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#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "cudl.h"
#define STRIP_WHITESPACE(text) while (isspace(*text)) text++
int cudl_err = CUDL_OK;
static char *fread_all(FILE *file) {
size_t size;
char *buffer;
fseek(file, 0, SEEK_END);
size = ftell(file);
rewind(file);
clearerr(file);
if ((buffer = malloc(size + 1)) == NULL)
return NULL;
if (fread(buffer, 1, size, file) != size) {
free(buffer);
return NULL;
}
buffer[size] = '\0';
return buffer;
}
void cudl_debug(struct cudl_value value) {
int i;
switch (value.tag) {
case CUDL_TAG_NULL:
printf("%%null");
break;
case CUDL_TAG_BOOL:
if (value.data.boolean)
printf("%%true");
else
printf("%%false");
break;
case CUDL_TAG_ARRAY:
printf("[");
for (i = 0; i < value.data.array.length; i++)
cudl_debug(value.data.array.values[i]);
printf("]");
break;
default:
printf("UNKNOWN");
break;
}
}
/* Free all children of the value, not the value itself */
void cudl_deinit_value(struct cudl_value value) {
int i;
switch (value.tag) {
case CUDL_TAG_ARRAY:
for (i = 0; i < value.data.array.length; i++) {
cudl_deinit_value(value.data.array.values[i]);
}
free(value.data.array.values);
break;
case CUDL_TAG_NULL:
default:
break;
}
}
/* Parse a value from input and store it in value.
* Return the number of bytes consumed.
* Input must end with a null byte */
static size_t parse_value(char *input, struct cudl_value *value);
static size_t parse_bool_or_null(char *input, struct cudl_value *value) {
if (strncmp(input, "null", 4) == 0) {
value->tag = CUDL_TAG_NULL;
return 4;
}
if (strncmp(input, "true", 4) == 0) {
value->tag = CUDL_TAG_BOOL;
value->data.boolean = 1;
return 4;
}
if (strncmp(input, "false", 5) == 0) {
value->tag = CUDL_TAG_BOOL;
value->data.boolean = 0;
return 5;
}
cudl_err = CUDL_ERR_EXPECTED_BOOL_OR_NULL;
return 0;
}
static size_t parse_array(char *input, struct cudl_value *value) {
size_t length, capacity;
struct cudl_value *values, *newvalues;
int i;
char *original_input;
original_input = input;
value->tag = CUDL_TAG_ARRAY;
length = 0;
capacity = 8;
if ((values = malloc(capacity * sizeof(struct cudl_value))) == NULL) {
cudl_err = CUDL_ERR_OUT_OF_MEMORY;
return 0;
}
STRIP_WHITESPACE(input);
for (;;) {
if (*input == '\0') {
cudl_err = CUDL_ERR_UNMATCHED_BRACK;
for (i = 0; i < length; i++)
cudl_deinit_value(values[i]);
free(values);
return 0;
} else if (*input == ']') {
input++;
values = realloc(values, length * sizeof(struct cudl_value));
value->data.array.length = length;
value->data.array.values = values;
return input - original_input;
}
if (length >= capacity) {
if ((newvalues = realloc(values, 2 * capacity * sizeof(struct cudl_value))) == NULL) {
cudl_err = CUDL_ERR_OUT_OF_MEMORY;
for (i = 0; i < length; i++)
cudl_deinit_value(values[i]);
free(values);
return 0;
}
capacity *= 2;
}
input += parse_value(input, values + length);
if (cudl_err) {
for (i = 0; i < length; i++) {
cudl_deinit_value(values[i]);
}
free(values);
return 0;
}
length++;
}
}
static size_t _parse_value(char *input, struct cudl_value *value) {
if (*input == '%')
return parse_bool_or_null(++input, value) + 1;
if (*input == '[')
return parse_array(++input, value) + 1;
cudl_err = CUDL_ERR_UNRECOGNISED_VALUE;
return 0;
}
static size_t parse_value(char *input, struct cudl_value *value) {
char *original_input;
original_input = input;
input += _parse_value(input, value);
STRIP_WHITESPACE(input);
return input - original_input;
}
void cudl_parse_from_file(FILE *file, struct cudl_value *value) {
char *input, *original_input;
if ((original_input = input = fread_all(file)) == NULL) {
if (ferror(file))
cudl_err = CUDL_ERR_READING;
else
cudl_err = CUDL_ERR_OUT_OF_MEMORY;
return;
}
input += cudl_parse(input, value);
if (*input != '\0')
cudl_deinit_value(*value);
free(original_input);
}
size_t cudl_parse(char *input, struct cudl_value *value) {
STRIP_WHITESPACE(input);
return parse_value(input, value);
}
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