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Utilities: Add jq-like json query functionality to jp

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Maxwell Trussell 2022-10-12 12:42:05 -07:00 • committed by Linus Groh
parent d80472b8f4
commit 424033be44
1 changed files with 42 additions and 0 deletions
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42
Userland/Utilities/jp.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Maxwell Trussell <maxtrussell@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -9,12 +10,16 @@
#include <AK/JsonObject.h>
#include <AK/JsonValue.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <unistd.h>
static JsonValue query(JsonValue const& value, Vector<StringView>& key_parts, size_t key_index = 0);
static void print(JsonValue const& value, int spaces_per_indent, int indent = 0, bool use_color = true);
static void print_indent(int indent, int spaces_per_indent)
{
@ -27,10 +32,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TRY(Core::System::pledge("stdio rpath"));
StringView path;
StringView dotted_key;
int spaces_in_indent = 4;
Core::ArgsParser args_parser;
args_parser.set_general_help("Pretty-print a JSON file with syntax-coloring and indentation.");
args_parser.add_option(dotted_key, "Dotted query key", "query", 'q', "foo.*.bar");
args_parser.add_option(spaces_in_indent, "Indent size", "indent-size", 'i', "spaces_in_indent");
args_parser.add_positional_argument(path, "Path to JSON file", "path", Core::ArgsParser::Required::No);
VERIFY(spaces_in_indent >= 0);
@ -46,6 +53,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
auto file_contents = file->read_all();
auto json = TRY(JsonValue::from_string(file_contents));
if (!dotted_key.is_empty()) {
auto key_parts = dotted_key.split_view('.');
json = query(json, key_parts);
}
print(json, spaces_in_indent, 0, isatty(STDOUT_FILENO));
outln();
@ -109,3 +120,34 @@ void print(JsonValue const& value, int spaces_per_indent, int indent, bool use_c
if (use_color)
out("\033[0m");
}
JsonValue query(JsonValue const& value, Vector<StringView>& key_parts, size_t key_index)
{
if (key_index == key_parts.size())
return value;
auto key = key_parts[key_index++];
if (key == "*"sv) {
Vector<JsonValue> matches;
if (value.is_object()) {
value.as_object().for_each_member([&](auto&, auto& member_value) {
matches.append(query(member_value, key_parts, key_index));
});
} else if (value.is_array()) {
value.as_array().for_each([&](auto& member) {
matches.append(query(member, key_parts, key_index));
});
}
return JsonValue(JsonArray(matches));
}
JsonValue result {};
if (value.is_object()) {
result = value.as_object().get(key);
} else if (value.is_array()) {
auto key_as_index = key.to_int();
if (key_as_index.has_value())
result = value.as_array().at(key_as_index.value());
}
return query(result, key_parts, key_index);
}