com.liferay.frontend.css.rtl.servlet.internal.converter.CSSRTLConverter Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* 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.
*/
package com.liferay.frontend.css.rtl.servlet.internal.converter;
import com.helger.commons.charset.CCharset;
import com.helger.css.ECSSVersion;
import com.helger.css.decl.CSSDeclaration;
import com.helger.css.decl.CSSExpression;
import com.helger.css.decl.CSSExpressionMemberFunction;
import com.helger.css.decl.CSSExpressionMemberTermSimple;
import com.helger.css.decl.CSSExpressionMemberTermURI;
import com.helger.css.decl.CSSMediaRule;
import com.helger.css.decl.CSSStyleRule;
import com.helger.css.decl.CascadingStyleSheet;
import com.helger.css.decl.ICSSExpressionMember;
import com.helger.css.decl.ICSSTopLevelRule;
import com.helger.css.reader.CSSReader;
import com.helger.css.reader.errorhandler.DoNothingCSSParseErrorHandler;
import com.helger.css.writer.CSSWriter;
import com.helger.css.writer.CSSWriterSettings;
import com.liferay.portal.kernel.util.HashMapBuilder;
import com.liferay.portal.kernel.util.StringUtil;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author David Truong
*/
public class CSSRTLConverter {
public CSSRTLConverter() {
this(true);
}
public CSSRTLConverter(boolean compress) {
_cssWriterSettings = new CSSWriterSettings(ECSSVersion.CSS30, compress);
_cssWriterSettings.setOptimizedOutput(compress);
_cssWriterSettings.setRemoveUnnecessaryCode(Boolean.TRUE);
_cssWriter = new CSSWriter(_cssWriterSettings);
_cssWriter.setWriteFooterText(false);
_cssWriter.setWriteHeaderText(false);
}
public String process(String css) {
CascadingStyleSheet cascadingStyleSheet = CSSReader.readFromString(
css, CCharset.CHARSET_UTF_8_OBJ, ECSSVersion.CSS30,
new DoNothingCSSParseErrorHandler());
_processRules(cascadingStyleSheet.getAllRules());
return _cssWriter.getCSSAsString(cascadingStyleSheet);
}
private void _convertBackgroundProperties(CSSDeclaration cssDeclaration) {
CSSExpression cssExpression = cssDeclaration.getExpression();
List icssExpressionMembers =
cssExpression.getAllMembers();
for (ICSSExpressionMember icssExpressionMember :
icssExpressionMembers) {
if (icssExpressionMember instanceof CSSExpressionMemberFunction) {
CSSExpressionMemberFunction cssExpressionMemberFunction =
(CSSExpressionMemberFunction)icssExpressionMember;
_reverseValue(cssExpressionMemberFunction.getExpression());
}
else if (icssExpressionMember instanceof
CSSExpressionMemberTermSimple) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple =
(CSSExpressionMemberTermSimple)icssExpressionMember;
cssExpressionMemberTermSimple.setValue(
_reverse(cssExpressionMemberTermSimple.getValue()));
}
else if (icssExpressionMember instanceof
CSSExpressionMemberTermURI) {
CSSExpressionMemberTermURI cssExpressionMemberTermURI =
(CSSExpressionMemberTermURI)icssExpressionMember;
String uri = cssExpressionMemberTermURI.getURIString();
int index = uri.lastIndexOf("/") + 1;
String fileName = _reverse(uri.substring(index));
cssExpressionMemberTermURI.setURIString(
uri.substring(0, index) + fileName);
}
}
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
if (cssExpressionMemberTermSimples.size() == 1) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple =
cssExpressionMemberTermSimples.get(0);
String value = cssExpressionMemberTermSimple.getValue();
Matcher matcher = _percentOrLengthPattern.matcher(value);
if (matcher.matches()) {
cssExpression.addTermSimple(value);
cssExpressionMemberTermSimple.setValue("right");
}
}
else if (cssExpressionMemberTermSimples.size() == 2) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple =
cssExpressionMemberTermSimples.get(0);
String value = cssExpressionMemberTermSimple.getValue();
Matcher matcher = _percentPattern.matcher(value);
if (matcher.matches()) {
int delta = Integer.valueOf(value.replaceAll("[^\\d]", ""), 10);
value = (100 - delta) + "%";
cssExpressionMemberTermSimple.setValue(value);
}
}
}
private void _convertShorthandProperties(CSSDeclaration cssDeclaration) {
CSSExpression cssExpression = cssDeclaration.getExpression();
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
if (cssExpressionMemberTermSimples.size() == 4) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple2 =
cssExpressionMemberTermSimples.get(1);
String value = cssExpressionMemberTermSimple2.getValue();
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple4 =
cssExpressionMemberTermSimples.get(3);
cssExpressionMemberTermSimple2.setValue(
cssExpressionMemberTermSimple4.getValue());
cssExpressionMemberTermSimple4.setValue(value);
}
}
private void _convertShorthandRadiusProperties(
CSSDeclaration cssDeclaration) {
CSSExpression cssExpression = cssDeclaration.getExpression();
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
if (cssExpressionMemberTermSimples.size() == 4) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple1 =
cssExpressionMemberTermSimples.get(0);
String value = cssExpressionMemberTermSimple1.getValue();
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple2 =
cssExpressionMemberTermSimples.get(1);
cssExpressionMemberTermSimple1.setValue(
cssExpressionMemberTermSimple2.getValue());
cssExpressionMemberTermSimple2.setValue(value);
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple3 =
cssExpressionMemberTermSimples.get(2);
value = cssExpressionMemberTermSimple3.getValue();
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple4 =
cssExpressionMemberTermSimples.get(3);
cssExpressionMemberTermSimple3.setValue(
cssExpressionMemberTermSimple4.getValue());
cssExpressionMemberTermSimple4.setValue(value);
}
else if (cssExpressionMemberTermSimples.size() == 3) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple1 =
cssExpressionMemberTermSimples.get(0);
String value = cssExpressionMemberTermSimple1.getValue();
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple2 =
cssExpressionMemberTermSimples.get(1);
cssExpressionMemberTermSimple1.setValue(
cssExpressionMemberTermSimple2.getValue());
cssExpressionMemberTermSimple2.setValue(value);
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple3 =
cssExpressionMemberTermSimples.get(2);
value = cssExpressionMemberTermSimple3.getValue();
cssExpressionMemberTermSimple3.setValue(
cssExpressionMemberTermSimple1.getValue());
cssExpression.addTermSimple(value);
}
}
private void _processRule(CSSStyleRule cssStyleRule) {
for (CSSDeclaration cssDeclaration :
cssStyleRule.getAllDeclarations()) {
String property = _stripAsterisk(cssDeclaration.getProperty());
if (_backgroundProperties.contains(property)) {
_resizeYui3BackgroundPosition(cssStyleRule, cssDeclaration);
_convertBackgroundProperties(cssDeclaration);
}
else if (_cursorProperties.contains(property)) {
_replaceYui3Cursors(cssStyleRule, cssDeclaration);
}
else if (_iconProperties.contains(property)) {
_replaceIcons(cssDeclaration);
}
else if (_reverseProperties.contains(property)) {
_resizeYui3Offset(cssStyleRule, cssDeclaration);
_reverseProperty(cssDeclaration);
}
else if (_reverseValueProperties.contains(property)) {
_reverseValue(cssDeclaration);
}
else if (_shorthandRadiusProperties.contains(property)) {
_convertShorthandRadiusProperties(cssDeclaration);
}
else if (_shorthandProperties.contains(property)) {
_convertShorthandProperties(cssDeclaration);
}
}
}
private void _processRules(List icssTopLevelRules) {
for (ICSSTopLevelRule icssTopLevelRule : icssTopLevelRules) {
if (icssTopLevelRule instanceof CSSMediaRule) {
CSSMediaRule cssMediaRule = (CSSMediaRule)icssTopLevelRule;
_processRules(cssMediaRule.getAllRules());
}
else if (icssTopLevelRule instanceof CSSStyleRule) {
_processRule((CSSStyleRule)icssTopLevelRule);
}
}
}
private void _replace(
CSSDeclaration cssDeclaration, Map replacementValues) {
CSSExpression cssExpression = cssDeclaration.getExpression();
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
for (CSSExpressionMemberTermSimple cssExpressionMemberTermSimple :
cssExpressionMemberTermSimples) {
String replacementValue = replacementValues.get(
cssExpressionMemberTermSimple.getValue());
if (replacementValue != null) {
cssExpressionMemberTermSimple.setValue(replacementValue);
}
}
}
private void _replaceIcons(CSSDeclaration cssDeclaration) {
_replace(cssDeclaration, _replacementIcons);
}
private void _replaceYui3Cursors(
CSSStyleRule cssStyleRule, CSSDeclaration cssDeclaration) {
String selector = cssStyleRule.getSelectorsAsCSSString(
_cssWriterSettings, 0);
if (selector.contains(_YUI3_RESIZE_HANDLE)) {
_replace(cssDeclaration, _yui3ReplacementCursors);
}
}
private void _resizeYui3BackgroundPosition(
CSSStyleRule cssStyleRule, CSSDeclaration cssDeclaration) {
String property = cssDeclaration.getProperty();
if (!property.equals("background-position")) {
return;
}
String selector = cssStyleRule.getSelectorsAsCSSString(
_cssWriterSettings, 0);
Matcher matcher = _yui3ResizeHandleInnerPattern.matcher(selector);
if (!matcher.find()) {
return;
}
CSSExpression cssExpression = cssDeclaration.getExpression();
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
if (selector.endsWith("bl")) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple1 =
cssExpressionMemberTermSimples.get(0);
cssExpressionMemberTermSimple1.setValue("-30px");
}
else if (selector.endsWith("br")) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple1 =
cssExpressionMemberTermSimples.get(0);
cssExpressionMemberTermSimple1.setValue("-75px");
}
else if (selector.endsWith("tl")) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple1 =
cssExpressionMemberTermSimples.get(0);
cssExpressionMemberTermSimple1.setValue("-58px");
}
else if (selector.endsWith("tr")) {
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple1 =
cssExpressionMemberTermSimples.get(0);
cssExpressionMemberTermSimple1.setValue("-47px");
}
CSSExpressionMemberTermSimple cssExpressionMemberTermSimple2 =
cssExpressionMemberTermSimples.get(1);
cssExpressionMemberTermSimple2.setValue("0");
}
private void _resizeYui3Offset(
CSSStyleRule cssStyleRule, CSSDeclaration cssDeclaration) {
String selector = cssStyleRule.getSelectorsAsCSSString(
_cssWriterSettings, 0);
Matcher matcher = _yui3ResizeHandleInnerPattern.matcher(selector);
if (!matcher.find()) {
return;
}
CSSExpression cssExpression = cssDeclaration.getExpression();
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
for (CSSExpressionMemberTermSimple cssExpressionMemberTermSimple :
cssExpressionMemberTermSimples) {
cssExpressionMemberTermSimple.setValue("2px");
}
}
private String _reverse(String s) {
if (s.contains("right")) {
return StringUtil.replace(s, "right", "left");
}
else if (s.contains("left")) {
return StringUtil.replace(s, "left", "right");
}
return s;
}
private void _reverseProperty(CSSDeclaration cssDeclaration) {
String property = cssDeclaration.getProperty();
String asterisk = "";
if (property.startsWith("*")) {
asterisk = "*";
property = _stripAsterisk(property);
}
property = _reverse(property);
cssDeclaration.setProperty(asterisk + property);
}
private void _reverseValue(CSSDeclaration cssDeclaration) {
_reverseValue(cssDeclaration.getExpression());
}
private void _reverseValue(CSSExpression cssExpression) {
List cssExpressionMemberTermSimples =
cssExpression.getAllSimpleMembers();
for (CSSExpressionMemberTermSimple cssExpressionMemberTermSimple :
cssExpressionMemberTermSimples) {
String value = cssExpressionMemberTermSimple.getValue();
value = _reverse(value);
if (value.contains("rtl")) {
value = StringUtil.replace(value, "rtl", "ltr");
}
else if (value.contains("ltr")) {
value = StringUtil.replace(value, "ltr", "rtl");
}
cssExpressionMemberTermSimple.setValue(value);
}
}
private String _stripAsterisk(String property) {
return property.replaceAll("\\**\\b", "");
}
private static final String _YUI3_RESIZE_HANDLE = ".yui3-resize-handle";
private static final List _backgroundProperties = Arrays.asList(
"background", "background-image", "background-position");
private static final List _cursorProperties = Arrays.asList(
"cursor");
private static final List _iconProperties = Arrays.asList(
"content");
private static final Pattern _percentOrLengthPattern = Pattern.compile(
"(\\d+)([a-z]{2}|%)");
private static final Pattern _percentPattern = Pattern.compile("\\d+%");
private static final Map _replacementIcons =
HashMapBuilder.put(
"\"\\f0a4\"", "\"\\f0a5\""
).put(
"\"\\f0a5\"", "\"\\f0a4\""
).put(
"\"\\f0a8\"", "\"\\f0a9\""
).put(
"\"\\f0a9\"", "\"\\f0a8\""
).put(
"\"\\f0d9\"", "\"\\f0da\""
).put(
"\"\\f0da\"", "\"\\f0d9\""
).put(
"\"\\f053\"", "\"\\f054\""
).put(
"\"\\f054\"", "\"\\f053\""
).put(
"\"\\f060\"", "\"\\f061\""
).put(
"\"\\f061\"", "\"\\f060\""
).put(
"\"\\f100\"", "\"\\f101\""
).put(
"\"\\f101\"", "\"\\f100\""
).put(
"\"\\f104\"", "\"\\f105\""
).put(
"\"\\f105\"", "\"\\f104\""
).put(
"\"\\f137\"", "\"\\f138\""
).put(
"\"\\f138\"", "\"\\f137\""
).put(
"\"\\f177\"", "\"\\f178\""
).put(
"\"\\f178\"", "\"\\f177\""
).build();
private static final List _reverseProperties = Arrays.asList(
"-moz-border-radius-bottomleft", "-moz-border-radius-bottomright",
"-moz-border-radius-topleft", "-moz-border-radius-topright",
"-webkit-border-bottom-left-radius",
"-webkit-border-bottom-right-radius", "-webkit-border-top-left-radius",
"-webkit-border-top-right-radius", "border-bottom-left-radius",
"border-bottom-right-radius", "border-left", "border-left-color",
"border-left-width", "border-radius-bottomleft",
"border-radius-bottomright", "border-radius-topleft",
"border-radius-topright", "border-right", "border-right-color",
"border-right-width", "border-top-left-radius",
"border-top-right-radius", "left", "margin-left", "margin-right",
"padding-left", "padding-right", "right");
private static final List _reverseValueProperties = Arrays.asList(
"clear", "direction", "float", "text-align");
private static final List _shorthandProperties = Arrays.asList(
"border-color", "border-style", "border-width", "margin", "padding");
private static final List _shorthandRadiusProperties =
Arrays.asList(
"-moz-border-radius", "-webkit-border-radius", "border-radius");
private static final Map _yui3ReplacementCursors =
HashMapBuilder.put(
"e-resize", "w-resize"
).put(
"ne-resize", "nw-resize"
).put(
"nw-resize", "ne-resize"
).put(
"se-resize", "sw-resize"
).put(
"sw-resize", "se-resize"
).put(
"w-resize", "e-resize"
).build();
private static final Pattern _yui3ResizeHandleInnerPattern =
Pattern.compile("\\.yui3-resize-handle-inner-(tr|tl|br|bl)");
private final CSSWriter _cssWriter;
private final CSSWriterSettings _cssWriterSettings;
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