[101] | 1 | /**
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| 2 | * JSON Simple/Stacked/Stateful Lexer.
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| 3 | * - Does not buffer data
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| 4 | * - Maintains state
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| 5 | * - Callback oriented
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| 6 | * - Lightweight and fast. One source file and one header file
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| 7 | *
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| 8 | * Copyright (C) 2012-2015 Mark Nunberg
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| 9 | * See included LICENSE file for license details.
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| 10 | */
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| 11 | /* copy from LICENSE file
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| 12 | Copyright (c) 2012-2015 M. Nunberg, mnunberg@haskalah.org
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| 13 |
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| 14 | Permission is hereby granted, free of charge, to any person obtaining
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| 15 | a copy of this software and associated documentation files (the
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| 16 | "Software"), to deal in the Software without restriction, including
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| 17 | without limitation the rights to use, copy, modify, merge, publish,
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| 18 | distribute, sublicense, and/or sell copies of the Software, and to
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| 19 | permit persons to whom the Software is furnished to do so, subject to
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| 20 | the following conditions:
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| 21 |
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| 22 | The above copyright notice and this permission notice shall be
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| 23 | included in all copies or substantial portions of the Software.
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| 24 |
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| 25 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 26 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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| 27 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 28 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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| 29 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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| 30 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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| 31 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 32 | */
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| 33 | #ifndef JSONSL_H_
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| 34 | #define JSONSL_H_
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| 35 |
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| 36 | #include <stdio.h>
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| 37 | #include <stdlib.h>
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| 38 | #include <stddef.h>
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| 39 | #include <string.h>
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| 40 | #include <t_stddef.h>
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| 41 | #include <t_syslog.h>
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| 42 | #include <wchar.h>
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| 43 |
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| 44 | #ifdef __cplusplus
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| 45 | extern "C" {
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| 46 | #endif /* __cplusplus */
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| 47 |
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| 48 | #ifdef JSONSL_USE_WCHAR
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| 49 | typedef jsonsl_char_t wchar_t;
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| 50 | typedef jsonsl_uchar_t unsigned wchar_t;
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| 51 | #else
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| 52 | typedef char jsonsl_char_t;
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| 53 | typedef unsigned char jsonsl_uchar_t;
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| 54 | #endif /* JSONSL_USE_WCHAR */
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| 55 |
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| 56 | /* Stolen from http-parser.h, and possibly others */
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| 57 | #if defined(_WIN32) && !defined(__MINGW32__) && (!defined(_MSC_VER) || _MSC_VER<1600)
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| 58 | typedef __int8 int8_t;
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| 59 | typedef unsigned __int8 uint8_t;
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| 60 | typedef __int16 int16_t;
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| 61 | typedef unsigned __int16 uint16_t;
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| 62 | typedef __int32 int32_t;
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| 63 | typedef unsigned __int32 uint32_t;
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| 64 | typedef __int64 int64_t;
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| 65 | typedef unsigned __int64 uint64_t;
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| 66 | #if !defined(_MSC_VER) || _MSC_VER<1400
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| 67 | typedef unsigned int size_t;
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| 68 | typedef int ssize_t;
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| 69 | #endif
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| 70 | #else
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| 71 | #include <stdint.h>
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| 72 | #endif
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| 73 |
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| 74 | #ifndef _MSC_VER
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| 75 | #ifndef sscanf_s
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| 76 | #define sscanf_s(frm, frmc, ...) sscanf(frm, __VA_ARGS__)
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| 77 | #endif
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| 78 | #endif
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| 79 |
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| 80 | #if (!defined(JSONSL_STATE_GENERIC)) && (!defined(JSONSL_STATE_USER_FIELDS))
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| 81 | #define JSONSL_STATE_GENERIC
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| 82 | #endif /* !defined JSONSL_STATE_GENERIC */
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| 83 |
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| 84 | #ifdef JSONSL_STATE_GENERIC
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| 85 | #define JSONSL_STATE_USER_FIELDS
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| 86 | #endif /* JSONSL_STATE_GENERIC */
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| 87 |
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| 88 | #ifndef JSONSL_API
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| 89 | /**
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| 90 | * We require a /DJSONSL_DLL so that users already using this as a static
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| 91 | * or embedded library don't get confused
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| 92 | */
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| 93 | #if defined(_WIN32) && defined(JSONSL_DLL)
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| 94 | #define JSONSL_API __declspec(dllexport)
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| 95 | #else
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| 96 | #define JSONSL_API
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| 97 | #endif /* _WIN32 */
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| 98 |
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| 99 | #endif /* !JSONSL_API */
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| 100 |
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| 101 | #ifndef JSONSL_INLINE
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| 102 | #if defined(_MSC_VER)
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| 103 | #define JSONSL_INLINE __inline
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| 104 | #elif defined(__GNUC__)
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| 105 | #define JSONSL_INLINE __inline__
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| 106 | #else
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| 107 | #define JSONSL_INLINE inline
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| 108 | #endif /* _MSC_VER or __GNUC__ */
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| 109 | #endif /* JSONSL_INLINE */
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| 110 |
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| 111 | #define JSONSL_MAX_LEVELS 512
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| 112 |
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| 113 | struct jsonsl_st;
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| 114 | typedef struct jsonsl_st *jsonsl_t;
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| 115 |
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| 116 | typedef struct jsonsl_jpr_st* jsonsl_jpr_t;
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| 117 |
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| 118 | /**
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| 119 | * This flag is true when AND'd against a type whose value
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| 120 | * must be in "quoutes" i.e. T_HKEY and T_STRING
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| 121 | */
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| 122 | #define JSONSL_Tf_STRINGY 0xffff00
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| 123 |
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| 124 | /**
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| 125 | * Constant representing the special JSON types.
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| 126 | * The values are special and aid in speed (the OBJECT and LIST
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| 127 | * values are the char literals of their openings).
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| 128 | *
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| 129 | * Their actual value is a character which attempts to resemble
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| 130 | * some mnemonic reference to the actual type.
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| 131 | *
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| 132 | * If new types are added, they must fit into the ASCII printable
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| 133 | * range (so they should be AND'd with 0x7f and yield something
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| 134 | * meaningful)
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| 135 | */
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| 136 | #define JSONSL_XTYPE \
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| 137 | X(STRING, '"'|JSONSL_Tf_STRINGY) \
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| 138 | X(HKEY, '#'|JSONSL_Tf_STRINGY) \
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| 139 | X(OBJECT, '{') \
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| 140 | X(LIST, '[') \
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| 141 | X(SPECIAL, '^') \
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| 142 | X(UESCAPE, 'u')
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| 143 | typedef enum {
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| 144 | #define X(o, c) \
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| 145 | JSONSL_T_##o = c,
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| 146 | JSONSL_XTYPE
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| 147 | JSONSL_T_UNKNOWN = '?',
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| 148 | /* Abstract 'root' object */
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| 149 | JSONSL_T_ROOT = 0
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| 150 | #undef X
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| 151 | } jsonsl_type_t;
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| 152 |
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| 153 | /**
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| 154 | * Subtypes for T_SPECIAL. We define them as flags
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| 155 | * because more than one type can be applied to a
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| 156 | * given object.
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| 157 | */
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| 158 |
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| 159 | #define JSONSL_XSPECIAL \
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| 160 | X(NONE, 0) \
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| 161 | X(SIGNED, 1<<0) \
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| 162 | X(UNSIGNED, 1<<1) \
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| 163 | X(TRUE, 1<<2) \
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| 164 | X(FALSE, 1<<3) \
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| 165 | X(NULL, 1<<4) \
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| 166 | X(FLOAT, 1<<5) \
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| 167 | X(EXPONENT, 1<<6) \
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| 168 | X(NONASCII, 1<<7)
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| 169 | typedef enum {
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| 170 | #define X(o,b) \
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| 171 | JSONSL_SPECIALf_##o = b,
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| 172 | JSONSL_XSPECIAL
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| 173 | #undef X
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| 174 | /* Handy flags for checking */
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| 175 | JSONSL_SPECIALf_UNKNOWN = 1 << 8,
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| 176 | JSONSL_SPECIALf_NUMERIC = (JSONSL_SPECIALf_SIGNED|JSONSL_SPECIALf_UNSIGNED),
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| 177 | JSONSL_SPECIALf_BOOLEAN = (JSONSL_SPECIALf_TRUE|JSONSL_SPECIALf_FALSE),
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| 178 | /* For non-simple numeric types */
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| 179 | JSONSL_SPECIALf_NUMNOINT = (JSONSL_SPECIALf_FLOAT|JSONSL_SPECIALf_EXPONENT)
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| 180 | } jsonsl_special_t;
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| 181 |
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| 182 |
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| 183 | /**
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| 184 | * These are the various types of stack (or other) events
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| 185 | * which will trigger a callback.
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| 186 | * Like the type constants, this are also mnemonic
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| 187 | */
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| 188 | #define JSONSL_XACTION \
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| 189 | X(PUSH, '+') \
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| 190 | X(POP, '-') \
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| 191 | X(UESCAPE, 'U') \
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| 192 | X(ERROR, '!')
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| 193 | typedef enum {
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| 194 | #define X(a,c) \
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| 195 | JSONSL_ACTION_##a = c,
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| 196 | JSONSL_XACTION
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| 197 | JSONSL_ACTION_UNKNOWN = '?'
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| 198 | #undef X
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| 199 | } jsonsl_action_t;
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| 200 |
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| 201 |
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| 202 | /**
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| 203 | * Various errors which may be thrown while parsing JSON
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| 204 | */
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| 205 | #define JSONSL_XERR \
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| 206 | /* Trailing garbage characters */ \
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| 207 | X(GARBAGE_TRAILING) \
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| 208 | /* We were expecting a 'special' (numeric, true, false, null) */ \
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| 209 | X(SPECIAL_EXPECTED) \
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| 210 | /* Found a stray token */ \
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| 211 | X(STRAY_TOKEN) \
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| 212 | /* We were expecting a token before this one */ \
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| 213 | X(MISSING_TOKEN) \
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| 214 | /* Cannot insert because the container is not ready */ \
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| 215 | X(CANT_INSERT) \
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| 216 | /* Found a '\' outside a string */ \
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| 217 | X(ESCAPE_OUTSIDE_STRING) \
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| 218 | /* Found a ':' outside of a hash */ \
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| 219 | X(KEY_OUTSIDE_OBJECT) \
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| 220 | /* found a string outside of a container */ \
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| 221 | X(STRING_OUTSIDE_CONTAINER) \
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| 222 | /* Found a null byte in middle of string */ \
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| 223 | X(FOUND_NULL_BYTE) \
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| 224 | /* Current level exceeds limit specified in constructor */ \
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| 225 | X(LEVELS_EXCEEDED) \
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| 226 | /* Got a } as a result of an opening [ or vice versa */ \
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| 227 | X(BRACKET_MISMATCH) \
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| 228 | /* We expected a key, but got something else instead */ \
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| 229 | X(HKEY_EXPECTED) \
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| 230 | /* We got an illegal control character (bad whitespace or something) */ \
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| 231 | X(WEIRD_WHITESPACE) \
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| 232 | /* Found a \u-escape, but there were less than 4 following hex digits */ \
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| 233 | X(UESCAPE_TOOSHORT) \
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| 234 | /* Invalid two-character escape */ \
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| 235 | X(ESCAPE_INVALID) \
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| 236 | /* Trailing comma */ \
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| 237 | X(TRAILING_COMMA) \
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| 238 | /* An invalid number was passed in a numeric field */ \
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| 239 | X(INVALID_NUMBER) \
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| 240 | /* The following are for JPR Stuff */ \
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| 241 | \
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| 242 | /* Found a literal '%' but it was only followed by a single valid hex digit */ \
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| 243 | X(PERCENT_BADHEX) \
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| 244 | /* jsonpointer URI is malformed '/' */ \
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| 245 | X(JPR_BADPATH) \
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| 246 | /* Duplicate slash */ \
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| 247 | X(JPR_DUPSLASH) \
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| 248 | /* No leading root */ \
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| 249 | X(JPR_NOROOT) \
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| 250 | /* Allocation failure */ \
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| 251 | X(ENOMEM)
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| 252 |
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| 253 | typedef enum {
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| 254 | JSONSL_ERROR_SUCCESS = 0,
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| 255 | #define X(e) \
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| 256 | JSONSL_ERROR_##e,
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| 257 | JSONSL_XERR
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| 258 | #undef X
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| 259 | JSONSL_ERROR_GENERIC
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| 260 | } jsonsl_error_t;
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| 261 |
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| 262 |
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| 263 | /**
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| 264 | * A state is a single level of the stack.
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| 265 | * Non-private data (i.e. the 'data' field, see the STATE_GENERIC section)
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| 266 | * will remain in tact until the item is popped.
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| 267 | *
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| 268 | * As a result, it means a parent state object may be accessed from a child
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| 269 | * object, (the parents fields will all be valid). This allows a user to create
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| 270 | * an ad-hoc hierarchy on top of the JSON one.
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| 271 | *
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| 272 | */
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| 273 | struct jsonsl_state_st {
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| 274 | /**
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| 275 | * The JSON object type
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| 276 | */
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| 277 | unsigned type;
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| 278 |
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| 279 | /** If this element is special, then its extended type is here */
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| 280 | unsigned special_flags;
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| 281 |
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| 282 | /**
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| 283 | * The position (in terms of number of bytes since the first call to
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| 284 | * jsonsl_feed()) at which the state was first pushed. This includes
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| 285 | * opening tokens, if applicable.
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| 286 | *
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| 287 | * @note For strings (i.e. type & JSONSL_Tf_STRINGY is nonzero) this will
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| 288 | * be the position of the first quote.
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| 289 | *
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| 290 | * @see jsonsl_st::pos which contains the _current_ position and can be
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| 291 | * used during a POP callback to get the length of the element.
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| 292 | */
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| 293 | size_t pos_begin;
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| 294 |
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| 295 | /**FIXME: This is redundant as the same information can be derived from
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| 296 | * jsonsl_st::pos at pop-time */
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| 297 | size_t pos_cur;
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| 298 |
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| 299 | /**
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| 300 | * Level of recursion into nesting. This is mainly a convenience
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| 301 | * variable, as this can technically be deduced from the lexer's
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| 302 | * level parameter (though the logic is not that simple)
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| 303 | */
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| 304 | unsigned int level;
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| 305 |
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| 306 |
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| 307 | /**
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| 308 | * how many elements in the object/list.
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| 309 | * For objects (hashes), an element is either
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| 310 | * a key or a value. Thus for one complete pair,
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| 311 | * nelem will be 2.
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| 312 | *
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| 313 | * For special types, this will hold the sum of the digits.
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| 314 | * This only holds true for values which are simple signed/unsigned
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| 315 | * numbers. Otherwise a special flag is set, and extra handling is not
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| 316 | * performed.
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| 317 | */
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| 318 | uint64_t nelem;
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| 319 |
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| 320 |
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| 321 |
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| 322 | /*TODO: merge this and special_flags into a union */
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| 323 |
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| 324 |
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| 325 | /**
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| 326 | * Useful for an opening nest, this will prevent a callback from being
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| 327 | * invoked on this item or any of its children
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| 328 | */
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| 329 | int ignore_callback;
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| 330 |
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| 331 | /**
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| 332 | * Counter which is incremented each time an escape ('\') is encountered.
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| 333 | */
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| 334 | unsigned int nescapes;
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| 335 |
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| 336 | /**
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| 337 | * Put anything you want here. if JSONSL_STATE_USER_FIELDS is here, then
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| 338 | * the macro expansion happens here.
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| 339 | *
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| 340 | * You can use these fields to store hierarchical or 'tagging' information
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| 341 | * for specific objects.
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| 342 | *
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| 343 | * See the documentation above for the lifetime of the state object (i.e.
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| 344 | * if the private data points to allocated memory, it should be freed
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| 345 | * when the object is popped, as the state object will be re-used)
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| 346 | */
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| 347 | #ifndef JSONSL_STATE_GENERIC
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| 348 | JSONSL_STATE_USER_FIELDS
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| 349 | #else
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| 350 |
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| 351 | /**
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| 352 | * Otherwise, this is a simple void * pointer for anything you want
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| 353 | */
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| 354 | void *data;
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| 355 | #endif /* JSONSL_STATE_USER_FIELDS */
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| 356 | };
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| 357 |
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| 358 | /*
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| 359 | * So now we need some special structure for keeping the
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| 360 | * JPR info in sync. Preferrably all in a single block
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| 361 | * of memory (there's no need for separate allocations.
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| 362 | * So we will define a 'table' with the following layout
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| 363 | *
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| 364 | * Level nPosbl JPR1_last JPR2_last JPR3_last
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| 365 | *
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| 366 | * 0 1 NOMATCH POSSIBLE POSSIBLE
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| 367 | * 1 0 NOMATCH NOMATCH COMPLETE
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| 368 | * [ table ends here because no further path is possible]
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| 369 | *
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| 370 | * Where the JPR..n corresponds to the number of JPRs
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| 371 | * requested, and nPosble is a quick flag to determine
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| 372 | *
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| 373 | * the number of possibilities. In the future this might
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| 374 | * be made into a proper 'jump' table,
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| 375 | *
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| 376 | * Since we always mark JPRs from the higher levels descending
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| 377 | * into the lower ones, a prospective child match would first
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| 378 | * look at the parent table to check the possibilities, and then
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| 379 | * see which ones were possible..
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| 380 | *
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| 381 | * Thus, the size of this blob would be (and these are all ints here)
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| 382 | * nLevels * nJPR * 2.
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| 383 | *
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| 384 | * the 'Width' of the table would be nJPR*2, and the 'height' would be
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| 385 | * nlevels
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| 386 | */
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| 387 |
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| 388 | /**
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| 389 | * This is called when a stack change ocurs.
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| 390 | *
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| 391 | * @param jsn The lexer
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| 392 | * @param action The type of action, this can be PUSH or POP
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| 393 | * @param state A pointer to the stack currently affected by the action
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| 394 | * @param at A pointer to the position of the input buffer which triggered
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| 395 | * this action.
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| 396 | */
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| 397 | typedef void (*jsonsl_stack_callback)(
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| 398 | jsonsl_t jsn,
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| 399 | jsonsl_action_t action,
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| 400 | struct jsonsl_state_st* state,
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| 401 | const jsonsl_char_t *at);
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| 402 |
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| 403 |
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| 404 | /**
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| 405 | * This is called when an error is encountered.
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| 406 | * Sometimes it's possible to 'erase' characters (by replacing them
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| 407 | * with whitespace). If you think you have corrected the error, you
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| 408 | * can return a true value, in which case the parser will backtrack
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| 409 | * and try again.
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| 410 | *
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| 411 | * @param jsn The lexer
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| 412 | * @param error The error which was thrown
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| 413 | * @param state the current state
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| 414 | * @param a pointer to the position of the input buffer which triggered
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| 415 | * the error. Note that this is not const, this is because you have the
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| 416 | * possibility of modifying the character in an attempt to correct the
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| 417 | * error
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| 418 | *
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| 419 | * @return zero to bail, nonzero to try again (this only makes sense if
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| 420 | * the input buffer has been modified by this callback)
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| 421 | */
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| 422 | typedef int (*jsonsl_error_callback)(
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| 423 | jsonsl_t jsn,
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| 424 | jsonsl_error_t error,
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| 425 | struct jsonsl_state_st* state,
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| 426 | jsonsl_char_t *at);
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| 427 |
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| 428 | struct jsonsl_st {
|
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| 429 | /** Public, read-only */
|
---|
| 430 |
|
---|
| 431 | /** This is the current level of the stack */
|
---|
| 432 | unsigned int level;
|
---|
| 433 |
|
---|
| 434 | /** Flag set to indicate we should stop processing */
|
---|
| 435 | unsigned int stopfl;
|
---|
| 436 |
|
---|
| 437 | /**
|
---|
| 438 | * This is the current position, relative to the beginning
|
---|
| 439 | * of the stream.
|
---|
| 440 | */
|
---|
| 441 | size_t pos;
|
---|
| 442 |
|
---|
| 443 | /** This is the 'bytes' variable passed to feed() */
|
---|
| 444 | const jsonsl_char_t *base;
|
---|
| 445 |
|
---|
| 446 | /** Callback invoked for PUSH actions */
|
---|
| 447 | jsonsl_stack_callback action_callback_PUSH;
|
---|
| 448 |
|
---|
| 449 | /** Callback invoked for POP actions */
|
---|
| 450 | jsonsl_stack_callback action_callback_POP;
|
---|
| 451 |
|
---|
| 452 | /** Default callback for any action, if neither PUSH or POP callbacks are defined */
|
---|
| 453 | jsonsl_stack_callback action_callback;
|
---|
| 454 |
|
---|
| 455 | /** Do not invoke callbacks for objects deeper than this level */
|
---|
| 456 | unsigned int max_callback_level;
|
---|
| 457 |
|
---|
| 458 | /** The error callback. Invoked when an error happens. Should not be NULL */
|
---|
| 459 | jsonsl_error_callback error_callback;
|
---|
| 460 |
|
---|
| 461 | /* these are boolean flags you can modify. You will be called
|
---|
| 462 | * about notification for each of these types if the corresponding
|
---|
| 463 | * variable is true.
|
---|
| 464 | */
|
---|
| 465 |
|
---|
| 466 | /**
|
---|
| 467 | * @name Callback Booleans.
|
---|
| 468 | * These determine whether a callback is to be invoked for certain types of objects
|
---|
| 469 | * @{*/
|
---|
| 470 |
|
---|
| 471 | /** Boolean flag to enable or disable the invokcation for events on this type*/
|
---|
| 472 | int call_SPECIAL;
|
---|
| 473 | int call_OBJECT;
|
---|
| 474 | int call_LIST;
|
---|
| 475 | int call_STRING;
|
---|
| 476 | int call_HKEY;
|
---|
| 477 | /*@}*/
|
---|
| 478 |
|
---|
| 479 | /**
|
---|
| 480 | * @name u-Escape handling
|
---|
| 481 | * Special handling for the \\u-f00d type sequences. These are meant
|
---|
| 482 | * to be translated back into the corresponding octet(s).
|
---|
| 483 | * A special callback (if set) is invoked with *at=='u'. An application
|
---|
| 484 | * may wish to temporarily suspend parsing and handle the 'u-' sequence
|
---|
| 485 | * internally (or not).
|
---|
| 486 | */
|
---|
| 487 |
|
---|
| 488 | /*@{*/
|
---|
| 489 |
|
---|
| 490 | /** Callback to be invoked for a u-escape */
|
---|
| 491 | jsonsl_stack_callback action_callback_UESCAPE;
|
---|
| 492 |
|
---|
| 493 | /** Boolean flag, whether to invoke the callback */
|
---|
| 494 | int call_UESCAPE;
|
---|
| 495 |
|
---|
| 496 | /** Boolean flag, whether we should return after encountering a u-escape:
|
---|
| 497 | * the callback is invoked and then we return if this is true
|
---|
| 498 | */
|
---|
| 499 | int return_UESCAPE;
|
---|
| 500 | /*@}*/
|
---|
| 501 |
|
---|
| 502 | struct {
|
---|
| 503 | int allow_trailing_comma;
|
---|
| 504 | } options;
|
---|
| 505 |
|
---|
| 506 | /** Put anything here */
|
---|
| 507 | void *data;
|
---|
| 508 |
|
---|
| 509 | /*@{*/
|
---|
| 510 | /** Private */
|
---|
| 511 | int in_escape;
|
---|
| 512 | char expecting;
|
---|
| 513 | char tok_last;
|
---|
| 514 | int can_insert;
|
---|
| 515 | unsigned int levels_max;
|
---|
| 516 |
|
---|
| 517 | #ifndef JSONSL_NO_JPR
|
---|
| 518 | size_t jpr_count;
|
---|
| 519 | jsonsl_jpr_t *jprs;
|
---|
| 520 |
|
---|
| 521 | /* Root pointer for JPR matching information */
|
---|
| 522 | size_t *jpr_root;
|
---|
| 523 | #endif /* JSONSL_NO_JPR */
|
---|
| 524 | /*@}*/
|
---|
| 525 |
|
---|
| 526 | /**
|
---|
| 527 | * This is the stack. Its upper bound is levels_max, or the
|
---|
| 528 | * nlevels argument passed to jsonsl_new. If you modify this structure,
|
---|
| 529 | * make sure that this member is last.
|
---|
| 530 | */
|
---|
| 531 | struct jsonsl_state_st stack[1];
|
---|
| 532 | };
|
---|
| 533 |
|
---|
| 534 |
|
---|
| 535 | /**
|
---|
| 536 | * Creates a new lexer object, with capacity for recursion up to nlevels
|
---|
| 537 | *
|
---|
| 538 | * @param nlevels maximum recursion depth
|
---|
| 539 | */
|
---|
| 540 | JSONSL_API
|
---|
| 541 | jsonsl_t jsonsl_new(struct jsonsl_st *jsn, int nlevels);
|
---|
| 542 |
|
---|
| 543 | /**
|
---|
| 544 | * Feeds data into the lexer.
|
---|
| 545 | *
|
---|
| 546 | * @param jsn the lexer object
|
---|
| 547 | * @param bytes new data to be fed
|
---|
| 548 | * @param nbytes size of new data
|
---|
| 549 | */
|
---|
| 550 | JSONSL_API
|
---|
| 551 | void jsonsl_feed(jsonsl_t jsn, const jsonsl_char_t *bytes, size_t nbytes);
|
---|
| 552 |
|
---|
| 553 | /**
|
---|
| 554 | * Resets the internal parser state. This does not free the parser
|
---|
| 555 | * but does clean it internally, so that the next time feed() is called,
|
---|
| 556 | * it will be treated as a new stream
|
---|
| 557 | *
|
---|
| 558 | * @param jsn the lexer
|
---|
| 559 | */
|
---|
| 560 | JSONSL_API
|
---|
| 561 | void jsonsl_reset(jsonsl_t jsn);
|
---|
| 562 |
|
---|
| 563 | /**
|
---|
| 564 | * Frees the lexer, cleaning any allocated memory taken
|
---|
| 565 | *
|
---|
| 566 | * @param jsn the lexer
|
---|
| 567 | */
|
---|
| 568 | JSONSL_API
|
---|
| 569 | void jsonsl_destroy(jsonsl_t jsn);
|
---|
| 570 |
|
---|
| 571 | /**
|
---|
| 572 | * Gets the 'parent' element, given the current one
|
---|
| 573 | *
|
---|
| 574 | * @param jsn the lexer
|
---|
| 575 | * @param cur the current nest, which should be a struct jsonsl_nest_st
|
---|
| 576 | */
|
---|
| 577 | static JSONSL_INLINE
|
---|
| 578 | struct jsonsl_state_st *jsonsl_last_state(const jsonsl_t jsn,
|
---|
| 579 | const struct jsonsl_state_st *state)
|
---|
| 580 | {
|
---|
| 581 | /* Don't complain about overriding array bounds */
|
---|
| 582 | if (state->level > 1) {
|
---|
| 583 | return jsn->stack + state->level - 1;
|
---|
| 584 | } else {
|
---|
| 585 | return NULL;
|
---|
| 586 | }
|
---|
| 587 | }
|
---|
| 588 |
|
---|
| 589 | /**
|
---|
| 590 | * Gets the state of the last fully consumed child of this parent. This is
|
---|
| 591 | * only valid in the parent's POP callback.
|
---|
| 592 | *
|
---|
| 593 | * @param the lexer
|
---|
| 594 | * @return A pointer to the child.
|
---|
| 595 | */
|
---|
| 596 | static JSONSL_INLINE
|
---|
| 597 | struct jsonsl_state_st *jsonsl_last_child(const jsonsl_t jsn,
|
---|
| 598 | const struct jsonsl_state_st *parent)
|
---|
| 599 | {
|
---|
| 600 | return jsn->stack + (parent->level + 1);
|
---|
| 601 | }
|
---|
| 602 |
|
---|
| 603 | /**Call to instruct the parser to stop parsing and return. This is valid
|
---|
| 604 | * only from within a callback */
|
---|
| 605 | static JSONSL_INLINE
|
---|
| 606 | void jsonsl_stop(jsonsl_t jsn)
|
---|
| 607 | {
|
---|
| 608 | jsn->stopfl = 1;
|
---|
| 609 | }
|
---|
| 610 |
|
---|
| 611 | /**
|
---|
| 612 | * This enables receiving callbacks on all events. Doesn't do
|
---|
| 613 | * anything special but helps avoid some boilerplate.
|
---|
| 614 | * This does not touch the UESCAPE callbacks or flags.
|
---|
| 615 | */
|
---|
| 616 | static JSONSL_INLINE
|
---|
| 617 | void jsonsl_enable_all_callbacks(jsonsl_t jsn)
|
---|
| 618 | {
|
---|
| 619 | jsn->call_HKEY = 1;
|
---|
| 620 | jsn->call_STRING = 1;
|
---|
| 621 | jsn->call_OBJECT = 1;
|
---|
| 622 | jsn->call_SPECIAL = 1;
|
---|
| 623 | jsn->call_LIST = 1;
|
---|
| 624 | }
|
---|
| 625 |
|
---|
| 626 | /**
|
---|
| 627 | * A macro which returns true if the current state object can
|
---|
| 628 | * have children. This means a list type or an object type.
|
---|
| 629 | */
|
---|
| 630 | #define JSONSL_STATE_IS_CONTAINER(state) \
|
---|
| 631 | (state->type == JSONSL_T_OBJECT || state->type == JSONSL_T_LIST)
|
---|
| 632 |
|
---|
| 633 | /**
|
---|
| 634 | * These two functions, dump a string representation
|
---|
| 635 | * of the error or type, respectively. They will never
|
---|
| 636 | * return NULL
|
---|
| 637 | */
|
---|
| 638 | JSONSL_API
|
---|
| 639 | const char* jsonsl_strerror(jsonsl_error_t err);
|
---|
| 640 | JSONSL_API
|
---|
| 641 | const char* jsonsl_strtype(jsonsl_type_t jt);
|
---|
| 642 |
|
---|
| 643 | /**
|
---|
| 644 | * Dumps global metrics to the screen. This is a noop unless
|
---|
| 645 | * jsonsl was compiled with JSONSL_USE_METRICS
|
---|
| 646 | */
|
---|
| 647 | JSONSL_API
|
---|
| 648 | void jsonsl_dump_global_metrics(void);
|
---|
| 649 |
|
---|
| 650 | /* This macro just here for editors to do code folding */
|
---|
| 651 | #ifndef JSONSL_NO_JPR
|
---|
| 652 |
|
---|
| 653 | /**
|
---|
| 654 | * @name JSON Pointer API
|
---|
| 655 | *
|
---|
| 656 | * JSONPointer API. This isn't really related to the lexer (at least not yet)
|
---|
| 657 | * JSONPointer provides an extremely simple specification for providing
|
---|
| 658 | * locations within JSON objects. We will extend it a bit and allow for
|
---|
| 659 | * providing 'wildcard' characters by which to be able to 'query' the stream.
|
---|
| 660 | *
|
---|
| 661 | * See http://tools.ietf.org/html/draft-pbryan-zyp-json-pointer-00
|
---|
| 662 | *
|
---|
| 663 | * Currently I'm implementing the 'single query' API which can only use a single
|
---|
| 664 | * query component. In the future I will integrate my yet-to-be-published
|
---|
| 665 | * Boyer-Moore-esque prefix searching implementation, in order to allow
|
---|
| 666 | * multiple paths to be merged into one for quick and efficient searching.
|
---|
| 667 | *
|
---|
| 668 | *
|
---|
| 669 | * JPR (as we'll refer to it within the source) can be used by splitting
|
---|
| 670 | * the components into mutliple sections, and incrementally 'track' each
|
---|
| 671 | * component. When JSONSL delivers a 'pop' callback for a string, or a 'push'
|
---|
| 672 | * callback for an object, we will check to see whether the index matching
|
---|
| 673 | * the component corresponding to the current level contains a match
|
---|
| 674 | * for our path.
|
---|
| 675 | *
|
---|
| 676 | * In order to do this properly, a structure must be maintained within the
|
---|
| 677 | * parent indicating whether its children are possible matches. This flag
|
---|
| 678 | * will be 'inherited' by call children which may conform to the match
|
---|
| 679 | * specification, and discarded by all which do not (thereby eliminating
|
---|
| 680 | * their children from inheriting it).
|
---|
| 681 | *
|
---|
| 682 | * A successful match is a complete one. One can provide multiple paths with
|
---|
| 683 | * multiple levels of matches e.g.
|
---|
| 684 | * /foo/bar/baz/^/blah
|
---|
| 685 | *
|
---|
| 686 | * @{
|
---|
| 687 | */
|
---|
| 688 |
|
---|
| 689 | /** The wildcard character */
|
---|
| 690 | #ifndef JSONSL_PATH_WILDCARD_CHAR
|
---|
| 691 | #define JSONSL_PATH_WILDCARD_CHAR '^'
|
---|
| 692 | #endif /* WILDCARD_CHAR */
|
---|
| 693 |
|
---|
| 694 | #define JSONSL_XMATCH \
|
---|
| 695 | X(COMPLETE,1) \
|
---|
| 696 | X(POSSIBLE,0) \
|
---|
| 697 | X(NOMATCH,-1) \
|
---|
| 698 | X(TYPE_MISMATCH, -2)
|
---|
| 699 |
|
---|
| 700 | typedef enum {
|
---|
| 701 |
|
---|
| 702 | #define X(T,v) \
|
---|
| 703 | JSONSL_MATCH_##T = v,
|
---|
| 704 | JSONSL_XMATCH
|
---|
| 705 |
|
---|
| 706 | #undef X
|
---|
| 707 | JSONSL_MATCH_UNKNOWN
|
---|
| 708 | } jsonsl_jpr_match_t;
|
---|
| 709 |
|
---|
| 710 | typedef enum {
|
---|
| 711 | JSONSL_PATH_STRING = 1,
|
---|
| 712 | JSONSL_PATH_WILDCARD,
|
---|
| 713 | JSONSL_PATH_NUMERIC,
|
---|
| 714 | JSONSL_PATH_ROOT,
|
---|
| 715 |
|
---|
| 716 | /* Special */
|
---|
| 717 | JSONSL_PATH_INVALID = -1,
|
---|
| 718 | JSONSL_PATH_NONE = 0
|
---|
| 719 | } jsonsl_jpr_type_t;
|
---|
| 720 |
|
---|
| 721 | struct jsonsl_jpr_component_st {
|
---|
| 722 | /** The string the component points to */
|
---|
| 723 | char *pstr;
|
---|
| 724 | /** if this is a numeric type, the number is 'cached' here */
|
---|
| 725 | unsigned long idx;
|
---|
| 726 | /** The length of the string */
|
---|
| 727 | size_t len;
|
---|
| 728 | /** The type of component (NUMERIC or STRING) */
|
---|
| 729 | jsonsl_jpr_type_t ptype;
|
---|
| 730 |
|
---|
| 731 | /** Set this to true to enforce type checking between dict keys and array
|
---|
| 732 | * indices. jsonsl_jpr_match() will return TYPE_MISMATCH if it detects
|
---|
| 733 | * that an array index is actually a child of a dictionary. */
|
---|
| 734 | short is_arridx;
|
---|
| 735 | };
|
---|
| 736 |
|
---|
| 737 | struct jsonsl_jpr_st {
|
---|
| 738 | /** Path components */
|
---|
| 739 | struct jsonsl_jpr_component_st *components;
|
---|
| 740 | size_t ncomponents;
|
---|
| 741 |
|
---|
| 742 | /** Base of allocated string for components */
|
---|
| 743 | char *basestr;
|
---|
| 744 |
|
---|
| 745 | /** The original match string. Useful for returning to the user */
|
---|
| 746 | char *orig;
|
---|
| 747 | size_t norig;
|
---|
| 748 | };
|
---|
| 749 |
|
---|
| 750 |
|
---|
| 751 |
|
---|
| 752 | /**
|
---|
| 753 | * Create a new JPR object.
|
---|
| 754 | *
|
---|
| 755 | * @param path the JSONPointer path specification.
|
---|
| 756 | * @param errp a pointer to a jsonsl_error_t. If this function returns NULL,
|
---|
| 757 | * then more details will be in this variable.
|
---|
| 758 | *
|
---|
| 759 | * @return a new jsonsl_jpr_t object, or NULL on error.
|
---|
| 760 | */
|
---|
| 761 | JSONSL_API
|
---|
| 762 | jsonsl_jpr_t jsonsl_jpr_new(const char *path, jsonsl_error_t *errp);
|
---|
| 763 |
|
---|
| 764 | /**
|
---|
| 765 | * Destroy a JPR object
|
---|
| 766 | */
|
---|
| 767 | JSONSL_API
|
---|
| 768 | void jsonsl_jpr_destroy(jsonsl_jpr_t jpr);
|
---|
| 769 |
|
---|
| 770 | /**
|
---|
| 771 | * Match a JSON object against a type and specific level
|
---|
| 772 | *
|
---|
| 773 | * @param jpr the JPR object
|
---|
| 774 | * @param parent_type the type of the parent (should be T_LIST or T_OBJECT)
|
---|
| 775 | * @param parent_level the level of the parent
|
---|
| 776 | * @param key the 'key' of the child. If the parent is an array, this should be
|
---|
| 777 | * empty.
|
---|
| 778 | * @param nkey - the length of the key. If the parent is an array (T_LIST), then
|
---|
| 779 | * this should be the current index.
|
---|
| 780 | *
|
---|
| 781 | * NOTE: The key of the child means any kind of associative data related to the
|
---|
| 782 | * element. Thus: <<< { "foo" : [ >>,
|
---|
| 783 | * the opening array's key is "foo".
|
---|
| 784 | *
|
---|
| 785 | * @return a status constant. This indicates whether a match was excluded, possible,
|
---|
| 786 | * or successful.
|
---|
| 787 | */
|
---|
| 788 | JSONSL_API
|
---|
| 789 | jsonsl_jpr_match_t jsonsl_jpr_match(jsonsl_jpr_t jpr,
|
---|
| 790 | unsigned int parent_type,
|
---|
| 791 | unsigned int parent_level,
|
---|
| 792 | const char *key, size_t nkey);
|
---|
| 793 |
|
---|
| 794 |
|
---|
| 795 | /**
|
---|
| 796 | * Associate a set of JPR objects with a lexer instance.
|
---|
| 797 | * This should be called before the lexer has been fed any data (and
|
---|
| 798 | * behavior is undefined if you don't adhere to this).
|
---|
| 799 | *
|
---|
| 800 | * After using this function, you may subsequently call match_state() on
|
---|
| 801 | * given states (presumably from within the callbacks).
|
---|
| 802 | *
|
---|
| 803 | * Note that currently the first JPR is the quickest and comes
|
---|
| 804 | * pre-allocated with the state structure. Further JPR objects
|
---|
| 805 | * are chained.
|
---|
| 806 | *
|
---|
| 807 | * @param jsn The lexer
|
---|
| 808 | * @param jprs An array of jsonsl_jpr_t objects
|
---|
| 809 | * @param njprs How many elements in the jprs array.
|
---|
| 810 | */
|
---|
| 811 | JSONSL_API
|
---|
| 812 | void jsonsl_jpr_match_state_init(jsonsl_t jsn,
|
---|
| 813 | jsonsl_jpr_t *jprs,
|
---|
| 814 | size_t njprs);
|
---|
| 815 |
|
---|
| 816 | /**
|
---|
| 817 | * This follows the same semantics as the normal match,
|
---|
| 818 | * except we infer parent and type information from the relevant state objects.
|
---|
| 819 | * The match status (for all possible JPR objects) is set in the *out parameter.
|
---|
| 820 | *
|
---|
| 821 | * If a match has succeeded, then its JPR object will be returned. In all other
|
---|
| 822 | * instances, NULL is returned;
|
---|
| 823 | *
|
---|
| 824 | * @param jpr The jsonsl_jpr_t handle
|
---|
| 825 | * @param state The jsonsl_state_st which is a candidate
|
---|
| 826 | * @param key The hash key (if applicable, can be NULL if parent is list)
|
---|
| 827 | * @param nkey Length of hash key (if applicable, can be zero if parent is list)
|
---|
| 828 | * @param out A pointer to a jsonsl_jpr_match_t. This will be populated with
|
---|
| 829 | * the match result
|
---|
| 830 | *
|
---|
| 831 | * @return If a match was completed in full, then the JPR object containing
|
---|
| 832 | * the matching path will be returned. Otherwise, the return is NULL (note, this
|
---|
| 833 | * does not mean matching has failed, it can still be part of the match: check
|
---|
| 834 | * the out parameter).
|
---|
| 835 | */
|
---|
| 836 | JSONSL_API
|
---|
| 837 | jsonsl_jpr_t jsonsl_jpr_match_state(jsonsl_t jsn,
|
---|
| 838 | struct jsonsl_state_st *state,
|
---|
| 839 | const char *key,
|
---|
| 840 | size_t nkey,
|
---|
| 841 | jsonsl_jpr_match_t *out);
|
---|
| 842 |
|
---|
| 843 |
|
---|
| 844 | /**
|
---|
| 845 | * Cleanup any memory allocated and any states set by
|
---|
| 846 | * match_state_init() and match_state()
|
---|
| 847 | * @param jsn The lexer
|
---|
| 848 | */
|
---|
| 849 | JSONSL_API
|
---|
| 850 | void jsonsl_jpr_match_state_cleanup(jsonsl_t jsn);
|
---|
| 851 |
|
---|
| 852 | /**
|
---|
| 853 | * Return a string representation of the match result returned by match()
|
---|
| 854 | */
|
---|
| 855 | JSONSL_API
|
---|
| 856 | const char *jsonsl_strmatchtype(jsonsl_jpr_match_t match);
|
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| 857 |
|
---|
| 858 | /* @}*/
|
---|
| 859 |
|
---|
| 860 | /**
|
---|
| 861 | * Utility function to convert escape sequences into their original form.
|
---|
| 862 | *
|
---|
| 863 | * The decoders I've sampled do not seem to specify a standard behavior of what
|
---|
| 864 | * to escape/unescape.
|
---|
| 865 | *
|
---|
| 866 | * RFC 4627 Mandates only that the quoute, backslash, and ASCII control
|
---|
| 867 | * characters (0x00-0x1f) be escaped. It is often common for applications
|
---|
| 868 | * to escape a '/' - however this may also be desired behavior. the JSON
|
---|
| 869 | * spec is not clear on this, and therefore jsonsl leaves it up to you.
|
---|
| 870 | *
|
---|
| 871 | * @param in The input string.
|
---|
| 872 | * @param out An allocated output (should be the same size as in)
|
---|
| 873 | * @param len the size of the buffer
|
---|
| 874 | * @param toEscape - A sparse array of characters to unescape. Characters
|
---|
| 875 | * which are not present in this array, e.g. toEscape['c'] == 0 will be
|
---|
| 876 | * ignored and passed to the output in their original form.
|
---|
| 877 | * @param oflags If not null, and a \uXXXX escape expands to a non-ascii byte,
|
---|
| 878 | * then this variable will have the SPECIALf_NONASCII flag on.
|
---|
| 879 | *
|
---|
| 880 | * @param err A pointer to an error variable. If an error ocurrs, it will be
|
---|
| 881 | * set in this variable
|
---|
| 882 | * @param errat If not null and an error occurs, this will be set to point
|
---|
| 883 | * to the position within the string at which the offending character was
|
---|
| 884 | * encountered.
|
---|
| 885 | *
|
---|
| 886 | * @return The effective size of the output buffer.
|
---|
| 887 | */
|
---|
| 888 | JSONSL_API
|
---|
| 889 | size_t jsonsl_util_unescape_ex(const char *in,
|
---|
| 890 | char *out,
|
---|
| 891 | size_t len,
|
---|
| 892 | const int toEscape[128],
|
---|
| 893 | unsigned *oflags,
|
---|
| 894 | jsonsl_error_t *err,
|
---|
| 895 | const char **errat);
|
---|
| 896 |
|
---|
| 897 | /**
|
---|
| 898 | * Convenience macro to avoid passing too many parameters
|
---|
| 899 | */
|
---|
| 900 | #define jsonsl_util_unescape(in, out, len, toEscape, err) \
|
---|
| 901 | jsonsl_util_unescape_ex(in, out, len, toEscape, NULL, err, NULL)
|
---|
| 902 |
|
---|
| 903 | #endif /* JSONSL_NO_JPR */
|
---|
| 904 |
|
---|
| 905 | /**
|
---|
| 906 | * HERE BE CHARACTER TABLES!
|
---|
| 907 | */
|
---|
| 908 | #define JSONSL_CHARTABLE_string_nopass \
|
---|
| 909 | /* 0x00 */ 1 /* <NUL> */, /* 0x00 */ \
|
---|
| 910 | /* 0x01 */ 1 /* <SOH> */, /* 0x01 */ \
|
---|
| 911 | /* 0x02 */ 1 /* <STX> */, /* 0x02 */ \
|
---|
| 912 | /* 0x03 */ 1 /* <ETX> */, /* 0x03 */ \
|
---|
| 913 | /* 0x04 */ 1 /* <EOT> */, /* 0x04 */ \
|
---|
| 914 | /* 0x05 */ 1 /* <ENQ> */, /* 0x05 */ \
|
---|
| 915 | /* 0x06 */ 1 /* <ACK> */, /* 0x06 */ \
|
---|
| 916 | /* 0x07 */ 1 /* <BEL> */, /* 0x07 */ \
|
---|
| 917 | /* 0x08 */ 1 /* <BS> */, /* 0x08 */ \
|
---|
| 918 | /* 0x09 */ 1 /* <HT> */, /* 0x09 */ \
|
---|
| 919 | /* 0x0a */ 1 /* <LF> */, /* 0x0a */ \
|
---|
| 920 | /* 0x0b */ 1 /* <VT> */, /* 0x0b */ \
|
---|
| 921 | /* 0x0c */ 1 /* <FF> */, /* 0x0c */ \
|
---|
| 922 | /* 0x0d */ 1 /* <CR> */, /* 0x0d */ \
|
---|
| 923 | /* 0x0e */ 1 /* <SO> */, /* 0x0e */ \
|
---|
| 924 | /* 0x0f */ 1 /* <SI> */, /* 0x0f */ \
|
---|
| 925 | /* 0x10 */ 1 /* <DLE> */, /* 0x10 */ \
|
---|
| 926 | /* 0x11 */ 1 /* <DC1> */, /* 0x11 */ \
|
---|
| 927 | /* 0x12 */ 1 /* <DC2> */, /* 0x12 */ \
|
---|
| 928 | /* 0x13 */ 1 /* <DC3> */, /* 0x13 */ \
|
---|
| 929 | /* 0x14 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x21 */ \
|
---|
| 930 | /* 0x22 */ 1 /* <"> */, /* 0x22 */ \
|
---|
| 931 | /* 0x23 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x42 */ \
|
---|
| 932 | /* 0x43 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5b */ \
|
---|
| 933 | /* 0x5c */ 1 /* <\> */, /* 0x5c */ \
|
---|
| 934 | /* 0x5d */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x7c */ \
|
---|
| 935 | /* 0x7d */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x9c */ \
|
---|
| 936 | /* 0x9d */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xbc */ \
|
---|
| 937 | /* 0xbd */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xdc */ \
|
---|
| 938 | /* 0xdd */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xfc */ \
|
---|
| 939 | /* 0xfd */ 0,0 /* 0xfe */ \
|
---|
| 940 |
|
---|
| 941 |
|
---|
| 942 |
|
---|
| 943 | #ifdef __cplusplus
|
---|
| 944 | }
|
---|
| 945 | #endif /* __cplusplus */
|
---|
| 946 |
|
---|
| 947 | #endif /* JSONSL_H_ */
|
---|