Ring buffer used as undobuffer for RawTurtle objects.
| 906 | |
| 907 | |
| 908 | class Tbuffer(object): |
| 909 | """Ring buffer used as undobuffer for RawTurtle objects.""" |
| 910 | def __init__(self, bufsize=10): |
| 911 | self.bufsize = bufsize |
| 912 | self.buffer = [[None]] * bufsize |
| 913 | self.ptr = -1 |
| 914 | self.cumulate = False |
| 915 | def reset(self, bufsize=None): |
| 916 | if bufsize is None: |
| 917 | for i in range(self.bufsize): |
| 918 | self.buffer[i] = [None] |
| 919 | else: |
| 920 | self.bufsize = bufsize |
| 921 | self.buffer = [[None]] * bufsize |
| 922 | self.ptr = -1 |
| 923 | def push(self, item): |
| 924 | if self.bufsize > 0: |
| 925 | if not self.cumulate: |
| 926 | self.ptr = (self.ptr + 1) % self.bufsize |
| 927 | self.buffer[self.ptr] = item |
| 928 | else: |
| 929 | self.buffer[self.ptr].append(item) |
| 930 | def pop(self): |
| 931 | if self.bufsize > 0: |
| 932 | item = self.buffer[self.ptr] |
| 933 | if item is None: |
| 934 | return None |
| 935 | else: |
| 936 | self.buffer[self.ptr] = [None] |
| 937 | self.ptr = (self.ptr - 1) % self.bufsize |
| 938 | return (item) |
| 939 | def nr_of_items(self): |
| 940 | return self.bufsize - self.buffer.count([None]) |
| 941 | def __repr__(self): |
| 942 | return str(self.buffer) + " " + str(self.ptr) |
| 943 | |
| 944 | |
| 945 |
no outgoing calls
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