[PATCH] decodetree: Allow use of hex/bin format for argument field values

[Philippe Mathieu-Daudé]

ISA datasheets often use binary or hexadecimal constant values.
By doing base conversion, we might introduce bugs. Safer is to
copy/paste the datasheet value.
Add support for bin/hex constants in argument field token.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
Is there a more pythonic way to write this if/elif/else
loop without re.fullmatch?
---
 scripts/decodetree.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/decodetree.py b/scripts/decodetree.py
index 47aa9caf6d1..d2ecc61813f 100644
--- a/scripts/decodetree.py
+++ b/scripts/decodetree.py
@@ -849,9 +849,15 @@ def parse_generic(lineno, parent_pat, name, toks):
             continue
 
         # 'Foo=number' sets an argument field to a constant value
-        if re.fullmatch(re_C_ident + '=[+-]?[0-9]+', t):
+        if re.fullmatch(re_C_ident + '=[+-]?(0[bx])?[0-9]+', t):
             (fname, value) = t.split('=')
-            value = int(value)
+            if re.fullmatch('[+-]?0b[0-9]+', value):
+                base = 2
+            elif re.fullmatch('[+-]?0x[0-9]+', value):
+                base = 16
+            else:
+                base = 10
+            value = int(value, base)
             flds = add_field(lineno, flds, fname, ConstField(value))
             continue
 
-- 
2.26.2