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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.visitor;
import java.util.ArrayList;
import com.vaadin.sass.internal.ScssStylesheet;
import com.vaadin.sass.internal.parser.LexicalUnitImpl;
import com.vaadin.sass.internal.tree.IVariableNode;
import com.vaadin.sass.internal.tree.MixinDefNode;
import com.vaadin.sass.internal.tree.MixinNode;
import com.vaadin.sass.internal.tree.Node;
import com.vaadin.sass.internal.tree.VariableNode;
import com.vaadin.sass.internal.util.DeepCopy;
public class MixinNodeHandler {
public static void traverse(MixinNode node) throws Exception {
replaceMixins(node);
}
private static void replaceMixins(MixinNode node) throws Exception {
MixinDefNode mixinDef = ScssStylesheet.getMixinDefinition(node
.getName());
if (mixinDef == null) {
throw new Exception("Mixin Definition: " + node.getName()
+ " not found");
}
replaceMixinNode(node, mixinDef);
}
private static void replaceMixinNode(MixinNode mixinNode,
MixinDefNode mixinDef) {
Node pre = mixinNode;
MixinDefNode defClone = (MixinDefNode) DeepCopy.copy(mixinDef);
defClone.traverse();
if (mixinDef.getArglist().isEmpty()) {
for (Node child : new ArrayList<Node>(defClone.getChildren())) {
mixinNode.getParentNode().appendChild(child, pre);
pre = child;
}
} else {
replacePossibleArguments(mixinNode, defClone);
Node previous = mixinNode;
for (final Node child : new ArrayList<Node>(defClone.getChildren())) {
replaceChildVariables(defClone, child);
mixinNode.getParentNode().appendChild(child, previous);
previous = child;
}
}
mixinNode.getParentNode().removeChild(mixinNode);
}
/**
* We have to replace all the mixin parameters. This is done in two phases.
* First phase replaces all the named parameters while the second replaces
* in order of remaining unmodified parameters.
*
* @param mixinNode
* @param def
*/
private static void replacePossibleArguments(MixinNode mixinNode,
MixinDefNode def) {
if (mixinNode.getArglist().size() > 0) {
ArrayList<VariableNode> remainingNodes = new ArrayList<VariableNode>(
def.getArglist());
ArrayList<LexicalUnitImpl> remainingUnits = new ArrayList<LexicalUnitImpl>(
mixinNode.getArglist());
for (final LexicalUnitImpl unit : mixinNode.getArglist()) {
if (unit.getLexicalUnitType() == LexicalUnitImpl.SCSS_VARIABLE
&& unit.getNextLexicalUnit() != null) {
for (final VariableNode node : def.getArglist()) {
if (node.getName().equals(unit.getValue().toString())) {
node.setExpr((LexicalUnitImpl) DeepCopy.copy(unit
.getNextLexicalUnit()));
remainingNodes.remove(node);
remainingUnits.remove(unit);
break;
}
}
}
}
checkExtraParameters(mixinNode, remainingNodes.size(),
remainingUnits.size());
for (int i = 0; i < remainingNodes.size()
&& i < remainingUnits.size(); i++) {
LexicalUnitImpl unit = remainingUnits.get(i);
remainingNodes.get(i).setExpr(
(LexicalUnitImpl) DeepCopy.copy(unit));
}
}
}
protected static void checkExtraParameters(MixinNode mixinNode,
int remainingNodesSize, int remainingUnitsSize) {
if (remainingUnitsSize > remainingNodesSize) {
String fileName = null;
Node root = mixinNode.getParentNode();
while (root != null && !(root instanceof ScssStylesheet)) {
root = root.getParentNode();
}
if (root != null) {
fileName = ((ScssStylesheet) root).getFileName();
}
StringBuilder builder = new StringBuilder();
builder.append("More parameters than expected, in Mixin ").append(
mixinNode.getName());
if (fileName != null) {
builder.append(", in file ").append(fileName);
}
throw new RuntimeException(builder.toString());
}
}
private static void replaceChildVariables(MixinDefNode mixinDef, Node node) {
for (final Node child : node.getChildren()) {
replaceChildVariables(mixinDef, child);
}
if (node instanceof IVariableNode) {
((IVariableNode) node).replaceVariables(mixinDef.getArglist());
}
}
}
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