| 205 | |
| 206 | |
| 207 | class InsertCommand(Command): |
| 208 | # Undoable insert command |
| 209 | |
| 210 | def __init__(self, index1, chars, tags=None): |
| 211 | Command.__init__(self, index1, None, chars, tags) |
| 212 | |
| 213 | def do(self, text): |
| 214 | self.marks_before = self.save_marks(text) |
| 215 | self.index1 = text.index(self.index1) |
| 216 | if text.compare(self.index1, ">", "end-1c"): |
| 217 | # Insert before the final newline |
| 218 | self.index1 = text.index("end-1c") |
| 219 | text.insert(self.index1, self.chars, self.tags) |
| 220 | self.index2 = text.index("%s+%dc" % (self.index1, len(self.chars))) |
| 221 | self.marks_after = self.save_marks(text) |
| 222 | ##sys.__stderr__.write("do: %s\n" % self) |
| 223 | |
| 224 | def redo(self, text): |
| 225 | text.mark_set('insert', self.index1) |
| 226 | text.insert(self.index1, self.chars, self.tags) |
| 227 | self.set_marks(text, self.marks_after) |
| 228 | text.see('insert') |
| 229 | ##sys.__stderr__.write("redo: %s\n" % self) |
| 230 | |
| 231 | def undo(self, text): |
| 232 | text.mark_set('insert', self.index1) |
| 233 | text.delete(self.index1, self.index2) |
| 234 | self.set_marks(text, self.marks_before) |
| 235 | text.see('insert') |
| 236 | ##sys.__stderr__.write("undo: %s\n" % self) |
| 237 | |
| 238 | def merge(self, cmd): |
| 239 | if self.__class__ is not cmd.__class__: |
| 240 | return False |
| 241 | if self.index2 != cmd.index1: |
| 242 | return False |
| 243 | if self.tags != cmd.tags: |
| 244 | return False |
| 245 | if len(cmd.chars) != 1: |
| 246 | return False |
| 247 | if self.chars and \ |
| 248 | self.classify(self.chars[-1]) != self.classify(cmd.chars): |
| 249 | return False |
| 250 | self.index2 = cmd.index2 |
| 251 | self.chars = self.chars + cmd.chars |
| 252 | return True |
| 253 | |
| 254 | alphanumeric = string.ascii_letters + string.digits + "_" |
| 255 | |
| 256 | def classify(self, c): |
| 257 | if c in self.alphanumeric: |
| 258 | return "alphanumeric" |
| 259 | if c == "\n": |
| 260 | return "newline" |
| 261 | return "punctuation" |
| 262 | |
| 263 | |
| 264 | class DeleteCommand(Command): |
no outgoing calls
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