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|
#
# = Exceptions and Errors =
#
# attempting to bring friendlier
# language to the whole thing.
#
class Exception
TRACE_RE = %r!(.+?):(.+?):in `(.+?)':\s*(.*)!
EXCLAMATIONS = ['Oops!', 'Holy cats!', 'By jove,', 'Pardon:',
'Whoops!', 'Great coats!', 'Hot pickles!', 'Hot snacks!',
'Actually:', 'Crikey,', 'Yipes,']
def file
message[TRACE_RE, 1]
end
def line
message[TRACE_RE, 2].to_i
end
def where
message[TRACE_RE, 3]
end
def says
message[TRACE_RE, 4] or message
end
def exclamation
EXCLAMATIONS[rand(EXCLAMATIONS.length)]
end
def token_name t
case t.downcase
when "'['"
"an opening bracket `[`"
when "']'"
"a closing bracket `]`"
when "'('"
"an opening parentheses `(`"
when "')'"
"a closing parentheses `)`"
when "'{'"
"an opening curly brace `{`"
when "'}'"
"a closing curly brace `}`"
when /'(.+?)'/
"a `#$1`"
when "tstar"
"an asterisk"
when /\$end/
"the end of the program"
when /t(.+)/
word = $1
if word =~ /^[aeiou]/
"an #{word}"
else
"a #{word}"
end
when /k(.+)/
word = $1
if word =~ /^[aeiou]/
"an `#{word}`"
else
"a `#{word}`"
end
else
t
end
end
def friendly
s = self.says
msg, xtra =
case self
when LocalJumpError
case s
when "no block given"
["A block is missing."]
else [s]
end
when NoMethodError
case s
when /undefined method `([^']+)' for (.+?):(.+)/
["No `#$1` method found.", "You tried to use the `#$1` method on a #$3 object. (The object was: #{$2})"]
when /private method `(.+?)' called for (.+?):(.+)/
["The `#$1` method is private on #$3.", "Check the help page for #$3 objects."]
else [s]
end
when NameError
case s
when /uninitialized constant (.+)/
"There is nothing called `#$1`."
when /undefined local variable or method `(.+?)'/
"There is nothing called `#$1`."
else [s]
end
when ArgumentError
case s
when /wrong number of arguments \((\d+) for (\d+)\)/
given, needed = $1.to_i, $2.to_i
if given < needed
["The `#{where}` method needs a bit more.", "You sent it #{given} arguments, while it needs #{needed}."]
else
["The `#{where}` method was given too much.", "You gave it #{given} arguments, but it only needs #{needed}."]
end
else [s]
end
when SyntaxError
case s
when /unterminated string meets end of file/
['You are missing an end quote.']
when /unexpected (.+?), expecting (.+)/
t1, t2 = $1, $2
["#{token_name(t2).capitalize} went missing.", "#{token_name(t1).capitalize} was found where #{token_name(t2)} should be."]
when /unexpected (.+)/
if $1 == "\$end"
["This program isn't finished. A block or method was left open."]
else
["#{token_name($1).capitalize} doesn't match up."]
end
else [s]
end
when SocketError
case s
when /no address associated with hostname/
['No such hostname (in `#{where}`.)', 'Is your internet connection okay? Check with a browser.']
else [s]
end
else
[self.class.name, self.says]
end
msg = "= #{exclamation} #{msg} ="
msg += "\n#{xtra}" if xtra
msg
rescue => e
"#{e.class}: #{e.says}"
end
EVAL_TRACE_RE = /^\(eval\):(\d+)/
METH_TRACE_RE = /in `([^']+)'/
def hint
line =
if l = message[TRACE_RE, 2]
l.to_i
elsif backtrace.first
if backtrace.first =~ /in `eval'|^\(eval\):/
if eval_line = backtrace.grep(EVAL_TRACE_RE).first
eval_line[EVAL_TRACE_RE, 1].to_i
end
end
end
if line
"Check line #{line} of your program."
elsif line = backtrace.grep(EVAL_TRACE_RE).first
line = line[EVAL_TRACE_RE, 1]
meth = backtrace.grep(METH_TRACE_RE).last[METH_TRACE_RE, 1]
"The problem appears to be inside the '''#{meth}''' method used on '''line #{line}''' of your program.\n\nThis problem could be Hackety Hack's fault. It'd be good to ask about this problem in the online [[http://talkety.hacketyhack.net forums]]."
end
end
end
|
