class MathPlugin < Plugin @@digits = { "first" => "1", "second" => "2", "third" => "3", "fourth" => "4", "fifth" => "5", "sixth" => "6", "seventh" => "7", "eighth" => "8", "ninth" => "9", "tenth" => "10", "one" => "1", "two" => "2", "three" => "3", "four" => "4", "five" => "5", "six" => "6", "seven" => "7", "eight" => "8", "nine" => "9", "ten" => "10" }; def name "math" end def help(plugin, topic="") "math , evaluate mathematical expression" end def privmsg(m) unless(m.params) m.reply "incorrect usage: " + help(m.plugin) return end expr = m.params.dup @@digits.each {|k,v| expr.gsub!(/\b#{k}\b/, v) } while expr =~ /(exp ([\w\d]+))/ exp = $1 val = Math.exp($2).to_s expr.gsub!(/#{Regexp.escape exp}/, "+#{val}") end while expr =~ /^\s*(dec2hex\s*(\d+))\s*\?*/ exp = $1 val = sprintf("%x", $2) expr.gsub!(/#{Regexp.escape exp}/, "+#{val}") end expr.gsub(/\be\b/, Math.exp(1).to_s) while expr =~ /(log\s*((\d+\.?\d*)|\d*\.?\d+))\s*/ exp = $1 res = $2 if res == 0 val = "Infinity" else val = Math.log(res).to_s end expr.gsub!(/#{Regexp.escape exp}/, "+#{val}") end while expr =~ /(bin2dec ([01]+))/ exp = $1 val = join('', unpack('B*', pack('N', $2))) val.gsub!(/^0+/, "") expr.gsub!(/#{Regexp.escape exp}/, "+#{val}") end expr.gsub!(/ to the power of /, " ** ") expr.gsub!(/ to the /, " ** ") expr.gsub!(/\btimes\b/, "*") expr.gsub!(/\bdiv(ided by)? /, "/ ") expr.gsub!(/\bover /, "/ ") expr.gsub!(/\bsquared/, "**2 ") expr.gsub!(/\bcubed/, "**3 ") expr.gsub!(/\bto\s+(\d+)(r?st|nd|rd|th)?( power)?/, "**\1 ") expr.gsub!(/\bpercent of/, "*0.01*") expr.gsub!(/\bpercent/, "*0.01") expr.gsub!(/\% of\b/, "*0.01*") expr.gsub!(/\%/, "*0.01") expr.gsub!(/\bsquare root of (\d+)/, "\1 ** 0.5 ") expr.gsub!(/\bcubed? root of (\d+)/, "\1 **(1.0/3.0) ") expr.gsub!(/ of /, " * ") expr.gsub!(/(bit(-| )?)?xor(\'?e?d( with))?/, "^") expr.gsub!(/(bit(-| )?)?or(\'?e?d( with))?/, "|") expr.gsub!(/bit(-| )?and(\'?e?d( with))?/, "& ") expr.gsub!(/(plus|and)/, "+") if (expr =~ /^\s*[-\d*+\s()\/^\.\|\&\*\!]+\s*$/ && expr !~ /^\s*\(?\d+\.?\d*\)?\s*$/ && expr !~ /^\s*$/ && expr !~ /^\s*[( )]+\s*$/) begin debug "evaluating expression \"#{expr}\"" answer = eval(expr) if answer =~ /^[-+\de\.]+$/ answer = sprintf("%1.12f", answer) answer.gsub!(/\.?0+$/, "") answer.gsub!(/(\.\d+)000\d+/, '\1') if (answer.length > 30) answer = "a number with >30 digits..." end end m.reply answer rescue Exception => e puts "couldn't evaluate expression \"#{m.params}\": #{e}" m.reply "illegal expression \"#{m.params}\"" return end else m.reply "illegal expression \"#{m.params}\"" return end end end plugin = MathPlugin.new plugin.register("math") plugin.register("maths")