232 lines
6.4 KiB
C++
232 lines
6.4 KiB
C++
#include "libwebsockets.h"
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struct lejp_ctx;
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(_x) (sizeof(_x) / sizeof(_x[0]))
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#endif
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#define LEJP_FLAG_WS_KEEP 64
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#define LEJP_FLAG_WS_COMMENTLINE 32
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enum lejp_states {
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LEJP_IDLE = 0,
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LEJP_MEMBERS = 1,
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LEJP_M_P = 2,
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LEJP_MP_STRING = LEJP_FLAG_WS_KEEP | 3,
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LEJP_MP_STRING_ESC = LEJP_FLAG_WS_KEEP | 4,
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LEJP_MP_STRING_ESC_U1 = LEJP_FLAG_WS_KEEP | 5,
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LEJP_MP_STRING_ESC_U2 = LEJP_FLAG_WS_KEEP | 6,
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LEJP_MP_STRING_ESC_U3 = LEJP_FLAG_WS_KEEP | 7,
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LEJP_MP_STRING_ESC_U4 = LEJP_FLAG_WS_KEEP | 8,
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LEJP_MP_DELIM = 9,
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LEJP_MP_VALUE = 10,
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LEJP_MP_VALUE_NUM_INT = LEJP_FLAG_WS_KEEP | 11,
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LEJP_MP_VALUE_NUM_EXP = LEJP_FLAG_WS_KEEP | 12,
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LEJP_MP_VALUE_TOK = LEJP_FLAG_WS_KEEP | 13,
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LEJP_MP_COMMA_OR_END = 14,
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LEJP_MP_ARRAY_END = 15,
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};
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enum lejp_reasons {
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LEJP_CONTINUE = -1,
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LEJP_REJECT_IDLE_NO_BRACE = -2,
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LEJP_REJECT_MEMBERS_NO_CLOSE = -3,
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LEJP_REJECT_MP_NO_OPEN_QUOTE = -4,
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LEJP_REJECT_MP_STRING_UNDERRUN = -5,
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LEJP_REJECT_MP_ILLEGAL_CTRL = -6,
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LEJP_REJECT_MP_STRING_ESC_ILLEGAL_ESC = -7,
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LEJP_REJECT_ILLEGAL_HEX = -8,
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LEJP_REJECT_MP_DELIM_MISSING_COLON = -9,
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LEJP_REJECT_MP_DELIM_BAD_VALUE_START = -10,
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LEJP_REJECT_MP_VAL_NUM_INT_NO_FRAC = -11,
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LEJP_REJECT_MP_VAL_NUM_FORMAT = -12,
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LEJP_REJECT_MP_VAL_NUM_EXP_BAD_EXP = -13,
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LEJP_REJECT_MP_VAL_TOK_UNKNOWN = -14,
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LEJP_REJECT_MP_C_OR_E_UNDERF = -15,
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LEJP_REJECT_MP_C_OR_E_NOTARRAY = -16,
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LEJP_REJECT_MP_ARRAY_END_MISSING = -17,
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LEJP_REJECT_STACK_OVERFLOW = -18,
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LEJP_REJECT_MP_DELIM_ISTACK = -19,
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LEJP_REJECT_NUM_TOO_LONG = -20,
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LEJP_REJECT_MP_C_OR_E_NEITHER = -21,
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LEJP_REJECT_UNKNOWN = -22,
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LEJP_REJECT_CALLBACK = -23
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};
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#define LEJP_FLAG_CB_IS_VALUE 64
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enum lejp_callbacks {
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LEJPCB_CONSTRUCTED = 0,
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LEJPCB_DESTRUCTED = 1,
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LEJPCB_START = 2,
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LEJPCB_COMPLETE = 3,
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LEJPCB_FAILED = 4,
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LEJPCB_PAIR_NAME = 5,
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LEJPCB_VAL_TRUE = LEJP_FLAG_CB_IS_VALUE | 6,
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LEJPCB_VAL_FALSE = LEJP_FLAG_CB_IS_VALUE | 7,
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LEJPCB_VAL_NULL = LEJP_FLAG_CB_IS_VALUE | 8,
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LEJPCB_VAL_NUM_INT = LEJP_FLAG_CB_IS_VALUE | 9,
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LEJPCB_VAL_NUM_FLOAT = LEJP_FLAG_CB_IS_VALUE | 10,
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LEJPCB_VAL_STR_START = 11, /* notice handle separately */
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LEJPCB_VAL_STR_CHUNK = LEJP_FLAG_CB_IS_VALUE | 12,
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LEJPCB_VAL_STR_END = LEJP_FLAG_CB_IS_VALUE | 13,
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LEJPCB_ARRAY_START = 14,
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LEJPCB_ARRAY_END = 15,
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LEJPCB_OBJECT_START = 16,
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LEJPCB_OBJECT_END = 17
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};
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/**
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* _lejp_callback() - User parser actions
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* \param ctx: LEJP context
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* \param reason: Callback reason
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*
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* Your user callback is associated with the context at construction time,
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* and receives calls as the parsing progresses.
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*
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* All of the callbacks may be ignored and just return 0.
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*
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* The reasons it might get called, found in @reason, are:
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*
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* LEJPCB_CONSTRUCTED: The context was just constructed... you might want to
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* perform one-time allocation for the life of the context.
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*
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* LEJPCB_DESTRUCTED: The context is being destructed... if you made any
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* allocations at construction-time, you can free them now
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*
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* LEJPCB_START: Parsing is beginning at the first byte of input
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*
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* LEJPCB_COMPLETE: Parsing has completed successfully. You'll get a 0 or
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* positive return code from lejp_parse indicating the
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* amount of unused bytes left in the input buffer
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*
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* LEJPCB_FAILED: Parsing failed. You'll get a negative error code
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* returned from lejp_parse
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*
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* LEJPCB_PAIR_NAME: When a "name":"value" pair has had the name parsed,
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* this callback occurs. You can find the new name at
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* the end of ctx->path[]
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*
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* LEJPCB_VAL_TRUE: The "true" value appeared
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*
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* LEJPCB_VAL_FALSE: The "false" value appeared
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*
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* LEJPCB_VAL_NULL: The "null" value appeared
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*
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* LEJPCB_VAL_NUM_INT: A string representing an integer is in ctx->buf
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*
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* LEJPCB_VAL_NUM_FLOAT: A string representing a float is in ctx->buf
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*
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* LEJPCB_VAL_STR_START: We are starting to parse a string, no data yet
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*
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* LEJPCB_VAL_STR_CHUNK: We parsed LEJP_STRING_CHUNK -1 bytes of string data in
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* ctx->buf, which is as much as we can buffer, so we are
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* spilling it. If all your strings are less than
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* LEJP_STRING_CHUNK - 1 bytes, you will never see this
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* callback.
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*
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* LEJPCB_VAL_STR_END: String parsing has completed, the last chunk of the
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* string is in ctx->buf.
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*
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* LEJPCB_ARRAY_START: An array started
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*
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* LEJPCB_ARRAY_END: An array ended
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*
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* LEJPCB_OBJECT_START: An object started
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*
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* LEJPCB_OBJECT_END: An object ended
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*/
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LWS_EXTERN signed char _lejp_callback(struct lejp_ctx *ctx, char reason);
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typedef signed char (*lejp_callback)(struct lejp_ctx *ctx, char reason);
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#ifndef LEJP_MAX_DEPTH
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#define LEJP_MAX_DEPTH 12
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#endif
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#ifndef LEJP_MAX_INDEX_DEPTH
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#define LEJP_MAX_INDEX_DEPTH 5
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#endif
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#ifndef LEJP_MAX_PATH
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#define LEJP_MAX_PATH 128
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#endif
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#ifndef LEJP_STRING_CHUNK
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/* must be >= 30 to assemble floats */
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#define LEJP_STRING_CHUNK 255
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#endif
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enum num_flags {
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LEJP_SEEN_MINUS = (1 << 0),
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LEJP_SEEN_POINT = (1 << 1),
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LEJP_SEEN_POST_POINT = (1 << 2),
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LEJP_SEEN_EXP = (1 << 3)
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};
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struct _lejp_stack {
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char s; /* lejp_state stack*/
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char p; /* path length */
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char i; /* index array length */
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char b; /* user bitfield */
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};
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struct lejp_ctx {
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/* sorted by type for most compact alignment
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*
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* pointers
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*/
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signed char (*callback)(struct lejp_ctx *ctx, char reason);
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void *user;
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const char * const *paths;
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/* arrays */
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struct _lejp_stack st[LEJP_MAX_DEPTH];
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unsigned short i[LEJP_MAX_INDEX_DEPTH]; /* index array */
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unsigned short wild[LEJP_MAX_INDEX_DEPTH]; /* index array */
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char path[LEJP_MAX_PATH];
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char buf[LEJP_STRING_CHUNK];
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/* int */
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unsigned int line;
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/* short */
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unsigned short uni;
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/* char */
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unsigned char npos;
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unsigned char dcount;
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unsigned char f;
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unsigned char sp; /* stack head */
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unsigned char ipos; /* index stack depth */
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unsigned char ppos;
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unsigned char count_paths;
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unsigned char path_match;
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unsigned char path_match_len;
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unsigned char wildcount;
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};
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LWS_VISIBLE LWS_EXTERN void
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lejp_construct(struct lejp_ctx *ctx,
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signed char (*callback)(struct lejp_ctx *ctx, char reason),
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void *user, const char * const *paths, unsigned char paths_count);
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LWS_VISIBLE LWS_EXTERN void
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lejp_destruct(struct lejp_ctx *ctx);
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LWS_VISIBLE LWS_EXTERN int
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lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len);
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LWS_VISIBLE LWS_EXTERN void
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lejp_change_callback(struct lejp_ctx *ctx,
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signed char (*callback)(struct lejp_ctx *ctx, char reason));
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LWS_VISIBLE LWS_EXTERN int
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lejp_get_wildcard(struct lejp_ctx *ctx, int wildcard, char *dest, int len);
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