fdabef2bf15e6c3848c87824b6a55b44fbc18169
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 7
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}
72 /* subparser function */
74 element_t
*subparser (element_t
**proot
, char **pstr
, func_t func
, int nbops
, int prio
)
76 element_t
*new = newelement (func
, nbops
, prio
);
81 new->ops
[1] = parser (*pstr
, pstr
, new->prio
);
82 if (new->ops
[1] == ERROR_OP
) {
85 *proot
= newelement (Val
, 1, 4);
86 if (*proot
== ERROR_OP
) {
89 (*proot
)->ops
[0] = new;
96 element_t
*parser (char *str
, char **next
, int prio
)
98 element_t
*root
= NULL
;
101 VERBOSE (DEBUG
, PRINTOUT ("Starting parsing\n"));
104 while (*str
!= '\0') {
106 element_t
*new = NULL
;
107 VERBOSE (INFO
, PRINTOUT ("Processing: %s\n", str
));
109 /* skip spaces and tabs */
111 if ((*str
== ' ') || (*str
== '\t')) {
116 /* check for open bracket */
119 VERBOSE (DEBUG
, PRINTOUT ("start processing bracket\n"));
123 new = parser (str
+ 1, &str
, 0);
124 if (new == ERROR_OP
) {
127 for (i
= 0; i
< root
->nbops
; i
++) {
128 if (root
->ops
[i
] == NULL
) {
137 } while (*str
== ',');
139 root
= newelement (Val
, 1, 4);
143 new = parser (str
+ 1, &str
, 0);
144 if ((new == ERROR_OP
) || (*str
== ',')) {
150 VERBOSE (DEBUG
, PRINTOUT ("stop processing bracket\n"));
154 /* check for closing bracket or koma */
156 if ((*str
== ')') || (*str
== ',')) {
163 /* look for operators */
165 for (i
= 0; i
< NB_OPERATORS
; i
++) {
166 keyword_t
*operator = operators
+ i
;
167 if (codecmp (operator->keyword
, str
) == 0) {
168 VERBOSE (DEBUG
, PRINTOUT ("start processing operator\n"));
170 if ((prio
) && (prio
> operator->prio
)) {
171 VERBOSE (DEBUG
, PRINTOUT ("stop because operator priority\n"));
175 str
+= operator->offset
;
176 VERBOSE (INFO
, PRINTOUT ("Oper: %d\n", operator->func
));
177 if (subparser (&root
, &str
, operator->func
, operator->nbops
, operator->prio
) == ERROR_OP
) {
184 VERBOSE (DEBUG
, PRINTOUT ("stop processing operator\n"));
192 /* look for functions */
194 for (i
= 0; i
< NB_FUNCTIONS
; i
++) {
195 keyword_t
*function
= functions
+ i
;
196 if (codecmp (function
->keyword
, str
) == 0) {
197 VERBOSE (DEBUG
, PRINTOUT ("start processing function\n"));
199 VERBOSE (INFO
, PRINTOUT ("Func: %d\n", function
->func
));
200 new = newelement (function
->func
, function
->nbops
, function
->prio
);
208 str
+= function
->offset
;
210 VERBOSE (DEBUG
, PRINTOUT ("stop processing function\n"));
218 /* look for number */
220 if (((*str
>= '0') && (*str
<= '9')) ||
221 (*str
== '.') || (*str
== '+') || (*str
== '-')) {
222 VERBOSE (DEBUG
, PRINTOUT ("start processing value\n"));
224 float value
= strtof (str
, &pt
);
225 VERBOSE (INFO
, PRINTOUT ("Value: %f\n", value
));
228 new = newelement (Val
, 1, 4);
235 } else if (root
->func
== Val
) {
236 if ((*str
== '+') || (*str
== '-')) {
237 if ((prio
) && (prio
> 1)) {
238 VERBOSE (DEBUG
, PRINTOUT ("stop because operator priority\n"));
242 if (subparser (&root
, &str
, Add
, 2, 1) == ERROR_OP
) {
253 VERBOSE (DEBUG
, PRINTOUT ("stop processing value\n"));
270 /* print element tree */
272 void print_element (element_t
*root
, int level
)
277 if ((root
== NULL
) || (root
== ERROR_OP
)) {
281 for (i
= 0; i
< level
; i
++) {
285 switch (root
->func
) {
286 case Val
: func
= "Value"; break;
287 case Add
: func
= "Addition"; break;
288 case Sub
: func
= "Subtraction"; break;
289 case Mul
: func
= "Multiplication"; break;
290 case Div
: func
= "Division"; break;
291 case Mod
: func
= "Modulo"; break;
292 case Pow
: func
= "Power"; break;
293 case Sqr
: func
= "Square Root"; break;
294 case Cos
: func
= "Cosine"; break;
295 case Sin
: func
= "Sine"; break;
296 case Atn
: func
= "Arc Tangent"; break;
297 case Log
: func
= "Logarithm"; break;
298 case Exp
: func
= "Exponantial"; break;
301 PRINTOUT ("Function: %s\n", func
);
303 if ((root
->func
== Val
) && (root
->ops
[0] == NULL
)) {
304 for (i
= 0; i
< level
; i
++) {
307 PRINTOUT ("value: %f\n", root
->value
);
309 for (i
= 0; i
< root
->nbops
; i
++) {
310 print_element (root
->ops
[i
], level
+ 1);
315 /* evaluate element tree */
317 double evaluate_element (element_t
*root
)
319 double op0
= 0, op1
= 0;
321 if ((root
== NULL
) || (root
== ERROR_OP
)) {
322 VERBOSE (WARNING
, PRINTOUT ("error while evaluating\n"));
326 switch (root
->func
) {
329 return evaluate_element (root
->ops
[0]);
341 op1
= evaluate_element (root
->ops
[1]);
343 VERBOSE (WARNING
, PRINTOUT ("error while evaluating (op[1])\n"));
354 op0
= evaluate_element (root
->ops
[0]);
356 VERBOSE (WARNING
, PRINTOUT ("error while evaluating (op[0])\n"));
361 switch (root
->func
) {
362 case Add
: return op0
+ op1
;
363 case Sub
: return op0
- op1
;
364 case Mul
: return op0
* op1
;
365 case Div
: return op0
/ op1
;
366 case Mod
: return fmod (op0
, op1
);
367 case Pow
: return pow (op0
, op1
);
368 case Sqr
: return sqrt (op0
);
369 case Cos
: return cos (op0
);
370 case Sin
: return sin (op0
);
371 case Atn
: return atan (op0
);
372 case Log
: return log (op0
);
373 case Exp
: return exp (op0
);
380 /* vim: set ts=4 sw=4 et: */