/*******************************************************************************
 * Copyright 2017 Bstek
 *
 * 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.bstek.ureport.expression.parse.builder;

import com.bstek.ureport.dsl.ReportParserParser.FunctionContext;
import com.bstek.ureport.dsl.ReportParserParser.FunctionParameterContext;
import com.bstek.ureport.dsl.ReportParserParser.ItemContext;
import com.bstek.ureport.dsl.ReportParserParser.UnitContext;
import com.bstek.ureport.expression.ExpressionUtils;
import com.bstek.ureport.expression.model.expr.BaseExpression;
import com.bstek.ureport.expression.model.expr.FunctionExpression;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Jacky.gao
 * @since 2016年12月26日
 */
public class FunctionExpressionBuilder extends BaseExpressionBuilder {
    @Override
    public BaseExpression build(UnitContext unitContext) {
        FunctionContext ctx = unitContext.function();
        FunctionExpression expr = new FunctionExpression();
        expr.setExpr(ctx.getText());
        expr.setName(ctx.Identifier().getText());
        FunctionParameterContext functionParameterContext = ctx.functionParameter();
        if (functionParameterContext != null) {
            List<BaseExpression> exprList = new ArrayList<>();
            List<ItemContext> itemContexts = functionParameterContext.item();
            if (itemContexts != null) {
                for (ItemContext itemContext : itemContexts) {
                    BaseExpression baseExpr = ExpressionUtils.getExprVisitor().parseItemContext(itemContext);
                    exprList.add(baseExpr);
                }
            }
            expr.setExpressions(exprList);
        }
        return expr;
    }

    @Override
    public boolean support(UnitContext unitContext) {
        return unitContext.function() != null;
    }
}
