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

use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
use proc_macro2::{Ident, TokenStream};
use quote::{format_ident, quote};
use witx::{AtomType, BuiltinType, Id, TypeRef};

use crate::lifetimes::LifetimeExt;
use crate::Config;

#[derive(Debug, Clone)]
pub struct Names {
    config: Config,
}

impl Names {
    pub fn new(config: &Config) -> Names {
        Names {
            config: config.clone(),
        }
    }
    pub fn ctx_type(&self) -> Ident {
        self.config.ctx.name.clone()
    }
    pub fn type_(&self, id: &Id) -> TokenStream {
        let ident = format_ident!("{}", id.as_str().to_camel_case());
        quote!(#ident)
    }
    pub fn builtin_type(&self, b: BuiltinType, lifetime: TokenStream) -> TokenStream {
        match b {
            BuiltinType::String => quote!(wiggle::GuestPtr<#lifetime, str>),
            BuiltinType::U8 => quote!(u8),
            BuiltinType::U16 => quote!(u16),
            BuiltinType::U32 => quote!(u32),
            BuiltinType::U64 => quote!(u64),
            BuiltinType::S8 => quote!(i8),
            BuiltinType::S16 => quote!(i16),
            BuiltinType::S32 => quote!(i32),
            BuiltinType::S64 => quote!(i64),
            BuiltinType::F32 => quote!(f32),
            BuiltinType::F64 => quote!(f64),
            BuiltinType::Char8 => quote!(u8),
            BuiltinType::USize => quote!(u32),
        }
    }
    pub fn atom_type(&self, atom: AtomType) -> TokenStream {
        match atom {
            AtomType::I32 => quote!(i32),
            AtomType::I64 => quote!(i64),
            AtomType::F32 => quote!(f32),
            AtomType::F64 => quote!(f64),
        }
    }

    pub fn type_ref(&self, tref: &TypeRef, lifetime: TokenStream) -> TokenStream {
        match tref {
            TypeRef::Name(nt) => {
                let ident = self.type_(&nt.name);
                if nt.tref.needs_lifetime() {
                    quote!(#ident<#lifetime>)
                } else {
                    quote!(#ident)
                }
            }
            TypeRef::Value(ty) => match &**ty {
                witx::Type::Builtin(builtin) => self.builtin_type(*builtin, lifetime.clone()),
                witx::Type::Pointer(pointee) | witx::Type::ConstPointer(pointee) => {
                    let pointee_type = self.type_ref(&pointee, lifetime.clone());
                    quote!(wiggle::GuestPtr<#lifetime, #pointee_type>)
                }
                witx::Type::Array(pointee) => {
                    let pointee_type = self.type_ref(&pointee, lifetime.clone());
                    quote!(wiggle::GuestPtr<#lifetime, [#pointee_type]>)
                }
                _ => unimplemented!("anonymous type ref {:?}", tref),
            },
        }
    }

    pub fn enum_variant(&self, id: &Id) -> Ident {
        // FIXME this is a hack - just a proof of concept.
        if id.as_str().starts_with('2') {
            format_ident!("TooBig")
        } else if id.as_str() == "type" {
            format_ident!("Type")
        } else {
            format_ident!("{}", id.as_str().to_camel_case())
        }
    }

    pub fn flag_member(&self, id: &Id) -> Ident {
        format_ident!("{}", id.as_str().to_shouty_snake_case())
    }

    pub fn int_member(&self, id: &Id) -> Ident {
        format_ident!("{}", id.as_str().to_shouty_snake_case())
    }

    pub fn struct_member(&self, id: &Id) -> Ident {
        // FIXME this is a hack - just a proof of concept.
        if id.as_str() == "type" {
            format_ident!("type_")
        } else {
            format_ident!("{}", id.as_str().to_snake_case())
        }
    }

    pub fn module(&self, id: &Id) -> Ident {
        format_ident!("{}", id.as_str().to_snake_case())
    }

    pub fn trait_name(&self, id: &Id) -> Ident {
        format_ident!("{}", id.as_str().to_camel_case())
    }

    pub fn func(&self, id: &Id) -> Ident {
        format_ident!("{}", id.as_str().to_snake_case())
    }

    pub fn func_param(&self, id: &Id) -> Ident {
        // FIXME this is a hack - just a proof of concept.
        if id.as_str() == "in" {
            format_ident!("in_")
        } else {
            format_ident!("{}", id.as_str().to_snake_case())
        }
    }

    pub fn func_core_arg(&self, arg: &witx::CoreParamType) -> Ident {
        match arg.signifies {
            witx::CoreParamSignifies::Value { .. } => self.func_param(&arg.param.name),
            witx::CoreParamSignifies::PointerTo => self.func_ptr_binding(&arg.param.name),
            witx::CoreParamSignifies::LengthOf => self.func_len_binding(&arg.param.name),
        }
    }

    /// For when you need a {name}_ptr binding for passing a value by reference:
    pub fn func_ptr_binding(&self, id: &Id) -> Ident {
        format_ident!("{}_ptr", id.as_str().to_snake_case())
    }

    /// For when you need a {name}_len binding for passing an array:
    pub fn func_len_binding(&self, id: &Id) -> Ident {
        format_ident!("{}_len", id.as_str().to_snake_case())
    }
}