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/*
* Smithsonian Astrophysical Observatory, Cambridge, MA, USA
* This code has been modified under the terms listed below and is made
* available under the same terms.
*/
/*
* Copyright 1991-2004 George A Howlett.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include "tkbltOp.h"
using namespace Blt;
static int BinaryOpSearch(Blt_OpSpec *specs, int nSpecs, const char *string,
int length)
{
int low = 0;
int high = nSpecs - 1;
char c = string[0];
while (low <= high) {
int median = (low + high) >> 1;
Blt_OpSpec *specPtr = specs + median;
/* Test the first character */
int compare = c - specPtr->name[0];
if (compare == 0) {
/* Now test the entire string */
compare = strncmp(string, specPtr->name, length);
if (compare == 0) {
if ((int)length < specPtr->minChars) {
return -2; /* Ambiguous operation name */
}
}
}
if (compare < 0) {
high = median - 1;
} else if (compare > 0) {
low = median + 1;
} else {
return median; /* Op found. */
}
}
return -1; /* Can't find operation */
}
static int LinearOpSearch(Blt_OpSpec *specs, int nSpecs, const char *string,
int length)
{
char c = string[0];
int nMatches = 0;
int last = -1;
int i =0;
for (Blt_OpSpec *specPtr = specs; i<nSpecs; i++, specPtr++) {
if ((c == specPtr->name[0]) &&
(strncmp(string, specPtr->name, length) == 0)) {
last = i;
nMatches++;
if ((int)length == specPtr->minChars) {
break;
}
}
}
if (nMatches > 1)
return -2; /* Ambiguous operation name */
if (nMatches == 0)
return -1; /* Can't find operation */
return last; /* Op found. */
}
void* Blt::GetOpFromObj(Tcl_Interp* interp, int nSpecs, Blt_OpSpec *specs,
int operPos, int objc, Tcl_Obj* const objv[],
int flags)
{
Blt_OpSpec *specPtr;
int n;
if (objc <= operPos) { /* No operation argument */
Tcl_AppendResult(interp, "wrong # args: ", (char *)NULL);
usage:
Tcl_AppendResult(interp, "should be one of...", (char *)NULL);
for (n = 0; n < nSpecs; n++) {
Tcl_AppendResult(interp, "\n ", (char *)NULL);
for (int ii = 0; ii < operPos; ii++) {
Tcl_AppendResult(interp, Tcl_GetString(objv[ii]), " ",
(char *)NULL);
}
specPtr = specs + n;
Tcl_AppendResult(interp, specPtr->name, " ", specPtr->usage,
(char *)NULL);
}
return NULL;
}
int length;
const char* string = Tcl_GetStringFromObj(objv[operPos], &length);
if (flags & BLT_OP_LINEAR_SEARCH)
n = LinearOpSearch(specs, nSpecs, string, length);
else
n = BinaryOpSearch(specs, nSpecs, string, length);
if (n == -2) {
char c;
Tcl_AppendResult(interp, "ambiguous", (char *)NULL);
if (operPos > 2) {
Tcl_AppendResult(interp, " ", Tcl_GetString(objv[operPos - 1]),
(char *)NULL);
}
Tcl_AppendResult(interp, " operation \"", string, "\" matches: ",
(char *)NULL);
c = string[0];
for (n = 0; n < nSpecs; n++) {
specPtr = specs + n;
if ((c == specPtr->name[0]) &&
(strncmp(string, specPtr->name, length) == 0)) {
Tcl_AppendResult(interp, " ", specPtr->name, (char *)NULL);
}
}
return NULL;
} else if (n == -1) { /* Can't find operation, display help */
Tcl_AppendResult(interp, "bad", (char *)NULL);
if (operPos > 2) {
Tcl_AppendResult(interp, " ", Tcl_GetString(objv[operPos - 1]),
(char *)NULL);
}
Tcl_AppendResult(interp, " operation \"", string, "\": ", (char *)NULL);
goto usage;
}
specPtr = specs + n;
if ((objc < specPtr->minArgs) ||
((specPtr->maxArgs > 0) && (objc > specPtr->maxArgs))) {
int i;
Tcl_AppendResult(interp, "wrong # args: should be \"", (char *)NULL);
for (i = 0; i < operPos; i++) {
Tcl_AppendResult(interp, Tcl_GetString(objv[i]), " ",
(char *)NULL);
}
Tcl_AppendResult(interp, specPtr->name, " ", specPtr->usage, "\"",
(char *)NULL);
return NULL;
}
return specPtr->proc;
}
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