omp-codegen 0.3.0

Codegen for omprs
Documentation 
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

use proc_macro::TokenStream;
use quote::quote;
use syn::{
    parse::{Parse, ParseStream},
    parse_macro_input, token, Ident, Token, Type,
};
fn convert_to_snake_case(name: Ident) -> Ident {
    let characters = name.to_string();
    let mut characters = characters.chars();
    let mut out = String::new();
    out.push(characters.next().unwrap().to_ascii_lowercase());
    for x in characters {
        if x.is_uppercase() {
            out.push('_');
            out.push(x.to_ascii_lowercase());
        } else {
            out.push(x);
        }
    }
    Ident::new(&out, name.span())
}

#[derive(Clone)]
struct CreateCallback {
    name: Ident,
    params: Vec<(Ident, Ident, bool)>,
    return_type: Option<Type>,
}

impl Parse for CreateCallback {
    fn parse(input: ParseStream) -> Result<Self, syn::Error> {
        let name: Ident = input.parse()?;
        let mut params = Vec::new();
        let mut return_type = None;

        while !input.is_empty() {
            let _: Token![,] = input.parse()?;
            if input.peek(token::RArrow) {
                let _: token::RArrow = input.parse()?;
                return_type = Some(input.parse()?);
            } else {
                let param_name: Ident = input.parse()?;
                let _: Token![:] = input.parse()?;
                let param_type: Ident = input.parse()?;
                if param_type == "Option" {
                    let _: Token![<] = input.parse()?;
                    let param_type: Ident = input.parse()?;
                    let _: Token![>] = input.parse()?;
                    params.push((param_name, param_type, true));
                } else {
                    params.push((param_name, param_type, false));
                }
            }
        }
        Ok(CreateCallback {
            name,
            params,
            return_type,
        })
    }
}
pub fn create_callback(input: TokenStream) -> TokenStream {
    let callback = parse_macro_input!(input as CreateCallback);
    let user_func_name = callback.name;
    let orig_callback_name = Ident::new(&format!("OMPRS_{user_func_name}"), user_func_name.span());
    let mut orig_callback_params = Vec::new();
    let user_func_name = convert_to_snake_case(user_func_name);
    let mut user_func_args = Vec::new();

    for (param_name, param_type, is_option) in callback.params {
        if param_type == "String" {
            orig_callback_params.push(quote!(#param_name:crate::types::stringview::StringView,));
            user_func_args.push(quote!(#param_name.get_data(),));
        } else if param_type == "Player"
            || param_type == "Actor"
            || param_type == "Vehicle"
            || param_type == "Object"
            || param_type == "GangZone"
            || param_type == "PlayerObject"
            || param_type == "Pickup"
            || param_type == "TextDraw"
            || param_type == "PlayerTextDraw"
        {
            if is_option {
                orig_callback_params.push(quote!(#param_name:*const std::ffi::c_void,));
                user_func_args.push(quote!(
                    if #param_name.is_null(){
                        None
                    } else {
                        Some(#param_type::new(#param_name))
                    },
                ));
            } else {
                orig_callback_params.push(quote!(#param_name:*const std::ffi::c_void,));
                user_func_args.push(quote!(#param_type::new(#param_name),));
            }
        } else {
            orig_callback_params.push(quote!(#param_name:#param_type,));
            user_func_args.push(quote!(#param_name,));
        }
    }

    let orig_function = if let Some(ref return_type) = callback.return_type {
        quote!(
            #[no_mangle]
            pub unsafe extern "C" fn #orig_callback_name(#(#orig_callback_params)*) -> #return_type {
                let scripts = crate::runtime::Runtime.as_mut().unwrap();
                let mut ret = false;
                for script in scripts.iter_mut() {
                    ret = script.#user_func_name(#(#user_func_args)*);
                    if crate::runtime::__terminate_event_chain {
                        crate::runtime::__terminate_event_chain = false;
                        return ret;
                    }
                }
                ret

            }
        )
    } else {
        quote!(
            #[no_mangle]
            pub unsafe extern "C" fn #orig_callback_name(#(#orig_callback_params)*) {
                let scripts = crate::runtime::Runtime.as_mut().unwrap();
                for script in scripts.iter_mut() {
                    script.#user_func_name(#(#user_func_args)*);
                }
            }
        )
    };
    let code = quote! {
        #orig_function
    };

    code.into()
}