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gron: Implement a simplified variant of @tomnomnom's "gron"

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This program takes JSON input and turns it into JavaScript statements
that construct the same data step by step. This format is much more
greppable than what "jp" gives us. :^)
This commit is contained in:
Andreas Kling 2019-12-27 03:22:09 +01:00
parent 49a789ad04
commit d1c16944ce
1 changed files with 93 additions and 0 deletions
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Userland/gron.cpp Normal file
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#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonValue.h>
#include <AK/StringBuilder.h>
#include <LibCore/CFile.h>
#include <stdio.h>
static bool use_color = false;
static void print(const String& name, const JsonValue&, Vector<String>& trail);
static const char* color_name = "";
static const char* color_index = "";
static const char* color_brace = "";
static const char* color_bool = "";
static const char* color_null = "";
static const char* color_string = "";
static const char* color_off = "";
int main(int argc, char** argv)
{
if (argc != 2) {
fprintf(stderr, "usage: gron <file>\n");
return 0;
}
auto file = CFile::construct(argv[1]);
if (!file->open(CIODevice::ReadOnly)) {
fprintf(stderr, "Couldn't open %s for reading: %s\n", argv[1], file->error_string());
return 1;
}
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents);
if (isatty(STDOUT_FILENO))
use_color = true;
if (use_color) {
color_name = "\033[33;1m";
color_index = "\033[35;1m";
color_brace = "\033[36m";
color_bool = "\033[32;1m";
color_string = "\033[31;1m";
color_null = "\033[34;1m";
color_off = "\033[0m";
}
Vector<String> trail;
print("json", json, trail);
return 0;
}
static void print(const String& name, const JsonValue& value, Vector<String>& trail)
{
for (int i = 0; i < trail.size(); ++i)
printf("%s", trail[i].characters());
printf("%s%s%s = ", color_name, name.characters(), color_off);
if (value.is_object()) {
printf("%s{}%s;\n", color_brace, color_off);
trail.append(String::format("%s%s%s.", color_name, name.characters(), color_off));
value.as_object().for_each_member([&](auto& on, auto& ov) { print(on, ov, trail); });
trail.take_last();
return;
}
if (value.is_array()) {
printf("%s[]%s;\n", color_brace, color_off);
trail.append(String::format("%s%s%s", color_name, name.characters(), color_off));
for (int i = 0; i < value.as_array().size(); ++i) {
auto element_name = String::format("%s%s[%s%s%d%s%s]%s", color_off, color_brace, color_off, color_index, i, color_off, color_brace, color_off);
print(element_name, value.as_array()[i], trail);
}
trail.take_last();
return;
}
switch (value.type()) {
case JsonValue::Type::Null:
case JsonValue::Type::Undefined:
printf("%s", color_null);
break;
case JsonValue::Type::Bool:
printf("%s", color_bool);
break;
case JsonValue::Type::String:
printf("%s", color_string);
break;
default:
printf("%s", color_index);
break;
}
printf("%s%s;\n", value.serialized<StringBuilder>().characters(), color_off);
}