Lua solution for week 99, part 1

2 files changed, 48 insertions, 0 deletions

diff --git a/challenge-099/abigail/README.md b/challenge-099/abigail/README.md
index 3e98f336de..159a51bf25 100644
--- a/challenge-099/abigail/README.md
+++ b/challenge-099/abigail/README.md
@@ -42,6 +42,7 @@ Output: 1
 ### Solutions
 * [AWK](awk/ch-1.awk)
 * [C](c/ch-1.c)
+* [Lua](lua/ch-1.lua)
 * Perl
     * [Using regular expressions](perl/ch-1.pl)
     * [Recursion](perl/ch-1a.pl)
diff --git a/challenge-099/abigail/lua/ch-1.lua b/challenge-099/abigail/lua/ch-1.lua
new file mode 100644
index 0000000000..fc40672471
--- /dev/null
+++ b/challenge-099/abigail/lua/ch-1.lua
@@ -0,0 +1,47 @@
+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-1.lua < input-file
+--
+
+for line in io . lines () do
+    --
+    -- Extract the string and pattern
+    --
+    local str, pattern = line : match ("(%S+) +(%S+)")
+
+    --
+    -- Turn the pattern into a Lua pattern, replace any
+    -- character c:
+    --    if c == "?"             ->  .
+    --    if c == "*"             ->  .*
+    --    if c is not an alpanum  -> %c
+    --    otherwise, keep c as is
+    -- And then add anchors
+    --
+    pattern = pattern : gsub (".", function (c)
+        local result = c
+        if c == "?" then
+            result = "."
+        elseif c == "*" then
+            result = ".*"
+        elseif c : match ("%W") then
+            result = "%" .. c
+        end
+        return result
+    end)
+    pattern = "^" .. pattern .. "$"
+
+    --
+    -- Print 1/0 depending whether we have a match or not.
+    --
+    if (str : match (pattern)) then
+        print (1)
+    else 
+        print (0)
+    end
+end