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pdfHTML is an iText 7 add-on that lets you to parse (X)HTML snippets and the associated CSS and converts
them to PDF.
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, 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.html2pdf.css.selector.item;
import com.itextpdf.html2pdf.css.CssConstants;
import com.itextpdf.html2pdf.css.parse.CssSelectorParser;
import com.itextpdf.html2pdf.css.selector.CssSelector;
import com.itextpdf.html2pdf.css.selector.ICssSelector;
import com.itextpdf.html2pdf.html.node.ICustomElementNode;
import com.itextpdf.html2pdf.html.node.IElementNode;
import com.itextpdf.html2pdf.html.node.INode;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* {@link ICssSelectorItem} implementation for pseudo class selectors.
*/
public class CssPseudoClassSelectorItem implements ICssSelectorItem {
/**
* The pseudo class.
*/
private String pseudoClass;
/**
* The arguments.
*/
protected String arguments;
/**
* Creates a new {@link CssPseudoClassSelectorItem} instance.
*
* @param pseudoClass the pseudo class name
* @deprecated not intended for public use {@link CssPseudoClassSelectorItem#create(String)} instead.
* This class will be abstract and this constructor will be protected in the next major release.
*/
@Deprecated
public CssPseudoClassSelectorItem(String pseudoClass) {
this(pseudoClass, "");
}
protected CssPseudoClassSelectorItem(String pseudoClass, String arguments) {
this.pseudoClass = pseudoClass;
this.arguments = arguments;
}
public static CssPseudoClassSelectorItem create(String fullSelectorString) {
int indexOfParentheses = fullSelectorString.indexOf('(');
String pseudoClass;
String arguments;
if (indexOfParentheses == -1) {
pseudoClass = fullSelectorString;
arguments = "";
} else {
pseudoClass = fullSelectorString.substring(0, indexOfParentheses);
arguments = fullSelectorString.substring(indexOfParentheses + 1, fullSelectorString.length() - 1).trim();
}
return create(pseudoClass, arguments);
}
public static CssPseudoClassSelectorItem create(String pseudoClass, String arguments) {
switch (pseudoClass) {
case CssConstants.FIRST_CHILD:
return FirstChildSelectorItem.getInstance();
case CssConstants.LAST_CHILD:
return LastChildSelectorItem.getInstance();
case CssConstants.NTH_CHILD:
return new NthChildSelectorItem(arguments);
case CssConstants.NOT:
CssSelector selector = new CssSelector(arguments);
for (ICssSelectorItem item : selector.getSelectorItems()) {
if (item instanceof NotSelectorItem || item instanceof CssPseudoElementSelectorItem) {
return null;
}
}
return new NotSelectorItem(selector);
case CssConstants.LINK:
return new AlwaysApplySelectorItem(pseudoClass, arguments);
case CssConstants.ACTIVE:
case CssConstants.FOCUS:
case CssConstants.HOVER:
case CssConstants.TARGET:
case CssConstants.VISITED:
return new AlwaysNotApplySelectorItem(pseudoClass, arguments);
default:
return new CssPseudoClassSelectorItem(pseudoClass, arguments);
}
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.css.selector.item.ICssSelectorItem#getSpecificity()
*/
@Override
public int getSpecificity() {
return CssSpecificityConstants.CLASS_SPECIFICITY;
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.css.selector.item.ICssSelectorItem#matches(com.itextpdf.html2pdf.html.node.INode)
*/
@Override
public boolean matches(INode node) {
return false;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return ":" + pseudoClass + (!arguments.isEmpty() ? "(" + arguments + ")" : "");
}
public String getPseudoClass() {
return pseudoClass;
}
private static class ChildSelectorItem extends CssPseudoClassSelectorItem {
/**
* Creates a new {@link CssPseudoClassSelectorItem} instance.
*
* @param pseudoClass the pseudo class name
*/
ChildSelectorItem(String pseudoClass) {
super(pseudoClass);
}
ChildSelectorItem(String pseudoClass, String arguments) {
super(pseudoClass, arguments);
}
/**
* Gets the all the siblings of a child node.
*
* @param node the child node
* @return the sibling nodes
*/
List getAllSiblings(INode node) {
INode parentElement = node.parentNode();
if (parentElement != null) {
List childrenUnmodifiable = parentElement.childNodes();
List children = new ArrayList(childrenUnmodifiable.size());
for (INode iNode : childrenUnmodifiable) {
if (iNode instanceof IElementNode)
children.add(iNode);
}
return children;
}
return Collections.emptyList();
}
}
private static class FirstChildSelectorItem extends ChildSelectorItem {
private static final FirstChildSelectorItem instance = new FirstChildSelectorItem();
private FirstChildSelectorItem() {
super(CssConstants.FIRST_CHILD);
}
public static FirstChildSelectorItem getInstance() {
return instance;
}
@Override
public boolean matches(INode node) {
if (!(node instanceof IElementNode) || node instanceof ICustomElementNode) {
return false;
}
List children = getAllSiblings(node);
return !children.isEmpty() && node.equals(children.get(0));
}
}
private static class LastChildSelectorItem extends ChildSelectorItem {
private static final LastChildSelectorItem instance = new LastChildSelectorItem();
private LastChildSelectorItem() {
super(CssConstants.LAST_CHILD);
}
public static LastChildSelectorItem getInstance() {
return instance;
}
@Override
public boolean matches(INode node) {
if (!(node instanceof IElementNode) || node instanceof ICustomElementNode) {
return false;
}
List children = getAllSiblings(node);
return !children.isEmpty() && node.equals(children.get(children.size() - 1));
}
}
private static class NthChildSelectorItem extends ChildSelectorItem {
/**
* The nth child A.
*/
private int nthChildA;
/**
* The nth child B.
*/
private int nthChildB;
NthChildSelectorItem(String arguments) {
super(CssConstants.NTH_CHILD, arguments);
getNthChildArguments();
}
@Override
public boolean matches(INode node) {
if (!(node instanceof IElementNode) || node instanceof ICustomElementNode) {
return false;
}
List children = getAllSiblings(node);
return !children.isEmpty() && resolveNthChild(node, children);
}
/**
* Gets the nth child arguments.
*/
private void getNthChildArguments() {
if (arguments.matches("((-|\\+)?[0-9]*n(\\s*(-|\\+)\\s*[0-9]+)?|(-|\\+)?[0-9]+|odd|even)")) {
if (arguments.equals("odd")) {
this.nthChildA = 2;
this.nthChildB = 1;
} else if (arguments.equals("even")) {
this.nthChildA = 2;
this.nthChildB = 0;
} else {
int indexOfN = arguments.indexOf('n');
if (indexOfN == -1) {
this.nthChildA = 0;
this.nthChildB = Integer.valueOf(arguments);
} else {
String aParticle = arguments.substring(0, indexOfN).trim();
if (aParticle.isEmpty())
this.nthChildA = 0;
else if (aParticle.length() == 1 && !Character.isDigit(aParticle.charAt(0)))
this.nthChildA = aParticle.equals("+") ? 1 : -1;
else
this.nthChildA = Integer.valueOf(aParticle);
String bParticle = arguments.substring(indexOfN + 1).trim();
if (!bParticle.isEmpty())
this.nthChildB = Integer.valueOf(bParticle.charAt(0) + bParticle.substring(1).trim());
else
this.nthChildB = 0;
}
}
} else {
this.nthChildA = 0;
this.nthChildB = 0;
}
}
/**
* Resolves the nth child.
*
* @param node a node
* @param children the children
* @return true, if successful
*/
private boolean resolveNthChild(INode node, List children) {
if (!children.contains(node))
return false;
if (this.nthChildA > 0) {
int temp = children.indexOf(node) + 1 - this.nthChildB;
return temp >= 0 && temp % this.nthChildA == 0;
} else if (this.nthChildA < 0) {
int temp = children.indexOf(node) + 1 - this.nthChildB;
return temp <= 0 && temp % this.nthChildA == 0;
} else
return (children.indexOf(node) + 1) - this.nthChildB == 0;
}
}
//@TODO This class was made public because we need to detect to arguments contains unsupported pseudo classes
//revert the changes when the task DEVSIX-1440 is done
public static class NotSelectorItem extends CssPseudoClassSelectorItem {
private ICssSelector argumentsSelector;
NotSelectorItem(ICssSelector argumentsSelector) {
super(CssConstants.NOT, argumentsSelector.toString());
this.argumentsSelector = argumentsSelector;
}
public List getArgumentsSelector() {
return CssSelectorParser.parseSelectorItems(arguments);
}
@Override
public boolean matches(INode node) {
return !argumentsSelector.matches(node);
}
}
private static class AlwaysApplySelectorItem extends CssPseudoClassSelectorItem {
AlwaysApplySelectorItem(String pseudoClass, String arguments) {
super(pseudoClass, arguments);
}
@Override
public boolean matches(INode node) {
return true;
}
}
private static class AlwaysNotApplySelectorItem extends CssPseudoClassSelectorItem {
AlwaysNotApplySelectorItem(String pseudoClass, String arguments) {
super(pseudoClass, arguments);
}
@Override
public boolean matches(INode node) {
return false;
}
}
}