RFC: compiling lpeg into pandoc

RFC: compiling lpeg into pandoc

[Albert Krewinkel]

Hi all,

I'd like to request views and opinions on the inclusion of a Lua library
into pandoc: the LPeg library is a small parsing library written in C to
be used with Lua. http://www.inf.puc-rio.br/~roberto/lpeg/

The motivation is that this library could be used to extend pandoc to
deal with new formats. A good example is jgm's "lunamark", which could
be modified to support custom syntax extensions that might otherwise be
difficult to implement with current filters.
https://github.com/jgm/lunamark/blob/master/lunamark/reader/markdown.lua

On the other hand, this is yet another library and could be considered
bloat. Most users, esp. on Mac and Linux, should not find it too
difficult to install the library on their system should they need it.

The question is therefore if you think whether including lpeg into
pandoc would make is worth it; e.g., do you believe you'd write such
LPeg-based parsers? Would you share them with people who wouldn't
immediately know how to install the library themselves?

Thanks in advance,
Albert


PS: The corresponding pull request is
    https://github.com/jgm/pandoc/pull/7649

--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

AW: compiling lpeg into pandoc

[denis.maier-NSENcxR/0n0]

Hi Albert,

well, the last time I've tried it I struggled with luarocks on windows. So, I'd welcome the addition of some libraries.

Best,
Denis

> -----Ursprüngliche Nachricht-----
> Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-
> discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> Im Auftrag von Albert Krewinkel
> Gesendet: Montag, 1. November 2021 14:38
> An: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> Betreff: RFC: compiling lpeg into pandoc
> 
> Hi all,
> 
> I'd like to request views and opinions on the inclusion of a Lua library into
> pandoc: the LPeg library is a small parsing library written in C to be used with
> Lua. http://www.inf.puc-rio.br/~roberto/lpeg/
> 
> The motivation is that this library could be used to extend pandoc to deal
> with new formats. A good example is jgm's "lunamark", which could be
> modified to support custom syntax extensions that might otherwise be
> difficult to implement with current filters.
> https://github.com/jgm/lunamark/blob/master/lunamark/reader/markdow
> n.lua
> 
> On the other hand, this is yet another library and could be considered bloat.
> Most users, esp. on Mac and Linux, should not find it too difficult to install
> the library on their system should they need it.
> 
> The question is therefore if you think whether including lpeg into pandoc
> would make is worth it; e.g., do you believe you'd write such LPeg-based
> parsers? Would you share them with people who wouldn't immediately
> know how to install the library themselves?
> 
> Thanks in advance,
> Albert
> 
> 
> PS: The corresponding pull request is
>     https://github.com/jgm/pandoc/pull/7649
> 
> --
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
> 
> --
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> https://groups.google.com/d/msgid/pandoc-
> discuss/87ee806loe.fsf%40zeitkraut.de.

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Re: RFC: compiling lpeg into pandoc

[BPJ]

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I would like it, especially if it could be used from inside Lua filters.
One could then embed snippets of a DSL in code blocks/spans with some
identifying attribute or raw blocks/spans with an identifying pseudo-format
or inside attribute values, parse the DSL inside the Lua filter and take
different paths based on the result.

For example my string interpolation DSL which I currently use a very slow
and very verbose parser written in pure Lua (well actually MoonScript :-)
where everything is enclosed in various brackets because balanced brackets
are easy to match in Lua patterns with the `%b()` construct. Since Lua
patterns don't support alternations or quantified groups I have to simulate
alternations with huge arrays of maps which specify patterns to try in
succession, along with the labels for the captures.

An example of an alternative in the table with possible interpolation forms:

``````moon
  [40]: {
    labels: {
      [1]: "path"
      [2]: "truth"
      [3]: "then_expr"
      [4]: "else_expr"
    }
    name: "path_if_non_empty_then_else"
    pat: "^%$%(%s*(%b<>)%s*(%&)%?%s*(%$?%b())%s*%&%!%s*(%$?%b())%s*%)$"
    strip: {
      else_expr: "()"
      path: "<>"
      then_expr: "()"
    }
  }
``````

This matches something which when embedded in Markdown looks something like
this:

``````markdown
`$( <var/foo> &? $(<var/bar>) &! $(<var/baz>) )`{.sic}
``````

where `<var/foo>` etc. each references a value in a mapping of `key:
string` pairs obtained from the metadata, and the whole inserts the value
of one of two such variables into the document depending on whether a third
variable is non-empty or not (basically a ternary).

The table with such alternatives is built programmatically in nested loops
over lists of subpatterns, so being able to use lpeg (probably even the re
module[^1] since I have already written a Perl implementation in Pegex[^2])
would both speed things up and reduce the volume of the code, so it would
be most welcome!

[^1]: http://www.inf.puc-rio.br/~roberto/lpeg/re.html
[^2]: https://metacpan.org/dist/Pegex/view/lib/Pegex/Syntax.pod



Den mån 1 nov. 2021 14:39Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
skrev:

> Hi all,
>
> I'd like to request views and opinions on the inclusion of a Lua library
> into pandoc: the LPeg library is a small parsing library written in C to
> be used with Lua. http://www.inf.puc-rio.br/~roberto/lpeg/
>
> The motivation is that this library could be used to extend pandoc to
> deal with new formats. A good example is jgm's "lunamark", which could
> be modified to support custom syntax extensions that might otherwise be
> difficult to implement with current filters.
> https://github.com/jgm/lunamark/blob/master/lunamark/reader/markdown.lua
>
> On the other hand, this is yet another library and could be considered
> bloat. Most users, esp. on Mac and Linux, should not find it too
> difficult to install the library on their system should they need it.
>
> The question is therefore if you think whether including lpeg into
> pandoc would make is worth it; e.g., do you believe you'd write such
> LPeg-based parsers? Would you share them with people who wouldn't
> immediately know how to install the library themselves?
>
> Thanks in advance,
> Albert
>
>
> PS: The corresponding pull request is
>     https://github.com/jgm/pandoc/pull/7649
>
> --
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
>
> --
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> To view this discussion on the web visit
> https://groups.google.com/d/msgid/pandoc-discuss/87ee806loe.fsf%40zeitkraut.de
> .
>

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AW: compiling lpeg into pandoc

[denis.maier-NSENcxR/0n0]

Ok, I've tried again. Installing luarocks on linux was easy, but I've had no success on Windows. Anyone knows how to install luarocks on Windows?

Anyway, so if I install modules via luarocks they become usable in filters? (That is, pandoc's lua will find those modules?)

Denis

> -----Ursprüngliche Nachricht-----
> Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-
> discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> Im Auftrag von denis.maier-NSENcxR/0n0@public.gmane.org
> Gesendet: Montag, 1. November 2021 23:06
> An: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> Betreff: AW: compiling lpeg into pandoc
> 
> Hi Albert,
> 
> well, the last time I've tried it I struggled with luarocks on windows. So, I'd
> welcome the addition of some libraries.
> 
> Best,
> Denis
> 
> > -----Ursprüngliche Nachricht-----
> > Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-
> > discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> Im Auftrag von Albert Krewinkel
> > Gesendet: Montag, 1. November 2021 14:38
> > An: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> > Betreff: RFC: compiling lpeg into pandoc
> >
> > Hi all,
> >
> > I'd like to request views and opinions on the inclusion of a Lua
> > library into
> > pandoc: the LPeg library is a small parsing library written in C to be
> > used with Lua. http://www.inf.puc-rio.br/~roberto/lpeg/
> >
> > The motivation is that this library could be used to extend pandoc to
> > deal with new formats. A good example is jgm's "lunamark", which could
> > be modified to support custom syntax extensions that might otherwise
> > be difficult to implement with current filters.
> >
> https://github.com/jgm/lunamark/blob/master/lunamark/reader/markdow
> > n.lua
> >
> > On the other hand, this is yet another library and could be considered
> bloat.
> > Most users, esp. on Mac and Linux, should not find it too difficult to
> > install the library on their system should they need it.
> >
> > The question is therefore if you think whether including lpeg into
> > pandoc would make is worth it; e.g., do you believe you'd write such
> > LPeg-based parsers? Would you share them with people who wouldn't
> > immediately know how to install the library themselves?
> >
> > Thanks in advance,
> > Albert
> >
> >
> > PS: The corresponding pull request is
> >     https://github.com/jgm/pandoc/pull/7649
> >
> > --
> > Albert Krewinkel
> > GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
> >
> > --
> > You received this message because you are subscribed to the Google
> > Groups "pandoc-discuss" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> > an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > To view this discussion on the web visit
> > https://groups.google.com/d/msgid/pandoc-
> > discuss/87ee806loe.fsf%40zeitkraut.de.
> 
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> discuss/83dbc2c6dcbe49e49e00dac40b73eb65%40unibe.ch.

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Re: AW: compiling lpeg into pandoc

[Albert Krewinkel]

denis.maier-NSENcxR/0n0@public.gmane.org writes:

> Anyway, so if I install modules via luarocks they become usable in
> filters? (That is, pandoc's lua will find those modules?)

The locations in which Lua searches for libraries are controlled via the
LUA_PATH and LUA_CPATH environment variables. There is a convenient
`luarocks path` command which shows the necessary settings and can be
used to set them:

    eval "$(luarocks path)"

After that, the Lua interpreter in pandoc should be able to find all
modules installed via luarocks. Just make sure that luarocks uses
Lua 5.3, which is the version included in pandoc.

Re: AW: compiling lpeg into pandoc

[BPJ]

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Note that if you use the static binaries from the release page you can not
use modules which use external (non-Lua) libraries. I have heard that if
you download the first nightly from after each release that can use
external libraries, but I'd rather not rely on that.

Note also that the environment variables LUA_PATH_5_3 and LUA_CPATH_5_3
will override those without the version suffix. See

https://web.archive.org/web/20210127030419/http://www.thijsschreijer.nl/blog/?p=1025

Den tis 2 nov. 2021 12:53Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
skrev:

>
> denis.maier-NSENcxR/0n0@public.gmane.org writes:
>
> > Anyway, so if I install modules via luarocks they become usable in
> > filters? (That is, pandoc's lua will find those modules?)
>
> The locations in which Lua searches for libraries are controlled via the
> LUA_PATH and LUA_CPATH environment variables. There is a convenient
> `luarocks path` command which shows the necessary settings and can be
> used to set them:
>
>     eval "$(luarocks path)"
>
> After that, the Lua interpreter in pandoc should be able to find all
> modules installed via luarocks. Just make sure that luarocks uses
> Lua 5.3, which is the version included in pandoc.
>
> --
> You received this message because you are subscribed to the Google Groups
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> https://groups.google.com/d/msgid/pandoc-discuss/878ry67p0o.fsf%40zeitkraut.de
> .
>

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AW: AW: compiling lpeg into pandoc

[denis.maier-NSENcxR/0n0]

The installed lua version is already 5.4.x Ist that a problem?
________________________________________
Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> im Auftrag von Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
Gesendet: Dienstag, 2. November 2021 12:52:55
An: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
Betreff: Re: AW: compiling lpeg into pandoc

denis.maier-NSENcxR/0n0@public.gmane.org writes:

> Anyway, so if I install modules via luarocks they become usable in
> filters? (That is, pandoc's lua will find those modules?)

The locations in which Lua searches for libraries are controlled via the
LUA_PATH and LUA_CPATH environment variables. There is a convenient
`luarocks path` command which shows the necessary settings and can be
used to set them:

    eval "$(luarocks path)"

After that, the Lua interpreter in pandoc should be able to find all
modules installed via luarocks. Just make sure that luarocks uses
Lua 5.3, which is the version included in pandoc.

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Re: AW: compiling lpeg into pandoc

[BPJ]

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I believe the Lua version bundled with Pandoc is still 5.3 so that will be
the one filters will use, and that may be a problem if some module uses 5.4
only features. IIIRC it is possible to have luarocks install different
versions of packages in different locations. Google is your friend. Also
for Linux look for luaver on GitHub.

In a hurry,

/bpj

Den tis 2 nov. 2021 14:29 <denis.maier-NSENcxR/0n0@public.gmane.org> skrev:

> The installed lua version is already 5.4.x Ist that a problem?
> ________________________________________
> Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> im
> Auftrag von Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
> Gesendet: Dienstag, 2. November 2021 12:52:55
> An: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> Betreff: Re: AW: compiling lpeg into pandoc
>
> denis.maier-NSENcxR/0n0@public.gmane.org writes:
>
> > Anyway, so if I install modules via luarocks they become usable in
> > filters? (That is, pandoc's lua will find those modules?)
>
> The locations in which Lua searches for libraries are controlled via the
> LUA_PATH and LUA_CPATH environment variables. There is a convenient
> `luarocks path` command which shows the necessary settings and can be
> used to set them:
>
>     eval "$(luarocks path)"
>
> After that, the Lua interpreter in pandoc should be able to find all
> modules installed via luarocks. Just make sure that luarocks uses
> Lua 5.3, which is the version included in pandoc.
>
> --
> You received this message because you are subscribed to the Google Groups
> "pandoc-discuss" group.
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> To view this discussion on the web visit
> https://groups.google.com/d/msgid/pandoc-discuss/878ry67p0o.fsf%40zeitkraut.de
> .
>
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> .
>

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Re: AW: compiling lpeg into pandoc

[krulis....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]

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Eventhough I am using mostly Linux, on some occasions I am on Windows and 
even on Linux it might be more convenient (from purely user perspective) to 
have LPeg included in pandoc because of different Lua versions, so I am 100 
% for such addition.
Regards Tomas

Dne úterý 2. listopadu 2021 v 14:37:55 UTC+1 uživatel BP napsal:

> I believe the Lua version bundled with Pandoc is still 5.3 so that will be 
> the one filters will use, and that may be a problem if some module uses 5.4 
> only features. IIIRC it is possible to have luarocks install different 
> versions of packages in different locations. Google is your friend. Also 
> for Linux look for luaver on GitHub.
>
> In a hurry,
>
> /bpj
>
> Den tis 2 nov. 2021 14:29 <denis...-NSENcxR/0n0@public.gmane.org> skrev:
>
>> The installed lua version is already 5.4.x Ist that a problem?
>> ________________________________________
>> Von: pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> im 
>> Auftrag von Albert Krewinkel <albert...-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
>> Gesendet: Dienstag, 2. November 2021 12:52:55
>> An: pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>> Betreff: Re: AW: compiling lpeg into pandoc
>>
>> denis...-NSENcxR/0n0@public.gmane.org writes:
>>
>> > Anyway, so if I install modules via luarocks they become usable in
>> > filters? (That is, pandoc's lua will find those modules?)
>>
>> The locations in which Lua searches for libraries are controlled via the
>> LUA_PATH and LUA_CPATH environment variables. There is a convenient
>> `luarocks path` command which shows the necessary settings and can be
>> used to set them:
>>
>>     eval "$(luarocks path)"
>>
>> After that, the Lua interpreter in pandoc should be able to find all
>> modules installed via luarocks. Just make sure that luarocks uses
>> Lua 5.3, which is the version included in pandoc.
>>
>> --
>> You received this message because you are subscribed to the Google Groups 
>> "pandoc-discuss" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/pandoc-discuss/878ry67p0o.fsf%40zeitkraut.de
>> .
>>
>> -- 
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>>
> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/pandoc-discuss/a4454aeb346b404ba248ee962bacd7cd%40unibe.ch
>> .
>>
>

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Re: RFC: compiling lpeg into pandoc

[Albert Krewinkel]

Thank you all for the answers!

It seemed that there were many proponents and few arguments against
including lpeg, so the decision was made to ship lpeg (and re) with
future pandoc versions.

Cheers,
Albert


Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org> writes:

> Hi all,
>
> I'd like to request views and opinions on the inclusion of a Lua library
> into pandoc: the LPeg library is a small parsing library written in C to
> be used with Lua. http://www.inf.puc-rio.br/~roberto/lpeg/
>
> The motivation is that this library could be used to extend pandoc to
> deal with new formats. A good example is jgm's "lunamark", which could
> be modified to support custom syntax extensions that might otherwise be
> difficult to implement with current filters.
> https://github.com/jgm/lunamark/blob/master/lunamark/reader/markdown.lua
>
> On the other hand, this is yet another library and could be considered
> bloat. Most users, esp. on Mac and Linux, should not find it too
> difficult to install the library on their system should they need it.
>
> The question is therefore if you think whether including lpeg into
> pandoc would make is worth it; e.g., do you believe you'd write such
> LPeg-based parsers? Would you share them with people who wouldn't
> immediately know how to install the library themselves?
>
> Thanks in advance,
> Albert
>
>
> PS: The corresponding pull request is
>     https://github.com/jgm/pandoc/pull/7649


--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124