1 files changed, 74 insertions, 0 deletions
diff --git a/tests/stdlib/tstrset.nim b/tests/stdlib/tstrset.nim
new file mode 100644
index 000000000..9cdb5ed35
--- /dev/null
+++ b/tests/stdlib/tstrset.nim
@@ -0,0 +1,74 @@
+# test a simple yet highly efficient set of strings
+
+type
+  TRadixNodeKind = enum rnLinear, rnFull, rnLeaf
+  PRadixNode = ref TRadixNode
+  TRadixNode = object {.inheritable.}
+    kind: TRadixNodeKind
+  TRadixNodeLinear = object of TRadixNode
+    len: int8
+    keys: array [0..31, char]
+    vals: array [0..31, PRadixNode]  
+  TRadixNodeFull = object of TRadixNode
+    b: array [char, PRadixNode]
+  TRadixNodeLeaf = object of TRadixNode
+    s: string
+  PRadixNodeLinear = ref TRadixNodeLinear
+  PRadixNodeFull = ref TRadixNodeFull
+  PRadixNodeLeaf = ref TRadixNodeLeaf
+    
+proc search(r: PRadixNode, s: string): PRadixNode =
+  var r = r
+  var i = 0
+  while r != nil:
+    case r.kind
+    of rnLinear:
+      var x = PRadixNodeLinear(r)
+      for j in 0..ze(x.len)-1:
+        if x.keys[j] == s[i]:
+          if s[i] == '\0': return r
+          r = x.vals[j]
+          inc(i)
+          break
+      break # character not found
+    of rnFull:
+      var x = PRadixNodeFull(r)
+      var y = x.b[s[i]]
+      if s[i] == '\0':
+        return if y != nil: r else: nil
+      r = y
+      inc(i)
+    of rnLeaf:
+      var x = PRadixNodeLeaf(r)
+      var j = 0
+      while true:
+        if x.s[j] != s[i]: return nil
+        if s[i] == '\0': return r
+        inc(j)
+        inc(i)
+
+proc contains*(r: PRadixNode, s: string): bool =
+  return search(r, s) != nil
+
+proc testOrincl*(r: var PRadixNode, s: string): bool =
+  nil
+    
+proc incl*(r: var PRadixNode, s: string) = discard testOrIncl(r, s)
+
+proc excl*(r: var PRadixNode, s: string) =
+  var x = search(r, s)
+  if x == nil: return
+  case x.kind
+  of rnLeaf: PRadixNodeLeaf(x).s = ""
+  of rnFull: PRadixNodeFull(x).b['\0'] = nil
+  of rnLinear:
+    var x = PRadixNodeLinear(x)
+    for i in 0..ze(x.len)-1:
+      if x.keys[i] == '\0':
+        swap(x.keys[i], x.keys[ze(x.len)-1])
+        dec(x.len)
+        break
+
+var
+  root: PRadixNode
+