Matt Wette wrote:
> I am having difficulty doing this cleanly in python. Can anyone help?
>
> rx1 = re.compile(r'struct {')
> rx2 = re.compile(r'typedef struct {')
> rx3 = re.compile(r'something else')
>
> m = rx1.match(line)
> if m:
> do something
> else:
> m = rx2.match(line)
> if m:
> do something
> else:
> m = rx3.match(line)
> if m:
> do something
> else:
> error
>
> (In Scheme I was able to do this cleanly with macros.)
My preferred way to do this is something like this:
import re
RX = re.compile(r'''
(?P<rx1> struct\s{ )|
(?P<rx2> typedef\sstruct\s{ )|
(?P<rx3> something\selse )
''', re.VERBOSE)
class Matcher:
def rx1(self, m):
print "rx1 matched", m.group(0)
def rx2(self, m):
print "rx2 matched", m.group(0)
def rx3(self, m):
print "rx3 matched", m.group(0)
def processLine(self, line):
m = RX.match(line)
if m:
getattr(self, m.lastgroup)(m)
else:
print "error",repr(line),"did not match"
matcher = Matcher()
matcher.processLine('struct { something')
matcher.processLine('typedef struct { something')
matcher.processLine('something else')
matcher.processLine('will not match')
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