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############################################################################
#
# File: iftrace.icn
#
# Subject: Procedures to trace Icon function calls
#
# Author: Stephen B. Wampler
#
# Date: July 14, 1997
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Contributor: Ralph E. Griswold
#
############################################################################
#
# These procedures provide tracing for Icon functions by using procedure
# wrappers to call the functions.
#
# iftrace(fncs[]) sets tracing for a list of function names.
#
############################################################################
#
# Note: The functions that can be traced and their procedure wrappers should
# be organized and coordinated to assure consistency and to allow for
# extended function repertoire.
#
############################################################################
#
# Links: ifncs
#
############################################################################
invocable all
link ifncs
procedure iftrace(args[]) #: trace built-in functions
local nextarg, arg
every set_trace(!args)
return
end
procedure set_trace(vf)
local vp
static traceset, case1, case2
initial {
traceset := set()
every insert(traceset, function())
case1 := &lcase || &ucase
case2 := &ucase || &lcase
}
if member(traceset,vf) then {
&trace := -1 # have to also trace all procedures!
vp := vf
# reverse case of first letter
vp[1] := map(vp[1], case1, case2)
variable(vp) :=: variable(vf)
return
}
else fail
end
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