| David Scherer | 7aced17 | 2000-08-15 01:13:23 +0000 | [diff] [blame] | 1 | import string |
| 2 | |
| 3 | class History: |
| 4 | |
| 5 | def __init__(self, text, output_sep = "\n"): |
| 6 | self.text = text |
| 7 | self.history = [] |
| 8 | self.history_prefix = None |
| 9 | self.history_pointer = None |
| 10 | self.output_sep = output_sep |
| 11 | text.bind("<<history-previous>>", self.history_prev) |
| 12 | text.bind("<<history-next>>", self.history_next) |
| 13 | |
| 14 | def history_next(self, event): |
| 15 | self.history_do(0) |
| 16 | return "break" |
| 17 | |
| 18 | def history_prev(self, event): |
| 19 | self.history_do(1) |
| 20 | return "break" |
| 21 | |
| 22 | def _get_source(self, start, end): |
| 23 | # Get source code from start index to end index. Lines in the |
| 24 | # text control may be separated by sys.ps2 . |
| 25 | lines = string.split(self.text.get(start, end), self.output_sep) |
| 26 | return string.join(lines, "\n") |
| 27 | |
| 28 | def _put_source(self, where, source): |
| 29 | output = string.join(string.split(source, "\n"), self.output_sep) |
| 30 | self.text.insert(where, output) |
| 31 | |
| 32 | def history_do(self, reverse): |
| 33 | nhist = len(self.history) |
| 34 | pointer = self.history_pointer |
| 35 | prefix = self.history_prefix |
| 36 | if pointer is not None and prefix is not None: |
| 37 | if self.text.compare("insert", "!=", "end-1c") or \ |
| 38 | self._get_source("iomark", "end-1c") != self.history[pointer]: |
| 39 | pointer = prefix = None |
| 40 | if pointer is None or prefix is None: |
| 41 | prefix = self._get_source("iomark", "end-1c") |
| 42 | if reverse: |
| 43 | pointer = nhist |
| 44 | else: |
| 45 | pointer = -1 |
| 46 | nprefix = len(prefix) |
| 47 | while 1: |
| 48 | if reverse: |
| 49 | pointer = pointer - 1 |
| 50 | else: |
| 51 | pointer = pointer + 1 |
| 52 | if pointer < 0 or pointer >= nhist: |
| 53 | self.text.bell() |
| 54 | if self._get_source("iomark", "end-1c") != prefix: |
| 55 | self.text.delete("iomark", "end-1c") |
| 56 | self._put_source("iomark", prefix) |
| 57 | pointer = prefix = None |
| 58 | break |
| 59 | item = self.history[pointer] |
| 60 | if item[:nprefix] == prefix and len(item) > nprefix: |
| 61 | self.text.delete("iomark", "end-1c") |
| 62 | self._put_source("iomark", item) |
| 63 | break |
| 64 | self.text.mark_set("insert", "end-1c") |
| 65 | self.text.see("insert") |
| 66 | self.text.tag_remove("sel", "1.0", "end") |
| 67 | self.history_pointer = pointer |
| 68 | self.history_prefix = prefix |
| 69 | |
| 70 | def history_store(self, source): |
| 71 | source = string.strip(source) |
| 72 | if len(source) > 2: |
| 73 | # avoid duplicates |
| 74 | try: |
| 75 | self.history.remove(source) |
| 76 | except ValueError: |
| 77 | pass |
| 78 | self.history.append(source) |
| 79 | self.history_pointer = None |
| 80 | self.history_prefix = None |
| 81 | |
| 82 | def recall(self, s): |
| 83 | s = string.strip(s) |
| 84 | self.text.tag_remove("sel", "1.0", "end") |
| 85 | self.text.delete("iomark", "end-1c") |
| 86 | self.text.mark_set("insert", "end-1c") |
| 87 | self.text.insert("insert", s) |
| 88 | self.text.see("insert") |