/*
- * Copyright (c) 2009, 2010 Petri Lehtinen <petri@digip.org>
+ * Copyright (c) 2009-2011 Petri Lehtinen <petri@digip.org>
*
* Jansson is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#define _GNU_SOURCE
-#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <stdarg.h>
#include <assert.h>
#include <jansson.h>
#include "strbuffer.h"
#include "utf.h"
+#define STREAM_STATE_OK 0
+#define STREAM_STATE_EOF -1
+#define STREAM_STATE_ERROR -2
+
#define TOKEN_INVALID -1
#define TOKEN_EOF 0
#define TOKEN_STRING 256
#define TOKEN_FALSE 260
#define TOKEN_NULL 261
-/* read one byte from stream, return EOF on end of file */
+/* Locale independent versions of isxxx() functions */
+#define l_isupper(c) ('A' <= c && c <= 'Z')
+#define l_islower(c) ('a' <= c && c <= 'z')
+#define l_isalpha(c) (l_isupper(c) || l_islower(c))
+#define l_isdigit(c) ('0' <= c && c <= '9')
+#define l_isxdigit(c) \
+ (l_isdigit(c) || 'A' <= c || c <= 'F' || 'a' <= c || c <= 'f')
+
+/* Read one byte from stream, convert to unsigned char, then int, and
+ return. return EOF on end of file. This corresponds to the
+ behaviour of fgetc(). */
typedef int (*get_func)(void *data);
-/* return non-zero if end of file has been reached */
-typedef int (*eof_func)(void *data);
-
typedef struct {
get_func get;
- eof_func eof;
void *data;
- int stream_pos;
char buffer[5];
int buffer_pos;
+ int state;
+ int line;
+ int column, last_column;
+ size_t position;
} stream_t;
-
typedef struct {
stream_t stream;
strbuffer_t saved_text;
int token;
- int line, column;
union {
char *string;
json_int_t integer;
} value;
} lex_t;
+#define stream_to_lex(stream) container_of(stream, lex_t, stream)
-/*** error reporting ***/
-static void error_init(json_error_t *error)
-{
- if(error)
- {
- error->text[0] = '\0';
- error->line = -1;
- }
-}
+/*** error reporting ***/
static void error_set(json_error_t *error, const lex_t *lex,
const char *msg, ...)
{
va_list ap;
- char text[JSON_ERROR_TEXT_LENGTH];
+ char msg_text[JSON_ERROR_TEXT_LENGTH];
+ char msg_with_context[JSON_ERROR_TEXT_LENGTH];
+
+ int line = -1, col = -1;
+ size_t pos = 0;
+ const char *result = msg_text;
- if(!error || error->text[0] != '\0') {
- /* error already set */
+ if(!error)
return;
- }
va_start(ap, msg);
- vsnprintf(text, JSON_ERROR_TEXT_LENGTH, msg, ap);
+ vsnprintf(msg_text, JSON_ERROR_TEXT_LENGTH, msg, ap);
va_end(ap);
if(lex)
{
const char *saved_text = strbuffer_value(&lex->saved_text);
- error->line = lex->line;
+
+ line = lex->stream.line;
+ col = lex->stream.column;
+ pos = lex->stream.position;
+
if(saved_text && saved_text[0])
{
if(lex->saved_text.length <= 20) {
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
- "%s near '%s'", text, saved_text);
+ snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
+ "%s near '%s'", msg_text, saved_text);
+ result = msg_with_context;
}
- else
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
}
else
{
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
- "%s near end of file", text);
+ if(lex->stream.state == STREAM_STATE_ERROR) {
+ /* No context for UTF-8 decoding errors */
+ result = msg_text;
+ }
+ else {
+ snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
+ "%s near end of file", msg_text);
+ result = msg_with_context;
+ }
}
}
- else
- {
- error->line = -1;
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
- }
+
+ jsonp_error_set(error, line, col, pos, "%s", result);
}
/*** lexical analyzer ***/
static void
-stream_init(stream_t *stream, get_func get, eof_func eof, void *data)
+stream_init(stream_t *stream, get_func get, void *data)
{
stream->get = get;
- stream->eof = eof;
stream->data = data;
- stream->stream_pos = 0;
stream->buffer[0] = '\0';
stream->buffer_pos = 0;
+
+ stream->state = STREAM_STATE_OK;
+ stream->line = 1;
+ stream->column = 0;
+ stream->position = 0;
}
-static char stream_get(stream_t *stream, json_error_t *error)
+static int stream_get(stream_t *stream, json_error_t *error)
{
- char c;
+ int c;
+
+ if(stream->state != STREAM_STATE_OK)
+ return stream->state;
if(!stream->buffer[stream->buffer_pos])
{
- stream->buffer[0] = stream->get(stream->data);
- stream->buffer_pos = 0;
+ c = stream->get(stream->data);
+ if(c == EOF) {
+ stream->state = STREAM_STATE_EOF;
+ return STREAM_STATE_EOF;
+ }
- c = stream->buffer[0];
+ stream->buffer[0] = c;
+ stream->buffer_pos = 0;
- if((unsigned char)c >= 0x80 && c != (char)EOF)
+ if(0x80 <= c && c <= 0xFF)
{
/* multi-byte UTF-8 sequence */
int i, count;
if(!utf8_check_full(stream->buffer, count, NULL))
goto out;
- stream->stream_pos += count;
stream->buffer[count] = '\0';
}
- else {
+ else
stream->buffer[1] = '\0';
- stream->stream_pos++;
- }
}
- return stream->buffer[stream->buffer_pos++];
+ c = stream->buffer[stream->buffer_pos++];
-out:
- error_set(error, NULL, "unable to decode byte 0x%x at position %d",
- (unsigned char)c, stream->stream_pos);
+ stream->position++;
+ if(c == '\n') {
+ stream->line++;
+ stream->last_column = stream->column;
+ stream->column = 0;
+ }
+ else if(utf8_check_first(c)) {
+ /* track the Unicode character column, so increment only if
+ this is the first character of a UTF-8 sequence */
+ stream->column++;
+ }
- stream->buffer[0] = EOF;
- stream->buffer[1] = '\0';
- stream->buffer_pos = 1;
+ return c;
- return EOF;
+out:
+ stream->state = STREAM_STATE_ERROR;
+ error_set(error, stream_to_lex(stream), "unable to decode byte 0x%x", c);
+ return STREAM_STATE_ERROR;
}
-static void stream_unget(stream_t *stream, char c)
+static void stream_unget(stream_t *stream, int c)
{
+ if(c == STREAM_STATE_EOF || c == STREAM_STATE_ERROR)
+ return;
+
+ stream->position--;
+ if(c == '\n') {
+ stream->line--;
+ stream->column = stream->last_column;
+ }
+ else if(utf8_check_first(c))
+ stream->column--;
+
assert(stream->buffer_pos > 0);
stream->buffer_pos--;
assert(stream->buffer[stream->buffer_pos] == c);
return stream_get(&lex->stream, error);
}
-static int lex_eof(lex_t *lex)
-{
- return lex->stream.eof(lex->stream.data);
-}
-
-static void lex_save(lex_t *lex, char c)
+static void lex_save(lex_t *lex, int c)
{
strbuffer_append_byte(&lex->saved_text, c);
}
static int lex_get_save(lex_t *lex, json_error_t *error)
{
- char c = stream_get(&lex->stream, error);
- lex_save(lex, c);
+ int c = stream_get(&lex->stream, error);
+ if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR)
+ lex_save(lex, c);
return c;
}
-static void lex_unget_unsave(lex_t *lex, char c)
+static void lex_unget(lex_t *lex, int c)
{
- char d;
stream_unget(&lex->stream, c);
- d = strbuffer_pop(&lex->saved_text);
- assert(c == d);
+}
+
+static void lex_unget_unsave(lex_t *lex, int c)
+{
+ if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR) {
+ char d;
+ stream_unget(&lex->stream, c);
+ d = strbuffer_pop(&lex->saved_text);
+ assert(c == d);
+ }
}
static void lex_save_cached(lex_t *lex)
{
lex_save(lex, lex->stream.buffer[lex->stream.buffer_pos]);
lex->stream.buffer_pos++;
+ lex->stream.position++;
}
}
for(i = 1; i <= 4; i++) {
char c = str[i];
value <<= 4;
- if(isdigit(c))
+ if(l_isdigit(c))
value += c - '0';
- else if(islower(c))
+ else if(l_islower(c))
value += c - 'a' + 10;
- else if(isupper(c))
+ else if(l_isupper(c))
value += c - 'A' + 10;
else
assert(0);
static void lex_scan_string(lex_t *lex, json_error_t *error)
{
- char c;
+ int c;
const char *p;
char *t;
int i;
c = lex_get_save(lex, error);
while(c != '"') {
- if(c == (char)EOF) {
- lex_unget_unsave(lex, c);
- if(lex_eof(lex))
- error_set(error, lex, "premature end of input");
+ if(c == STREAM_STATE_ERROR)
+ goto out;
+
+ else if(c == STREAM_STATE_EOF) {
+ error_set(error, lex, "premature end of input");
goto out;
}
- else if((unsigned char)c <= 0x1F) {
+ else if(0 <= c && c <= 0x1F) {
/* control character */
lex_unget_unsave(lex, c);
if(c == '\n')
if(c == 'u') {
c = lex_get_save(lex, error);
for(i = 0; i < 4; i++) {
- if(!isxdigit(c)) {
- lex_unget_unsave(lex, c);
+ if(!l_isxdigit(c)) {
error_set(error, lex, "invalid escape");
goto out;
}
c == 'f' || c == 'n' || c == 'r' || c == 't')
c = lex_get_save(lex, error);
else {
- lex_unget_unsave(lex, c);
error_set(error, lex, "invalid escape");
goto out;
}
- two \uXXXX escapes (length 12) forming an UTF-16 surrogate pair
are converted to 4 bytes
*/
- lex->value.string = malloc(lex->saved_text.length + 1);
+ lex->value.string = jsonp_malloc(lex->saved_text.length + 1);
if(!lex->value.string) {
/* this is not very nice, since TOKEN_INVALID is returned */
goto out;
return;
out:
- free(lex->value.string);
+ jsonp_free(lex->value.string);
}
-#ifdef JSON_INTEGER_IS_LONG_LONG
+#if JSON_INTEGER_IS_LONG_LONG
#define json_strtoint strtoll
#else
#define json_strtoint strtol
#endif
-static int lex_scan_number(lex_t *lex, char c, json_error_t *error)
+static int lex_scan_number(lex_t *lex, int c, json_error_t *error)
{
const char *saved_text;
char *end;
if(c == '0') {
c = lex_get_save(lex, error);
- if(isdigit(c)) {
+ if(l_isdigit(c)) {
lex_unget_unsave(lex, c);
goto out;
}
}
- else if(isdigit(c)) {
+ else if(l_isdigit(c)) {
c = lex_get_save(lex, error);
- while(isdigit(c))
+ while(l_isdigit(c))
c = lex_get_save(lex, error);
}
else {
- lex_unget_unsave(lex, c);
- goto out;
+ lex_unget_unsave(lex, c);
+ goto out;
}
if(c != '.' && c != 'E' && c != 'e') {
if(c == '.') {
c = lex_get(lex, error);
- if(!isdigit(c))
+ if(!l_isdigit(c)) {
+ lex_unget(lex, c);
goto out;
+ }
lex_save(lex, c);
c = lex_get_save(lex, error);
- while(isdigit(c))
+ while(l_isdigit(c))
c = lex_get_save(lex, error);
}
if(c == '+' || c == '-')
c = lex_get_save(lex, error);
- if(!isdigit(c)) {
+ if(!l_isdigit(c)) {
lex_unget_unsave(lex, c);
goto out;
}
c = lex_get_save(lex, error);
- while(isdigit(c))
+ while(l_isdigit(c))
c = lex_get_save(lex, error);
}
lex_unget_unsave(lex, c);
- saved_text = strbuffer_value(&lex->saved_text);
- value = strtod(saved_text, &end);
- assert(end == saved_text + lex->saved_text.length);
-
- if(errno == ERANGE && value != 0) {
+ if(jsonp_strtod(&lex->saved_text, &value)) {
error_set(error, lex, "real number overflow");
goto out;
}
static int lex_scan(lex_t *lex, json_error_t *error)
{
- char c;
+ int c;
strbuffer_clear(&lex->saved_text);
if(lex->token == TOKEN_STRING) {
- free(lex->value.string);
+ jsonp_free(lex->value.string);
lex->value.string = NULL;
}
c = lex_get(lex, error);
while(c == ' ' || c == '\t' || c == '\n' || c == '\r')
- {
- if(c == '\n')
- lex->line++;
-
c = lex_get(lex, error);
+
+ if(c == STREAM_STATE_EOF) {
+ lex->token = TOKEN_EOF;
+ goto out;
}
- if(c == (char)EOF) {
- if(lex_eof(lex))
- lex->token = TOKEN_EOF;
- else
- lex->token = TOKEN_INVALID;
+ if(c == STREAM_STATE_ERROR) {
+ lex->token = TOKEN_INVALID;
goto out;
}
else if(c == '"')
lex_scan_string(lex, error);
- else if(isdigit(c) || c == '-') {
+ else if(l_isdigit(c) || c == '-') {
if(lex_scan_number(lex, c, error))
goto out;
}
- else if(isupper(c) || islower(c)) {
+ else if(l_isalpha(c)) {
/* eat up the whole identifier for clearer error messages */
const char *saved_text;
c = lex_get_save(lex, error);
- while(isupper(c) || islower(c))
+ while(l_isalpha(c))
c = lex_get_save(lex, error);
lex_unget_unsave(lex, c);
return result;
}
-static int lex_init(lex_t *lex, get_func get, eof_func eof, void *data)
+static int lex_init(lex_t *lex, get_func get, void *data)
{
- stream_init(&lex->stream, get, eof, data);
+ stream_init(&lex->stream, get, data);
if(strbuffer_init(&lex->saved_text))
return -1;
lex->token = TOKEN_INVALID;
- lex->line = 1;
-
return 0;
}
static void lex_close(lex_t *lex)
{
if(lex->token == TOKEN_STRING)
- free(lex->value.string);
+ jsonp_free(lex->value.string);
strbuffer_close(&lex->saved_text);
}
/*** parser ***/
-static json_t *parse_value(lex_t *lex, json_error_t *error);
+static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error);
-static json_t *parse_object(lex_t *lex, json_error_t *error)
+static json_t *parse_object(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *object = json_object();
if(!object)
if(!key)
return NULL;
+ if(flags & JSON_REJECT_DUPLICATES) {
+ if(json_object_get(object, key)) {
+ jsonp_free(key);
+ error_set(error, lex, "duplicate object key");
+ goto error;
+ }
+ }
+
lex_scan(lex, error);
if(lex->token != ':') {
- free(key);
+ jsonp_free(key);
error_set(error, lex, "':' expected");
goto error;
}
lex_scan(lex, error);
- value = parse_value(lex, error);
+ value = parse_value(lex, flags, error);
if(!value) {
- free(key);
+ jsonp_free(key);
goto error;
}
if(json_object_set_nocheck(object, key, value)) {
- free(key);
+ jsonp_free(key);
json_decref(value);
goto error;
}
json_decref(value);
- free(key);
+ jsonp_free(key);
lex_scan(lex, error);
if(lex->token != ',')
return NULL;
}
-static json_t *parse_array(lex_t *lex, json_error_t *error)
+static json_t *parse_array(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *array = json_array();
if(!array)
return array;
while(lex->token) {
- json_t *elem = parse_value(lex, error);
+ json_t *elem = parse_value(lex, flags, error);
if(!elem)
goto error;
return NULL;
}
-static json_t *parse_value(lex_t *lex, json_error_t *error)
+static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *json;
break;
case '{':
- json = parse_object(lex, error);
+ json = parse_object(lex, flags, error);
break;
case '[':
- json = parse_array(lex, error);
+ json = parse_array(lex, flags, error);
break;
case TOKEN_INVALID:
return json;
}
-static json_t *parse_json(lex_t *lex, json_error_t *error)
+static json_t *parse_json(lex_t *lex, size_t flags, json_error_t *error)
{
- error_init(error);
+ json_t *result;
lex_scan(lex, error);
- if(lex->token != '[' && lex->token != '{') {
- error_set(error, lex, "'[' or '{' expected");
+ if(!(flags & JSON_DECODE_ANY)) {
+ if(lex->token != '[' && lex->token != '{') {
+ error_set(error, lex, "'[' or '{' expected");
+ return NULL;
+ }
+ }
+
+ result = parse_value(lex, flags, error);
+ if(!result)
return NULL;
+
+ if(!(flags & JSON_DISABLE_EOF_CHECK)) {
+ lex_scan(lex, error);
+ if(lex->token != TOKEN_EOF) {
+ error_set(error, lex, "end of file expected");
+ json_decref(result);
+ result = NULL;
+ }
}
- return parse_value(lex, error);
+ return result;
}
typedef struct
else
{
stream->pos++;
- return c;
+ return (unsigned char)c;
}
}
-static int string_eof(void *data)
+json_t *json_loads(const char *string, size_t flags, json_error_t *error)
{
- string_data_t *stream = (string_data_t *)data;
- return (stream->data[stream->pos] == '\0');
+ lex_t lex;
+ json_t *result;
+ string_data_t stream_data;
+
+ jsonp_error_init(error, "<string>");
+
+ if (string == NULL) {
+ error_set(error, NULL, "wrong arguments");
+ return NULL;
+ }
+
+ stream_data.data = string;
+ stream_data.pos = 0;
+
+ if(lex_init(&lex, string_get, (void *)&stream_data))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
+ lex_close(&lex);
+ return result;
}
-json_t *json_loads(const char *string, size_t flags, json_error_t *error)
+typedef struct
+{
+ const char *data;
+ size_t len;
+ size_t pos;
+} buffer_data_t;
+
+static int buffer_get(void *data)
+{
+ char c;
+ buffer_data_t *stream = data;
+ if(stream->pos >= stream->len)
+ return EOF;
+
+ c = stream->data[stream->pos];
+ stream->pos++;
+ return (unsigned char)c;
+}
+
+json_t *json_loadb(const char *buffer, size_t buflen, size_t flags, json_error_t *error)
{
lex_t lex;
json_t *result;
- (void)flags; /* unused */
+ buffer_data_t stream_data;
- string_data_t stream_data = {
- .data = string,
- .pos = 0
- };
+ jsonp_error_init(error, "<buffer>");
- if(lex_init(&lex, string_get, string_eof, (void *)&stream_data))
+ if (buffer == NULL) {
+ error_set(error, NULL, "wrong arguments");
return NULL;
+ }
- result = parse_json(&lex, error);
- if(!result)
- goto out;
+ stream_data.data = buffer;
+ stream_data.pos = 0;
+ stream_data.len = buflen;
- lex_scan(&lex, error);
- if(lex.token != TOKEN_EOF) {
- error_set(error, &lex, "end of file expected");
- json_decref(result);
- result = NULL;
- }
+ if(lex_init(&lex, buffer_get, (void *)&stream_data))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
-out:
lex_close(&lex);
return result;
}
json_t *json_loadf(FILE *input, size_t flags, json_error_t *error)
{
lex_t lex;
+ const char *source;
json_t *result;
- (void)flags; /* unused */
- if(lex_init(&lex, (get_func)fgetc, (eof_func)feof, input))
- return NULL;
+ if(input == stdin)
+ source = "<stdin>";
+ else
+ source = "<stream>";
- result = parse_json(&lex, error);
- if(!result)
- goto out;
+ jsonp_error_init(error, source);
- lex_scan(&lex, error);
- if(lex.token != TOKEN_EOF) {
- error_set(error, &lex, "end of file expected");
- json_decref(result);
- result = NULL;
+ if (input == NULL) {
+ error_set(error, NULL, "wrong arguments");
+ return NULL;
}
-out:
+ if(lex_init(&lex, (get_func)fgetc, input))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
lex_close(&lex);
return result;
}
json_t *result;
FILE *fp;
- error_init(error);
+ jsonp_error_init(error, path);
+
+ if (path == NULL) {
+ error_set(error, NULL, "wrong arguments");
+ return NULL;
+ }
- fp = fopen(path, "r");
+ fp = fopen(path, "rb");
if(!fp)
{
error_set(error, NULL, "unable to open %s: %s",