add start of hostmask matching: mask collapsing

ircrobots/glob.py

@@ -0,0 +1,20 @@
+
+def _collapse(pattern: str) -> str:
+    out = ""
+    i = 0
+    while i < len(pattern):
+        seen_ast = False
+        while pattern[i:] and pattern[i] in ["*", "?"]:
+            if pattern[i] == "?":
+                out += "?"
+            elif pattern[i] == "*":
+                seen_ast = True
+            i += 1
+        if seen_ast:
+            out += "*"
+
+        if pattern[i:]:
+            out += pattern[i]
+            i   += 1
+    return out
+

test/__init__.py

@@ -0,0 +1 @@
+from .glob import *

test/glob.py

@@ -0,0 +1,16 @@
+import unittest
+from ircrobots import glob
+
+class GlobTestCollapse(unittest.TestCase):
+    def test(self):
+        c1 = glob._collapse("**?*")
+        self.assertEqual(c1, "?*")
+
+        c2 = glob._collapse("a**?a*")
+        self.assertEqual(c2, "a?*a*")
+
+        c3 = glob._collapse("?*?*?*?*a")
+        self.assertEqual(c3, "????*a")
+
+        c4 = glob._collapse("a*?*a?**")
+        self.assertEqual(c4, "a?*a?*")