From cfdb9907cb87d15eaab72ceefbfa42fd7a4c3127 Mon Sep 17 00:00:00 2001
From: Josh Haberman <haberman@google.com>
Date: Sat, 11 May 2013 16:45:38 -0700
Subject: Synced with 3 months of Google-internal development.

Major changes:
- Got rid of all bytestream interfaces in favor of
  using regular handlers.
- new Pipeline object represents a upb pipeline, does
  bump allocation internally to manage memory.
- proto2 support now can handle extensions.
---
 upb/descriptor/reader.h | 106 ++++++++++++++++++++++--------------------------
 1 file changed, 49 insertions(+), 57 deletions(-)

(limited to 'upb/descriptor/reader.h')

diff --git a/upb/descriptor/reader.h b/upb/descriptor/reader.h
index 4312682..87f5f86 100644
--- a/upb/descriptor/reader.h
+++ b/upb/descriptor/reader.h
@@ -4,9 +4,8 @@
  * Copyright (c) 2011 Google Inc.  See LICENSE for details.
  * Author: Josh Haberman <jhaberman@gmail.com>
  *
- * upb_descreader provides a set of sink handlers that will build defs from a
- * data source that uses the descriptor.proto schema (like a protobuf binary
- * descriptor).
+ * upb::descriptor::Reader provides a way of building upb::Defs from
+ * data in descriptor.proto format.
  */
 
 #ifndef UPB_DESCRIPTOR_H
@@ -15,69 +14,62 @@
 #include "upb/handlers.h"
 
 #ifdef __cplusplus
-extern "C" {
-#endif
+namespace upb {
+namespace descriptor {
 
-/* upb_deflist ****************************************************************/
-
-// upb_deflist is an internal-only dynamic array for storing a growing list of
-// upb_defs.
-typedef struct {
-  upb_def **defs;
-  size_t len;
-  size_t size;
-  bool owned;
-} upb_deflist;
-
-void upb_deflist_init(upb_deflist *l);
-void upb_deflist_uninit(upb_deflist *l);
-void upb_deflist_push(upb_deflist *l, upb_def *d);
-
-/* upb_descreader  ************************************************************/
-
-// We keep a stack of all the messages scopes we are currently in, as well as
-// the top-level file scope.  This is necessary to correctly qualify the
-// definitions that are contained inside.  "name" tracks the name of the
-// message or package (a bare name -- not qualified by any enclosing scopes).
-typedef struct {
-  char *name;
-  // Index of the first def that is under this scope.  For msgdefs, the
-  // msgdef itself is at start-1.
-  int start;
-} upb_descreader_frame;
-
-typedef struct {
-  upb_deflist defs;
-  upb_descreader_frame stack[UPB_MAX_TYPE_DEPTH];
-  int stack_len;
-  upb_status status;
-
-  uint32_t number;
-  char *name;
-  bool saw_number;
-  bool saw_name;
-
-  char *default_string;
-
-  upb_fielddef *f;
-} upb_descreader;
-
-void upb_descreader_init(upb_descreader *r);
-void upb_descreader_uninit(upb_descreader *r);
-
-// Registers handlers that will build the defs.  Pass the descreader as the
-// closure.
-const upb_handlers *upb_descreader_newhandlers(const void *owner);
+// Frame type that accumulates defs as they are being built from a descriptor
+// according to the descriptor.proto schema.
+class Reader;
 
 // Gets the array of defs that have been parsed and removes them from the
 // descreader.  Ownership of the defs is passed to the caller using the given
 // owner), but the ownership of the returned array is retained and is
 // invalidated by any other call into the descreader.  The defs will not have
 // been resolved, and are ready to be added to a symtab.
+inline upb::Def** GetDefs(Reader* r, void* owner, int* n);
+
+// Gets the handlers for reading a FileDescriptorSet, which builds defs and
+// accumulates them in a Reader object (which the handlers use as their
+// FrameType).
+inline const upb::Handlers* GetReaderHandlers(const void* owner);
+
+}  // namespace descriptor
+}  // namespace upb
+
+typedef upb::descriptor::Reader upb_descreader;
+
+extern "C" {
+#else
+struct upb_descreader;
+typedef struct upb_descreader upb_descreader;
+#endif
+
+// C API.
+const upb_frametype *upb_descreader_getframetype();
 upb_def **upb_descreader_getdefs(upb_descreader *r, void *owner, int *n);
+const upb_handlers *upb_descreader_gethandlers(const void *owner);
+
+
+// C++ implementation details. /////////////////////////////////////////////////
 
 #ifdef __cplusplus
-}  /* extern "C" */
+}  // extern "C"
+
+namespace upb {
+
+template<> inline const FrameType* GetFrameType<upb::descriptor::Reader>() {
+  return upb_descreader_getframetype();
+}
+
+namespace descriptor {
+inline upb::Def** GetDefs(Reader* r, void* owner, int* n) {
+  return upb_descreader_getdefs(r, owner, n);
+}
+inline const upb::Handlers* GetReaderHandlers(const void* owner) {
+  return upb_descreader_gethandlers(owner);
+}
+}  // namespace descriptor
+}  // namespace upb
 #endif
 
-#endif
+#endif  // UPB_DESCRIPTOR_H
-- 
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