373 lines
9.6 KiB
C++
373 lines
9.6 KiB
C++
/*
|
|
This file is part of libeval, a simple math expression evaluator
|
|
|
|
Copyright (C) 2017 Michael Geselbracht, mgeselbracht3@gmail.com
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
#include <libeval/numeric_evaluator.h>
|
|
|
|
/* The (generated) lemon parser is written in C.
|
|
* In order to keep its symbol from the global namespace include the parser code with
|
|
* a C++ namespace.
|
|
*/
|
|
namespace numEval
|
|
{
|
|
|
|
#ifdef __GNUC__
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wunused-variable"
|
|
#pragma GCC diagnostic ignored "-Wsign-compare"
|
|
#endif
|
|
|
|
#include "grammar.c"
|
|
#include "grammar.h"
|
|
|
|
#ifdef __GNUC__
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
} /* namespace numEval */
|
|
|
|
|
|
NUMERIC_EVALUATOR::NUMERIC_EVALUATOR( EDA_UNITS_T aUnits, bool aUseMils )
|
|
{
|
|
struct lconv* lc = localeconv();
|
|
m_localeDecimalSeparator = *lc->decimal_point;
|
|
|
|
m_parseError = false;
|
|
m_parseFinished = false;
|
|
|
|
m_parser = numEval::ParseAlloc( malloc );
|
|
|
|
switch( aUnits )
|
|
{
|
|
case INCHES:
|
|
if( aUseMils )
|
|
m_defaultUnits = Unit::Mil;
|
|
else
|
|
m_defaultUnits = Unit::Inch;
|
|
break;
|
|
case MILLIMETRES:m_defaultUnits = Unit::Metric;
|
|
break;
|
|
default:m_defaultUnits = Unit::Metric;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
NUMERIC_EVALUATOR::~NUMERIC_EVALUATOR()
|
|
{
|
|
numEval::ParseFree( m_parser, free );
|
|
|
|
// Allow explicit call to destructor
|
|
m_parser = nullptr;
|
|
|
|
Clear();
|
|
}
|
|
|
|
|
|
void NUMERIC_EVALUATOR::Clear()
|
|
{
|
|
free( m_token.token );
|
|
m_token.token = nullptr;
|
|
m_token.input = nullptr;
|
|
m_parseError = true;
|
|
m_originalText = wxEmptyString;
|
|
}
|
|
|
|
|
|
void NUMERIC_EVALUATOR::parseError( const char* s )
|
|
{
|
|
m_parseError = true;
|
|
}
|
|
|
|
|
|
void NUMERIC_EVALUATOR::parseOk()
|
|
{
|
|
m_parseFinished = true;
|
|
}
|
|
|
|
|
|
void NUMERIC_EVALUATOR::parseSetResult( double val )
|
|
{
|
|
snprintf( m_token.token, m_token.OutLen, "%.10g", val );
|
|
}
|
|
|
|
|
|
wxString NUMERIC_EVALUATOR::OriginalText() const
|
|
{
|
|
return m_originalText;
|
|
}
|
|
|
|
|
|
bool NUMERIC_EVALUATOR::Process( const wxString& aString )
|
|
{
|
|
// Feed parser token after token until end of input.
|
|
|
|
newString( aString );
|
|
m_parseError = false;
|
|
m_parseFinished = false;
|
|
Token tok;
|
|
|
|
if( aString.IsEmpty() )
|
|
{
|
|
m_parseFinished = true;
|
|
return true;
|
|
}
|
|
|
|
do
|
|
{
|
|
tok = getToken();
|
|
numEval::Parse( m_parser, tok.token, tok.value, this );
|
|
|
|
if( m_parseFinished || tok.token == ENDS )
|
|
{
|
|
// Reset parser by passing zero as token ID, value is ignored.
|
|
numEval::Parse( m_parser, 0, tok.value, this );
|
|
break;
|
|
}
|
|
} while( tok.token );
|
|
|
|
return !m_parseError;
|
|
}
|
|
|
|
|
|
void NUMERIC_EVALUATOR::newString( const wxString& aString )
|
|
{
|
|
Clear();
|
|
|
|
m_originalText = aString;
|
|
|
|
m_token.token = reinterpret_cast<decltype( m_token.token )>( malloc( TokenStat::OutLen + 1 ) );
|
|
strcpy( m_token.token, "0" );
|
|
m_token.inputLen = aString.length();
|
|
m_token.pos = 0;
|
|
m_token.input = aString.mb_str();
|
|
|
|
m_parseFinished = false;
|
|
}
|
|
|
|
|
|
NUMERIC_EVALUATOR::Token NUMERIC_EVALUATOR::getToken()
|
|
{
|
|
Token retval;
|
|
size_t idx;
|
|
|
|
retval.token = ENDS;
|
|
retval.value.dValue = 0;
|
|
|
|
if( m_token.token == nullptr )
|
|
return retval;
|
|
|
|
if( m_token.input == nullptr )
|
|
return retval;
|
|
|
|
if( m_token.pos >= m_token.inputLen )
|
|
return retval;
|
|
|
|
auto isDecimalSeparator = [ & ]( char ch ) -> bool {
|
|
return ( ch == m_localeDecimalSeparator || ch == '.' || ch == ',' );
|
|
};
|
|
|
|
// Lambda: get value as string, store into clToken.token and update current index.
|
|
auto extractNumber = [ & ]() {
|
|
bool haveSeparator = false;
|
|
idx = 0;
|
|
auto ch = m_token.input[ m_token.pos ];
|
|
|
|
do
|
|
{
|
|
if( isDecimalSeparator( ch ) && haveSeparator )
|
|
break;
|
|
|
|
m_token.token[ idx++ ] = ch;
|
|
|
|
if( isDecimalSeparator( ch ))
|
|
haveSeparator = true;
|
|
|
|
ch = m_token.input[ ++m_token.pos ];
|
|
} while( isdigit( ch ) || isDecimalSeparator( ch ));
|
|
|
|
m_token.token[ idx ] = 0;
|
|
|
|
// Ensure that the systems decimal separator is used
|
|
for( int i = strlen( m_token.token ); i; i-- )
|
|
if( isDecimalSeparator( m_token.token[ i - 1 ] ))
|
|
m_token.token[ i - 1 ] = m_localeDecimalSeparator;
|
|
};
|
|
|
|
// Lamda: Get unit for current token.
|
|
// Valid units are ", in, mm, mil and thou. Returns Unit::Invalid otherwise.
|
|
auto checkUnit = [ this ]() -> Unit {
|
|
char ch = m_token.input[ m_token.pos ];
|
|
|
|
if( ch == '"' )
|
|
{
|
|
m_token.pos++;
|
|
return Unit::Inch;
|
|
}
|
|
|
|
// Do not use strcasecmp() as it is not available on all platforms
|
|
const char* cptr = &m_token.input[ m_token.pos ];
|
|
const auto sizeLeft = m_token.inputLen - m_token.pos;
|
|
|
|
if( sizeLeft >= 2 && ch == 'm' && cptr[ 1 ] == 'm' && !isalnum( cptr[ 2 ] ))
|
|
{
|
|
m_token.pos += 2;
|
|
return Unit::Metric;
|
|
}
|
|
|
|
if( sizeLeft >= 2 && ch == 'i' && cptr[ 1 ] == 'n' && !isalnum( cptr[ 2 ] ))
|
|
{
|
|
m_token.pos += 2;
|
|
return Unit::Inch;
|
|
}
|
|
|
|
if( sizeLeft >= 3 && ch == 'm' && cptr[ 1 ] == 'i' && cptr[ 2 ] == 'l' && !isalnum( cptr[ 3 ] ))
|
|
{
|
|
m_token.pos += 3;
|
|
return Unit::Mil;
|
|
}
|
|
|
|
if( sizeLeft >= 4 && ch == 't' && cptr[ 1 ] == 'h' && cptr[ 2 ] == 'o' && cptr[ 3 ] == 'u' && !isalnum( cptr[ 4 ] ))
|
|
{
|
|
m_token.pos += 4;
|
|
return Unit::Mil;
|
|
}
|
|
|
|
return Unit::Invalid;
|
|
};
|
|
|
|
char ch;
|
|
|
|
// Start processing of first/next token: Remove whitespace
|
|
for( ;; )
|
|
{
|
|
ch = m_token.input[ m_token.pos ];
|
|
|
|
if( ch == ' ' )
|
|
m_token.pos++;
|
|
else
|
|
break;
|
|
}
|
|
|
|
Unit convertFrom;
|
|
|
|
if( ch == 0 )
|
|
{
|
|
/* End of input */
|
|
}
|
|
else if( isdigit( ch ) || isDecimalSeparator( ch ))
|
|
{
|
|
// VALUE
|
|
extractNumber();
|
|
retval.token = VALUE;
|
|
retval.value.dValue = atof( m_token.token );
|
|
}
|
|
else if(( convertFrom = checkUnit()) != Unit::Invalid )
|
|
{
|
|
// UNIT
|
|
// Units are appended to a VALUE.
|
|
// Determine factor to default unit if unit for value is given.
|
|
// Example: Default is mm, unit is inch: factor is 25.4
|
|
// The factor is assigned to the terminal UNIT. The actual
|
|
// conversion is done within a parser action.
|
|
retval.token = UNIT;
|
|
if( m_defaultUnits == Unit::Metric )
|
|
{
|
|
switch( convertFrom )
|
|
{
|
|
case Unit::Inch :retval.value.dValue = 25.4; break;
|
|
case Unit::Mil :retval.value.dValue = 25.4 / 1000.0; break;
|
|
case Unit::Metric :retval.value.dValue = 1.0; break;
|
|
case Unit::Invalid :break;
|
|
}
|
|
}
|
|
else if( m_defaultUnits == Unit::Inch )
|
|
{
|
|
switch( convertFrom )
|
|
{
|
|
case Unit::Inch :retval.value.dValue = 1.0; break;
|
|
case Unit::Mil :retval.value.dValue = 1.0 / 1000.0; break;
|
|
case Unit::Metric :retval.value.dValue = 1.0 / 25.4; break;
|
|
case Unit::Invalid :break;
|
|
}
|
|
}
|
|
else if( m_defaultUnits == Unit::Mil )
|
|
{
|
|
switch( convertFrom )
|
|
{
|
|
case Unit::Inch :retval.value.dValue = 1.0 * 1000.0; break;
|
|
case Unit::Mil :retval.value.dValue = 1.0; break;
|
|
case Unit::Metric :retval.value.dValue = 1000.0 / 25.4; break;
|
|
case Unit::Invalid :break;
|
|
}
|
|
}
|
|
}
|
|
else if( isalpha( ch ))
|
|
{
|
|
// VAR
|
|
const char* cptr = &m_token.input[ m_token.pos ];
|
|
cptr++;
|
|
|
|
while( isalnum( *cptr ))
|
|
cptr++;
|
|
|
|
retval.token = VAR;
|
|
size_t bytesToCopy = cptr - &m_token.input[ m_token.pos ];
|
|
|
|
if( bytesToCopy >= sizeof( retval.value.text ))
|
|
bytesToCopy = sizeof( retval.value.text ) - 1;
|
|
|
|
strncpy( retval.value.text, &m_token.input[ m_token.pos ], bytesToCopy );
|
|
retval.value.text[ bytesToCopy ] = 0;
|
|
m_token.pos += cptr - &m_token.input[ m_token.pos ];
|
|
}
|
|
else
|
|
{
|
|
// Single char tokens
|
|
switch( ch )
|
|
{
|
|
case '+' :retval.token = PLUS; break;
|
|
case '-' :retval.token = MINUS; break;
|
|
case '*' :retval.token = MULT; break;
|
|
case '/' :retval.token = DIVIDE; break;
|
|
case '(' :retval.token = PARENL; break;
|
|
case ')' :retval.token = PARENR; break;
|
|
case '=' :retval.token = ASSIGN; break;
|
|
case ';' :retval.token = SEMCOL; break;
|
|
default :m_parseError = true; break; /* invalid character */
|
|
}
|
|
m_token.pos++;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
void NUMERIC_EVALUATOR::SetVar( const wxString& aString, double aValue )
|
|
{
|
|
m_varMap[ aString ] = aValue;
|
|
}
|
|
|
|
double NUMERIC_EVALUATOR::GetVar( const wxString& aString )
|
|
{
|
|
if( m_varMap[ aString ] )
|
|
return m_varMap[ aString ];
|
|
else
|
|
return 0.0;
|
|
}
|