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koffice/kspread/formula.cc

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/* This file is part of the KDE project
Copyright (C) 2003,2004 Ariya Hidayat <ariya@kde.org>
Copyright (C) 2005 Tomas Mecir <mecirt@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "formula.h"
#include "kspread_cell.h"
#include "kspread_sheet.h"
#include "kspread_doc.h"
#include "kspread_util.h"
#include "kspread_value.h"
#include "valuecalc.h"
#include "valueconverter.h"
#include "valueparser.h"
#include "functions.h"
#include <limits.h>
#include <tqregexp.h>
#include <tqstring.h>
#include <tqvaluevector.h>
#include <tqvaluestack.h>
#include <klocale.h>
/*
To understand how this formula engine works, please refer to the documentation
in file DESIGN.html.
Useful references:
- "Principles of Compiler Design", A.V.Aho, J.D.Ullman, Addison Wesley, 1978
- "Writing Interactive Compilers and Interpreters", P.J. Brown,
John Wiley and Sons, 1979.
- "The Theory and Practice of Compiler Writing", J.Tremblay, P.G.Sorenson,
McGraw-Hill, 1985.
- "The Java(TM) Virtual Machine Specification", T.Lindholm, F.Yellin,
Addison-Wesley, 1997.
- "Java Virtual Machine", J.Meyer, T.Downing, O'Reilly, 1997.
*/
/*
TODO - features:
- handle Intersection
- cell reference is made relative (absolute now)
- shared formula (different owner, same data)
- relative internal representation (independent of owner)
- OASIS support
TODO - optimizations:
- handle initial formula marker = (and +)
- reuse constant already in the pool
- reuse references already in the pool
- expression optimization (e.g. 1+2+A1 becomes 3+A1)
*/
namespace KSpread
{
class Opcode
{
public:
enum { Nop = 0, Load, Ref, Cell, Range, Function, Add, Sub, Neg, Mul, Div,
Pow, Concat, Not, Equal, Less, Greater };
unsigned type;
unsigned index;
Opcode(): type(Nop), index(0) {};
Opcode( unsigned t ): type(t), index(0) {};
Opcode( unsigned t, unsigned i ): type(t), index(i) {};
};
class Formula::Private
{
public:
Formula *formula;
Cell *cell;
Sheet *sheet;
bool dirty;
bool valid;
TQString expression;
TQValueVector<Opcode> codes;
TQValueVector<Value> constants;
};
class TokenStack : public TQValueVector<Token>
{
public:
TokenStack();
bool isEmpty() const;
unsigned itemCount() const;
void push( const Token& token );
Token pop();
const Token& top();
const Token& top( unsigned index );
private:
void ensureSpace();
unsigned topIndex;
};
}
using namespace KSpread;
// for null token
const Token Token::null;
// helper function: return operator of given token text
// e.g. "*" yields Operator::Asterisk, and so on
Token::Op KSpread::matchOperator( const TQString& text )
{
Token::Op result = Token::InvalidOp;
if( text.length() == 1 )
{
TQChar p = text[0];
switch( p.tqunicode() )
{
case '+': result = Token::Plus; break;
case '-': result = Token::Minus; break;
case '*': result = Token::Asterisk; break;
case '/': result = Token::Slash; break;
case '^': result = Token::Caret; break;
case ',': result = Token::Comma; break;
case ';': result = Token::Semicolon; break;
case '(': result = Token::LeftPar; break;
case ')': result = Token::RightPar; break;
case '&': result = Token::Ampersand; break;
case '=': result = Token::Equal; break;
case '<': result = Token::Less; break;
case '>': result = Token::Greater; break;
case '%': result = Token::Percent; break;
default : result = Token::InvalidOp; break;
}
}
if( text.length() == 2 )
{
if( text == "<>" ) result = Token::NotEqual;
if( text == "<=" ) result = Token::LessEqual;
if( text == ">=" ) result = Token::GreaterEqual;
if( text == "==" ) result = Token::Equal;
}
return result;
}
// helper function: give operator precedence
// e.g. "+" is 1 while "*" is 3
static int opPrecedence( Token::Op op )
{
int prec = -1;
switch( op )
{
case Token::Percent : prec = 8; break;
case Token::Caret : prec = 7; break;
case Token::Asterisk : prec = 5; break;
case Token::Slash : prec = 6; break;
case Token::Plus : prec = 3; break;
case Token::Minus : prec = 3; break;
case Token::Ampersand : prec = 2; break;
case Token::Equal : prec = 1; break;
case Token::NotEqual : prec = 1; break;
case Token::Less : prec = 1; break;
case Token::Greater : prec = 1; break;
case Token::LessEqual : prec = 1; break;
case Token::GreaterEqual : prec = 1; break;
case Token::Semicolon : prec = 0; break;
case Token::RightPar : prec = 0; break;
case Token::LeftPar : prec = -1; break;
default: prec = -1; break;
}
return prec;
}
// helper function
static Value tokenAsValue( const Token& token )
{
Value value;
if( token.isBoolean() ) value = Value( token.asBoolean() );
else if( token.isInteger() ) value = Value( token.asInteger() );
else if( token.isFloat() ) value = Value( token.asFloat() );
else if( token.isString() ) value = Value( token.asString() );
return value;
}
/**********************
Token
**********************/
// creates a token
Token::Token( Type type, const TQString& text, int pos )
{
m_type = type;
m_text = text;
m_pos = pos;
}
// copy constructor
Token::Token( const Token& token )
{
m_type = token.m_type;
m_text = token.m_text;
m_pos = token.m_pos;
}
// assignment operator
Token& Token::operator=( const Token& token )
{
m_type = token.m_type;
m_text = token.m_text;
m_pos = token.m_pos;
return *this;
}
bool Token::asBoolean() const
{
if( !isBoolean() ) return false;
return m_text.lower() == "true";
// FIXME check also for i18n version
}
long Token::asInteger() const
{
if( isInteger() ) return m_text.toLong();
else return 0;
}
double Token::asFloat() const
{
if( isFloat() ) return m_text.toDouble();
else return 0.0;
}
TQString Token::asString() const
{
if( isString() ) return m_text.mid( 1, m_text.length()-2 );
else return TQString();
}
Token::Op Token::asOperator() const
{
if( isOperator() ) return matchOperator( m_text );
else return InvalidOp;
}
TQString Token::sheetName() const
{
if( !isCell() && !isRange() ) return TQString();
int i = m_text.tqfind( '!' );
if( i < 0 ) return TQString();
TQString sheet = m_text.left( i );
return sheet;
}
TQString Token::description() const
{
TQString desc;
switch (m_type )
{
case Boolean: desc = "Boolean"; break;
case Integer: desc = "Integer"; break;
case Float: desc = "Float"; break;
case String: desc = "String"; break;
case Identifier: desc = "Identifier"; break;
case Cell: desc = "Cell"; break;
case Range: desc = "Range"; break;
case Operator: desc = "Operator"; break;
default: desc = "Unknown"; break;
}
while( desc.length() < 10 ) desc.prepend( ' ' );
desc.prepend( " " );
desc.prepend( TQString::number( m_pos ) );
desc.append( " : " ).append( m_text );
return desc;
}
/**********************
TokenStack
**********************/
TokenStack::TokenStack(): TQValueVector<Token>()
{
topIndex = 0;
ensureSpace();
}
bool TokenStack::isEmpty() const
{
return topIndex == 0;
}
unsigned TokenStack::itemCount() const
{
return topIndex;
}
void TokenStack::push( const Token& token )
{
ensureSpace();
at( topIndex++ ) = token;
}
Token TokenStack::pop()
{
return (topIndex > 0 ) ? Token( at( --topIndex ) ) : Token();
}
const Token& TokenStack::top()
{
return top( 0 );
}
const Token& TokenStack::top( unsigned index )
{
if( topIndex > index )
return at( topIndex-index-1 );
return Token::null;
}
void TokenStack::ensureSpace()
{
while( topIndex >= size() )
resize( size() + 10 );
}
/**********************
FormulaPrivate
**********************/
// helper function: return true for valid identifier character
bool KSpread::isIdentifier( TQChar ch )
{
return ( ch.tqunicode() == '_' ) || (ch.tqunicode() == '$' ) || ( ch.isLetter() );
}
/**********************
Formula
**********************/
// Constructor
Formula::Formula (Sheet *sheet, Cell *cell)
{
d = new Private;
d->cell = cell;
d->sheet = sheet;
clear();
}
Formula::Formula()
{
d = new Private;
d->cell = 0;
d->sheet = 0;
clear();
}
// Destructor
Formula::~Formula()
{
delete d;
}
Cell* Formula::cell() const
{
return d->cell;
}
Sheet* Formula::sheet() const
{
return d->sheet;
}
// Sets a new expression for this formula.
// note that both the real lex and parse processes will happen later on
// when needed (i.e. "lazy parse"), for example during formula evaluation.
void Formula::setExpression( const TQString& expr )
{
d->expression = expr;
d->dirty = true;
d->valid = false;
}
// Returns the expression associated with this formula.
TQString Formula::expression() const
{
return d->expression;
}
// Returns the validity of the formula.
// note: empty formula is always invalid.
bool Formula::isValid() const
{
if( d->dirty )
{
KLocale* locale = d->cell ? d->cell->locale() : 0;
if ((!locale) && d->sheet)
locale = d->sheet->doc()->locale();
Tokens tokens = scan( d->expression, locale );
if( tokens.valid() )
compile( tokens );
else
d->valid = false;
}
return d->valid;
}
// Clears everything, also mark the formula as invalid.
void Formula::clear()
{
d->expression = TQString();
d->dirty = true;
d->valid = false;
d->constants.clear();
d->codes.clear();
}
// Returns list of token for the expression.
// this triggers again the lexical analysis step. it is however preferable
// (even when there's small performance penalty) because otherwise we need to
// store parsed tokens all the time which serves no good purpose.
Tokens Formula::tokens() const
{
KLocale* locale = d->cell ? d->cell->locale() : 0;
if ((!locale) && d->sheet)
locale = d->sheet->doc()->locale();
return scan( d->expression, locale );
}
Tokens Formula::scan( const TQString& expr, KLocale* locale ) const
{
// to hold the result
Tokens tokens;
// parsing state
enum { Start, Finish, Bad, InNumber, InDecimal, InExpIndicator, InExponent,
InString, InIdentifier, InCell, InRange, InSheetOrAreaName } state;
// use locale settings if specified
TQString thousand = locale ? locale->thousandsSeparator() : "";
TQString decimal = locale ? locale->decimalSymbol() : ".";
// initialize variables
state = Start;
unsigned int i = 0;
TQString ex = expr;
TQString tokenText;
int tokenStart = 0;
// first character must be equal sign (=)
if( ex[0] != '=' )
return tokens;
// but the scanner should not see this equal sign
ex.remove( 0, 1 );
// force a terminator
ex.append( TQChar() );
// main loop
while( (state != Bad) && (state != Finish) && (i < ex.length()) )
{
TQChar ch = ex[i];
switch( state )
{
case Start:
tokenStart = i;
// skip any whitespaces
if( ch.isSpace() ) i++;
// check for number
else if( ch.isDigit() )
{
state = InNumber;
}
// a string ?
else if ( ch == '"' )
{
tokenText.append( ex[i++] );
state = InString;
}
// beginning with alphanumeric ?
// could be identifier, cell, range, or function...
else if( isIdentifier( ch ) )
{
state = InIdentifier;
}
// aposthrophe (') marks sheet name for 3-d cell, e.g 'Sales Q3'!A4, or a named range
else if ( ch.tqunicode() == '\'' )
{
i++;
state = InSheetOrAreaName;
}
// decimal dot ?
else if ( ch == decimal )
{
tokenText.append( ex[i++] );
state = InDecimal;
}
// terminator character
else if ( ch == TQChar::null )
state = Finish;
// look for operator match
else
{
int op;
TQString s;
// check for two-chars operator, such as '<=', '>=', etc
s.append( ch ).append( ex[i+1] );
op = matchOperator( s );
// check for one-char operator, such as '+', ';', etc
if( op == Token::InvalidOp )
{
s = TQString( ch );
op = matchOperator( s );
}
// any matched operator ?
if( op != Token::InvalidOp )
{
int len = s.length();
i += len;
tokens.append( Token( Token::Operator, s.left( len ), tokenStart ) );
}
else state = Bad;
}
break;
case InIdentifier:
// consume as long as alpha, dollar sign, underscore, or digit
if( isIdentifier( ch ) || ch.isDigit() ) tokenText.append( ex[i++] );
// a '!' ? then this must be sheet name, e.g "Sheet4!"
else if( ch == '!' )
{
tokenText.append( ex[i++] );
state = InCell;
}
// a '(' ? then this must be a function identifier
else if( ch == '(' )
{
tokens.append (Token (Token::Identifier, tokenText, tokenStart));
tokenStart = i;
tokenText = "";
state = Start;
}
// we're done with identifier
else
{
// check for cell reference, e.g A1, VV123, ...
TQRegExp exp("(\\$?)([a-zA-Z]+)(\\$?)([0-9]+)$");
int n = exp.search( tokenText );
if( n >= 0 )
state = InCell;
else
{
if ( isNamedArea( tokenText ) )
tokens.append (Token (Token::Range, tokenText, tokenStart));
else
tokens.append (Token (Token::Identifier, tokenText, tokenStart));
tokenStart = i;
tokenText = "";
state = Start;
}
}
break;
case InCell:
// consume as long as alpha, dollar sign, underscore, or digit
if( isIdentifier( ch ) || ch.isDigit() ) tokenText.append( ex[i++] );
// we're done with cell ref, possibly with sheet name (like "Sheet2!B2")
// note that "Sheet2!TotalSales" is also possible, in which "TotalSales" is a named area
else
{
// check if it's a cell ref like A32, not named area
TQString cell;
for( int j = tokenText.length()-1; j>=0; j-- )
if( tokenText[j] == '!' )
break;
else
cell.prepend( tokenText[j] );
TQRegExp exp("(\\$?)([a-zA-Z]+)(\\$?)([0-9]+)$");
if( exp.search( cell ) != 0 )
{
// we're done with named area
// (Tomas) huh? this doesn't seem to check for named areas ...
tokens.append( Token( Token::Range, tokenText, tokenStart ) );
tokenText = "";
state = Start;
}
else
{
// so up to now we've got something like A2 or Sheet2!F4
// check for range reference
if( ch == ':' )
{
tokenText.append( ex[i++] );
state = InRange;
}
else
{
// we're done with cell reference
tokens.append( Token( Token::Cell, tokenText, tokenStart ) );
tokenText = "";
state = Start;
}
}
}
break;
case InRange:
// consume as long as alpha, dollar sign, underscore, or digit
if( isIdentifier( ch ) || ch.isDigit() ) tokenText.append( ex[i++] );
// we're done with range reference
else
{
tokens.append( Token( Token::Range, tokenText, tokenStart ) );
tokenText = "";
state = Start;
}
break;
case InSheetOrAreaName:
// consume until '
if ( ch.tqunicode() != '\'' )
tokenText.append( ex[i++] );
else
{
// eat the aposthrophe itself
++i;
// must be followed by '!' to be sheet name
if( ex[i] == '!' )
{
tokenText.append( ex[i++] );
state = InCell;
}
else
{
if ( isNamedArea( tokenText ) )
tokens.append (Token (Token::Range, tokenText, tokenStart));
else
tokens.append (Token (Token::Identifier, tokenText, tokenStart));
tokenStart = i;
tokenText = "";
state = Start;
}
}
break;
case InNumber:
// consume as long as it's digit
if( ch.isDigit() ) tokenText.append( ex[i++] );
// skip thousand separator
else if( !thousand.isEmpty() && ( ch ==thousand[0] ) ) i++;
// convert decimal separator to '.', also support '.' directly
// we always support '.' because of bug #98455
else if(( !decimal.isEmpty() && ( ch == decimal[0] ) ) || (ch == '.'))
{
tokenText.append( '.' );
i++;
state = InDecimal;
}
// exponent ?
else if( ch.upper() == 'E' )
{
tokenText.append( 'E' );
i++;
state = InExpIndicator;
}
// reference sheet delimiter?
else if( ch == '!' )
{
tokenText.append( ex[i++] );
state = InCell;
}
// identifier?
else if( isIdentifier( ch ) )
{
// has to be a sheet or area name then
state = InIdentifier;
}
// we're done with integer number
else
{
tokens.append( Token( Token::Integer, tokenText, tokenStart ) );
tokenText = "";
state = Start;
};
break;
case InDecimal:
// consume as long as it's digit
if( ch.isDigit() ) tokenText.append( ex[i++] );
// exponent ?
else if( ch.upper() == 'E' )
{
tokenText.append( 'E' );
i++;
state = InExpIndicator;
}
// we're done with floating-point number
else
{
tokens.append( Token( Token::Float, tokenText, tokenStart ) );
tokenText = "";
state = Start;
};
break;
case InExpIndicator:
// possible + or - right after E, e.g 1.23E+12 or 4.67E-8
if( ( ch == '+' ) || ( ch == '-' ) ) tokenText.append( ex[i++] );
// consume as long as it's digit
else if( ch.isDigit() ) state = InExponent;
// invalid thing here
else state = Bad;
break;
case InExponent:
// consume as long as it's digit
if( ch.isDigit() ) tokenText.append( ex[i++] );
// we're done with floating-point number
else
{
tokens.append( Token( Token::Float, tokenText, tokenStart ) );
tokenText = "";
state = Start;
};
break;
case InString:
// consume until "
if( ch != '"' ) tokenText.append( ex[i++] );
else
{
tokenText.append( ch ); i++;
tokens.append( Token( Token::String, tokenText, tokenStart ) );
tokenText = "";
state = Start;
}
break;
case Bad:
default:
break;
};
};
if( state == Bad )
tokens.setValid( false );
return tokens;
}
// will affect: dirty, valid, codes, constants
void Formula::compile( const Tokens& tokens ) const
{
// initialize variables
d->dirty = false;
d->valid = false;
d->codes.clear();
d->constants.clear();
// sanity check
if( tokens.count() == 0 ) return;
TokenStack syntaxStack;
TQValueStack<int> argStack;
unsigned argCount = 1;
for( unsigned i = 0; i <= tokens.count(); i++ )
{
// helper token: InvalidOp is end-of-formula
Token token = ( i < tokens.count() ) ? tokens[i] : Token( Token::Operator );
Token::Type tokenType = token.type();
// unknown token is invalid
if( tokenType == Token::Unknown ) break;
// for constants, push immediately to stack
// generate code to load from a constant
if ( ( tokenType == Token::Integer ) || ( tokenType == Token::Float ) ||
( tokenType == Token::String ) || ( tokenType == Token::Boolean ) )
{
syntaxStack.push( token );
d->constants.append( tokenAsValue( token ) );
d->codes.append( Opcode( Opcode::Load, d->constants.count()-1 ) );
}
// for cell, range, or identifier, push immediately to stack
// generate code to load from reference
if( ( tokenType == Token::Cell ) || ( tokenType == Token::Range ) ||
( tokenType == Token::Identifier ) )
{
syntaxStack.push( token );
d->constants.append( Value( token.text() ) );
if (tokenType == Token::Cell)
d->codes.append( Opcode( Opcode::Cell, d->constants.count()-1 ) );
else if (tokenType == Token::Range)
d->codes.append( Opcode( Opcode::Range, d->constants.count()-1 ) );
else
d->codes.append( Opcode( Opcode::Ref, d->constants.count()-1 ) );
}
// are we entering a function ?
// if token is operator, and stack already has: id ( arg
if( tokenType == Token::Operator )
if( syntaxStack.itemCount() >= 3 )
{
Token arg = syntaxStack.top();
Token par = syntaxStack.top( 1 );
Token id = syntaxStack.top( 2 );
if( !arg.isOperator() )
if( par.asOperator() == Token::LeftPar )
if( id.isIdentifier() )
{
argStack.push( argCount );
argCount = 1;
}
}
// special case for percentage
if( tokenType == Token::Operator )
if( token.asOperator() == Token::Percent )
if( syntaxStack.itemCount() >= 1 )
if( !syntaxStack.top().isOperator() )
{
d->constants.append( Value( 0.01 ) );
d->codes.append( Opcode( Opcode::Load, d->constants.count()-1 ) );
d->codes.append( Opcode( Opcode::Mul ) );
}
// for any other operator, try to apply all parsing rules
if( tokenType == Token::Operator )
if( token.asOperator() != Token::Percent )
{
// repeat until no more rule applies
for( ; ; )
{
bool ruleFound = false;
// rule for function arguments, if token is ; or )
// id ( arg1 ; arg2 -> id ( arg
if( !ruleFound )
if( syntaxStack.itemCount() >= 5 )
if( ( token.asOperator() == Token::RightPar ) ||
( token.asOperator() == Token::Semicolon ) )
{
Token arg2 = syntaxStack.top();
Token sep = syntaxStack.top( 1 );
Token arg1 = syntaxStack.top( 2 );
Token par = syntaxStack.top( 3 );
Token id = syntaxStack.top( 4 );
if( !arg2.isOperator() )
if( sep.asOperator() == Token::Semicolon )
if( !arg1.isOperator() )
if( par.asOperator() == Token::LeftPar )
if( id.isIdentifier() )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
argCount++;
}
}
// rule for function last argument:
// id ( arg ) -> arg
if( !ruleFound )
if( syntaxStack.itemCount() >= 4 )
{
Token par2 = syntaxStack.top();
Token arg = syntaxStack.top( 1 );
Token par1 = syntaxStack.top( 2 );
Token id = syntaxStack.top( 3 );
if( par2.asOperator() == Token::RightPar )
if( !arg.isOperator() )
if( par1.asOperator() == Token::LeftPar )
if( id.isIdentifier() )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.push( arg );
d->codes.append( Opcode( Opcode::Function, argCount ) );
argCount = argStack.empty() ? 0 : argStack.pop();
}
}
// rule for function call with tqparentheses, but without argument
// e.g. "2*PI()"
if( !ruleFound )
if( syntaxStack.itemCount() >= 3 )
{
Token par2 = syntaxStack.top();
Token par1 = syntaxStack.top( 1 );
Token id = syntaxStack.top( 2 );
if( par2.asOperator() == Token::RightPar )
if( par1.asOperator() == Token::LeftPar )
if( id.isIdentifier() )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.push( Token( Token::Integer ) );
d->codes.append( Opcode( Opcode::Function, 0 ) );
}
}
// rule for tqparenthesis: ( Y ) -> Y
if( !ruleFound )
if( syntaxStack.itemCount() >= 3 )
{
Token right = syntaxStack.top();
Token y = syntaxStack.top( 1 );
Token left = syntaxStack.top( 2 );
if( right.isOperator() )
if( !y.isOperator() )
if( left.isOperator() )
if( right.asOperator() == Token::RightPar )
if( left.asOperator() == Token::LeftPar )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.push( y );
}
}
// rule for binary operator: A (op) B -> A
// conditions: precedence of op >= precedence of token
// action: push (op) to result
// e.g. "A * B" becomes "A" if token is operator "+"
// exception: for caret (power operator), if op is another caret
// then the rule doesn't apply, e.g. "2^3^2" is evaluated as "2^(3^2)"
if( !ruleFound )
if( syntaxStack.itemCount() >= 3 )
{
Token b = syntaxStack.top();
Token op = syntaxStack.top( 1 );
Token a = syntaxStack.top( 2 );
if( !a.isOperator() )
if( !b.isOperator() )
if( op.isOperator() )
if( token.asOperator() != Token::LeftPar )
if( token.asOperator() != Token::Caret )
if( opPrecedence( op.asOperator() ) >= opPrecedence( token.asOperator() ) )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.push( b );
switch( op.asOperator() )
{
// simple binary operations
case Token::Plus: d->codes.append( Opcode::Add ); break;
case Token::Minus: d->codes.append( Opcode::Sub ); break;
case Token::Asterisk: d->codes.append( Opcode::Mul ); break;
case Token::Slash: d->codes.append( Opcode::Div ); break;
case Token::Caret: d->codes.append( Opcode::Pow ); break;
case Token::Ampersand: d->codes.append( Opcode::Concat ); break;
// simple value comparisons
case Token::Equal: d->codes.append( Opcode::Equal ); break;
case Token::Less: d->codes.append( Opcode::Less ); break;
case Token::Greater: d->codes.append( Opcode::Greater ); break;
// NotEqual is Equal, followed by Not
case Token::NotEqual:
d->codes.append( Opcode::Equal );
d->codes.append( Opcode::Not );
break;
// LessOrEqual is Greater, followed by Not
case Token::LessEqual:
d->codes.append( Opcode::Greater );
d->codes.append( Opcode::Not );
break;
// GreaterOrEqual is Less, followed by Not
case Token::GreaterEqual:
d->codes.append( Opcode::Less );
d->codes.append( Opcode::Not );
break;
default: break;
};
}
}
// rule for unary operator: (op1) (op2) X -> (op1) X
// conditions: op2 is unary, token is not '('
// action: push (op2) to result
// e.g. "* - 2" becomes "*"
if( !ruleFound )
if( token.asOperator() != Token::LeftPar )
if( syntaxStack.itemCount() >= 3 )
{
Token x = syntaxStack.top();
Token op2 = syntaxStack.top( 1 );
Token op1 = syntaxStack.top( 2 );
if( !x.isOperator() )
if( op1.isOperator() )
if( op2.isOperator() )
if( ( op2.asOperator() == Token::Plus ) ||
( op2.asOperator() == Token::Minus ) )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.push( x );
if( op2.asOperator() == Token::Minus )
d->codes.append( Opcode( Opcode::Neg ) );
}
}
// auxilary rule for unary operator: (op) X -> X
// conditions: op is unary, op is first in syntax stack, token is not '('
// action: push (op) to result
if( !ruleFound )
if( token.asOperator() != Token::LeftPar )
if( syntaxStack.itemCount() == 2 )
{
Token x = syntaxStack.top();
Token op = syntaxStack.top( 1 );
if( !x.isOperator() )
if( op.isOperator() )
if( ( op.asOperator() == Token::Plus ) ||
( op.asOperator() == Token::Minus ) )
{
ruleFound = true;
syntaxStack.pop();
syntaxStack.pop();
syntaxStack.push( x );
if( op.asOperator() == Token::Minus )
d->codes.append( Opcode( Opcode::Neg ) );
}
}
if( !ruleFound ) break;
}
// can't apply rules anymore, push the token
if( token.asOperator() != Token::Percent )
syntaxStack.push( token );
}
}
// syntaxStack must left only one operand and end-of-formula (i.e. InvalidOp)
d->valid = false;
if( syntaxStack.itemCount() == 2 )
if( syntaxStack.top().isOperator() )
if( syntaxStack.top().asOperator() == Token::InvalidOp )
if( !syntaxStack.top(1).isOperator() )
d->valid = true;
// bad parsing ? clean-up everything
if( !d->valid )
{
d->constants.clear();
d->codes.clear();
}
}
bool Formula::isNamedArea( const TQString& expr ) const
{
TQString tokenText( expr );
// check for named areas ...
if (d->sheet) {
const TQValueList<Reference> areas = d->sheet->doc()->listArea();
TQValueList<Reference>::const_iterator it;
for (it = areas.begin(); it != areas.end(); ++it) {
if ((*it).ref_name.lower() == tokenText.lower()) {
// we got a named area
return true;
}
}
}
return false;
}
// Evaluates the formula, returns the result.
struct stackEntry {
void reset () { row1 = col1 = row2 = col2 = -1; };
Value val;
int row1, col1, row2, col2;
};
Value Formula::eval() const
{
TQValueStack<stackEntry> stack;
stackEntry entry;
unsigned index;
Value val1, val2;
TQString c;
TQValueVector<Value> args;
Sheet *sheet = 0;
ValueParser* parser = 0;
ValueConverter* converter = 0;
ValueCalc* calc = 0;
if (d->sheet)
{
sheet = d->sheet;
converter = sheet->doc()->converter();
calc = sheet->doc()->calc();
}
else
{
parser = new ValueParser( KGlobal::locale() );
converter = new ValueConverter( parser );
calc = new ValueCalc( converter );
}
Function* function;
FuncExtra fe;
fe.mycol = fe.myrow = 0;
if (d->cell) {
fe.mycol = d->cell->column();
fe.myrow = d->cell->row();
}
if( d->dirty )
{
Tokens tokens = scan( d->expression );
d->valid = tokens.valid();
if( tokens.valid() )
compile( tokens );
}
if( !d->valid )
return Value::errorVALUE();
for( unsigned pc = 0; pc < d->codes.count(); pc++ )
{
Value ret; // for the function caller
Opcode& opcode = d->codes[pc];
index = opcode.index;
switch( opcode.type )
{
// no operation
case Opcode::Nop:
break;
// load a constant, push to stack
case Opcode::Load:
entry.reset();
entry.val = d->constants[index];
stack.push (entry);
break;
// unary operation
case Opcode::Neg:
entry.reset();
entry.val = stack.pop().val;
if (!entry.val.isError()) // do nothing if we got an error
entry.val = calc->mul (entry.val, -1);
stack.push (entry);
break;
// binary operation: take two values from stack, do the operation,
// push the result to stack
case Opcode::Add:
entry.reset();
val2 = stack.pop().val;
val1 = stack.pop().val;
val2 = calc->add( val1, val2 );
entry.reset();
entry.val = val2;
stack.push (entry);
break;
case Opcode::Sub:
val2 = stack.pop().val;
val1 = stack.pop().val;
val2 = calc->sub( val1, val2 );
entry.reset();
entry.val = val2;
stack.push (entry);
break;
case Opcode::Mul:
val2 = stack.pop().val;
val1 = stack.pop().val;
val2 = calc->mul( val1, val2 );
entry.reset();
entry.val = val2;
stack.push (entry);
break;
case Opcode::Div:
val2 = stack.pop().val;
val1 = stack.pop().val;
val2 = calc->div( val1, val2 );
entry.reset();
entry.val = val2;
stack.push (entry);
break;
case Opcode::Pow:
val2 = stack.pop().val;
val1 = stack.pop().val;
val2 = calc->pow( val1, val2 );
entry.reset();
entry.val = val2;
stack.push (entry);
break;
// string concatenation
case Opcode::Concat:
val1 = converter->asString (stack.pop().val);
val2 = converter->asString (stack.pop().val);
if (val1.isError() || val2.isError())
val1 = Value::errorVALUE();
else
val1.setValue( val2.asString().append( val1.asString() ) );
entry.reset();
entry.val = val1;
stack.push (entry);
break;
// logical not
case Opcode::Not:
val1 = converter->asBoolean (stack.pop().val);
if( val1.isError() )
val1 = Value::errorVALUE();
else
val1.setValue( !val1.asBoolean() );
entry.reset();
entry.val = val1;
stack.push (entry);
break;
// comparison
case Opcode::Equal:
val1 = stack.pop().val;
val2 = stack.pop().val;
if( !val1.allowComparison( val2 ) )
val1 = Value::errorNA();
else if( val2.compare( val1 ) == 0 )
val1 = Value (true);
else
val1 = Value (false);
entry.reset();
entry.val = val1;
stack.push (entry);
break;
// less than
case Opcode::Less:
val1 = stack.pop().val;
val2 = stack.pop().val;
if( !val1.allowComparison( val2 ) )
val1 = Value::errorNA();
else if( val2.compare( val1 ) < 0 )
val1 = Value (true);
else
val1 = Value (false);
entry.reset();
entry.val = val1;
stack.push (entry);
break;
// greater than
case Opcode::Greater:
val1 = stack.pop().val;
val2 = stack.pop().val;
if( !val1.allowComparison( val2 ) )
val1 = Value::errorNA();
else if( val2.compare( val1 ) > 0 )
val1 = Value (true);
else
val1 = Value (false);
entry.reset();
entry.val = val1;
stack.push (entry);
break;
case Opcode::Cell:
c = d->constants[index].asString();
val1 = Value::empty();
entry.reset();
if (sheet)
{
Point cell (c, sheet->workbook(), sheet);
if (cell.isValid())
{
val1 = cell.sheet()->value (cell.column(), cell.row());
// store the reference, so we can use it within functions
entry.col1 = entry.col2 = cell.column();
entry.row1 = entry.row2 = cell.row();
}
}
entry.val = val1;
stack.push (entry);
break;
case Opcode::Range:
c = d->constants[index].asString();
val1 = Value::empty();
entry.reset();
if (sheet)
{
Range range (c, sheet->workbook(), sheet);
if (range.isValid())
{
val1 = range.sheet()->valueRange (range.startCol(), range.startRow(),
range.endCol(), range.endRow());
// store the reference, so we can use it within functions
entry.col1 = range.startCol();
entry.row1 = range.startRow();
entry.col2 = range.endCol();
entry.row2 = range.endRow();
}
}
entry.val = val1;
stack.push (entry);
break;
case Opcode::Ref:
val1 = d->constants[index];
entry.reset();
entry.val = val1;
stack.push (entry);
break;
// calling function
case Opcode::Function:
if( stack.count() < index )
// (Tomas) umm, how could that be ? I mean, the index value
// is computed from the stack *confused*
return Value::errorVALUE(); // not enough arguments
args.clear();
fe.ranges.clear ();
fe.ranges.reserve (index);
fe.sheet = sheet;
for( ; index; index-- )
{
stackEntry e = stack.pop();
args.insert (args.begin(), e.val);
// TODO: create and fill a FunctionExtra object, if needed
// problem: we don't know if we need it, as we don't have the
// fuction name yet ...
fe.ranges[index - 1].col1 = e.col1;
fe.ranges[index - 1].row1 = e.row1;
fe.ranges[index - 1].col2 = e.col2;
fe.ranges[index - 1].row2 = e.row2;
}
// function name as string value
val1 = converter->asString (stack.pop().val);
if( val1.isError() )
return Value::errorVALUE();
function = FunctionRepository::self()->function ( val1.asString() );
if( !function )
return Value::errorVALUE(); // no such function
ret = function->exec (args, calc, &fe);
entry.reset();
entry.val = ret;
stack.push (entry);
break;
default:
break;
}
}
if (!d->sheet) {
delete parser;
delete converter;
delete calc;
}
// more than one value in stack ? unsuccesful execution...
if( stack.count() != 1 )
return Value::errorVALUE();
return stack.pop().val;
}
// Debugging aid
TQString Formula::dump() const
{
TQString result;
if( d->dirty )
{
Tokens tokens = scan( d->expression );
compile( tokens );
}
result = TQString("Expression: [%1]\n").tqarg( d->expression );
#if 0
Value value = eval();
result.append( TQString("Result: %1\n").tqarg(
converter->asString(value).asString() ) );
#endif
result.append(" Constants:\n");
for( unsigned c = 0; c < d->constants.count(); c++ )
{
TQString vtext;
Value val = d->constants[c];
if( val.isString() ) vtext = TQString("[%1]").tqarg( val.asString() );
else if( val.isNumber() ) vtext = TQString("%1").tqarg( val.asFloat() );
else if( val.isBoolean() ) vtext = TQString("%1").tqarg( val.asBoolean() ? "True":"False");
else if( val.isError() ) vtext = "error";
else vtext = "???";
result += TQString(" #%1 = %2\n").tqarg(c).tqarg( vtext );
}
result.append("\n");
result.append(" Code:\n");
for( unsigned i = 0; i < d->codes.count(); i++ )
{
TQString ctext;
switch( d->codes[i].type )
{
case Opcode::Load: ctext = TQString("Load #%1").tqarg( d->codes[i].index ); break;
case Opcode::Ref: ctext = TQString("Ref #%1").tqarg( d->codes[i].index ); break;
case Opcode::Function: ctext = TQString("Function (%1)").tqarg( d->codes[i].index ); break;
case Opcode::Add: ctext = "Add"; break;
case Opcode::Sub: ctext = "Sub"; break;
case Opcode::Mul: ctext = "Mul"; break;
case Opcode::Div: ctext = "Div"; break;
case Opcode::Neg: ctext = "Neg"; break;
case Opcode::Concat: ctext = "Concat"; break;
case Opcode::Pow: ctext = "Pow"; break;
case Opcode::Equal: ctext = "Equal"; break;
case Opcode::Not: ctext = "Not"; break;
case Opcode::Less: ctext = "Less"; break;
case Opcode::Greater: ctext = "Greater"; break;
default: ctext = "Unknown"; break;
}
result.append( " " ).append( ctext ).append("\n");
}
return result;
}
TQTextStream& operator<<( TQTextStream& ts, Formula formula )
{
ts << formula.dump();
return ts;
}