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Slightly better debug output

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This commit is contained in:
Eric Fischer 2014-02-05 17:21:19 -08:00
parent 3e9bb4567e
commit 558c47c498
1 changed files with 51 additions and 24 deletions
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75
json.c
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@ -1,6 +1,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
typedef enum json_type {
JSON_STRING, JSON_NUMBER, JSON_ARRAY, JSON_HASH, JSON_NULL, JSON_TRUE, JSON_FALSE,
@ -27,6 +28,8 @@ typedef struct json_object {
json_hash *hash;
} json_object;
void json_print(json_object *j);
static json_object *add_object(json_type type, json_object *parent) {
json_object *o = malloc(sizeof(struct json_object));
o->type = type;
@ -57,8 +60,11 @@ static json_object *add_object(json_type type, json_object *parent) {
return o;
}
static void json_error(char *s) {
fprintf(stderr, "%s\n", s);
static void json_error(char *s, ...) {
va_list ap;
va_start(ap, s);
vfprintf(stderr, s, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
@ -112,7 +118,7 @@ json_object *json_parse(FILE *f, json_object *current) {
return json_parse(f, add_object(JSON_ARRAY, current));
} else if (c == ']') {
if (current->parent == NULL || current->parent->type != JSON_ARRAY) {
json_error("] without [");
json_error("] without [\n");
}
return current->parent;
@ -122,7 +128,7 @@ json_object *json_parse(FILE *f, json_object *current) {
return json_parse(f, add_object(JSON_HASH, current));
} else if (c == '}') {
if (current->parent == NULL || current->parent->type != JSON_HASH) {
json_error("} without {");
json_error("} without {\n");
}
return current->parent;
@ -130,7 +136,7 @@ json_object *json_parse(FILE *f, json_object *current) {
if (c == 'n') {
if (getc(f) != 'u' || getc(f) != 'l' || getc(f) != 'l') {
json_error("misspelled null");
json_error("misspelled null\n");
}
return add_object(JSON_NULL, current);
@ -138,7 +144,7 @@ json_object *json_parse(FILE *f, json_object *current) {
if (c == 't') {
if (getc(f) != 'r' || getc(f) != 'u' || getc(f) != 'e') {
json_error("misspelled true");
json_error("misspelled true\n");
}
return add_object(JSON_TRUE, current);
@ -146,7 +152,7 @@ json_object *json_parse(FILE *f, json_object *current) {
if (c == 'f') {
if (getc(f) != 'a' || getc(f) != 'l' || getc(f) != 's' || getc(f) != 'e') {
json_error("misspelled false");
json_error("misspelled false\n");
}
return add_object(JSON_FALSE, current);
@ -154,23 +160,23 @@ json_object *json_parse(FILE *f, json_object *current) {
if (c == ',') {
if (current->parent == NULL ||
(current->parent->type != JSON_ARRAY ||
(current->parent->type != JSON_ARRAY &&
current->parent->type != JSON_HASH)) {
json_error(", not in array or hash");
json_error(", not in array or hash: %d\n", current->parent->type);
}
return json_parse(f, current);
return json_parse(f, current->parent);
}
if (c == ':') {
if (current->parent == NULL || current->parent->type != JSON_HASH) {
json_error(": not in hash");
json_error(": not in hash: %d\n", current->parent);
}
if (current->parent->hash == NULL || current->parent->hash->value != NULL) {
json_error(": without key");
json_error(": without key: %d\n", current->parent);
}
return json_parse(f, current);
return json_parse(f, current->parent);
}
if (c == '-' || (c >= '0' && c <= '9')) {
@ -250,7 +256,7 @@ json_object *json_parse(FILE *f, json_object *current) {
} else if (c == 'u') {
/* XXX */
} else {
json_error("unknown string escape");
json_error("unknown string escape %c\n", c);
}
} else {
string_append(&val, c);
@ -263,26 +269,45 @@ json_object *json_parse(FILE *f, json_object *current) {
return s;
}
json_error("unrecognized character");
json_error("unrecognized character %c\n", c);
}
void json_print(json_object *j) {
if (j->type == JSON_STRING) {
printf("string: %s\n", j->string);
if (j == NULL) {
printf("NULL");
} else if (j->type == JSON_STRING) {
printf("\"%s\"", j->string);
} else if (j->type == JSON_NUMBER) {
printf("number: %f\n", j->number);
printf("%f", j->number);
} else if (j->type == JSON_NULL) {
printf("null\n");
printf("null");
} else if (j->type == JSON_TRUE) {
printf("true\n");
printf("true");
} else if (j->type == JSON_FALSE) {
printf("false\n");
printf("false");
} else if (j->type == JSON_HASH) {
printf("hash\n");
printf("{");
json_hash *h = j->hash;
while (h != NULL) {
json_print(h->key);
printf(":");
json_print(h->value);
printf(",");
h = h->next;
}
printf("}");
} else if (j->type == JSON_ARRAY) {
printf("array\n");
printf("[");
json_array *a = j->array;
while (a != NULL) {
json_print(a->object);
printf(",");
a = a->next;
}
printf("]");
} else {
printf("what type? %d\n", j->type);
printf("what type? %d", j->type);
}
}
@ -290,10 +315,12 @@ int main() {
json_object *j = NULL;
while ((j = json_parse(stdin, j)) != NULL) {
#if 0
if (j->parent != NULL) {
printf("parent: ");
json_print(j->parent);
}
#endif
json_print(j);
printf("\n");
}