Thought I'd throw in my 2c worth, seeing it was brought up at CFUG last night... have strung together a couple of custom tags that could achieve this for you.
I've used cf_strict and cf_declare as the tagnames, but call them what you like, and don't forget they can be thrown into a tag library and used with cfimport under mx.
Have a play with this - just cut along the dotted lines ;o)
-=-=-=- Source of test.cfm -=-=-=-
<CF_STRICT>
<CF_DECLARE colour1="red">
<CF_DECLARE colour2="green">
<CF_DECLARE colour3="pink">
<CF_DECLARE colour4="">
<CFSET colour3 = colour3 & colour2>
<CFSET color4 = colour1 & colour2>
</CF_STRICT>
<CFDUMP var="#variables#">
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
-=-=-=- Source of strict.cfm -=-=-=-
<CFSWITCH expression="#thistag.executionmode#">
<CFCASE value="start">
<CFSET request.declared_vars = "">
</CFCASE>
<CFCASE value="end">
<CFLOOP collection="#caller.variables#" item="thisvar">
<CFIF not ListFindNoCase(request.declared_vars,variables.thisvar)>
<CFOUTPUT>Not found:#thisvar#<br></CFOUTPUT>
</CFIF>
</CFLOOP>
</CFCASE>
</CFSWITCH>
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
-=-=-=- Source of declare.cfm -=-=-=-
<CFLOOP collection="#attributes#" ITEM="thisvar">
<CFSET caller.variables[#thisvar#] = attributes[#thisvar#]>
<CFSET request.declared_vars = listappend(request.declared_vars,thisvar)>
</CFLOOP>
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Note a few points:
- This works on the variables scope only, but could easily be adapted to other scopes.
- You can use <CF_DECLARE myvariable> syntax, but it sets the value to "true"
- I've only done a simple cfoutput at the end tag as a warning, but you could replace this with a _javascript_ popup, a CFLOG entry, and/or insert code to disable the behaviour completely in a production environment (bugs? what bugs?).
Food for thought....
Vaughan.
| "Warren" <[EMAIL PROTECTED]>
02/04/2003 10:02 AM
|
|
is there a CF version of "option explicit" (ASP) to force variables to be
declared to cut down on typo's
1)<cfset rowColour = "">
2)...
3)...
4)<cfif theCount mod 2 eq 0>
5) <cfset rowColour = colourA>
6)<cfelse>
7) <cfset rowColor = colourB>
8)</cfif>
look at line 7. I've accidentally declared a new variable!
any way around this?
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