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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.
*
*/
/* The idea of the writer is basically symmetrical of the reader. While the
* reader emits various calls to your code, the writer takes basically the
* same calls and emit json out of it. It doesn't try to make any check on
* the order of the calls you do on it. Meaning you can theorically force
* it to generate invalid json.
*
* Also, unlike the reader, the writer expects UTF-8 encoded input strings.
* These strings will be UTF-8 validated, and any invalid character will
* cut the conversion short, before any invalid UTF-8 sequence, thus forming
* a valid UTF-8 string overall.
*/
#ifndef GRPC_CORE_LIB_JSON_JSON_WRITER_H
#define GRPC_CORE_LIB_JSON_JSON_WRITER_H
#include <stdlib.h>
#include "src/core/lib/json/json_common.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct grpc_json_writer_vtable {
/* Adds a character to the output stream. */
void (*output_char)(void *userdata, char);
/* Adds a zero-terminated string to the output stream. */
void (*output_string)(void *userdata, const char *str);
/* Adds a fixed-length string to the output stream. */
void (*output_string_with_len)(void *userdata, const char *str, size_t len);
} grpc_json_writer_vtable;
typedef struct grpc_json_writer {
void *userdata;
grpc_json_writer_vtable *vtable;
int indent;
int depth;
int container_empty;
int got_key;
} grpc_json_writer;
/* Call this to initialize your writer structure. The indent parameter is
* specifying the number of spaces to use for indenting the output. If you
* use indent=0, then the output will not have any newlines either, thus
* emitting a condensed json output.
*/
void grpc_json_writer_init(grpc_json_writer *writer, int indent,
grpc_json_writer_vtable *vtable, void *userdata);
/* Signals the beginning of a container. */
void grpc_json_writer_container_begins(grpc_json_writer *writer,
grpc_json_type type);
/* Signals the end of a container. */
void grpc_json_writer_container_ends(grpc_json_writer *writer,
grpc_json_type type);
/* Writes down an object key for the next value. */
void grpc_json_writer_object_key(grpc_json_writer *writer, const char *string);
/* Sets a raw value. Useful for numbers. */
void grpc_json_writer_value_raw(grpc_json_writer *writer, const char *string);
/* Sets a raw value with its length. Useful for values like true or false. */
void grpc_json_writer_value_raw_with_len(grpc_json_writer *writer,
const char *string, size_t len);
/* Sets a string value. It'll be escaped, and utf-8 validated. */
void grpc_json_writer_value_string(grpc_json_writer *writer,
const char *string);
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_LIB_JSON_JSON_WRITER_H */
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