From 63f01edc8b8f09f07fcc331f92242bbca1db40b7 Mon Sep 17 00:00:00 2001
From: Sergey Matveev <stargrave@stargrave.org>
Date: Mon, 6 Nov 2017 11:32:43 +0300
Subject: [PATCH] Move generic decoder scheme and pretty printer out of main

That allows generic decoder use in libraries.
---
 doc/news.rst |  7 +++++
 pyderasn.py  | 81 +++++++++++++++++++++++++++-------------------------
 2 files changed, 49 insertions(+), 39 deletions(-)

diff --git a/doc/news.rst b/doc/news.rst
index bd71b82..24cec4e 100644
--- a/doc/news.rst
+++ b/doc/news.rst
@@ -1,6 +1,13 @@
 News
 ====
 
+.. _release1.5:
+
+1.5
+---
+* Generic decoder's scheme and pretty printer
+  (:py:func:`pyderasn.generic_decoder`) can be used in libraries.
+
 .. _release1.4:
 
 1.4
diff --git a/pyderasn.py b/pyderasn.py
index 56eec8d..717c06c 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -4282,6 +4282,47 @@ def obj_by_path(pypath):  # pragma: no cover
     return obj
 
 
+def generic_decoder():  # pragma: no cover
+    # All of this below is a big hack with self references
+    choice = PrimitiveTypes()
+    choice.specs["SequenceOf"] = SequenceOf(schema=choice)
+    choice.specs["SetOf"] = SetOf(schema=choice)
+    for i in range(31):
+        choice.specs["SequenceOf%d" % i] = SequenceOf(
+            schema=choice,
+            expl=tag_ctxc(i),
+        )
+    choice.specs["Any"] = Any()
+
+    # Class name equals to type name, to omit it from output
+    class SEQUENCEOF(SequenceOf):
+        __slots__ = ()
+        schema = choice
+
+    def pprint_any(obj, oids=None):
+        def _pprint_pps(pps):
+            for pp in pps:
+                if hasattr(pp, "_fields"):
+                    if pp.asn1_type_name == Choice.asn1_type_name:
+                        continue
+                    pp_kwargs = pp._asdict()
+                    pp_kwargs["decode_path"] = pp.decode_path[:-1] + (">",)
+                    pp = _pp(**pp_kwargs)
+                    yield pp_console_row(
+                        pp,
+                        oids=oids,
+                        with_offsets=True,
+                        with_blob=False,
+                    )
+                    for row in pp_console_blob(pp):
+                        yield row
+                else:
+                    for row in _pprint_pps(pp):
+                        yield row
+        return "\n".join(_pprint_pps(obj.pps()))
+    return SEQUENCEOF(), pprint_any
+
+
 def main():  # pragma: no cover
     import argparse
     parser = argparse.ArgumentParser(description="PyDERASN ASN.1 DER decoder")
@@ -4307,45 +4348,7 @@ def main():  # pragma: no cover
         from functools import partial
         pprinter = partial(pprint, big_blobs=True)
     else:
-        # All of this below is a big hack with self references
-        choice = PrimitiveTypes()
-        choice.specs["SequenceOf"] = SequenceOf(schema=choice)
-        choice.specs["SetOf"] = SetOf(schema=choice)
-        for i in range(31):
-            choice.specs["SequenceOf%d" % i] = SequenceOf(
-                schema=choice,
-                expl=tag_ctxc(i),
-            )
-        choice.specs["Any"] = Any()
-
-        # Class name equals to type name, to omit it from output
-        class SEQUENCEOF(SequenceOf):
-            __slots__ = ()
-            schema = choice
-        schema = SEQUENCEOF()
-
-        def pprint_any(obj, oids=None):
-            def _pprint_pps(pps):
-                for pp in pps:
-                    if hasattr(pp, "_fields"):
-                        if pp.asn1_type_name == Choice.asn1_type_name:
-                            continue
-                        pp_kwargs = pp._asdict()
-                        pp_kwargs["decode_path"] = pp.decode_path[:-1] + (">",)
-                        pp = _pp(**pp_kwargs)
-                        yield pp_console_row(
-                            pp,
-                            oids=oids,
-                            with_offsets=True,
-                            with_blob=False,
-                        )
-                        for row in pp_console_blob(pp):
-                            yield row
-                    else:
-                        for row in _pprint_pps(pp):
-                            yield row
-            return "\n".join(_pprint_pps(obj.pps()))
-        pprinter = pprint_any
+        schema, pprinter = generic_decoder()
     obj, tail = schema().decode(der)
     print(pprinter(obj, oids=oids))
     if tail != b"":
-- 
2.44.0