altium: special string override map should be case-insensitive

This only fixes overrides where we explicitly map an override. Wrongly written variables pointing to fields are not corrected by this.

Fixes: https://gitlab.com/kicad/code/kicad/-/issues/6256

common/plugins/altium/altium_parser_utils.cpp

@@ -43,7 +43,7 @@ LIB_ID AltiumToKiCadLibID( wxString aLibName, wxString aLibReference )
 
 // https://www.altium.com/documentation/altium-designer/sch-obj-textstringtext-string-ad#!special-strings
 wxString AltiumSpecialStringsToKiCadVariables( const wxString&              aString,
-                                               const std::map<wxString, wxString>& aOverride )
+                                               const altium_override_map_t& aOverride )
 {
     if( aString.IsEmpty() || aString.at( 0 ) != '=' )
     {

common/plugins/altium/altium_parser_utils.h

@@ -30,10 +30,22 @@
 #include <kicad_string.h>
 #include <lib_id.h>
 
+#include <iostream>
+
+struct CASE_INSENSITIVE_COMPARATOR
+{
+    bool operator()( const wxString& s1, const wxString& s2 ) const
+    {
+        // Altium variables are case insensitive.
+        return s1.CmpNoCase( s2 ) < 0;
+    }
+};
+
+typedef std::map<wxString, wxString, CASE_INSENSITIVE_COMPARATOR> altium_override_map_t;
 
 LIB_ID AltiumToKiCadLibID( wxString aLibName, wxString aLibReference );
 
 wxString AltiumSpecialStringsToKiCadVariables( const wxString&              aString,
-                                               const std::map<wxString, wxString>& aOverride );
+                                               const altium_override_map_t& aOverride );
 
 #endif //ALTIUM_PARSER_UTILS_H

eeschema/sch_plugins/altium/sch_altium_plugin.cpp

@@ -2052,7 +2052,7 @@ void SCH_ALTIUM_PLUGIN::ParseParameter( const std::map<wxString, wxString>& aPro
     ASCH_PARAMETER elem( aProperties );
 
     // TODO: fill in replacements from variant, sheet and project
-    std::map<wxString, wxString> stringReplacement = {
+    altium_override_map_t stringReplacement = {
         { "Comment", "${VALUE}" },
         { "Value", "${Altium_Value}" },
     };
@@ -2102,7 +2102,7 @@ void SCH_ALTIUM_PLUGIN::ParseParameter( const std::map<wxString, wxString>& aPro
         else
         {
             int fieldIdx = component->GetFieldCount();
-            wxString fieldName = elem.name == "Value" ? "Altium_Value" : elem.name;
+            wxString fieldName = elem.name.IsSameAs( "Value", false ) ? "Altium_Value" : elem.name;
             field = component->AddField( { position, fieldIdx, component, fieldName } );
         }
 

qa/common/plugins/altium/test_altium_parser_utils.cpp

@@ -46,7 +46,7 @@ struct SPECIAL_STRINGS_TO_KICAD
 {
     wxString              input;
     wxString              exp_result;
-    std::map<wxString, wxString> override;
+    altium_override_map_t override;
 };
 
 /**
@@ -65,7 +65,6 @@ static const std::vector<SPECIAL_STRINGS_TO_KICAD> special_string_to_kicad_prope
     { "A\tB", "A\tB", {} },
     { "This is a long text with spaces", "This is a long text with spaces", {} },
     // Text format (underscore,...), TODO: add
-    // TODO: variable replacement is in fact case insensitive
     // Escaping, TODO: add
     { "+", "+", {} },
     { "'", "'", {} },
@@ -86,6 +85,16 @@ static const std::vector<SPECIAL_STRINGS_TO_KICAD> special_string_to_kicad_prope
     { "=A+B", "${A}${B}", {} },
     { "=A+B", "C${B}", { { "A", "C" } } },
     { "=A+B", "CD", { { "A", "C" }, { "B", "D" } } },
+    // Case insensitive special strings
+    { "=A", "C", { { "a", "C" } } },
+    { "=a", "C", { { "A", "C" } } },
+    { "=AB", "C", { { "Ab", "C" } } },
+    { "=AB", "C", { { "aB", "C" } } },
+    { "=AB", "C", { { "ab", "C" } } },
+    { "=AB", "C", { { "AB", "C" } } },
+    { "=aB", "C", { { "Ab", "C" } } },
+    { "=Ab", "C", { { "aB", "C" } } },
+    { "=ab", "C", { { "AB", "C" } } },
     // Special strings with text
     { "='A'", "A", {} },
     { "='This is a long text with spaces'", "This is a long text with spaces", {} },