Re: [Haskell-cafe] Safe 'chr' function?
Alternatively, is there a way to know ahead of time whether or not an Int will cause 'chr' to throw an exception? since Char is in instance of 'Bounded' as well as 'Enum' wouldn't fromEnum (maxBound :: Char) give the max value of Int for which a valid char exists? On Thu, Jan 3, 2013 at 1:20 PM, Myles C. Maxfield myles.maxfi...@gmail.comwrote: Hello, I'm working on a general text-processing library [1] and one of my quickcheck tests is designed to make sure that my library doesn't throw exceptions (it returns an Either type on failure). However, there are some inputs that cause me to pass bogus values to the 'chr' function (such as 1208914), which causes it to throw an exception. Is there a version of that function that is safe? (I'm hoping for something like Int - Maybe Char). Alternatively, is there a way to know ahead of time whether or not an Int will cause 'chr' to throw an exception? Thanks, Myles C. Maxfield [1] http://hackage.haskell.org/package/punycode ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- I drink I am thunk. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Safe 'chr' function?
You could wrap chr with a call to spoon[1]. It's not the most elegant solution, but it works. [1] http://hackage.haskell.org/packages/archive/spoon/0.3/doc/html/Control-Spoon.html#v:spoon On Thu, Jan 3, 2013 at 9:50 AM, Myles C. Maxfield myles.maxfi...@gmail.comwrote: Hello, I'm working on a general text-processing library [1] and one of my quickcheck tests is designed to make sure that my library doesn't throw exceptions (it returns an Either type on failure). However, there are some inputs that cause me to pass bogus values to the 'chr' function (such as 1208914), which causes it to throw an exception. Is there a version of that function that is safe? (I'm hoping for something like Int - Maybe Char). Alternatively, is there a way to know ahead of time whether or not an Int will cause 'chr' to throw an exception? Thanks, Myles C. Maxfield [1] http://hackage.haskell.org/package/punycode ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Safe 'chr' function?
Thanks you two for your answers. Consider this issue closed now :-) --Myles On Thu, Jan 3, 2013 at 12:05 AM, Michael Snoyman mich...@snoyman.comwrote: You could wrap chr with a call to spoon[1]. It's not the most elegant solution, but it works. [1] http://hackage.haskell.org/packages/archive/spoon/0.3/doc/html/Control-Spoon.html#v:spoon On Thu, Jan 3, 2013 at 9:50 AM, Myles C. Maxfield myles.maxfi...@gmail.com wrote: Hello, I'm working on a general text-processing library [1] and one of my quickcheck tests is designed to make sure that my library doesn't throw exceptions (it returns an Either type on failure). However, there are some inputs that cause me to pass bogus values to the 'chr' function (such as 1208914), which causes it to throw an exception. Is there a version of that function that is safe? (I'm hoping for something like Int - Maybe Char). Alternatively, is there a way to know ahead of time whether or not an Int will cause 'chr' to throw an exception? Thanks, Myles C. Maxfield [1] http://hackage.haskell.org/package/punycode ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Safe 'chr' function?
Hello, I'm working on a general text-processing library [1] and one of my quickcheck tests is designed to make sure that my library doesn't throw exceptions (it returns an Either type on failure). However, there are some inputs that cause me to pass bogus values to the 'chr' function (such as 1208914), which causes it to throw an exception. Is there a version of that function that is safe? (I'm hoping for something like Int - Maybe Char). Alternatively, is there a way to know ahead of time whether or not an Int will cause 'chr' to throw an exception? Thanks, Myles C. Maxfield [1] http://hackage.haskell.org/package/punycode ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
