def _read()

in tools/plugins/mboxo_patch.py [0:0]

• 17 lines of code
• 13 McCabe index (conditional complexity)

    def _read(self, size, read_method):
        # get the next chunk, resetting if necessary
        if self.remain != 0:
            super().seek(whence=1, offset=-self.remain)
        # if size is None or negative, then read returns everything.
        # in which case there is no need to wory about matching across reads
        limited_read = size and size >= 0
        # ensure we get enough to match successfully when refilling
        if limited_read and size < FROM_MANGLED_LEN:
            size = FROM_MANGLED_LEN
        buff = super()._read(size, read_method)
        bufflen=len(buff)
        # did we get anything new?
        if limited_read and bufflen > self.remain:
            # is there a potential cross-boundary match?
            if buff.endswith(FROMS):
                # yes, work out what to keep
                # N.B. rindex will fail if it cannot find the LF;
                # this should be impossible
                self.remain=bufflen - buff.rindex(b'\n')
            else:
                # don't need to keep anything back
                self.remain=0
        else:
            # EOF
            self.remain=0
        # we cannot use -0 to mean end of array...
        end = bufflen if self.remain == 0 else -self.remain
        # exclude the potential split match from the return
        return buff[:end].replace(FROM_MANGLED, FROM_UNMANGLED)