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############################################################################
#
# File: makelsys.icn
#
# Subject: Procedures to convert L-Systems to records
#
# Author: Ralph E. Griswold
#
# Date: January 23, 1999
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# These procedures coverts a list corresponding to an L-System into an
# L-System record.
#
# See lindsys.icn for documentation about format.
#
# See linden.dat for an example of input data.
#
# See also linden.icn for a graphics version.
#
############################################################################
record Lsys(name, axiom, gener, angle, comment, productions)
procedure makelsys(lst) #: make L-system from list
local line, i, s, c, symbol, rewrite
local allchars, rhs, value, spec, result
result := Lsys()
rewrite := table()
allchars := '' # cset of all rhs characters
while line := get(lst) do {
line ? {
if symbol := move(1) & ="->" then {
rhs := tab(0)
rewrite[symbol] := rhs
allchars ++:= rhs # keep track of all characters
}
else if spec := tab(upto(':')) then {
move(1)
value := tab(0)
if spec == "axiom" then allchars ++:= value
else if spec == "end" then break
/result[spec] := value
}
}
}
# At this point, we have the table to map characters, but it may lack
# mappings for characters that "go into themselves" by default. For
# efficiency in rewriting, these mappings are added.
every c := !allchars do
/rewrite[c] := c
result.productions := rewrite
return result
end
procedure readlsys(input) #: make L-system from a file
local result
result := []
while put(result, read(input))
return makelsys(result)
end
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