1d35b4c44785dc85eee79b7600b2c62eebb40910
12 int codecmp (char *ref
, char *str
)
16 while (*ref
!= '\0') {
18 sig
= (*str
== '.') ? -1 : ((*str
>= '0') && (*str
<= '9'));
23 return (sig
> 0) ? 1 : -1;
32 /* allocate new element */
34 element_t
*newelement (func_t function
, int nbops
, int prio
)
36 element_t
*new = (element_t
*) calloc (1, sizeof (element_t
));
38 VERBOSE (ERROR
, fdprintf (stdfderr
, "can't allocate memory\n"));
50 #define NB_OPERATORS 6
52 keyword_t operators
[NB_OPERATORS
] = {
53 { "+\t", Add
, 2, 1, 1},
54 { "-\t", Sub
, 2, 1, 1},
61 #define NB_FUNCTIONS 9
62 keyword_t functions
[NB_FUNCTIONS
] = {
63 { "sqrt", Sqr
, 1, 4, 5},
64 { "pow", Pow
, 2, 3, 5},
65 { "cos", Cos
, 1, 3, 5},
66 { "sin", Sin
, 1, 3, 5},
67 { "atan", Atn
, 1, 4, 5},
68 { "exp", Exp
, 1, 3, 5},
69 { "log", Log
, 1, 3, 5},
70 { "quit", Qui
, 0, 4, 5},
71 { "help", Hel
, 0, 4, 5}
74 /* subparser function */
76 element_t
*subparser (element_t
**proot
, char **pstr
, func_t func
, int nbops
, int prio
)
78 element_t
*new = newelement (func
, nbops
, prio
);
83 new->ops
[1] = parser (*pstr
, pstr
, new->prio
);
84 if (new->ops
[1] == ERROR_OP
) {
87 *proot
= newelement (Val
, 1, 5);
88 if (*proot
== ERROR_OP
) {
91 (*proot
)->ops
[0] = new;
98 element_t
*parser (char *str
, char **next
, int prio
)
100 element_t
*root
= NULL
;
103 VERBOSE (DEBUG
, PRINTOUT ("Starting parsing\n"));
106 while (*str
!= '\0') {
108 element_t
*new = NULL
;
109 VERBOSE (INFO
, PRINTOUT ("Processing: %s\n", str
));
111 /* skip spaces and tabs */
113 if ((*str
== ' ') || (*str
== '\t')) {
118 /* check for open bracket */
121 VERBOSE (DEBUG
, PRINTOUT ("start processing bracket\n"));
125 new = parser (str
+ 1, &str
, 0);
126 if (new == ERROR_OP
) {
129 for (i
= 0; i
< root
->nbops
; i
++) {
130 if (root
->ops
[i
] == NULL
) {
139 } while (*str
== ',');
141 root
= newelement (Val
, 1, 5);
145 new = parser (str
+ 1, &str
, 0);
146 if ((new == ERROR_OP
) || (*str
== ',')) {
152 VERBOSE (DEBUG
, PRINTOUT ("stop processing bracket\n"));
156 /* check for closing bracket or koma */
158 if ((*str
== ')') || (*str
== ',')) {
165 /* look for operators */
167 for (i
= 0; i
< NB_OPERATORS
; i
++) {
168 keyword_t
*operator = operators
+ i
;
169 if (codecmp (operator->keyword
, str
) == 0) {
170 VERBOSE (DEBUG
, PRINTOUT ("start processing operator\n"));
172 if ((prio
) && (prio
> operator->prio
)) {
173 VERBOSE (DEBUG
, PRINTOUT ("stop because operator priority\n"));
177 str
+= operator->offset
;
178 VERBOSE (INFO
, PRINTOUT ("Oper: %d\n", operator->func
));
179 if (subparser (&root
, &str
, operator->func
, operator->nbops
, operator->prio
) == ERROR_OP
) {
182 } else if (*str
== '-') {
183 new = newelement (Sig
, 1, 9);
192 VERBOSE (DEBUG
, PRINTOUT ("stop processing operator\n"));
200 /* look for functions */
202 for (i
= 0; i
< NB_FUNCTIONS
; i
++) {
203 keyword_t
*function
= functions
+ i
;
204 if (codecmp (function
->keyword
, str
) == 0) {
205 VERBOSE (DEBUG
, PRINTOUT ("start processing function\n"));
207 VERBOSE (INFO
, PRINTOUT ("Func: %d\n", function
->func
));
208 new = newelement (function
->func
, function
->nbops
, function
->prio
);
216 str
+= function
->offset
;
218 VERBOSE (DEBUG
, PRINTOUT ("stop processing function\n"));
226 /* look for number */
228 if (((*str
>= '0') && (*str
<= '9')) ||
229 (*str
== '.') || (*str
== '+') || (*str
== '-')) {
230 VERBOSE (DEBUG
, PRINTOUT ("start processing value\n"));
232 float value
= strtof (str
, &pt
);
233 VERBOSE (INFO
, PRINTOUT ("Value: %f\n", value
));
236 new = newelement (Val
, 1, 5);
243 } else if (root
->func
== Val
) {
244 if ((*str
== '+') || (*str
== '-')) {
245 if ((prio
) && (prio
> 1)) {
246 VERBOSE (DEBUG
, PRINTOUT ("stop because operator priority\n"));
250 if (subparser (&root
, &str
, Add
, 2, 1) == ERROR_OP
) {
261 VERBOSE (DEBUG
, PRINTOUT ("stop processing value\n"));
278 /* print element tree */
280 void print_element (element_t
*root
, int level
)
285 if ((root
== NULL
) || (root
== ERROR_OP
)) {
289 for (i
= 0; i
< level
; i
++) {
293 switch (root
->func
) {
294 case Val
: func
= "Value"; break;
295 case Sig
: func
= "Sign"; break;
296 case Add
: func
= "Addition"; break;
297 case Sub
: func
= "Subtraction"; break;
298 case Mul
: func
= "Multiplication"; break;
299 case Div
: func
= "Division"; break;
300 case Mod
: func
= "Modulo"; break;
301 case Pow
: func
= "Power"; break;
302 case Sqr
: func
= "Square Root"; break;
303 case Cos
: func
= "Cosine"; break;
304 case Sin
: func
= "Sine"; break;
305 case Atn
: func
= "Arc Tangent"; break;
306 case Log
: func
= "Logarithm"; break;
307 case Exp
: func
= "Exponantial"; break;
308 case Qui
: func
= "Quit"; break;
309 case Hel
: func
= "Help"; break;
312 PRINTOUT ("Function: %s\n", func
);
314 if ((root
->func
== Val
) && (root
->ops
[0] == NULL
)) {
315 for (i
= 0; i
< level
; i
++) {
318 PRINTOUT ("value: %f\n", root
->value
);
320 for (i
= 0; i
< root
->nbops
; i
++) {
321 print_element (root
->ops
[i
], level
+ 1);
338 PRINTOUT ("calc is a simple calculator\n\n");
339 PRINTOUT ("supported operators:\n");
340 PRINTOUT (" + - * / % ^\n\n");
341 PRINTOUT ("supported functions:\n");
342 PRINTOUT (" pow sqrt cos sin atan log exp\n\n");
343 PRINTOUT ("miscellaneous functions:\n");
344 PRINTOUT (" quit help\n");
347 /* evaluate element tree */
352 double evaluate_element (element_t
*root
, char mask
)
354 double op0
= 0, op1
= 0;
355 char nextmask
= mask
;
357 if ((root
== NULL
) || (root
== ERROR_OP
)) {
358 VERBOSE (WARNING
, PRINTOUT ("error while evaluating\n"));
362 /* mask to manage sub operator sub and div */
363 switch (root
->func
) {
365 nextmask
&= ~MASK_SUB
;
366 nextmask
&= ~MASK_DIV
;
369 nextmask
|= MASK_SUB
;
370 nextmask
&= ~MASK_DIV
;
373 nextmask
&= ~MASK_DIV
;
376 nextmask
|= MASK_DIV
;
382 switch (root
->func
) {
385 op0
= (root
->ops
[0]) ? evaluate_element (root
->ops
[0], nextmask
) : root
->value
;
394 op1
= evaluate_element (root
->ops
[1], nextmask
);
396 VERBOSE (WARNING
, PRINTOUT ("error while evaluating (op[1])\n"));
407 op0
= evaluate_element (root
->ops
[0], 0);
409 VERBOSE (WARNING
, PRINTOUT ("error while evaluating (op[0])\n"));
418 switch (root
->func
) {
419 case Val
: return op0
;
420 case Sig
: return -op0
;
421 case Add
: return ((mask
& MASK_SUB
) == 0) ? op0
+ op1
: op0
- op1
;
422 case Sub
: return ((mask
& MASK_SUB
) == 0) ? op0
- op1
: op0
+ op1
;
423 case Mul
: return ((mask
& MASK_DIV
) == 0) ? op0
* op1
: op0
/ op1
;
424 case Div
: return ((mask
& MASK_DIV
) == 0) ? op0
/ op1
: op0
* op1
;
425 case Mod
: return fmod (op0
, op1
);
426 case Pow
: return pow (op0
, op1
);
427 case Sqr
: return sqrt (op0
);
428 case Cos
: return cos (op0
);
429 case Sin
: return sin (op0
);
430 case Atn
: return atan (op0
);
431 case Log
: return log (op0
);
432 case Exp
: return exp (op0
);
433 case Qui
: quit (); break;
434 case Hel
: help (); break;
440 /* vim: set ts=4 sw=4 et: */