org.apache.poi.ss.formula.ptg.Ptg Maven / Gradle / Ivy
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See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula.ptg;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.util.LittleEndianByteArrayOutputStream;
import org.apache.poi.util.LittleEndianInput;
import org.apache.poi.util.LittleEndianOutput;
/**
* Ptg represents a syntactic token in a formula. 'PTG' is an acronym for
* 'parse thing'. Originally, the name referred to the single
* byte identifier at the start of the token, but in POI, Ptg encapsulates
* the whole formula token (initial byte + value data).
*
*
* Ptgs are logically arranged in a tree representing the structure of the
* parsed formula. However, in BIFF files Ptgs are written/read in
* Reverse-Polish Notation order. The RPN ordering also simplifies formula
* evaluation logic, so POI mostly accesses Ptgs in the same way.
*/
public abstract class Ptg {
public static final Ptg[] EMPTY_PTG_ARRAY = { };
/**
* Reads size bytes of the input stream, to create an array of Ptgs.
* Extra data (beyond size) may be read if and ArrayPtgs are present.
*/
public static Ptg[] readTokens(int size, LittleEndianInput in) {
List temp = new ArrayList<>(4 + size / 2);
int pos = 0;
boolean hasArrayPtgs = false;
while (pos < size) {
Ptg ptg = Ptg.createPtg(in);
if (ptg instanceof ArrayPtg.Initial) {
hasArrayPtgs = true;
}
pos += ptg.getSize();
temp.add(ptg);
}
if(pos != size) {
throw new RuntimeException("Ptg array size mismatch");
}
if (hasArrayPtgs) {
Ptg[] result = toPtgArray(temp);
for (int i=0;i= 0x60) {
retval.setClass(CLASS_ARRAY);
} else if (id >= 0x40) {
retval.setClass(CLASS_VALUE);
} else {
retval.setClass(CLASS_REF);
}
return retval;
}
private static Ptg createClassifiedPtg(byte id, LittleEndianInput in) {
int baseId = id & 0x1F | 0x20;
switch (baseId) {
case ArrayPtg.sid: return new ArrayPtg.Initial(in);//0x20, 0x40, 0x60
case FuncPtg.sid: return FuncPtg.create(in); // 0x21, 0x41, 0x61
case FuncVarPtg.sid: return FuncVarPtg.create(in);//0x22, 0x42, 0x62
case NamePtg.sid: return new NamePtg(in); // 0x23, 0x43, 0x63
case RefPtg.sid: return new RefPtg(in); // 0x24, 0x44, 0x64
case AreaPtg.sid: return new AreaPtg(in); // 0x25, 0x45, 0x65
case MemAreaPtg.sid: return new MemAreaPtg(in); // 0x26, 0x46, 0x66
case MemErrPtg.sid: return new MemErrPtg(in); // 0x27, 0x47, 0x67
case MemFuncPtg.sid: return new MemFuncPtg(in); // 0x29, 0x49, 0x69
case RefErrorPtg.sid: return new RefErrorPtg(in); // 0x2a, 0x4a, 0x6a
case AreaErrPtg.sid: return new AreaErrPtg(in); // 0x2b, 0x4b, 0x6b
case RefNPtg.sid: return new RefNPtg(in); // 0x2c, 0x4c, 0x6c
case AreaNPtg.sid: return new AreaNPtg(in); // 0x2d, 0x4d, 0x6d
case NameXPtg.sid: return new NameXPtg(in); // 0x39, 0x49, 0x79
case Ref3DPtg.sid: return new Ref3DPtg(in); // 0x3a, 0x5a, 0x7a
case Area3DPtg.sid: return new Area3DPtg(in); // 0x3b, 0x5b, 0x7b
case DeletedRef3DPtg.sid: return new DeletedRef3DPtg(in); // 0x3c, 0x5c, 0x7c
case DeletedArea3DPtg.sid: return new DeletedArea3DPtg(in); // 0x3d, 0x5d, 0x7d
}
throw new UnsupportedOperationException(" Unknown Ptg in Formula: 0x"+
Integer.toHexString(id) + " (" + ( int ) id + ")");
}
private static Ptg createBasePtg(byte id, LittleEndianInput in) {
switch(id) {
case 0x00: return new UnknownPtg(id); // TODO - not a real Ptg
case ExpPtg.sid: return new ExpPtg(in); // 0x01
case TblPtg.sid: return new TblPtg(in); // 0x02
case AddPtg.sid: return AddPtg.instance; // 0x03
case SubtractPtg.sid: return SubtractPtg.instance; // 0x04
case MultiplyPtg.sid: return MultiplyPtg.instance; // 0x05
case DividePtg.sid: return DividePtg.instance; // 0x06
case PowerPtg.sid: return PowerPtg.instance; // 0x07
case ConcatPtg.sid: return ConcatPtg.instance; // 0x08
case LessThanPtg.sid: return LessThanPtg.instance; // 0x09
case LessEqualPtg.sid: return LessEqualPtg.instance; // 0x0a
case EqualPtg.sid: return EqualPtg.instance; // 0x0b
case GreaterEqualPtg.sid: return GreaterEqualPtg.instance;// 0x0c
case GreaterThanPtg.sid: return GreaterThanPtg.instance; // 0x0d
case NotEqualPtg.sid: return NotEqualPtg.instance; // 0x0e
case IntersectionPtg.sid: return IntersectionPtg.instance;// 0x0f
case UnionPtg.sid: return UnionPtg.instance; // 0x10
case RangePtg.sid: return RangePtg.instance; // 0x11
case UnaryPlusPtg.sid: return UnaryPlusPtg.instance; // 0x12
case UnaryMinusPtg.sid: return UnaryMinusPtg.instance; // 0x13
case PercentPtg.sid: return PercentPtg.instance; // 0x14
case ParenthesisPtg.sid: return ParenthesisPtg.instance; // 0x15
case MissingArgPtg.sid: return MissingArgPtg.instance; // 0x16
case StringPtg.sid: return new StringPtg(in); // 0x17
// not implemented yet: case SxNamePtg.sid: return new SxNamePtg(in); // 0x18
case AttrPtg.sid: return new AttrPtg(in); // 0x19
case ErrPtg.sid: return ErrPtg.read(in); // 0x1c
case BoolPtg.sid: return BoolPtg.read(in); // 0x1d
case IntPtg.sid: return new IntPtg(in); // 0x1e
case NumberPtg.sid: return new NumberPtg(in); // 0x1f
}
throw new RuntimeException("Unexpected base token id (" + id + ")");
}
private static Ptg[] toPtgArray(List l) {
if (l.isEmpty()) {
return EMPTY_PTG_ARRAY;
}
Ptg[] result = new Ptg[l.size()];
l.toArray(result);
return result;
}
/**
* This method will return the same result as {@link #getEncodedSizeWithoutArrayData(Ptg[])}
* if there are no array tokens present.
* @return the full size taken to encode the specified Ptgs
*/
public static int getEncodedSize(Ptg[] ptgs) {
int result = 0;
for (Ptg ptg : ptgs) {
result += ptg.getSize();
}
return result;
}
/**
* Used to calculate value that should be encoded at the start of the encoded Ptg token array;
* @return the size of the encoded Ptg tokens not including any trailing array data.
*/
public static int getEncodedSizeWithoutArrayData(Ptg[] ptgs) {
int result = 0;
for (Ptg ptg : ptgs) {
if (ptg instanceof ArrayPtg) {
result += ArrayPtg.PLAIN_TOKEN_SIZE;
} else {
result += ptg.getSize();
}
}
return result;
}
/**
* Writes the ptgs to the data buffer, starting at the specified offset.
*
*
* The 2 byte encode length field is not written by this method.
* @return number of bytes written
*/
public static int serializePtgs(Ptg[] ptgs, byte[] array, int offset) {
LittleEndianByteArrayOutputStream out = new LittleEndianByteArrayOutputStream(array, offset); // NOSONAR
List arrayPtgs = null;
for (Ptg ptg : ptgs) {
ptg.write(out);
if (ptg instanceof ArrayPtg) {
if (arrayPtgs == null) {
arrayPtgs = new ArrayList<>(5);
}
arrayPtgs.add(ptg);
}
}
if (arrayPtgs != null) {
for (Ptg arrayPtg : arrayPtgs) {
ArrayPtg p = (ArrayPtg) arrayPtg;
p.writeTokenValueBytes(out);
}
}
return out.getWriteIndex() - offset;
}
/**
* @return the encoded length of this Ptg, including the initial Ptg type identifier byte.
*/
public abstract int getSize();
public abstract void write(LittleEndianOutput out);
/**
* return a string representation of this token alone
*/
public abstract String toFormulaString();
/** Overridden toString method to ensure object hash is not printed.
* This helps get rid of gratuitous diffs when comparing two dumps
* Subclasses may output more relevant information by overriding this method
**/
@Override
public String toString(){
return this.getClass().toString();
}
public static final byte CLASS_REF = 0x00;
public static final byte CLASS_VALUE = 0x20;
public static final byte CLASS_ARRAY = 0x40;
private byte ptgClass = CLASS_REF; //base ptg
public final void setClass(byte thePtgClass) {
if (isBaseToken()) {
throw new RuntimeException("setClass should not be called on a base token");
}
ptgClass = thePtgClass;
}
/**
* @return the 'operand class' (REF/VALUE/ARRAY) for this Ptg
*/
public final byte getPtgClass() {
return ptgClass;
}
/**
* Debug / diagnostic method to get this token's 'operand class' type.
* @return 'R' for 'reference', 'V' for 'value', 'A' for 'array' and '.' for base tokens
*/
public final char getRVAType() {
if (isBaseToken()) {
return '.';
}
switch (ptgClass) {
case Ptg.CLASS_REF: return 'R';
case Ptg.CLASS_VALUE: return 'V';
case Ptg.CLASS_ARRAY: return 'A';
}
throw new RuntimeException("Unknown operand class (" + ptgClass + ")");
}
public abstract byte getDefaultOperandClass();
/**
* @return false if this token is classified as 'reference', 'value', or 'array'
*/
public abstract boolean isBaseToken();
public static boolean doesFormulaReferToDeletedCell(Ptg[] ptgs) {
for (Ptg ptg : ptgs) {
if (isDeletedCellRef(ptg)) {
return true;
}
}
return false;
}
private static boolean isDeletedCellRef(Ptg ptg) {
if (ptg == ErrPtg.REF_INVALID) {
return true;
}
if (ptg instanceof DeletedArea3DPtg) {
return true;
}
if (ptg instanceof DeletedRef3DPtg) {
return true;
}
if (ptg instanceof AreaErrPtg) {
return true;
}
if (ptg instanceof RefErrorPtg) {
return true;
}
return false;
}
}