On Jul 29, 2011, at 6:04 AM, Rick DeNatale wrote: > On Thu, Jul 28, 2011 at 1:04 PM, David Chelimsky <dchelim...@gmail.com> wrote: > On Jul 28, 2011, at 11:40 AM, Roger Pack wrote: > > >>> 'abc' ~! /def/ > > => true > > > > 'abc'.should !~ /def/ > > > > fails though. Seemed unexpected... > > -roger- > > This comes up from time to time but it's a bitch to google for. It boils down > to this: the only way to support "actual.should != unexpected" in Ruby 1.8 is > to go back and parse the file. This is because == is a method but != is not a > method: it's handled by the parser. What that means is this: > > 5.should == 5 > # becomes > 5.should.==(5) > > 5.should != 4 > # becomes > !(5.should.==(4)) > > In the latter case the code evaluating 5 == 4 has no way to know that it's > been negated. > > HTH, > David > > All true David, but you might want to get your eyeglass prescription checked, > or maybe you glossed over the difference between = and ~.
Probably a bit of both :) > Roger is using != but !~ which is the negated form of ~=, although I think > !~ uses the same kind of compile time expansion as !=. That appears to be the case. > And then, Roger is trying to transpose the characters to ~! which is > syntactically incorrect sugar. Although this might be a typo in the post. > > → irb > >> 'abc' !~ /def/ > => true > >> 'abc' ~! /def/ > SyntaxError: compile error > (irb):2: syntax error, unexpected '~', expecting $end > 'abc' ~! /def/ > ^ > from (irb):2 > > > > And of course the solution is to use should_not > > 'abc'.should_not =~ /def/ > or > 'abc'.should_not match(/def/) I prefer the latter, which leads me to prefer 'abc'.should match(/bc/) as well. Thanks for setting things straight. Cheers, David > -- > Rick DeNatale > > Blog: http://talklikeaduck.denhaven2.com/ > Github: http://github.com/rubyredrick > Twitter: @RickDeNatale > WWR: http://www.workingwithrails.com/person/9021-rick-denatale > LinkedIn: http://www.linkedin.com/in/rickdenatale
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