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add json parsing of lists and maps

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This commit is contained in:
Felix Van der Jeugt 2022-11-08 23:31:00 +01:00
parent 7471093f67
commit 025c8125fa
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GPG key ID: 58B209295023754D
16 changed files with 210 additions and 20 deletions
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135
json.c
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@ -67,6 +67,7 @@ Json * parse_number(FILE *stream, int sign) {
break;
default:
if (c != EOF) ungetc(c, stream);
if (den == 0) den = 1;
json = malloc(sizeof(Json));
json->type = NUMBER;
json->value.number = sign * num * 1.0 / den;
@ -104,15 +105,109 @@ Json * parse_string(FILE *stream) {
buffer[i++] = c;
}
}
free(buffer);
return NULL;
}
Json * parse_list(FILE *stream) { return NULL; /* TODO */ }
Json * parse_map(FILE *stream) { return NULL; /* TODO */ }
Json * parse_list(FILE *stream) {
char c;
Json * json;
ArrayList * values = list();
int expect_comma = 0;
while ((c = getc(stream)) != EOF) {
switch (c) {
case ']':
json = malloc(sizeof(Json));
json->type = LIST;
json->value.list = values;
return json;
case ' ':
case '\n':
case '\t':
break;
case ',':
if (expect_comma) {
expect_comma = 0;
break;
}
default:
ungetc(c, stream);
json = json_parse(stream);
add_list(values, (void *) json);
expect_comma = 1;
}
}
fold_list(values, NULL, free_listitem);
free_list(values);
return NULL;
}
enum map_state { MKEY, MCOLON, MVALUE, MCOMMA };
Json * parse_map(FILE *stream) {
char c;
Json * json = NULL;
char * key = NULL;
SortedMap * values = map();
enum map_state s = MKEY;
while ((c = getc(stream)) != EOF) {
switch (s) {
case MKEY:
switch (c) {
case ' ': case '\n': case '\t': break;
case '}':
json = malloc(sizeof(Json));
json->type = MAP;
json->value.map = values;
return json;
case '"':
json = parse_string(stream);
key = json->value.string;
free(json);
json = NULL;
s = MCOLON;
}
break;
case MCOLON:
switch (c) {
case ' ': case '\n': case '\t': break;
case ':':
s = MVALUE;
}
break;
case MVALUE:
switch (c) {
case ' ': case '\n': case '\t': break;
default:
ungetc(c, stream);
json = json_parse(stream);
values = put_map(values, key, (void *) json);
json = NULL;
s = MCOMMA;
}
break;
case MCOMMA:
switch (c) {
case ' ': case '\n': case '\t': break;
case ',':
s = MKEY;
break;
case '}':
json = malloc(sizeof(Json));
json->type = MAP;
json->value.map = values;
return json;
}
break;
}
}
fold_map(values, NULL, free_mappair);
free_map(values);
return NULL;
}
Json * json_parse(FILE *stream) {
char c;
Json * json = NULL;
while ((c = getc(stream)) != EOF) {
switch (c) {
case '{':
@ -149,7 +244,11 @@ Json * json_parse(FILE *stream) {
fprintf(stderr, "encountered char: '%c'", c);
}
}
return json;
return NULL;
}
void print_string(FILE *stream, char *string) {
fprintf(stream, "\"%s\"", string);
}
struct printacc {
@ -159,7 +258,12 @@ struct printacc {
void * json_print_map(void * voidacc, char *key, void *value) {
struct printacc *acc = (struct printacc *) voidacc;
if (acc->index++ > 0) {
fprintf(acc->stream, ", ");
}
print_string(acc->stream, key);
fprintf(acc->stream, ": ");
json_print((Json *) value, acc->stream);
return acc;
}
@ -174,7 +278,7 @@ void json_print(Json *this, FILE *stream) {
fprintf(stream, this->value.boolean == 0 ? "false" : "true");
break;
case STRING:
fprintf(stream, "\"%s\"", this->value.string);
print_string(stream, this->value.string);
break;
case NUMBER:
fprintf(stream, "%f", this->value.number);
@ -193,12 +297,23 @@ void json_print(Json *this, FILE *stream) {
case MAP:
fprintf(stream, "{");
acc.stream = stream;
fold_map((void *) &acc, this->value.map, json_print_map);
fold_map(this->value.map, (void *) &acc, json_print_map);
fprintf(stream, "}");
break;
}
}
void * json_freelist(void *acc, int index, void *item) {
json_free((Json *) item);
return NULL;
}
void * json_freemap(void *acc, char *key, void *value) {
free(key);
json_free((Json *) value);
return NULL;
}
void json_free(Json *this) {
switch (this->type) {
case NIL:
@ -209,10 +324,12 @@ void json_free(Json *this) {
free(this->value.string);
break;
case LIST:
/* TODO */
fold_list(this->value.list, NULL, json_freelist);
free_list(this->value.list);
break;
case MAP:
/* TODO */
fold_map(this->value.map, NULL, json_freemap);
free_map(this->value.map);
break;
}
free(this);