Metall v0.30
A persistent memory allocator for data-centric analytics
 
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pretty_print.hpp
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1// Copyright 2021 Lawrence Livermore National Security, LLC and other Metall
2// Project Developers. See the top-level COPYRIGHT file for details.
3//
4// SPDX-License-Identifier: (Apache-2.0 OR MIT)
5
6#ifndef METALL_JSON_PRETTY_PRINT_HPP
7#define METALL_JSON_PRETTY_PRINT_HPP
8
9#include <iostream>
10
11#include <metall/json/json_fwd.hpp>
12
13namespace metall::json::jsndtl {
14template <typename allocator_type, int indent_size>
15inline void pretty_print_impl(std::ostream &os, const value<allocator_type> &jv,
16 const std::string &indent) {
17 if (jv.is_bool()) {
18 os << std::boolalpha << jv.as_bool();
19 } else if (jv.is_int64()) {
20 os << jv.as_int64();
21 } else if (jv.is_uint64()) {
22 os << jv.as_uint64();
23 } else if (jv.is_double()) {
24 os << jv.as_double();
25 } else if (jv.is_string()) {
26 os << json::serialize(jv.as_string());
27 } else if (jv.is_array()) {
28 os << "[\n";
29 const auto &arr = jv.as_array();
30 std::string new_indent = indent;
31 new_indent.append(indent_size, ' ');
32 for (std::size_t i = 0; i < arr.size(); ++i) {
33 os << new_indent;
34 pretty_print_impl<allocator_type, indent_size>(os, arr[i], new_indent);
35 if (i < arr.size() - 1) {
36 os << ",\n";
37 }
38 }
39 os << "\n" << indent << "]";
40 } else if (jv.is_object()) {
41 os << "{\n";
42 const auto &obj = jv.as_object();
43 std::string new_indent = indent;
44 new_indent.append(indent_size, ' ');
45 for (auto it = obj.begin();;) {
46 os << new_indent << it->key() << " : ";
47 pretty_print_impl<allocator_type, indent_size>(os, it->value(),
48 new_indent);
49 if (++it == obj.end()) {
50 break;
51 }
52 os << ",\n";
53 }
54 os << "\n" << indent << "}";
55
56 } else if (jv.is_null()) {
57 os << "null";
58 }
59}
60
61} // namespace metall::json::jsndtl
62
63namespace metall::json {
64
70#ifdef DOXYGEN_SKIP
71template <typename allocator_type, int indent_size = 2>
72#else
73template <typename allocator_type, int indent_size>
74#endif
75inline void pretty_print(std::ostream &os,
76 const value<allocator_type> &json_value) {
77 std::string indent;
78 jsndtl::pretty_print_impl<allocator_type, indent_size>(os, json_value,
79 indent);
80 os << std::endl;
81}
82
83} // namespace metall::json
84
85#endif // METALL_JSON_PRETTY_PRINT_HPP
metall::json::value
JSON value. A container that holds a single bool, int64, uint64, double, JSON string,...
Definition value.hpp:82
metall::json::value::as_array
array_type & as_array()
Return a reference to the underlying array, or throw an exception.
Definition value.hpp:458
metall::json::value::is_null
bool is_null() const noexcept
Return true if this is a null.
Definition value.hpp:472
metall::json::value::as_object
object_type & as_object()
Return a reference to the underlying object, or throw an exception.
Definition value.hpp:465
metall::json::value::is_string
bool is_string() const noexcept
Return true if this is a string.
Definition value.hpp:495
metall::json::value::is_int64
bool is_int64() const noexcept
Return true if this is a int64.
Definition value.hpp:480
metall::json::value::as_bool
bool & as_bool()
Return a reference to the underlying bool, or throw an exception.
Definition value.hpp:417
metall::json::value::is_uint64
bool is_uint64() const noexcept
Return true if this is a uint64.
Definition value.hpp:485
metall::json::value::is_bool
bool is_bool() const noexcept
Return true if this is a bool.
Definition value.hpp:477
metall::json::value::is_object
bool is_object() const noexcept
Return true if this is a object.
Definition value.hpp:505
metall::json::value::is_array
bool is_array() const noexcept
Return true if this is an array.
Definition value.hpp:500
metall::json::value::as_uint64
std::uint64_t & as_uint64()
Return a reference to the underlying std::uint64_t, or throw an exception.
Definition value.hpp:435
metall::json::value::as_string
string_type & as_string()
Return a reference to the underlying string, or throw an exception.
Definition value.hpp:451
metall::json::value::is_double
bool is_double() const noexcept
Return true if this is a double.
Definition value.hpp:490
metall::json::value::as_int64
std::int64_t & as_int64()
Return a reference to the underlying std::int64_t, or throw an exception.
Definition value.hpp:425
metall::json::value::as_double
double & as_double()
Return a reference to the underlying double, or throw an exception.
Definition value.hpp:444
json_fwd.hpp
metall::json::jsndtl
Definition array.hpp:23
metall::json::jsndtl::pretty_print_impl
void pretty_print_impl(std::ostream &os, const value< allocator_type > &jv, const std::string &indent)
Definition pretty_print.hpp:15
metall::json
Namespace for Metall JSON container, which is in an experimental phase.
Definition array.hpp:17
metall::json::serialize
std::string serialize(const value< allocator_type > &input)
Definition serialize.hpp:22
metall::json::pretty_print
void pretty_print(std::ostream &os, const value< allocator_type > &json_value)
Pretty-prints a JSON value.
Definition pretty_print.hpp:75