def _span ( typw ):
"""
count chars available for wildcard match
arguments:
typw - wildcard
returns:
non-negative count if any match possible, otherwise -1
"""
k = minMatch(patn[mp:]) # calculate min char count to match rest of pattern
# print "exclude=",k,"@",offs
# calculate maximum chars a wildcard can match
mx = ellyChar.findBreak(text,offs) - k # max span reduced by exclusion
if mx < 0: return -1 # cannot match if max span < 0
tfn = Matching[typw] # char type matching a wildcard
# print "text at",offs,"maximum wildcard match=",mx
nm = 0
for i in range(mx):
c = text[offs+i] # next char in text from offset
if not tfn(c): break # stop when it fails to match
nm += 1
# print "maximum wildcard span=",nm
return nm
def findBreak ( self ):
"""
look for next token break in buffer
arguments:
self
returns:
remaining char count in buffer if no break is found
otherwise, count of chars to next break if nonzero, but 1 if zero,
"""
if len(self.buffer) == 0:
return 0
if self.buffer[0] == APO:
return 1
k = ellyChar.findBreak(self.buffer)
# print 'findBreak k=' , k
if k > 2 and self.buffer[k-1] in [ APO , APX ]:
k -= 1
if k > 2 and self.buffer[k-1] in [ APO , APX , COM , DOT ]:
k -= 1
self.index = k
return k
def findBreak ( self ):
"""
look for next token break in buffer
arguments:
self
returns:
remaining char count in buffer if no break is found
otherwise, count of chars to next break if nonzero, but 1 if zero,
"""
k = ellyChar.findBreak(self.buffer)
self.index = k
return k
