kicad/gerbview/class_am_param.cpp

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/**
* @file class_am_param.cpp
*/
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 1992-2017 Jean-Pierre Charras <jp.charras at wanadoo.fr>
* Copyright (C) 2010 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 1992-2017 KiCad Developers, see AUTHORS.txt for contributors.
*
* 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 2
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <class_am_param.h>
#include <class_aperture_macro.h>
extern int ReadInt( char*& text, bool aSkipSeparator = true );
extern double ReadDouble( char*& text, bool aSkipSeparator = true );
extern double Evaluate( AM_PARAM_EVAL_STACK& aExp );
/* Class AM_PARAM
* holds a parameter value for an "aperture macro" as defined within
* standard RS274X. The parameter can be a constant, i.e. "immediate" parameter,
* or depend on some defered values, defined in a D_CODE, by the ADD command.
* Note the actual value could need an evaluation from an arithmetical expression
* items in the expression are stored in .
* A simple definition is just a value stored in one item in m_paramStack
*/
AM_PARAM::AM_PARAM( )
{
m_index = -1;
}
/**
* Function IsImmediate
* tests if this AM_PARAM holds an immediate parameter or has parameter
* held by an owning D_CODE.
*/
bool AM_PARAM::IsImmediate() const
{
bool is_immediate = true;
for( unsigned ii = 0; ii < m_paramStack.size(); ii++ )
{
if( m_paramStack[ii].IsDefered() )
{ // a defered value is found in operand list,
// so the parameter is not immediate
is_immediate = false;
break;
}
}
return is_immediate;
}
double AM_PARAM::GetValue( const D_CODE* aDcode ) const
{
// In macros, actual values are sometimes given by an expression like:
// 0-$2/2-$4
// Because arithmetic predence is used, the parameters (values (double) and operators)
// are stored in a stack, with all numeric values converted to the actual values
// when they are defered parameters
// Each item is stored in a AM_PARAM_EVAL (a value or an operator)
//
// Then the stack with all values resolved is parsed and numeric values
// calculated according to the precedence of operators
double curr_value = 0.0;
parm_item_type op_code;
AM_PARAM_EVAL_STACK ops;
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for( unsigned ii = 0; ii < m_paramStack.size(); ii++ )
{
AM_PARAM_ITEM item = m_paramStack[ii];
switch( item.GetType() )
{
case ADD:
case SUB:
case MUL:
case DIV: // just an operator for next parameter value
case OPEN_PAR:
case CLOSE_PAR: // Priority modifiers: store in stack
op_code = item.GetType();
ops.push_back( AM_PARAM_EVAL( op_code ) );
break;
case PUSHPARM:
// a defered value: get the actual parameter from the aDcode
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if( aDcode ) // should be always true here
{
if( item.GetIndex() <= aDcode->GetParamCount() )
{
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curr_value = aDcode->GetParam( item.GetIndex() );
}
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else // Get parameter from local param definition
{
const APERTURE_MACRO * am_parent = aDcode->GetMacro();
curr_value = am_parent->GetLocalParam( aDcode, item.GetIndex() );
}
}
else
{
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wxLogDebug( wxT( "AM_PARAM::GetValue(): NULL param aDcode\n" ) );
}
ops.push_back( AM_PARAM_EVAL( curr_value ) );
break;
case PUSHVALUE: // a value is on the stack:
curr_value = item.GetValue();
ops.push_back( AM_PARAM_EVAL( curr_value ) );
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break;
default:
wxLogDebug( "AM_PARAM::GetValue(): dcode %d prm %d/%d: unexpected type %d",
aDcode ? aDcode->m_Num_Dcode : -1, ii, m_paramStack.size(), item.GetType() );
break;
}
}
double result = Evaluate( ops );
return result;
}
/**
* add an operator/operand to the current stack
* aType = NOP, PUSHVALUE, PUSHPARM, ADD, SUB, MUL, DIV, EQUATE
* aValue required only for PUSHVALUE (double) or PUSHPARM (int) aType.
*/
void AM_PARAM::PushOperator( parm_item_type aType, double aValue )
{
AM_PARAM_ITEM item( aType, aValue);
m_paramStack.push_back( item );
}
void AM_PARAM::PushOperator( parm_item_type aType, int aValue )
{
AM_PARAM_ITEM item( aType, aValue);
m_paramStack.push_back( item );
}
/**
* Function ReadParam
* Read one aperture macro parameter
* a parameter can be:
* a number
* a reference to an aperture definition parameter value: $1 ot $3 ...
* a parameter definition can be complex and have operators between numbers and/or other parameter
* like $1+3 or $2x2..
* Note minus sign is not always an operator. It can be the sign of a value.
* Parameters are separated by a comma ( of finish by *)
* @param aText = pointer to the parameter to read. Will be modified to point to the next field
* @return true if a param is read, or false
*/
bool AM_PARAM::ReadParam( char*& aText )
{
bool found = false;
int ivalue;
double dvalue;
bool end = false;
while( !end )
{
switch( *aText )
{
case ',':
aText++;
// fall through
case 0: // EOL
case '*': // Terminator in a gerber command
end = true;
break;
case ' ':
aText++;
break;
case '$':
// defered value defined later, in ADD command which define defered parameters
++aText;
ivalue = ReadInt( aText, false );
if( m_index < 1 )
SetIndex( ivalue );
PushOperator( PUSHPARM, ivalue );
found = true;
break;
case '/':
PushOperator( DIV );
aText++;
break;
case '(': // Open a block to evaluate an expression between '(' and ')'
PushOperator( OPEN_PAR );
aText++;
break;
case ')': // close a block between '(' and ')'
PushOperator( CLOSE_PAR );
aText++;
break;
case 'x':
case 'X':
PushOperator( MUL );
aText++;
break;
case '-':
case '+':
// Test if this is an operator between 2 params, or the sign of a value
if( m_paramStack.size() > 0 && !m_paramStack.back().IsOperator() )
{ // Seems an operator
PushOperator( *aText == '+' ? ADD : SUB );
aText++;
}
else
{ // seems the sign of a value
dvalue = ReadDouble( aText, false );
PushOperator( PUSHVALUE, dvalue );
found = true;
}
break;
case '=': // A local definition found like $4=$3/2
// At this point, one defered parameter is expected to be read.
// this parameter value (the index) is stored in m_index.
// The list of items is cleared
aText++;
m_paramStack.clear();
found = false;
break;
default:
dvalue = ReadDouble( aText, false );
PushOperator( PUSHVALUE, dvalue );
found = true;
break;
}
}
return found;
}