Paul Eggert <eggert@HIDDEN>
to control <at> debbugs.gnu.org.
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Date: Fri, 06 Jun 2014 13:21:20 +0930
From: behoffski <behoffski@HIDDEN>
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Subject: Updated "untangle" script: More functional, and resynced with 2.20
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--------------020206090706050709060901
Content-Type: text/plain; charset=UTF-8; format=flowed
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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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--------------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--
behoffski <behoffski@HIDDEN>:bug-grep@HIDDEN.
Full text available.bug-grep@HIDDEN:bug#17711; Package grep.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.