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Diffstat (limited to 'src/core/json/json_reader.h')
| -rw-r--r-- | src/core/json/json_reader.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/core/json/json_reader.h b/src/core/json/json_reader.h new file mode 100644 index 0000000000..d71f0b8e66 --- /dev/null +++ b/src/core/json/json_reader.h @@ -0,0 +1,158 @@ +/* + * + * Copyright 2014, 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. + * + */ + +#ifndef __GRPC_SRC_CORE_JSON_JSON_READER_H__ +#define __GRPC_SRC_CORE_JSON_JSON_READER_H__ + +#include <grpc/support/port_platform.h> +#include "src/core/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 +}; + +typedef struct grpc_json_reader { + /* You are responsible for your own opaque userdata. + * Among other things, it needs to hold a string scratchpad. + */ + void* userdata; + + /* You also need to set up these callbacks. */ + + /* Clears your internal string scratchpad. */ + void (*string_clear)(struct grpc_json_reader*); + /* Adds a char to the string scratchpad. */ + void (*string_add_char)(struct grpc_json_reader*, gpr_uint32 c); + /* Adds a utf32 char to the string scratchpad. */ + void (*string_add_utf32)(struct grpc_json_reader*, gpr_uint32 c); + /* Reads a character from your input. May be utf-8, 16 or 32. */ + gpr_uint32 (*read_char)(struct grpc_json_reader*); + /* Starts a container of type GRPC_JSON_ARRAY or GRPC_JSON_OBJECT. */ + void (*container_begins)(struct grpc_json_reader*, grpc_json_type type); + /* Ends the current container. Must return the type of its parent. */ + grpc_json_type (*container_ends)(struct grpc_json_reader*); + /* Your internal string scratchpad is an object's key. */ + void (*set_key)(struct grpc_json_reader*); + /* Your internal string scratchpad is a string value. */ + void (*set_string)(struct grpc_json_reader*); + /* Your internal string scratchpad is a numerical value. Return 1 if valid. */ + int (*set_number)(struct grpc_json_reader*); + /* Sets the values true, false or null. */ + void (*set_true)(struct grpc_json_reader*); + void (*set_false)(struct grpc_json_reader*); + void (*set_null)(struct grpc_json_reader*); + + /* Everything down here is private, + and initialized by grpc_json_reader_init. */ + int depth; + int in_object; + int in_array; + int escaped_string_was_key; + int container_just_begun; + gpr_uint16 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_ret; + +/* 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_ret 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); + +/* 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_SRC_CORE_JSON_JSON_READER_H__ */ |