648 lines
15 KiB
C
648 lines
15 KiB
C
/*
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* Copyright (c) 2009-2011 Petri Lehtinen <petri@digip.org>
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* Copyright (c) 2011 Graeme Smecher <graeme.smecher@mail.mcgill.ca>
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*
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* Jansson is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <string.h>
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#include <jansson.h>
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#include "jansson_private.h"
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#include "utf.h"
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typedef struct {
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const char *start;
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const char *fmt;
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char token;
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json_error_t *error;
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size_t flags;
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int line;
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int column;
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} scanner_t;
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static const char *type_names[] = {
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"object",
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"array",
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"string",
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"integer",
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"real",
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"true",
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"false",
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"null"
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};
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#define type_name(x) type_names[json_typeof(x)]
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static const char *unpack_value_starters = "{[siIbfFOon";
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static void scanner_init(scanner_t *s, json_error_t *error,
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size_t flags, const char *fmt)
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{
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s->error = error;
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s->flags = flags;
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s->fmt = s->start = fmt;
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s->line = 1;
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s->column = 0;
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}
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static void next_token(scanner_t *s)
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{
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const char *t = s->fmt;
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s->column++;
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/* skip space and ignored chars */
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while(*t == ' ' || *t == '\t' || *t == '\n' || *t == ',' || *t == ':') {
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if(*t == '\n') {
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s->line++;
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s->column = 1;
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}
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else
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s->column++;
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t++;
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}
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s->token = *t;
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t++;
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s->fmt = t;
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}
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static void set_error(scanner_t *s, const char *source, const char *fmt, ...)
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{
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va_list ap;
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size_t pos;
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va_start(ap, fmt);
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pos = (size_t)(s->fmt - s->start);
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jsonp_error_vset(s->error, s->line, s->column, pos, fmt, ap);
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jsonp_error_set_source(s->error, source);
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va_end(ap);
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}
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static json_t *pack(scanner_t *s, va_list *ap);
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static json_t *pack_object(scanner_t *s, va_list *ap)
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{
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json_t *object = json_object();
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next_token(s);
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while(s->token != '}') {
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const char *key;
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json_t *value;
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if(!s->token) {
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set_error(s, "<format>", "Unexpected end of format string");
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goto error;
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}
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if(s->token != 's') {
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set_error(s, "<format>", "Expected format 's', got '%c'", s->token);
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goto error;
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}
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key = va_arg(*ap, const char *);
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if(!key) {
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set_error(s, "<args>", "NULL object key");
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goto error;
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}
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if(!utf8_check_string(key, -1)) {
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set_error(s, "<args>", "Invalid UTF-8 in object key");
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goto error;
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}
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next_token(s);
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value = pack(s, ap);
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if(!value)
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goto error;
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if(json_object_set_new_nocheck(object, key, value)) {
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set_error(s, "<internal>", "Unable to add key \"%s\"", key);
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goto error;
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}
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next_token(s);
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}
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return object;
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error:
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json_decref(object);
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return NULL;
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}
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static json_t *pack_array(scanner_t *s, va_list *ap)
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{
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json_t *array = json_array();
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next_token(s);
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while(s->token != ']') {
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json_t *value;
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if(!s->token) {
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set_error(s, "<format>", "Unexpected end of format string");
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goto error;
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}
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value = pack(s, ap);
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if(!value)
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goto error;
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if(json_array_append_new(array, value)) {
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set_error(s, "<internal>", "Unable to append to array");
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goto error;
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}
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next_token(s);
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}
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return array;
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error:
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json_decref(array);
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return NULL;
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}
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static json_t *pack(scanner_t *s, va_list *ap)
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{
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switch(s->token) {
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case '{':
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return pack_object(s, ap);
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case '[':
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return pack_array(s, ap);
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case 's': /* string */
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{
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const char *str = va_arg(*ap, const char *);
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if(!str) {
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set_error(s, "<args>", "NULL string argument");
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return NULL;
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}
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if(!utf8_check_string(str, -1)) {
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set_error(s, "<args>", "Invalid UTF-8 string");
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return NULL;
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}
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return json_string_nocheck(str);
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}
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case 'n': /* null */
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return json_null();
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case 'b': /* boolean */
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return va_arg(*ap, int) ? json_true() : json_false();
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case 'i': /* integer from int */
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return json_integer(va_arg(*ap, int));
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case 'I': /* integer from json_int_t */
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return json_integer(va_arg(*ap, json_int_t));
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case 'f': /* real */
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return json_real(va_arg(*ap, double));
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case 'O': /* a json_t object; increments refcount */
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return json_incref(va_arg(*ap, json_t *));
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case 'o': /* a json_t object; doesn't increment refcount */
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return va_arg(*ap, json_t *);
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default:
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set_error(s, "<format>", "Unexpected format character '%c'",
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s->token);
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return NULL;
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}
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}
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static int unpack(scanner_t *s, json_t *root, va_list *ap);
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static int unpack_object(scanner_t *s, json_t *root, va_list *ap)
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{
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int ret = -1;
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int strict = 0;
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/* Use a set (emulated by a hashtable) to check that all object
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keys are accessed. Checking that the correct number of keys
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were accessed is not enough, as the same key can be unpacked
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multiple times.
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*/
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hashtable_t key_set;
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if(hashtable_init(&key_set)) {
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set_error(s, "<internal>", "Out of memory");
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return -1;
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}
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if(root && !json_is_object(root)) {
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set_error(s, "<validation>", "Expected object, got %s",
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type_name(root));
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goto out;
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}
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next_token(s);
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while(s->token != '}') {
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const char *key;
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json_t *value;
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int opt = 0;
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if(strict != 0) {
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set_error(s, "<format>", "Expected '}' after '%c', got '%c'",
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(strict == 1 ? '!' : '*'), s->token);
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goto out;
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}
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if(!s->token) {
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set_error(s, "<format>", "Unexpected end of format string");
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goto out;
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}
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if(s->token == '!' || s->token == '*') {
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strict = (s->token == '!' ? 1 : -1);
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next_token(s);
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continue;
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}
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if(s->token != 's') {
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set_error(s, "<format>", "Expected format 's', got '%c'", s->token);
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goto out;
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}
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key = va_arg(*ap, const char *);
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if(!key) {
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set_error(s, "<args>", "NULL object key");
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goto out;
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}
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next_token(s);
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if(s->token == '?') {
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opt = 1;
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next_token(s);
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}
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if(!root) {
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/* skipping */
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value = NULL;
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}
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else {
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value = json_object_get(root, key);
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if(!value && !opt) {
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set_error(s, "<validation>", "Object item not found: %s", key);
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goto out;
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}
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}
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if(unpack(s, value, ap))
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goto out;
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hashtable_set(&key_set, key, 0, json_null());
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next_token(s);
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}
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if(strict == 0 && (s->flags & JSON_STRICT))
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strict = 1;
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if(root && strict == 1 && key_set.size != json_object_size(root)) {
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long diff = (long)json_object_size(root) - (long)key_set.size;
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set_error(s, "<validation>", "%li object item(s) left unpacked", diff);
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goto out;
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}
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ret = 0;
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out:
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hashtable_close(&key_set);
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return ret;
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}
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static int unpack_array(scanner_t *s, json_t *root, va_list *ap)
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{
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size_t i = 0;
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int strict = 0;
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if(root && !json_is_array(root)) {
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set_error(s, "<validation>", "Expected array, got %s", type_name(root));
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return -1;
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}
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next_token(s);
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while(s->token != ']') {
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json_t *value;
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if(strict != 0) {
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set_error(s, "<format>", "Expected ']' after '%c', got '%c'",
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(strict == 1 ? '!' : '*'),
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s->token);
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return -1;
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}
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if(!s->token) {
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set_error(s, "<format>", "Unexpected end of format string");
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return -1;
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}
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if(s->token == '!' || s->token == '*') {
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strict = (s->token == '!' ? 1 : -1);
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next_token(s);
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continue;
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}
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if(!strchr(unpack_value_starters, s->token)) {
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set_error(s, "<format>", "Unexpected format character '%c'",
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s->token);
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return -1;
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}
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if(!root) {
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/* skipping */
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value = NULL;
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}
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else {
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value = json_array_get(root, i);
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if(!value) {
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set_error(s, "<validation>", "Array index %lu out of range",
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(unsigned long)i);
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return -1;
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}
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}
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if(unpack(s, value, ap))
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return -1;
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next_token(s);
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i++;
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}
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if(strict == 0 && (s->flags & JSON_STRICT))
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strict = 1;
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if(root && strict == 1 && i != json_array_size(root)) {
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long diff = (long)json_array_size(root) - (long)i;
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set_error(s, "<validation>", "%li array item(s) left unpacked", diff);
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return -1;
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}
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return 0;
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}
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static int unpack(scanner_t *s, json_t *root, va_list *ap)
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{
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switch(s->token)
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{
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case '{':
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return unpack_object(s, root, ap);
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case '[':
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return unpack_array(s, root, ap);
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case 's':
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if(root && !json_is_string(root)) {
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set_error(s, "<validation>", "Expected string, got %s",
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type_name(root));
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return -1;
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}
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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const char **target;
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target = va_arg(*ap, const char **);
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if(!target) {
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set_error(s, "<args>", "NULL string argument");
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return -1;
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}
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if(root)
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*target = json_string_value(root);
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}
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return 0;
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case 'i':
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if(root && !json_is_integer(root)) {
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set_error(s, "<validation>", "Expected integer, got %s",
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type_name(root));
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return -1;
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}
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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int *target = va_arg(*ap, int*);
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if(root)
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*target = json_integer_value(root);
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}
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return 0;
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case 'I':
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if(root && !json_is_integer(root)) {
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set_error(s, "<validation>", "Expected integer, got %s",
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type_name(root));
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return -1;
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}
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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json_int_t *target = va_arg(*ap, json_int_t*);
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if(root)
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*target = json_integer_value(root);
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}
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return 0;
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case 'b':
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if(root && !json_is_boolean(root)) {
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set_error(s, "<validation>", "Expected true or false, got %s",
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type_name(root));
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return -1;
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}
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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int *target = va_arg(*ap, int*);
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if(root)
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*target = json_is_true(root);
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}
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return 0;
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case 'f':
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if(root && !json_is_real(root)) {
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set_error(s, "<validation>", "Expected real, got %s",
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type_name(root));
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return -1;
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}
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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double *target = va_arg(*ap, double*);
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if(root)
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*target = json_real_value(root);
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}
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return 0;
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case 'F':
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if(root && !json_is_number(root)) {
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set_error(s, "<validation>", "Expected real or integer, got %s",
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type_name(root));
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return -1;
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}
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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double *target = va_arg(*ap, double*);
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if(root)
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*target = json_number_value(root);
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}
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return 0;
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case 'O':
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if(root && !(s->flags & JSON_VALIDATE_ONLY))
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json_incref(root);
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/* Fall through */
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case 'o':
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if(!(s->flags & JSON_VALIDATE_ONLY)) {
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json_t **target = va_arg(*ap, json_t**);
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if(root)
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*target = root;
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}
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return 0;
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case 'n':
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/* Never assign, just validate */
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if(root && !json_is_null(root)) {
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set_error(s, "<validation>", "Expected null, got %s",
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type_name(root));
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return -1;
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}
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return 0;
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default:
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set_error(s, "<format>", "Unexpected format character '%c'",
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s->token);
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return -1;
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}
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}
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json_t *json_vpack_ex(json_error_t *error, size_t flags,
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const char *fmt, va_list ap)
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{
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scanner_t s;
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va_list ap_copy;
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json_t *value;
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if(!fmt || !*fmt) {
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jsonp_error_init(error, "<format>");
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jsonp_error_set(error, -1, -1, 0, "NULL or empty format string");
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return NULL;
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}
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jsonp_error_init(error, NULL);
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scanner_init(&s, error, flags, fmt);
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next_token(&s);
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va_copy(ap_copy, ap);
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value = pack(&s, &ap_copy);
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va_end(ap_copy);
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if(!value)
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return NULL;
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next_token(&s);
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if(s.token) {
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json_decref(value);
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set_error(&s, "<format>", "Garbage after format string");
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return NULL;
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}
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return value;
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}
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json_t *json_pack_ex(json_error_t *error, size_t flags, const char *fmt, ...)
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{
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json_t *value;
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va_list ap;
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va_start(ap, fmt);
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value = json_vpack_ex(error, flags, fmt, ap);
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va_end(ap);
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return value;
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}
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json_t *json_pack(const char *fmt, ...)
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{
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json_t *value;
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va_list ap;
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va_start(ap, fmt);
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value = json_vpack_ex(NULL, 0, fmt, ap);
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va_end(ap);
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return value;
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}
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int json_vunpack_ex(json_t *root, json_error_t *error, size_t flags,
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const char *fmt, va_list ap)
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{
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scanner_t s;
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va_list ap_copy;
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|
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if(!root) {
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jsonp_error_init(error, "<root>");
|
|
jsonp_error_set(error, -1, -1, 0, "NULL root value");
|
|
return -1;
|
|
}
|
|
|
|
if(!fmt || !*fmt) {
|
|
jsonp_error_init(error, "<format>");
|
|
jsonp_error_set(error, -1, -1, 0, "NULL or empty format string");
|
|
return -1;
|
|
}
|
|
jsonp_error_init(error, NULL);
|
|
|
|
scanner_init(&s, error, flags, fmt);
|
|
next_token(&s);
|
|
|
|
va_copy(ap_copy, ap);
|
|
if(unpack(&s, root, &ap_copy)) {
|
|
va_end(ap_copy);
|
|
return -1;
|
|
}
|
|
va_end(ap_copy);
|
|
|
|
next_token(&s);
|
|
if(s.token) {
|
|
set_error(&s, "<format>", "Garbage after format string");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int json_unpack_ex(json_t *root, json_error_t *error, size_t flags, const char *fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
ret = json_vunpack_ex(root, error, flags, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int json_unpack(json_t *root, const char *fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
ret = json_vunpack_ex(root, NULL, 0, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|