199 lines
6.1 KiB
C++
199 lines
6.1 KiB
C++
/*
|
|
* Copyright 2011-present Facebook, Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/**
|
|
*
|
|
* Serialize and deserialize folly::dynamic values as JSON.
|
|
*
|
|
* Before you use this you should probably understand the basic
|
|
* concepts in the JSON type system:
|
|
*
|
|
* Value : String | Bool | Null | Object | Array | Number
|
|
* String : UTF-8 sequence
|
|
* Object : (String, Value) pairs, with unique String keys
|
|
* Array : ordered list of Values
|
|
* Null : null
|
|
* Bool : true | false
|
|
* Number : (representation unspecified)
|
|
*
|
|
* ... That's about it. For more information see http://json.org or
|
|
* look up RFC 4627.
|
|
*
|
|
* If your dynamic has anything illegal with regard to this type
|
|
* system, the serializer will throw.
|
|
*
|
|
* @author Jordan DeLong <delong.j@fb.com>
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <iosfwd>
|
|
#include <string>
|
|
|
|
#include <folly/Function.h>
|
|
#include <folly/Range.h>
|
|
#include <folly/dynamic.h>
|
|
|
|
namespace folly {
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
namespace json {
|
|
|
|
struct serialization_opts {
|
|
explicit serialization_opts()
|
|
: allow_non_string_keys(false),
|
|
javascript_safe(false),
|
|
pretty_formatting(false),
|
|
encode_non_ascii(false),
|
|
validate_utf8(false),
|
|
allow_trailing_comma(false),
|
|
sort_keys(false),
|
|
skip_invalid_utf8(false),
|
|
allow_nan_inf(false),
|
|
double_mode(double_conversion::DoubleToStringConverter::SHORTEST),
|
|
double_num_digits(0), // ignored when mode is SHORTEST
|
|
double_fallback(false),
|
|
parse_numbers_as_strings(false),
|
|
recursion_limit(100),
|
|
extra_ascii_to_escape_bitmap{{0, 0}} {}
|
|
|
|
// If true, keys in an object can be non-strings. (In strict
|
|
// JSON, object keys must be strings.) This is used by dynamic's
|
|
// operator<<.
|
|
bool allow_non_string_keys;
|
|
|
|
/*
|
|
* If true, refuse to serialize 64-bit numbers that cannot be
|
|
* precisely represented by fit a double---instead, throws an
|
|
* exception if the document contains this.
|
|
*/
|
|
bool javascript_safe;
|
|
|
|
// If true, the serialized json will contain space and newlines to
|
|
// try to be minimally "pretty".
|
|
bool pretty_formatting;
|
|
|
|
// If true, non-ASCII utf8 characters would be encoded as \uXXXX:
|
|
// - if the code point is in [U+0000..U+FFFF] => encode as a single \uXXXX
|
|
// - if the code point is > U+FFFF => encode as 2 UTF-16 surrogate pairs.
|
|
bool encode_non_ascii;
|
|
|
|
// Check that strings are valid utf8
|
|
bool validate_utf8;
|
|
|
|
// Allow trailing comma in lists of values / items
|
|
bool allow_trailing_comma;
|
|
|
|
// Sort keys of all objects before printing out (potentially slow)
|
|
// using dynamic::operator<.
|
|
// Has no effect if sort_keys_by is set.
|
|
bool sort_keys;
|
|
|
|
// Sort keys of all objects before printing out (potentially slow)
|
|
// using the provided less functor.
|
|
Function<bool(dynamic const&, dynamic const&) const> sort_keys_by;
|
|
|
|
// Replace invalid utf8 characters with U+FFFD and continue
|
|
bool skip_invalid_utf8;
|
|
|
|
// true to allow NaN or INF values
|
|
bool allow_nan_inf;
|
|
|
|
// Options for how to print floating point values. See Conv.h
|
|
// toAppend implementation for floating point for more info
|
|
double_conversion::DoubleToStringConverter::DtoaMode double_mode;
|
|
unsigned int double_num_digits;
|
|
|
|
// Fallback to double when a value that looks like integer is too big to
|
|
// fit in an int64_t. Can result in loss a of precision.
|
|
bool double_fallback;
|
|
|
|
// Do not parse numbers. Instead, store them as strings and leave the
|
|
// conversion up to the user.
|
|
bool parse_numbers_as_strings;
|
|
|
|
// Recursion limit when parsing.
|
|
unsigned int recursion_limit;
|
|
|
|
// Bitmap representing ASCII characters to escape with unicode
|
|
// representations. The least significant bit of the first in the pair is
|
|
// ASCII value 0; the most significant bit of the second in the pair is ASCII
|
|
// value 127. Some specific characters in this range are always escaped
|
|
// regardless of the bitmask - namely characters less than 0x20, \, and ".
|
|
std::array<uint64_t, 2> extra_ascii_to_escape_bitmap;
|
|
};
|
|
|
|
/*
|
|
* Generates a bitmap with bits set for each of the ASCII characters provided
|
|
* for use in the serialization_opts extra_ascii_to_escape_bitmap option. If any
|
|
* characters are not valid ASCII, they are ignored.
|
|
*/
|
|
std::array<uint64_t, 2> buildExtraAsciiToEscapeBitmap(StringPiece chars);
|
|
|
|
/*
|
|
* Main JSON serialization routine taking folly::dynamic parameters.
|
|
* For the most common use cases there are simpler functions in the
|
|
* main folly namespace below.
|
|
*/
|
|
std::string serialize(dynamic const&, serialization_opts const&);
|
|
|
|
/*
|
|
* Escape a string so that it is legal to print it in JSON text and
|
|
* append the result to out.
|
|
*/
|
|
|
|
void escapeString(
|
|
StringPiece input,
|
|
std::string& out,
|
|
const serialization_opts& opts);
|
|
|
|
/*
|
|
* Strip all C99-like comments (i.e. // and / * ... * /)
|
|
*/
|
|
std::string stripComments(StringPiece jsonC);
|
|
|
|
} // namespace json
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
/*
|
|
* Parse a json blob out of a range and produce a dynamic representing
|
|
* it.
|
|
*/
|
|
dynamic parseJson(StringPiece, json::serialization_opts const&);
|
|
dynamic parseJson(StringPiece);
|
|
|
|
/*
|
|
* Serialize a dynamic into a json string.
|
|
*/
|
|
std::string toJson(dynamic const&);
|
|
|
|
/*
|
|
* Same as the above, except format the json with some minimal
|
|
* indentation.
|
|
*/
|
|
std::string toPrettyJson(dynamic const&);
|
|
|
|
/*
|
|
* Printer for GTest.
|
|
* Uppercase name to fill GTest's API, which calls this method through ADL.
|
|
*/
|
|
void PrintTo(const dynamic&, std::ostream*);
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
} // namespace folly
|