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|
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 <expression>, 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)
}
# ruby doesn't like floating-point values without a 0
# in front of them, so find any non-digit followed by
# a .<digits> and insert a 0 before the .
expr.gsub!(/(\D|^)(\.\d+)/,'\10\2')
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', $2)))
val.gsub!(/^0+/, "")
expr.gsub!(/#{Regexp.escape exp}/, "+#{val}")
end
expr.gsub!(/ to the power of /, " ** ")
expr.gsub!(/ to the /, " ** ")
expr.gsub!(/\btimes\b/, "*")
expr.gsub!(/\bdiv(ided by)? /, "/ ")
expr.gsub!(/\bover /, "/ ")
expr.gsub!(/\bsquared/, "**2 ")
expr.gsub!(/\bcubed/, "**3 ")
expr.gsub!(/\bto\s+(\d+)(r?st|nd|rd|th)?( power)?/, '**\1 ')
expr.gsub!(/\bpercent of/, "*0.01*")
expr.gsub!(/\bpercent/, "*0.01")
expr.gsub!(/\% of\b/, "*0.01*")
expr.gsub!(/\%/, "*0.01")
expr.gsub!(/\bsquare root of (\d+(\.\d+)?)/, '\1 ** 0.5 ')
expr.gsub!(/\bcubed? root of (\d+(\.\d+)?)/, '\1 **(1.0/3.0) ')
expr.gsub!(/ of /, " * ")
expr.gsub!(/(bit(-| )?)?xor(\'?e?d( with))?/, "^")
expr.gsub!(/(bit(-| )?)?or(\'?e?d( with))?/, "|")
expr.gsub!(/bit(-| )?and(\'?e?d( with))?/, "& ")
expr.gsub!(/(plus|and)/, "+")
debug expr
if (expr =~ /^\s*[-\d*+\s()\/^\.\|\&\*\!]+\s*$/ &&
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.to_s
rescue Exception => e
error 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")
|
