Expose interface for arbitrary reader functions

This commit is contained in:
Eric Fischer 2014-02-07 16:22:47 -08:00
parent 4a14e09457
commit a7e26262ea
2 changed files with 35 additions and 37 deletions

View File

@ -5,21 +5,23 @@
#include <stdarg.h>
#include "jsonpull.h"
static json_pull *json_init() {
json_pull *json_begin(int (*read)(struct json_pull *), int (*peek)(struct json_pull *), void *source) {
json_pull *j = malloc(sizeof(json_pull));
j->error = NULL;
j->line = 1;
j->root = NULL;
j->container = NULL;
j->read = read;
j->peek = peek;
j->source = source;
return j;
}
static int read_file(json_pull *j) {
int c = fgetc(j->source);
if (c == '\n') {
j->line++;
}
return c;
return fgetc(j->source);
}
static int peek_file(json_pull *j) {
@ -29,13 +31,7 @@ static int peek_file(json_pull *j) {
}
json_pull *json_begin_file(FILE *f) {
json_pull *j = json_init();
j->read = read_file;
j->peek = peek_file;
j->source = f;
return j;
return json_begin(read_file, peek_file, f);
}
static int read_string(json_pull *j) {
@ -44,11 +40,7 @@ static int read_string(json_pull *j) {
return EOF;
}
int c = (unsigned char) *cp;
cp++;
j->source = cp;
if (c == '\n') {
j->line++;
}
j->source = cp + 1;
return c;
}
@ -61,13 +53,17 @@ static int peek_string(json_pull *p) {
}
json_pull *json_begin_string(char *s) {
json_pull *j = json_init();
return json_begin(read_string, peek_string, s);
}
j->read = read_string;
j->peek = peek_string;
j->source = s;
static int read_wrap(json_pull *j) {
int c = j->read(j);
return j;
if (c == '\n') {
j->line++;
}
return c;
}
#define SIZE_FOR(i) (((i) + 31) & ~31)
@ -184,7 +180,7 @@ again:
/////////////////////////// Whitespace
do {
c = j->read(j);
c = read_wrap(j);
if (c == EOF) {
if (j->container != NULL) {
j->error = "Reached EOF without all containers being closed";
@ -273,7 +269,7 @@ again:
/////////////////////////// Null
if (c == 'n') {
if (j->read(j) != 'u' || j->read(j) != 'l' || j->read(j) != 'l') {
if (read_wrap(j) != 'u' || read_wrap(j) != 'l' || read_wrap(j) != 'l') {
j->error = "Found misspelling of null";
return NULL;
}
@ -284,7 +280,7 @@ again:
/////////////////////////// True
if (c == 't') {
if (j->read(j) != 'r' || j->read(j) != 'u' || j->read(j) != 'e') {
if (read_wrap(j) != 'r' || read_wrap(j) != 'u' || read_wrap(j) != 'e') {
j->error = "Found misspelling of true";
return NULL;
}
@ -295,7 +291,7 @@ again:
/////////////////////////// False
if (c == 'f') {
if (j->read(j) != 'a' || j->read(j) != 'l' || j->read(j) != 's' || j->read(j) != 'e') {
if (read_wrap(j) != 'a' || read_wrap(j) != 'l' || read_wrap(j) != 's' || read_wrap(j) != 'e') {
j->error = "Found misspelling of false";
return NULL;
}
@ -359,7 +355,7 @@ again:
if (c == '-') {
string_append(&val, c);
c = j->read(j);
c = read_wrap(j);
}
if (c == '0') {
@ -369,28 +365,28 @@ again:
c = j->peek(j);
while (c >= '0' && c <= '9') {
string_append(&val, j->read(j));
string_append(&val, read_wrap(j));
c = j->peek(j);
}
}
if (j->peek(j) == '.') {
string_append(&val, j->read(j));
string_append(&val, read_wrap(j));
c = j->peek(j);
while (c >= '0' && c <= '9') {
string_append(&val, j->read(j));
string_append(&val, read_wrap(j));
c = j->peek(j);
}
}
c = j->peek(j);
if (c == 'e' || c == 'E') {
string_append(&val, j->read(j));
string_append(&val, read_wrap(j));
c = j->peek(j);
if (c == '+' || c == '-') {
string_append(&val, j->read(j));
string_append(&val, read_wrap(j));
}
c = j->peek(j);
@ -399,7 +395,7 @@ again:
return NULL;
}
while (c >= '0' && c <= '9') {
string_append(&val, j->read(j));
string_append(&val, read_wrap(j));
c = j->peek(j);
}
}
@ -418,11 +414,11 @@ again:
struct string val;
string_init(&val);
while ((c = j->read(j)) != EOF) {
while ((c = read_wrap(j)) != EOF) {
if (c == '"') {
break;
} else if (c == '\\') {
c = j->read(j);
c = read_wrap(j);
if (c == '"') {
string_append(&val, '"');
@ -444,7 +440,7 @@ again:
char hex[5] = "aaaa";
int i;
for (i = 0; i < 4; i++) {
hex[i] = j->read(j);
hex[i] = read_wrap(j);
}
unsigned long ch = strtoul(hex, NULL, 16);
if (ch <= 0x7F) {

View File

@ -41,6 +41,8 @@ typedef void (*json_separator_callback)(json_type type, json_pull *j, void *stat
json_pull *json_begin_file(FILE *f);
json_pull *json_begin_string(char *s);
json_pull *json_begin(int (*read)(struct json_pull *), int (*peek)(struct json_pull *), void *source);
json_object *json_parse(json_pull *j);
json_object *json_parse_with_separators(json_pull *j, json_separator_callback cb, void *state);
void json_free(json_object *j);