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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPC_CORE_LIB_JSON_JSON_READER_H
#define GRPC_CORE_LIB_JSON_JSON_READER_H
#include <grpc/support/port_platform.h>
#include "src/core/lib/json/json_common.h"
typedef enum {
GRPC_JSON_STATE_OBJECT_KEY_BEGIN,
GRPC_JSON_STATE_OBJECT_KEY_STRING,
GRPC_JSON_STATE_OBJECT_KEY_END,
GRPC_JSON_STATE_VALUE_BEGIN,
GRPC_JSON_STATE_VALUE_STRING,
GRPC_JSON_STATE_STRING_ESCAPE,
GRPC_JSON_STATE_STRING_ESCAPE_U1,
GRPC_JSON_STATE_STRING_ESCAPE_U2,
GRPC_JSON_STATE_STRING_ESCAPE_U3,
GRPC_JSON_STATE_STRING_ESCAPE_U4,
GRPC_JSON_STATE_VALUE_NUMBER,
GRPC_JSON_STATE_VALUE_NUMBER_WITH_DECIMAL,
GRPC_JSON_STATE_VALUE_NUMBER_ZERO,
GRPC_JSON_STATE_VALUE_NUMBER_DOT,
GRPC_JSON_STATE_VALUE_NUMBER_E,
GRPC_JSON_STATE_VALUE_NUMBER_EPM,
GRPC_JSON_STATE_VALUE_TRUE_R,
GRPC_JSON_STATE_VALUE_TRUE_U,
GRPC_JSON_STATE_VALUE_TRUE_E,
GRPC_JSON_STATE_VALUE_FALSE_A,
GRPC_JSON_STATE_VALUE_FALSE_L,
GRPC_JSON_STATE_VALUE_FALSE_S,
GRPC_JSON_STATE_VALUE_FALSE_E,
GRPC_JSON_STATE_VALUE_NULL_U,
GRPC_JSON_STATE_VALUE_NULL_L1,
GRPC_JSON_STATE_VALUE_NULL_L2,
GRPC_JSON_STATE_VALUE_END,
GRPC_JSON_STATE_END
} grpc_json_reader_state;
enum {
/* The first non-unicode value is 0x110000. But let's pick
* a value high enough to start our error codes from. These
* values are safe to return from the read_char function.
*/
GRPC_JSON_READ_CHAR_EOF = 0x7ffffff0,
GRPC_JSON_READ_CHAR_EAGAIN,
GRPC_JSON_READ_CHAR_ERROR
};
struct grpc_json_reader;
typedef struct grpc_json_reader_vtable {
/* Clears your internal string scratchpad. */
void (*string_clear)(void* userdata);
/* Adds a char to the string scratchpad. */
void (*string_add_char)(void* userdata, uint32_t c);
/* Adds a utf32 char to the string scratchpad. */
void (*string_add_utf32)(void* userdata, uint32_t c);
/* Reads a character from your input. May be utf-8, 16 or 32. */
uint32_t (*read_char)(void* userdata);
/* Starts a container of type GRPC_JSON_ARRAY or GRPC_JSON_OBJECT. */
void (*container_begins)(void* userdata, grpc_json_type type);
/* Ends the current container. Must return the type of its parent. */
grpc_json_type (*container_ends)(void* userdata);
/* Your internal string scratchpad is an object's key. */
void (*set_key)(void* userdata);
/* Your internal string scratchpad is a string value. */
void (*set_string)(void* userdata);
/* Your internal string scratchpad is a numerical value. Return 1 if valid. */
int (*set_number)(void* userdata);
/* Sets the values true, false or null. */
void (*set_true)(void* userdata);
void (*set_false)(void* userdata);
void (*set_null)(void* userdata);
} grpc_json_reader_vtable;
typedef struct grpc_json_reader {
/* That structure is fully private, and initialized by grpc_json_reader_init.
* The definition is public so you can put it on your stack.
*/
void* userdata;
grpc_json_reader_vtable* vtable;
int depth;
int in_object;
int in_array;
int escaped_string_was_key;
int container_just_begun;
uint16_t unicode_char, unicode_high_surrogate;
grpc_json_reader_state state;
} grpc_json_reader;
/* The return type of the parser. */
typedef enum {
GRPC_JSON_DONE, /* The parser finished successfully. */
GRPC_JSON_EAGAIN, /* The parser yields to get more data. */
GRPC_JSON_READ_ERROR, /* The parser passes through a read error. */
GRPC_JSON_PARSE_ERROR, /* The parser found an error in the json stream. */
GRPC_JSON_INTERNAL_ERROR /* The parser got an internal error. */
} grpc_json_reader_status;
/* Call this function to start parsing the input. It will return the following:
* . GRPC_JSON_DONE if the input got eof, and the parsing finished
* successfully.
* . GRPC_JSON_EAGAIN if the read_char function returned again. Call the
* parser again as needed. It is okay to call the parser in polling mode,
* although a bit dull.
* . GRPC_JSON_READ_ERROR if the read_char function returned an error. The
* state isn't broken however, and the function can be called again if the
* error has been corrected. But please use the EAGAIN feature instead for
* consistency.
* . GRPC_JSON_PARSE_ERROR if the input was somehow invalid.
* . GRPC_JSON_INTERNAL_ERROR if the parser somehow ended into an invalid
* internal state.
*/
grpc_json_reader_status grpc_json_reader_run(grpc_json_reader* reader);
/* Call this function to initialize the reader structure. */
void grpc_json_reader_init(grpc_json_reader* reader,
grpc_json_reader_vtable* vtable, void* userdata);
/* You may call this from the read_char callback if you don't know where is the
* end of your input stream, and you'd like the json reader to hint you that it
* has completed reading its input, so you can return an EOF to it. Note that
* there might still be trailing whitespaces after that point.
*/
int grpc_json_reader_is_complete(grpc_json_reader* reader);
#endif /* GRPC_CORE_LIB_JSON_JSON_READER_H */
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