1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use std::{cell::RefCell, hash::Hash, rc::Rc};

use crate::{
	error::{Error, ErrorSource},
	pat_check,
	scope::ScopeRef,
};

pub enum DataType {
	Boolean,
	Number,
	String,
	Name,
	Scope,
	None,
	Or(Box<DataType>, Box<DataType>),
	Any,
}

impl DataType {
	pub fn from_string(string: &String) -> Result<DataType, Error> {
		if string == "boolean" {
			Ok(DataType::Boolean)
		} else if string == "number" {
			Ok(DataType::Number)
		} else if string == "string" {
			Ok(DataType::String)
		} else if string == "name" {
			Ok(DataType::Name)
		} else if string == "scope" {
			Ok(DataType::Scope)
		} else if string == "none" {
			Ok(DataType::None)
		} else if string == "any" {
			Ok(DataType::Any)
		} else {
			Err(Error::new(
				&format!("Invalid type string {}.", string),
				ErrorSource::Internal,
			))
		}
	}

	pub fn to_string(&self) -> String {
		match self {
			DataType::Boolean => String::from("boolean"),
			DataType::Number => String::from("number"),
			DataType::String => String::from("string"),
			DataType::Name => String::from("name"),
			DataType::Scope => String::from("scope"),
			DataType::None => String::from("none"),
			DataType::Any => String::from("any"),
			DataType::Or(a, b) => a.to_string() + " | " + &b.to_string(),
		}
	}

	pub fn matches(&self, data: &Data) -> bool {
		match self {
			DataType::Boolean => pat_check!(Data::Boolean(_) = data),
			DataType::Number => pat_check!(Data::Number(_) = data),
			DataType::String => pat_check!(Data::String(_) = data),
			DataType::Name => pat_check!(Data::Name { .. } = data),
			DataType::Scope => pat_check!(Data::Scope(_) = data),
			DataType::None => pat_check!(Data::None = data),
			DataType::Or(a, b) => a.matches(data) || b.matches(data),
			DataType::Any => true,
		}
	}
}

#[derive(Clone, Debug)]
pub enum Data {
	Boolean(bool),
	Number(f64),
	String(String),
	Name { scope: ScopeRef, name: String },
	Scope(ScopeRef),
	None,
}

impl Data {
	pub fn get_type(&self) -> DataType {
		match self {
			Data::Boolean(_) => DataType::Boolean,
			Data::Number(_) => DataType::Number,
			Data::String(_) => DataType::String,
			Data::Name { .. } => DataType::Name,
			Data::Scope(_) => DataType::Scope,
			Data::None => DataType::None,
		}
	}
}

impl PartialEq for Data {
	fn eq(&self, other: &Self) -> bool {
		match (self, other) {
			(Self::Boolean(l), Self::Boolean(r)) => l == r,
			(Self::Number(l), Self::Number(r)) => l == r,
			(Self::String(l), Self::String(r)) => l == r,
			(Self::None, Self::None) => true,
			(
				Self::Name { scope, name },
				Self::Name {
					scope: r_scope,
					name: r_name,
				},
			) => Rc::ptr_eq(scope, r_scope) && name == r_name,
			(Self::Scope(l), Self::Scope(r)) => Rc::ptr_eq(l, r),
			_ => false,
		}
	}
}

impl Eq for Data {}

impl Hash for Data {
	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
		core::mem::discriminant(self).hash(state);
	}
}

impl Default for Data {
	fn default() -> Self {
		Data::None
	}
}

impl ToString for Data {
	fn to_string(&self) -> String {
		match self {
			Data::Boolean(v) => {
				if *v {
					String::from("true")
				} else {
					String::from("false")
				}
			}
			Data::Number(v) => v.to_string(),
			Data::String(s) => s.clone(),
			Data::Name { scope: _, name } => format!("<{}>", name),
			Data::Scope(scope) => RefCell::borrow(&scope).to_string(),
			Data::None => String::from("[none]"),
		}
	}
}