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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* 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"
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);
#endif /* GRPC_CORE_LIB_JSON_JSON_WRITER_H */
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