Add wxArrayString pretty printer for gdb

Closes #18276.

misc/gdb/print.py

@@ -14,6 +14,20 @@
 # in wxLookupFunction at the bottom of this file.
 
 import datetime
+import gdb
+import itertools
+import sys
+
+if sys.version_info[0] > 2:
+    # Python 3
+    Iterator = object
+
+    long = int
+else:
+    # Python 2, we need to make an adaptor, so we can use Python 3 iterator implementations.
+    class Iterator:
+        def next(self):
+            return self.__next__()
 
 # shamelessly stolen from std::string example
 class wxStringPrinter:
@@ -26,6 +40,41 @@ class wxStringPrinter:
     def display_hint(self):
         return 'string'
 
+class wxArrayStringPrinter:
+
+    class _iterator(Iterator):
+        def __init__ (self, firstItem, count):
+            self.item = firstItem
+            self.count = count
+            self.current = 0
+
+        def __iter__(self):
+            return self
+
+        def __next__(self):
+            current = self.current
+            self.current = self.current + 1
+
+            if current == self.count:
+                raise StopIteration
+            elt = self.item.dereference()
+            self.item = self.item + 1
+            return ('[%d]' % current, elt)
+
+    def __init__(self, val):
+        self.val = val
+
+    def children(self):
+        return self._iterator(self.val['m_pItems'], self.val['m_nCount'])
+
+    def to_string(self):
+        count = self.val['m_nCount']
+        capacity = self.val['m_nSize']
+        return ('length %d, capacity %d' % (int (count), int (capacity)))
+
+    def display_hint(self):
+        return 'array'
+
 class wxDateTimePrinter:
     def __init__(self, val):
         self.val = val
@@ -81,6 +130,7 @@ def wxLookupFunction(val):
     # Using a list is probably ok for so few items but consider switching to a
     # set (or a dict and cache class types as the keys in it?) if needed later.
     types = ['wxString',
+             'wxArrayString',
              'wxDateTime',
              'wxFileName',
              'wxPoint',