X-Git-Url: https://secure.softndesign.org/git/?a=blobdiff_plain;f=parser.c;h=9e7e51013e3a050f04a8c48c9e28aa1e971be542;hb=a67f1cfd7bb89dfd00cdc099651b81456ca4c327;hp=48fb98009b9ace46f0df19152c1a0ed8a4957a51;hpb=49223129746bcb9981bba5b359af3f17731f6235;p=calc.git diff --git a/parser.c b/parser.c index 48fb980..9e7e510 100644 --- a/parser.c +++ b/parser.c @@ -1,11 +1,29 @@ #include +#include +#include #include +#include #include "debug.h" -#include "fdprintf.h" #include "parser.h" +/* global variables */ + +double answer = 0; + +#define DEFAULT_STORAGE_SIZE 10 +int storage_size = -1; + +double *storage = NULL; + +#define DEFAULT_FORMAT "=> %.6g\n" +char *format = NULL; +char *minform = NULL; + +workspace_t *programs = NULL; +int nb_programs = 0; + /* compare codes */ int codecmp (char *ref, char *str) @@ -13,69 +31,198 @@ int codecmp (char *ref, char *str) int sig; while (*ref != '\0') { - sig = *str++ - *ref++; + if (*ref == '\t') { + sig = (*str == '.') ? -1 : ((*str >= '0') && (*str <= '9')); + } else { + sig = *str - *ref; + } if (sig != 0) { return (sig > 0) ? 1 : -1; } + str++; + ref++; } return 0; } -/* allocate new element */ +/* calloc or die function */ -element_t *newelement (func_t function, int nbops) +void *callocordie (size_t count, size_t size) { - element_t *new = (element_t *) calloc (1, sizeof (element_t)); - if (new == NULL) { - VERBOSE (ERROR, fdprintf (stdfderr, "can't allocate memory\n")); + if (count * size == 0) { return NULL; } + void *new = calloc (count, size); + if (new == NULL) { + VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); + exit (1); + } + return new; +} + +/* allocate new element */ + +element_t *newelement (func_t function, int nbops, int prio) +{ + element_t *new = (element_t *) callocordie (1, sizeof (element_t)); + if (nbops) { + new->ops = (element_t **) callocordie (nbops, sizeof (element_t *)); + } new->func = function; new->nbops = nbops; + new->prio = prio; return new; } -/* functions */ +/* desallocate element */ + +void delelement (element_t *root) +{ + if ((root != NULL) && (root != ERROR_OP)) { + int i; + for (i = 0; i < root->nbops; i++) { + delelement (root->ops[i]); + } + if (root->nbops) { + free (root->ops); + } + free (root); + } +} -#define NB_OPERATORS 7 +/* duplicate element */ +element_t *dupelement (element_t *root) +{ + element_t *tmp = NULL; + int i; + + if ((root == NULL) || (root == ERROR_OP)) { + return root; + } + tmp = newelement (root->func, root->nbops, root->prio); + tmp->value = root->value; + for (i = 0; i < root->nbops; i++) { + tmp->ops[i] = dupelement (root->ops[i]); + } + return tmp; +} + +/* functions */ + +#define NB_OPERATORS 14 keyword_t operators[NB_OPERATORS] = { - { "+ ", Add, 2, 1 }, - { "+\t", Add, 2, 1 }, - { "- ", Sub, 2, 1 }, - { "-\t", Sub, 2, 1 }, - { "*", Mul, 2, 1 }, - { "/", Div, 2, 1 }, - { "^", Pow, 2, 1 } + { "+\t", Add, 2, 1, 1}, + { "-\t", Sub, 2, 1, 1}, + { "*", Mul, 2, 1, 2}, + { "/", Div, 2, 1, 2}, + { "%", Mod, 2, 1, 3}, + { "^", Pow, 2, 1, 4}, + { "==", Equal, 2, 2, -1}, + { "!=", Diff, 2, 2, -1}, + { ">=", Ge, 2, 2, -1}, + { "<=", Le, 2, 2, -1}, + { ">", Gt, 2, 1, -1}, + { "<", Lt, 2, 1, -1}, + { "&", And, 2, 1, -2}, + { "|", Or, 2, 1, -2} }; -#define NB_FUNCTIONS 7 +#define NB_FUNCTIONS 31 keyword_t functions[NB_FUNCTIONS] = { - { "sqrt", Sqr, 1, 4 }, - { "pow", Pow, 2, 3 }, - { "cos", Cos, 1, 3 }, - { "sin", Sin, 1, 3 }, - { "atan", Atn, 1, 4 }, - { "exp", Exp, 1, 3 }, - { "log", Log, 1, 3 } + { "sqrt", Sqr, 1, 4, 5}, + { "pow", Pow, 2, 3, 5}, + { "cos", Cos, 1, 3, 5}, + { "sin", Sin, 1, 3, 5}, + { "tan", Tan, 1, 3, 5}, + { "acos", Acos, 1, 4, 5}, + { "asin", Asin, 1, 4, 5}, + { "atan", Atan, 1, 4, 5}, + { "log", Log, 1, 3, 5}, + { "exp", Exp, 1, 3, 5}, + { "abs", Abs, 1, 3, 5}, + { "floor", Floor, 1, 5, 5}, + { "ceil", Ceil, 1, 4, 5}, + { "sto", Store, 2, 3, 5}, + { "rcl", Recall, 1, 3, 5}, + { "inc", Inc, 1, 3, 5}, + { "dec", Dec, 1, 3, 5}, + { "disp", Disp, 0, 4, 9}, + { "mem", Mem, 1, 3, 9}, + { "clr", Clear, 0, 3, 9}, + { "quit", Quit, 0, 4, 9}, + { "help", Help, 0, 4, 9}, + { "!", Not, 1, 1, 6}, + { "cond", Cond, 3, 4, 5}, + { "while", While, 2, 5, 5}, + { "print", Print, 1, 5, 5}, + { "prog", Prog, 3, 4, 9}, + { "call", Call, 10, 4, 5}, + { "ls", List, 0, 2, 9}, + { "edit", Edit, 1, 4, 9}, + { "del", Del, 1, 3, 9} +}; + +#define NB_CONSTANTS 3 +keyword_t constants[NB_CONSTANTS] = { + { "ans", Ans, 0, 3, 5}, + { "e", E, 0, 1, 5}, + { "pi", Pi, 0, 2, 5} +}; + +#define NB_SYMBOLS 4 +char *symbols[NB_SYMBOLS] = { + "(", ")", "{", "}" }; +/* subparser function */ + +element_t *subparser (element_t **proot, char **pstr, func_t func, int nbops, int prio) +{ + element_t *new = newelement (func, nbops, prio); + new->ops[0] = *proot; + new->ops[1] = parser (*pstr, pstr, new->prio); + if ((new->ops[1] == NULL) || ((new->ops[1] != ERROR_OP) && (new->ops[1]->prio == 9))) { + delelement (new->ops[1]); + new->ops[1] = ERROR_OP; + } + if (new->ops[1] == ERROR_OP) { + delelement (new); + *proot = NULL; + return ERROR_OP; + } + *proot = newelement (Val, 1, 5); + (*proot)->ops[0] = new; + + return *proot; +} + /* parser function */ -element_t *parser (char *str, char **next) +element_t *parser (char *str, char **next, int prio) { element_t *root = NULL; - int i, j; + char *string = str; + int i; - VERBOSE (DEBUG, PRINTOUT ("Starting parsing\n")); + VERBOSE (DEBUG, fprintf (stdout, "Starting parsing\n")); /* main loop */ while (*str != '\0') { int found = 0; element_t *new = NULL; - VERBOSE (INFO, PRINTOUT ("Processing: %s\n", str)); + VERBOSE (INFO, fprintf (stdout, "Processing: %s\n", str)); + + /* end without printing */ + + if (*str == ';') { + if (root) { + root->hidden = 1; + } + break; + } /* skip spaces and tabs */ @@ -84,57 +231,106 @@ element_t *parser (char *str, char **next) continue; } - /* skip commas */ + /* check for open brace */ - if (*str == ',') { - if (root == NULL) { + if (*str == '{') { + VERBOSE (DEBUG, fprintf (stdout, "start processing brace\n")); + if (root != NULL) { + delelement (root); + return ERROR_OP; + } + root = newelement (Code, 0, 5); + + do { + new = parser (str + 1, &str, 0); + if ((new == NULL) || ((new != ERROR_OP) && (new->prio == 9))) { + delelement (new); + new = ERROR_OP; + } + if (new == ERROR_OP) { + delelement (root); + return ERROR_OP; + } + element_t *newprog = newelement (Code, root->nbops + 1, 5); + for (i = 0; i < root->nbops; i++) { + newprog->ops[i] = root->ops[i]; + root->ops[i] = NULL; + } + newprog->ops[root->nbops] = new; + delelement (root); + root = newprog; + } while (*str == ','); + + if (*str != '}') { + delelement (root); return ERROR_OP; - } else if (root->func != Set) { - new = newelement (Set, MAX_OPERANDS); - new->ops[0] = root; - root = new; } str++; + VERBOSE (DEBUG, fprintf (stdout, "stop processing brace\n")); continue; } - /* check for parent */ + /* check for open bracket */ if (*str == '(') { - VERBOSE (DEBUG, PRINTOUT ("start processing bracket\n")); - new = parser (str + 1, &str); - if (new == ERROR_OP) { - return ERROR_OP; - } + VERBOSE (DEBUG, fprintf (stdout, "start processing bracket\n")); if (root) { - for (i = 0, j = 0; i < root->nbops; i++) { - if (root->ops[i] == NULL) { - if (new->func == Set) { - root->ops[i] = new->ops[j++]; - if (new->ops[j] == NULL) { - found = 1; - break; - } - } else { + do { + found = 0; + new = parser (str + 1, &str, 0); + if ((new == NULL) || ((new != ERROR_OP) && (new->prio == 9))) { + delelement (new); + new = ERROR_OP; + } + if ((new == NULL) || (new == ERROR_OP)) { + delelement (root); + return ERROR_OP; + } + for (i = 0; i < root->nbops; i++) { + if (root->ops[i] == NULL) { root->ops[i] = new; found = 1; break; } } + if (!found) { + delelement (new); + delelement (root); + return ERROR_OP; + } + } while (*str == ','); + } else { + root = newelement (Val, 1, 5); + new = parser (str + 1, &str, 0); + if ((new == NULL) || ((new != ERROR_OP) && (new->prio == 9))) { + delelement (new); + new = ERROR_OP; } - if (!found) { + if ((new == NULL) || (new == ERROR_OP) || (*str == ',')) { + delelement (new); + delelement (root); return ERROR_OP; } + root->ops[0] = new; } - VERBOSE (DEBUG, PRINTOUT ("stop processing bracket\n")); - if (next != NULL) { - *next = str; + if (*str != ')') { + delelement (root); + return ERROR_OP; } - return root; + str++; + VERBOSE (DEBUG, fprintf (stdout, "stop processing bracket\n")); + continue; } - if (*str == ')') { + + /* check for closing bracket, closing brace or koma */ + + if ((*str == ')') || (*str == '}') || (*str == ',')) { + if (prio == -9) { + delelement (root); + return ERROR_OP; + } if (next != NULL) { - *next = str + 1; + *next = str; } return root; } @@ -144,26 +340,26 @@ element_t *parser (char *str, char **next) for (i = 0; i < NB_OPERATORS; i++) { keyword_t *operator = operators + i; if (codecmp (operator->keyword, str) == 0) { - VERBOSE (DEBUG, PRINTOUT ("start processing operator\n")); - str += operator->offset; - if ((root) && (root->func != Set)) { - VERBOSE (INFO, PRINTOUT ("Oper: %d\n", operator->func)); - new = newelement (operator->func, operator->nbops); - if (new == NULL) { - return ERROR_OP; + VERBOSE (DEBUG, fprintf (stdout, "start processing operator\n")); + if (root) { + if ((prio) && (prio > operator->prio)) { + VERBOSE (DEBUG, fprintf (stdout, "stop because operator priority\n")); + *next = str; + return root; } - new->ops[0] = root; - root = new; - new = parser (str, &str); - if (new == ERROR_OP) { + str += operator->offset; + VERBOSE (INFO, fprintf (stdout, "Oper: %d\n", operator->func)); + if (subparser (&root, &str, operator->func, operator->nbops, operator->prio) == ERROR_OP) { + delelement (root); return ERROR_OP; } - root->ops[1] = new; + } else if (*str == '-') { + root = newelement (Sig, 1, 9); } else { return ERROR_OP; } found = 1; - VERBOSE (DEBUG, PRINTOUT ("stop processing operator\n")); + VERBOSE (DEBUG, fprintf (stdout, "stop processing operator\n")); break; } } @@ -176,20 +372,17 @@ element_t *parser (char *str, char **next) for (i = 0; i < NB_FUNCTIONS; i++) { keyword_t *function = functions + i; if (codecmp (function->keyword, str) == 0) { - VERBOSE (DEBUG, PRINTOUT ("start processing function\n")); + VERBOSE (DEBUG, fprintf (stdout, "start processing function\n")); if (root == NULL) { - VERBOSE (INFO, PRINTOUT ("Func: %d\n", function->func)); - new = newelement (function->func, function->nbops); - if (new == NULL) { - return ERROR_OP; - } - root = new; - } else { + VERBOSE (INFO, fprintf (stdout, "Func: %d\n", function->func)); + root = newelement (function->func, function->nbops, function->prio); + } else { + delelement (root); return ERROR_OP; } str += function->offset; found = 1; - VERBOSE (DEBUG, PRINTOUT ("stop processing function\n")); + VERBOSE (DEBUG, fprintf (stdout, "stop processing function\n")); break; } } @@ -197,64 +390,81 @@ element_t *parser (char *str, char **next) continue; } - /* last attend to detect addition and substraction */ + /* look for constant */ - if (((*str == '-') || (*str == '+')) && - ((*(str + 1) >= '0') && (*(str + 1) <= '9')) && - ((root) && (root->func == Val))) { - VERBOSE (INFO, PRINTOUT ("Oper: %d\n", Add)); - new = newelement (Add, 2); - if (new == NULL) { - return ERROR_OP; + for (i = 0; i < NB_CONSTANTS; i++) { + keyword_t *constant = constants + i; + if (codecmp (constant->keyword, str) == 0) { + VERBOSE (DEBUG, fprintf (stdout, "start processing constant\n")); + if (root == NULL) { + VERBOSE (INFO, fprintf (stdout, "Const: %d\n", constant->func)); + root = newelement (constant->func, constant->nbops, constant->prio); + } else { + delelement (root); + return ERROR_OP; + } + str += constant->offset; + found = 1; + VERBOSE (DEBUG, fprintf (stdout, "stop processing constant\n")); + break; } - new->ops[0] = root; - root = new; + } + if (found) { + continue; } /* look for number */ - if (((*str >= '0') && (*str <= '9')) || (*str == '.')) { - VERBOSE (DEBUG, PRINTOUT ("start processing value\n")); + if (((*str >= '0') && (*str <= '9')) || + (*str == '.') || (*str == '+') || (*str == '-')) { + VERBOSE (DEBUG, fprintf (stdout, "start processing value\n")); char *pt; - float value = strtof (str, &pt); - VERBOSE (INFO, PRINTOUT ("Value: %f\n", value)); + double value = strtod (str, &pt); + VERBOSE (INFO, fprintf (stdout, "Value: %f\n", value)); if (str != pt) { - new = newelement (Val, 1); - if (new == NULL) { - return ERROR_OP; - } - new->value = value; - if (root == NULL) { - root = new; - } else { - if (root->func == Val) { - element_t *set = newelement (Set, MAX_OPERANDS); - if (set == NULL) { + if ((root == NULL) || (root->prio == 6)) { + new = newelement (Val, 1, 5); + new->value = value; + if (root == NULL) { + root = new; + } else { + for (i = 0; i < root->nbops; i++) { + if (root->ops[i] == NULL) { + root->ops[i] = new; + found = 1; + break; + } + } + if (!found) { + delelement (new); + delelement (root); return ERROR_OP; } - set->ops[0] = root; - root = set; } - for (i = 0; i < root->nbops; i++) { - if (root->ops[i] == NULL) { - root->ops[i] = new; - found = 1; - break; - } + str = pt; + } else if ((*str == '+') || (*str == '-')) { + if ((prio) && (prio > 1)) { + VERBOSE (DEBUG, fprintf (stdout, "stop because operator priority\n")); + *next = str; + return root; } - if (!found) { + if (subparser (&root, &str, Add, 2, 1) == ERROR_OP) { + delelement (root); return ERROR_OP; } + } else { + delelement (root); + return ERROR_OP; } - str = pt; found = 1; } - VERBOSE (DEBUG, PRINTOUT ("stop processing value\n")); + VERBOSE (DEBUG, fprintf (stdout, "stop processing value\n")); } /* error */ if (!found) { + delelement (root); return ERROR_OP; } @@ -263,6 +473,12 @@ element_t *parser (char *str, char **next) if (next != NULL) { *next = str; } + + /* save string */ + if (root != NULL) { + root->string = string; + } + return root; } @@ -278,32 +494,69 @@ void print_element (element_t *root, int level) } for (i = 0; i < level; i++) { - PRINTOUT (" "); + fprintf (stdout, " "); } switch (root->func) { case Val: func = "Value"; break; - case Set: func = "Set"; break; + case Sig: func = "Sign"; break; case Add: func = "Addition"; break; case Sub: func = "Subtraction"; break; case Mul: func = "Multiplication"; break; case Div: func = "Division"; break; + case Mod: func = "Modulo"; break; case Pow: func = "Power"; break; case Sqr: func = "Square Root"; break; case Cos: func = "Cosine"; break; case Sin: func = "Sine"; break; - case Atn: func = "Arc Tangent"; break; + case Tan: func = "Tangent"; break; + case Acos: func = "Arc Cosine"; break; + case Asin: func = "Arc Sine"; break; + case Atan: func = "Arc Tangent"; break; case Log: func = "Logarithm"; break; case Exp: func = "Exponantial"; break; + case Abs: func = "Absolute value"; break; + case Ceil: func = "Ceil value"; break; + case Floor: func = "Floor value"; break; + case Store: func = "Store"; break; + case Recall: func = "Recall"; break; + case Inc: func = "Increase"; break; + case Dec: func = "Decrease"; break; + case Disp: func = "Display"; break; + case Mem: func = "Memory"; break; + case Clear: func = "Clear"; break; + case Quit: func = "Quit"; break; + case Help: func = "Help"; break; + case Ans: func = "Ans"; break; + case Pi: func = "Pi"; break; + case E: func = "E"; break; + case Equal: func = "Equal"; break; + case Diff: func = "Different"; break; + case Ge: func = "Greater or equal"; break; + case Le: func = "Lesser or equal"; break; + case Gt: func = "Greater"; break; + case Lt: func = "Lesser"; break; + case And: func = "And"; break; + case Or: func = "Or"; break; + case Not: func = "Not"; break; + case Cond: func = "Condition"; break; + case While: func = "While"; break; + case Code: func = "Code"; break; + case Print: func = "Print"; break; + case Prog: func = "Program"; break; + case Call: func = "Call"; break; + case List: func = "List"; break; + case Edit: func = "Edit"; break; + case Del: func = "Del"; break; } - PRINTOUT ("Function: %s\n", func); + fprintf (stdout, "Function: %s\n", func); - if (root->func == Val) { + if ((root->func == Val) && (root->ops[0] == NULL)) { for (i = 0; i < level; i++) { - PRINTOUT (" "); + fprintf (stdout, " "); } - PRINTOUT ("value: %f\n", root->value); + fprintf (stdout, "value: %f\n", root->value); } else { for (i = 0; i < root->nbops; i++) { print_element (root->ops[i], level + 1); @@ -311,4 +564,658 @@ void print_element (element_t *root, int level) } } +/* storage functions */ + +void memory (int nb) +{ + int i, l; + double *tmp = NULL; + if (nb != storage_size) { + l = (nb < storage_size) ? nb : storage_size; + tmp = (double *) callocordie (nb, sizeof (double)); + for (i = 0; i < l; i++) { + tmp[i] = storage[i]; + } + if (storage != NULL) { + free (storage); + } + storage = tmp; + storage_size = nb; + } +} + +double store (int index, double value) +{ + if (storage_size == -1) { + memory (DEFAULT_STORAGE_SIZE); + } + if ((index > 0) && (index <= storage_size)) { + storage[index - 1] = value; + } else { + VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [%d, %d]\n", index, (storage_size) ? 1 : 0, storage_size)); + } + return value; +} + +double recall (int index) +{ + if (storage_size == -1) { + memory (DEFAULT_STORAGE_SIZE); + } + if ((index > 0) && (index <= storage_size)) { + return storage[index - 1]; + } else { + VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [%d, %d]\n", index, (storage_size) ? 1 : 0, storage_size)); + } + return 0; +} + +double increase (int index) +{ + if (storage_size == -1) { + memory (DEFAULT_STORAGE_SIZE); + } + if ((index > 0) && (index <= storage_size)) { + return storage[index - 1]++; + } else { + VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [%d, %d]\n", index, (storage_size) ? 1 : 0, storage_size)); + } + return 0; +} + +double decrease (int index) +{ + if (storage_size == -1) { + memory (DEFAULT_STORAGE_SIZE); + } + if ((index > 0) && (index <= storage_size)) { + return storage[index - 1]--; + } else { + VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [%d, %d]\n", index, (storage_size) ? 1 : 0, storage_size)); + } + return 0; +} + +void display (void) +{ + int i; + if (storage_size == -1) { + memory (DEFAULT_STORAGE_SIZE); + } + fprintf (stdout, "storage:"); + for (i = 0; i < storage_size; i++) { + fprintf (stdout, " "); + fprintf (stdout, minform, storage[i]); + } + fprintf (stdout, "\n"); +} + +void clear () +{ + int i; + for (i = 0; i < storage_size; i++) { + storage[i] = 0; + } +} + +/* While do function */ + +double while_do (element_t *cond, element_t *action) +{ + double ret = 0; + element_t *temp = NULL; + + VERBOSE (DEBUG, fprintf (stdout, "starting while loop\n")); + while (1) { + VERBOSE (DEBUG, fprintf (stdout, "loop...\n")); + + temp = dupelement (cond); + double test = evaluate_element (temp, 0); + delelement (temp); + if (!test) { + break; + } + if (action) { + temp = dupelement (action); + ret = evaluate_element (temp, 0); + delelement (temp); + } + } + + VERBOSE (DEBUG, fprintf (stdout, "ending while loop\n")); + + return ret; +} + +/* program function */ + +double execute_code (element_t **prog, int nbcalls) +{ + double ret = 0; + int i; + for (i = 0; i < nbcalls; i++) { + ret = evaluate_element (prog[i], 0); + } + return ret; +} + +/* print function */ + +void set_format (char *prompt, int precision) +{ + char buffer[128] = {0}; + free_format (); + sprintf (buffer, "%s%%.%dg\n", prompt, precision); + format = strdup (buffer); + sprintf (buffer, "%%.%dg", precision); + minform = strdup (buffer); +} + +void free_format () +{ + if (format) { + free (format); + format = NULL; + } + if (minform) { + free (minform); + minform = NULL; + } +} + +double print (double value) +{ + fprintf (stdout, format ? format : DEFAULT_FORMAT, value); + fflush (stdout); + return value; +} + +/* quit function */ + +void quit (void) +{ + fprintf (stdout, "bye\n"); + exit (0); +} + +/* program function */ + +void prog (int id, int nbmems, element_t *root) +{ + int i, n = -1; + + if (programs == NULL) { + + /* initial memory allocation */ + programs = (workspace_t *) callocordie (1, sizeof (workspace_t)); + nb_programs = 1; + n = 0; + + } else { + + /* look for existing program */ + for (i = 0; i < nb_programs; i++) { + if ((programs + i)->id == id) { + n = i; + break; + } + } + if (n == -1) { + + /* new program */ + n = nb_programs++; + workspace_t *tmp = (workspace_t *) callocordie (nb_programs, sizeof (workspace_t)); + memcpy (tmp, programs, (nb_programs - 1) * sizeof (workspace_t)); + free (programs); + programs = tmp; + } else { + + /* clean old program */ + if ((programs + n)->storage) { + free ((programs + n)->storage); + } + if ((programs + n)->root) { + delelement ((programs + n)->root); + } + if ((programs + n)->string) { + free ((programs + n)->string); + (programs + n)->string = NULL; + } + } + } + + /* set program */ + (programs + n)->id = id; + (programs + n)->answer = 0; + (programs + n)->storage = (double *) callocordie (nbmems, sizeof (double)); + (programs + n)->storage_size = nbmems; + (programs + n)->root = dupelement (root); +} + +double call (int id, int nbops, element_t **ops) +{ + workspace_t tmp = {0}; + int i, n = -1; + double ret = 0; + + if (programs) { + + /* look for program */ + for (i = 0; i < nb_programs; i++) { + if ((programs + i)->id == id) { + n = i; + break; + } + } + } + if (n == -1) { + VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id)); + return 0; + } + + /* store context */ + tmp.answer = answer; + tmp.storage = storage; + tmp.storage_size = storage_size; + + /* change context */ + answer = 0; + storage = (programs + n)->storage; + storage_size = (programs + n)->storage_size; + if (nbops > storage_size) { + double *tmp = (double *) callocordie (nbops, sizeof (double)); + memcpy (tmp, storage, storage_size * sizeof (double)); + free (storage); + (programs + n)->storage = storage = tmp; + (programs + n)->storage_size = storage_size = nbops; + } + for (i = 0; i < nbops; i++) { + double val = evaluate_element (ops[i], 0); + store (i + 1, val); + } + + /* evaluate program */ + element_t *elements = dupelement ((programs + n)->root); + ret = evaluate_element (elements, 0); + delelement (elements); + + /* restore context */ + answer = tmp.answer; + storage = tmp.storage; + storage_size = tmp.storage_size; + + return ret; +} + +void list () +{ + int i; + fprintf (stdout, "programs:"); + for (i = 0; i < nb_programs; i++) { + fprintf (stdout, " %d", (programs + i)->id); + } + fprintf (stdout, "\n"); +} + +void edit (int id) +{ + int i, n = -1; + + if (programs) { + + /* look for program */ + for (i = 0; i < nb_programs; i++) { + if ((programs + i)->id == id) { + n = i; + break; + } + } + } + if (n == -1) { + VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id)); + return; + } + + /* set string program */ + fprintf (stdout, "edit: %s\n", (programs + n)->string); +} + +void savestring (int id, char *string) +{ + int i, n = -1; + + if (programs) { + + /* look for program */ + for (i = 0; i < nb_programs; i++) { + if ((programs + i)->id == id) { + n = i; + break; + } + } + } + + /* unnecesary code */ + //if (n == -1) { + // VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id)); + // return; + //} + //if ((programs + n)->string) { + // free ((programs + n)->string); + //} + + (programs + n)->string = strdup (string); +} + +void del (int id) +{ + int i, j, n = -1; + + if (programs) { + + /* look for program */ + for (i = 0; i < nb_programs; i++) { + if ((programs + i)->id == id) { + n = i; + break; + } + } + } + if (n == -1) { + VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id)); + return; + } + + /* clean program */ + if ((programs + n)->storage) { + free ((programs + n)->storage); + } + if ((programs + n)->root) { + delelement ((programs + n)->root); + } + if ((programs + n)->string) { + free ((programs + n)->string); + } + + /* remove entry */ + workspace_t *tmp = (workspace_t *) callocordie (nb_programs - 1, sizeof (workspace_t)); + for (i = 0, j = 0; i < nb_programs; i++) { + if (i != n) { + memcpy (tmp + j, programs + i, sizeof (workspace_t)); + j++; + } + } + free (programs); + programs = tmp; + nb_programs--; +} + +/* help message */ + +void help (void) +{ + fprintf (stdout, "calc is a simple calculator\n\n"); + fprintf (stdout, "supported operators:"); + fprintf (stdout, " + - * / %% ^\n"); + fprintf (stdout, "camparison operators:"); + fprintf (stdout, " == != >= <= > <\n"); + fprintf (stdout, "logical operators:"); + fprintf (stdout, " & | !\n"); + fprintf (stdout, "mathematic functions:"); + fprintf (stdout, " pow sqrt log exp\n"); + fprintf (stdout, "trig. func.:"); + fprintf (stdout, " cos sin tan acos asin atan\n"); + fprintf (stdout, "supported functions:"); + fprintf (stdout, " abs ceil floor\n"); + fprintf (stdout, "storage functions:"); + fprintf (stdout, " mem sto rcl inc dec disp\n"); + fprintf (stdout, "prog. functions:"); + fprintf (stdout, " cond while print {} ;\n"); + fprintf (stdout, "misc. functions:"); + fprintf (stdout, " quit help\n"); + fprintf (stdout, "supported constants:"); + fprintf (stdout, " e pi\n"); +} + +/* evaluate element tree */ + +#define MASK_SUB 0x1 +#define MASK_DIV 0x2 + +double evaluate_element (element_t *root, char mask) +{ + double op0 = 0, op1 = 0; + char nextmask = mask; + int i, nb; + + if ((root == NULL) || (root == ERROR_OP)) { + VERBOSE (WARNING, fprintf (stdout, "error while evaluating\n")); + return 0; + } + + /* mask to manage sub operator sub and div */ + switch (root->func) { + case Add: + nextmask &= ~MASK_SUB; + nextmask &= ~MASK_DIV; + break; + case Sub: + nextmask |= MASK_SUB; + nextmask &= ~MASK_DIV; + break; + case Mul: + nextmask &= ~MASK_DIV; + break; + case Div: + nextmask |= MASK_DIV; + break; + default: + nextmask = mask; + } + + switch (root->func) { + case Val: + case Sig: + op0 = (root->ops[0]) ? evaluate_element (root->ops[0], nextmask) : root->value; + break; + case Add: + case Sub: + case Mul: + case Div: + case Mod: + case Pow: + case Store: + case Equal: + case Diff: + case Ge: + case Le: + case Gt: + case Lt: + case And: + case Or: + case Prog: + if (root->ops[1]) { + op1 = evaluate_element (root->ops[1], nextmask); + } else if (root->func != Store) { + VERBOSE (WARNING, fprintf (stdout, "error while evaluating (op[1])\n")); + return 0; + } + /* fallthrough */ + case Sqr: + case Cos: + case Sin: + case Tan: + case Acos: + case Asin: + case Atan: + case Log: + case Exp: + case Abs: + case Ceil: + case Floor: + case Recall: + case Inc: + case Dec: + case Not: + case Mem: + case Cond: + case Call: + case Edit: + case Del: + if (root->ops[0]) { + op0 = evaluate_element (root->ops[0], 0); + } else { + VERBOSE (WARNING, fprintf (stdout, "error while evaluating (op[0])\n")); + return 0; + } + break; + case Disp: + case Clear: + case Quit: + case Help: + case Ans: + case Pi: + case E: + case Code: + case List: + break; + case While: + if (root->ops[0] == NULL) { + VERBOSE (WARNING, fprintf (stdout, "error while evaluating (op[0])\n")); + return 0; + } + break; + case Print: + op0 = (root->ops[0]) ? evaluate_element (root->ops[0], 0) : answer; + break; + } + + switch (root->func) { + case Val: return op0; + case Sig: return -op0; + case Add: return ((mask & MASK_SUB) == 0) ? op0 + op1 : op0 - op1; + case Sub: return ((mask & MASK_SUB) == 0) ? op0 - op1 : op0 + op1; + case Mul: return ((mask & MASK_DIV) == 0) ? op0 * op1 : op0 / op1; + case Div: return ((mask & MASK_DIV) == 0) ? op0 / op1 : op0 * op1; + case Mod: return fmod (op0, op1); + case Pow: return pow (op0, op1); + case Sqr: return sqrt (op0); + case Cos: return cos (op0); + case Sin: return sin (op0); + case Tan: return tan (op0); + case Acos: return acos (op0); + case Asin: return asin (op0); + case Atan: return atan (op0); + case Log: return log (op0); + case Exp: return exp (op0); + case Abs: return fabs (op0); + case Ceil: return ceil (op0); + case Floor: return floor (op0); + case Store: return store ((int)op0, (op1) ? op1 : answer); + case Recall: return recall ((int)op0); + case Inc: return increase ((int)op0); + case Dec: return decrease ((int)op0); + case Disp: display (); break; + case Mem: memory ((int)op0); break; + case Clear: clear (); break; + case Quit: quit (); break; + case Help: help (); break; + case Ans: return answer; + case Pi: return M_PI; + case E: return M_E; + case Equal: return op0 == op1; + case Diff: return op0 != op1; + case Ge: return op0 >= op1; + case Le: return op0 <= op1; + case Gt: return op0 > op1; + case Lt: return op0 < op1; + case And: return (op0 != 0) && (op1 != 0); + case Or: return (op0 != 0) || (op1 != 0); + case Not: return (op0 == 0); + case Cond: + if ((op0) && (root->ops[1])) { + return evaluate_element (root->ops[1], 0); + } else if ((!op0) && (root->ops[2])) { + return evaluate_element (root->ops[2], 0); + } else { + return 0; + } + case While: return while_do (root->ops[0], root->ops[1]); + case Code: return execute_code (root->ops, root->nbops); + case Print: return print (op0); + case Prog: + prog ((int)op0, (int)op1, root->ops[2]); + savestring ((int)op0, root->string); + break; + case Call: + for (i = 1, nb =0; i < root->nbops; i++) { + if (root->ops[i]) { + nb++; + } + } + return call ((int)op0, nb, root->ops + 1); + case List: list (); break; + case Edit: edit ((int)op0); break; + case Del: del ((int)op0); break; + } + + return 0; +} + +char **generate_completion_list () +{ + int i, j, l = 0; + char **list = (char **) callocordie (NB_OPERATORS + NB_FUNCTIONS + NB_CONSTANTS + NB_SYMBOLS + 1, sizeof (char *)); + + for (i = 0; i < NB_OPERATORS; i++) { + list[l] = strdup ((operators + i)->keyword); + for (j = 0; j < (int)strlen (list[l]); j++) { + if (list[i][j] == '\t') { + list[i][j] = '\0'; + } + } + if (list[l] != NULL) { + l++; + } + } + + for (i = 0; i < NB_FUNCTIONS; i++) { + list[l] = strdup ((functions + i)->keyword); + if (list[l] != NULL) { + l++; + } + } + + for (i = 0; i < NB_CONSTANTS; i++) { + list[l] = strdup ((constants + i)->keyword); + if (list[l] != NULL) { + l++; + } + } + + for (i = 0; i < NB_SYMBOLS; i++) { + list[l] = strdup (symbols[i]); + if (list[l] != NULL) { + l++; + } + } + + return (list); +} + +void free_completion_list (char **list) +{ + int i; + + if (list) { + for (i = 0; i < NB_OPERATORS + NB_FUNCTIONS + NB_CONSTANTS + NB_SYMBOLS + 1; i++) { + if (list[i] != NULL) { + free (list[i]); + } + } + free (list); + } +} + + /* vim: set ts=4 sw=4 et: */