org.opencms.json.XMLTokener Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH & Co. KG, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This file is based on:
* org.json.XMLTokener
* from the JSON in Java implementation.
*
* Copyright (c) 2002 JSON.org
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* The Software shall be used for Good, not Evil.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.opencms.json;
/**
* The XMLTokener extends the JSONTokener to provide additional methods
* for the parsing of XML texts.
*
*/
public class XMLTokener extends JSONTokener {
/** The table of ENTITY values. It initially contains Character values for
* amp, apos, gt, lt, quot.
*/
public static final java.util.HashMap ENTITY;
/**
* Construct an XMLTokener from a string.
*
* @param s a source string
*/
public XMLTokener(String s) {
super(s);
}
static {
ENTITY = new java.util.HashMap(8);
ENTITY.put("amp", XML.AMP);
ENTITY.put("apos", XML.APOS);
ENTITY.put("gt", XML.GT);
ENTITY.put("lt", XML.LT);
ENTITY.put("quot", XML.QUOT);
}
/**
* Get the text in the CDATA block.
*
* @return the string up to the ]]>
* @throws JSONException if the ]]> is not found
*/
public String nextCDATA() throws JSONException {
char c;
int i;
StringBuffer sb = new StringBuffer();
for (;;) {
c = next();
if (c == 0) {
throw syntaxError("Unclosed CDATA");
}
sb.append(c);
i = sb.length() - 3;
if ((i >= 0) && (sb.charAt(i) == ']') && (sb.charAt(i + 1) == ']') && (sb.charAt(i + 2) == '>')) {
sb.setLength(i);
return sb.toString();
}
}
}
/**
* Get the next XML outer token, trimming whitespace.
*
* There are two kinds of tokens: the '<' character which begins a markup tag, and the content
* text between markup tags.
*
* @return a string, or a '<' Character, or null if there is no more source text
* @throws JSONException if something goes wrong
*/
public Object nextContent() throws JSONException {
char c;
StringBuffer sb;
do {
c = next();
} while (Character.isWhitespace(c));
if (c == 0) {
return null;
}
if (c == '<') {
return XML.LT;
}
sb = new StringBuffer();
for (;;) {
if ((c == '<') || (c == 0)) {
back();
return sb.toString().trim();
}
if (c == '&') {
sb.append(nextEntity(c));
} else {
sb.append(c);
}
c = next();
}
}
/**
* Return the next ENTITY. These entities are translated to Characters:
* & ' > < ".
*
* @param a an ampersand character
* @return a Character or an entity String if the entity is not recognized
* @throws JSONException if missing ';' in XML entity
*/
public Object nextEntity(char a) throws JSONException {
StringBuffer sb = new StringBuffer();
for (;;) {
char c = next();
if (Character.isLetterOrDigit(c) || (c == '#')) {
sb.append(Character.toLowerCase(c));
} else if (c == ';') {
break;
} else {
throw syntaxError("Missing ';' in XML ENTITY: &" + sb);
}
}
String s = sb.toString();
Object e = ENTITY.get(s);
return e != null ? e : a + s + ";";
}
/**
* Returns the next XML meta token. This is used for skipping over
* and structures.
*
* @return syntax characters (< > / = ! ?) are returned as
* Character, and strings and names are returned as Boolean. We don't care
* what the values actually are
* @throws JSONException if a string is not properly closed or if the XML
* is badly structured
*/
public Object nextMeta() throws JSONException {
char c;
char q;
do {
c = next();
} while (Character.isWhitespace(c));
switch (c) {
case 0:
throw syntaxError("Misshaped meta tag");
case '<':
return XML.LT;
case '>':
return XML.GT;
case '/':
return XML.SLASH;
case '=':
return XML.EQ;
case '!':
return XML.BANG;
case '?':
return XML.QUEST;
case '"':
case '\'':
q = c;
for (;;) {
c = next();
if (c == 0) {
throw syntaxError("Unterminated string");
}
if (c == q) {
return Boolean.TRUE;
}
}
default:
for (;;) {
c = next();
if (Character.isWhitespace(c)) {
return Boolean.TRUE;
}
switch (c) {
case 0:
case '<':
case '>':
case '/':
case '=':
case '!':
case '?':
case '"':
case '\'':
back();
return Boolean.TRUE;
default:
}
}
}
}
/**
* Get the next XML Token.
*
* These tokens are found inside of angle
* brackets. It may be one of these characters: / > = ! ? or it
* may be a string wrapped in single quotes or double quotes, or it may be a
* name.
*
* @return a string or a Character
* @throws JSONException if the XML is not well formed
*/
public Object nextToken() throws JSONException {
char c;
char q;
StringBuffer sb;
do {
c = next();
} while (Character.isWhitespace(c));
switch (c) {
case 0:
throw syntaxError("Misshaped element");
case '<':
throw syntaxError("Misplaced '<'");
case '>':
return XML.GT;
case '/':
return XML.SLASH;
case '=':
return XML.EQ;
case '!':
return XML.BANG;
case '?':
return XML.QUEST;
// Quoted string
case '"':
case '\'':
q = c;
sb = new StringBuffer();
for (;;) {
c = next();
if (c == 0) {
throw syntaxError("Unterminated string");
}
if (c == q) {
return sb.toString();
}
if (c == '&') {
sb.append(nextEntity(c));
} else {
sb.append(c);
}
}
default:
// Name
sb = new StringBuffer();
for (;;) {
sb.append(c);
c = next();
if (Character.isWhitespace(c)) {
return sb.toString();
}
switch (c) {
case 0:
return sb.toString();
case '>':
case '/':
case '=':
case '!':
case '?':
case '[':
case ']':
back();
return sb.toString();
case '<':
case '"':
case '\'':
throw syntaxError("Bad character in a name");
default:
}
}
}
}
/**
* Skip characters until past the requested string.
*
* If it is not found, we are left at the end of the source with a result of false.
*
* @param to a string to skip past
* @return the truth
* @throws JSONException if something goes wrong
*/
public boolean skipPast(String to) throws JSONException {
boolean b;
char c;
int i;
int j;
int offset = 0;
int n = to.length();
char[] circle = new char[n];
/*
* First fill the circle buffer with as many characters as are in the
* to string. If we reach an early end, bail.
*/
for (i = 0; i < n; i += 1) {
c = next();
if (c == 0) {
return false;
}
circle[i] = c;
}
/*
* We will loop, possibly for all of the remaining characters.
*/
for (;;) {
j = offset;
b = true;
/*
* Compare the circle buffer with the to string.
*/
for (i = 0; i < n; i += 1) {
if (circle[j] != to.charAt(i)) {
b = false;
break;
}
j += 1;
if (j >= n) {
j -= n;
}
}
/*
* If we exit the loop with b intact, then victory is ours.
*/
if (b) {
return true;
}
/*
* Get the next character. If there isn't one, then defeat is ours.
*/
c = next();
if (c == 0) {
return false;
}
/*
* Shove the character in the circle buffer and advance the
* circle offset. The offset is mod n.
*/
circle[offset] = c;
offset += 1;
if (offset >= n) {
offset -= n;
}
}
}
}