Re: Re: software design clarification

"Roman Yakovenko" <[email protected]> Tue, 8 May 2007 23:05:23 +0300
Newsgroups gmane.comp.documentation.synopsis
Message-ID <[email protected]> 
On 5/8/07, Stefan Seefeld <[email protected]> wrote:
> Understood. Taking this very high-level description, I would express it
> like this in Synopsis:
>
> A code-translating processor takes an AST (or similar) as input, and
> generates some new AST as output. A formatting processor then traverses
> the newly generated AST, 'formatting' it into actual code.
>
> The first processor would need to understand the code mapping, i.e.
> understand the boost.python logic, the wrapping, call policies, etc.,
> and the second processor would encapsulate formatting constraints, i.e.
> how the generated code should be laid out, partitioned into files, etc.
>
> The two processors would be customizable (to differing degrees; for some
> aspects a simple parameter is enough, for some you may want to encapsulate
> subtasks into classes that can be overridden by users).

Basically you are right.

> >> The reason I ask is because I can see yet a different interaction between
> >> Synopsis and Py++ (and GCCXML, for that matter):
> >
> > I am curious - what do you mean?
>
> * The Synopsis pipeline API is what is exposed to users, who then select
>   and customize Py++ code-generating processors, much as they now select
>   processors to customize documentation extraction and formatting.
>
> * Py++ merely uses the Synopsis C++ parser, but without using the pipeline
>   approach.
>
> * Synopsis uses alternate C++ parsers (such as GCCXML or Elsa) internally,
>   and Py++ accesses them through the pipeline API as in the first use case.

I have a very different vision of the solution :-).

> >> What if Py++ itself used Synopsis' pipeline language (and thus,
> >> scripting frontend),
> >> to drive the introspection as well as the code generation ?
> >
> > Good C++ parser is critical for s-2-s translators, but this is not enough.
> > pygccxml contains type traits - the functionality very similar to
> > boost::type_traits.
> > It is a must.
>
> I'm not sure what you are saying. Type analysis is part of a real C++ parser.
> Are you saying type inspection needs to be accessible through the intermediate
> representation(s) ? I fully agree. (And in fact the AST does provide some
> information about types, though this is clearly something that needs to be worked
> on.)

Providing information about types and types them self is not enough.
The framework should also provide functions, which make easier to
analyze types. For example pygccxml has next functions:

is_convertible( source, target )
is_integral( some_type )

Thus the code of s-2-s translator is much smaller and more readable.
You can see the full list of functions and source code here:

http://language-binding.net/pygccxml/apidocs/pygccxml.declarations.type_traits-module.html

> > This is the subject I am working right now. I am constructing
> > declarations tree ( AST ) from Synopsis and GCC-XML. From my
> > experience till now, the trees are very very different. GCCXML
> > provides much more information.
>
> Can you elaborate ? I don't doubt what you are saying, I merely
> hope that a concrete list of metadata may help us complete the
> Synopsis AST. (Since the existing type analysis is rather rudimentary,
> most metadata gets stored as strings, e.g. 'premodifiers', 'postmodifiers'),
> so it's impossible to do a true query like 'is this a const member ?'

I attached few files: source code, information generated by gccxml and synposis.
Even if you say that enumerators has all relevant information the
trees are still diffrent:
* Synopsis doesn't have "::" global namespace ( module )
* All built-ins are missing - in my case this is not important, but
still should be noted.

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/

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declarations_enums.hpp (text/x-c++hdr, 479 B) 
// Copyright 2004 Roman Yakovenko.
// 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)

#ifndef __declarations_enums_hpp__
#define __declarations_enums_hpp__

namespace declarations{ namespace enums{

enum ENumbers{ e0, e1, e2, e3, e4, e5, e6, e7, e8, e9 };

class data{
public:
    enum EColor{ red, green, blue, black, white };
};

} }

#endif//__declarations_enums_hpp__
synopsis_ast.txt (text/plain, 389 B) 
>python -u "synopsis_reader.py"
file  declarations_enums.hpp
 ('__declarations_enums_hpp__',) Macro
 ('declarations',) Module
  ('declarations', 'enums') Module
   ('declarations', 'enums', 'ENumbers') Enum
   ('declarations', 'enums', 'data') Class
    ('declarations', 'enums', 'data', 'EColor') Enum
    ('EOS',) Builtin
   ('EOS',) Builtin
  ('EOS',) Builtin
>Exit code: 0
gccxml_ast.txt (text/plain, 30.5 KB) 
<?xml version="1.0"?>
<GCC_XML cvs_revision="1.114">
  <Namespace id="_1" name="::" members="_3 _4 _5 _6 _7 _8 _9 _10 _11 _12 _13 _14 _15 _16 _17 _18 _19 _20 _21 _22 _23 _24 _25 _26 _27 _28 _29 _30 _31 _32 _33 _34 _35 _36 _37 _38 _39 _40 _41 _42 _43 _44 _45 _46 _47 _48 _49 _50 _51 _52 _53 _54 _55 _56 _57 _58 _59 _60 _61 _62 _63 _64 _65 _66 _67 _68 _69 _70 _71 _72 _73 _74 _75 _76 _77 _78 _79 _80 _81 _82 _83 _84 _85 _86 _87 _88 _89 _90 _91 _92 _93 _94 _95 _96 _97 _98 _99 _100 _101 _102 _103 _104 _105 _106 _107 _108 _109 _110 _111 _112 _113 _114 _115 _116 _117 _118 _119 _120 _121 _122 " mangled="_Z2::" demangled="::"/>
  <Namespace id="_2" name="std" context="_1" members="" mangled="_Z3std" demangled="std"/>
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