1 files changed, 141 insertions, 0 deletions
diff --git a/class.c b/class.c
new file mode 100644
index 0000000..ff4ec56
--- /dev/null
+++ b/class.c
@@ -0,0 +1,141 @@
+/* Copyright Vladimir Prus 2003. Distributed under the Boost */
+/* Software License, Version 1.0. (See accompanying */
+/* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) */
+
+#include "class.h"
+#include "strings.h"
+#include "variable.h"
+#include "frames.h"
+#include "rules.h"
+#include "newstr.h"
+
+#include "hash.h"
+
+
+static struct hash * classes = 0;
+
+
+static void check_defined( LIST * class_names )
+{
+    for ( ; class_names; class_names = class_names->next )
+    {
+        char * * p = &class_names->string;
+        if ( !hashcheck( classes, (HASHDATA * *)&p ) )
+        {
+            printf( "Class %s is not defined\n", class_names->string );
+            abort();
+        }
+    }
+}
+
+
+static char * class_module_name( char * declared_name )
+{
+    string name[ 1 ];
+    char * result;
+
+    string_new( name );
+    string_append( name, "class@" );
+    string_append( name, declared_name );
+
+    result = newstr( name->value );
+    string_free( name );
+
+    return result;
+}
+
+
+struct import_base_data
+{
+    char     * base_name;
+    module_t * base_module;
+    module_t * class_module;
+};
+
+
+static void import_base_rule( void * r_, void * d_ )
+{
+    RULE * r = (RULE *)r_;
+    RULE * ir1;
+    RULE * ir2;
+    struct import_base_data * d = (struct import_base_data *)d_;
+    string qualified_name[ 1 ];
+
+    string_new      ( qualified_name               );
+    string_append   ( qualified_name, d->base_name );
+    string_push_back( qualified_name, '.'          );
+    string_append   ( qualified_name, r->name      );
+
+    ir1 = import_rule( r, d->class_module, r->name );
+    ir2 = import_rule( r, d->class_module, qualified_name->value );
+
+    /* Copy 'exported' flag. */
+    ir1->exported = ir2->exported = r->exported;
+
+    /* If we are importing a class method, localize it. */
+    if ( ( r->module == d->base_module ) || ( r->module->class_module &&
+        ( r->module->class_module == d->base_module ) ) )
+        ir1->module = ir2->module = d->class_module;
+
+    string_free( qualified_name );
+}
+
+
+/*
+ * For each exported rule 'n', declared in class module for base, imports that
+ * rule in 'class' as 'n' and as 'base.n'. Imported rules are localized and
+ * marked as exported.
+ */
+
+static void import_base_rules( module_t * class, char * base )
+{
+    module_t * base_module = bindmodule( class_module_name( base ) );
+    struct import_base_data d;
+    d.base_name = base;
+    d.base_module = base_module;
+    d.class_module = class;
+
+    if ( base_module->rules )
+        hashenumerate( base_module->rules, import_base_rule, &d );
+
+    import_module( imported_modules( base_module ), class );
+}
+
+
+char * make_class_module( LIST * xname, LIST * bases, FRAME * frame )
+{
+    char       * name = class_module_name( xname->string );
+    char     * * pp = &xname->string;
+    module_t   * class_module = 0;
+    module_t   * outer_module = frame->module;
+
+    if ( !classes )
+        classes = hashinit( sizeof( char * ), "classes" );
+
+    if ( hashcheck( classes, (HASHDATA * *)&pp ) )
+    {
+        printf( "Class %s already defined\n", xname->string );
+        abort();
+    }
+    else
+    {
+        hashenter( classes, (HASHDATA * *)&pp );
+    }
+    check_defined( bases );
+
+    class_module = bindmodule( name );
+
+    exit_module( outer_module );
+    enter_module( class_module );
+
+    var_set( "__name__", xname, VAR_SET );
+    var_set( "__bases__", bases, VAR_SET );
+
+    exit_module( class_module );
+    enter_module( outer_module );
+
+    for ( ; bases; bases = bases->next )
+        import_base_rules( class_module, bases->string );
+
+    return name;
+}