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#include "syntax.h"
#include <string.h>
#include "mem.h"
void free_token(struct token *tk) {
if (tk->kind == TOKEN_INT)
return;
if (tk->var)
my_free(tk->var);
}
void free_token_list(struct token_list *list) {
unsigned int i;
for (i = 0; i < list->index; i++)
free_token(&list->elems[i]);
my_free(list);
}
bool empty_args_list(struct arg_list *list) {
return !list;
}
unsigned char len_arg_list(struct arg_list *list) {
unsigned char i = 0;
while (list) {
i++;
list = list->rest;
}
return i;
}
void cpy_expression(struct expression *dst, struct expression *src) {
free_expression(dst);
dst->kind = src->kind;
switch (dst->kind) {
case EXPR_INT:
dst->var1 = src->var1;
break;
case EXPR_NAME:
dst->var1 = my_calloc(1, strlen((char*) src->var1) + 1);
strcpy(dst->var1, src->var1);
break;
case EXPR_CODE:
dst->var1 = src->var1;
dst->var2 = my_calloc(1, sizeof(unsigned char));
*((unsigned char*) dst->var2) = *((unsigned char*) src->var2);
break;
case EXPR_LIST:
if (!src->var1)
break;
case EXPR_TUPLE:
case EXPR_APP:
dst->var1 = my_calloc(1, sizeof(struct expression));
dst->var2 = my_calloc(1, sizeof(struct expression));
cpy_expression(dst->var1, src->var1);
cpy_expression(dst->var2, src->var2);
break;
}
}
bool eq_expression(struct expression *a, struct expression *b) {
if (a->kind != b->kind)
return 0;
switch (a->kind) {
case EXPR_INT: return a->var1 == b->var1;
case EXPR_NAME: return !strcmp(a->var1, b->var1);
case EXPR_CODE: return a->var1 == b->var1;
case EXPR_TUPLE:
case EXPR_LIST:
case EXPR_APP:
if ((!a->var1 && b->var1) || (a->var1 && !b->var1) ||
(!a->var2 && b->var2) || (a->var2 && b->var2))
return 0;
if (a->var1 && !eq_expression(a->var1, b->var1))
return 0;
if (a->var2 && !eq_expression(a->var2, b->var2))
return 0;
return 1;
}
return 0;
}
void concat_fuspel(struct fuspel *start, struct fuspel *end) {
while (start) {
if (!start->rest) {
start->rest = end;
return;
}
start = start->rest;
}
}
struct fuspel *push_fuspel(struct fuspel *rules) {
struct fuspel *new_rules = my_calloc(1, sizeof(struct fuspel));
new_rules->rest = rules;
return new_rules;
}
struct fuspel *pop_fuspel(struct fuspel *rules) {
free_rewrite_rule(&rules->rule);
return rules->rest;
}
struct fuspel *popn_fuspel(struct fuspel *rules, unsigned char n) {
while (n > 0) {
rules = pop_fuspel(rules);
n--;
}
return rules;
}
void free_expression(struct expression *expr) {
if (!expr)
return;
switch (expr->kind) {
case EXPR_INT:
break;
case EXPR_NAME:
my_free(expr->var1);
break;
case EXPR_CODE:
my_free(expr->var2);
break;
case EXPR_LIST:
case EXPR_TUPLE:
case EXPR_APP:
free_expression(expr->var1);
free_expression(expr->var2);
my_free(expr->var1);
my_free(expr->var2);
break;
}
expr->var1 = expr->var2 = NULL;
}
void free_arg_list(struct arg_list *list) {
free_expression(&list->elem);
if (list->rest)
free_arg_list(list->rest);
my_free(list->rest);
}
void free_rewrite_rule(struct rewrite_rule *rule) {
my_free(rule->name);
if (rule->args)
free_arg_list(rule->args);
my_free(rule->args);
free_expression(&rule->rhs);
}
void free_fuspel(struct fuspel *rules) {
free_rewrite_rule(&rules->rule);
if (rules->rest)
free_fuspel(rules->rest);
my_free(rules->rest);
}
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