to_object/
to_object.rs

1use std::collections::HashMap;
2
3use simple_json_parser::{parse, JSONKey, RootJSONValue};
4
5fn main() -> Result<(), Box<dyn std::error::Error>> {
6    let path = std::env::args().nth(1).ok_or("Expected first argument")?;
7    let content = std::fs::read_to_string(path)?;
8
9    pub type Object = HashMap<String, Value>;
10
11    #[derive(Debug)]
12    #[allow(dead_code)]
13    pub enum Value {
14        Object(Object),
15        String(String),
16        Number(String),
17        Boolean(bool),
18        Null,
19    }
20
21    impl Value {
22        pub fn new_empty_object() -> Self {
23            Self::Object(HashMap::new())
24        }
25
26        pub fn set<'a>(&'a mut self, keys: &'a [JSONKey<'a>], value: RootJSONValue<'a>) {
27            if let Value::Object(ref mut obj) = self {
28                if let [last] = keys {
29                    let name = match last {
30                        JSONKey::Slice(s) => (*s).to_string(),
31                        JSONKey::Index(i) => i.to_string(),
32                    };
33                    let value = match value {
34                        RootJSONValue::String(s) => Value::String(s.to_string()),
35                        RootJSONValue::Number(n) => Value::Number(n.to_string()),
36                        RootJSONValue::Boolean(v) => Value::Boolean(v),
37                        RootJSONValue::Null => Value::Null,
38                    };
39                    let existing = obj.insert(name, value);
40                    debug_assert!(existing.is_none());
41                } else if let [first, others @ ..] = keys {
42                    let name = match first {
43                        JSONKey::Slice(s) => (*s).to_string(),
44                        JSONKey::Index(i) => i.to_string(),
45                    };
46                    obj.entry(name)
47                        .or_insert_with(Value::new_empty_object)
48                        .set(others, value);
49                } else {
50                    unreachable!("empty keys")
51                }
52            } else {
53                unreachable!()
54            }
55        }
56    }
57
58    let mut root = Value::new_empty_object();
59
60    parse(&content, |keys, value| root.set(keys, value))?;
61
62    eprintln!("Parsed: {root:#?}");
63    Ok(())
64}
to_object/to_object.rs

to_object/
to_object.rs
