org.apache.poi.ss.formula.functions.Roman Maven / Gradle / Ivy
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package org.apache.poi.ss.formula.functions;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
/**
* Implementation for Excel Roman() function.
*
* Syntax:
Roman (number,form)
*
* Converts an arabic numeral to roman, as text.
*
* Number Required. The Arabic numeral you want converted.
* Form Optional. A number specifying the type of roman numeral you want.
* The roman numeral style ranges from Classic to Simplified, becoming more concise as the value of form increases.
*
* Return_type a roman numeral, as text
*/
public class Roman extends Fixed2ArgFunction {
//M (1000), CM (900), D (500), CD (400), C (100), XC (90), L (50), XL (40), X (10), IX (9), V (5), IV (4) and I (1).
private static final int[] VALUES = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
private static final String[] ROMAN = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
private static final String[][] REPLACEMENTS = {
{ // form > 0
"XLV", "VL", // 45
"XCV", "VC", // 95
"CDL", "LD", // 450
"CML", "LM", // 950
"CMVC", "LMVL" // 995
},{ // Form == 1 only
"CDXC", "LDXL", // 490
"CDVC", "LDVL", // 495
"CMXC", "LMXL", // 990
"XCIX", "VCIV", // 99
"XLIX", "VLIV" // 49
},{ // form > 1
"XLIX", "IL", // 49
"XCIX", "IC", // 99
"CDXC", "XD", // 490
"CDVC", "XDV", // 495
"CDIC", "XDIX", // 499
"LMVL", "XMV", // 995
"CMIC", "XMIX", // 999
"CMXC", "XM" // 990
},{ // form > 2
"XDV", "VD", // 495
"XDIX", "VDIV", // 499
"XMV", "VM", // 995
"XMIX", "VMIV" // 999
},{ // form == 4
"VDIV", "ID", // 499
"VMIV", "IM" // 999
}
};
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval numberVE, ValueEval formVE) {
final int number;
try {
ValueEval ve = OperandResolver.getSingleValue(numberVE, srcRowIndex, srcColumnIndex);
number = OperandResolver.coerceValueToInt(ve);
} catch (EvaluationException e) {
return ErrorEval.VALUE_INVALID;
}
if (number < 0) {
return ErrorEval.VALUE_INVALID;
}
if (number > 3999) {
return ErrorEval.VALUE_INVALID;
}
if (number == 0) {
return new StringEval("");
}
final int form;
try {
ValueEval ve = OperandResolver.getSingleValue(formVE, srcRowIndex, srcColumnIndex);
form = OperandResolver.coerceValueToInt(ve);
} catch (EvaluationException e) {
return ErrorEval.NUM_ERROR;
}
if (form > 4 || form < 0) {
return ErrorEval.VALUE_INVALID;
}
String result = this.integerToRoman(number);
if (form == 0) {
return new StringEval(result);
}
return new StringEval(makeConcise(result, form));
}
/**
* Classic conversion.
*
* @param number the number
*/
private String integerToRoman(int number) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < 13; i++) {
while (number >= VALUES[i]) {
number -= VALUES[i];
result.append(ROMAN[i]);
}
}
return result.toString();
}
/**
* Use conversion rule to factor some parts and make them more concise
*
* @param input the input string
* @param form the level of conciseness [0..4] with 4 being most concise and simplified
*/
public String makeConcise(final String input, final int form) {
String result = input;
for (int i=0; i<=form && i<=4 && form > 0; i++) {
if (i==1 && form>1) {
// Replacement[1] is only meant for form == 1
continue;
}
String[] repl = REPLACEMENTS[i];
for (int j=0; j