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Copy pathsjson.c
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1283 lines (1001 loc) · 25.8 KB
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/**
* sjson - fast string based JSON parser/generator library
* Copyright (C) 2013 Ondřej Jirman <megous@megous.com>
*
* WWW: https://github.com/megous/sjson
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdio.h>
#include "sjson.h"
enum
{
TOK_NONE = 0, // no more tokens
TOK_OBJ_START,
TOK_OBJ_END,
TOK_ARRAY_START,
TOK_ARRAY_END,
TOK_COLON,
TOK_COMMA,
TOK_STRING,
TOK_NOESC_STRING,
TOK_NUMBER,
TOK_FALSE,
TOK_TRUE,
TOK_NULL,
TOK_INVALID
};
/*!re2c
re2c:define:YYCTYPE = "guchar";
re2c:define:YYCURSOR = c;
re2c:define:YYMARKER = m;
re2c:yyfill:enable = 0;
re2c:yych:conversion = 1;
re2c:indent:top = 1;
WS = [ \t\n\r]+;
INT = ("0" | [1-9] [0-9]*);
MINUS = "-";
FRAC = ("." [0-9]+);
EXP = [eE] [+-]? [0-9]+;
NUMBER = MINUS? INT FRAC? EXP?;
CHAR = [^\\"\000];
CTL = "\\" ["\\/bfnrt];
UNICODE = "\\u" [0-9a-fA-F]{4};
STRING = "\"" (CHAR|CTL|UNICODE)* "\"";
NOESC_STRING = "\"" (CHAR)* "\"";
IDENT = [A-Za-z_-][a-zA-Z0-9_-]*;
*/
static gint s_json_get_token(const gchar* json, const gchar** start, const gchar** end)
{
g_return_val_if_fail(json != NULL, FALSE);
const guchar* c = (const guchar*)json;
const guchar* m = NULL;
const guchar* s;
gint token;
while (TRUE)
{
s = c;
/*!re2c
WS {
continue;
}
"{" {
token = TOK_OBJ_START;
goto done;
}
"}" {
token = TOK_OBJ_END;
goto done;
}
"[" {
token = TOK_ARRAY_START;
goto done;
}
"]" {
token = TOK_ARRAY_END;
goto done;
}
NOESC_STRING {
token = TOK_NOESC_STRING;
goto done;
}
STRING {
token = TOK_STRING;
goto done;
}
":" {
token = TOK_COLON;
goto done;
}
"," {
token = TOK_COMMA;
goto done;
}
NUMBER {
token = TOK_NUMBER;
goto done;
}
"true" {
token = TOK_TRUE;
goto done;
}
"false" {
token = TOK_FALSE;
goto done;
}
"null" {
token = TOK_NULL;
goto done;
}
[\000] {
return TOK_NONE;
}
. | "\n" {
return TOK_INVALID;
}
*/
}
done:
if (start)
*start = s;
if (end)
*end = c;
return token;
}
static SJsonType token_to_type(gint token)
{
switch (token)
{
case TOK_NONE : return S_JSON_TYPE_NONE;
case TOK_OBJ_START : return S_JSON_TYPE_OBJECT;
case TOK_ARRAY_START : return S_JSON_TYPE_ARRAY;
case TOK_STRING : return S_JSON_TYPE_STRING;
case TOK_NOESC_STRING: return S_JSON_TYPE_STRING;
case TOK_NUMBER : return S_JSON_TYPE_NUMBER;
case TOK_FALSE : return S_JSON_TYPE_BOOL;
case TOK_TRUE : return S_JSON_TYPE_BOOL;
case TOK_NULL : return S_JSON_TYPE_NULL;
default : return S_JSON_TYPE_INVALID;
}
}
// public api
static gboolean s_json_is_valid_inner(const gchar* json, const gchar** end)
{
const gchar* next;
gint token;
g_return_val_if_fail(json != NULL, FALSE);
token = s_json_get_token(json, NULL, &next);
if (token == TOK_ARRAY_START)
{
const gchar* array_elem = next;
const gchar* array_next = NULL;
gboolean expect_comma = FALSE;
while (TRUE)
{
// check end of array
token = s_json_get_token(array_elem, NULL, &array_next);
if (token == TOK_ARRAY_END)
{
if (end)
*end = array_next;
return TRUE;
}
if (expect_comma)
{
if (token == TOK_COMMA)
array_elem = array_next; // skip comma
else
return FALSE;
}
// check element
if (!s_json_is_valid_inner(array_elem, &array_elem))
return FALSE;
expect_comma = TRUE;
}
}
else if (token == TOK_OBJ_START)
{
const gchar* obj_next = next;
gboolean expect_comma = FALSE;
while (TRUE)
{
// check end of object
token = s_json_get_token(obj_next, NULL, &obj_next);
if (token == TOK_OBJ_END)
{
if (end)
*end = obj_next;
return TRUE;
}
// eat comma
if (expect_comma)
{
if (token != TOK_COMMA)
return FALSE;
token = s_json_get_token(obj_next, NULL, &obj_next);
}
// check member name and colon
if (token != TOK_STRING && token != TOK_NOESC_STRING)
return FALSE;
token = s_json_get_token(obj_next, NULL, &obj_next);
if (token != TOK_COLON)
return FALSE;
// check member value
if (!s_json_is_valid_inner(obj_next, &obj_next))
return FALSE;
expect_comma = TRUE;
}
}
else if (token == TOK_STRING || token == TOK_NOESC_STRING || token == TOK_NUMBER || token == TOK_FALSE || token == TOK_TRUE || token == TOK_NULL)
{
if (end)
*end = next;
return TRUE;
}
return FALSE;
}
gboolean s_json_is_valid(const gchar* json)
{
const gchar* next;
g_return_val_if_fail(json != NULL, FALSE);
return s_json_is_valid_inner(json, &next) && s_json_get_token(next, NULL, NULL) == TOK_NONE;
}
gchar* s_json_get(const gchar* json)
{
const gchar* next;
const gchar* start = NULL;
g_return_val_if_fail(json != NULL, NULL);
if (s_json_is_valid_inner(json, &next))
{
s_json_get_token(json, &start, NULL); // must set start
return g_strndup(start, next - start);
}
return NULL;
}
SJsonType s_json_get_type(const gchar* json)
{
g_return_val_if_fail(json != NULL, S_JSON_TYPE_INVALID);
return token_to_type(s_json_get_token(json, NULL, NULL));
}
const gchar* s_json_get_element_first(const gchar* json)
{
const gchar* next_elem;
gint token;
g_return_val_if_fail(json != NULL, NULL);
token = s_json_get_token(json, NULL, &next_elem);
if (token != TOK_ARRAY_START)
return NULL;
if (s_json_get_token(next_elem, NULL, NULL) == TOK_ARRAY_END)
return NULL;
return next_elem;
}
const gchar* s_json_get_element_next(const gchar* iter)
{
const gchar* next_elem;
gint token;
g_return_val_if_fail(iter != NULL, NULL);
if (!s_json_is_valid_inner(iter, &next_elem))
return NULL;
token = s_json_get_token(next_elem, NULL, &next_elem);
if (token != TOK_COMMA)
return NULL;
return next_elem;
}
const gchar* s_json_get_element(const gchar* json, guint index)
{
guint current_index = 0;
g_return_val_if_fail(json != NULL, NULL);
S_JSON_FOREACH_ELEMENT(json, elem)
if (current_index == index)
return elem;
current_index++;
S_JSON_FOREACH_END()
return NULL;
}
gchar** s_json_get_elements(const gchar* json)
{
GPtrArray* arr;
g_return_val_if_fail(json != NULL, NULL);
arr = g_ptr_array_sized_new(64);
S_JSON_FOREACH_ELEMENT(json, elem)
g_ptr_array_add(arr, (gchar*)elem);
S_JSON_FOREACH_END()
g_ptr_array_add(arr, NULL);
return (gchar**)g_ptr_array_free(arr, FALSE);
}
const gchar* s_json_get_member_first(const gchar* json, const gchar** value)
{
const gchar* key;
const gchar* colon;
const gchar* val;
gint token;
g_return_val_if_fail(json != NULL, NULL);
g_return_val_if_fail(value != NULL, NULL);
if (s_json_get_token(json, NULL, &key) != TOK_OBJ_START)
return NULL;
token = s_json_get_token(key, NULL, &colon);
if (token != TOK_STRING && token != TOK_NOESC_STRING)
return NULL;
if (s_json_get_token(colon, NULL, &val) != TOK_COLON)
return NULL;
*value = val;
return key;
}
const gchar* s_json_get_member_next(const gchar** value)
{
const gchar* comma;
const gchar* key;
const gchar* colon;
const gchar* val;
gint token;
g_return_val_if_fail(value != NULL && *value != NULL, NULL);
if (!s_json_is_valid_inner(*value, &comma))
return NULL;
if (s_json_get_token(comma, NULL, &key) != TOK_COMMA)
return NULL;
token = s_json_get_token(key, NULL, &colon);
if (token != TOK_STRING && token != TOK_NOESC_STRING)
return NULL;
if (s_json_get_token(colon, NULL, &val) != TOK_COLON)
return NULL;
*value = val;
return key;
}
const gchar* s_json_get_member(const gchar* json, const gchar* name)
{
g_return_val_if_fail(json != NULL, NULL);
g_return_val_if_fail(name != NULL, NULL);
S_JSON_FOREACH_MEMBER(json, key, value)
if (s_json_string_match(key, name))
return value;
S_JSON_FOREACH_END()
return NULL;
}
gchar* s_json_get_string(const gchar* json)
{
const gchar* start;
const gchar* end;
gint token;
g_return_val_if_fail(json != NULL, NULL);
token = s_json_get_token(json, &start, &end);
if (token != TOK_STRING && token != TOK_NOESC_STRING)
return NULL;
if (token == TOK_NOESC_STRING)
return g_strndup(start + 1, (end - start) - 2);
GString* str = g_string_sized_new(end - start);
const guchar* c = (const guchar*)start + 1;
const guchar* m = NULL;
const guchar* s;
while (TRUE)
{
s = c;
/*!re2c
CHAR+ {
g_string_append_len(str, s, c - s);
continue;
}
CTL {
gchar ch = (gchar)s[1];
if (ch == 'b')
g_string_append_c(str, '\b');
else if (ch == 'n')
g_string_append_c(str, '\n');
else if (ch == 'r')
g_string_append_c(str, '\r');
else if (ch == 't')
g_string_append_c(str, '\t');
else if (ch == 'f')
g_string_append_c(str, '\f');
else
g_string_append_c(str, ch);
continue;
}
UNICODE {
guint ch = 0;
sscanf(s + 2, "%4x", &ch);
g_string_append_unichar(str, ch);
continue;
}
"\"" {
return g_string_free(str, FALSE);
}
. | "\n" | [\000] {
g_assert_not_reached();
}
*/
}
return NULL;
}
gint64 s_json_get_int(const gchar* json, gint64 fallback)
{
const gchar* start;
const gchar* end;
g_return_val_if_fail(json != NULL, fallback);
if (s_json_get_token(json, &start, &end) != TOK_NUMBER)
return fallback;
gchar* str = g_alloca(end - start + 1);
memcpy(str, start, end - start);
str[end - start] = 0;
gint64 v = fallback;
sscanf(str, "%" G_GINT64_FORMAT, &v);
return v;
}
gdouble s_json_get_double(const gchar* json, gdouble fallback)
{
const gchar* start;
const gchar* end;
g_return_val_if_fail(json != NULL, fallback);
if (s_json_get_token(json, &start, &end) != TOK_NUMBER)
return fallback;
gchar* str = g_alloca(end - start + 1);
memcpy(str, start, end - start);
str[end - start] = 0;
gdouble v = fallback;
sscanf(str, "%lf", &v);
return v;
}
gboolean s_json_get_bool(const gchar* json)
{
g_return_val_if_fail(json != NULL, FALSE);
gint token = s_json_get_token(json, NULL, NULL);
if (token == TOK_TRUE)
return TRUE;
return FALSE;
}
gboolean s_json_is_null(const gchar* json)
{
g_return_val_if_fail(json != NULL, FALSE);
gint token = s_json_get_token(json, NULL, NULL);
if (token == TOK_NULL)
return TRUE;
return FALSE;
}
gboolean s_json_string_match(const gchar* json_str, const gchar* c_str)
{
const gchar *start, *end;
gint token;
g_return_val_if_fail(json_str != NULL, FALSE);
g_return_val_if_fail(c_str != NULL, FALSE);
token = s_json_get_token(json_str, &start, &end);
if (token == TOK_NOESC_STRING)
{
// fast path
gsize json_len = ((end - start) - 2);
gint rs = strncmp(start + 1, c_str, json_len);
return rs == 0 ? strlen(c_str) == json_len : FALSE;
}
else if (token == TOK_STRING)
{
// slow path
gchar* str = s_json_get_string(json_str);
gint rs = strcmp(str, c_str);
g_free(str);
return rs == 0;
}
else
{
return FALSE;
}
}
// helpers
gchar* s_json_get_member_string(const gchar* json, const gchar* name)
{
g_return_val_if_fail(json != NULL, NULL);
g_return_val_if_fail(name != NULL, NULL);
const gchar* member = s_json_get_member(json, name);
if (member)
return s_json_get_string(member);
return NULL;
}
gint64 s_json_get_member_int(const gchar* json, const gchar* name, gint64 fallback)
{
g_return_val_if_fail(json != NULL, fallback);
g_return_val_if_fail(name != NULL, fallback);
const gchar* member = s_json_get_member(json, name);
if (member)
return s_json_get_int(member, fallback);
return fallback;
}
gdouble s_json_get_member_double(const gchar* json, const gchar* name, gdouble fallback)
{
g_return_val_if_fail(json != NULL, fallback);
g_return_val_if_fail(name != NULL, fallback);
const gchar* member = s_json_get_member(json, name);
if (member)
return s_json_get_double(member, fallback);
return fallback;
}
gboolean s_json_get_member_bool(const gchar* json, const gchar* name)
{
g_return_val_if_fail(json != NULL, FALSE);
g_return_val_if_fail(name != NULL, FALSE);
const gchar* member = s_json_get_member(json, name);
if (member)
return s_json_get_bool(member);
return FALSE;
}
gboolean s_json_member_is_null(const gchar* json, const gchar* name)
{
g_return_val_if_fail(json != NULL, FALSE);
g_return_val_if_fail(name != NULL, FALSE);
const gchar* member = s_json_get_member(json, name);
if (member)
return s_json_is_null(member);
return TRUE;
}
// generator api
struct _SJsonGen
{
GString* str;
};
SJsonGen* s_json_gen_new(void)
{
SJsonGen* gen = g_slice_new(SJsonGen);
gen->str = g_string_sized_new(512);
return gen;
}
static void strip_comma(SJsonGen* json)
{
if (json->str->len > 0)
{
if (json->str->str[json->str->len - 1] == ',')
g_string_truncate(json->str, json->str->len - 1);
}
}
void s_json_gen_start_object(SJsonGen* json)
{
g_return_if_fail(json != NULL);
g_string_append_c(json->str, '{');
}
void s_json_gen_end_object(SJsonGen* json)
{
g_return_if_fail(json != NULL);
strip_comma(json);
g_string_append(json->str, "},");
}
void s_json_gen_start_array(SJsonGen* json)
{
g_return_if_fail(json != NULL);
g_string_append_c(json->str, '[');
}
void s_json_gen_end_array(SJsonGen* json)
{
g_return_if_fail(json != NULL);
strip_comma(json);
g_string_append(json->str, "],");
}
static void escape_string(GString* str, const gchar* v)
{
g_return_if_fail(str != NULL);
g_return_if_fail(v != NULL);
const guchar* c = (const guchar*)v;
const guchar* m = NULL;
const guchar* s;
g_string_append_c(str, '"');
while (TRUE)
{
s = c;
/*!re2c
[\n] { g_string_append(str, "\\n"); continue; }
[\r] { g_string_append(str, "\\r"); continue; }
[\b] { g_string_append(str, "\\b"); continue; }
[\t] { g_string_append(str, "\\t"); continue; }
[\f] { g_string_append(str, "\\f"); continue; }
[\"] { g_string_append(str, "\\\""); continue; }
[\\] { g_string_append(str, "\\\\"); continue; }
[\000] {
break;
}
[^\n\r\b\t"\\\000]+ {
g_string_append_len(str, (gchar*)s, c - s);
continue;
}
*/
}
g_string_append_c(str, '"');
}
void s_json_gen_build(SJsonGen* json, const gchar* fmt, ...)
{
va_list args;
gchar* v;
g_return_if_fail(json != NULL);
g_return_if_fail(fmt != NULL);
va_start(args, fmt);
v = s_json_buildv(fmt, args);
va_end(args);
s_json_gen_json(json, v);
g_free(v);
}
void s_json_gen_json(SJsonGen* json, const gchar* v)
{
g_return_if_fail(json != NULL);
if (v)
{
g_string_append(json->str, v);
g_string_append_c(json->str, ',');
}
else
s_json_gen_null(json);
}
void s_json_gen_string(SJsonGen* json, const gchar* v)
{
g_return_if_fail(json != NULL);
if (v)
{
escape_string(json->str, v);
g_string_append_c(json->str, ',');
}
else
s_json_gen_null(json);
}
void s_json_gen_int(SJsonGen* json, gint64 v)
{
g_return_if_fail(json != NULL);
g_string_append_printf(json->str, "%" G_GINT64_FORMAT ",", v);
}
void s_json_gen_double(SJsonGen* json, gdouble v)
{
g_return_if_fail(json != NULL);
g_string_append_printf(json->str, "%lg,", v);
}
void s_json_gen_bool(SJsonGen* json, gboolean v)
{
g_return_if_fail(json != NULL);
g_string_append(json->str, v ? "true," : "false,");
}
void s_json_gen_null(SJsonGen* json)
{
g_return_if_fail(json != NULL);
g_string_append(json->str, "null,");
}
void s_json_gen_member_build(SJsonGen* json, const gchar* name, const gchar* fmt, ...)
{
va_list args;
gchar* v;
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
g_return_if_fail(fmt != NULL);
va_start(args, fmt);
v = s_json_buildv(fmt, args);
va_end(args);
s_json_gen_member_json(json, name, v);
g_free(v);
}
void s_json_gen_member_json(SJsonGen* json, const gchar* name, const gchar* v)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_json(json, v);
}
void s_json_gen_member_string(SJsonGen* json, const gchar* name, const gchar* v)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_string(json, v);
}
void s_json_gen_member_int(SJsonGen* json, const gchar* name, gint64 v)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_int(json, v);
}
void s_json_gen_member_double(SJsonGen* json, const gchar* name, gdouble v)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_double(json, v);
}
void s_json_gen_member_bool(SJsonGen* json, const gchar* name, gboolean v)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_bool(json, v);
}
void s_json_gen_member_null(SJsonGen* json, const gchar* name)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_null(json);
}
void s_json_gen_member_array(SJsonGen* json, const gchar* name)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_start_array(json);
}
void s_json_gen_member_object(SJsonGen* json, const gchar* name)
{
g_return_if_fail(json != NULL);
g_return_if_fail(name != NULL);
s_json_gen_string(json, name);
strip_comma(json);
g_string_append_c(json->str, ':');
s_json_gen_start_object(json);
}
gchar* s_json_gen_done(SJsonGen* json)
{
g_return_val_if_fail(json != NULL, NULL);
strip_comma(json);
gchar* str = g_string_free(json->str, FALSE);
g_slice_free(SJsonGen, json);
if (s_json_is_valid(str))
return str;
g_free(str);
return NULL;
}
// build
// formats:
// - % ? format
// format: sidbnjSJ
gchar* s_json_buildv(const gchar* format, va_list args)
{
g_return_val_if_fail(format != NULL, NULL);
GString* str = g_string_sized_new(strlen(format));
const guchar* c = (const guchar*)format;
const guchar* m = NULL;
const guchar* s;
#define IS_NULLABLE (s[1] == '?')
#define FMT_FULL(arg_type, code_format, code_leave) \
gboolean is_null = (IS_NULLABLE ? va_arg(args, gboolean) : FALSE); \
gchar fmt = s[IS_NULLABLE ? 2 : 1]; \
arg_type arg = va_arg(args, arg_type); \
if (is_null) { \
g_string_append(str, "null"); \
} else { \
code_format \
} \
code_leave \
continue;
#define FMT(arg_type, code) FMT_FULL(arg_type, code, )
while (TRUE)
{
s = c;
/*!re2c
(WS | "{" | "}" | "[" | "]" | NOESC_STRING | STRING | ":" | "," | NUMBER | "true" | "false" | "null")+ {
g_string_append_len(str, s, c - s);
continue;
}
IDENT {
g_string_append_c(str, '"');
g_string_append_len(str, s, c - s);
g_string_append_c(str, '"');
continue;
3179
}
FMT = "%" "?"?;
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