com.vaadin.sass.internal.parser.function.MinMaxFunctionGenerator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of vaadin-sass-compiler Show documentation

A pure Java implementation of the http://sass-lang.com compiler

There is a newer version: 0.9.13

/*
 * Copyright 2000-2014 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.parser.function;

import com.vaadin.sass.internal.parser.ActualArgumentList;
import com.vaadin.sass.internal.parser.LexicalUnitImpl;
import com.vaadin.sass.internal.parser.ParseException;
import com.vaadin.sass.internal.parser.SassListItem;

public class MinMaxFunctionGenerator extends AbstractFunctionGenerator {

    public MinMaxFunctionGenerator() {
        super("min", "max");
    }

    @Override
    public SassListItem compute(LexicalUnitImpl function) {
        ActualArgumentList params = function.getParameterList();
        if (params.size() == 0) {
            throw new ParseException("The function "
                    + function.getFunctionName()
                    + " requires at least one parameter", function);
        }
        // keep the unit of the result like sass-lang does
        LexicalUnitImpl result = getParam(function, params.get(0));
        for (int i = 1; i < params.size(); ++i) {
            LexicalUnitImpl value = getParam(function, params.get(i));
            if ("min".equals(function.getFunctionName())) {
                if (value.getFloatValue() < result.getFloatValue()) {
                    result = value;
                }
            } else {
                if (value.getFloatValue() > result.getFloatValue()) {
                    result = value;
                }
            }
        }
        return result;
    }

    private LexicalUnitImpl getParam(LexicalUnitImpl function,
            SassListItem param) {
        if (!(param instanceof LexicalUnitImpl)
                || !((LexicalUnitImpl) param).isNumber()) {
            throw new ParseException("The parameters to the function "
                    + function.getFunctionName() + " must be numerical", param);
        }
        return (LexicalUnitImpl) param;
    }
}