[WebDNA] passing a variable in an include - precedence
This WebDNA talk-list message is from 2015
It keeps the original formatting.
numero = 112520
interpreted = N
texte = 88 Working on 8.2, we have decided to work on an issue mentioned by = Donovan: > Here is the test page: > http://www.euca.us/admin/tests/include-bug/test.html >=20 > The main issue for discussion is that when passing a variable in an = include >=20 > [include file=3Dsomefile.inc&var=3Dsomevalue] >=20 > You can=E2=80=99t overwrite the var value with a text context = [text]=E2=80=A6[/text] within somefile.inc. >=20 > So, if I do >=20 > [include file=3Dsomefile.inc&var=3D1] >=20 > it is fine. the tag [var] in the included file shows "1" >=20 > but if I do > [text]var=3D2[/text] > [include file=3Dsomefile.inc&var=3D[var]] >=20 > then the tag [var] in the included file shows "[var]" instead of "2" This isn't a simple problem, it goes pretty deep into how WebDNA = retrieves variables. The order of precedence for variable lookups is: 1.) [INCLUDE] cgi parameters 2.) text variables 3.) math variables 4.) regular cgi parameters (passed via URL or POST) These variables are all kept in separate variable lists, and there is = normally no checking between lists. So you can have a text and a CGI = variable with the same name at the same time. Normally, WebDNA is taking advantage of the fact that regular CGI = parameters are going to be the earliest assignment of any variable, so = they can be treated with lowest priority and it will work correctly. = However, when you do an include, we need to create a new set of CGI = parameters that are treated as highest priority inside of a new context. = This creates all sorts of problems with getting the order of precedence = correct. We decided the best solution is to make all assignments of text = variables delete similarly named CGI parameters in all [INCLUDE] = contexts. This makes it work correctly even if you include a file inside = of another include. [math] variable assignments though will still be ignored if there is a = conflicting variable passed via an include. [math] variables are already treated as inferior. For example, this code = returns Var=3D4: [text]var=3D4[/text] [math]var=3D1[/math] Var=3D[var] With 8.2, Donovan test shows this output now: Value of VAR from first include: 1 Value of VAR after setting it in first include: 2 Value of VAR from second include: 2 --------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
. To unsubscribe, E-mail to: archives: http://mail.webdna.us/list/talk@webdna.us Bug Reporting: support@webdna.us .
Associated Messages, from the most recent to the oldest:
88 Working on 8.2, we have decided to work on an issue mentioned by = Donovan: > Here is the test page: > http://www.euca.us/admin/tests/include-bug/test.html >=20 > The main issue for discussion is that when passing a variable in an = include >=20 > [include file=3Dsomefile.inc&var=3Dsomevalue] >=20 > You can=E2=80=99t overwrite the var value with a text context = [text]=E2=80=A6[/text] within somefile.inc. >=20 > So, if I do >=20 > [include file=3Dsomefile.inc&var=3D1] >=20 > it is fine. the tag [var] in the included file shows "1" >=20 > but if I do > [text]var=3D2[/text] > [include file=3Dsomefile.inc&var=3D[var]] >=20 > then the tag [var] in the included file shows "[var]" instead of "2" This isn't a simple problem, it goes pretty deep into how WebDNA = retrieves variables. The order of precedence for variable lookups is: 1.) [include] cgi parameters 2.) text variables 3.) math variables 4.) regular cgi parameters (passed via URL or POST) These variables are all kept in separate variable lists, and there is = normally no checking between lists. So you can have a text and a CGI = variable with the same name at the same time. Normally, WebDNA is taking advantage of the fact that regular CGI = parameters are going to be the earliest assignment of any variable, so = they can be treated with lowest priority and it will work correctly. = However, when you do an include, we need to create a new set of CGI = parameters that are treated as highest priority inside of a new context. = This creates all sorts of problems with getting the order of precedence = correct. We decided the best solution is to make all assignments of text = variables delete similarly named CGI parameters in all [include] = contexts. This makes it work correctly even if you include a file inside = of another include. [math] variable assignments though will still be ignored if there is a = conflicting variable passed via an include. [math] variables are already treated as inferior. For example, this code = returns Var=3D4: [text]var=3D4[/text] [math]var=3D1[/math] Var=3D[var] With 8.2, Donovan test shows this output now: Value of VAR from first include: 1 Value of VAR after setting it in first include: 2 Value of VAR from second include: 2 --------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: archives: http://mail.webdna.us/list/talk@webdna.us Bug Reporting: support@webdna.us .
christophe.billiottet@webdna.us
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