X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FCidr.hs;h=422a0adf076216f16b128791a610eee54fc9ca42;hb=9200fe5fcab505e5a331514a6ee687c6f78011b1;hp=8fc014f6cf5b062f8ae019d3b990c22a9604e9b8;hpb=a3c4fbd855c182390f39cdf88de36d7cb0ea69d5;p=hath.git

diff --git a/src/Cidr.hs b/src/Cidr.hs
index 8fc014f..422a0ad 100644
--- a/src/Cidr.hs
+++ b/src/Cidr.hs
@@ -31,7 +31,7 @@ import Octet
 
 data Cidr = None | Cidr { ipv4address :: IPv4Address,
                           maskbits :: Maskbits }
-            deriving (Eq)
+
 
 
 instance Show Cidr where
@@ -45,7 +45,9 @@ instance Arbitrary Cidr where
       mask <- arbitrary :: Gen Maskbits
       return (Cidr ipv4 mask)
 
-    coarbitrary _ = variant 0
+
+instance Eq Cidr where
+  cidr1 == cidr2 = (cidr1 `equivalent` cidr2)
 
 
 -- Two CIDR ranges are equivalent if they have the same network bits
@@ -60,8 +62,11 @@ equivalent (Cidr addr1 mbits1) (Cidr addr2 mbits2) =
 -- Returns the mask portion of a CIDR address. That is, everything
 -- after the trailing slash.
 maskbits_from_cidr_string :: String -> Maskbits
-maskbits_from_cidr_string s =
-    maskbits_from_string ((splitWith (`elem` "/") s) !! 1)
+maskbits_from_cidr_string s
+    | length partlist == 2 = maskbits_from_string (partlist !! 1)
+    | otherwise = Maskbits.None
+      where
+        partlist = (splitWith (`elem` "/") s)
 
 
 -- Takes an IP address String in CIDR notation, and returns a list of
@@ -191,9 +196,15 @@ redundant cidrlist cidr = any ((flip contains_proper) cidr) cidrlist
 -- adjacent Cidrs are combined into a larger one, they will be removed
 -- in the second step since the larger Cidr must contain the smaller
 -- two.
+--
+-- Once this is done, we see whether or not the result is different
+-- than the argument that was passed in. If nothing changed, we're
+-- done and return the list that was passed to us. However, if
+-- something changed, we recurse and try to combine the list again.
 combine_all :: [Cidr] -> [Cidr]
-combine_all cidrs =
-    combine_contained unique_cidrs
+combine_all cidrs
+  | cidrs == (combine_contained unique_cidrs) = cidrs
+  | otherwise = combine_all (combine_contained unique_cidrs)
     where
       unique_cidrs = nubBy equivalent valid_cidr_combinations
       valid_cidr_combinations = filter (/= Cidr.None) cidr_combinations
@@ -242,6 +253,22 @@ adjacent cidr1 cidr2
 
 -- HUnit Tests
 
+test_min_host1 :: Test
+test_min_host1 =
+    TestCase $ assertEqual "The minimum host in 10.0.0.0/24 is 10.0.0.0" expected actual
+    where
+      actual = show $ min_host (cidr_from_string "10.0.0.0/24")
+      expected = "10.0.0.0"
+
+
+test_max_host1 :: Test
+test_max_host1 =
+    TestCase $ assertEqual "The maximum host in 10.0.0.0/24 is 10.0.0.255" expected actual
+    where
+      actual = show $ max_host (cidr_from_string "10.0.0.0/24")
+      expected = "10.0.0.255"
+
+
 test_equality1 :: Test
 test_equality1 =
     TestCase $ assertEqual "10.1.1.0/23 equals itself" True (cidr1 == cidr1)
@@ -339,8 +366,8 @@ test_combine_all1 =
       cidr3 = cidr_from_string "10.0.2.0/24"
       cidr4 = cidr_from_string "10.0.3.0/23"
       cidr5 = cidr_from_string "10.0.0.0/23"
-      expected_cidrs = [cidr4, cidr5]
-      test_cidrs = [cidr1, cidr2, cidr3, cidr4]
+      expected_cidrs = [cidr_from_string "10.0.0.0/22"]
+      test_cidrs = [cidr1, cidr2, cidr3, cidr4, cidr5]
 
 
 test_combine_all2 :: Test
@@ -352,8 +379,22 @@ test_combine_all2 =
       test_cidrs = [cidr1, cidr1, cidr1, cidr1, cidr1]
 
 
+test_combine_all3 :: Test
+test_combine_all3 =
+    TestCase $ assertEqual "10.0.0.16, 10.0.0.17, 10.0.0.18, and 10.0.0.19 get combined into 10.0.0.16/30" expected_cidrs (combine_all test_cidrs)
+    where
+      cidr1 = cidr_from_string "10.0.0.16/32"
+      cidr2 = cidr_from_string "10.0.0.17/32"
+      cidr3 = cidr_from_string "10.0.0.18/32"
+      cidr4 = cidr_from_string "10.0.0.19/32"
+      expected_cidrs = [cidr_from_string "10.0.0.16/30"]
+      test_cidrs = [cidr1, cidr2, cidr3, cidr4]
+
+
 cidr_tests :: [Test]
-cidr_tests = [ test_equality1,
+cidr_tests = [ test_min_host1,
+               test_max_host1,
+               test_equality1,
                test_contains1,
                test_contains2,
                test_contains_proper1,
@@ -365,7 +406,8 @@ cidr_tests = [ test_equality1,
                test_combine_contained1,
                test_combine_contained2,
                test_combine_all1,
-               test_combine_all2
+               test_combine_all2,
+               test_combine_all3
              ]