Mercurial > cpython-lru_cache-weakref
annotate Demo/stdwin/python.py @ 1531:17e5c94f862f legacy-trunk
Remove unused import of builtin
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Wed, 26 Jan 1994 16:03:50 +0000 |
| parents | ada56b0765c1 |
| children | 8df574a655ad |
| rev | line source |
|---|---|
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1 #! /usr/local/bin/python |
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2 |
| 752 | 3 # A STDWIN-based front end for the Python interpreter. |
| 4 # | |
| 5 # This is useful if you want to avoid console I/O and instead | |
| 6 # use text windows to issue commands to the interpreter. | |
| 7 # | |
| 8 # It supports multiple interpreter windows, each with its own context. | |
| 9 # | |
| 10 # BUGS AND CAVEATS: | |
| 11 # | |
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12 # This was written long ago as a demonstration, and slightly hacked to |
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13 # keep it up-to-date, but never as an industry-strength alternative |
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14 # interface to Python. It should be rewritten using more classes, and |
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15 # merged with something like wdb. |
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16 # |
| 752 | 17 # Although this supports multiple windows, the whole application |
| 18 # is deaf and dumb when a command is running in one window. | |
| 19 # | |
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20 # Interrupt is (ab)used to signal EOF on input requests. |
| 752 | 21 # |
| 22 # On UNIX (using X11), interrupts typed in the window will not be | |
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23 # seen until the next input or output operation. When you are stuck |
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24 # in an infinite loop, try typing ^C in the shell window where you |
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25 # started this interpreter. (On the Mac, interrupts work normally.) |
| 752 | 26 |
| 27 | |
| 28 import sys | |
| 29 import stdwin | |
| 30 from stdwinevents import * | |
| 31 import rand | |
| 32 import mainloop | |
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33 import os |
| 752 | 34 |
| 35 | |
| 36 # Stack of windows waiting for [raw_]input(). | |
| 37 # Element [0] is the top. | |
| 38 # If there are multiple windows waiting for input, only the | |
| 39 # one on top of the stack can accept input, because the way | |
| 40 # raw_input() is implemented (using recursive mainloop() calls). | |
| 41 # | |
| 42 inputwindows = [] | |
| 43 | |
| 44 | |
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45 # Exception raised when input is available |
| 752 | 46 # |
| 47 InputAvailable = 'input available for raw_input (not an error)' | |
| 48 | |
| 49 | |
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50 # Main program -- create the window and call the mainloop |
| 752 | 51 # |
| 52 def main(): | |
| 53 # Hack so 'import python' won't load another copy | |
| 54 # of this if we were loaded though 'python python.py'. | |
| 55 # (Should really look at sys.argv[0]...) | |
| 56 if 'inputwindows' in dir(sys.modules['__main__']) and \ | |
| 57 sys.modules['__main__'].inputwindows is inputwindows: | |
| 58 sys.modules['python'] = sys.modules['__main__'] | |
| 59 # | |
| 60 win = makewindow() | |
| 61 mainloop.mainloop() | |
| 62 | |
| 63 | |
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64 # Create a new window |
| 752 | 65 # |
| 66 def makewindow(): | |
| 67 # stdwin.setdefscrollbars(0, 1) # Not in Python 0.9.1 | |
| 68 # stdwin.setfont('monaco') # Not on UNIX! and not Python 0.9.1 | |
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69 # width, height = stdwin.textwidth('in')*40, stdwin.lineheight()*24 |
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70 # stdwin.setdefwinsize(width, height) |
| 752 | 71 win = stdwin.open('Python interpreter ready') |
| 72 win.editor = win.textcreate((0,0), win.getwinsize()) | |
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73 win.globals = {} # Dictionary for user's globals |
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74 win.command = '' # Partially read command |
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75 win.busy = 0 # Ready to accept a command |
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76 win.auto = 1 # [CR] executes command |
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77 win.insertOutput = 1 # Insert output at focus |
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78 win.insertError = 1 # Insert error output at focus |
| 752 | 79 win.setwincursor('ibeam') |
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80 win.filename = '' # Empty if no file for this window |
| 752 | 81 makefilemenu(win) |
| 82 makeeditmenu(win) | |
| 83 win.dispatch = pdispatch # Event dispatch function | |
| 84 mainloop.register(win) | |
| 85 return win | |
| 86 | |
| 87 | |
| 88 # Make a 'File' menu | |
| 89 # | |
| 90 def makefilemenu(win): | |
| 91 win.filemenu = mp = win.menucreate('File') | |
| 92 mp.callback = [] | |
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93 additem(mp, 'New', 'N', do_new) |
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94 additem(mp, 'Open...', 'O', do_open) |
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95 additem(mp, '', '', None) |
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96 additem(mp, 'Close', 'W', do_close) |
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97 additem(mp, 'Save', 'S', do_save) |
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98 additem(mp, 'Save as...', '', do_saveas) |
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99 additem(mp, '', '', None) |
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100 additem(mp, 'Quit', 'Q', do_quit) |
| 752 | 101 |
| 102 | |
| 103 # Make an 'Edit' menu | |
| 104 # | |
| 105 def makeeditmenu(win): | |
| 106 win.editmenu = mp = win.menucreate('Edit') | |
| 107 mp.callback = [] | |
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108 additem(mp, 'Cut', 'X', do_cut) |
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109 additem(mp, 'Copy', 'C', do_copy) |
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110 additem(mp, 'Paste', 'V', do_paste) |
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111 additem(mp, 'Clear', '', do_clear) |
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112 additem(mp, '', '', None) |
| 752 | 113 win.iauto = len(mp.callback) |
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114 additem(mp, 'Autoexecute', '', do_auto) |
| 752 | 115 mp.check(win.iauto, win.auto) |
| 116 win.insertOutputNum = len(mp.callback) | |
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117 additem(mp, 'Insert Output', '', do_insertOutputOption) |
| 752 | 118 win.insertErrorNum = len(mp.callback) |
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119 additem(mp, 'Insert Error', '', do_insertErrorOption) |
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120 additem(mp, 'Exec', '\r', do_exec) |
| 752 | 121 |
| 122 | |
| 123 # Helper to add a menu item and callback function | |
| 124 # | |
| 125 def additem(mp, text, shortcut, handler): | |
| 126 if shortcut: | |
| 127 mp.additem(text, shortcut) | |
| 128 else: | |
| 129 mp.additem(text) | |
| 130 mp.callback.append(handler) | |
| 131 | |
| 132 | |
| 133 # Dispatch a single event to the interpreter. | |
| 134 # Resize events cause a resize of the editor. | |
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135 # Some events are treated specially. |
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136 # Most other events are passed directly to the editor. |
| 752 | 137 # |
| 138 def pdispatch(event): | |
| 139 type, win, detail = event | |
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140 if not win: |
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141 win = stdwin.getactive() |
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142 if not win: return |
| 752 | 143 if type == WE_CLOSE: |
| 144 do_close(win) | |
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145 return |
| 752 | 146 elif type == WE_SIZE: |
| 147 win.editor.move((0, 0), win.getwinsize()) | |
| 148 elif type == WE_COMMAND and detail == WC_RETURN: | |
| 149 if win.auto: | |
| 150 do_exec(win) | |
| 151 else: | |
| 152 void = win.editor.event(event) | |
| 153 elif type == WE_COMMAND and detail == WC_CANCEL: | |
| 154 if win.busy: | |
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155 raise KeyboardInterrupt |
| 752 | 156 else: |
| 157 win.command = '' | |
| 158 settitle(win) | |
| 159 elif type == WE_MENU: | |
| 160 mp, item = detail | |
| 161 mp.callback[item](win) | |
| 162 else: | |
| 163 void = win.editor.event(event) | |
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164 if win in mainloop.windows: |
| 752 | 165 # May have been deleted by close... |
| 166 win.setdocsize(0, win.editor.getrect()[1][1]) | |
| 167 if type in (WE_CHAR, WE_COMMAND): | |
| 168 win.editor.setfocus(win.editor.getfocus()) | |
| 169 | |
| 170 | |
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171 # Helper to set the title of the window |
| 752 | 172 # |
| 173 def settitle(win): | |
| 174 if win.filename == '': | |
| 175 win.settitle('Python interpreter ready') | |
| 176 else: | |
| 177 win.settitle(win.filename) | |
| 178 | |
| 179 | |
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180 # Helper to replace the text of the focus |
| 752 | 181 # |
| 182 def replace(win, text): | |
| 183 win.editor.replace(text) | |
| 184 # Resize the window to display the text | |
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185 win.setdocsize(0, win.editor.getrect()[1][1]) # update the size before |
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186 win.editor.setfocus(win.editor.getfocus()) # move focus to the change |
| 752 | 187 |
| 188 | |
| 189 # File menu handlers | |
| 190 # | |
| 191 def do_new(win): | |
| 192 win = makewindow() | |
| 193 # | |
| 194 def do_open(win): | |
| 195 try: | |
| 196 filename = stdwin.askfile('Open file', '', 0) | |
| 197 win = makewindow() | |
| 198 win.filename = filename | |
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199 win.editor.replace(open(filename, 'r').read()) |
| 752 | 200 win.editor.setfocus(0, 0) |
| 201 win.settitle(win.filename) | |
| 202 # | |
| 203 except KeyboardInterrupt: | |
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204 pass # Don't give an error on cancel |
| 752 | 205 # |
| 206 def do_save(win): | |
| 207 try: | |
| 208 if win.filename == '': | |
| 209 win.filename = stdwin.askfile('Open file', '', 1) | |
| 210 f = open(win.filename, 'w') | |
| 211 f.write(win.editor.gettext()) | |
| 212 # | |
| 213 except KeyboardInterrupt: | |
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214 pass # Don't give an error on cancel |
| 752 | 215 |
| 216 def do_saveas(win): | |
| 217 currentFilename = win.filename | |
| 218 win.filename = '' | |
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219 do_save(win) # Use do_save with empty filename |
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220 if win.filename == '': # Restore the name if do_save did not set it |
| 752 | 221 win.filename = currentFilename |
| 222 # | |
| 223 def do_close(win): | |
| 224 if win.busy: | |
| 225 stdwin.message('Can\'t close busy window') | |
| 226 return # need to fail if quitting?? | |
| 227 win.editor = None # Break circular reference | |
| 228 #del win.editmenu # What about the filemenu?? | |
| 229 mainloop.unregister(win) | |
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230 win.close() |
| 752 | 231 # |
| 232 def do_quit(win): | |
| 233 # Call win.dispatch instead of do_close because there | |
| 234 # may be 'alien' windows in the list. | |
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235 for win in mainloop.windows[:]: |
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236 mainloop.dispatch((WE_CLOSE, win, None)) |
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237 # need to catch failed close |
| 752 | 238 |
| 239 | |
| 240 # Edit menu handlers | |
| 241 # | |
| 242 def do_cut(win): | |
| 243 text = win.editor.getfocustext() | |
| 244 if not text: | |
| 245 stdwin.fleep() | |
| 246 return | |
| 247 stdwin.setcutbuffer(0, text) | |
| 248 replace(win, '') | |
| 249 # | |
| 250 def do_copy(win): | |
| 251 text = win.editor.getfocustext() | |
| 252 if not text: | |
| 253 stdwin.fleep() | |
| 254 return | |
| 255 stdwin.setcutbuffer(0, text) | |
| 256 # | |
| 257 def do_paste(win): | |
| 258 text = stdwin.getcutbuffer(0) | |
| 259 if not text: | |
| 260 stdwin.fleep() | |
| 261 return | |
| 262 replace(win, text) | |
| 263 # | |
| 264 def do_clear(win): | |
| 265 replace(win, '') | |
| 266 | |
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267 |
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268 # These would be better in a preferences dialog: |
| 752 | 269 # |
| 270 def do_auto(win): | |
| 271 win.auto = (not win.auto) | |
| 272 win.editmenu.check(win.iauto, win.auto) | |
| 273 # | |
| 274 def do_insertOutputOption(win): | |
| 275 win.insertOutput = (not win.insertOutput) | |
| 276 title = ['Append Output', 'Insert Output'][win.insertOutput] | |
| 277 win.editmenu.setitem(win.insertOutputNum, title) | |
| 278 # | |
| 279 def do_insertErrorOption(win): | |
| 280 win.insertError = (not win.insertError) | |
| 281 title = ['Error Dialog', 'Insert Error'][win.insertError] | |
| 282 win.editmenu.setitem(win.insertErrorNum, title) | |
| 283 | |
| 284 | |
| 285 # Extract a command from the editor and execute it, or pass input to | |
| 286 # an interpreter waiting for it. | |
| 287 # Incomplete commands are merely placed in the window's command buffer. | |
| 288 # All exceptions occurring during the execution are caught and reported. | |
| 289 # (Tracebacks are currently not possible, as the interpreter does not | |
| 290 # save the traceback pointer until it reaches its outermost level.) | |
| 291 # | |
| 292 def do_exec(win): | |
| 293 if win.busy: | |
| 294 if win not in inputwindows: | |
| 295 stdwin.message('Can\'t run recursive commands') | |
| 296 return | |
| 297 if win <> inputwindows[0]: | |
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298 stdwin.message('Please complete recursive input first') |
| 752 | 299 return |
| 300 # | |
| 301 # Set text to the string to execute. | |
| 302 a, b = win.editor.getfocus() | |
| 303 alltext = win.editor.gettext() | |
| 304 n = len(alltext) | |
| 305 if a == b: | |
| 306 # There is no selected text, just an insert point; | |
| 307 # so execute the current line. | |
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308 while 0 < a and alltext[a-1] <> '\n': # Find beginning of line |
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309 a = a-1 |
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310 while b < n and alltext[b] <> '\n': # Find end of line after b |
| 752 | 311 b = b+1 |
| 312 text = alltext[a:b] + '\n' | |
| 313 else: | |
| 314 # Execute exactly the selected text. | |
| 315 text = win.editor.getfocustext() | |
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316 if text[-1:] <> '\n': # Make sure text ends with \n |
| 752 | 317 text = text + '\n' |
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318 while b < n and alltext[b] <> '\n': # Find end of line after b |
| 752 | 319 b = b+1 |
| 320 # | |
| 321 # Set the focus to expect the output, since there is always something. | |
| 322 # Output will be inserted at end of line after current focus, | |
| 323 # or appended to the end of the text. | |
| 324 b = [n, b][win.insertOutput] | |
| 325 win.editor.setfocus(b, b) | |
| 326 # | |
| 327 # Make sure there is a preceeding newline. | |
| 328 if alltext[b-1:b] <> '\n': | |
| 329 win.editor.replace('\n') | |
| 330 # | |
| 331 # | |
| 332 if win.busy: | |
| 333 # Send it to raw_input() below | |
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334 raise InputAvailable, text |
| 752 | 335 # |
| 336 # Like the real Python interpreter, we want to execute | |
| 337 # single-line commands immediately, but save multi-line | |
| 338 # commands until they are terminated by a blank line. | |
| 339 # Unlike the real Python interpreter, we don't do any syntax | |
| 340 # checking while saving up parts of a multi-line command. | |
| 341 # | |
| 342 # The current heuristic to determine whether a command is | |
| 343 # the first line of a multi-line command simply checks whether | |
| 344 # the command ends in a colon (followed by a newline). | |
| 345 # This is not very robust (comments and continuations will | |
| 346 # confuse it), but it is usable, and simple to implement. | |
| 347 # (It even has the advantage that single-line loops etc. | |
| 348 # don't need te be terminated by a blank line.) | |
| 349 # | |
| 350 if win.command: | |
| 351 # Already continuing | |
| 352 win.command = win.command + text | |
| 353 if win.command[-2:] <> '\n\n': | |
| 354 win.settitle('Unfinished command...') | |
| 355 return # Need more... | |
| 356 else: | |
| 357 # New command | |
| 358 win.command = text | |
| 359 if text[-2:] == ':\n': | |
| 360 win.settitle('Unfinished command...') | |
| 361 return | |
| 362 command = win.command | |
| 363 win.command = '' | |
| 364 win.settitle('Executing command...') | |
| 365 # | |
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366 # Some hacks: |
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367 # - The standard files are replaced by an IOWindow instance. |
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368 # - A 2nd argument to exec() is used to specify the directory |
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369 # holding the user's global variables. (If this wasn't done, |
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370 # the exec would be executed in the current local environment, |
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371 # and the user's assignments to globals would be lost...) |
| 752 | 372 # |
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373 save_stdin = sys.stdin |
| 752 | 374 save_stdout = sys.stdout |
| 375 save_stderr = sys.stderr | |
| 376 try: | |
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377 sys.stdin = sys.stdout = sys.stderr = IOWindow(win) |
| 752 | 378 win.busy = 1 |
| 379 try: | |
| 380 exec(command, win.globals) | |
| 381 except KeyboardInterrupt: | |
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382 print '[Interrupt]' |
| 752 | 383 except: |
| 384 msg = sys.exc_type | |
| 385 if sys.exc_value <> None: | |
| 386 msg = msg + ': ' + `sys.exc_value` | |
| 387 if win.insertError: | |
| 388 stdwin.fleep() | |
| 389 replace(win, msg + '\n') | |
| 390 else: | |
| 391 win.settitle('Unhandled exception') | |
| 392 stdwin.message(msg) | |
| 393 finally: | |
| 394 # Restore redirected I/O in *all* cases | |
| 395 win.busy = 0 | |
| 396 sys.stderr = save_stderr | |
| 397 sys.stdout = save_stdout | |
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398 sys.stdin = save_stdin |
| 752 | 399 settitle(win) |
| 400 | |
| 401 | |
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402 # Class emulating file I/O from/to a window |
| 752 | 403 # |
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404 class IOWindow: |
| 752 | 405 # |
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406 def __init__(self, win): |
| 752 | 407 self.win = win |
| 408 # | |
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409 def readline(self, *unused_args): |
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410 n = len(inputwindows) |
| 752 | 411 save_title = self.win.gettitle() |
| 412 title = n*'(' + 'Requesting input...' + ')'*n | |
| 413 self.win.settitle(title) | |
| 414 inputwindows.insert(0, self.win) | |
| 415 try: | |
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416 try: |
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417 mainloop.mainloop() |
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418 finally: |
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419 del inputwindows[0] |
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420 self.win.settitle(save_title) |
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421 except InputAvailable, val: # See do_exec above |
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422 return val |
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423 except KeyboardInterrupt: |
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424 raise EOFError # Until we have a "send EOF" key |
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425 # If we didn't catch InputAvailable, something's wrong... |
| 752 | 426 raise EOFError |
| 427 # | |
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428 def write(self, text): |
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429 mainloop.check() |
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430 replace(self.win, text) |
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431 mainloop.check() |
| 752 | 432 |
| 433 | |
| 434 # Currently unused function to test a command's syntax without executing it | |
| 435 # | |
| 436 def testsyntax(s): | |
| 437 import string | |
| 438 lines = string.splitfields(s, '\n') | |
| 439 for i in range(len(lines)): lines[i] = '\t' + lines[i] | |
| 440 lines.insert(0, 'if 0:') | |
| 441 lines.append('') | |
| 442 exec(string.joinfields(lines, '\n')) | |
| 443 | |
| 444 | |
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445 # Call the main program |
| 752 | 446 # |
| 447 main() |