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ruby--ruby/sample/eval.rb

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line = ''
indent=0
$stdout.sync = TRUE
print "ruby> "
while TRUE
l = gets
unless l
break if line == ''
else
line = line + l
if l =~ /,\s*$/
print "ruby| "
next
end
if l =~ /^\s*(class|module|def|if|case|while|for|begin)\b[^_]/
indent += 1
end
if l =~ /^\s*end\b[^_]/
indent -= 1
end
if l =~ /\{\s*(\|.*\|)?\s*$/
indent += 1
end
if l =~ /^\s*\}/
indent -= 1
end
if indent > 0
print "ruby| "
next
end
end
begin
print eval(line).inspect, "\n"
rescue
$! = 'exception raised' unless $!
print "ERR: ", $!, "\n"
end
break if not l
line = ''
print "ruby> "
end
print "\n"