charAt(i))) {
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, boolean keepStrings) throws JSONException {
char c;
int i;
JSONObject jsonobject = null;
String string;
String tagName;
Object token;
// Test for and skip past these forms:
// <!-- ... -->
// <! ... >
// <![ ... ]]>
// <? ... ?>
// Report errors for these forms:
// <>
// <=
// <<
token = x.nextToken();
// <!
if (token == BANG) {
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.length() > 0) {
context.accumulate("content", string);
}
return false;
}
}
throw x.syntaxError("Expected 'CDATA['");
}
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 {
tagName = (String) token;
token = null;
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, keepStrings ? token : InternalJSONUtil.stringToValue((String) token));
token = null;
} else {
jsonobject.accumulate(string, "");
}
} else if (token == SLASH) {
// Empty tag <.../>
if (x.nextToken() != GT) {
throw x.syntaxError("Misshaped tag");
}
if (jsonobject.size() > 0) {
context.accumulate(tagName, jsonobject);
} else {
context.accumulate(tagName, "");
}
return false;
} else if (token == GT) {
// Content, between <...> and </...>
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.length() > 0) {
jsonobject.accumulate("content", keepStrings ? token : InternalJSONUtil.stringToValue(string));
}
} else if (token == LT) {
// Nested element
if (parse(x, jsonobject, tagName, keepStrings)) {
if (jsonobject.size() == 0) {
context.accumulate(tagName, "");
} else if (jsonobject.size() == 1 && jsonobject.get("content") != null) {
context.accumulate(tagName, jsonobject.get("content"));
} else {
context.accumulate(tagName, jsonobject);
}
return false;
}
}
}
} else {
throw x.syntaxError("Misshaped tag");
}
}
}
}
/**
* Convert a well-formed (but not necessarily valid) XML string into a JSONObject. Some information may be lost in this transformation because JSON is a data format and XML is a document format.
* XML uses elements, attributes, and content text, while JSON uses unordered collections of name/value pairs and arrays of values. JSON does not does not like to distinguish between elements and
* attributes. Sequences of similar elements are represented as JSONArrays. Content text may be placed in a "content" member. Comments, prologs, DTDs, and <code><[ [ ]]></code> are ignored.
*
* @param string The source string.
* @return A JSONObject containing the structured data from the XML string.
* @throws JSONException Thrown if there is an errors while parsing the string
*/
public static JSONObject toJSONObject(String string) throws JSONException {
return toJSONObject(string, false);
}
/**
* Convert a well-formed (but not necessarily valid) XML string into a JSONObject. Some information may be lost in this transformation because JSON is a data format and XML is a document format.
* XML uses elements, attributes, and content text, while JSON uses unordered collections of name/value pairs and arrays of values. JSON does not does not like to distinguish between elements and
* attributes. Sequences of similar elements are represented as JSONArrays. Content text may be placed in a "content" member. Comments, prologs, DTDs, and <code><[ [ ]]></code> are ignored.
*
* All values are converted as strings, for 1, 01, 29.0 will not be coerced to numbers but will instead be the exact value as seen in the XML document.
*
* @param string The source string.
* @param keepStrings If true, then values will not be coerced into boolean or numeric values and will instead be left as strings
* @return A JSONObject containing the structured data from the XML string.
* @throws JSONException Thrown if there is an errors while parsing the string
*/
public static JSONObject toJSONObject(String string, boolean keepStrings) throws JSONException {
JSONObject jo = new JSONObject();
XMLTokener x = new XMLTokener(string);
while (x.more() && x.skipPast("<")) {
parse(x, jo, null, keepStrings);
}
return jo;
}
/**
* Convert a JSONObject into a well-formed, element-normal XML string.
*
* @param object A JSONObject.
* @return A string.
* @throws JSONException Thrown if there is an error parsing the string
*/
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 Thrown if there is an error parsing the string
*/
public static String toString(Object object, String tagName) throws JSONException {
StringBuilder sb = new StringBuilder();
JSONArray ja;
JSONObject jo;
String key;
Iterator<String> keys;
String string;
Object value;
if (object instanceof JSONObject) {
// Emit <tagName>
if (tagName != null) {
sb.append('<');
sb.append(tagName);
sb.append('>');
}
// Loop thru the keys.
jo = (JSONObject) object;
keys = jo.keySet().iterator();
while (keys.hasNext()) {
key = keys.next();
value = jo.get(key);
if (value == null) {
value = "";
} else if (value.getClass().isArray()) {
value = new JSONArray(value);
}
string = value instanceof String ? (String) value : null;
// Emit content in body
if ("content".equals(key)) {
if (value instanceof JSONArray) {
ja = (JSONArray) value;
int i = 0;
for (Object val : ja) {
if (i > 0) {
sb.append('\n');
}
sb.append(escape(val.toString()));
i++;
}
} else {
sb.append(escape(value.toString()));
}
// Emit an array of similar keys
} else if (value instanceof JSONArray) {
ja = (JSONArray) value;
for (Object val : ja) {
if (val instanceof JSONArray) {
sb.append('<');
sb.append(key);
sb.append('>');
sb.append(toString(val));
sb.append("</");
sb.append(key);
sb.append('>');
} else {
sb.append(toString(val, 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();
}
if (object != null) {
if (object.getClass().isArray()) {
object = new JSONArray(object);
}
if (object instanceof JSONArray) {
ja = (JSONArray) object;
for (Object val : ja) {
// XML does not have good support for arrays. If an array
// appears in a place where XML is lacking, synthesize an
// <array> element.
sb.append(toString(val, tagName == null ? "array" : tagName));
}
return sb.toString();
}
}
string = (object == null) ? "null" : escape(object.toString());
return (tagName == null) ? "\"" + string + "\"" : (string.length() == 0) ? "<" + tagName + "/>" : "<" + tagName + ">" + string + "</" + tagName + ">";
}
}