1 files changed, 58 insertions, 0 deletions
diff --git a/py/scope.h b/py/scope.h
new file mode 100644
index 0000000000..2d620fb4fb
--- /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);