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

use core::panic;
use std::{any::Any, collections::HashMap, fs, path::PathBuf, rc::Rc};

use crate::{
	data::Data,
	error::{BeanResult, Error, ErrorSource},
	evaluator, lexer, parser,
	scope::{function::Function, Scope},
	util::{make_ref, MutRc},
};

use super::{
	registry::{ModuleRegistry, RegistryEntry},
	CustomModule, Module,
};

#[derive(Debug)]
pub struct ModuleWrapper(MutRc<dyn Module>);

impl Scope for ModuleWrapper {
	fn has_function(&self, name: &str) -> bool {
		self.0.borrow().has_pub_function(name)
	}

	fn get_function(&self, name: &str) -> Option<Function> {
		self.0.borrow().get_pub_function(name)
	}

	fn set_function(&mut self, _name: &str, _function: Function) {
		panic!("Tried to set function inside external module.")
	}

	fn delete_function(&mut self, _name: &str) {
		panic!("Tried to delete function inside external module.")
	}

	fn set_return_value(&mut self, _value: Data) {}

	fn get_function_list(&self) -> HashMap<String, Function> {
		self.0.borrow().get_function_list()
	}

	fn as_any(&self) -> &dyn Any {
		panic!("INTERNAL! tried to cast ModuleWrapper")
	}
	fn as_mut(&mut self) -> &mut dyn Any {
		self
	}

	fn set_if_state(&mut self, _state: crate::scope::block_scope::IfState) {}
}

pub fn get(module: &CustomModule, path: String) -> Result<MutRc<ModuleWrapper>, Error> {
	let registry = module.registry.clone();

	if path.starts_with("./") {
		let mut path_buf = module.file_path.clone();
		path_buf.push(path.clone().trim_start_matches("./"));
		path_buf.set_extension("bean");

		get_local(Rc::clone(&registry), path_buf).map(|m| make_ref(ModuleWrapper(m)))
	} else {
		get_reg(&mut registry.borrow_mut().registered, path.clone()).map_or(
			Err(Error::new(
				&format!("Module {} does not exist.", path),
				ErrorSource::Internal,
			)),
			|s| Ok(make_ref(ModuleWrapper(s))),
		)
	}
}

fn get_reg(
	registered: &mut HashMap<String, RegistryEntry>,
	name: String,
) -> Option<MutRc<dyn Module>> {
	if let Some(RegistryEntry::Uninitialized(_)) = registered.get(&name) {
		let v = registered.remove(&name).unwrap().get_or_init();
		registered.insert(name.clone(), RegistryEntry::Available(v));
	}

	registered.get(&name).map_or(None, |x| match x {
		RegistryEntry::Available(r) => Some(Rc::clone(r)),
		RegistryEntry::Uninitialized(_) => None,
	})
}

fn get_local(
	registry: MutRc<ModuleRegistry>,
	path: PathBuf,
) -> Result<MutRc<CustomModule>, Error> {
	if !registry.borrow().features.custom_modules {
		return Err(Error::new(
			"Cannot load custom files.",
			ErrorSource::Internal,
		));
	}

	if registry.borrow().loading.contains(&path) {
		return Err(Error::new(
			"Trying to load from a file that is currently being loaded.",
			ErrorSource::Internal,
		));
	}
	let exists = registry.borrow().local.get(&path).is_none();
	if exists {
		let file = fs::read_to_string(path.clone()).map_err(|e| {
			Error::new(
				&(String::from("Error reading file ")
					+ path.to_str().unwrap_or("")
					+ ": " + &e.to_string()),
				ErrorSource::Internal,
			)
		})?;

		let tokens = lexer::tokenize(file);
		let tree = parser::parse(tokens)?;

		let module = CustomModule::new(Rc::clone(&registry), path.clone());
		let module_ref = make_ref(module);
		registry.borrow_mut().loading.push(path.clone());

		evaluator::evaluate(&tree, CustomModule::to_scope(Rc::clone(&module_ref)))
			.trace(ErrorSource::File(path.to_str().unwrap().to_string()))?;

		let mut registry_mut = registry.borrow_mut();
		registry_mut.local.insert(path.clone(), module_ref);
		registry_mut.loading.pop();
	}

	Ok(Rc::clone(registry.borrow().local.get(&path).unwrap()))
}