* [NTG-context] get measures as dimension in Lua
@ 2024-06-09 20:12 Henning Hraban Ramm
2024-06-10 5:08 ` [NTG-context] " Max Chernoff
0 siblings, 1 reply; 6+ messages in thread
From: Henning Hraban Ramm @ 2024-06-09 20:12 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi,
when I define a measure on the TeX side, I used to get at the value in
Lua with tex.getdim, like:
\definemeasure[Bleed][3mm]
tex.getdimen("Bleed")
But now I get "incorrect dimen name".
I need it as a dimension, since I do calculations with other dimensions
like "topspace".
How should I do this correctly?
(I just assume this used to work – the code is old any maybe stuck in an
intermediate state where I switched from \newdim to \definemeasure…)
Hraban
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* [NTG-context] Re: get measures as dimension in Lua
2024-06-09 20:12 [NTG-context] get measures as dimension in Lua Henning Hraban Ramm
@ 2024-06-10 5:08 ` Max Chernoff
2024-06-10 8:28 ` Hans Hagen via ntg-context
0 siblings, 1 reply; 6+ messages in thread
From: Max Chernoff @ 2024-06-10 5:08 UTC (permalink / raw)
To: Henning Hraban Ramm, ntg-context
Hi Hraban,
On Sun, 2024-06-09 at 22:12 +0200, Henning Hraban Ramm wrote:
> when I define a measure on the TeX side, I used to get at the value in
> Lua with tex.getdim, like:
>
> \definemeasure[Bleed][3mm]
>
> tex.getdimen("Bleed")
>
> But now I get "incorrect dimen name".
> I need it as a dimension, since I do calculations with other dimensions
> like "topspace".
>
> How should I do this correctly?
There doesn't appear to be any official interfaces to get the value of a
measure from Lua, but the following should work okay:
\definemeasure[mymeasure][10pt]
\newdimen\mydimen \mydimen=10pt
\definemeasure[measureexpr][1in + 27.73pt]
\startluacode
-- Returns the unexpanded value of some variable in a namespace.
local function get_variable(namespace, variable)
-- -- Doesn't work since "measure" is defined as a "system namespace".
-- namespace = interfaces.getnamespace(namespace)
namespace = tokens.getters.macro("??" .. namespace)
return tokens.getters.macro(namespace .. variable)
end
-- Gets the value of a measure and converts it to an integer in sp units.
local function get_measure(name)
return tex.sp(get_variable("measure", name))
end
-- Gets the \dimexpr-evaluated value of a measure, in sp units.
local function get_measure_expr(name)
local namespace = tokens.getters.macro("??measure")
-- Undocumented, but seems to work as expected.
return tex.getdimensionvalue(namespace .. name)
end
-- Print the values of the lengths.
print(("="):rep(80))
print("mymeasure:" , get_measure("mymeasure") )
print("mydimen:" , tex.dimen["mydimen"] )
print("measureexpr:", get_measure_expr("measureexpr"))
print(("="):rep(80))
\stopluacode
\startTEXpage
\measure{mymeasure}
\the\mydimen
\measure{measureexpr}
\stopTEXpage
Thanks,
-- Max
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* [NTG-context] Re: get measures as dimension in Lua
2024-06-10 5:08 ` [NTG-context] " Max Chernoff
@ 2024-06-10 8:28 ` Hans Hagen via ntg-context
2024-06-10 8:58 ` Henning Hraban Ramm
0 siblings, 1 reply; 6+ messages in thread
From: Hans Hagen via ntg-context @ 2024-06-10 8:28 UTC (permalink / raw)
To: ntg-context; +Cc: Hans Hagen
On 6/10/2024 7:08 AM, Max Chernoff wrote:
> Hi Hraban,
>
> On Sun, 2024-06-09 at 22:12 +0200, Henning Hraban Ramm wrote:
>> when I define a measure on the TeX side, I used to get at the value in
>> Lua with tex.getdim, like:
>>
>> \definemeasure[Bleed][3mm]
>>
>> tex.getdimen("Bleed")
>>
>> But now I get "incorrect dimen name".
>> I need it as a dimension, since I do calculations with other dimensions
>> like "topspace".
>>
>> How should I do this correctly?
>
> There doesn't appear to be any official interfaces to get the value of a
> measure from Lua, but the following should work okay:
>
> \definemeasure[mymeasure][10pt]
>
> \newdimen\mydimen \mydimen=10pt
>
> \definemeasure[measureexpr][1in + 27.73pt]
>
> \startluacode
> -- Returns the unexpanded value of some variable in a namespace.
> local function get_variable(namespace, variable)
> -- -- Doesn't work since "measure" is defined as a "system namespace".
> -- namespace = interfaces.getnamespace(namespace)
> namespace = tokens.getters.macro("??" .. namespace)
> return tokens.getters.macro(namespace .. variable)
> end
>
> -- Gets the value of a measure and converts it to an integer in sp units.
> local function get_measure(name)
> return tex.sp(get_variable("measure", name))
> end
>
> -- Gets the \dimexpr-evaluated value of a measure, in sp units.
> local function get_measure_expr(name)
> local namespace = tokens.getters.macro("??measure")
> -- Undocumented, but seems to work as expected.
> return tex.getdimensionvalue(namespace .. name)
> end
>
> -- Print the values of the lengths.
> print(("="):rep(80))
> print("mymeasure:" , get_measure("mymeasure") )
> print("mydimen:" , tex.dimen["mydimen"] )
> print("measureexpr:", get_measure_expr("measureexpr"))
> print(("="):rep(80))
> \stopluacode
>
> \startTEXpage
> \measure{mymeasure}
> \the\mydimen
> \measure{measureexpr}
> \stopTEXpage
>
> Thanks,
> -- Max
Indeed we can have:
local namespace = tokens.getters.macro("??measure")
function tex.getmeasure(name,asdimen)
local value = tex.getdimensionvalue(namespace..name)
if asdimen then
return value .. "sp"
else
return value
end
and when you want to avoid the namespace you can do:
function tex.getmeasure(name,asdimen)
local value =
token.getexpansion("\\tointeger\\measured{"..name.."}")
if asdimen then
return value .. "sp"
else
return tonumber(value)
end
end
which is some 4 times slower. It'sindeed not documented (although there
are some examples in accessors-001.tex) but it's in one of my todo's
because I can use it in some places (there ar emopre such todo's) after
which it will be discussed in one of the lowlelvel manuals
i'll add tex.getmeasure to the core (but a bit different)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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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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* [NTG-context] Re: get measures as dimension in Lua
2024-06-10 8:28 ` Hans Hagen via ntg-context
@ 2024-06-10 8:58 ` Henning Hraban Ramm
2024-06-13 17:24 ` Henning Hraban Ramm
0 siblings, 1 reply; 6+ messages in thread
From: Henning Hraban Ramm @ 2024-06-10 8:58 UTC (permalink / raw)
To: ntg-context
Thank you, Max, for the effort and Hans for a core solution!
Am 10.06.24 um 10:28 schrieb Hans Hagen via ntg-context:
> Indeed we can have:
>
> local namespace = tokens.getters.macro("??measure")
>
> function tex.getmeasure(name,asdimen)
> local value = tex.getdimensionvalue(namespace..name)
> if asdimen then
> return value .. "sp"
> else
> return value
> end
>
> and when you want to avoid the namespace you can do:
>
> function tex.getmeasure(name,asdimen)
> local value =
> token.getexpansion("\\tointeger\\measured{"..name.."}")
> if asdimen then
> return value .. "sp"
> else
> return tonumber(value)
> end
> end
>
> which is some 4 times slower. It'sindeed not documented (although there
> are some examples in accessors-001.tex) but it's in one of my todo's
> because I can use it in some places (there ar emopre such todo's) after
> which it will be discussed in one of the lowlelvel manuals
>
> i'll add tex.getmeasure to the core (but a bit different)
Not to be misunderstood, I couldn’t check yet, maybe I wasn’t clear:
I need to process the measure as a dimension, like \measured{Bleed}.
As far as I tried, neither tex.measured nor context.measured worked (but
I wouldn’t swear on it, maybe I had a different error).
Hraban
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [NTG-context] Re: get measures as dimension in Lua
2024-06-10 8:58 ` Henning Hraban Ramm
@ 2024-06-13 17:24 ` Henning Hraban Ramm
2024-06-13 21:03 ` Hans Hagen via ntg-context
0 siblings, 1 reply; 6+ messages in thread
From: Henning Hraban Ramm @ 2024-06-13 17:24 UTC (permalink / raw)
To: ntg-context
Am 10.06.24 um 10:58 schrieb Henning Hraban Ramm:
>> local namespace = tokens.getters.macro("??measure")
>>
>> function tex.getmeasure(name,asdimen)
>> local value = tex.getdimensionvalue(namespace..name)
>> if asdimen then
>> return value .. "sp"
>> else
>> return value
>> end
So I needed just tex.getdimensionvalue(namespace..name)
> Not to be misunderstood, I couldn’t check yet, maybe I wasn’t clear:
>
> I need to process the measure as a dimension, like \measured{Bleed}.
>
> As far as I tried, neither tex.measured nor context.measured worked (but
> I wouldn’t swear on it, maybe I had a different error).
I understand now that a dimension in Lua is just a string.
I also messed a few thing up when I converted my macros from
measure-macros to measures.
Now my image calculations work again. Phew!
Thank you,
Hraban
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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* [NTG-context] Re: get measures as dimension in Lua
2024-06-13 17:24 ` Henning Hraban Ramm
@ 2024-06-13 21:03 ` Hans Hagen via ntg-context
0 siblings, 0 replies; 6+ messages in thread
From: Hans Hagen via ntg-context @ 2024-06-13 21:03 UTC (permalink / raw)
To: mailing list for ConTeXt users; +Cc: Hans Hagen
On 6/13/2024 7:24 PM, Henning Hraban Ramm wrote:
> Am 10.06.24 um 10:58 schrieb Henning Hraban Ramm:
>
>>> local namespace = tokens.getters.macro("??measure")
>>>
>>> function tex.getmeasure(name,asdimen)
>>> local value = tex.getdimensionvalue(namespace..name)
>>> if asdimen then
>>> return value .. "sp"
>>> else
>>> return value
>>> end
>
> So I needed just tex.getdimensionvalue(namespace..name)
just use tex.getmeasure in the upcoming
>> Not to be misunderstood, I couldn’t check yet, maybe I wasn’t clear:
>>
>> I need to process the measure as a dimension, like \measured{Bleed}.
>>
>> As far as I tried, neither tex.measured nor context.measured worked
>> (but I wouldn’t swear on it, maybe I had a different error).
>
> I understand now that a dimension in Lua is just a string.
no, it is a number (scaled points or sp) but it can have a string
representation
> I also messed a few thing up when I converted my macros from
> measure-macros to measures.
>
> Now my image calculations work again. Phew!
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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wiki : https://wiki.contextgarden.net
___________________________________________________________________________________
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