/*
  +----------------------------------------------------------------------+
  | PHP Version 5                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) 1997-2008 The PHP Group                                |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: Omar Kilani <omar@php.net>                                   |
  +----------------------------------------------------------------------+
*/

/* $Id$ */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "ext/standard/php_smart_str.h"
#include "utf8_to_utf16.h"
#include "JSON_parser.h"
#include "php_json.h"

static const char digits[] = "0123456789abcdef";

#define PHP_JSON_HEX_TAG	(1<<0)
#define PHP_JSON_HEX_AMP	(1<<1)
#define PHP_JSON_HEX_APOS	(1<<2)
#define PHP_JSON_HEX_QUOT	(1<<3)

/* {{{ json_functions[]
 *
 * Every user visible function must have an entry in json_functions[].
 */
const function_entry json_functions[] = {
	PHP_FE(json_encode, NULL)
	PHP_FE(json_decode, NULL)
	{NULL, NULL, NULL}  /* Must be the last line in json_functions[] */
};
/* }}} */

/* {{{ MINIT */
static PHP_MINIT_FUNCTION(json)
{
	REGISTER_LONG_CONSTANT("JSON_HEX_TAG",  PHP_JSON_HEX_TAG,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("JSON_HEX_AMP",  PHP_JSON_HEX_AMP,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("JSON_HEX_APOS", PHP_JSON_HEX_APOS, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("JSON_HEX_QUOT", PHP_JSON_HEX_QUOT, CONST_CS | CONST_PERSISTENT);

	return SUCCESS;
}
/* }}} */


/* {{{ json_module_entry
 */
zend_module_entry json_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
	STANDARD_MODULE_HEADER,
#endif
	"json",
	json_functions,
	PHP_MINIT(json),
	NULL,
	NULL,
	NULL,
	PHP_MINFO(json),
#if ZEND_MODULE_API_NO >= 20010901
	PHP_JSON_VERSION,
#endif
	STANDARD_MODULE_PROPERTIES
};
/* }}} */

#ifdef COMPILE_DL_JSON
ZEND_GET_MODULE(json)
#endif

/* {{{ PHP_MINFO_FUNCTION
 */
PHP_MINFO_FUNCTION(json)
{
	php_info_print_table_start();
	php_info_print_table_row(2, "json support", "enabled");
	php_info_print_table_row(2, "json version", PHP_JSON_VERSION);
	php_info_print_table_end();
}
/* }}} */

static void json_encode_r(smart_str *buf, zval *val, int options TSRMLS_DC);
static void json_escape_string(smart_str *buf, zstr s, int len, zend_uchar type, int options);

static int json_determine_array_type(zval **val TSRMLS_DC) /* {{{ */
{
	int i;
	HashTable *myht = HASH_OF(*val);

	i = myht ? zend_hash_num_elements(myht) : 0;
	if (i > 0) {
		zstr key;
		ulong index, idx;
		uint key_len;
		HashPosition pos;

		zend_hash_internal_pointer_reset_ex(myht, &pos);
		idx = 0;
		for (;; zend_hash_move_forward_ex(myht, &pos)) {
			i = zend_hash_get_current_key_ex(myht, &key, &key_len, &index, 0, &pos);
			if (i == HASH_KEY_NON_EXISTANT)
				break;

			if (i == HASH_KEY_IS_STRING || i == HASH_KEY_IS_UNICODE) {
				return 1;
			} else {
				if (index != idx) {
					return 1;
				}
			}
			idx++;
		}
	}

	return 0;
}
/* }}} */

static void json_encode_array(smart_str *buf, zval **val, int options TSRMLS_DC) /* {{{ */
{
	int i, r;
	HashTable *myht;

	if (Z_TYPE_PP(val) == IS_ARRAY) {
		myht = HASH_OF(*val);
		r = json_determine_array_type(val TSRMLS_CC);
	} else {
		myht = Z_OBJPROP_PP(val);
		r = 1;
	}

	if (myht && myht->nApplyCount > 1) {
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "recursion detected");
		smart_str_appendl(buf, "null", 4);
		return;
	}

	if (r == 0)
	{
		smart_str_appendc(buf, '[');
	}
	else
	{
		smart_str_appendc(buf, '{');
	}

	i = myht ? zend_hash_num_elements(myht) : 0;
	if (i > 0) {
		zstr key;
		zval **data;
		ulong index;
		uint key_len;
		HashPosition pos;
		HashTable *tmp_ht;
		int need_comma = 0;

		zend_hash_internal_pointer_reset_ex(myht, &pos);
		for (;; zend_hash_move_forward_ex(myht, &pos)) {
			i = zend_hash_get_current_key_ex(myht, &key, &key_len, &index, 0, &pos);
			if (i == HASH_KEY_NON_EXISTANT)
				break;

			if (zend_hash_get_current_data_ex(myht, (void **) &data, &pos) == SUCCESS) {
				tmp_ht = HASH_OF(*data);
				if (tmp_ht) {
					tmp_ht->nApplyCount++;
				}

				if (r == 0) {
					if (need_comma) {
						smart_str_appendc(buf, ',');
					} else {
						need_comma = 1;
					}
 
					json_encode_r(buf, *data, options TSRMLS_CC);
				} else if (r == 1) {
					if (i == HASH_KEY_IS_STRING ||
						i == HASH_KEY_IS_UNICODE) {
						if (key.s[0] == '\0' && Z_TYPE_PP(val) == IS_OBJECT) {
							/* Skip protected and private members. */
							continue;
						}

						if (need_comma) {
							smart_str_appendc(buf, ',');
						} else {
							need_comma = 1;
						}

						json_escape_string(buf, key, key_len - 1, (i==HASH_KEY_IS_UNICODE)?IS_UNICODE:IS_STRING, options);
						smart_str_appendc(buf, ':');

						json_encode_r(buf, *data, options TSRMLS_CC);
					} else {
						if (need_comma) {
							smart_str_appendc(buf, ',');
						} else {
							need_comma = 1;
						}
						
						smart_str_appendc(buf, '"');
						smart_str_append_long(buf, (long) index);
						smart_str_appendc(buf, '"');
						smart_str_appendc(buf, ':');

						json_encode_r(buf, *data, options TSRMLS_CC);
					}
				}

				if (tmp_ht) {
					tmp_ht->nApplyCount--;
				}
			}
		}
	}

	if (r == 0)
	{
		smart_str_appendc(buf, ']');
	}
	else
	{
		smart_str_appendc(buf, '}');
	}
}
/* }}} */

#define REVERSE16(us) (((us & 0xf) << 12) | (((us >> 4) & 0xf) << 8) | (((us >> 8) & 0xf) << 4) | ((us >> 12) & 0xf))

static void json_escape_string(smart_str *buf, zstr s, int len, zend_uchar type, int options) /* {{{ */
{
	int pos = 0;
	unsigned short us;
	unsigned short *utf16;

	if (len == 0)
	{
		smart_str_appendl(buf, "\"\"", 2);
		return;
	}

	if (type == IS_UNICODE) {
		utf16 = (unsigned short *) s.u;
	} else {	
		utf16 = (unsigned short *) safe_emalloc(len, sizeof(unsigned short), 0);

		len = utf8_to_utf16(utf16, s.s, len);
		if (len <= 0)
		{
			if (utf16)
			{
				efree(utf16);
			}

			smart_str_appendl(buf, "\"\"", 2);
			return;
		}
	}

	smart_str_appendc(buf, '"');

	while(pos < len)
	{
		us = utf16[pos++];

		switch (us)
		{
			case '"':
				{
					if (options & PHP_JSON_HEX_QUOT) {
						smart_str_appendl(buf, "\\u0022", 6);
					} else {
						smart_str_appendl(buf, "\\\"", 2);
					}
				}
				break;
			case '\\':
				{
					smart_str_appendl(buf, "\\\\", 2);
				}
				break;
			case '/':
				{
					smart_str_appendl(buf, "\\/", 2);
				}
				break;
			case '\b':
				{
					smart_str_appendl(buf, "\\b", 2);
				}
				break;
			case '\f':
				{
					smart_str_appendl(buf, "\\f", 2);
				}
				break;
			case '\n':
				{
					smart_str_appendl(buf, "\\n", 2);
				}
				break;
			case '\r':
				{
					smart_str_appendl(buf, "\\r", 2);
				}
				break;
			case '\t':
				{
					smart_str_appendl(buf, "\\t", 2);
				}
				break;
			case '<':
				{
					if (options & PHP_JSON_HEX_TAG) {
						smart_str_appendl(buf, "\\u003C", 6);
					} else {
						smart_str_appendc(buf, '<');
					}
				}
				break;
			case '>':
				{
					if (options & PHP_JSON_HEX_TAG) {
						smart_str_appendl(buf, "\\u003E", 6);
					} else {
						smart_str_appendc(buf, '>');
					}
				}
				break;
			case '&':
				{
					if (options & PHP_JSON_HEX_AMP) {
						smart_str_appendl(buf, "\\u0026", 6);
					} else {
						smart_str_appendc(buf, '&');
					}
				}
				break;
			case '\'':
				{
					if (options & PHP_JSON_HEX_APOS) {
						smart_str_appendl(buf, "\\u0027", 6);
					} else {
						smart_str_appendc(buf, '\'');
					}
				}
				break;
			default:
				{
					if (us >= ' ' && (us & 127) == us)
					{
						smart_str_appendc(buf, (unsigned char) us);
					}
					else
					{
						smart_str_appendl(buf, "\\u", 2);
						us = REVERSE16(us);

						smart_str_appendc(buf, digits[us & ((1 << 4) - 1)]);
						us >>= 4;
						smart_str_appendc(buf, digits[us & ((1 << 4) - 1)]);
						us >>= 4;
						smart_str_appendc(buf, digits[us & ((1 << 4) - 1)]);
						us >>= 4;
						smart_str_appendc(buf, digits[us & ((1 << 4) - 1)]);
					}
				}
				break;
		}
	}

	smart_str_appendc(buf, '"');

	if (type == IS_STRING) {
		efree(utf16);
	}
}
/* }}} */

static void json_encode_r(smart_str *buf, zval *val, int options TSRMLS_DC) /* {{{ */
{
	switch (Z_TYPE_P(val)) {
		case IS_NULL:
			smart_str_appendl(buf, "null", 4);
			break;
		case IS_BOOL:
			if (Z_BVAL_P(val))
			{
				smart_str_appendl(buf, "true", 4);
			}
			else
			{
				smart_str_appendl(buf, "false", 5);
			}
			break;
		case IS_LONG:
			smart_str_append_long(buf, Z_LVAL_P(val));
			break;
		case IS_DOUBLE:
			{
				char *d = NULL;
				int len;
				double dbl = Z_DVAL_P(val);

				if (!zend_isinf(dbl) && !zend_isnan(dbl)) {
					len = spprintf(&d, 0, "%.*k", (int) EG(precision), dbl);
					smart_str_appendl(buf, d, len);
					efree(d);
				} else {
					zend_error(E_WARNING, "[json] (json_encode_r) double %.9g does not conform to the JSON spec, encoded as 0.", dbl);
					smart_str_appendc(buf, '0');
				}
			}
			break;
		case IS_STRING:
		case IS_UNICODE:
			json_escape_string(buf, Z_UNIVAL_P(val), Z_UNILEN_P(val), Z_TYPE_P(val), options);
			break;
		case IS_ARRAY:
		case IS_OBJECT:
			json_encode_array(buf, &val, options TSRMLS_CC);
			break;
		default:
			zend_error(E_WARNING, "[json] (json_encode_r) type is unsupported, encoded as null.");
			smart_str_appendl(buf, "null", 4);
			break;
	}

	return;
}
/* }}} */

/* {{{ proto string json_encode(mixed data) U
   Returns the JSON representation of a value */
PHP_FUNCTION(json_encode)
{
	zval *parameter;
	smart_str buf = {0};
	long options = 0;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z|l", &parameter, &options) == FAILURE) {
		return;
	}

	json_encode_r(&buf, parameter, options TSRMLS_CC);

	/*
	 * Return as binary string, since the result is 99% likely to be just
	 * echo'ed out and we want to avoid overhead of double conversion.
	 */
	ZVAL_STRINGL(return_value, buf.c, buf.len, 1);

	smart_str_free(&buf);
}
/* }}} */

/* {{{ proto mixed json_decode(string json [, bool assoc]) U
   Decodes the JSON representation into a PHP value */
PHP_FUNCTION(json_decode)
{
	zstr str;
	int str_len, utf16_len;
	zend_uchar str_type;
	zend_bool assoc = 0; /* return JS objects as PHP objects by default */
	zval *z;
	unsigned short *utf16;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "t|b", &str, &str_len, &str_type, &assoc) == FAILURE) {
		return;
	}

	if (!str_len)
	{
		RETURN_NULL();
	}

	if (str_type == IS_UNICODE) {
		utf16 = str.u;
		utf16_len = str_len;
	} else {
		utf16 = (unsigned short *) safe_emalloc((str_len+1), sizeof(unsigned short), 0);

		utf16_len = utf8_to_utf16(utf16, str.s, str_len);
		if (utf16_len <= 0)
		{
			if (utf16)
			{
				efree(utf16);
			}

			RETURN_NULL();
		}
	}

	ALLOC_INIT_ZVAL(z);
	if (JSON_parser(z, utf16, utf16_len, assoc TSRMLS_CC))
	{
		*return_value = *z;

		FREE_ZVAL(z);
		if (str_type == IS_STRING) {
			efree(utf16);
		}
	} else if (str_type == IS_STRING) {
		double d;
		int type;
		long p;

		zval_dtor(z);
		FREE_ZVAL(z);
		efree(utf16);

		if (str_len == 4) {
			if (!strcasecmp(str.s, "null")) {
				RETURN_NULL();
			} else if (!strcasecmp(str.s, "true")) {
				RETURN_BOOL(1);
			}
		} else if (str_len == 5 && !strcasecmp(str.s, "false")) {
			RETURN_BOOL(0);
		}
		if ((type = is_numeric_string(str.s, str_len, &p, &d, 0)) != 0) {
			if (type == IS_LONG) {
				RETURN_LONG(p);
			} else if (type == IS_DOUBLE) {
				RETURN_DOUBLE(d);
			}
		}
		if (str_len > 1 && *str.s == '"' && str.s[str_len-1] == '"') {
			RETURN_STRINGL(str.s+1, str_len-2, 1);
		} else {
			RETURN_STRINGL(str.s, str_len, 1);
		}
	} else {
		double d;
		int type;
		long p;

		zval_dtor(z);
		FREE_ZVAL(z);

		if (str_len == 4) {
			if (ZEND_U_CASE_EQUAL(IS_UNICODE, str, str_len, "null", sizeof("null")-1)) {
				RETURN_NULL();
			} else if (ZEND_U_CASE_EQUAL(IS_UNICODE, str, str_len, "true", sizeof("true")-1)) {
				RETURN_BOOL(1);
			}
		} else if (str_len == 5 && ZEND_U_CASE_EQUAL(IS_UNICODE, str, str_len, "false", sizeof("false")-1)) {
			RETURN_BOOL(0);
		}
		if ((type = is_numeric_unicode(str.u, str_len, &p, &d, 0)) != 0) {
			if (type == IS_LONG) {
				RETURN_LONG(p);
			} else if (type == IS_DOUBLE) {
				RETURN_DOUBLE(d);
			}
		}
		if (str_len > 1 && *str.u == 0x22 /*'"'*/ && str.u[str_len-1] == 0x22 /*'"'*/) {
			RETURN_UNICODEL(str.u+1, str_len-2, 1);
		} else {
			RETURN_UNICODEL(str.u, str_len, 1);
		}
	}
}
/* }}} */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: noet sw=4 ts=4
 * vim<600: noet sw=4 ts=4
 */