From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Attributes
Date: Wed, 23 Apr 2014 11:00:27 +0200 [thread overview]
Message-ID: <5357812B.7010605@wxs.nl> (raw)
In-Reply-To: <alpine.LNX.2.00.1404221954040.8109@zbox.seix>
On 4/22/2014 8:10 PM, Stéphane Goujet wrote:
> On Tue, 22 Apr 2014, Hans Hagen wrote:
>
>> On 4/20/2014 3:14 PM, Stéphane Goujet wrote:
>>> I would like to know what is the recommended way to use
>>> attributes in
>>> Context.
>>> What is the Context way to declare and set attributes? Is it something
>>> like this?
>>> \defineattribute[myattr]
>>> \dosetattribute{myattr}{1}
>>>
>>> And how do I then access them from Lua? Should it look like
>>> has_attribute(mynode, attributes.myattr)
>>> or
>>> has_attribute(mynode, attributes.xxxxx("myattr"))
>>> or something else?
>>
>> attributes.names[...]
>> attributes.numbers[...]
>
> Please have a look at my example (it is a bit long because it shows
> various possibilities) and its result.
> When I have not yet done a \defineattribute[myattr], node.has_attribute
> returns 0 when I thought it should return nil.
> When I do \defineattribute[...], every attribute seems to get the
> same number (1024), but now node.has_attribute returns nil ...
change this is syst-ini.mkiv:
\normalprotected\def\newattribute{\syst_basics_allocate\c_syst_last_allocated_attribute\attribute\attributedef\c_syst_max_allocated_register}
> =========================
> Example
> =========================
> \starttext
>
> \startluacode
> mycallback=function(head)
> if attributes.names==nil then
> print "No attribute names at all"
> end
> if attributes.numbers==nil then
> print "No attribute numbers at all"
> end
> for mynode in node.traverse_id(node.id("glyph"), head) do
> if string.match("0ABCDEabcdefg",
> unicode.utf8.char(mynode.char)) then
> print ("Glyph = "..unicode.utf8.char(mynode.char))
> if attributes.numbers["myattr"]==nil then
> print "No attribute number for myattr"
> else
> print ("myattr : number =
> "..(attributes.numbers["myattr"]))
> end
> if attributes.numbers["myattrb"]==nil then
> print "No attribute number for myattrb"
> else
> print ("myattrb : number =
> "..(attributes.numbers["myattrb"]))
> end
> if node.has_attribute(mynode,
> attributes.numbers["myattr"]) then
> print ("Attribute myattr =
> "..(node.has_attribute(mynode, attributes.numbers["myattr"])))
> else
> print "No attribute myattr"
> end
> if node.has_attribute(mynode,
> attributes.numbers["myattrb"]) then
> print ("Attribute myattrb =
> "..(node.has_attribute(mynode, attributes.numbers["myattrb"])))
> else
> print "No attribute myattrb"
> end
> if node.has_attribute(mynode, 111) then
> print ("Attribute 111 =
> "..(node.has_attribute(mynode, 111)))
> else
> print "No attribute 111"
> end
> end
> end
> return head
> end
>
> nodes.tasks.appendaction("processors", "before", "mycallback")
> \stopluacode
>
> 0
>
> \attribute111=-1
> A
>
> \attribute111=200
> B
>
> \attribute111=202
> C
>
> \attribute111=-1
> D
>
> \attribute111=-"7FFFFFFF
> E
>
> \defineattribute[myattr]
> \defineattribute[myattrb]
> a
>
> \doresetattribute{myattr}
> b
>
> \dosetattribute{myattr}{500}
> c
>
> \dosetattribute{myattr}{502}
> d
>
> \doresetattribute{myattr}
> e
>
>
> \stoptext
> ======================
>
>
> ======================
> Result :
> ======================
> Glyph = 0
> No attribute number for myattr
> No attribute number for myattrb
> Attribute myattr = 0
> Attribute myattrb = 0
> No attribute 111
> Glyph = A
> No attribute number for myattr
> No attribute number for myattrb
> Attribute myattr = 0
> Attribute myattrb = 0
> Attribute 111 = -1
> Glyph = B
> No attribute number for myattr
> No attribute number for myattrb
> Attribute myattr = 0
> Attribute myattrb = 0
> Attribute 111 = 200
> Glyph = C
> No attribute number for myattr
> No attribute number for myattrb
> Attribute myattr = 0
> Attribute myattrb = 0
> Attribute 111 = 202
> Glyph = D
> No attribute number for myattr
> No attribute number for myattrb
> Attribute myattr = 0
> Attribute myattrb = 0
> Attribute 111 = -1
> Glyph = E
> No attribute number for myattr
> No attribute number for myattrb
> Attribute myattr = 0
> Attribute myattrb = 0
> No attribute 111
> Glyph = a
> myattr : number = 1024
> myattrb : number = 1024
> No attribute myattr
> No attribute myattrb
> No attribute 111
> Glyph = b
> myattr : number = 1024
> myattrb : number = 1024
> No attribute myattr
> No attribute myattrb
> No attribute 111
> Glyph = c
> myattr : number = 1024
> myattrb : number = 1024
> No attribute myattr
> No attribute myattrb
> No attribute 111
> Glyph = d
> myattr : number = 1024
> myattrb : number = 1024
> No attribute myattr
> No attribute myattrb
> No attribute 111
> Glyph = e
> myattr : number = 1024
> myattrb : number = 1024
> No attribute myattr
> No attribute myattrb
> No attribute 111
> ======================
>
> Goodbye,
> Stéphane.
>
>
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive : http://foundry.supelec.fr/projects/contextrev/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
>
--
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Hans Hagen | PRAGMA ADE
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___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2014-04-23 9:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-20 13:14 Attributes Stéphane Goujet
2014-04-22 12:05 ` Attributes Hans Hagen
2014-04-22 18:10 ` Attributes Stéphane Goujet
2014-04-23 9:00 ` Hans Hagen [this message]
2014-04-23 13:07 ` Attributes Stéphane Goujet
2014-04-23 17:08 ` Attributes Hans Hagen
2014-04-23 23:39 ` Attributes Stéphane Goujet
2014-04-24 8:00 ` Attributes Hans Hagen
2014-04-24 11:58 ` Attributes Stéphane Goujet
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