trunk/src/testcases/org/apache/poi/ss/formula/function/TestParseMissingBuiltInFuncs.java

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package org.apache.poi.ss.formula.function;

import static org.junit.Assert.assertEquals;

import java.io.IOException;

import org.apache.poi.hssf.model.HSSFFormulaParser;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.formula.ptg.AbstractFunctionPtg;
import org.apache.poi.ss.formula.ptg.FuncPtg;
import org.apache.poi.ss.formula.ptg.FuncVarPtg;
import org.apache.poi.ss.formula.ptg.Ptg;
import org.junit.Test;

import junit.framework.AssertionFailedError;
/**
 * Tests parsing of some built-in functions that were not properly
 * registered in POI as of bug #44675, #44733 (March/April 2008).
 */
public final class TestParseMissingBuiltInFuncs {

	private static Ptg[] parse(String formula) throws IOException {
		HSSFWorkbook book = new HSSFWorkbook();
		Ptg[] ptgs = HSSFFormulaParser.parse(formula, book);
		book.close();
		return ptgs;
	}
	
	private static void confirmFunc(String formula, int expPtgArraySize, boolean isVarArgFunc, int funcIx)
	throws IOException {
		Ptg[] ptgs = parse(formula);
		Ptg ptgF = ptgs[ptgs.length-1];  // func is last RPN token in all these formulas
		
		// Check critical things in the Ptg array encoding.
		if(!(ptgF instanceof AbstractFunctionPtg)) {
		    throw new RuntimeException("function token missing");
		}
		AbstractFunctionPtg func = (AbstractFunctionPtg) ptgF;
		if(func.getFunctionIndex() == 255) {
			throw new AssertionFailedError("Failed to recognise built-in function in formula '" 
					+ formula + "'");
		}
		assertEquals(expPtgArraySize, ptgs.length);
		assertEquals(funcIx, func.getFunctionIndex());
		Class<? extends AbstractFunctionPtg> expCls = isVarArgFunc ? FuncVarPtg.class : FuncPtg.class;
		assertEquals(expCls, ptgF.getClass());
		
		// check that parsed Ptg array converts back to formula text OK
		HSSFWorkbook book = new HSSFWorkbook();
		String reRenderedFormula = HSSFFormulaParser.toFormulaString(book, ptgs);
		assertEquals(formula, reRenderedFormula);
		book.close();
	}
	
	@Test
	public void testDatedif() throws IOException {
		int expSize = 4;   // NB would be 5 if POI added tAttrVolatile properly
		confirmFunc("DATEDIF(NOW(),NOW(),\"d\")", expSize, false, 351);
	}

	@Test
	public void testDdb() throws IOException {
		confirmFunc("DDB(1,1,1,1,1)", 6, true, 144);
	}
	
	@Test
	public void testAtan() throws IOException {
		confirmFunc("ATAN(1)", 2, false, 18);
	}
	
	@Test
	public void testUsdollar() throws IOException {
		confirmFunc("USDOLLAR(1)", 2, true, 204);
	}

	@Test
	public void testDBCS() throws IOException {
		confirmFunc("DBCS(\"abc\")", 2, false, 215);
	}
	
	@Test
	public void testIsnontext() throws IOException {
		confirmFunc("ISNONTEXT(\"abc\")", 2, false, 190);
	}
	
	@Test
	public void testDproduct() throws IOException {
		confirmFunc("DPRODUCT(C1:E5,\"HarvestYield\",G1:H2)", 4, false, 189);
	}
}