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# pass in any argument to assume we are processing for ripper instead

# of the main parser.

IS_RIPPER=!!ARGV.shift

def read_line

line = gets

return nil unless line

line.gsub(/@@([^@]+)@@/) do |word|

sub = SUBS[$1]

raise ArgumentError, "Cannot find substitution for #{word}" unless sub

sub[IS_RIPPER ? 1 : 0]

end

# We define substitutions at the top of the file where a constant

# named SUBS contains a key which represents a subtition and two value

# where the first value is what is substituted when writing the Parser

# and the second value is what is substituted when writing Ripper Parser.

# Any reference to @@name@@ will be replaced with first or second value

# later on in the grammar file.

def read_text_substitutions

code = ''

while line = read_line

break if line =~ %r{^=@@\*/}

code << line

end

# Reads in substitions into the constant SUBS

eval code

end

while line = read_line

if line =~ %r{^/\*@@=}

read_text_substitutions

else

puts line

end