Re: [NTG-context] lua tables - how do you cope?

[Hans Hagen]

On 7/30/2016 3:04 PM, Joseph Canedo wrote:

If the requirement is to iterate on a table having the keys, values
sorted by key (assuming the keys can be sorted), there are ways to do
this. Please see http://lua-users.org/wiki/SortedIteration for an
example (this just replaces pairs(t) with orderedPairs(t)).


or just in context

for k, v in table.sortedhash(t)
  print(k,v)
end

btw,

mtxrun --script foo.lua

has all that on board as well




Hope this helps



Joseph



*De : *Schmitz Thomas A. <mailto:thomas.schm...@uni-bonn.de>
*Envoyé le :*samedi 30 juillet 2016 12:21
*À : *mailing list for ConTeXt users <mailto:ntg-context@ntg.nl>
*Objet :*[NTG-context] lua tables - how do you cope?



This is less a specific question about ConTeXt than a hope for good
advice: I’m maltreating my xml files with a mixture of TeX and Lua. I
want to extract and typeset information in different forms, so I first
collect everything in lua tables, rearrange and order these tables and
typeset the results. All fine and dandy. My problem is that I have to
have tables within tables within tables… you get the picture. One aspect
of Lua that is really bugging me is the fact that associative tables
have no order, which can be a pain in the butt for this kind of
operation. So I have to be careful that I have to use constructs that
will keep the order in which items have been added and loop through them
via ipairs() instead of pairs(). I find it difficult to keep track of
what’s inside my layers upon layers of tables. So my question is: how do
those of you who are more experienced with this kind of question
proceed? Do you have any handy tool to visualize a table? Any tips you
want to share?



Thanks a lot!



Thomas

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Re: [NTG-context] lua tables - how do you cope?

[Hans Hagen]

On 7/30/2016 11:01 PM, Schmitz Thomas A. wrote:

Thank you, but this is not what I’m looking for. I know how to sort a table, and I 
know the Lua table tutorial (the Lua wiki is, IMHO, really terrible and 
disorganized). I have to construct deeply nested tables and sometimes lose track of 
what is at what level of my table, so I was wondering if there was an easy way of 
visualizing a nested table. On the web, you can find a number of (mostly abandoned) 
projects; the one at http://siffiejoe.github.io/lua-microscope/ says: "Many Lua 
programmers have written their own pretty-printer or data dumper and some even use 
it for (de-)serializing Lua data structures.” So I was wondering if any of the Lua 
users here on the list has something they want to share.


\startluacode
context.tocontext(yourtable)
\stopluaxcode

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   tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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Re: [NTG-context] lua tables - how do you cope?

[Schmitz Thomas A.]

> On 30 Jul 2016, at 23:46, Lukas Prochazka  wrote:
> 
> Hello Thomas,
> 
> here is my "dump()" I've been using for several years:

Arthur, Lukas,

these are both great and very helpful, thanks a lot! I feel bad for not knowing 
table.serialize (which can even be used with the context() function to typeset 
the result, and I really like Lukas’ step-by-step breakdown of the table. Maybe 
I’ll try and think of a nice visual way to represent these Lua tables!

Thomas
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Re: [NTG-context] lua tables - how do you cope?

[Lukas Prochazka]

Hello Thomas,

here is my "dump()" I've been using for several years:


function dump(arg, opts) -- .seen, .pfx
  if type(opts) == "string" then print(opts); opts = nil
  elseif opts == true then print("-- (dump)"); opts = nil
  end

  local pfx = opts and opts.pfx
  local seen = opts and opts.seen or {}

  if type(arg) == "table" then
if pfx then pfx = pfx .. "]["
else
  pfx = "["
  --seen = {}
end

seen[arg] = tostring(arg) --true

local keys = {}

do
  -- Sort keys, if all are strings

  local strs_only = true

  for k in pairs(arg) do
if strs_only and type(k) ~= "string" then strs_only = false end

keys[#keys + 1] = k
  end

  if strs_only then table.sort(keys) end
end

for _, key in ipairs(keys) do
  local val = arg[key]

  io.write(pfx .. tostring(key) .. "] = " .. tostring(val) .. "\t(" .. 
type(val) .. ")")

  if type(val) == "table" then
if seen[val] then print(" (seen)")
else
  print()

  dump(val, {pfx = pfx .. tostring(key), seen = seen}) --pfx .. 
tostring(key), seen)
end
  else
print()
  end
end
  else
print(arg)
  end
end


Try:


a = {c = 1, b = 2}; a.a = a

dump(a)
dump(a, "This is 'a'.")


Improvements or parametrization of visualizing style would be possible, of 
course... 

Best regards,

Lukas


- Original Message -
From: Schmitz Thomas A. [mailto:thomas.schm...@uni-bonn.de]
To: mailing list for ConTeXt users [mailto:ntg-context@ntg.nl]
Sent: Sat, 30 Jul 2016 23:01:29 +0100
Subject: Re: [NTG-context] lua tables - how do you cope?


> Thank you, but this is not what I’m looking for. I know how to sort a table, 
> and I know the Lua table tutorial (the Lua wiki is, IMHO, really terrible and 
> disorganized). I have to construct deeply nested tables and sometimes lose 
> track of what is at what level of my table, so I was wondering if there was 
> an easy way of visualizing a nested table. On the web, you can find a number 
> of (mostly abandoned) projects; the one at 
> http://siffiejoe.github.io/lua-microscope/ says: "Many Lua programmers have 
> written their own pretty-printer or data dumper and some even use it for 
> (de-)serializing Lua data structures.” So I was wondering if any of the Lua 
> users here on the list has something they want to share.

Thomas
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Re: [NTG-context] lua tables - how do you cope?

[Arthur Reutenauer]

On Sat, Jul 30, 2016 at 11:01:29PM +0200, Schmitz Thomas A. wrote:
> Thank you, but this is not what I’m looking for. I know how to sort a table, 
> and I know the Lua table tutorial (the Lua wiki is, IMHO, really terrible and 
> disorganized). I have to construct deeply nested tables and sometimes lose 
> track of what is at what level of my table, so I was wondering if there was 
> an easy way of visualizing a nested table. On the web, you can find a number 
> of (mostly abandoned) projects; the one at 
> http://siffiejoe.github.io/lua-microscope/ says: "Many Lua programmers have 
> written their own pretty-printer or data dumper and some even use it for 
> (de-)serializing Lua data structures.” So I was wondering if any of the Lua 
> users here on the list has something they want to share.

  Well, there’s table.serialize from the ConTeXt core, which fits nicely
in the description you quote.

Best,

Arthur
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Re: [NTG-context] lua tables - how do you cope?

[Schmitz Thomas A.]

Thank you, but this is not what I’m looking for. I know how to sort a table, 
and I know the Lua table tutorial (the Lua wiki is, IMHO, really terrible and 
disorganized). I have to construct deeply nested tables and sometimes lose 
track of what is at what level of my table, so I was wondering if there was an 
easy way of visualizing a nested table. On the web, you can find a number of 
(mostly abandoned) projects; the one at 
http://siffiejoe.github.io/lua-microscope/ says: "Many Lua programmers have 
written their own pretty-printer or data dumper and some even use it for 
(de-)serializing Lua data structures.” So I was wondering if any of the Lua 
users here on the list has something they want to share.

Thomas


> On 30 Jul 2016, at 16:31, Wolfgang Schuster  
> wrote:
> 
>> If the requirement is to iterate on a table having the keys, values sorted 
>> by key (assuming the keys can be sorted), there are ways to do this. Please 
>> see http://lua-users.org/wiki/SortedIteration for an example (this just 
>> replaces pairs(t) with orderedPairs(t)). 
> 
> \starttext
> 
> \startluacode
> 
> local testtable = { z = "A", y = "B", x = "C" }
> 
> for i, j in next, testtable do
> context("%s:%s",i,j)
> context.par()
> end
> 
> context.blank()
> 
> for i, j in table.sortedhash(testtable) do
> context("%s:%s",i,j)
> context.par()
> end
> 
> \stopluacode
> 
> \stoptext
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Re: [NTG-context] lua tables - how do you cope?

[Wolfgang Schuster]

Joseph Canedo 
30. Juli 2016 um 15:04

If the requirement is to iterate on a table having the keys, values 
sorted by key (assuming the keys can be sorted), there are ways to do 
this. Please see http://lua-users.org/wiki/SortedIteration for an 
example (this just replaces pairs(t) with orderedPairs(t)).




\starttext

\startluacode

local testtable = { z = "A", y = "B", x = "C" }

for i, j in next, testtable do
context("%s:%s",i,j)
context.par()
end

context.blank()

for i, j in table.sortedhash(testtable) do
context("%s:%s",i,j)
context.par()
end

\stopluacode

\stoptext

Wolfgang
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Re: [NTG-context] lua tables - how do you cope?

[Joseph Canedo]

If the requirement is to iterate on a table having the keys, values sorted by 
key (assuming the keys can be sorted), there are ways to do this. Please see 
http://lua-users.org/wiki/SortedIteration for an example (this just replaces 
pairs(t) with orderedPairs(t)).

Hope this helps

Joseph

De : Schmitz Thomas A.___
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[NTG-context] lua tables - how do you cope?

[Schmitz Thomas A.]

This is less a specific question about ConTeXt than a hope for good advice: I’m 
maltreating my xml files with a mixture of TeX and Lua. I want to extract and 
typeset information in different forms, so I first collect everything in lua 
tables, rearrange and order these tables and typeset the results. All fine and 
dandy. My problem is that I have to have tables within tables within tables… 
you get the picture. One aspect of Lua that is really bugging me is the fact 
that associative tables have no order, which can be a pain in the butt for this 
kind of operation. So I have to be careful that I have to use constructs that 
will keep the order in which items have been added and loop through them via 
ipairs() instead of pairs(). I find it difficult to keep track of what’s inside 
my layers upon layers of tables. So my question is: how do those of you who are 
more experienced with this kind of question proceed? Do you have any handy tool 
to visualize a table? Any tips you want to share?

Thanks a lot!

Thomas
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