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#
# generate-ripper_rb.rb
# Creates ripper.rb, filling in default event handlers, given a basic
# template, the list of parser events (ids1), and a list of lexer
# events (ids2).
#
def main
template, ids1, ids2 = *ARGV
File.foreach(template) do |line|
case line
when /\A\#include handlers1/
File.foreach(ids1) do |line|
id, arity = line.split
arity = arity.to_i
puts
puts " def on__#{id}(#{argdecl(arity)})"
puts " #{arity == 0 ? 'nil' : 'a'}"
puts " end"
end
when /\A\#include handlers2/
File.foreach(ids2) do |line|
id, arity = line.split
arity = arity.to_i
puts
puts " def on__#{id}(token)"
puts " token"
puts " end"
end
when /\A\#include (.*)/
raise "unknown operation: #include #{$1}"
else
print line
end
end
end
# Generate generic arg list depending on arity (n)
# n:: [Integer] arity of method
def argdecl( n )
%w(a b c d e f g h i j k l m)[0, n].join(', ')
end
main
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