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use serde_json::Value;
use std::mem::discriminant;
#[derive(Debug)]
enum LibConfigIntNumber {
Oct(i64),
Hex(i64),
Int(i64),
}
#[derive(Debug)]
enum LibConfigValue {
Bool(bool),
Int(LibConfigIntNumber),
Float(f64),
String(String),
Array(Vec<LibConfigValue>),
List(Vec<LibConfigValue>),
Group(Vec<String>, Vec<(String, LibConfigValue)>),
}
fn validate_setting_name(key: &str) -> bool {
let first_char = key.chars().next().expect("Empty setting name");
(first_char.is_alphabetic() || first_char == '*')
&& key[1..]
.chars()
.all(|c| c.is_alphanumeric() || c == '_' || c == '*')
}
const SPECIAL_TYPES: [&str; 5] = ["octal", "hex", "float", "list", "array"];
fn object_is_special_type(o: &serde_json::Map<String, Value>) -> Option<&str> {
o.get("_type").and_then(|x| x.as_str()).and_then(|x| {
if SPECIAL_TYPES.contains(&x) {
Some(x)
} else {
None
}
})
}
fn vec_is_array(v: &Vec<LibConfigValue>) -> bool {
if v.is_empty() {
return true;
}
let first_item = v.first().unwrap();
if match first_item {
LibConfigValue::Array(_) => true,
LibConfigValue::List(_) => true,
LibConfigValue::Group(_, _) => true,
_ => false,
} {
return false;
};
v[1..]
.iter()
.all(|item| discriminant(first_item) == discriminant(item))
}
fn json_to_libconfig(v: &Value) -> LibConfigValue {
match v {
Value::Null => panic!("Null value not allowed in libconfig"),
Value::Bool(b) => LibConfigValue::Bool(b.clone()),
Value::Number(n) => {
if n.is_i64() {
LibConfigValue::Int(LibConfigIntNumber::Int(n.as_i64().unwrap()))
} else if n.is_f64() {
LibConfigValue::Float(n.as_f64().unwrap())
} else {
panic!("{} is not i64 or f64, cannot be represented as number in libconfig", n);
}
}
Value::String(s) => LibConfigValue::String(s.to_string()),
Value::Array(a) => {
let items = a
.iter()
.map(|item| json_to_libconfig(item))
.collect::<Vec<LibConfigValue>>();
LibConfigValue::List(items)
}
Value::Object(o) => {
if let Some(_type) = object_is_special_type(o) {
let value = o
.get("value")
.expect(format!("Missing value for special type: {}", &_type).as_str());
return match _type {
"octal" => {
let str_value = value
.as_str()
.expect(
format!("Value is not a string for special type: {}", &_type)
.as_str(),
)
.to_owned();
LibConfigValue::Int(LibConfigIntNumber::Oct(
i64::from_str_radix(&str_value, 8)
.expect(format!("Invalid octal value: {}", value).as_str()),
))
}
"hex" => {
let str_value = value
.as_str()
.expect(
format!("Value is not a string for special type: {}", &_type)
.as_str(),
)
.to_owned();
LibConfigValue::Int(LibConfigIntNumber::Hex(
i64::from_str_radix(&str_value[2..], 16)
.expect(format!("Invalid hex value: {}", value).as_str()),
))
}
"float" => {
let str_value = value
.as_str()
.expect(
format!("Value is not a string for special type: {}", &_type)
.as_str(),
)
.to_owned();
LibConfigValue::Float(
str_value
.parse::<f64>()
.expect(format!("Invalid float value: {}", value).as_str()),
)
}
"list" => {
let items = value
.as_array()
.expect(
format!("Value is not an array for special type: {}", &_type)
.as_str(),
)
.to_owned()
.iter()
.map(|item| json_to_libconfig(item))
.collect::<Vec<LibConfigValue>>();
LibConfigValue::List(items)
}
"array" => {
let items = value
.as_array()
.expect(
format!("Value is not an array for special type: {}", &_type)
.as_str(),
)
.to_owned()
.iter()
.map(|item| json_to_libconfig(item))
.collect::<Vec<LibConfigValue>>();
if !vec_is_array(&items) {
panic!(
"This can not be an array because of its contents: {:#?}",
items
);
}
LibConfigValue::Array(items)
}
_ => panic!("Invalid type: {}", _type),
};
}
let mut items = o
.iter()
.filter(|(key, _)| key.as_str() != "_includes")
.map(|(key, value)| (key.clone(), json_to_libconfig(value)))
.collect::<Vec<(String, LibConfigValue)>>();
items.sort_by(|(a,_),(b,_)| a.partial_cmp(b).unwrap());
let includes = o
.get("_includes")
.map(|x| {
x.as_array()
.expect("_includes is not an array")
.iter()
.map(|x| {
x.as_str()
.expect("_includes item is not a string")
.to_owned()
})
.collect::<Vec<String>>()
})
.unwrap_or(vec![]);
for (key,_) in items.iter() {
if !validate_setting_name(key) {
panic!("Invalid setting name: {}", key);
}
}
LibConfigValue::Group(includes, items)
}
}
}
impl ToString for LibConfigValue {
fn to_string(&self) -> String {
match self {
LibConfigValue::Bool(b) => b.to_string(),
LibConfigValue::Int(i) => match i {
LibConfigIntNumber::Oct(n) => format!("0{:o}", n),
LibConfigIntNumber::Hex(n) => format!("0x{:x}", n),
LibConfigIntNumber::Int(n) => n.to_string(),
},
LibConfigValue::Float(n) => format!("{:?}", n),
LibConfigValue::String(s) => {
format!("\"{}\"", s.replace("\\", "\\\\").replace("\"", "\\\""))
}
LibConfigValue::Array(a) => {
let items = a
.iter()
.map(|item| item.to_string())
.collect::<Vec<String>>()
.join(", ");
format!("[{}]", items)
}
LibConfigValue::List(a) => {
let items = a
.iter()
.map(|item| item.to_string())
.collect::<Vec<String>>()
.join(", ");
format!("({})", items)
}
LibConfigValue::Group(i, o) => {
let includes = i
.iter()
.map(|x| x.replace("\\", "\\\\").replace("\"", "\\\""))
.map(|x| format!("@include \"{}\"", x))
.collect::<Vec<String>>()
.join("\n");
let items = o
.iter()
.map(|(key, value)| format!("{}={};", key, value.to_string()))
.collect::<Vec<String>>()
.join("");
if includes.is_empty() {
format!("{{{}}}", items)
} else {
format!("{{\n{}\n{}}}", includes, items)
}
}
}
}
}
fn main() {
let stdin = std::io::stdin().lock();
let json = serde_json::Deserializer::from_reader(stdin)
.into_iter::<Value>()
.next()
.expect("Could not read content from stdin")
.expect("Could not parse JSON from stdin");
for (key, value) in json
.as_object()
.expect("Top level of JSON file is not an object")
{
print!("{}={};", key, json_to_libconfig(value).to_string());
}
print!("\n\n");
}
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