/*
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* Licensed to the Apache Software Foundation (ASF) Under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for Additional information regarding copyright ownership.
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* The ASF licenses this file to You Under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed Under the License is distributed on an "AS Is" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations Under the License.
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*/
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/*
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* Created on May 15, 2005
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*
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*/
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namespace HH.WMS.Utils.NPOI.SS.Formula.Functions
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{
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using System;
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using System.Text;
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using HH.WMS.Utils.NPOI.SS.Formula.Eval;
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/**
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* An implementation of the SUBSTITUTE function:
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* Substitutes text in a text string with new text, some number of times.
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* @author Manda Wilson < wilson at c bio dot msk cc dot org >
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*/
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public class Substitute : TextFunction
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{
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// fix warning CS0414 "never used": private static int Replace_ALL = -1;
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/**
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*Substitutes text in a text string with new text, some number of times.
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*
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* @see org.apache.poi.hssf.record.formula.eval.Eval
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*/
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public override ValueEval EvaluateFunc(ValueEval[] args, int srcCellRow, int srcCellCol)
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{
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if (args.Length < 3 || args.Length > 4)
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{
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return ErrorEval.VALUE_INVALID;
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}
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String oldStr = EvaluateStringArg(args[0], srcCellRow, srcCellCol);
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String searchStr = EvaluateStringArg(args[1], srcCellRow, srcCellCol);
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String newStr = EvaluateStringArg(args[2], srcCellRow, srcCellCol);
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String result;
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switch (args.Length)
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{
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case 4:
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int instanceNumber = EvaluateIntArg(args[3], srcCellRow, srcCellCol);
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if (instanceNumber < 1)
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{
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return ErrorEval.VALUE_INVALID;
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}
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result = ReplaceOneOccurrence(oldStr, searchStr, newStr, instanceNumber);
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break;
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case 3:
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result = ReplaceAllOccurrences(oldStr, searchStr, newStr);
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break;
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default:
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throw new InvalidOperationException("Cannot happen");
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}
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return new StringEval(result);
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}
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private static String ReplaceAllOccurrences(String oldStr, String searchStr, String newStr)
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{
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StringBuilder sb = new StringBuilder();
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int startIndex = 0;
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int nextMatch = -1;
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while (true)
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{
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nextMatch = oldStr.IndexOf(searchStr, startIndex, StringComparison.CurrentCulture);
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if (nextMatch < 0)
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{
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// store everything from end of last match to end of string
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sb.Append(oldStr.Substring(startIndex));
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return sb.ToString();
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}
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// store everything from end of last match to start of this match
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sb.Append(oldStr.Substring(startIndex, nextMatch));
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sb.Append(newStr);
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startIndex = nextMatch + searchStr.Length;
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}
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}
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private static String ReplaceOneOccurrence(String oldStr, String searchStr, String newStr, int instanceNumber)
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{
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if (searchStr.Length < 1)
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{
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return oldStr;
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}
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int startIndex = 0;
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int nextMatch = -1;
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int count = 0;
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while (true)
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{
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nextMatch = oldStr.IndexOf(searchStr, startIndex, StringComparison.CurrentCulture);
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if (nextMatch < 0)
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{
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// not enough occurrences found - leave unchanged
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return oldStr;
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}
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count++;
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if (count == instanceNumber)
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{
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StringBuilder sb = new StringBuilder(oldStr.Length + newStr.Length);
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sb.Append(oldStr.Substring(0, nextMatch));
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sb.Append(newStr);
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sb.Append(oldStr.Substring(nextMatch + searchStr.Length));
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return sb.ToString();
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}
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startIndex = nextMatch + searchStr.Length;
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}
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}
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}
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}
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