{{ double braces }}

{{ double braces }}

[Steffen Wolfrum]

Hi,

I would like to use in my documents double braces for the footnote –  
for easily matching entire footnotes with RegEx  (thus it can't  
confuse with the nested braces) ...

text\footnote{{this is {\it one} tiny note\index{note}!}}

... and match the entire footnote with search regex for \\footnote\{\ 
{.+\}\}


Is this save? Or are there unwanted side-effects when using \footnote 
{{ ... }} ?

Steffen



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Re: {{ double braces }}

[Mikael Persson]

Hi Steffen,

I don't really know regex, but how does your double brace work with
the following

\footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote}}

note the double }} in the math formula.

/Micke P

On Jan 21, 2008 3:45 PM, Steffen Wolfrum <context@st.estfiles.de> wrote:
> Hi,
>
> I would like to use in my documents double braces for the footnote –
> for easily matching entire footnotes with RegEx  (thus it can't
> confuse with the nested braces) ...
>
> text\footnote{{this is {\it one} tiny note\index{note}!}}
>
> ... and match the entire footnote with search regex for \\footnote\{\
> {.+\}\}
>
>
> Is this save? Or are there unwanted side-effects when using \footnote
> {{ ... }} ?
>
> Steffen
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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>
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Re: {{ double braces }}

[Steffen Wolfrum]

math formula is one of the few things I definitely don't have to take  
care for =o)
up to now ...

thanks for the tip!

steffen


Am 21.01.2008 um 16:02 schrieb Mikael Persson:

> Hi Steffen,
>
> I don't really know regex, but how does your double brace work with
> the following
>
> \footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote}}
>
> note the double }} in the math formula.
>
> /Micke P
>
> On Jan 21, 2008 3:45 PM, Steffen Wolfrum <context@st.estfiles.de>  
> wrote:
>> Hi,
>>
>> I would like to use in my documents double braces for the footnote –
>> for easily matching entire footnotes with RegEx  (thus it can't
>> confuse with the nested braces) ...
>>
>> text\footnote{{this is {\it one} tiny note\index{note}!}}
>>
>> ... and match the entire footnote with search regex for \\footnote\{\
>> {.+\}\}
>>
>>
>> Is this save? Or are there unwanted side-effects when using \footnote
>> {{ ... }} ?
>>
>> Steffen
>>
>>
>>
>> _____________________________________________________________________ 
>> ______________
>> If your question is of interest to others as well, please add an  
>> entry to the Wiki!
>>
>> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ 
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>> _____________________________________________________________________ 
>> ______________
>>
> ______________________________________________________________________ 
> _____________
> If your question is of interest to others as well, please add an  
> entry to the Wiki!
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> _____________

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Re: {{ double braces }}

[Peter Münster]

On Mon, Jan 21 2008, Steffen Wolfrum wrote:
> 
> I would like to use in my documents double braces for the footnote –  
> for easily matching entire footnotes with RegEx  (thus it can't  
> confuse with the nested braces) ...
> 
> text\footnote{{this is {\it one} tiny note\index{note}!}}
> 
> ... and match the entire footnote with search regex for \\footnote\{\ 
> {.+\}\}

Hi Steffen,

have you already tried
http://archive.contextgarden.net/message/20060730.070820.14c7c91e.en.html
(extended regexp)?

Cheers, Peter

-- 
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Re: {{ double braces }}

[Peter Münster]

On Wed, Jan 23 2008, Peter Münster wrote:
> On Mon, Jan 21 2008, Steffen Wolfrum wrote:
> > 
> > I would like to use in my documents double braces for the footnote –  
> > for easily matching entire footnotes with RegEx  (thus it can't  
> > confuse with the nested braces) ...
> > 
> > text\footnote{{this is {\it one} tiny note\index{note}!}}
> > 
> > ... and match the entire footnote with search regex for \\footnote\{\ 
> > {.+\}\}
> 
> have you already tried
> http://archive.contextgarden.net/message/20060730.070820.14c7c91e.en.html
> (extended regexp)?

I've just seen, that it does not work for nested braces:
\footnote{x{y}z}:   ok
\footnote{x{y{z}}}: not ok

The next one (normal regexp, not extended) has support for up to one level
of nesting:

\\footnote{[^{}]*\([^{}]*{[^{}]*\([^{}]*{[^{}]*}[^{}]*\)*[^{}]*}[^{}]*\)*[^{}]*}

These examples seem to work:
\footnote{x{y}z}
\footnote{x{y{z}}}
\footnote{x{y}z}
\footnote{x{y{z}}x{y{z}}x{y}z}
\footnote{x{y{z}}x{y{z}y{z}y}x{y}z}

Cheers, Peter

-- 
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Re: {{ double braces }}

[Thomas A. Schmitz]

On Jan 23, 2008, at 10:50 PM, Peter Münster wrote:

> I've just seen, that it does not work for nested braces:
> \footnote{x{y}z}:   ok
> \footnote{x{y{z}}}: not ok
>
> The next one (normal regexp, not extended) has support for up to one  
> level
> of nesting:
>
> \\footnote{[^{}]*\([^{}]*{[^{}]*\([^{}]*{[^{}]*}[^{}]*\)*[^{}]*} 
> [^{}]*\)*[^{}]*}
>
> These examples seem to work:
> \footnote{x{y}z}
> \footnote{x{y{z}}}
> \footnote{x{y}z}
> \footnote{x{y{z}}x{y{z}}x{y}z}
> \footnote{x{y{z}}x{y{z}y{z}y}x{y}z}
>
> Cheers, Peter

You could also use a nice scripting language like ... lua!! lua has  
support for "balanced strings," so no nesting trickery is needed, see http://www.lua.org/pil/20.2.html 
  (scroll to the bottom of the page). Or you could try and nag Hans  
into giving a nice tutorial on the lua lpeg library at Bohinj! :-)


All best

Thomas
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Re: {{ double braces }}

[Aditya Mahajan]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 1306 bytes --]

On Wed, 23 Jan 2008, Thomas A. Schmitz wrote:

>
> On Jan 23, 2008, at 10:50 PM, Peter Münster wrote:
>
>> I've just seen, that it does not work for nested braces:
>> \footnote{x{y}z}:   ok
>> \footnote{x{y{z}}}: not ok
>>
>> The next one (normal regexp, not extended) has support for up to one
>> level
>> of nesting:
>>
>> \\footnote{[^{}]*\([^{}]*{[^{}]*\([^{}]*{[^{}]*}[^{}]*\)*[^{}]*}
>> [^{}]*\)*[^{}]*}

Wow. This shows regexes are easier to write than read. I would have never 
managed to read what this does (and I know regexes fairly well).

>> These examples seem to work:
>> \footnote{x{y}z}
>> \footnote{x{y{z}}}
>> \footnote{x{y}z}
>> \footnote{x{y{z}}x{y{z}}x{y}z}
>> \footnote{x{y{z}}x{y{z}y{z}y}x{y}z}
>>
>> Cheers, Peter
>
> You could also use a nice scripting language like ... lua!! lua has
> support for "balanced strings," so no nesting trickery is needed, see http://www.lua.org/pil/20.2.html
>  (scroll to the bottom of the page). Or you could try and nag Hans
> into giving a nice tutorial on the lua lpeg library at Bohinj! :-)

Another option is Gema <http://gema.sourceforge.net/new/index.shtml> (also 
has a lua library gel http://gema.sourceforge.net/new/gel.shtml). You can 
define regions and matching nested braces quite easily.

Aditya

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Re: {{ double braces }}

[Thomas A. Schmitz]

On Jan 24, 2008, at 12:19 AM, Aditya Mahajan wrote:

> Another option is Gema <http://gema.sourceforge.net/new/index.shtml>  
> (also has a lua library gelhttp://gema.sourceforge.net/new/ 
> gel.shtml). You can define regions and matching nested braces quite  
> easily.
>
> Aditya

Hi Aditya,

I remember I had a look at gema before but couldn't really find out  
what was special about it and would warrant further attention. I also  
haven't seen anything about nested braces etc. (which would be great  
for processing TeX files but is a major pain in the back with regexs).  
You seem to know more about it: could you give an example of how it's  
possible to have nested braces in a gema pattern?

Thomas
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Re: {{ double braces }}

[Taco Hoekwater]

Thomas A. Schmitz wrote:
> 
> You could also use a nice scripting language like ... lua!! lua has  
> support for "balanced strings," so no nesting trickery is needed, 
> see http://www.lua.org/pil/20.2.html 
>   (scroll to the bottom of the page). Or you could try and nag Hans  
> into giving a nice tutorial on the lua lpeg library at Bohinj! :-)

Even in bare lua, it is very easy to match balanced braces:

   local data = "\\footnote{x{y}z}"

   local match = "\\footnote%s%b{}"
   local i = 0
   while true do
      i,j = string.find(data, match, i+1)
      if i == nil then break end
      print(string.sub(data, i, j))
   end

with lpeg, the code looks a bit harder, but is still short and
relatively shortforward:

   local matchtable = { "TEXT",
     SP = lpeg.S" \n\t"^0,
     BODY = lpeg.P{ "{" * ((1 - lpeg.S"{}") + lpeg.V(1))^0 * "}" },
     FOOTNOTE = lpeg.P"\\footnote" * lpeg.V"SP" * lpeg.V"BODY" / print,
     TEXT = (lpeg.V"FOOTNOTE" + 1)^0 * -1,
   }
   lpeg.match(matchtable, data)

Best wishes,
Taco
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Re: {{ double braces }}

[Taco Hoekwater]

Taco Hoekwater wrote:
> 
> with lpeg, the code looks a bit harder, but is still short and
> relatively shortforward:

Here is a smarter lpeg that takes care of embedded \{ as well:

   local P, S, V = lpeg.P, lpeg.S, lpeg.V
   local matchtable = {
      "TEXT",
      TEXT = (V("FOOTNOTE") + 1)^0 * -1,
      SP = S(" \n\t")^0,
      BODY = "{"*(P("\\{")+P("\\}")+(1 - S("{}"))+V("BODY"))^0*"}",
      FOOTNOTE = "\\footnote" * V("SP") * V("BODY") / print,
   }
   lpeg.match(matchtable, data)

Quick explanation:

the symbol + is alternation, * is concatenation, - is exclusion,
^ is a repeat modifier, "" and P("") match strings, numbers
match bytes, S("") matches byte sets.

the "matchtable" describes the input data. In there,
matchtable[1] points to the "top" rule, which is "TEXT".
The other key-value pairs in the table say roughly this:

TEXT = an optional sequence [^0] of either footnote items
        [V("FOOTNOTE")] or non-footnote bytes [1], until
        the end of the data is reached [-1]
FOOTNOTE = the string '\footnote', followed by optional
        space, followed by the footnote body.
SP = zero or more occurrences of a space, tab, or newline byte
BODY = a left brace, followed by an optional sequence of
        four possible things:
        1. the string "\{" [P("\\{")]
        2. the string "\}" [P("\\}")]
        3. a byte that is not "{" nor "}"  [(1 - S("{}"))]
        4. a recursively included braced body [V("BODY")],
        followed by a right brace.

The [/print] runs the print() command on each successful
FOOTNOTE match.

Best wishes,
Taco

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Re: {{ double braces }}

[Aditya Mahajan]

Hi Thomas,

Sorry for the delay in the reply, I was travelling last week.

On Sat, 26 Jan 2008, Thomas A. Schmitz wrote:

>
> On Jan 24, 2008, at 12:19 AM, Aditya Mahajan wrote:
>
>> Another option is Gema <http://gema.sourceforge.net/new/index.shtml>
>> (also has a lua library gelhttp://gema.sourceforge.net/new/
>> gel.shtml). You can define regions and matching nested braces quite
>> easily.
>>
>> Aditya
>
> I remember I had a look at gema before but couldn't really find out
> what was special about it and would warrant further attention. I also
> haven't seen anything about nested braces etc. (which would be great
> for processing TeX files but is a major pain in the back with regexs).
> You seem to know more about it: could you give an example of how it's
> possible to have nested braces in a gema pattern?

Nested patterns is something where gema really excels. Here is a gema 
script to convert \footnote{{something}} to \footnote{something}

:\\footnote\W\{\{<matchbrace>\}\}=\\footnote\{$1\}
matchbrace:\{#\}=\{#\}
matchbrace:\\<Y1>=\\$1

Save it as footnote.gema and then run

gema -f footnote.gema tex-file > output-file

It handles these expressions correctly:

\footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote}}

\footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote with multiple {nested
{expressions}}}}

\footnote{{This $\frac{\left[\frac {a}{b}\right\}}{c}$ is a strange 
footnote}}

It is much easier to write than regular expressions. Unfortunately, gema 
expressions can be as hard as regular expressions to read.

Aditya


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Re: {{ double braces }}

[Steffen Wolfrum]

Actually I use this to highlight footnotes in my texteditor: colorize  
entire footnotes for for easier reading.

I am quite happy to have (on MacOSX) a text-editor that gives such  
"syntax coloring" flexibility: it is Satoshi Matsumoto's Jedit X. And  
here RegularExpressions are used for that purpose.

If someone knows an editor that does "syntax coloring" with lua or  
gema, I'd be very interested!

Thanks,

Steffen

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Re: {{ double braces }}

[Aditya Mahajan]

On Wed, 6 Feb 2008, Steffen Wolfrum wrote:

> Actually I use this to highlight footnotes in my texteditor: colorize
> entire footnotes for for easier reading.
>
> I am quite happy to have (on MacOSX) a text-editor that gives such
> "syntax coloring" flexibility: it is Satoshi Matsumoto's Jedit X. And
> here RegularExpressions are used for that purpose.
>
> If someone knows an editor that does "syntax coloring" with lua or
> gema, I'd be very interested!

In vim you can highlight comands and their "regions" using region start, 
region end, and region contains. That can be used to highlight footnotes. 
(I once used something similar for highlighting sections in LaTeX, but no 
longer have that code).

Of course, vim comes with rest of its baggage.

Aditya
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Re: {{ double braces }}

[Hans van der Meer]

On Wed, 6 Feb 2008, Steffen Wolfrum wrote:

> Actually I use this to highlight footnotes in my texteditor: colorize
> entire footnotes for for easier reading.
>
> I am quite happy to have (on MacOSX) a text-editor that gives such
> "syntax coloring" flexibility: it is Satoshi Matsumoto's Jedit X. And
> here RegularExpressions are used for that purpose.
>
> If someone knows an editor that does "syntax coloring" with lua or
> gema, I'd be very interested!

BBEdit on MacOSX also recognizes lua files, at least in version 8.7.2


Hans van der Meer

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Re: {{ double braces }}

[Steffen Wolfrum]

Am 06.02.2008 um 20:20 schrieb Hans van der Meer:

> On Wed, 6 Feb 2008, Steffen Wolfrum wrote:
>
>> Actually I use this to highlight footnotes in my texteditor: colorize
>> entire footnotes for for easier reading.
>>
>> I am quite happy to have (on MacOSX) a text-editor that gives such
>> "syntax coloring" flexibility: it is Satoshi Matsumoto's Jedit X. And
>> here RegularExpressions are used for that purpose.
>>
>> If someone knows an editor that does "syntax coloring" with lua or
>> gema, I'd be very interested!
>
> BBEdit on MacOSX also recognizes lua files, at least in version 8.7.2

Sure, but how does that affect syntax coloring??

Steffen
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Re: {{ double braces }}

[Hans van der Meer]

On 6 feb 2008, at 21:01, Steffen Wolfrum wrote:

>
> Am 06.02.2008 um 20:20 schrieb Hans van der Meer:
>
>> On Wed, 6 Feb 2008, Steffen Wolfrum wrote:
>>
>>> Actually I use this to highlight footnotes in my texteditor:  
>>> colorize
>>> entire footnotes for for easier reading.
>>>
>>> I am quite happy to have (on MacOSX) a text-editor that gives such
>>> "syntax coloring" flexibility: it is Satoshi Matsumoto's Jedit X.  
>>> And
>>> here RegularExpressions are used for that purpose.
>>>
>>> If someone knows an editor that does "syntax coloring" with lua or
>>> gema, I'd be very interested!
>>
>> BBEdit on MacOSX also recognizes lua files, at least in version 8.7.2
>
> Sure, but how does that affect syntax coloring??

It recognizes keywords, string constants and comments, each can have a  
different (user definable) color. The comment start (usually --) and  
optionally comment end can be chosen via a preference panel.

Hans van der Meer




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Re: {{ double braces }}

[Otared Kavian]

On 6 févr. 08, at 10:11, Steffen Wolfrum wrote:

> […]
>
> If someone knows an editor that does "syntax coloring" with lua or
> gema, I'd be very interested!

Hi Steffen,

Smultron does this on MacOS X:
http://smultron.sourceforge.net/

In fact one can define easily a set of syntax colouring for almost  
anything with Smultron.

Best regards: OK
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Re: {{ double braces }}

[Thomas A. Schmitz]

Hi Aditya,

now I need to apologize for being so slow to reply: thanks a lot, this  
looks really fascinating! I don't know how many things I've read on  
the web to understand if regexps can handle nested delimiters or not  
(I think the long and short of it was that on some mathematical  
principle it just isn't possible); there is some pretty obscure perl  
stuff that might be able to do it but is highly experimental. If gema  
really can do this, it should be a godsend for processing TeX files. I  
have it installed now on my OS X box (but couldn't build the gel  
binary) and am looking forward to experimenting with it.

All best, and thanks!

Thomas

On Feb 6, 2008, at 8:01 AM, Aditya Mahajan wrote:

> Nested patterns is something where gema really excels. Here is a gema
> script to convert \footnote{{something}} to \footnote{something}
>
> :\\footnote\W\{\{<matchbrace>\}\}=\\footnote\{$1\}
> matchbrace:\{#\}=\{#\}
> matchbrace:\\<Y1>=\\$1
>
> Save it as footnote.gema and then run
>
> gema -f footnote.gema tex-file > output-file
>
> It handles these expressions correctly:
>
> \footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote}}
>
> \footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote with  
> multiple {nested
> {expressions}}}}
>
> \footnote{{This $\frac{\left[\frac {a}{b}\right\}}{c}$ is a strange
> footnote}}
>
> It is much easier to write than regular expressions. Unfortunately,  
> gema
> expressions can be as hard as regular expressions to read.
>
> Aditya

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Re: {{ double braces }}

[Hans Hagen]

Thomas A. Schmitz wrote:
> Hi Aditya,
> 
> now I need to apologize for being so slow to reply: thanks a lot, this  
> looks really fascinating! I don't know how many things I've read on  
> the web to understand if regexps can handle nested delimiters or not  
> (I think the long and short of it was that on some mathematical  
> principle it just isn't possible); there is some pretty obscure perl  
> stuff that might be able to do it but is highly experimental. If gema  
> really can do this, it should be a godsend for processing TeX files. I  
> have it installed now on my OS X box (but couldn't build the gel  
> binary) and am looking forward to experimenting with it.

lua's pattern matcher can hanle nested {} (syntax: %b{} and such)

more clever things can be done with lpeg, bla {bla\{bla} and such

if you're up to date you may try

	mtxrun --script check sometexfile.tex

this is a (for the mooment simple) syntax checker i wrote a while ago 
which shows the principles

Hans


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Re: {{ double braces }}

[Aditya Mahajan]

On Tue, 12 Feb 2008, Hans Hagen wrote:

> Thomas A. Schmitz wrote:
>> Hi Aditya,
>>
>> now I need to apologize for being so slow to reply: thanks a lot, this
>> looks really fascinating! I don't know how many things I've read on
>> the web to understand if regexps can handle nested delimiters or not
>> (I think the long and short of it was that on some mathematical
>> principle it just isn't possible); there is some pretty obscure perl
>> stuff that might be able to do it but is highly experimental. If gema
>> really can do this, it should be a godsend for processing TeX files. I
>> have it installed now on my OS X box (but couldn't build the gel
>> binary) and am looking forward to experimenting with it.
>
> lua's pattern matcher can hanle nested {} (syntax: %b{} and such)
>
> more clever things can be done with lpeg, bla {bla\{bla} and such
>
> if you're up to date you may try
>
> 	mtxrun --script check sometexfile.tex
>
> this is a (for the mooment simple) syntax checker i wrote a while ago
> which shows the principles

I have been looking at different ways to parse TeX syntax since I 
occassionally do ConTeXt -> LaTeX conversion. Things like gema and regexs 
are ok for small things: e.g., convert ConTeXt section commands to LaTeX 
section commnads, convert figures, etc. Gema is better if you also want to 
convert ConTeXt font commands to LaTeX; since it is easier to write nested 
conversions. However, both fail miserably if you want to convert things 
like ConTeXt multi-line math statements to LaTeX. For that a real parser 
is needed. I have looked at Parsec (and Pandoc project) in Haskell, but 
have not made too much progress there. Maybe lpeg is an easier to 
understand parser. (But I sometimes get the feeling that the whole thing 
will be easier in TeX, since TeX already parses itself :)

Aditya
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Re: {{ double braces }}

[Taco Hoekwater]

Aditya Mahajan wrote:
> I have been looking at different ways to parse TeX syntax since I 
> occassionally do ConTeXt -> LaTeX conversion. Things like gema and regexs 
> are ok for small things: e.g., convert ConTeXt section commands to LaTeX 
> section commnads, convert figures, etc. Gema is better if you also want to 
> convert ConTeXt font commands to LaTeX; since it is easier to write nested 
> conversions. However, both fail miserably if you want to convert things 
> like ConTeXt multi-line math statements to LaTeX. For that a real parser 
> is needed. I have looked at Parsec (and Pandoc project) in Haskell, but 
> have not made too much progress there. Maybe lpeg is an easier to 
> understand parser. (But I sometimes get the feeling that the whole thing 
> will be easier in TeX, since TeX already parses itself :)

This is actualy pretty easy, I did that for a TeX->XML conversion once.
You have to redefine each and every command and make all special chars
like $ and _ \active, but it is in fact pretty easy and fairly reliable.

I would not do it like that again, these days I would use lpeg, but
it was not nearly as complicated to do it in tex macros as I had
anticipated.

Best wishes,
Taco

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Re: {{ double braces }}

[luigi scarso]

>  I would not do it like that again, these days I would use lpeg, but
>  it was not nearly as complicated to do it in tex macros as I had
>  anticipated.
A bit off-topic:
suppose that I , while I'm making format , I need to trace macro definitions
(\edef,\xdef,\def,\let and eventually alias like \let\define\def, so
also \define too,...)
This can be do only hacking  web source , or not ?



-- 
luigi
it's new .
it's powerful .
it's luatex .
http://www.luatex.org
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Re: {{ double braces }}

[Taco Hoekwater]

luigi scarso wrote:
>>  I would not do it like that again, these days I would use lpeg, but
>>  it was not nearly as complicated to do it in tex macros as I had
>>  anticipated.
> A bit off-topic:
> suppose that I , while I'm making format , I need to trace macro definitions
> (\edef,\xdef,\def,\let and eventually alias like \let\define\def, so
> also \define too,...)
> This can be do only hacking  web source , or not ?

If you set
   \tracingassigns=1
   \tracingrestores=1
you will get a dump in the log of all assignments (and that
includes definitions) as well as restores.

You will not get the full definitions of macros though, just the
first 32 tokens. If you want the full definition, you really have
to hack the web source.

Best wishes,
Taco


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Re: {{ double braces }}

[luigi scarso]

>  > A bit off-topic:
>  > suppose that I , while I'm making format , I need to trace macro definitions
>  > (\edef,\xdef,\def,\let and eventually alias like \let\define\def, so
>  > also \define too,...)
>  > This can be do only hacking  web source , or not ?
>
>  If you set
>    \tracingassigns=1
>    \tracingrestores=1
>  you will get a dump in the log of all assignments (and that
>  includes definitions) as well as restores.
>
>  You will not get the full definitions of macros though, just the
>  first 32 tokens. If you want the full definition, you really have
>  to hack the web source.

ok, I suppose it.
Hacking the web source should be also permit to trace  primitive of luatex .

Thank you very much

-- 
luigi
it's new .
it's powerful .
it's luatex .
http://www.luatex.org
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