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Parses XML to PDF, with CSS support, using iText
/*
* $Id: 0d7fef2ece14b429d9d631faf828b2b8f38f8a8c $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 iText Group NV
* Authors: Bruno Lowagie, Balder Van Camp, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS.
*
* This program 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 Affero General Public License for more
* details. You should have received a copy of the GNU Affero General Public
* License along with this program; if not, see http://www.gnu.org/licenses or
* write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License, a
* covered work must retain the producer line in every PDF that is created or
* manipulated using iText.
*
* You can be released from the requirements of the license by purchasing a
* commercial license. Buying such a license is mandatory as soon as you develop
* commercial activities involving the iText software without disclosing the
* source code of your own applications. These activities include: offering paid
* services to customers as an ASP, serving PDFs on the fly in a web
* application, shipping iText with a closed source product.
*
* For more information, please contact iText Software Corp. at this address:
* [email protected]
*/
package com.itextpdf.tool.xml.css.parser;
import com.itextpdf.tool.xml.css.CssFile;
import com.itextpdf.tool.xml.css.CssUtils;
import com.itextpdf.tool.xml.css.parser.state.CommentEnd;
import com.itextpdf.tool.xml.css.parser.state.CommentInside;
import com.itextpdf.tool.xml.css.parser.state.CommentStart;
import com.itextpdf.tool.xml.css.parser.state.Properties;
import com.itextpdf.tool.xml.css.parser.state.Rule;
import com.itextpdf.tool.xml.css.parser.state.Unknown;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* State controller for CSS Processing
* @author redlab_b
*
*/
public class CssStateController {
private State current;
private State previous;
private final State commentEnd;
private final State commentStart;
private final State commentInside;
private final StringBuilder buffer;
private final State properties;
private final State unknown;
private String currentSelector;
private final State rule;
private final CssUtils utils;
private final CssFile css;
/**
* @param file the CssFile
*
*/
public CssStateController(final CssFile file) {
this.css = file;
utils = CssUtils.getInstance();
buffer = new StringBuilder();
commentStart = new CommentStart(this);
commentEnd = new CommentEnd(this);
commentInside = new CommentInside(this);
unknown = new Unknown(this);
properties = new Properties(this);
rule = new Rule(this);
current = unknown;
}
/**
* Appends a character to the buffer.
* @param c the char to append to the buffer.
*/
public void append(final char c) {
this.buffer.append(c);
}
/**
* Sets the state to the previous state
*/
public void previous() {
this.current = previous;
}
/**
* Processes the character, delegates to states.
*
* @param c a character that needs to be processed
*/
public void process(final char c) {
current.process(c);
}
private void processProps(final String props) {
String[] split = props.split(";");
Map map = new LinkedHashMap();
for (String prop : split) {
String[] propSplit = prop.split(":");
if (propSplit.length == 2) {
map.put(utils.stripDoubleSpacesTrimAndToLowerCase(propSplit[0]), utils.stripDoubleSpacesAndTrim(propSplit[1]));
}
}
if (currentSelector.contains(",")) {
String[] selectors = currentSelector.split(",");
//check for rules like p, {…}
for (int i = 0; i < selectors.length; i++) {
selectors[i] = utils.stripDoubleSpacesAndTrim(selectors[i]);
if (selectors[i].length() == 0)
return;
}
for (String selector : selectors) {
//if any separated selector has errors, all others become invalid.
//in this case we just clear map, it is the easies way to support this.
if (!css.add(selector, map))
map.clear();
}
} else {
css.add(utils.stripDoubleSpacesAndTrim(currentSelector), map);
}
}
private void setState(final State state) {
this.current = state;
}
private void setPrevious() {
this.previous = current;
}
/**
*
*/
public void stateCommentEnd() {
setState(commentEnd);
}
/**
*
*/
public void stateCommentInside() {
setState(commentInside);
}
/**
*
*/
public void stateCommentStart() {
setPrevious();
setState(commentStart);
}
/**
*
*/
public void stateProperties() {
previous = current;
setState(properties);
}
/**
*
*/
public void stateUnknown() {
setState(unknown);
}
/**
*
*/
public void stateRule() {
setState(rule);
}
/**
*
*/
public void storeSelector() {
this.currentSelector = buffer.toString();
buffer.setLength(0);
}
/**
*
*/
public void storeProperties() {
processProps(buffer.toString());
buffer.setLength(0);
}
}