From 3c4ac7d6191f6a1dcc9218dfffa17ec7e491acde Mon Sep 17 00:00:00 2001 From: Jan Sucan Date: Sat, 22 Apr 2023 16:27:28 +0200 Subject: 8_a_1: Add solution --- ch08/8_a_1.hs | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 ch08/8_a_1.hs (limited to 'ch08/8_a_1.hs') diff --git a/ch08/8_a_1.hs b/ch08/8_a_1.hs new file mode 100644 index 0000000..d918b6d --- /dev/null +++ b/ch08/8_a_1.hs @@ -0,0 +1,23 @@ +-- Use ghci to explore what happens if you pass a malformed pattern, such as [, +-- to globToRegex. Write a small function that calls globToRegex, and pass it a +-- malformed pattern. What happens? + +-- When trying to load the GlobRegex.hs file into ghci, I got an error about +-- that the module was not found. I used Hoogle (https://hoogle.haskell.org/) to +-- search for Text.Regex.Posix module and found it was in regex-posix package. I +-- use stack, so I installed the package by +-- +-- stack install regex-posix + +import GlobRegex + +callGlobToRegex glob = globToRegex glob + +-- ghci> :l 8_a_1.hs +-- [1 of 2] Compiling GlobRegex ( GlobRegex.hs, interpreted ) +-- [2 of 2] Compiling Main ( 8_a_1.hs, interpreted ) +-- Ok, two modules loaded. +-- ghci> callGlobToRegex "[" +-- "^*** Exception: unterminated character class +-- CallStack (from HasCallStack): +-- error, called at ./GlobRegex.hs:27:31 in main:GlobRegex -- cgit v1.2.3