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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
/*
* Condition.java
* Copyright (c) 2004, 2005 Torbjoern Gannholm
*
* This program 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 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
package com.openhtmltopdf.css.newmatch;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.openhtmltopdf.css.extend.AttributeResolver;
import com.openhtmltopdf.css.extend.TreeResolver;
import com.openhtmltopdf.css.parser.CSSParseException;
/**
* Part of a Selector
*
* @author tstgm
*/
abstract class Condition {
abstract boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes);
abstract boolean disablesStyleCache();
/**
* the CSS condition [attribute]
*
* @param name PARAM
* @return Returns
*/
static Condition createAttributeExistsCondition(String namespaceURI, String name) {
return new AttributeExistsCondition(namespaceURI, name);
}
/**
* the CSS condition [attribute^=value]
*/
static Condition createAttributePrefixCondition(String namespaceURI, String name, String value) {
return new AttributePrefixCondition(namespaceURI, name, value);
}
/**
* the CSS condition [attribute$=value]
*/
static Condition createAttributeSuffixCondition(String namespaceURI, String name, String value) {
return new AttributeSuffixCondition(namespaceURI, name, value);
}
/**
* the CSS condition [attribute*=value]
*/
static Condition createAttributeSubstringCondition(String namespaceURI, String name, String value) {
return new AttributeSubstringCondition(namespaceURI, name, value);
}
/**
* the CSS condition [attribute=value]
*/
static Condition createAttributeEqualsCondition(String namespaceURI, String name, String value) {
return new AttributeEqualsCondition(namespaceURI, name, value);
}
/**
* the CSS condition [attribute~=value]
*
* @param name PARAM
* @param value PARAM
* @return Returns
*/
static Condition createAttributeMatchesListCondition(String namespaceURI, String name, String value) {
return new AttributeMatchesListCondition(namespaceURI, name, value);
}
/**
* the CSS condition [attribute|=value]
*
* @param name PARAM
* @param value PARAM
* @return Returns
*/
static Condition createAttributeMatchesFirstPartCondition(String namespaceURI, String name, String value) {
return new AttributeMatchesFirstPartCondition(namespaceURI, name, value);
}
/**
* the CSS condition .class
*
* @param className PARAM
* @return Returns
*/
static Condition createClassCondition(String className) {
return new ClassCondition(className);
}
/**
* the CSS condition #ID
*
* @param id PARAM
* @return Returns
*/
static Condition createIDCondition(String id) {
return new IDCondition(id);
}
/**
* the CSS condition lang(Xx)
*
* @param lang PARAM
* @return Returns
*/
static Condition createLangCondition(String lang) {
return new LangCondition(lang);
}
/**
* the CSS condition that element has pseudo-class :first-child
*
* @return Returns
*/
static Condition createFirstChildCondition() {
return new FirstChildCondition();
}
/**
* the CSS condition that element has pseudo-class :last-child
*
* @return Returns
*/
static Condition createLastChildCondition() {
return new LastChildCondition();
}
/**
* the CSS condition that element has pseudo-class :nth-child(an+b)
*
* @param number PARAM
* @return Returns
*/
static Condition createNthChildCondition(String number) {
return NthChildCondition.fromString(number);
}
/**
* the CSS condition that element has pseudo-class :even
*
* @return Returns
*/
static Condition createEvenChildCondition() {
return new EvenChildCondition();
}
/**
* the CSS condition that element has pseudo-class :odd
*
* @return Returns
*/
static Condition createOddChildCondition() {
return new OddChildCondition();
}
/**
* the CSS condition that element has pseudo-class :link
*
* @return Returns
*/
static Condition createLinkCondition() {
return new LinkCondition();
}
/**
* for unsupported or invalid CSS
*
* @return Returns
*/
static Condition createUnsupportedCondition() {
return new UnsupportedCondition();
}
private static abstract class AttributeCompareCondition extends Condition {
protected String _namespaceURI;
protected String _name;
protected String _value;
protected abstract boolean compare(String attrValue, String conditionValue);
AttributeCompareCondition(String namespaceURI, String name, String value) {
_namespaceURI = namespaceURI;
_name = name;
_value = value;
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
if (attRes == null) {
return false;
}
String val = attRes.getAttributeValue(e, _namespaceURI, _name);
if (val == null) {
return false;
}
return compare(val, _value);
}
}
private static class AttributeExistsCondition extends AttributeCompareCondition {
AttributeExistsCondition(String namespaceURI, String name) {
super(namespaceURI, name, null);
}
@Override
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
if (attRes == null) {
return false;
}
String val = attRes.getAttributeValue(e, _namespaceURI, _name);
if (val == null) {
return false;
}
return true;
}
protected boolean compare(String attrValue, String conditionValue) {
throw new UnsupportedOperationException();
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class AttributeEqualsCondition extends AttributeCompareCondition {
AttributeEqualsCondition(String namespaceURI, String name, String value) {
super(namespaceURI, name, value);
}
protected boolean compare(String attrValue, String conditionValue) {
return attrValue.equals(conditionValue);
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class AttributePrefixCondition extends AttributeCompareCondition {
AttributePrefixCondition(String namespaceURI, String name, String value) {
super(namespaceURI, name, value);
}
protected boolean compare(String attrValue, String conditionValue) {
return attrValue.startsWith(conditionValue);
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class AttributeSuffixCondition extends AttributeCompareCondition {
AttributeSuffixCondition(String namespaceURI, String name, String value) {
super(namespaceURI, name, value);
}
protected boolean compare(String attrValue, String conditionValue) {
return attrValue.endsWith(conditionValue);
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class AttributeSubstringCondition extends AttributeCompareCondition {
AttributeSubstringCondition(String namespaceURI, String name, String value) {
super(namespaceURI, name, value);
}
protected boolean compare(String attrValue, String conditionValue) {
return attrValue.indexOf(conditionValue) > -1;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class AttributeMatchesListCondition extends AttributeCompareCondition {
AttributeMatchesListCondition(String namespaceURI, String name, String value) {
super(namespaceURI, name, value);
}
protected boolean compare(String attrValue, String conditionValue) {
String[] ca = split(attrValue, ' ');
boolean matched = false;
for (int j = 0; j < ca.length; j++) {
if (conditionValue.equals(ca[j])) {
matched = true;
}
}
return matched;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class AttributeMatchesFirstPartCondition extends AttributeCompareCondition {
AttributeMatchesFirstPartCondition(String namespaceURI, String name, String value) {
super(namespaceURI, name, value);
}
protected boolean compare(String attrValue, String conditionValue) {
String[] ca = split(attrValue, '-');
if (conditionValue.equals(ca[0])) {
return true;
}
return false;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class ClassCondition extends Condition {
private String _paddedClassName;
ClassCondition(String className) {
_paddedClassName = " " + className + " ";
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
if (attRes == null) {
return false;
}
String c = attRes.getClass(e);
if (c == null) {
return false;
}
// This is much faster than calling `split()` and comparing individual values in a loop.
// NOTE: In jQuery, for example, the attribute value first has whitespace normalized to spaces. But
// in an XML DOM, space normalization in attributes is supposed to have happened already.
return (" " + c + " ").indexOf(_paddedClassName) != -1;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class IDCondition extends Condition {
private String _id;
IDCondition(String id) {
_id = id;
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
if (attRes == null) {
return false;
}
if (!_id.equals(attRes.getID(e))) {
return false;
}
return true;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class LangCondition extends Condition {
private String _lang;
LangCondition(String lang) {
_lang = lang;
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
if (attRes == null) {
return false;
}
String lang = attRes.getLang(e);
if (lang == null) {
return false;
}
if(_lang.equalsIgnoreCase(lang)) {
return true;
}
String[] ca = split(lang, '-');
if (_lang.equalsIgnoreCase(ca[0])) {
return true;
}
return false;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class FirstChildCondition extends Condition {
FirstChildCondition() {
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
return treeRes.isFirstChildElement(e);
}
@Override
boolean disablesStyleCache() {
return true;
}
}
private static class LastChildCondition extends Condition {
LastChildCondition() {
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
return treeRes.isLastChildElement(e);
}
@Override
boolean disablesStyleCache() {
return true;
}
}
private static class NthChildCondition extends Condition {
private static final Pattern pattern = Pattern.compile("([-+]?)(\\d*)n(\\s*([-+])\\s*(\\d+))?");
private final int a;
private final int b;
NthChildCondition(int a, int b) {
this.a = a;
this.b = b;
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
// getPositionOfElement() starts at 0, CSS spec starts at 1
int position = treeRes.getPositionOfElement(e)+1;
position -= b;
if (a == 0) {
return position == 0;
} else if ((a < 0) && (position > 0)) {
return false; // n is negative
} else {
return position % a == 0;
}
}
static NthChildCondition fromString(String number) {
number = number.trim().toLowerCase();
if ("even".equals(number)) {
return new NthChildCondition(2, 0);
} else if ("odd".equals(number)) {
return new NthChildCondition(2, 1);
} else {
try {
return new NthChildCondition(0, Integer.parseInt(number));
} catch (NumberFormatException e) {
Matcher m = pattern.matcher(number);
if (!m.matches()) {
throw new CSSParseException("Invalid nth-child selector: " + number, -1);
} else {
int a = m.group(2).equals("") ? 1 : Integer.parseInt(m.group(2));
int b = (m.group(5) == null) ? 0 : Integer.parseInt(m.group(5));
if ("-".equals(m.group(1))) {
a *= -1;
}
if ("-".equals(m.group(4))) {
b *= -1;
}
return new NthChildCondition(a, b);
}
}
}
}
@Override
boolean disablesStyleCache() {
// We support even and odd nth-child conditions.
return this.a != 2 || (this.b != 1 && this.b != 0);
}
}
private static class EvenChildCondition extends Condition {
EvenChildCondition() {
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
int position = treeRes.getPositionOfElement(e);
return position >= 0 && position % 2 == 0;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class OddChildCondition extends Condition {
OddChildCondition() {
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
int position = treeRes.getPositionOfElement(e);
return position >= 0 && position % 2 == 1;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static class LinkCondition extends Condition {
LinkCondition() {
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
return attRes.isLink(e);
}
@Override
boolean disablesStyleCache() {
return false;
}
}
/**
* represents unsupported (or invalid) css, never matches
*/
private static class UnsupportedCondition extends Condition {
UnsupportedCondition() {
}
boolean matches(Object e, AttributeResolver attRes, TreeResolver treeRes) {
return false;
}
@Override
boolean disablesStyleCache() {
return false;
}
}
private static String[] split(String s, char ch) {
if (s.indexOf(ch) == -1) {
return new String[] { s };
} else {
List result = new ArrayList();
int last = 0;
int next = 0;
while ((next = s.indexOf(ch, last)) != -1) {
if (next != last) {
result.add(s.substring(last, next));
}
last = next + 1;
}
if (last != s.length()) {
result.add(s.substring(last));
}
return result.toArray(new String[result.size()]);
}
}
}