To those who have had some comments on embedded macros of the Dick persuasion, I should elaborate what I am really tyring to do with them, so that our internal latent structures are hallucinating in the same universe.
I implemented these embedded macros in C and found the task rather straight forward (chuckle). So I thought it would be a good test to see the robustness of Rebol and to have this capability. So here is a little more information about what I am really trying to do with the embedded macros. Would be great to see a good solution. *(EvaluateExpression) $(NamespaceLookup) %(EnvironmentVariable) @(DatabaseReference) !(CommandLine) = *(EvaluateExpression) =================== Interior content is to be executed in program space (Rebol) EXAMPLE: aa: "1" ab: "0" a: "*(aa)*(ab)" b: "*(aa)*(ab)" op: "*" print "The answer is: *(*(a)*(op)*(b)) I think" The answer is: 100 I think EXAMPLE: print "The answer is: *(a)*(op)*(b) I think" The answer is: 10*10 I think = $(NamespaceLookup) =================== Interior content is found via a namespace lookup function with interiorcontent as its argument EXAMPLE: print "The application is: $(APNAME)" The application is: MEI = %(EnvironmentVariable) =================== Interior content is environment variable looked up by function with interiorcontent as its argument EXAMPLE: print "Rebol's home directory is: %(REBOL_HOMEDIR)" Rebol's home directory is: c:\Rebol = @(DatabaseReference) =================== Interior content is database reference retrieved by function with interiorcontent as its argument split on colon delimeter. EXAMPLE: i.e. results in a query being executed -> select VV from db.tn where LN = 'ln' and VN = 'vn' print "The application home dir is: @(ncd:cfg_rtx:$(APNAME):homedir)" The application home dir is: MEI/applications = !(CommandLine) =================== Interior content is a command line to be executed and piped result replaces macro EXAMPLE: bindir: "somepath" print "myprog says: !(myprog @(ncd:cfg_rtx:$(APNAME):homedir)/*(bindir))" KESS - Keep et semple stewpid! So, you can see, I was trying to understand how to do the nested macro parsing so that I could implement these 5 types of macros. Dick Download NeoPlanet at http://www.neoplanet.com -- To unsubscribe from this list, please send an email to [EMAIL PROTECTED] with "unsubscribe" in the subject, without the quotes.
