On Sun, 22 Jul 2007 03:50:01 -0400, Bil K. wrote:
myrect.rb:8: syntax error, unexpected kNOT, expecting kEND
return not ((other.x1 < self.x0 or self.x1 < other.x0) and
You need to use the ‘!’ operator instead of the ‘not’ “conjunction”.
It’s a precedence thing – the parser is seeing ‘return not’ – see
parse.y in the source.
Thanks, maybe I’ll look. It’s not just precedence though, or else
‘return’ itself is part of it:
def ok
return (not true)
end
def fails
return not true
end
And note that within an ‘if’, it works as you’d expect:
def with_parens_ok
if (not true)
puts “not true”
end
end
def no_parens_ok
if not true
puts “not true”
end
end
On 7/22/07, Good Night M. [email protected] wrote:
On Sun, 22 Jul 2007 03:50:01 -0400, Bil K. wrote:
myrect.rb:8: syntax error, unexpected kNOT, expecting kEND
return not ((other.x1 < self.x0 or self.x1 < other.x0) and
You need to use the ‘!’ operator instead of the ‘not’ “conjunction”.
It’s a precedence thing – the parser is seeing ‘return not’ – see
parse.y in the source.
Thanks, maybe I’ll look. It’s not just precedence though, or else
‘return’ itself is part of it:
if binds differently than return. It is precedence.
On 7/22/07, Gregory B. [email protected] wrote:
‘return’ itself is part of it:
if binds differently than return. It is precedence.
Except that return isn’t an operator. As far as I can tell, looking
at parse.y for ruby1.8.6 the parse tree for the original statement
which raised the question
return not true
should be:
command_call
kRETURN expr
kNOT expr
primary
var_ref
variable
kTRUE
There definitely looks to be something strange here.
–
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/