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A CSS parser which implements SAC (the Simple API for CSS).
/*
* Copyright (C) 1999-2018 David Schweinsberg.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.steadystate.css.dom;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.io.StringReader;
import java.net.URI;
import java.net.URISyntaxException;
import org.w3c.css.sac.CSSException;
import org.w3c.css.sac.InputSource;
import org.w3c.css.sac.SACMediaList;
import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.css.CSSImportRule;
import org.w3c.dom.css.CSSRule;
import org.w3c.dom.css.CSSRuleList;
import org.w3c.dom.css.CSSStyleSheet;
import org.w3c.dom.stylesheets.MediaList;
import org.w3c.dom.stylesheets.StyleSheet;
import com.steadystate.css.format.CSSFormat;
import com.steadystate.css.format.CSSFormatable;
import com.steadystate.css.parser.CSSOMParser;
import com.steadystate.css.util.LangUtils;
import com.steadystate.css.util.ThrowCssExceptionErrorHandler;
/**
* Implementation of {@link CSSStyleSheet}.
*
* @author David Schweinsberg
* @author rbri
*/
public class CSSStyleSheetImpl implements CSSStyleSheet, CSSFormatable, Serializable {
private static final long serialVersionUID = -2300541300646796363L;
private boolean disabled_;
private Node ownerNode_;
private StyleSheet parentStyleSheet_;
private String href_;
private String title_;
private MediaList media_;
private CSSRule ownerRule_;
private boolean readOnly_;
private CSSRuleList cssRules_;
private String baseUri_;
public void setMedia(final MediaList media) {
media_ = media;
}
private String getBaseUri() {
return baseUri_;
}
public void setBaseUri(final String baseUri) {
baseUri_ = baseUri;
}
public CSSStyleSheetImpl() {
super();
}
public String getType() {
return "text/css";
}
public boolean getDisabled() {
return disabled_;
}
/**
* We will need to respond more fully if a stylesheet is disabled, probably
* by generating an event for the main application.
*/
public void setDisabled(final boolean disabled) {
disabled_ = disabled;
}
public Node getOwnerNode() {
return ownerNode_;
}
public StyleSheet getParentStyleSheet() {
return parentStyleSheet_;
}
public String getHref() {
return href_;
}
public String getTitle() {
return title_;
}
public MediaList getMedia() {
return media_;
}
public CSSRule getOwnerRule() {
return ownerRule_;
}
public CSSRuleList getCssRules() {
if (cssRules_ == null) {
cssRules_ = new CSSRuleListImpl();
}
return cssRules_;
}
public int insertRule(final String rule, final int index) throws DOMException {
if (readOnly_) {
throw new DOMExceptionImpl(
DOMException.NO_MODIFICATION_ALLOWED_ERR,
DOMExceptionImpl.READ_ONLY_STYLE_SHEET);
}
try {
final InputSource is = new InputSource(new StringReader(rule));
final CSSOMParser parser = new CSSOMParser();
parser.setParentStyleSheet(this);
parser.setErrorHandler(ThrowCssExceptionErrorHandler.INSTANCE);
final CSSRule r = parser.parseRule(is);
if (r == null) {
// this should neven happen because of the ThrowCssExceptionErrorHandler
throw new DOMExceptionImpl(
DOMException.SYNTAX_ERR,
DOMExceptionImpl.SYNTAX_ERROR,
"Parsing rule '" + rule + "' failed.");
}
if (getCssRules().getLength() > 0) {
// We need to check that this type of rule can legally go into
// the requested position.
int msg = -1;
if (r.getType() == CSSRule.CHARSET_RULE) {
// Index must be 0, and there can be only one charset rule
if (index != 0) {
msg = DOMExceptionImpl.CHARSET_NOT_FIRST;
}
else if (getCssRules().item(0).getType() == CSSRule.CHARSET_RULE) {
msg = DOMExceptionImpl.CHARSET_NOT_UNIQUE;
}
}
else if (r.getType() == CSSRule.IMPORT_RULE) {
// Import rules must preceed all other rules (except
// charset rules)
if (index <= getCssRules().getLength()) {
for (int i = 0; i < index; i++) {
final int rt = getCssRules().item(i).getType();
if ((rt != CSSRule.CHARSET_RULE) && (rt != CSSRule.IMPORT_RULE)) {
msg = DOMExceptionImpl.IMPORT_NOT_FIRST;
break;
}
}
}
}
else {
if (index <= getCssRules().getLength()) {
for (int i = index; i < getCssRules().getLength(); i++) {
final int rt = getCssRules().item(i).getType();
if ((rt == CSSRule.CHARSET_RULE) || (rt == CSSRule.IMPORT_RULE)) {
msg = DOMExceptionImpl.INSERT_BEFORE_IMPORT;
break;
}
}
}
}
if (msg > -1) {
throw new DOMExceptionImpl(DOMException.HIERARCHY_REQUEST_ERR, msg);
}
}
// Insert the rule into the list of rules
((CSSRuleListImpl) getCssRules()).insert(r, index);
}
catch (final IndexOutOfBoundsException e) {
throw new DOMExceptionImpl(
DOMException.INDEX_SIZE_ERR,
DOMExceptionImpl.INDEX_OUT_OF_BOUNDS,
e.getMessage());
}
catch (final CSSException e) {
throw new DOMExceptionImpl(
DOMException.SYNTAX_ERR,
DOMExceptionImpl.SYNTAX_ERROR,
e.getMessage());
}
catch (final IOException e) {
throw new DOMExceptionImpl(
DOMException.SYNTAX_ERR,
DOMExceptionImpl.SYNTAX_ERROR,
e.getMessage());
}
return index;
}
public void deleteRule(final int index) throws DOMException {
if (readOnly_) {
throw new DOMExceptionImpl(
DOMException.NO_MODIFICATION_ALLOWED_ERR,
DOMExceptionImpl.READ_ONLY_STYLE_SHEET);
}
try {
((CSSRuleListImpl) getCssRules()).delete(index);
}
catch (final IndexOutOfBoundsException e) {
throw new DOMExceptionImpl(
DOMException.INDEX_SIZE_ERR,
DOMExceptionImpl.INDEX_OUT_OF_BOUNDS,
e.getMessage());
}
}
public boolean isReadOnly() {
return readOnly_;
}
public void setReadOnly(final boolean b) {
readOnly_ = b;
}
public void setOwnerNode(final Node ownerNode) {
ownerNode_ = ownerNode;
}
public void setParentStyleSheet(final StyleSheet parentStyleSheet) {
parentStyleSheet_ = parentStyleSheet;
}
public void setHref(final String href) {
href_ = href;
}
public void setTitle(final String title) {
title_ = title;
}
public void setMediaText(final String mediaText) {
final InputSource source = new InputSource(new StringReader(mediaText));
try {
final CSSOMParser parser = new CSSOMParser();
final SACMediaList sml = parser.parseMedia(source);
media_ = new MediaListImpl(sml);
}
catch (final IOException e) {
// TODO handle exception
}
}
public void setOwnerRule(final CSSRule ownerRule) {
ownerRule_ = ownerRule;
}
public void setCssRules(final CSSRuleList rules) {
cssRules_ = rules;
}
/**
* Same as {@link #getCssText(CSSFormat)} but using the default format.
*
* @return the formated string
*/
public String getCssText() {
return getCssText(null);
}
/**
* {@inheritDoc}
*/
public String getCssText(final CSSFormat format) {
final CSSRuleList rules = getCssRules();
if (rules instanceof CSSFormatable) {
return ((CSSRuleListImpl) rules).getCssText(format);
}
return getCssRules().toString();
}
@Override
public String toString() {
return getCssText(null);
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof CSSStyleSheet)) {
return false;
}
final CSSStyleSheet css = (CSSStyleSheet) obj;
boolean eq = LangUtils.equals(getCssRules(), css.getCssRules());
eq = eq && (getDisabled() == css.getDisabled());
eq = eq && LangUtils.equals(getHref(), css.getHref());
eq = eq && LangUtils.equals(getMedia(), css.getMedia());
// TODO implement some reasonful equals method for ownerNode
// eq = eq && Utils.equals(getOwnerNode(), css.getOwnerNode());
// don't use ownerNode and parentStyleSheet in equals()
// recursive loop -> stack overflow!
eq = eq && LangUtils.equals(getTitle(), css.getTitle());
return eq;
}
@Override
public int hashCode() {
int hash = LangUtils.HASH_SEED;
hash = LangUtils.hashCode(hash, baseUri_);
hash = LangUtils.hashCode(hash, cssRules_);
hash = LangUtils.hashCode(hash, disabled_);
hash = LangUtils.hashCode(hash, href_);
hash = LangUtils.hashCode(hash, media_);
hash = LangUtils.hashCode(hash, ownerNode_);
// don't use ownerNode and parentStyleSheet in hashCode()
// recursive loop -> stack overflow!
hash = LangUtils.hashCode(hash, readOnly_);
hash = LangUtils.hashCode(hash, title_);
return hash;
}
private void writeObject(final ObjectOutputStream out) throws IOException {
out.writeObject(baseUri_);
out.writeObject(cssRules_);
out.writeBoolean(disabled_);
out.writeObject(href_);
out.writeObject(media_);
// TODO ownerNode may not be serializable!
// out.writeObject(ownerNode);
out.writeBoolean(readOnly_);
out.writeObject(title_);
}
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
baseUri_ = (String) in.readObject();
cssRules_ = (CSSRuleList) in.readObject();
if (cssRules_ != null) {
for (int i = 0; i < cssRules_.getLength(); i++) {
final CSSRule cssRule = cssRules_.item(i);
if (cssRule instanceof AbstractCSSRuleImpl) {
((AbstractCSSRuleImpl) cssRule).setParentStyleSheet(this);
}
}
}
disabled_ = in.readBoolean();
href_ = (String) in.readObject();
media_ = (MediaList) in.readObject();
// TODO ownerNode may not be serializable!
// ownerNode = (Node) in.readObject();
readOnly_ = in.readBoolean();
title_ = (String) in.readObject();
}
/**
* Imports referenced CSSStyleSheets.
*
* @param recursive true if the import should be done
* recursively, false otherwise
*/
public void importImports(final boolean recursive) throws DOMException {
for (int i = 0; i < getCssRules().getLength(); i++) {
final CSSRule cssRule = getCssRules().item(i);
if (cssRule.getType() == CSSRule.IMPORT_RULE) {
final CSSImportRule cssImportRule = (CSSImportRule) cssRule;
try {
final URI importURI = new URI(getBaseUri()).resolve(cssImportRule.getHref());
final CSSStyleSheetImpl importedCSS = (CSSStyleSheetImpl)
new CSSOMParser().parseStyleSheet(new InputSource(
importURI.toString()), null, importURI.toString());
if (recursive) {
importedCSS.importImports(recursive);
}
final MediaList mediaList = cssImportRule.getMedia();
if (mediaList.getLength() == 0) {
mediaList.appendMedium("all");
}
final CSSMediaRuleImpl cssMediaRule = new CSSMediaRuleImpl(this, null, mediaList);
cssMediaRule.setRuleList((CSSRuleListImpl) importedCSS.getCssRules());
deleteRule(i);
((CSSRuleListImpl) getCssRules()).insert(cssMediaRule, i);
}
catch (final URISyntaxException e) {
throw new DOMException(DOMException.SYNTAX_ERR, e.getLocalizedMessage());
}
catch (final IOException e) {
// TODO handle exception
}
}
}
}
}