BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/SS/Formula/FormulaRenderer.cs

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/* ====================================================================
   Licensed To the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for Additional information regarding copyright ownership.
   The ASF licenses this file To You 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.
==================================================================== */

namespace Zephyr.Utils.NPOI.SS.Formula
{

    using System;
    using System.Text;
    using System.Collections;

    using Zephyr.Utils.NPOI.SS.Formula;
    using Zephyr.Utils.NPOI.SS.Formula.PTG;

    /**
     * Common logic for rendering formulas.<br/>
     * 
     * For POI internal use only
     * 
     * @author Josh Micich
     */
    public class FormulaRenderer
    {

        /**
         * Static method To convert an array of {@link Ptg}s in RPN order
         * To a human readable string format in infix mode.
         * @param book  used for defined names and 3D references
         * @param ptgs  must not be <c>null</c>
         * @return a human readable String
         */
        public static String ToFormulaString(IFormulaRenderingWorkbook book, Ptg[] ptgs)
        {
            if (ptgs == null || ptgs.Length == 0)
            {
                throw new ArgumentException("ptgs must not be null");
            }
            Stack stack = new Stack();

            for (int i = 0; i < ptgs.Length; i++)
            {
                Ptg ptg = ptgs[i];
                // TODO - what about MemNoMemPtg?
                if (ptg is MemAreaPtg || ptg is MemFuncPtg || ptg is MemErrPtg)
                {
                    // marks the start of a list of area expressions which will be naturally combined
                    // by their trailing operators (e.g. UnionPtg)