to_object_unsafe/
to_object_unsafe.rs

1//! Uses iterations rather than recursion to build a object map. Unfortunately at the cost of using `unsafe`
2
3use std::collections::HashMap;
4
5use simple_json_parser::{parse, JSONKey, RootJSONValue};
6
7fn main() -> Result<(), Box<dyn std::error::Error>> {
8    let path = std::env::args().nth(1).ok_or("Expected first argument")?;
9    let content = std::fs::read_to_string(path)?;
10
11    pub type Object = HashMap<String, Value>;
12
13    #[derive(Debug)]
14    #[allow(dead_code)]
15    pub enum Value {
16        Object(Object),
17        String(String),
18        Number(String),
19        Boolean(bool),
20        Null,
21    }
22
23    impl Value {
24        pub fn new_empty_object() -> Self {
25            Self::Object(HashMap::new())
26        }
27    }
28
29    let mut root = Object::new();
30
31    let _res = parse(&content, |keys, value| {
32        let [path @ .., end] = keys else {
33            unreachable!("empty key change")
34        };
35        let pointer = &mut root;
36
37        let mut to_add_to: *mut Object = pointer;
38
39        for key in path {
40            let name = match key {
41                JSONKey::Slice(s) => (*s).to_string(),
42                JSONKey::Index(i) => i.to_string(),
43            };
44            if let Some(Value::Object(ref mut obj)) =
45                unsafe { (to_add_to.as_mut().unwrap()).get_mut(&name) }
46            {
47                to_add_to = obj;
48            } else {
49                let value = unsafe {
50                    (to_add_to.as_mut().unwrap())
51                        .entry(name)
52                        .or_insert_with(Value::new_empty_object)
53                };
54                if let Value::Object(ref mut obj) = value {
55                    to_add_to = obj;
56                }
57            }
58        }
59        let name = match end {
60            JSONKey::Slice(s) => (*s).to_string(),
61            JSONKey::Index(i) => i.to_string(),
62        };
63        let value = match value {
64            RootJSONValue::String(s) => Value::String(s.to_string()),
65            RootJSONValue::Number(n) => Value::Number(n.to_string()),
66            RootJSONValue::Boolean(v) => Value::Boolean(v),
67            RootJSONValue::Null => Value::Null,
68        };
69        unsafe {
70            (to_add_to.as_mut().unwrap()).insert(name, value);
71        }
72    });
73
74    eprintln!("Parsed: {root:#?}");
75    Ok(())
76}
to_object_unsafe/to_object_unsafe.rs

to_object_unsafe/
to_object_unsafe.rs
