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REBOL [ Title: "Find Non-local Variables" Date: 25-May-2000 File: %nonlocal.r Author: "Carl Sassenrath" Usage: "dump-vars function-name" Purpose: { Provides an way to find local variables that have not been declared as locals. } Note: { This function displays words that MIGHT be a problem. Some variables may be shown that are part of object contexts and some variables may not be shown because they are set to values in other contexts or functions. } library: [ level: 'advanced platform: none type: [tool] domain: none tested-under: none support: none license: none see-also: none ] ] find-var-sets: func [ "Searches a block to find variable assignments." blk [any-block!] vars [block!] /local value ][ forall blk [ value: first :blk if any [block? :value paren? :value] [find-var-sets :value vars] if set-word? :value [insert vars make word! :value] if :value = 'set [ blk: next :blk if not tail? :blk [ value: first :blk if word? :value [insert vars :value] ] ] ] ] find-nonlocal: func [ "Returns a block of non-local variables for the function." funct [function!] /local code vars locals ][ locals: copy first :funct code: second :funct vars: copy [] ;-- Convert all arg and local variables to words: while [not tail? locals] [ either any [refinement? first locals any-word? first locals][ change locals to-word first locals locals: next locals ][remove locals] ] locals: head locals ;-- Find all variables and compare with defined locals: find-var-sets code vars difference/only intersect vars vars locals ] dump-vars: func [ "Display a list of all non-local variables used in a function." 'funct [word!] /local vars ][ either empty? vars: find-nonlocal get funct [ print "No undeclared local variables found." ][ print "Non-Local Variables:" sort vars foreach word vars [print [tab word]] ] exit ] example: [ ;--- Check all functions in system vals: second system/words foreach word first system/words [ if function? first vals [ if not empty? words: find-nonlocal first vals [ print [word mold words] ] ] vals: next vals ] halt ] do example
halt ;; to terminate script if DO'ne from webpage