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
|
import to_str::ToStr;
import dvec::{DVec, dvec};
import ast::{ident};
import ast_builder::{path, append_types};
enum direction {
send, recv
}
impl direction: ToStr {
fn to_str() -> ~str {
match self {
send => ~"send",
recv => ~"recv"
}
}
}
impl direction {
fn reverse() -> direction {
match self {
send => recv,
recv => send
}
}
}
type next_state = option<{state: ident, tys: ~[@ast::ty]}>;
enum message {
// name, span, data, current state, next state
message(ident, span, ~[@ast::ty], state, next_state)
}
impl message {
fn name() -> ident {
match self {
message(id, _, _, _, _) => id
}
}
fn span() -> span {
match self {
message(_, span, _, _, _) => span
}
}
/// Return the type parameters actually used by this message
fn get_params() -> ~[ast::ty_param] {
match self {
message(_, _, _, this, _) => this.ty_params
}
}
}
enum state {
state_(@{
id: uint,
name: ident,
span: span,
dir: direction,
ty_params: ~[ast::ty_param],
messages: DVec<message>,
proto: protocol,
}),
}
impl state {
fn add_message(name: ident, span: span,
+data: ~[@ast::ty], next: next_state) {
self.messages.push(message(name, span, data, self,
next));
}
fn filename() -> ~str {
(*self).proto.filename()
}
fn data_name() -> ident {
self.name
}
/// Returns the type that is used for the messages.
fn to_ty(cx: ext_ctxt) -> @ast::ty {
cx.ty_path_ast_builder
(path(self.name, self.span).add_tys(cx.ty_vars(self.ty_params)))
}
/// Iterate over the states that can be reached in one message
/// from this state.
fn reachable(f: fn(state) -> bool) {
for self.messages.each |m| {
match m {
message(_, _, _, _, some({state: id, _})) => {
let state = self.proto.get_state(id);
if !f(state) { break }
}
_ => ()
}
}
}
}
type protocol = @protocol_;
fn protocol(name: ident, +span: span) -> protocol {
@protocol_(name, span)
}
struct protocol_ {
let name: ident;
let span: span;
let states: DVec<state>;
let mut bounded: option<bool>;
new(name: ident, span: span) {
self.name = name;
self.span = span;
self.states = dvec();
self.bounded = none;
}
/// Get a state.
fn get_state(name: ident) -> state {
self.states.find(|i| i.name == name).get()
}
fn get_state_by_id(id: uint) -> state { self.states[id] }
fn has_state(name: ident) -> bool {
self.states.find(|i| i.name == name) != none
}
fn filename() -> ~str {
~"proto://" + *self.name
}
fn num_states() -> uint { self.states.len() }
fn has_ty_params() -> bool {
for self.states.each |s| {
if s.ty_params.len() > 0 {
return true;
}
}
false
}
fn is_bounded() -> bool {
let bounded = self.bounded.get();
bounded
//if bounded && self.has_ty_params() {
// debug!{"protocol %s has is bounded, but type parameters\
// are not yet supported.",
// *self.name};
// false
//}
//else { bounded }
}
}
impl protocol {
fn add_state(name: ident, dir: direction) -> state {
self.add_state_poly(name, dir, ~[])
}
fn add_state_poly(name: ident, dir: direction,
+ty_params: ~[ast::ty_param]) -> state {
let messages = dvec();
let state = state_(@{
id: self.states.len(),
name: name,
span: self.span,
dir: dir,
ty_params: ty_params,
messages: messages,
proto: self
});
self.states.push(state);
state
}
}
trait visitor<Tproto, Tstate, Tmessage> {
fn visit_proto(proto: protocol, st: &[Tstate]) -> Tproto;
fn visit_state(state: state, m: &[Tmessage]) -> Tstate;
fn visit_message(name: ident, spane: span, tys: &[@ast::ty],
this: state, next: next_state) -> Tmessage;
}
fn visit<Tproto, Tstate, Tmessage, V: visitor<Tproto, Tstate, Tmessage>>(
proto: protocol, visitor: V) -> Tproto {
// the copy keywords prevent recursive use of dvec
let states = do (copy proto.states).map_to_vec |s| {
let messages = do (copy s.messages).map_to_vec |m| {
let message(name, span, tys, this, next) = m;
visitor.visit_message(name, span, tys, this, next)
};
visitor.visit_state(s, messages)
};
visitor.visit_proto(proto, states)
}
|
