Mercurial > jwe > qt-gui-with-push-parser
annotate gui-main.cpp @ 3:52c033864347
add build instructions to NOTES file
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 22 May 2019 16:21:06 -0400 |
| parents | 08df60a01bc1 |
| children | 0e154787183d |
| rev | line source |
|---|---|
| 0 | 1 #include <iostream> |
| 2 #include <sstream> | |
| 3 #include <string> | |
| 4 | |
| 5 #include <cstdlib> | |
| 6 #include <cstring> | |
| 7 | |
| 8 #include <QApplication> | |
| 9 #include <QKeyEvent> | |
| 10 #include <QTextDocument> | |
| 11 #include <QTextEdit> | |
| 12 | |
| 13 #include "gui-main.h" | |
|
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14 #include "main.h" |
| 0 | 15 |
| 16 #include "gui-main.h" | |
| 17 #include "parse.h" | |
| 18 | |
| 19 #include <readline/readline.h> | |
| 20 #include <readline/history.h> | |
| 21 | |
| 22 namespace gui | |
| 23 { | |
| 24 static int available_char = 0; | |
| 25 | |
| 26 static inline int ctrl (int c) | |
| 27 { | |
| 28 return c & 0x1f; | |
| 29 } | |
| 30 | |
| 31 static command_window *calc_interaction_window = 0; | |
| 32 | |
| 33 static int getc (FILE *) | |
| 34 { | |
| 35 int tmp = available_char; | |
| 36 available_char = 0; | |
| 37 return tmp; | |
| 38 } | |
| 39 | |
| 40 static void redisplay (void) | |
| 41 { | |
| 42 if (calc_interaction_window) | |
| 43 calc_interaction_window->redisplay (); | |
| 44 } | |
| 45 | |
| 46 static void prep_term (int) | |
| 47 { | |
| 48 } | |
| 49 | |
| 50 static void deprep_term (void) | |
| 51 { | |
| 52 } | |
| 53 | |
| 54 static void accept_line (char *line) | |
| 55 { | |
| 56 if (calc_interaction_window) | |
| 57 calc_interaction_window->accept (line ? line : ""); | |
| 58 } | |
| 59 | |
| 60 static void display_completion_matches (char **matches, int num_matches, | |
| 61 int /* max_length */) | |
| 62 { | |
| 63 if (calc_interaction_window) | |
| 64 { | |
| 65 std::ostringstream buf; | |
| 66 | |
| 67 if (num_matches > 1) | |
| 68 buf << "\n"; | |
| 69 | |
| 70 for (int i = 1; i < num_matches; i++) | |
| 71 buf << matches[i] << "\n"; | |
| 72 | |
| 73 calc_interaction_window->insert_at_end (buf.str ()); | |
| 74 | |
| 75 calc_interaction_window->redisplay (); | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 static void readline_init (void) | |
| 80 { | |
| 81 rl_initialize (); | |
| 82 | |
| 83 rl_getc_function = getc; | |
| 84 rl_redisplay_function = redisplay; | |
| 85 rl_prep_term_function = prep_term; | |
| 86 rl_deprep_term_function = deprep_term; | |
| 87 rl_completion_display_matches_hook = display_completion_matches; | |
| 88 | |
| 89 rl_callback_handler_install (">> ", accept_line); | |
| 90 } | |
| 91 | |
| 92 static void readline_fini (void) | |
| 93 { | |
| 94 rl_callback_handler_remove (); | |
| 95 } | |
| 96 | |
| 97 command_window::command_window (QWidget *p) | |
| 98 : QTextEdit (p), | |
| 99 m_buffer (new QTextDocument ()), | |
| 100 beg_mark (), prompt_mark () | |
| 101 { | |
| 102 setWindowTitle ("Qt::TextEdit example"); | |
| 103 | |
| 104 setMinimumSize (QSize (600, 400)); | |
| 105 | |
| 106 setDocument (m_buffer); | |
| 107 | |
| 108 connect (this, SIGNAL (result_available (double)), | |
| 109 this, SLOT (handle_result (double))); | |
| 110 | |
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111 connect (this, SIGNAL (input_char_available (int)), |
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112 this, SLOT (handle_input_char (int))); |
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113 |
| 0 | 114 insert_at_end |
| 115 ("Qt Example Calculator.\n" | |
| 116 "Available operations: + - * / ^ ()\n" | |
| 117 "Semicolon terminates statement.\n" | |
| 118 "Up Arrow key moves to previous line in the command history.\n" | |
| 119 "Down Arrow key moves to next line in the comand history.\n\n"); | |
| 120 | |
| 121 beg_mark = set_mark (); | |
| 122 } | |
| 123 | |
| 124 // Accept an input line, parse and possibly execute it. | |
| 125 | |
| 126 void command_window::accept (const std::string& line) | |
| 127 { | |
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128 if (calc::debug_mode) |
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129 std::cerr << "accept: " << line << std::endl; |
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130 |
| 0 | 131 insert_at_end ("\n"); |
| 132 | |
| 133 if (! line.empty ()) | |
| 134 { | |
| 135 add_history (line.c_str ()); | |
| 136 using_history (); | |
| 137 | |
| 138 // FIXME: what is the right thing to do with status returned | |
| 139 // by parser. | |
| 140 interpreter::parse_and_execute (line); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // Redisplay current command line. | |
| 145 | |
| 146 void command_window::redisplay (void) | |
| 147 { | |
| 148 erase_line (); | |
| 149 | |
| 150 std::string line = rl_line_buffer ? rl_line_buffer : ""; | |
| 151 std::string prompt = (rl_prompt && interpreter::beg_of_stmt) ? rl_prompt : ""; | |
| 152 | |
| 153 insert_line (prompt, line); | |
| 154 | |
| 155 scroll_to_bottom (); | |
| 156 | |
| 157 QTextCursor cursor = textCursor (); | |
| 158 | |
| 159 cursor.setPosition (prompt_mark + rl_point, QTextCursor::MoveAnchor); | |
| 160 | |
| 161 setTextCursor (cursor); | |
| 162 } | |
| 163 | |
| 164 void command_window::insert_at_end (const std::string& text) | |
| 165 { | |
| 166 scroll_to_bottom (); | |
| 167 | |
| 168 insert_at_cursor (text); | |
| 169 } | |
| 170 | |
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171 void command_window::emit_error (const std::string& msg) |
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172 { |
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173 insert_at_end ("parse error: " + msg); |
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174 |
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175 rl_abort (0, 0); |
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176 } |
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177 |
| 0 | 178 void command_window::emit_result (double value) |
| 179 { | |
| 180 emit result_available (value); | |
| 181 } | |
| 182 | |
| 183 // FIXME: do we really need this extra function? | |
| 184 void command_window::handle_result (double value) | |
| 185 { | |
| 186 insert_result (value); | |
| 187 } | |
| 188 | |
| 189 void command_window::keyPressEvent (QKeyEvent *event) | |
| 190 { | |
| 191 if (! event) | |
| 192 return; | |
| 193 | |
| 194 if (event->type () == QEvent::KeyPress) | |
| 195 { | |
| 196 int key = event->key (); | |
| 197 | |
| 198 switch (key) | |
| 199 { | |
| 200 case Qt::Key_Return: | |
| 201 key = 0x0A; | |
| 202 break; | |
| 203 | |
| 204 case Qt::Key_Backspace: | |
| 205 key = 0x08; | |
| 206 break; | |
| 207 | |
| 208 case Qt::Key_Tab: | |
| 209 key = 0x09; | |
| 210 break; | |
| 211 | |
| 212 case Qt::Key_Escape: | |
| 213 key = 0x1b; | |
| 214 break; | |
| 215 | |
| 216 case Qt::Key_Up: | |
| 217 case Qt::Key_Down: | |
| 218 case Qt::Key_Right: | |
| 219 case Qt::Key_Left: | |
| 220 key = do_arrow_key (key); | |
| 221 break; | |
| 222 | |
| 223 default: | |
| 224 { | |
| 225 switch (event->modifiers ()) | |
| 226 { | |
| 227 case Qt::ControlModifier: | |
| 228 if (key > 0x3f && key < 0x7b) | |
| 229 key &= 0x1f; | |
| 230 else | |
| 231 key = -1; | |
| 232 break; | |
| 233 | |
| 234 default: | |
| 235 { | |
| 236 // Don't shoot me, this is just a demo... | |
| 237 QString text = event->text (); | |
| 238 QByteArray latin_text = text.toLatin1 (); | |
| 239 key = latin_text[0]; | |
| 240 } | |
| 241 break; | |
| 242 } | |
| 243 } | |
| 244 break; | |
| 245 } | |
| 246 | |
| 247 if (key >= 0) | |
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248 emit input_char_available (key); |
| 0 | 249 } |
| 250 } | |
| 251 | |
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252 |
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253 void command_window::handle_input_char (int key) |
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254 { |
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255 available_char = key; |
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256 rl_callback_read_char (); |
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257 } |
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258 |
| 0 | 259 int command_window::do_arrow_key (int arrow_key) |
| 260 { | |
| 261 int retval = 0; | |
| 262 | |
| 263 available_char = 0x1b; | |
| 264 rl_callback_read_char (); | |
| 265 | |
| 266 available_char = '['; | |
| 267 rl_callback_read_char (); | |
| 268 | |
| 269 switch (arrow_key) | |
| 270 { | |
| 271 case Qt::Key_Up: | |
| 272 retval = 'A'; | |
| 273 break; | |
| 274 | |
| 275 case Qt::Key_Down: | |
| 276 retval = 'B'; | |
| 277 break; | |
| 278 | |
| 279 case Qt::Key_Right: | |
| 280 retval = 'C'; | |
| 281 break; | |
| 282 | |
| 283 case Qt::Key_Left: | |
| 284 retval = 'D'; | |
| 285 break; | |
| 286 } | |
| 287 | |
| 288 return retval; | |
| 289 } | |
| 290 | |
| 291 // Retrieve a command from the history list and insert it on the | |
| 292 // current command. | |
| 293 | |
| 294 void command_window::history (bool up) | |
| 295 { | |
| 296 HIST_ENTRY *entry = up ? previous_history () : next_history (); | |
| 297 | |
| 298 if (entry) | |
| 299 { | |
| 300 erase_line (); | |
| 301 | |
| 302 std::string prompt = rl_prompt ? rl_prompt : ""; | |
| 303 | |
| 304 insert_line (prompt, entry->line); | |
| 305 } | |
| 306 else if (! up) | |
| 307 erase_line (); | |
| 308 | |
| 309 scroll_to_bottom (); | |
| 310 } | |
| 311 | |
| 312 void command_window::erase_line (void) | |
| 313 { | |
| 314 QTextCursor cursor = textCursor (); | |
| 315 | |
| 316 cursor.movePosition (QTextCursor::End); | |
| 317 cursor.select (QTextCursor::LineUnderCursor); | |
| 318 cursor.removeSelectedText (); | |
| 319 | |
| 320 setTextCursor (cursor); | |
| 321 } | |
| 322 | |
| 323 void command_window::insert_at_cursor (const std::string& text) | |
| 324 { | |
| 325 QTextCursor cursor = textCursor (); | |
| 326 | |
| 327 cursor.insertText (QString::fromStdString (text)); | |
| 328 | |
| 329 setTextCursor (cursor); | |
| 330 } | |
| 331 | |
| 332 void command_window::insert_line (const std::string& prompt, | |
| 333 const std::string& line) | |
| 334 { | |
| 335 beg_mark = set_mark (); | |
| 336 | |
| 337 insert_at_cursor (prompt); | |
| 338 | |
| 339 prompt_mark = set_mark (); | |
| 340 | |
| 341 insert_at_cursor (line); | |
| 342 } | |
| 343 | |
| 344 int command_window::set_mark (void) | |
| 345 { | |
| 346 return textCursor ().position (); | |
| 347 } | |
| 348 | |
| 349 void command_window::insert_result (double value) | |
| 350 { | |
| 351 std::ostringstream buf; | |
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352 |
| 0 | 353 buf << "ans = " << value << "\n"; |
| 354 | |
| 355 insert_at_cursor (buf.str ()); | |
| 356 | |
| 357 beg_mark = set_mark (); | |
| 358 | |
| 359 scroll_to_bottom (); | |
| 360 } | |
| 361 | |
| 362 void command_window::scroll_to_bottom (void) | |
| 363 { | |
| 364 QTextCursor cursor = textCursor (); | |
| 365 | |
| 366 cursor.movePosition (QTextCursor::End); | |
| 367 | |
| 368 setTextCursor (cursor); | |
| 369 } | |
| 370 | |
| 371 int main (int argc, char *argv[]) | |
| 372 { | |
| 373 interpreter::parser_init (); | |
| 374 | |
| 375 QApplication app (argc, argv); | |
| 376 | |
| 377 calc_interaction_window = new command_window (); | |
| 378 | |
| 379 calc_interaction_window->show (); | |
| 380 | |
| 381 readline_init (); | |
| 382 | |
| 383 int status = app.exec (); | |
| 384 | |
| 385 readline_fini (); | |
| 386 | |
| 387 interpreter::parser_fini (); | |
| 388 | |
| 389 return status; | |
| 390 } | |
| 391 | |
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392 void emit_error (const std::string& msg) |
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393 { |
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394 calc_interaction_window->emit_error (msg); |
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395 } |
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396 |
| 0 | 397 void emit_result (double value) |
| 398 { | |
| 399 calc_interaction_window->emit_result (value); | |
| 400 } | |
| 401 } | |
| 402 | |
| 403 // -- Variable: rl_getc_func_t * rl_getc_function | |
| 404 // If non-zero, Readline will call indirectly through this pointer to | |
| 405 // get a character from the input stream. By default, it is set to | |
| 406 // `rl_getc', the default Readline character input function (*note | |
| 407 // Character Input::). | |
| 408 | |
| 409 // -- Variable: rl_voidfunc_t * rl_redisplay_function | |
| 410 // If non-zero, Readline will call indirectly through this pointer to | |
| 411 // update the display with the current contents of the editing buffer. | |
| 412 // By default, it is set to `rl_redisplay', the default Readline | |
| 413 // redisplay function (*note Redisplay::). | |
| 414 | |
| 415 // -- Variable: rl_vintfunc_t * rl_prep_term_function | |
| 416 // If non-zero, Readline will call indirectly through this pointer to | |
| 417 // initialize the terminal. The function takes a single argument, an | |
| 418 // `int' flag that says whether or not to use eight-bit characters. | |
| 419 // By default, this is set to `rl_prep_terminal' (*note Terminal | |
| 420 // Management::). | |
| 421 | |
| 422 // -- Variable: rl_voidfunc_t * rl_deprep_term_function | |
| 423 // If non-zero, Readline will call indirectly through this pointer to | |
| 424 // reset the terminal. This function should undo the effects of | |
| 425 // `rl_prep_term_function'. By default, this is set to | |
| 426 // `rl_deprep_terminal' (*note Terminal Management::). | |
| 427 | |
| 428 // -- Function: void rl_callback_handler_install (const char *prompt, | |
| 429 // rl_vcpfunc_t *lhandler) | |
| 430 // Set up the terminal for readline I/O and display the initial | |
| 431 // expanded value of PROMPT. Save the value of LHANDLER to use as a | |
| 432 // function to call when a complete line of input has been entered. | |
| 433 // The function takes the text of the line as an argument. | |
| 434 | |
| 435 // -- Function: void rl_callback_read_char (void) | |
| 436 // Whenever an application determines that keyboard input is | |
| 437 // available, it should call `rl_callback_read_char()', which will | |
| 438 // read the next character from the current input source. If that | |
| 439 // character completes the line, `rl_callback_read_char' will invoke | |
| 440 // the LHANDLER function saved by `rl_callback_handler_install' to | |
| 441 // process the line. Before calling the LHANDLER function, the | |
| 442 // terminal settings are reset to the values they had before calling | |
| 443 // `rl_callback_handler_install'. If the LHANDLER function returns, | |
| 444 // the terminal settings are modified for Readline's use again. | |
| 445 // `EOF' is indicated by calling LHANDLER with a `NULL' line. | |
| 446 | |
| 447 // -- Function: void rl_callback_handler_remove (void) | |
| 448 // Restore the terminal to its initial state and remove the line | |
| 449 // handler. This may be called from within a callback as well as | |
| 450 // independently. If the LHANDLER installed by | |
| 451 // `rl_callback_handler_install' does not exit the program, either | |
| 452 // this function or the function referred to by the value of | |
| 453 // `rl_deprep_term_function' should be called before the program | |
| 454 // exits to reset the terminal settings. | |
| 455 | |
| 456 // -- Variable: rl_compdisp_func_t * rl_completion_display_matches_hook | |
| 457 // If non-zero, then this is the address of a function to call when | |
| 458 // completing a word would normally display the list of possible | |
| 459 // matches. This function is called in lieu of Readline displaying | |
| 460 // the list. It takes three arguments: (`char **'MATCHES, `int' | |
| 461 // NUM_MATCHES, `int' MAX_LENGTH) where MATCHES is the array of | |
| 462 // matching strings, NUM_MATCHES is the number of strings in that | |
| 463 // array, and MAX_LENGTH is the length of the longest string in that | |
| 464 // array. Readline provides a convenience function, | |
| 465 // `rl_display_match_list', that takes care of doing the display to | |
| 466 // Readline's output stream. That function may be called from this | |
| 467 // hook. |