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/*
* Copyright 2000-2013 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.internal.resolver;
import java.io.File;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import org.w3c.css.sac.InputSource;
import com.vaadin.sass.internal.ScssStylesheet;
/**
* Base class for resolvers. Implements functionality for locating paths which
* an import can be relative to and helpers for extracting path information from
* the identifier.
*
* @since 7.2
* @author Vaadin Ltd
*/
public abstract class AbstractResolver implements ScssStylesheetResolver,
Serializable {
/*
* (non-Javadoc)
*
* @see
* com.vaadin.sass.internal.resolver.ScssStylesheetResolver#resolve(java
* .lang.String)
*/
@Override
public InputSource resolve(ScssStylesheet parentStylesheet,
String identifier) {
// Remove a possible ".scss" suffix
identifier = identifier.replaceFirst(".scss$", "");
List<String> potentialParentPaths = getPotentialParentPaths(
parentStylesheet, identifier);
// remove path from identifier as it has already been added to the
// parent path
if (identifier.contains("/")) {
identifier = identifier.substring(identifier.lastIndexOf("/") + 1);
}
for (String path : potentialParentPaths) {
InputSource source = normalizeAndResolve(path + "/" + identifier);
if (source != null) {
return source;
}
// Try to find partial import (_identifier.scss)
source = normalizeAndResolve(path + "/_" + identifier);
if (source != null) {
return source;
}
}
return normalizeAndResolve(identifier);
}
/**
* Retrieves the parent paths which should be used while resolving relative
* identifiers. By default uses the parent stylesheet location and a
* possible absolute path in the identifier.
*
* @param parentStylesheet
* The parent stylesheet or null if there is no parent
* @param identifier
* The identifier to be resolved
* @return a list of paths in which to look for the relative import
*/
protected List<String> getPotentialParentPaths(
ScssStylesheet parentStylesheet, String identifier) {
List<String> potentialParents = new ArrayList<String>();
if (parentStylesheet != null) {
potentialParents.add(extractFullPath(
parentStylesheet.getDirectory(), identifier));
}
// Identifier can be a full path so extract the path part also as a
// potential parent
if (identifier.contains("/")) {
potentialParents.add(extractFullPath("", identifier));
}
return potentialParents;
}
/**
* Extracts the full path from the path combined with the identifier
*
* @param path
* The base path
* @param identifier
* The identifier which may contain a path part, separated by "/"
* from the real identifier
* @return a normalized version of the path where identifier does not
* contain any directory information
*/
protected String extractFullPath(String path, String identifier) {
int lastSlashPosition = identifier.lastIndexOf("/");
if (lastSlashPosition == -1) {
return path;
}
String identifierPath = identifier.substring(0, lastSlashPosition);
if ("".equals(path)) {
return identifierPath;
} else {
return path + "/" + identifierPath;
}
}
/**
* Resolves the normalized version of the given identifier
*
* @param identifier
* The identifier to resolve
* @return An input source if the resolver found one or null otherwise
*/
protected InputSource normalizeAndResolve(String identifier) {
String normalized = normalize(identifier);
return resolveNormalized(normalized);
}
/**
* Resolves the identifier after it has been normalized using
* {@link #normalize(String)}.
*
* @param identifier
* The normalized identifier
* @return an InputSource if the resolver found a source or null otherwise
*/
protected abstract InputSource resolveNormalized(String identifier);
/**
* Normalizes "." and ".." from the path string where parent path segments
* can be removed. Preserve leading "..". Also ensure / is used instead of \
* in all places.
*
* @param path
* A relative or absolute file path
* @return The normalized path
*/
protected String normalize(String path) {
// Ensure only "/" is used, also in Windows
path = path.replace(File.separatorChar, '/');
// Split into segments
String[] segments = path.split("/");
Stack<String> result = new Stack<String>();
// Replace '.' and '..' segments
for (int i = 0; i < segments.length; i++) {
if (segments[i].equals(".")) {
// Segments marked '.' are ignored
} else if (segments[i].equals("..") && !result.isEmpty()
&& !result.lastElement().equals("..")) {
// If segment is ".." then remove the previous iff the previous
// element is not a ".." and the result stack is not empty
result.pop();
} else {
// Other segments are just added to the stack
result.push(segments[i]);
}
}
// Reconstruct path
StringBuilder pathBuilder = new StringBuilder();
for (int i = 0; i < result.size(); i++) {
if (i > 0) {
pathBuilder.append("/");
}
pathBuilder.append(result.get(i));
}
return pathBuilder.toString();
}
}
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