com.google.template.soy.soytree.RequirecssUtils.java Source code

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Here is the source code for com.google.template.soy.soytree.RequirecssUtils.java

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/*
 * 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.template.soy.soytree;

import com.google.common.collect.ImmutableList;
import com.google.template.soy.base.SoySyntaxException;
import com.google.template.soy.base.internal.BaseUtils;

import javax.annotation.Nullable;

/**
 * Utilities for processing the 'requirecss' attribute (for a Soy file or for a template).
 *
 * <p>Important: Do not use outside of Soy code (treat as superpackage-private).
 *
 */
public class RequirecssUtils {

    // Disallow instantiation.
    private RequirecssUtils() {
    }

    /**
     * Parses a 'requirecss' attribute value (for a Soy file or a template).
     *
     * @param requirecssAttr The 'requirecss' attribute value to parse.
     * @return A list of required CSS namespaces parsed from the given attribute value.
     */
    public static ImmutableList<String> parseRequirecssAttr(@Nullable String requirecssAttr) {

        if (requirecssAttr == null) {
            return ImmutableList.of();
        }

        String[] namespaces = requirecssAttr.trim().split("\\s*,\\s*");
        for (String namespace : namespaces) {
            if (!BaseUtils.isDottedIdentifier(namespace)) {
                throw SoySyntaxException
                        .createWithoutMetaInfo("Invalid required CSS namespace name \"" + namespace + "\".");
            }
        }
        return ImmutableList.copyOf(namespaces);
    }

}