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Patch from Josh from bug #44609 - Handle leading spaces in formulas, such as '= 4'

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@637601 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2008-03-16 15:48:02 +00:00
parent 6b34b1a70f
commit bc88b7b1f4
5 changed files with 131 additions and 47 deletions
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1
src/documentation/content/xdocs/changes.xml
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@ -36,6 +36,7 @@
<!-- Don't forget to update status.xml too! -->
<release version="3.1-beta1" date="2008-??-??">
<action dev="POI-DEVELOPERS" type="fix">44609 - Handle leading spaces in formulas, such as '= 4'</action>
<action dev="POI-DEVELOPERS" type="add">44608 - Support for PercentPtg in the formula evaluator</action>
<action dev="POI-DEVELOPERS" type="fix">44606 - Support calculated string values for evaluated formulas</action>
<action dev="POI-DEVELOPERS" type="add">Add accessors to horizontal and vertical alignment in HSSFTextbox</action>

1
src/documentation/content/xdocs/status.xml
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@ -33,6 +33,7 @@
<!-- Don't forget to update changes.xml too! -->
<changes>
<release version="3.1-beta1" date="2008-??-??">
<action dev="POI-DEVELOPERS" type="fix">44609 - Handle leading spaces in formulas, such as '= 4'</action>
<action dev="POI-DEVELOPERS" type="add">44608 - Support for PercentPtg in the formula evaluator</action>
<action dev="POI-DEVELOPERS" type="fix">44606 - Support calculated string values for evaluated formulas</action>
<action dev="POI-DEVELOPERS" type="add">Add accessors to horizontal and vertical alignment in HSSFTextbox</action>

37
src/java/org/apache/poi/hssf/model/FormulaParser.java
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@ -943,23 +943,7 @@ end;
}
Stack stack = new Stack();
// Excel allows to have AttrPtg at position 0 (such as Blanks) which
// do not have any operands. Skip them.
int i;
if(ptgs[0] instanceof AttrPtg) {
AttrPtg attrPtg0 = (AttrPtg) ptgs[0];
if(attrPtg0.isSemiVolatile()) {
// no visible formula for semi-volatile
} else {
// TODO -this requirement is unclear and is not addressed by any junits
stack.push(ptgs[0].toFormulaString(book));
}
i=1;
} else {
i=0;
}
for ( ; i < ptgs.length; i++) {
for (int i=0 ; i < ptgs.length; i++) {
Ptg ptg = ptgs[i];
// TODO - what about MemNoMemPtg?
if(ptg instanceof MemAreaPtg || ptg instanceof MemFuncPtg || ptg instanceof MemErrPtg) {
@ -973,21 +957,30 @@ end;
continue;
}
if (ptg instanceof AttrPtg && ((AttrPtg) ptg).isOptimizedIf()) {
if (ptg instanceof AttrPtg) {
AttrPtg attrPtg = ((AttrPtg) ptg);
if (attrPtg.isOptimizedIf()) {
continue;
}
if (attrPtg.isSpace()) {
// POI currently doesn't render spaces in formulas
continue;
// but if it ever did, care must be taken:
// tAttrSpace comes *before* the operand it applies to, which may be consistent
// with how the formula text appears but is against the RPN ordering assumed here
}
}
final OperationPtg o = (OperationPtg) ptg;
int nOperands = o.getNumberOfOperands();
final String[] operands = new String[nOperands];
for (int j = nOperands-1; j >= 0; j--) {
for (int j = nOperands-1; j >= 0; j--) { // reverse iteration because args were pushed in-order
if(stack.isEmpty()) {
//TODO: write junit to prove this works
String msg = "Too few arguments suppled to operation token ("
+ o.getClass().getName() + "). Expected (" + nOperands
+ " but got " + (nOperands - j + 1);
throw new FormulaParseException(msg);
+ ") operands but got (" + (nOperands - j + 1) + ")";
throw new IllegalStateException(msg);
}
operands[j] = (String) stack.pop();
}

93
src/java/org/apache/poi/hssf/record/formula/AttrPtg.java
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@ -33,20 +33,42 @@ import org.apache.poi.util.BitFieldFactory;
* @author Jason Height (jheight at chariot dot net dot au)
*/
public class AttrPtg
extends OperationPtg
{
public final class AttrPtg extends OperationPtg {
public final static byte sid = 0x19;
private final static int SIZE = 4;
private byte field_1_options;
private short field_2_data;
private BitField semiVolatile = BitFieldFactory.getInstance(0x01);
private BitField optiIf = BitFieldFactory.getInstance(0x02);
private BitField optiChoose = BitFieldFactory.getInstance(0x04);
private BitField optGoto = BitFieldFactory.getInstance(0x08);
private BitField sum = BitFieldFactory.getInstance(0x10);
private BitField baxcel = BitFieldFactory.getInstance(0x20);
private BitField space = BitFieldFactory.getInstance(0x40);
// flags 'volatile' and 'space', can be combined.
// OOO spec says other combinations are theoretically possible but not likely to occur.
private static final BitField semiVolatile = BitFieldFactory.getInstance(0x01);
private static final BitField optiIf = BitFieldFactory.getInstance(0x02);
private static final BitField optiChoose = BitFieldFactory.getInstance(0x04);
private static final BitField optGoto = BitFieldFactory.getInstance(0x08); // skip
private static final BitField sum = BitFieldFactory.getInstance(0x10);
private static final BitField baxcel = BitFieldFactory.getInstance(0x20); // 'assignment-style formula in a macro sheet'
private static final BitField space = BitFieldFactory.getInstance(0x40);
public static final class SpaceType {
private SpaceType() {
// no instances of this class
}
/** 00H = Spaces before the next token (not allowed before tParen token) */
public static final int SPACE_BEFORE = 0x00;
/** 01H = Carriage returns before the next token (not allowed before tParen token) */
public static final int CR_BEFORE = 0x01;
/** 02H = Spaces before opening parenthesis (only allowed before tParen token) */
public static final int SPACE_BEFORE_OPEN_PAREN = 0x02;
/** 03H = Carriage returns before opening parenthesis (only allowed before tParen token) */
public static final int CR_BEFORE_OPEN_PAREN = 0x03;
/** 04H = Spaces before closing parenthesis (only allowed before tParen, tFunc, and tFuncVar tokens) */
public static final int SPACE_BEFORE_CLOSE_PAERN = 0x04;
/** 05H = Carriage returns before closing parenthesis (only allowed before tParen, tFunc, and tFuncVar tokens) */
public static final int CR_BEFORE_CLOSE_PAREN = 0x05;
/** 06H = Spaces following the equality sign (only in macro sheets) */
public static final int SPACE_AFTER_EQUALITY = 0x06;
}
public AttrPtg() {
}
@ -56,6 +78,19 @@ public class AttrPtg
field_1_options = in.readByte();
field_2_data = in.readShort();
}
private AttrPtg(int options, int data) {
field_1_options = (byte) options;
field_2_data = (short) data;
}
/**
* @param type a constant from <tt>SpaceType</tt>
* @param count the number of space characters
*/
public static AttrPtg createSpace(int type, int count) {
int data = type & 0x00FF | (count << 8) & 0x00FFFF;
return new AttrPtg(space.set(0), data);
}
public void setOptions(byte options)
{
@ -131,21 +166,31 @@ public class AttrPtg
return field_2_data;
}
public String toString()
{
StringBuffer buffer = new StringBuffer();
public String toString() {
StringBuffer sb = new StringBuffer(64);
sb.append(getClass().getName()).append(" [");
buffer.append("AttrPtg\n");
buffer.append("options=").append(field_1_options).append("\n");
buffer.append("data =").append(field_2_data).append("\n");
buffer.append("semi =").append(isSemiVolatile()).append("\n");
buffer.append("optimif=").append(isOptimizedIf()).append("\n");
buffer.append("optchos=").append(isOptimizedChoose()).append("\n");
buffer.append("isGoto =").append(isGoto()).append("\n");
buffer.append("isSum =").append(isSum()).append("\n");
buffer.append("isBaxce=").append(isBaxcel()).append("\n");
buffer.append("isSpace=").append(isSpace()).append("\n");
return buffer.toString();
if(isSemiVolatile()) {
sb.append("volatile ");
}
if(isSpace()) {
sb.append("space count=").append((field_2_data >> 8) & 0x00FF);
sb.append(" type=").append(field_2_data & 0x00FF).append(" ");
}
// the rest seem to be mutually exclusive
if(isOptimizedIf()) {
sb.append("if dist=").append(getData());
} else if(isOptimizedChoose()) {
sb.append("choose dist=").append(getData());
} else if(isGoto()) {
sb.append("skip dist=").append(getData());
} else if(isSum()) {
sb.append("sum ");
} else if(isBaxcel()) {
sb.append("assign ");
}
sb.append("]");
return sb.toString();
}
public void writeBytes(byte [] array, int offset)

44
src/testcases/org/apache/poi/hssf/model/TestFormulaParser.java
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@ -844,4 +844,48 @@ public final class TestFormulaParser extends TestCase {
}
assertEquals("SUM(A32769:A32770)", cell.getCellFormula());
}
public void testSpaceAtStartOfFormula() {
// Simulating cell formula of "= 4" (note space)
// The same Ptg array can be observed if an excel file is saved with that exact formula
AttrPtg spacePtg = AttrPtg.createSpace(AttrPtg.SpaceType.SPACE_BEFORE, 1);
Ptg[] ptgs = { spacePtg, new IntPtg(4), };
String formulaString;
try {
formulaString = FormulaParser.toFormulaString(null, ptgs);
} catch (IllegalStateException e) {
if(e.getMessage().equalsIgnoreCase("too much stuff left on the stack")) {
throw new AssertionFailedError("Identified bug 44609");
}
// else some unexpected error
throw e;
}
// FormulaParser strips spaces anyway
assertEquals("4", formulaString);
ptgs = new Ptg[] { new IntPtg(3), spacePtg, new IntPtg(4), spacePtg, new AddPtg()};
formulaString = FormulaParser.toFormulaString(null, ptgs);
assertEquals("3+4", formulaString);
}
/**
* Checks some internal error detecting logic ('stack underflow error' in toFormulaString)
*/
public void testTooFewOperandArgs() {
// Simulating badly encoded cell formula of "=/1"
// Not sure if Excel could ever produce this
Ptg[] ptgs = {
// Excel would probably have put tMissArg here
new IntPtg(1),
new DividePtg(),
};
try {
FormulaParser.toFormulaString(null, ptgs);
fail("Expected exception was not thrown");
} catch (IllegalStateException e) {
// expected during successful test
assertTrue(e.getMessage().startsWith("Too few arguments suppled to operation token"));
}
}
}