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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.*;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Implementation for Excel IMAGINARY() function.

*

* Syntax:
IMAGINARY (Inumber)
*

* Returns the imaginary coefficient of a complex number in x + yi or x + yj text format. *

* Inumber is a complex number for which you want the imaginary coefficient. *

* Remarks *

    *
  • Use COMPLEX to convert real and imaginary coefficients into a complex number.
  • *
* * @author cedric dot walter @ gmail dot com */ public class Imaginary extends Fixed1ArgFunction implements FreeRefFunction { public static final FreeRefFunction instance = new Imaginary(); public static final String GROUP1_REAL_SIGN_REGEX = "([+-]?)"; public static final String GROUP2_REAL_INTEGER_OR_DOUBLE_REGEX = "([0-9]+\\.[0-9]+|[0-9]*)"; public static final String GROUP3_IMAGINARY_SIGN_REGEX = "([+-]?)"; public static final String GROUP4_IMAGINARY_INTEGER_OR_DOUBLE_REGEX = "([0-9]+\\.[0-9]+|[0-9]*)"; public static final String GROUP5_IMAGINARY_GROUP_REGEX = "([ij]?)"; public static final Pattern COMPLEX_NUMBER_PATTERN = Pattern.compile(GROUP1_REAL_SIGN_REGEX + GROUP2_REAL_INTEGER_OR_DOUBLE_REGEX + GROUP3_IMAGINARY_SIGN_REGEX + GROUP4_IMAGINARY_INTEGER_OR_DOUBLE_REGEX + GROUP5_IMAGINARY_GROUP_REGEX); public static final int GROUP1_REAL_SIGN = 1; public static final int GROUP2_IMAGINARY_INTEGER_OR_DOUBLE = 2; public static final int GROUP3_IMAGINARY_SIGN = 3; public static final int GROUP4_IMAGINARY_INTEGER_OR_DOUBLE = 4; public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval inumberVE) { ValueEval veText1; try { veText1 = OperandResolver.getSingleValue(inumberVE, srcRowIndex, srcColumnIndex); } catch (EvaluationException e) { return e.getErrorEval(); } String iNumber = OperandResolver.coerceValueToString(veText1); Matcher m = COMPLEX_NUMBER_PATTERN.matcher(iNumber); boolean result = m.matches(); String imaginary = ""; if (result) { String imaginaryGroup = m.group(5); boolean hasImaginaryPart = imaginaryGroup.equals("i") || imaginaryGroup.equals("j"); if (imaginaryGroup.length() == 0) { return new StringEval(String.valueOf(0)); } if (hasImaginaryPart) { String sign = ""; String imaginarySign = m.group(GROUP3_IMAGINARY_SIGN); if (imaginarySign.length() != 0 && !(imaginarySign.equals("+"))) { sign = imaginarySign; } String groupImaginaryNumber = m.group(GROUP4_IMAGINARY_INTEGER_OR_DOUBLE); if (groupImaginaryNumber.length() != 0) { imaginary = sign + groupImaginaryNumber; } else { imaginary = sign + "1"; } } } else { return ErrorEval.NUM_ERROR; } return new StringEval(imaginary); } public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { if (args.length != 1) { return ErrorEval.VALUE_INVALID; } return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0]); } }




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