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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
use std::collections::HashMap;
use impl_block::CompiledImplBlock;
use proc_macro2::TokenStream;
use quote::ToTokens;
use role::{to_role_name, CompiledRole};
use syn::{visit_mut::VisitMut, Block, Expr, ItemStruct, Member};
use crate::analysis::{ContextInfo, FunctionDescription, GenericsInfo, ImplBlockInfo, TraitInfo};
use super::*;
impl Compiler<ContextInfo> for ContextInfo {
fn compile(&self) -> CompiledContext {
let base = self.compile_struct();
// Get the type name and generics from the base struct
let type_name = &base.ident;
let generics = GenericsInfo::from_syn_generics(&base.generics);
// Create roles_map for method compilation
let roles_map: HashMap<String, TraitInfo> = self
.roles
.iter()
.map(|r| (to_role_name(&r.name.to_string()), r.contract.clone()))
.collect();
// Create the context trait from impl block methods
let trait_methods =
self.impl_blocks
.iter()
.flat_map(|block| {
block.functions.iter().map(|f| {
match f {
FunctionDescription::Implementation { name, params, generics, output, .. } => {
let param_tokens = params.iter().map(|p| p.to_token_stream());
let generic_params = generics.get_params();
let where_clause = generics.get_where_clause();
// Only add angle brackets if we have generic parameters
let generic_tokens = if !generic_params.is_empty() {
quote::quote!(<#(#generic_params),*>)
} else {
quote::quote!()
};
let method: syn::TraitItem = syn::parse_quote! {
fn #name #generic_tokens (#(#param_tokens),*) #output #where_clause;
};
// Trait methods don't have visibility modifiers, so we can just return the method
method
},
_ => panic!("Expected implementation")
}
})
})
.collect::<Vec<syn::TraitItem>>();
let trait_name = syn::Ident::new("Context", proc_macro2::Span::call_site());
let trait_def = quote::quote! {
pub trait #trait_name {
#(#trait_methods)*
}
};
let context_trait = syn::parse2(trait_def).unwrap();
// Compile roles
let roles = self
.roles
.iter()
.map(|r| {
let mut compiled_role = r.compile(&roles_map);
compiled_role.impl_block.self_ty = syn::parse_quote!(#type_name #generics);
compiled_role.impl_block.generics = generics.clone();
compiled_role
})
.collect();
// Create impl blocks that implement Context
let context_methods = self
.impl_blocks
.iter()
.map(|b| {
let mut impl_block = self.compile_context_methods(&roles_map, b.clone());
impl_block.generics = generics.clone();
impl_block.implemented_traits = vec![syn::parse_quote!(Context)];
impl_block
})
.collect();
CompiledContext {
roles,
context_methods,
base,
context_trait,
}
}
type Output = CompiledContext;
}
#[derive(Clone)]
pub struct CompiledContext {
pub roles: Vec<CompiledRole>,
pub context_methods: Vec<CompiledImplBlock>,
pub base: ItemStruct,
pub context_trait: syn::ItemTrait,
}
impl Compiled<ContextInfo> for CompiledContext {
fn emit(&self) -> TokenStream {
let mut ts = TokenStream::new();
// First emit the struct definition
ts.extend(self.base.to_token_stream());
// Then emit the trait definition
ts.extend(self.context_trait.to_token_stream());
// Then emit the role implementations
ts.extend(TokenStream::from_iter(self.roles.iter().map(|r| r.emit())));
// Finally emit the context method implementations
ts.extend(TokenStream::from_iter(
self.context_methods.iter().flat_map(|r| r.emit()),
));
ts
}
}
impl ContextInfo {
fn is_primitive_type(ty: &syn::Type) -> bool {
match ty {
syn::Type::Path(type_path) => {
if let Some(segment) = type_path.path.segments.last() {
matches!(
segment.ident.to_string().as_str(),
"i32" | "i64" | "f32" | "f64" | "bool" | "char" | "str"
)
} else {
false
}
}
_ => false, // Treat all other types as non-primitive
}
}
fn rewrite_role_access(&self, roles: &HashMap<String, TraitInfo>, block: &mut Block) {
struct RoleMethodRewriter<'a> {
roles: &'a HashMap<String, TraitInfo>,
}
impl VisitMut for RoleMethodRewriter<'_> {
fn visit_expr_mut(&mut self, expr: &mut Expr) {
if let Expr::MethodCall(method_call) = expr {
if let Expr::Field(field_expr) = &*method_call.receiver {
if let Expr::Path(base_path) = &*field_expr.base {
if let Some(ident) = base_path.path.get_ident() {
if ident == "self" {
if let Member::Named(role_name) = &field_expr.member {
if let Some(role_trait) =
self.roles.get(&role_name.to_string())
{
// Only rewrite if method is in role but not in contract
let method_name = method_call.method.to_string();
let is_role_method = role_trait
.functions
.iter()
.any(|m| *m.get_name() == method_name);
if !is_role_method {
// Create the new method name: role_method
let new_method_name = syn::Ident::new(
&format!(
"{}_{}",
role_name, method_call.method
),
method_call.method.span(),
);
// Create new method call with the same arguments
let new_expr =
Expr::MethodCall(syn::ExprMethodCall {
attrs: method_call.attrs.clone(),
receiver: Box::new(Expr::Path(
syn::ExprPath {
attrs: vec![],
qself: None,
path: syn::parse_quote!(self),
},
)),
dot_token: method_call.dot_token,
method: new_method_name,
turbofish: None,
paren_token: method_call.paren_token,
args: method_call.args.clone(),
});
*expr = new_expr;
return;
}
}
}
}
}
}
}
}
syn::visit_mut::visit_expr_mut(self, expr);
}
}
let mut rewriter = RoleMethodRewriter { roles };
rewriter.visit_block_mut(block);
}
fn compile_context_methods(
&self,
roles_map: &HashMap<String, TraitInfo>,
impl_block: ImplBlockInfo,
) -> CompiledImplBlock {
let functions = impl_block
.functions
.iter()
.map(|func| {
match func {
FunctionDescription::Implementation {
name,
params,
generics,
output,
body,
} => {
let mut body = body.clone();
self.rewrite_role_access(roles_map, &mut body);
// Preserve the original parameters including self receiver
FunctionDescription::new_implementation(
name.clone(),
params.clone(), // Keep original params which include self receiver
generics.clone(),
output.clone(),
body,
)
}
f => f.clone(),
}
})
.collect();
ImplBlockInfo {
functions,
..impl_block
}
.compile()
}
fn compile_struct(&self) -> ItemStruct {
let mut generics_params = self.generics.get_params().clone();
// Map properties to their corresponding generic parameters or original types
let property_generics: Vec<_> = self
.properties
.iter()
.map(|prop| {
if Self::is_primitive_type(&prop.get_ty()) {
// Primitive type: use original type
(prop.get_name().clone(), prop.get_ty().clone(), None)
} else {
// Non-primitive type: use a generic parameter with a contract
let contract_name = format!(
"{}Contract",
to_upper_camel_case(&prop.get_name().to_string())
);
let generic_name = syn::Ident::new(
&format!("T{}", to_upper_camel_case(&prop.get_name().to_string())),
proc_macro2::Span::call_site(),
);
let contract_ident =
syn::Ident::new(&contract_name, proc_macro2::Span::call_site());
// Add the generic parameter to generics
generics_params.push(syn::GenericParam::Type(syn::TypeParam {
attrs: vec![],
ident: generic_name.clone(),
bounds: syn::punctuated::Punctuated::from_iter(vec![
syn::TypeParamBound::Trait(syn::TraitBound {
paren_token: None,
modifier: syn::TraitBoundModifier::None,
lifetimes: None,
path: syn::Path::from(contract_ident.clone()),
}),
]),
eq_token: None,
default: None,
colon_token: Some(Default::default()),
}));
// Return the generic type instead of the original type
(
prop.get_name().clone(),
syn::Type::Path(syn::TypePath {
qself: None,
path: syn::Path::from(generic_name),
}),
Some(contract_ident),
)
}
})
.collect();
// Generate fields for the struct
let fields: Vec<syn::Field> = property_generics
.into_iter()
.map(|(field_name, field_type, _)| syn::Field {
mutability: syn::FieldMutability::None,
attrs: vec![],
vis: syn::Visibility::Inherited,
ident: Some(field_name),
colon_token: Some(Default::default()),
ty: field_type,
})
.collect();
// Finalize generics with additional parameters
let mut gs = self.generics.to_syn_generics();
gs.params.extend(generics_params);
// Construct the struct
syn::ItemStruct {
attrs: vec![],
vis: syn::Visibility::Inherited,
struct_token: syn::token::Struct {
span: proc_macro2::Span::call_site(),
},
ident: self.name.clone(),
generics: syn::Generics {
lt_token: Some(Default::default()),
params: gs.params,
gt_token: Some(Default::default()),
where_clause: self.generics.get_where_clause(),
},
fields: syn::Fields::Named(syn::FieldsNamed {
brace_token: Default::default(),
named: syn::punctuated::Punctuated::from_iter(fields),
}),
semi_token: None,
}
}
}
fn to_upper_camel_case(input: &str) -> String {
input
.split('_') // Split on underscores
.map(|word| {
let mut chars = word.chars();
match chars.next() {
Some(first) => first.to_uppercase().collect::<String>() + chars.as_str(),
None => String::new(),
}
})
.collect::<String>()
}
impl GenericsInfo {
pub fn to_syn_generics(&self) -> syn::Generics {
syn::Generics {
lt_token: if self.get_params().is_empty() {
None
} else {
Some(Default::default())
},
params: self.get_params().clone().into_iter().collect(),
gt_token: if self.get_params().is_empty() {
None
} else {
Some(Default::default())
},
where_clause: self.get_where_clause().clone(),
}
}
}