GNU logs - #17711, boring messages

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Subject: bug#17711: Updated "untangle" script: More functional, and resynced with 2.20
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This is a multi-part message in MIME format.
--------------020206090706050709060901
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G'day,

Here's an updated "untangle" Lua script (http://www.lua.org/),
resynchronised with the changes up until Grep 2.20
(specifically commit ...78f07b8c8e26, the post-release
administrivia commit after the release).

The original script (17 April) was fairly rough and
incomplete in places; and was overshadowed by the many
improvements being made in the lead-up to 2.19, especially
the extremely impressive work from Norihiro, Paul and Jim
at multiple levels to improve performance, documentation, and
code consistency and clarity in many areas.

I still believe that a more fundamental rework of dfa.c, based
on making the token language more expressive, is worthwhile,
but that such an invasive change could only occur if dfa.c was
made easier to modify; hence, this untangle script.

There are two major improvements over the 17 April version:

   1. The modules now clean up after themselves, instead of
      leaving dangling memory blocks.  Running "make check"
      with Valgrind, as per the script suggested by Jim in
      his 21 May message, now runs cleanly, although the
      "symlink" test hangs on my system for both the original
      and modified grep versions, for reasons that I haven't
      tried to track down.

   2. I've created a new module, "mbcsets", which models
      multibyte character class sets at arm's length to users,
      in a similar fashion to the "charclass" module.  The
      result is that the token output from fsaparse should now
      be identical to the token output from parse in dfa.c,
      whereas previously the comparison could only be made at
      the output of fsalex, as it did not share its
      internally-build mbcsets structures.

There's quite a number of implementation differences that are
worth inspecting in the untangled versions:

   1. Charclass has moved from persistent class indices, but
      changing class pointers (due to realloc ()), to also
      explicitly supporting persistent pointers.  This has
      facilitated better charclass caching in various places;

   2. I'm still working towards a scenario where multiple
      lexers/parsers/etc could co-exist in different-locale
      and/or different-regex-option versions, with the locale
      captured when fsalex_syntax () is called by the client,
      and all other users rigorously obtain locale information
      directly or indirectly via the lexer.  This is incomplete;
      one example that I haven't fixed yet is the using_utf8 ()
      test in fsaparse;

   3. find_pred (), in fsalex, exploits the charclass pointer
      guarantee to do lazy caching of predicate searches;

   4. The treatment of \s and \S in fsalex_lex () has been
      rewritten to not use PUSH_LEX_STATE/POP_LEX_STATE, as it
      calls underlying resources such as find_pred directly.
      (Incidentally, the IS_WORD_CONSTITUENT implementation of
      \w/\W in dfa.c is quite different to the \s/\S treatment
      in the original dfa.c:  Is this code correct in a
      multibyte environment?);

   5. I reworked FETCH_WC/FETCH_CHAR only a few days before Paul
      and Norihiro mad extensive improvements;  I've tried to
      integrate their changes into my version without compromising
      their excellent work; my version is sufficiently different,
      in documentation even if nowhere else, to be worth a look;
      and

   6. My personal coding preference is to not guarantee
      single-exit functions, but instead, try to treat exceptional
      and/or simple cases early in the function, with an
      immediate function return.  My hope is that this makes the
      remainder of the function easier to understand, as the
      reader knows that certain cases have been eliminated.

      In this vein, I (possibly rashly) decided to rewrite
      atom () and closure () in fsaparse; all feedback on this
      effort is welcome.

As before, the code modifies dfa.c to create "dfa-prl.c", so
that the original code and the new code can be run in "parallel",
and the outputs compared.  The comparison is logged in
/tmp/parallel.log.  The co-existence of new and old code means
that the new code has to have explicit module name prefixes in
many places, at least to avoid namespace clashes.

This message contains the updated "untangle" Lua script, along
with the "strictness" module, from LuaRocks, that I use to
stop global variables (usually the result of typos) from being
created freely.

I'll post a follow-up message shortly, with the full set of
created and/or modified files created by the script, for those
that (probably quite wisely) may distrust Lua scripts from
strangers.

cheers,

behoffski (Brenton Hoff)
Programmer, Grouse Software

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ZW5kCg==
--------------020206090706050709060901
Content-Type: text/x-lua;
 name="strictness.lua"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="strictness.lua"

-- ================================================================
-- "strictness" tracks declaration and assignment of globals in Lua
-- Copyright (c) 2013 Roland Y., MIT License
-- v0.1.0 - compatible Lua 5.1, 5.2
-- ================================================================

local setmetatable = setmetatable
local getmetatable = getmetatable
local type = type
local rawget = rawget
local rawset = rawset
local unpack = unpack
local error = error
local getfenv = getfenv

-- ===================
-- Private helpers
-- ===================

-- Lua reserved keywords
local luaKeyword = {
  ['and'] = true,     ['break'] = true,   ['do'] = true,
  ['else'] = true,    ['elseif'] = true,  ['end'] = true ,
  ['false'] = true,   ['for'] = true,     ['function'] = true,
  ['if'] = true,      ['in'] = true,      ['local'] = true ,
  ['nil'] = true,     ['not'] = true ,    ['or'] = true,
  ['repeat'] = true,  ['return'] = true,  ['then'] = true ,
  ['true'] = true ,   ['until'] = true ,  ['while'] = true,
}

-- Register for declared globals, defined as a table
-- with weak values.
local declared_globals = setmetatable({},{__mode = 'v'})

-- The global env _G metatable
local _G_mt

-- A custom error function
local function err(msg, level)  return error(msg, level or 3) end

-- Custom assert with error level depth
local function assert(cond, msg, level)
  if not cond then
    return err(msg, level or 4)
  end
end

-- Custom argument type assertion helper
local function assert_type(var, expected_type, argn, level)
  local var_type = type(var)
  assert(var_type == expected_type,
    ('Bad argument #%d to global (%s expected, got %s)')
      :format(argn or 1, expected_type, var_type), level)
end

-- Checks in the register if the given global was declared
local function is_declared(varname)
  return declared_globals[varname]
end

-- Checks if the passed-in string can be a valid Lua identifier
local function is_valid_identifier(iden)
  return iden:match('^[%a_]+[%w_]*$') and not luaKeyword[iden]
end

-- ==========================
-- Module functions
-- ==========================

-- Allows the declaration of passed in varnames
local function declare_global(...)
  local vars = {...}
  assert(#vars > 0,
    'bad argument #1 to global (expected strings, got nil)')
  for i,varname in ipairs({...}) do
    assert_type(varname, 'string',i, 5)
    assert(is_valid_identifier(varname),
      ('bad argument #%d to global. "%s" is not a valid Lua identifier')
        :format(i, varname))
    declared_globals[varname] = true
  end
end

-- Allows the given function to write globals
local function declare_global_func(f)
  assert_type(f, 'function', nil, 5)
  return function(...)
    local old_index, old_newindex = _G_mt.__index, _G_mt.__newindex
    _G_mt.__index, _G_mt.__newindex = nil, nil
    local results = {f(...)}
    _G_mt.__index, _G_mt.__newindex = old_index, old_newindex
    return unpack(results)
  end
end

-- ==========================
-- Locking the global env _G
-- ==========================

do

  -- Catches the current env
  local ENV = _VERSION:match('5.2') and _G or getfenv()
  
  -- Preserves a possible existing metatable for the current env
  _G_mt = getmetatable(ENV)
  if not _G_mt then
    _G_mt = {}
    setmetatable(ENV,_G_mt)
  end

  -- Locks access to undeclared globals
  _G_mt.__index = function(env, varname)
    if not is_declared(varname) then
      err(('Attempt to read undeclared global variable "%s"')
        :format(varname))
    end
    return rawget(env, varname)
  end

  -- Locks assignment of undeclared globals
  _G_mt.__newindex = function(env, varname, value)
    if not is_declared(varname) then
      err(('Attempt to assign undeclared global variable "%s"')
        :format(varname))
    end
    rawset(env, varname, value)
  end
  
  rawset(ENV, 'global', declare_global)
  rawset(ENV, 'globalize', declare_global_func)

end
--------------020206090706050709060901--

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: behoffski <behoffski@HIDDEN>
Subject: bug#17711: Acknowledgement (Updated "untangle" script: More
 functional, and resynced with 2.20)
Message-ID: <handler.17711.B.140202678113535.ack <at> debbugs.gnu.org>
References: <53913AB8.50301@HIDDEN>
X-Gnu-PR-Message: ack 17711
X-Gnu-PR-Package: grep
Reply-To: 17711 <at> debbugs.gnu.org
Date: Fri, 06 Jun 2014 03:53:03 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

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If you wish to submit further information on this problem, please
send it to 17711 <at> debbugs.gnu.org.

Please do not send mail to help-debbugs@HIDDEN unless you wish
to report a problem with the Bug-tracking system.

--=20
17711: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D17711
GNU Bug Tracking System
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severity 17712 wishlist
severity 17711 wishlist