Add generic fast type decoder

Author: mborland

extra/decimal_printer.py

@@ -5,6 +5,7 @@
 from detail.decode_decimal32 import decode_decimal32
 from detail.decode_decimal64 import decode_decimal64
 from detail.decode_decimal128 import decode_decimal128
+from detail.decode_fast_type import decode_fast_type
 import lldb
 
 def decimal32_summary(valobj, internal_dict):

extra/detail/decode_fast_type.py

@@ -0,0 +1,9 @@
+# Copyright 2025 Matt Borland
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+from generate_string import generate_string
+
+def decode_fast_type(significand, exp, sign):
+    return generate_string(significand, exp, sign)
+    

extra/detail/generate_string.py

@@ -0,0 +1,19 @@
+# Copyright 2025 Matt Borland
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+def generate_string(significand, exp, sign):
+    if significand == 0:
+        result = "0.0e+0"
+    else:
+        sig_str = str(significand)
+        n_digits = len(sig_str)
+        if n_digits == 1:
+            normalized_str = sig_str
+            total_exp = exp
+        else:
+            normalized_str = sig_str[0] + '.' + sig_str[1:]
+            total_exp = exp + n_digits - 1
+        result = f"{'-' if sign else ''}{normalized_str}e{total_exp:+}"
+
+    return result