jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * Copyright (c) 2022, Maxwell Trussell <maxtrussell@gmail.com>
4 *
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8#include <AK/Assertions.h>
9#include <AK/JsonArray.h>
10#include <AK/JsonObject.h>
11#include <AK/JsonValue.h>
12#include <AK/StringBuilder.h>
13#include <AK/StringView.h>
14#include <AK/Types.h>
15#include <AK/Vector.h>
16#include <LibCore/ArgsParser.h>
17#include <LibCore/File.h>
18#include <LibCore/System.h>
19#include <LibMain/Main.h>
20#include <unistd.h>
21
22static JsonValue query(JsonValue const& value, Vector<StringView>& key_parts, size_t key_index = 0);
23static void print(JsonValue const& value, int spaces_per_indent, int indent = 0, bool use_color = true);
24static void print_indent(int indent, int spaces_per_indent)
25{
26 for (int i = 0; i < indent * spaces_per_indent; ++i)
27 out(" ");
28}
29
30ErrorOr<int> serenity_main(Main::Arguments arguments)
31{
32 TRY(Core::System::pledge("stdio rpath"));
33
34 StringView path;
35 StringView dotted_key;
36 int spaces_in_indent = 4;
37
38 Core::ArgsParser args_parser;
39 args_parser.set_general_help("Pretty-print a JSON file with syntax-coloring and indentation.");
40 args_parser.add_option(dotted_key, "Dotted query key", "query", 'q', "foo.*.bar");
41 args_parser.add_option(spaces_in_indent, "Indent size", "indent-size", 'i', "spaces_in_indent");
42 args_parser.add_positional_argument(path, "Path to JSON file", "path", Core::ArgsParser::Required::No);
43 VERIFY(spaces_in_indent >= 0);
44 args_parser.parse(arguments);
45
46 auto file = TRY(Core::File::open_file_or_standard_stream(path, Core::File::OpenMode::Read));
47
48 TRY(Core::System::pledge("stdio"));
49
50 auto file_contents = TRY(file->read_until_eof());
51 auto json = TRY(JsonValue::from_string(file_contents));
52 if (!dotted_key.is_empty()) {
53 auto key_parts = dotted_key.split_view('.');
54 json = query(json, key_parts);
55 }
56
57 print(json, spaces_in_indent, 0, isatty(STDOUT_FILENO));
58 outln();
59
60 return 0;
61}
62
63void print(JsonValue const& value, int spaces_per_indent, int indent, bool use_color)
64{
65 if (value.is_object()) {
66 size_t printed_members = 0;
67 auto& object = value.as_object();
68 outln("{{");
69 object.for_each_member([&](auto& member_name, auto& member_value) {
70 ++printed_members;
71 print_indent(indent + 1, spaces_per_indent);
72 if (use_color)
73 out("\"\033[33;1m{}\033[0m\": ", member_name);
74 else
75 out("\"{}\": ", member_name);
76 print(member_value, spaces_per_indent, indent + 1, use_color);
77 if (printed_members < static_cast<size_t>(object.size()))
78 out(",");
79 outln();
80 });
81 print_indent(indent, spaces_per_indent);
82 out("}}");
83 return;
84 }
85 if (value.is_array()) {
86 size_t printed_entries = 0;
87 auto array = value.as_array();
88 outln("[");
89 array.for_each([&](auto& entry_value) {
90 ++printed_entries;
91 print_indent(indent + 1, spaces_per_indent);
92 print(entry_value, spaces_per_indent, indent + 1, use_color);
93 if (printed_entries < static_cast<size_t>(array.size()))
94 out(",");
95 outln();
96 });
97 print_indent(indent, spaces_per_indent);
98 out("]");
99 return;
100 }
101 if (use_color) {
102 if (value.is_string())
103 out("\033[31;1m");
104 else if (value.is_number())
105 out("\033[35;1m");
106 else if (value.is_bool())
107 out("\033[32;1m");
108 else if (value.is_null())
109 out("\033[34;1m");
110 }
111 if (value.is_string())
112 out("\"");
113 out("{}", value.to_deprecated_string());
114 if (value.is_string())
115 out("\"");
116 if (use_color)
117 out("\033[0m");
118}
119
120JsonValue query(JsonValue const& value, Vector<StringView>& key_parts, size_t key_index)
121{
122 if (key_index == key_parts.size())
123 return value;
124 auto key = key_parts[key_index++];
125
126 if (key == "*"sv) {
127 Vector<JsonValue> matches;
128 if (value.is_object()) {
129 value.as_object().for_each_member([&](auto&, auto& member_value) {
130 matches.append(query(member_value, key_parts, key_index));
131 });
132 } else if (value.is_array()) {
133 value.as_array().for_each([&](auto& member) {
134 matches.append(query(member, key_parts, key_index));
135 });
136 }
137 return JsonValue(JsonArray(matches));
138 }
139
140 JsonValue result {};
141 if (value.is_object()) {
142 result = value.as_object().get(key).value_or({});
143 } else if (value.is_array()) {
144 auto key_as_index = key.to_int();
145 if (key_as_index.has_value())
146 result = value.as_array().at(key_as_index.value());
147 }
148 return query(result, key_parts, key_index);
149}