Handle backslash-escaped quotes in libeval.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/15786

common/libeval_compiler/libeval_compiler.cpp

@@ -201,6 +201,24 @@ wxString UCODE::Dump() const
 };
 
 
+wxString TOKENIZER::GetString()
+{
+    wxString rv;
+
+    while( m_pos < m_str.length() && m_str[ m_pos ] != '\'' )
+    {
+        if( m_str[ m_pos ] == '\\' && m_pos + 1 < m_str.length() && m_str[ m_pos + 1 ] == '\'' )
+            m_pos++;
+
+        rv.append( 1, m_str[ m_pos++ ] );
+    }
+
+    m_pos++;
+
+    return rv;
+}
+
+
 wxString TOKENIZER::GetChars( const std::function<bool( wxUniChar )>& cond ) const
 {
     wxString rv;
@@ -383,12 +401,9 @@ T_TOKEN COMPILER::getToken()
 
 bool COMPILER::lexString( T_TOKEN& aToken )
 {
-    wxString str = m_tokenizer.GetChars( []( int c ) -> bool { return c != '\''; } );
-
     aToken.token = G_STRING;
-    aToken.value.str = new wxString( str );
+    aToken.value.str = new wxString( m_tokenizer.GetString() );
 
-    m_tokenizer.NextChar( str.length() + 1 );
     m_lexerState = LS_DEFAULT;
     return true;
 }

include/libeval_compiler/libeval_compiler.h

@@ -474,6 +474,8 @@ public:
         return m_pos;
     }
 
+    wxString GetString();
+
     wxString GetChars( const std::function<bool( wxUniChar )>& cond ) const;
 
     bool MatchAhead( const wxString& match,

pcbnew/drc/drc_engine.cpp

@@ -229,13 +229,21 @@ void DRC_ENGINE::loadImplicitRules()
     auto makeNetclassRules =
             [&]( const std::shared_ptr<NETCLASS>& nc, bool isDefault )
             {
-                wxString ncName = nc->GetName();
-                wxString expr;
+                wxString  ncName = nc->GetName();
+                wxString  friendlyName;
+                wxString* shownName = &ncName;
+                wxString  expr;
+
+                if( ncName.Replace( "'", "\\'" ) )
+                {
+                    friendlyName = nc->GetName();
+                    shownName = &friendlyName;
+                }
 
                 if( nc->GetClearance() || nc->GetTrackWidth() )
                 {
                     std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
-                    netclassRule->m_Name = wxString::Format( _( "netclass '%s'" ), ncName );
+                    netclassRule->m_Name = wxString::Format( _( "netclass '%s'" ), *shownName );
                     netclassRule->m_Implicit = true;
 
                     expr = wxString::Format( wxT( "A.NetClass == '%s'" ), ncName );
@@ -262,7 +270,7 @@ void DRC_ENGINE::loadImplicitRules()
                 {
                     std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
                     netclassRule->m_Name = wxString::Format( _( "netclass '%s' (diff pair)" ),
-                                                             ncName );
+                                                             *shownName );
                     netclassRule->m_Implicit = true;
 
                     expr = wxString::Format( wxT( "A.NetClass == '%s' && A.inDiffPair('*')" ),
@@ -280,7 +288,7 @@ void DRC_ENGINE::loadImplicitRules()
                 {
                     std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
                     netclassRule->m_Name = wxString::Format( _( "netclass '%s' (diff pair)" ),
-                                                             ncName );
+                                                             *shownName );
                     netclassRule->m_Implicit = true;
 
                     expr = wxString::Format( wxT( "A.NetClass == '%s'" ), ncName );
@@ -297,7 +305,7 @@ void DRC_ENGINE::loadImplicitRules()
                     {
                         netclassRule = std::make_shared<DRC_RULE>();
                         netclassRule->m_Name = wxString::Format( _( "netclass '%s' (diff pair)" ),
-                                                                 ncName );
+                                                                 *shownName );
                         netclassRule->m_Implicit = true;
 
                         expr = wxString::Format( wxT( "A.NetClass == '%s' && AB.isCoupledDiffPair()" ),
@@ -314,7 +322,7 @@ void DRC_ENGINE::loadImplicitRules()
                 if( nc->GetViaDiameter() || nc->GetViaDrill() )
                 {
                     std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
-                    netclassRule->m_Name = wxString::Format( _( "netclass '%s'" ), ncName );
+                    netclassRule->m_Name = wxString::Format( _( "netclass '%s'" ), *shownName );
                     netclassRule->m_Implicit = true;
 
                     expr = wxString::Format( wxT( "A.NetClass == '%s' && A.Via_Type != 'Micro'" ),
@@ -342,7 +350,8 @@ void DRC_ENGINE::loadImplicitRules()
                 if( nc->GetuViaDiameter() || nc->GetuViaDrill() )
                 {
                     std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
-                    netclassRule->m_Name = wxString::Format( _( "netclass '%s' (uvia)" ), ncName );
+                    netclassRule->m_Name = wxString::Format( _( "netclass '%s' (uvia)" ),
+                                                             *shownName );
                     netclassRule->m_Implicit = true;
 
                     expr = wxString::Format( wxT( "A.NetClass == '%s' && A.Via_Type == 'Micro'" ),