Initial commit. Demo program is included in the jsmn.c code. Ugly names and no comments. Please, don't read this changeset
Serge A. Zaitsev
14 years ago
commit
f22c2d30b7
@ -0,0 +1,13 @@
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CFLAGS=-Wall -W -std=c89
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all: jsmn_demo
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jsmn_demo: jsmn.o
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gcc $(LDFLAGS) jsmn.o -o $@
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jsmn.o: jsmn.c jsmn.h
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gcc $(CFLAGS) -c jsmn.c -o $@
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clean:
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rm -f jsmn.o
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rm -f jsmn_demo
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@ -0,0 +1,198 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include "jsmn.h"
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enum {
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JSON_SKIP = 0,
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JSON_OPEN = 1,
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JSON_CLOSE = 2,
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JSON_BARE = 3,
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JSON_UNBARE = 4,
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JSON_QUOTE = 5,
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JSON_UNQUOTE = 6,
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JSON_ERROR = 7
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};
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#define JSON_SYM_SKIP(sym) \
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[sym] = JSON_SKIP
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#define JSON_SYM_ERROR(sym) \
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[sym] = JSON_ERROR
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#define JSON_SYM_OPEN(sym) \
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[sym] = JSON_OPEN
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#define JSON_SYM_CLOSE(sym) \
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[sym] = JSON_CLOSE
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#define JSON_SYM_BARE(sym) \
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[sym] = JSON_BARE
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#define JSON_SYM_UNBARE(sym) \
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[sym] = JSON_UNBARE
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#define JSON_SYM_QUOTE(sym) \
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[sym] = JSON_QUOTE
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#define JSON_SYM_UNQUOTE(sym) \
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[sym] = JSON_UNQUOTE
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int jsmn_parse(const unsigned char *js, jsontok_t *tokens, size_t num_tokens, int **errpos) {
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int jsmn_token_start(jsontype_t type, int pos) {
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unsigned int i;
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for (i = 0; i<num_tokens; i++) {
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if (tokens[i].start == -1 && tokens[i].end == -1) {
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tokens[i].start = pos;
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tokens[i].type = type;
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return 0;
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}
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}
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return -1;
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}
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int jsmn_token_end(jsontype_t type, int pos) {
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unsigned int i;
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for (i = num_tokens - 1; i>= 0; i--) {
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if (tokens[i].type == type && tokens[i].start != -1 && tokens[i].end == -1) {
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tokens[i].end = pos;
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return 0;
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}
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}
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return -1;
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}
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const unsigned char *p;
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jsontok_t *cur_token;
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int obj_common[] = {
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JSON_SYM_ERROR(0 ... 255),
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JSON_SYM_SKIP('\t'), JSON_SYM_SKIP('\r'),JSON_SYM_SKIP('\n'),
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JSON_SYM_SKIP(':'), JSON_SYM_SKIP(','), JSON_SYM_SKIP(' '),
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JSON_SYM_QUOTE('\"'),
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JSON_SYM_OPEN('['), JSON_SYM_CLOSE(']'),
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JSON_SYM_OPEN('{'), JSON_SYM_CLOSE('}'),
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JSON_SYM_BARE('-'), JSON_SYM_BARE('0'...'9'),
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JSON_SYM_BARE('t'), JSON_SYM_BARE('f'), JSON_SYM_BARE('n') /* true false null */
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};
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int obj_bare[] = {
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JSON_SYM_ERROR(0 ... 31),
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JSON_SYM_ERROR(127 ... 255),
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JSON_SYM_SKIP(32 ... 126),
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JSON_SYM_UNBARE('\t'), JSON_SYM_UNBARE(' '),
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JSON_SYM_UNBARE('\r'), JSON_SYM_UNBARE('\n'),
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JSON_SYM_UNBARE(','), JSON_SYM_UNBARE(']'),
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JSON_SYM_UNBARE('}')
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};
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int obj_string[] = {
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JSON_SYM_ERROR(0 ... 31), JSON_SYM_ERROR(127),
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JSON_SYM_SKIP(32 ... 126),
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JSON_SYM_UNQUOTE('\"'),
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JSON_SYM_ERROR(248 ... 255),
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};
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int *obj_state = obj_common;
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cur_token = tokens;
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int i;
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for (i = 0; i<num_tokens; i++) {
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tokens[i].start = tokens[i].end = -1;
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tokens[i].type = JSON_OTHER;
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}
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for (p = js; *p != '\0'; ) {
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switch (obj_state[*p]) {
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case JSON_ERROR:
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if (errpos != NULL) {
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*errpos = p;
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}
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return -1;
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case JSON_OPEN:
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jsmn_token_start(JSON_OBJECT, p - js);
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break;
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case JSON_CLOSE:
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jsmn_token_end(JSON_OBJECT, p - js + 1);
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break;
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case JSON_BARE:
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jsmn_token_start(JSON_OTHER, p - js);
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obj_state = obj_bare;
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break;
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case JSON_UNBARE:
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jsmn_token_end(JSON_OTHER, p - js);
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obj_state = obj_common;
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continue;
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case JSON_QUOTE:
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jsmn_token_start(JSON_STRING, p - js + 1);
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obj_state = obj_string;
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break;
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case JSON_UNQUOTE:
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jsmn_token_end(JSON_STRING, p - js);
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obj_state = obj_common;
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break;
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case JSON_SKIP:
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break;
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}
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p++;
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}
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return 0;
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}
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void json_dump_obj(jsontok_t *obj, const char *js) {
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int len;
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printf("[%d,%d]", obj->start, obj->end);
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len = obj->end - obj->start;
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char *type;
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switch (obj->type) {
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case JSON_OTHER:
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type = "other";
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break;
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case JSON_STRING:
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type = "string";
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break;
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case JSON_ARRAY:
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type = "array";
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break;
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case JSON_OBJECT:
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type = "object";
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break;
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}
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printf(" %s ", type);
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if (len > 0) {
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char *s = strndup(&js[obj->start], len);
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printf("%s", s);
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free(s);
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}
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printf("\n");
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}
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int main(int argc, char *argv[]) {
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int i;
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#define NUM_TOKENS 20
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jsontok_t tokens[NUM_TOKENS];
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const char *js =
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"{"
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"\"foo\": \"bar\","
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"\"bar\": [1,2, 3],"
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"\"obj\": { \"true\": false}"
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"}";
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jsmn_parse(js, tokens, NUM_TOKENS, NULL);
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for (i = 0; i<NUM_TOKENS; i++) {
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json_dump_obj(&tokens[i], js);
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}
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return 0;
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}
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