catch % in gsub("%", "\\letterpercent")

Pablo Rodriguez

27 Aug 2020 27 Aug '20

3:11 p.m.

Dear list, I have and \xmlraw command that gives some text with percent signs. ConTeXt parses them as comments (so no output). Using Lua gsub(), I need to replace something like: string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent") How do I need to invoke % to get the character found? Many thanks for your help, Pablo -- http://www.ousia.tk

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Taco Hoekwater

27 Aug 27 Aug

3:30 p.m.

Hi,

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On 27 Aug 2020, at 17:11, Pablo Rodriguez wrote:

Dear list,

I have and \xmlraw command that gives some text with percent signs. ConTeXt parses them as comments (so no output).

Using Lua gsub(), I need to replace something like:

string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")

Double it: %% See also https://www.lua.org/manual/5.3/manual.html#6.4.1 , but the mention of %% is a bit hidden. Best wishes, Taco

Pablo Rodriguez

3:56 p.m.

On 8/27/20 5:30 PM, Taco Hoekwater wrote:

...

...
[...] Using Lua gsub(), I need to replace something like:

string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")

Double it: %%

See also https://www.lua.org/manual/5.3/manual.html#6.4.1 , but the mention of %% is a bit hidden.

Many thanks for your replies, Taco and Hans. I’m afraid this doesn’t work (and I need \xmlraw there): \startbuffer[demo] <html> <body> <div id="First"> <p>The <span class="special">% best</span> paragraph.</p> </div> </body> </html> \stopbuffer \startxmlsetups xml:initialize \xmlsetsetup{#1}{html}{xml:gen} \stopxmlsetups \xmlregistersetup{xml:initialize} \startxmlsetups xml:gen \startitemize \xmlfilter{#1}{/**/span[@class='special']/command(xml:special)} \stopitemize \stopxmlsetups \startxmlsetups xml:special \startitem \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%", "\\letterpercent")} \stopitem \stopxmlsetups \starttext \xmlprocessbuffer{main}{demo}{} \stoptext What am I missing or doing wrong there? Many thanks for your help, Pablo -- http://www.ousia.tk

Wolfgang Schuster

4:16 p.m.

Pablo Rodriguez schrieb am 27.08.2020 um 17:56:

...

On 8/27/20 5:30 PM, Taco Hoekwater wrote:

...
...
[...] Using Lua gsub(), I need to replace something like:

string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")

Double it: %%

See also https://www.lua.org/manual/5.3/manual.html#6.4.1 , but the mention of %% is a bit hidden.

Many thanks for your replies, Taco and Hans.

I’m afraid this doesn’t work (and I need \xmlraw there):

\startbuffer[demo] <html> <body> <div id="First"> <p>The <span class="special">% best</span> paragraph.</p> </div> </body> </html> \stopbuffer

\startxmlsetups xml:initialize \xmlsetsetup{#1}{html}{xml:gen} \stopxmlsetups

\xmlregistersetup{xml:initialize}

\startxmlsetups xml:gen \startitemize \xmlfilter{#1}{/**/span[@class='special']/command(xml:special)} \stopitemize \stopxmlsetups

\startxmlsetups xml:special \startitem \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%", "\\letterpercent")} \stopitem \stopxmlsetups

This works fine with your example \startxmlsetups xml:special \startitem \xmlflush{#1} \stopitem \stopxmlsetups and to escape special characters you can use context.escape() \startxmlsetups xml:special \startitem \cldcontext{context.escape([[\xmlraw{#1}{.}]])} \stopitem \stopxmlsetups Wolfgang

Pablo Rodriguez

5:16 p.m.

On 8/27/20 6:16 PM, Wolfgang Schuster wrote:

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Pablo Rodriguez schrieb am 27.08.2020 um 17:56:

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[...] \startxmlsetups xml:special \startitem \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%", "\\letterpercent")} \stopitem \stopxmlsetups [...] and to escape special characters you can use context.escape()

Many thanks for your reply, Wolfgang. I’m afraid that I need to keep $ in order to get some formulas: \cldcontext{(string.gsub([[\xmlraw{#1}{.}]], '<span class="'..'math inline'..'">', '$'):gsub("</span>", "\\ifmmode $\\fi"))}} Actually this is way more complex, but I need to catch % and have to substitution above. Many thanks for your help, Pablo -- http://www.ousia.tk

Wolfgang Schuster

5:35 p.m.

Pablo Rodriguez schrieb am 27.08.2020 um 19:16:

...

On 8/27/20 6:16 PM, Wolfgang Schuster wrote:

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Pablo Rodriguez schrieb am 27.08.2020 um 17:56:

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[...] \startxmlsetups xml:special \startitem \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%", "\\letterpercent")} \stopitem \stopxmlsetups [...] and to escape special characters you can use context.escape() Many thanks for your reply, Wolfgang.

I’m afraid that I need to keep $ in order to get some formulas:

\cldcontext{(string.gsub([[\xmlraw{#1}{.}]], '<span class="'..'math inline'..'">', '$'):gsub("</span>", "\\ifmmode $\\fi"))}}

Actually this is way more complex, but I need to catch % and have to substitution above.

You have to replace %% with \letterpercent\letterpercent because you're still playing with TeX rules. \startxmlsetups xml:special \startitem \cldcontext{string.gsub("\xmlraw{#1}{.}","\letterpercent\letterpercent","\\letterpercent{}")} \stopitem \stopxmlsetups To avoid these limitations create a new Lua function and call only this function in the setup: \startluacode moduledata = moduledata or { } function moduledata.special(str) return string.gsub(str,"%%","\\letterpercent{}") end \stopluacode \startxmlsetups xml:special \startitem \cldcontext{moduledata.special([[\xmlraw{#1}{.}]])} \stopitem \stopxmlsetups Wolfgang

Pablo Rodriguez

5:49 p.m.

On 8/27/20 7:35 PM, Wolfgang Schuster wrote:

...

[...] You have to replace %% with \letterpercent\letterpercent because you're still playing with TeX rules.

\startxmlsetups xml:special \startitem \cldcontext{string.gsub("\xmlraw{#1}{.}","\letterpercent\letterpercent","\\letterpercent{}")} \stopitem \stopxmlsetups

Many thanks for your reply, Wolfgang. Now I understand what was going on.

...

To avoid these limitations create a new Lua function and call only this function in the setup:

\startluacode

moduledata = moduledata or { }

function moduledata.special(str) return string.gsub(str,"%%","\\letterpercent{}") end

\stopluacode

\startxmlsetups xml:special \startitem \cldcontext{moduledata.special([[\xmlraw{#1}{.}]])} \stopitem \stopxmlsetups

Now I see that I have a lot to learn. Many thanks again for your help, Pablo -- http://www.ousia.tk

Hans van der Meer

3:39 p.m.

In Lua patterns % is a socalled magic character like ^$ etc. These are esacped with a %. Thus %% is what you need in the first string. dr. Hans van der Meer

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On 27 Aug 2020, at 17:11, Pablo Rodriguez wrote:

Dear list,

I have and \xmlraw command that gives some text with percent signs. ConTeXt parses them as comments (so no output).

Using Lua gsub(), I need to replace something like:

string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")

How do I need to invoke % to get the character found?

Many thanks for your help,

Pablo -- http://www.ousia.tk ___________________________________________________________________________________ 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 webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

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Hans van der Meer
Pablo Rodriguez
Taco Hoekwater
Wolfgang Schuster

catch % in gsub("%", "\\letterpercent")

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