Re: [Pharo-users] PetitParser problem with plus

With x, x it will only go to 2 level deep. With the plus you allow to go as far as the x rule succeed and your x rule always succeed because notA always succeed due to the star without consuming anything so you fall into infinite loop. 2014-12-18 6:47 GMT+01:00 James Foster <Smalltalk@jgfoster.net>:

There is something about plus that I don’t understand. In the following code if I parse for (x , x) then I get what I expect. If I parse for (x plus) then the image hangs. What am I doing wrong?

James

| a notA x y | a := $a asParser. notA := $a asParser negate star flatten. x := a / notA. y := x , x. “works fine” y := x plus. “never finishes” ^y end parse: 'ab’.

-- *Guillaume Larcheveque*