com.google.gwt.resources.gss.ValueFunction.java Source code

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Here is the source code for com.google.gwt.resources.gss.ValueFunction.java

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/*
 * Copyright 2013 Julien Dramaix.
 *
 * 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.gwt.resources.gss;

import com.google.common.collect.ImmutableList;
import com.google.common.css.compiler.ast.CssValueNode;
import com.google.common.css.compiler.ast.ErrorManager;
import com.google.common.css.compiler.ast.GssFunction;
import com.google.common.css.compiler.ast.GssFunctionException;
import com.google.gwt.resources.gss.ast.CssDotPathNode;

import java.util.List;

public class ValueFunction implements GssFunction {
    public static String getName() {
        return "value";
    }

    @Override
    public List<CssValueNode> getCallResultNodes(List<CssValueNode> args, ErrorManager errorManager)
            throws GssFunctionException {
        if (args.size() == 0 || args.size() > 3) {
            throw new GssFunctionException(getName() + " function take one, two or three arguments");
        }

        String functionPath = args.get(0).getValue();
        String prefix = null;
        String suffix = null;

        if (args.size() > 1) {
            suffix = args.get(1).getValue();
        }

        if (args.size() > 2) {
            prefix = args.get(2).getValue();
        }

        CssDotPathNode cssDotPathNode = new CssDotPathNode(functionPath, prefix, suffix,
                args.get(0).getSourceCodeLocation());

        // TODO add validation : maybe add a compilation pass that will validate the the method exist
        // on the resource bundle

        return ImmutableList.of((CssValueNode) cssDotPathNode);
    }

    @Override
    public String getCallResultString(List<String> args) throws GssFunctionException {

        String functionPath = args.get(0);
        String prefix = null;
        String suffix = null;

        if (args.size() > 1) {
            suffix = args.get(1);
        }

        if (args.size() > 2) {
            prefix = args.get(2);
        }

        return CssDotPathNode.resolveExpression(null, functionPath, prefix, suffix);
    }

    @Override
    public Integer getNumExpectedArguments() {
        // number of arguments is variable
        return null;
    }
}