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