projects / OpenSPARC-T2-SAM / blame
| Commit | Line | Data |
|---|---|---|
| 920dae64 AT |
1 | class History: |
| 2 | ||
| 3 | def __init__(self, text, output_sep = "\n"): | |
| 4 | self.text = text | |
| 5 | self.history = [] | |
| 6 | self.history_prefix = None | |
| 7 | self.history_pointer = None | |
| 8 | self.output_sep = output_sep | |
| 9 | text.bind("<<history-previous>>", self.history_prev) | |
| 10 | text.bind("<<history-next>>", self.history_next) | |
| 11 | ||
| 12 | def history_next(self, event): | |
| 13 | self.history_do(0) | |
| 14 | return "break" | |
| 15 | ||
| 16 | def history_prev(self, event): | |
| 17 | self.history_do(1) | |
| 18 | return "break" | |
| 19 | ||
| 20 | def _get_source(self, start, end): | |
| 21 | # Get source code from start index to end index. Lines in the | |
| 22 | # text control may be separated by sys.ps2 . | |
| 23 | lines = self.text.get(start, end).split(self.output_sep) | |
| 24 | return "\n".join(lines) | |
| 25 | ||
| 26 | def _put_source(self, where, source): | |
| 27 | output = self.output_sep.join(source.split("\n")) | |
| 28 | self.text.insert(where, output) | |
| 29 | ||
| 30 | def history_do(self, reverse): | |
| 31 | nhist = len(self.history) | |
| 32 | pointer = self.history_pointer | |
| 33 | prefix = self.history_prefix | |
| 34 | if pointer is not None and prefix is not None: | |
| 35 | if self.text.compare("insert", "!=", "end-1c") or \ | |
| 36 | self._get_source("iomark", "end-1c") != self.history[pointer]: | |
| 37 | pointer = prefix = None | |
| 38 | if pointer is None or prefix is None: | |
| 39 | prefix = self._get_source("iomark", "end-1c") | |
| 40 | if reverse: | |
| 41 | pointer = nhist | |
| 42 | else: | |
| 43 | pointer = -1 | |
| 44 | nprefix = len(prefix) | |
| 45 | while 1: | |
| 46 | if reverse: | |
| 47 | pointer = pointer - 1 | |
| 48 | else: | |
| 49 | pointer = pointer + 1 | |
| 50 | if pointer < 0 or pointer >= nhist: | |
| 51 | self.text.bell() | |
| 52 | if self._get_source("iomark", "end-1c") != prefix: | |
| 53 | self.text.delete("iomark", "end-1c") | |
| 54 | self._put_source("iomark", prefix) | |
| 55 | pointer = prefix = None | |
| 56 | break | |
| 57 | item = self.history[pointer] | |
| 58 | if item[:nprefix] == prefix and len(item) > nprefix: | |
| 59 | self.text.delete("iomark", "end-1c") | |
| 60 | self._put_source("iomark", item) | |
| 61 | break | |
| 62 | self.text.mark_set("insert", "end-1c") | |
| 63 | self.text.see("insert") | |
| 64 | self.text.tag_remove("sel", "1.0", "end") | |
| 65 | self.history_pointer = pointer | |
| 66 | self.history_prefix = prefix | |
| 67 | ||
| 68 | def history_store(self, source): | |
| 69 | source = source.strip() | |
| 70 | if len(source) > 2: | |
| 71 | # avoid duplicates | |
| 72 | try: | |
| 73 | self.history.remove(source) | |
| 74 | except ValueError: | |
| 75 | pass | |
| 76 | self.history.append(source) | |
| 77 | self.history_pointer = None | |
| 78 | self.history_prefix = None | |
| 79 | ||
| 80 | def recall(self, s): | |
| 81 | s = s.strip() | |
| 82 | self.text.tag_remove("sel", "1.0", "end") | |
| 83 | self.text.delete("iomark", "end-1c") | |
| 84 | self.text.mark_set("insert", "end-1c") | |
| 85 | self.text.insert("insert", s) | |
| 86 | self.text.see("insert") |