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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
// Doc Not Optimize
use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use syn::parse::{Parse, ParseStream};
use syn::{Attribute, Ident, LitStr, Token};
enum DispatcherChainInput {
/// `dispatcher!("name", EntryType)` — explicit entry type
Default {
cmd_attrs: Vec<Attribute>,
entry_attrs: Vec<Attribute>,
command_name: syn::LitStr,
pack: Ident,
},
/// `dispatcher!("name")` — entry type derived from the command name
#[cfg(feature = "extras")]
Auto {
cmd_attrs: Vec<Attribute>,
command_name: syn::LitStr,
},
}
impl Parse for DispatcherChainInput {
fn parse(input: ParseStream) -> syn::Result<Self> {
// Collect outer attributes for the hidden dispatcher struct
let cmd_attrs = input.call(Attribute::parse_outer)?;
let command_name: LitStr = input.parse()?;
if input.is_empty() {
// Abbreviated form: just "command_name"
#[cfg(feature = "extras")]
{
return Ok(Self::Auto {
cmd_attrs,
command_name,
});
}
#[cfg(not(feature = "extras"))]
{
return Err(syn::Error::new(
command_name.span(),
"expected `, EntryType` after command name",
));
}
}
// Explicit form: "command_name", EntryType
input.parse::<Token![,]>()?;
let entry_attrs = input.call(Attribute::parse_outer)?;
let pack: Ident = input.parse()?;
// The old `"name", CMD => Entry` form was removed in 0.5.0.
if input.peek(Token![=>]) {
return Err(syn::Error::new(
pack.span(),
"the `dispatcher!(\"name\", CMD => Entry)` form was removed in 0.5.0; \
use `dispatcher!(\"name\", Entry)` — the dispatcher struct is generated internally",
));
}
Ok(Self::Default {
cmd_attrs,
entry_attrs,
command_name,
pack,
})
}
}
pub(crate) fn dispatcher(input: TokenStream) -> TokenStream {
let dispatcher_input = syn::parse_macro_input!(input as DispatcherChainInput);
#[cfg(not(feature = "extras"))]
let (command_name, pack, cmd_attrs, entry_attrs) = match dispatcher_input {
DispatcherChainInput::Default {
cmd_attrs,
entry_attrs,
command_name,
pack,
} => (command_name, pack, cmd_attrs, entry_attrs),
};
#[cfg(feature = "extras")]
let (command_name, pack, cmd_attrs, entry_attrs) = match dispatcher_input {
DispatcherChainInput::Default {
cmd_attrs,
entry_attrs,
command_name,
pack,
} => (command_name, pack, cmd_attrs, entry_attrs),
DispatcherChainInput::Auto {
cmd_attrs,
command_name,
} => {
let command_name_str = command_name.value();
let pascal = just_fmt::pascal_case!(&command_name_str);
let pack = Ident::new(&format!("Entry{pascal}"), command_name.span());
(command_name, pack, cmd_attrs, Vec::new())
}
};
let command_name_str = command_name.value();
let hidden_dispatcher = Ident::new(
&format!("__Dispatcher{}", just_fmt::pascal_case!(&command_name_str)),
command_name.span(),
);
let comp_entry = get_comp_entry(&pack);
let compile_time_registration =
get_compile_time_registration(&command_name_str, &hidden_dispatcher, &pack);
let program_type = crate::default_program_path();
let expanded = quote! {
#[derive(::mingling::Grouped, ::mingling::Wrap, Default)]
#(#entry_attrs)*
pub struct #pack(pub ::std::vec::Vec<::std::string::String>);
#(#cmd_attrs)*
#[doc(hidden)]
#[derive(Debug, Default)]
#[allow(nonstandard_style)]
pub struct #hidden_dispatcher;
#compile_time_registration
impl From<#pack> for crate::Entry {
fn from(value: #pack) -> Self {
crate::Entry(value.0)
}
}
#comp_entry
impl ::mingling::Dispatcher<#program_type> for #hidden_dispatcher {
fn begin(&self, args: Vec<String>) -> ::mingling::ChainProcess<#program_type> {
use ::mingling::Grouped;
::mingling::Routable::to_chain(#pack(args))
}
}
};
expanded.into()
}
#[cfg(feature = "comp")]
fn get_comp_entry(entry_name: &Ident) -> TokenStream2 {
let comp_entry = quote! {
impl ::mingling::CompletionEntry for #entry_name {
fn get_input(self) -> Vec<String> {
self.0.clone()
}
}
};
comp_entry
}
#[cfg(not(feature = "comp"))]
fn get_comp_entry(_entry_name: &Ident) -> TokenStream2 {
quote! {}
}
/// Registers the dispatcher at compile time (collects its node into the
/// global `COMPILE_TIME_DISPATCHERS` registry and emits the
/// `__internal_dispatcher_*` static), regardless of the `dispatch_tree`
/// feature. The feature only selects which matching strategy
/// (trie vs. linear list) is generated later by `gen_program!`.
fn get_compile_time_registration(
command_name_str: &str,
dispatcher_struct: &Ident,
entry_name: &Ident,
) -> TokenStream2 {
let node_name_lit = syn::LitStr::new(command_name_str, proc_macro2::Span::call_site());
quote! {
::mingling::macros::register_dispatcher!(#node_name_lit, #dispatcher_struct, #entry_name);
}
}
|
