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/*
* Copyright 2011 Vaadin Ltd.
*
* 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.vaadin.sass;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.w3c.css.sac.CSSException;
import org.w3c.css.sac.InputSource;
import com.vaadin.sass.handler.SCSSDocumentHandler;
import com.vaadin.sass.handler.SCSSDocumentHandlerImpl;
import com.vaadin.sass.handler.SCSSErrorHandler;
import com.vaadin.sass.parser.Parser;
import com.vaadin.sass.resolver.ScssStylesheetResolver;
import com.vaadin.sass.resolver.VaadinResolver;
import com.vaadin.sass.tree.Node;
import com.vaadin.sass.tree.VariableNode;
import com.vaadin.sass.visitor.BlockVisitor;
import com.vaadin.sass.visitor.EachVisitor;
import com.vaadin.sass.visitor.ExtendVisitor;
import com.vaadin.sass.visitor.IfElseVisitor;
import com.vaadin.sass.visitor.ImportVisitor;
import com.vaadin.sass.visitor.ListModifyVisitor;
import com.vaadin.sass.visitor.MixinVisitor;
import com.vaadin.sass.visitor.NestPropertiesVisitor;
import com.vaadin.sass.visitor.ParentSelectorVisitor;
import com.vaadin.sass.visitor.VariableVisitor;
import com.vaadin.sass.visitor.Visitor;
public class ScssStylesheet extends Node {
private static final long serialVersionUID = 3849790204404961608L;
/**
* Read in a file SCSS and parse it into a ScssStylesheet
*
* @param file
* @throws IOException
*/
public ScssStylesheet() {
super();
}
/**
* Main entry point for the SASS compiler. Takes in a file and builds upp a
* ScssStylesheet tree out of it. Calling compile() on it will transform
* SASS into CSS. Calling toString() will print out the SCSS/CSS.
*
* @param file
* @return
* @throws CSSException
* @throws IOException
*/
public static ScssStylesheet get(String identifier) throws CSSException,
IOException {
File file = new File(identifier);
file = file.getCanonicalFile();
SCSSDocumentHandler handler = new SCSSDocumentHandlerImpl();
ScssStylesheet stylesheet = handler.getStyleSheet();
InputSource source = stylesheet.resolveStylesheet(identifier);
if (source == null) {
return null;
}
Parser parser = new Parser();
parser.setErrorHandler(new SCSSErrorHandler());
parser.setDocumentHandler(handler);
parser.parseStyleSheet(source);
return stylesheet;
}
private static ScssStylesheetResolver[] resolvers = null;
public static void setStylesheetResolvers(
ScssStylesheetResolver... styleSheetResolvers) {
resolvers = Arrays.copyOf(styleSheetResolvers,
styleSheetResolvers.length);
}
public InputSource resolveStylesheet(String identifier) {
if (resolvers == null) {
setStylesheetResolvers(new VaadinResolver());
}
for (ScssStylesheetResolver resolver : resolvers) {
InputSource source = resolver.resolve(identifier);
if (source != null) {
File f = new File(source.getURI());
setFileName(f.getParent());
return source;
}
}
return null;
}
/**
* Applies all the visitors and compiles SCSS into Css.
*
* @throws Exception
*/
public void compile() throws Exception {
List<Visitor> visitors = new ArrayList<Visitor>();
visitors.add(new ImportVisitor());
visitors.add(new VariableVisitor());
visitors.add(new MixinVisitor());
visitors.add(new IfElseVisitor());
visitors.add(new ParentSelectorVisitor());
visitors.add(new BlockVisitor());
visitors.add(new NestPropertiesVisitor());
visitors.add(new ExtendVisitor());
visitors.add(new EachVisitor());
visitors.add(new ListModifyVisitor());
for (Visitor visitor : visitors) {
visitor.traverse(this);
}
}
/**
* Prints out the current state of the node tree. Will return SCSS before
* compile and CSS after.
*
* For now this is an own method with it's own implementation that most node
* types will implement themselves.
*/
@Override
public String toString() {
StringBuilder string = new StringBuilder("");
if (children.size() > 0) {
string.append(children.get(0).toString());
}
String delimeter = "\n\n";
if (children.size() > 1) {
for (int i = 1; i < children.size(); i++) {
String childString = children.get(i).toString();
if (childString != null) {
string.append(delimeter).append(childString);
}
}
}
String output = string.toString();
return output;
}
public void addChild(int index, VariableNode node) {
if (node != null) {
children.add(index, node);
}
}
}
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