drc_rule_condition.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 KiCad Developers, see change_log.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 <board_item.h>
#include <reporter.h>
#include <drc/drc_rule_condition.h>
#include <pcb_expr_evaluator.h>


DRC_RULE_CONDITION::DRC_RULE_CONDITION( const wxString& aExpression ) :
    m_expression( aExpression ),
    m_ucode ( nullptr )
{
}


DRC_RULE_CONDITION::~DRC_RULE_CONDITION()
{
}


bool DRC_RULE_CONDITION::EvaluateFor( const BOARD_ITEM* aItemA, const BOARD_ITEM* aItemB,
                                      PCB_LAYER_ID aLayer, REPORTER* aReporter )
{
    if( GetExpression().IsEmpty() )
        return true;

    if( !m_ucode )
    {
        if( aReporter )
            aReporter->Report( _( "ERROR in expression." ) );

        return false;
    }

    PCB_EXPR_CONTEXT ctx( aLayer );
    ctx.SetErrorCallback(
            [&]( const wxString& aMessage, int aOffset )
            {
                if( aReporter )
                    aReporter->Report( _( "ERROR:" ) + wxS( " " )+ aMessage );
            } );

    BOARD_ITEM* a = const_cast<BOARD_ITEM*>( aItemA );
    BOARD_ITEM* b = const_cast<BOARD_ITEM*>( aItemB );

    ctx.SetItems( a, b );

    if( m_ucode->Run( &ctx )->AsDouble() != 0.0 )
    {
        return true;
    }
    else if( aItemB )   // Conditions are commutative
    {
        ctx.SetItems( b, a );

        if( m_ucode->Run( &ctx )->AsDouble() != 0.0 )
            return true;
    }

    return false;
}


bool DRC_RULE_CONDITION::Compile( REPORTER* aReporter, int aSourceLine, int aSourceOffset )
{
    PCB_EXPR_COMPILER compiler;

    compiler.SetErrorCallback(
            [&]( const wxString& aMessage, int aOffset )
            {
                if( aReporter )
                {
                    wxString rest;
                    wxString first = aMessage.BeforeFirst( '|', &rest );
                    wxString msg = wxString::Format( _( "ERROR: <a href='%d:%d'>%s</a>%s" ),
                                                     aSourceLine,
                                                     aSourceOffset + aOffset,
                                                     first,
                                                     rest );

                    aReporter->Report( msg, RPT_SEVERITY_ERROR );
                }
            } );

    m_ucode = std::make_unique<PCB_EXPR_UCODE>();

    PCB_EXPR_CONTEXT preflightContext( F_Cu );

    bool ok = compiler.Compile( GetExpression().ToUTF8().data(), m_ucode.get(), &preflightContext );
    return ok;
}