-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include "symbol_table.h"
-
-struct symbol *new_tab(void)
-{
- return SYMNULL;
-}
-
-struct symbol *clone_tab(struct symbol *tab)
-{
- struct symbol *elm;
- struct symbol *new_tabx;
-
- elm = tab;
- new_tabx = new_tab();
- while(elm != SYMNULL) {
- new_tabx = tab_add_symbol(new_tabx, elm->ident, elm->type, 0);
- elm = elm->next;
- }
-
- return new_tabx;
-}
-
-struct symbol *tab_add_symbol(struct symbol *tab, char *ident, short type, short check)
-{
- struct symbol *elm;
- struct symbol *new_elm;
-
- if(tab_lookup(tab,ident) != SYMNULL) {
- if(check) {
- fprintf(stderr, "Feld doppelt vorhanden: \"%s\"\n", ident);
- exit(3);
- }
- tab = tab_remove_symbol(tab, ident);
- }
-
- new_elm = (struct symbol *) malloc(sizeof(struct symbol));
- new_elm->next = SYMNULL;
- new_elm->ident = strdup(ident);
- new_elm->type = type;
-
- if(tab == SYMNULL) {
- return new_elm;
- }
-
- elm = tab;
- while(elm->next != SYMNULL) {
- elm = elm->next;
- }
- elm->next = new_elm;
-
- return tab;
-}
-
-struct symbol *tab_lookup(struct symbol *tab, char *ident)
-{
- struct symbol *elm = tab;
-
- if(tab == SYMNULL) {
- return SYMNULL;
- }
-
- if(strcmp(elm->ident, ident) == 0) {
- return elm;
- }
-
- while(elm->next != SYMNULL) {
- elm = elm->next;
- if(strcmp(elm->ident, ident) == 0) {
- return elm;
- }
- }
-
- return SYMNULL;
-}
-
-struct symbol *tab_merge(struct symbol *tab, struct symbol *to_add, short check)
-{
- struct symbol *elm = to_add;
- struct symbol *new_tab = clone_tab(tab);
-
- while(elm != SYMNULL) {
- new_tab = tab_add_symbol(new_tab, elm->ident, elm->type, check);
- elm = elm->next;
- }
-
- return new_tab;
-}
-
-struct symbol *tab_remove_symbol(struct symbol *tab, char *ident)
-{
- struct symbol *elm = tab;
- struct symbol *previous_elm = SYMNULL;
- struct symbol *new_elm;
-
- if(tab == SYMNULL) {
- return SYMNULL;
- }
-
- while(elm != SYMNULL) {
- if(strcmp(elm->ident, ident) == 0) {
- if(previous_elm == SYMNULL) {
- new_elm = elm->next;
- } else {
- previous_elm->next = elm->next;
- new_elm = tab;
- }
- (void)free(elm->ident);
- (void)free(elm);
- return new_elm;
- }
- previous_elm = elm;
- elm = elm->next;
- }
-
- return tab;
-}
-
-void check_variable(struct symbol *tab, char *ident)
-{
- struct symbol *elm = tab_lookup(tab, ident);
- if(elm != SYMNULL) {
- if(elm->type != S_VAR) {
- fprintf(stderr, "Identifier ist keine Variable: \"%s\"\n", ident);
- exit(3);
- }
- } else {
- fprintf(stderr, "Unbekannter Identifier: \"%s\"\n", ident);
- exit(3);
- }
-}
-
-void check_field(struct symbol *tab, char *ident)
-{
- struct symbol *elm = tab_lookup(tab, ident);
- if(elm != SYMNULL) {
- if(elm->type != S_FIELD) {
- fprintf(stderr, "Identifier ist kein Feld: \"%s\"\n", ident);
- exit(3);
- }
- } else {
- fprintf(stderr, "Unbekannter Identifier: \"%s\"\n", ident);
- exit(3);
- }
-}
-