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| 243 | \\$1\l'|0\(ul'\\$2 |
| 244 | .. |
| 245 | .TH Tcl_ListObj 3 8.0 Tcl "Tcl Library Procedures" |
| 246 | .BS |
| 247 | .SH NAME |
| 248 | Tcl_ListObjAppendList, Tcl_ListObjAppendElement, Tcl_NewListObj, Tcl_SetListObj, Tcl_ListObjGetElements, Tcl_ListObjLength, Tcl_ListObjIndex, Tcl_ListObjReplace \- manipulate Tcl objects as lists |
| 249 | .SH SYNOPSIS |
| 250 | .nf |
| 251 | \fB#include <tcl.h>\fR |
| 252 | .sp |
| 253 | int |
| 254 | \fBTcl_ListObjAppendList\fR(\fIinterp, listPtr, elemListPtr\fR) |
| 255 | .sp |
| 256 | int |
| 257 | \fBTcl_ListObjAppendElement\fR(\fIinterp, listPtr, objPtr\fR) |
| 258 | .sp |
| 259 | Tcl_Obj * |
| 260 | \fBTcl_NewListObj\fR(\fIobjc, objv\fR) |
| 261 | .sp |
| 262 | \fBTcl_SetListObj\fR(\fIobjPtr, objc, objv\fR) |
| 263 | .sp |
| 264 | int |
| 265 | \fBTcl_ListObjGetElements\fR(\fIinterp, listPtr, objcPtr, objvPtr\fR) |
| 266 | .sp |
| 267 | int |
| 268 | \fBTcl_ListObjLength\fR(\fIinterp, listPtr, intPtr\fR) |
| 269 | .sp |
| 270 | int |
| 271 | \fBTcl_ListObjIndex\fR(\fIinterp, listPtr, index, objPtrPtr\fR) |
| 272 | .sp |
| 273 | int |
| 274 | \fBTcl_ListObjReplace\fR(\fIinterp, listPtr, first, count, objc, objv\fR) |
| 275 | .SH ARGUMENTS |
| 276 | .AS Tcl_Interp "*CONST objv[]" out |
| 277 | .AP Tcl_Interp *interp in |
| 278 | If an error occurs while converting an object to be a list object, |
| 279 | an error message is left in the interpreter's result object |
| 280 | unless \fIinterp\fR is NULL. |
| 281 | .AP Tcl_Obj *listPtr in/out |
| 282 | Points to the list object to be manipulated. |
| 283 | If \fIlistPtr\fR does not already point to a list object, |
| 284 | an attempt will be made to convert it to one. |
| 285 | .AP Tcl_Obj *elemListPtr in/out |
| 286 | For \fBTcl_ListObjAppendList\fR, this points to a list object |
| 287 | containing elements to be appended onto \fIlistPtr\fR. |
| 288 | Each element of *\fIelemListPtr\fR will |
| 289 | become a new element of \fIlistPtr\fR. |
| 290 | If *\fIelemListPtr\fR is not NULL and |
| 291 | does not already point to a list object, |
| 292 | an attempt will be made to convert it to one. |
| 293 | .AP Tcl_Obj *objPtr in |
| 294 | For \fBTcl_ListObjAppendElement\fR, |
| 295 | points to the Tcl object that will be appended to \fIlistPtr\fR. |
| 296 | For \fBTcl_SetListObj\fR, |
| 297 | this points to the Tcl object that will be converted to a list object |
| 298 | containing the \fIobjc\fR elements of the array referenced by \fIobjv\fR. |
| 299 | .AP int *objcPtr in |
| 300 | Points to location where \fBTcl_ListObjGetElements\fR |
| 301 | stores the number of element objects in \fIlistPtr\fR. |
| 302 | .AP Tcl_Obj ***objvPtr out |
| 303 | A location where \fBTcl_ListObjGetElements\fR stores a pointer to an array |
| 304 | of pointers to the element objects of \fIlistPtr\fR. |
| 305 | .AP int objc in |
| 306 | The number of Tcl objects that \fBTcl_NewListObj\fR |
| 307 | will insert into a new list object, |
| 308 | and \fBTcl_ListObjReplace\fR will insert into \fIlistPtr\fR. |
| 309 | For \fBTcl_SetListObj\fR, |
| 310 | the number of Tcl objects to insert into \fIobjPtr\fR. |
| 311 | .VS |
| 312 | .AP Tcl_Obj "*CONST\ objv[]" in |
| 313 | An array of pointers to objects. |
| 314 | \fBTcl_NewListObj\fR will insert these objects into a new list object |
| 315 | and \fBTcl_ListObjReplace\fR will insert them into an existing \fIlistPtr\fR. |
| 316 | Each object will become a separate list element. |
| 317 | .VE |
| 318 | .AP int *intPtr out |
| 319 | Points to location where \fBTcl_ListObjLength\fR |
| 320 | stores the length of the list. |
| 321 | .AP int index in |
| 322 | Index of the list element that \fBTcl_ListObjIndex\fR |
| 323 | is to return. |
| 324 | The first element has index 0. |
| 325 | .AP Tcl_Obj **objPtrPtr out |
| 326 | Points to place where \fBTcl_ListObjIndex\fR is to store |
| 327 | a pointer to the resulting list element object. |
| 328 | .AP int first in |
| 329 | Index of the starting list element that \fBTcl_ListObjReplace\fR |
| 330 | is to replace. |
| 331 | The list's first element has index 0. |
| 332 | .AP int count in |
| 333 | The number of elements that \fBTcl_ListObjReplace\fR |
| 334 | is to replace. |
| 335 | .BE |
| 336 | |
| 337 | .SH DESCRIPTION |
| 338 | .PP |
| 339 | Tcl list objects have an internal representation that supports |
| 340 | the efficient indexing and appending. |
| 341 | The procedures described in this man page are used to |
| 342 | create, modify, index, and append to Tcl list objects from C code. |
| 343 | .PP |
| 344 | \fBTcl_ListObjAppendList\fR and \fBTcl_ListObjAppendElement\fR |
| 345 | both add one or more objects |
| 346 | to the end of the list object referenced by \fIlistPtr\fR. |
| 347 | \fBTcl_ListObjAppendList\fR appends each element of the list object |
| 348 | referenced by \fIelemListPtr\fR while |
| 349 | \fBTcl_ListObjAppendElement\fR appends the single object |
| 350 | referenced by \fIobjPtr\fR. |
| 351 | Both procedures will convert the object referenced by \fIlistPtr\fR |
| 352 | to a list object if necessary. |
| 353 | If an error occurs during conversion, |
| 354 | both procedures return \fBTCL_ERROR\fR and leave an error message |
| 355 | in the interpreter's result object if \fIinterp\fR is not NULL. |
| 356 | Similarly, if \fIelemListPtr\fR does not already refer to a list object, |
| 357 | \fBTcl_ListObjAppendList\fR will attempt to convert it to one |
| 358 | and if an error occurs during conversion, |
| 359 | will return \fBTCL_ERROR\fR |
| 360 | and leave an error message in the interpreter's result object |
| 361 | if interp is not NULL. |
| 362 | Both procedures invalidate any old string representation of \fIlistPtr\fR |
| 363 | and, if it was converted to a list object, |
| 364 | free any old internal representation. |
| 365 | Similarly, \fBTcl_ListObjAppendList\fR frees any old internal representation |
| 366 | of \fIelemListPtr\fR if it converts it to a list object. |
| 367 | After appending each element in \fIelemListPtr\fR, |
| 368 | \fBTcl_ListObjAppendList\fR increments the element's reference count |
| 369 | since \fIlistPtr\fR now also refers to it. |
| 370 | For the same reason, \fBTcl_ListObjAppendElement\fR |
| 371 | increments \fIobjPtr\fR's reference count. |
| 372 | If no error occurs, |
| 373 | the two procedures return \fBTCL_OK\fR after appending the objects. |
| 374 | .PP |
| 375 | \fBTcl_NewListObj\fR and \fBTcl_SetListObj\fR |
| 376 | create a new object or modify an existing object to hold |
| 377 | the \fIobjc\fR elements of the array referenced by \fIobjv\fR |
| 378 | where each element is a pointer to a Tcl object. |
| 379 | If \fIobjc\fR is less than or equal to zero, |
| 380 | they return an empty object. |
| 381 | The new object's string representation is left invalid. |
| 382 | The two procedures increment the reference counts |
| 383 | of the elements in \fIobjc\fR since the list object now refers to them. |
| 384 | The new list object returned by \fBTcl_NewListObj\fR |
| 385 | has reference count zero. |
| 386 | .PP |
| 387 | \fBTcl_ListObjGetElements\fR returns a count and a pointer to an array of |
| 388 | the elements in a list object. It returns the count by storing it in the |
| 389 | address \fIobjcPtr\fR. Similarly, it returns the array pointer by storing |
| 390 | it in the address \fIobjvPtr\fR. |
| 391 | The memory pointed to is managed by Tcl and should not be freed by the |
| 392 | caller. |
| 393 | If \fIlistPtr\fR is not already a list object, \fBTcl_ListObjGetElements\fR |
| 394 | will attempt to convert it to one; if the conversion fails, it returns |
| 395 | \fBTCL_ERROR\fR and leaves an error message in the interpreter's result |
| 396 | object if \fIinterp\fR is not NULL. |
| 397 | Otherwise it returns \fBTCL_OK\fR after storing the count and array pointer. |
| 398 | .PP |
| 399 | \fBTcl_ListObjLength\fR returns the number of elements in the list object |
| 400 | referenced by \fIlistPtr\fR. |
| 401 | It returns this count by storing an integer in the address \fIintPtr\fR. |
| 402 | If the object is not already a list object, |
| 403 | \fBTcl_ListObjLength\fR will attempt to convert it to one; |
| 404 | if the conversion fails, it returns \fBTCL_ERROR\fR |
| 405 | and leaves an error message in the interpreter's result object |
| 406 | if \fIinterp\fR is not NULL. |
| 407 | Otherwise it returns \fBTCL_OK\fR after storing the list's length. |
| 408 | .PP |
| 409 | The procedure \fBTcl_ListObjIndex\fR returns a pointer to the object |
| 410 | at element \fIindex\fR in the list referenced by \fIlistPtr\fR. |
| 411 | It returns this object by storing a pointer to it |
| 412 | in the address \fIobjPtrPtr\fR. |
| 413 | If \fIlistPtr\fR does not already refer to a list object, |
| 414 | \fBTcl_ListObjIndex\fR will attempt to convert it to one; |
| 415 | if the conversion fails, it returns \fBTCL_ERROR\fR |
| 416 | and leaves an error message in the interpreter's result object |
| 417 | if \fIinterp\fR is not NULL. |
| 418 | If the index is out of range, |
| 419 | that is, \fIindex\fR is negative or |
| 420 | greater than or equal to the number of elements in the list, |
| 421 | \fBTcl_ListObjIndex\fR stores a NULL in \fIobjPtrPtr\fR |
| 422 | and returns \fBTCL_OK\fR. |
| 423 | Otherwise it returns \fBTCL_OK\fR after storing the element's |
| 424 | object pointer. |
| 425 | The reference count for the list element is not incremented; |
| 426 | the caller must do that if it needs to retain a pointer to the element. |
| 427 | .PP |
| 428 | \fBTcl_ListObjReplace\fR replaces zero or more elements |
| 429 | of the list referenced by \fIlistPtr\fR |
| 430 | with the \fIobjc\fR objects in the array referenced by \fIobjv\fR. |
| 431 | If \fIlistPtr\fR does not point to a list object, |
| 432 | \fBTcl_ListObjReplace\fR will attempt to convert it to one; |
| 433 | if the conversion fails, it returns \fBTCL_ERROR\fR |
| 434 | and leaves an error message in the interpreter's result object |
| 435 | if \fIinterp\fR is not NULL. |
| 436 | Otherwise, it returns \fBTCL_OK\fR after replacing the objects. |
| 437 | If \fIobjv\fR is NULL, no new elements are added. |
| 438 | If the argument \fIfirst\fR is zero or negative, |
| 439 | it refers to the first element. |
| 440 | If \fIfirst\fR is greater than or equal to the |
| 441 | number of elements in the list, then no elements are deleted; |
| 442 | the new elements are appended to the list. |
| 443 | \fIcount\fR gives the number of elements to replace. |
| 444 | If \fIcount\fR is zero or negative then no elements are deleted; |
| 445 | the new elements are simply inserted before the one |
| 446 | designated by \fIfirst\fR. |
| 447 | \fBTcl_ListObjReplace\fR invalidates \fIlistPtr\fR's |
| 448 | old string representation. |
| 449 | The reference counts of any elements inserted from \fIobjv\fR |
| 450 | are incremented since the resulting list now refers to them. |
| 451 | Similarly, the reference counts for any replaced objects are decremented. |
| 452 | .PP |
| 453 | Because \fBTcl_ListObjReplace\fR combines |
| 454 | both element insertion and deletion, |
| 455 | it can be used to implement a number of list operations. |
| 456 | For example, the following code inserts the \fIobjc\fR objects |
| 457 | referenced by the array of object pointers \fIobjv\fR |
| 458 | just before the element \fIindex\fR of the list referenced by \fIlistPtr\fR: |
| 459 | .CS |
| 460 | result = Tcl_ListObjReplace(interp, listPtr, index, 0, objc, objv); |
| 461 | .CE |
| 462 | Similarly, the following code appends the \fIobjc\fR objects |
| 463 | referenced by the array \fIobjv\fR |
| 464 | to the end of the list \fIlistPtr\fR: |
| 465 | .CS |
| 466 | result = Tcl_ListObjLength(interp, listPtr, &length); |
| 467 | if (result == TCL_OK) { |
| 468 | result = Tcl_ListObjReplace(interp, listPtr, length, 0, objc, objv); |
| 469 | } |
| 470 | .CE |
| 471 | The \fIcount\fR list elements starting at \fIfirst\fR can be deleted |
| 472 | by simply calling \fBTcl_ListObjReplace\fR |
| 473 | with a NULL \fIobjvPtr\fR: |
| 474 | .CS |
| 475 | result = Tcl_ListObjReplace(interp, listPtr, first, count, 0, NULL); |
| 476 | .CE |
| 477 | |
| 478 | .SH "SEE ALSO" |
| 479 | Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult |
| 480 | |
| 481 | .SH KEYWORDS |
| 482 | append, index, insert, internal representation, length, list, list object, list type, object, object type, replace, string representation |