com.google.common.css.compiler.passes.CollectProvideNamespaces Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of closure-stylesheets Show documentation

Closure Stylesheets is an extension to CSS that adds variables, functions, conditionals, and mixins to standard CSS. The tool also supports minification, linting, RTL flipping, and CSS class renaming.

There is a newer version: 1.8.0

Show newest version

/*
 * Copyright 2013 Google Inc.
 *
 * 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.google.common.css.compiler.passes;

import com.google.common.base.Preconditions;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Maps;
import com.google.common.css.compiler.ast.*;

import java.util.Map;

/**
 * A compiler pass to help find missing {@code @require} lines for def constant references
 * and mixins.
 * This pass simply collects namespaces that correpond to constant definitions and mixins.
 * Also see the CheckMissingRequire pass that is used in conjunction with this one.
 * 
 * NOTE: The maps in this class can only be used within the same set of pass runs.
 */
public final class CollectProvideNamespaces extends DefaultTreeVisitor implements CssCompilerPass {
    private final VisitController visitController;

    // Key: filename; Value: provide namespace
    private final Map filenameProvideMap = Maps.newHashMap();
    // Key: filename; Value: require namespace
    private final ListMultimap filenameRequireMap = LinkedListMultimap.create();

    // Multiple namespaces can contain the same defs due to duplicate defs (or mods).
    // Key: def name; Value: provide namespace
    private final ListMultimap defProvideMap = LinkedListMultimap.create();
    // Key: defmixin name; Value: provide namespace
    private final ListMultimap defmixinProvideMap = LinkedListMultimap.create();

    public Map getFilenameProvideMap() {
        return filenameProvideMap;
    }

    public ListMultimap getFilenameRequireMap() {
        return filenameRequireMap;
    }

    public ListMultimap getDefProvideMap() {
        return defProvideMap;
    }

    public ListMultimap getDefmixinProvideMap() {
        return defmixinProvideMap;
    }

    public CollectProvideNamespaces(VisitController visitController) {
        this.visitController = visitController;
    }

    @Override
    public boolean enterProvideNode(CssProvideNode node) {
        Preconditions.checkState(node.getSourceCodeLocation() != null);
        String filename = node.getSourceCodeLocation().getSourceCode().getFileName();
        filenameProvideMap.put(filename, node.getProvide());
        return true;
    }

    @Override
    public boolean enterRequireNode(CssRequireNode node) {
        Preconditions.checkState(node.getSourceCodeLocation() != null);
        String filename = node.getSourceCodeLocation().getSourceCode().getFileName();
        filenameRequireMap.put(filename, node.getRequire());
        return true;
    }

    @Override
    public boolean enterDefinition(CssDefinitionNode node) {
        if (node.getSourceCodeLocation() == null) {
            // Cannot enforce provide / require for generated GSS components.
            return true;
        }
        String filename = node.getSourceCodeLocation().getSourceCode().getFileName();
        String provideNamespace = filenameProvideMap.get(filename);
        defProvideMap.put(node.getName().getValue(), provideNamespace);
        return true;
    }

    @Override
    public boolean enterMixinDefinition(CssMixinDefinitionNode node) {
        if (node.getSourceCodeLocation() == null) {
            // Cannot enforce provide / require for generated GSS components.
            return true;
        }
        String filename = node.getSourceCodeLocation().getSourceCode().getFileName();
        String provideNamespace = filenameProvideMap.get(filename);
        Preconditions.checkArgument(provideNamespace != null);
        defmixinProvideMap.put(node.getDefinitionName(), provideNamespace);
        return true;
    }

    @Override
    public void runPass() {
        filenameProvideMap.clear();
        filenameRequireMap.clear();
        defProvideMap.clear();
        defmixinProvideMap.clear();
        visitController.startVisit(this);
    }
}