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Expand negative hexadecimal constants.

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This commit is contained in:
Martin v. Löwis 2002-11-23 12:08:10 +00:00
parent b2c7affbaa
commit dab3bc05f3
1 changed files with 25 additions and 9 deletions
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34
Tools/scripts/h2py.py
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@ -38,6 +38,8 @@ ignores = [p_comment, p_cpp_comment]
p_char = re.compile(r"'(\\.[^\\]*|[^\\])'")
p_hex = re.compile(r"0x([0-9a-fA-F]+)L?")
filedict = {}
importable = {}
@ -88,6 +90,26 @@ def main():
outfp.close()
fp.close()
def pytify(body):
# replace ignored patterns by spaces
for p in ignores:
body = p.sub(' ', body)
# replace char literals by ord(...)
body = p_char.sub('ord(\\0)', body)
# Compute negative hexadecimal constants
start = 0
UMAX = 2*(sys.maxint+1)
while 1:
m = p_hex.search(body, start)
if not m: break
s,e = m.span()
val = long(body[slice(*m.span(1))], 16)
if val > sys.maxint:
val -= UMAX
body = body[:s] + "(" + str(val) + ")" + body[e:]
start = s + 1
return body
def process(fp, outfp, env = {}):
lineno = 0
while 1:
@ -104,13 +126,9 @@ def process(fp, outfp, env = {}):
line = line + nextline
name = match.group(1)
body = line[match.end():]
# replace ignored patterns by spaces
for p in ignores:
body = p.sub(' ', body)
# replace char literals by ord(...)
body = p_char.sub('ord(\\0)', body)
stmt = '%s = %s\n' % (name, body.strip())
body = pytify(body)
ok = 0
stmt = '%s = %s\n' % (name, body.strip())
try:
exec stmt in env
except:
@ -121,9 +139,7 @@ def process(fp, outfp, env = {}):
if match:
macro, arg = match.group(1, 2)
body = line[match.end():]
for p in ignores:
body = p.sub(' ', body)
body = p_char.sub('ord(\\0)', body)
body = pytify(body)
stmt = 'def %s(%s): return %s\n' % (macro, arg, body)
try:
exec stmt in env