Initial commit.
diff --git a/py/scope.h b/py/scope.h
new file mode 100644
index 0000000..2d620fb
--- /dev/null
+++ b/py/scope.h
@@ -0,0 +1,58 @@
+enum {
+ ID_INFO_KIND_GLOBAL_IMPLICIT,
+ ID_INFO_KIND_GLOBAL_EXPLICIT,
+ ID_INFO_KIND_LOCAL, // in a function f, written and only referenced by f
+ ID_INFO_KIND_CELL, // in a function f, read/written by children of f
+ ID_INFO_KIND_FREE, // in a function f, belongs to the parent of f
+};
+
+typedef struct _id_info_t {
+ bool param;
+ int kind;
+ qstr qstr;
+ int local_num; // when it's an ID_INFO_KIND_LOCAL this is the unique number of the local
+} id_info_t;
+
+// taken from python source, Include/code.h
+#define SCOPE_FLAG_OPTIMISED 0x0001
+#define SCOPE_FLAG_NEWLOCALS 0x0002
+#define SCOPE_FLAG_VARARGS 0x0004
+#define SCOPE_FLAG_VARKEYWORDS 0x0008
+#define SCOPE_FLAG_NESTED 0x0010
+#define SCOPE_FLAG_GENERATOR 0x0020
+/* The SCOPE_FLAG_NOFREE flag is set if there are no free or cell variables.
+ This information is redundant, but it allows a single flag test
+ to determine whether there is any extra work to be done when the
+ call frame is setup.
+*/
+#define SCOPE_FLAG_NOFREE 0x0040
+
+// scope is a "block" in Python parlance
+typedef enum { SCOPE_MODULE, SCOPE_FUNCTION, SCOPE_LAMBDA, SCOPE_LIST_COMP, SCOPE_DICT_COMP, SCOPE_SET_COMP, SCOPE_GEN_EXPR, SCOPE_CLASS } scope_kind_t;
+typedef struct _scope_t {
+ scope_kind_t kind;
+ struct _scope_t *parent;
+ struct _scope_t *next;
+ py_parse_node_t pn;
+ qstr simple_name;
+ int id_info_alloc;
+ int id_info_len;
+ id_info_t *id_info;
+ int flags;
+ int num_params;
+ /* not needed
+ int num_default_params;
+ int num_dict_params;
+ */
+ int num_locals;
+ int stack_size;
+ int unique_code_id;
+} scope_t;
+
+scope_t *scope_new(scope_kind_t kind, py_parse_node_t pn);
+id_info_t *scope_find_or_add_id(scope_t *scope, qstr qstr, bool *added);
+id_info_t *scope_find(scope_t *scope, qstr qstr);
+id_info_t *scope_find_global(scope_t *scope, qstr qstr);
+id_info_t *scope_find_local_in_parent(scope_t *scope, qstr qstr);
+void scope_close_over_in_parents(scope_t *scope, qstr qstr);
+void scope_print_info(scope_t *s);