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
use std::convert::From;
use crate::{
types::{Value, ValueType},
AnyException, AnyObject, Array, Class, Fixnum, Object, VerifiedObject,
};
/// `Enumerator`
#[derive(Debug)]
#[repr(C)]
pub struct Enumerator {
value: Value,
}
impl Enumerator {
/// Advances the iterator and returns the next value.
///
/// Returns [`Err`] when iteration is finished.
///
/// # Examples
///
/// ```
/// use rutie::{Array, Fixnum, Object, VM, VerifiedObject, Enumerator};
/// # VM::init();
///
/// let mut iter = Array::new().push(Fixnum::new(2)).push(Fixnum::new(1)).to_enum();
///
/// // A call to next() returns the next value...
/// assert_eq!(Ok(Fixnum::new(2).to_any_object()), iter.next());
/// assert_eq!(Ok(Fixnum::new(1).to_any_object()), iter.next());
///
/// // ... and then Err once it's over.
/// assert!(iter.next().is_err(), "not error!");
///
/// // More calls will always return Err.
/// assert!(iter.next().is_err(), "not error!");
/// assert!(iter.next().is_err(), "not error!");
/// ```
pub fn next(&mut self) -> Result<AnyObject, AnyException> {
self.protect_send("next", &[])
}
/// Advances the iterator and returns the next values.
///
/// Returns [`Err`] when iteration is finished.
///
/// # Examples
///
/// ```
/// use rutie::{Array, Fixnum, Object, VM, VerifiedObject, Enumerator};
/// # VM::init();
///
/// let mut array = Array::with_capacity(2);
///
/// array.push(Fixnum::new(1));
/// array.push(Fixnum::new(2));
///
/// let mut iter = array.to_enum();
///
/// // A call to next_values() returns the next values...
/// let mut result1 = Array::with_capacity(1);
/// result1.push(Fixnum::new(1));
/// assert_eq!(Ok(result1), iter.next_values());
/// let mut result2 = Array::with_capacity(1);
/// result2.push(Fixnum::new(2));
/// assert_eq!(Ok(result2), iter.next_values());
///
/// // ... and then Err once it's over.
/// assert!(iter.next_values().is_err(), "not error!");
///
/// // More calls will always retirn Err.
/// assert!(iter.next_values().is_err(), "not error!");
/// assert!(iter.next_values().is_err(), "not error!");
/// ```
pub fn next_values(&mut self) -> Result<Array, AnyException> {
self.protect_send("next_values", &[])
.map(|v| Array::from(v.value()))
}
/// Peeks into the iterator and returns the next value.
///
/// Returns [`Err`] when iteration is finished.
///
/// # Examples
///
/// ```
/// use rutie::{Array, Fixnum, Object, VM, VerifiedObject, Enumerator};
/// # VM::init();
///
/// let mut iter = Array::new().push(Fixnum::new(2)).push(Fixnum::new(1)).to_enum();
///
/// // A call to peek() returns the next value without progressing the iteration
/// assert_eq!(Ok(Fixnum::new(2).to_any_object()), iter.peek());
/// assert_eq!(Ok(Fixnum::new(2).to_any_object()), iter.peek());
/// ```
pub fn peek(&self) -> Result<AnyObject, AnyException> {
self.protect_send("peek", &[])
}
/// Peeks into the iterator and returns the next values.
///
/// Returns [`Err`] when iteration is finished.
///
/// # Examples
///
/// ```
/// use rutie::{Array, Fixnum, Object, VM, VerifiedObject, Enumerator};
/// # VM::init();
///
/// let mut array = Array::with_capacity(2);
///
/// array.push(Fixnum::new(1));
/// array.push(Fixnum::new(2));
///
/// let mut iter = array.to_enum();
///
/// // A call to peek_values() returns the next values without progressing the iteration
/// let mut result1 = Array::with_capacity(1);
/// result1.push(Fixnum::new(1));
/// assert_eq!(Ok(result1.dup()), iter.peek_values());
/// assert_eq!(Ok(result1), iter.peek_values());
/// ```
pub fn peek_values(&self) -> Result<Array, AnyException> {
self.protect_send("peek_values", &[])
.map(|v| Array::from(v.value()))
}
/// Rewind the iteration back to the beginning.
///
/// Returns [`Err`] when iteration is finished.
///
/// # Examples
///
/// ```
/// use rutie::{Array, Fixnum, Object, VM, VerifiedObject, Enumerator};
/// # VM::init();
///
/// let mut iter = Array::new().push(Fixnum::new(2)).push(Fixnum::new(1)).to_enum();
///
/// // A call to next() returns the next value...
/// assert_eq!(Ok(Fixnum::new(2).to_any_object()), iter.next());
/// assert_eq!(Ok(Fixnum::new(1).to_any_object()), iter.next());
/// assert!(iter.next().is_err(), "not error!");
///
/// iter.rewind();
///
/// // A call to next() returns the next value...
/// assert_eq!(Ok(Fixnum::new(2).to_any_object()), iter.next());
/// assert_eq!(Ok(Fixnum::new(1).to_any_object()), iter.next());
/// assert!(iter.next().is_err(), "not error!");
/// ```
pub fn rewind(&mut self) -> &mut Self {
unsafe { self.send("rewind", &[]) };
self
}
/// Feed a return value back in to internal yield inside enumerator.
///
/// # Examples
///
/// ```
/// use rutie::{Array, Fixnum, Object, VM, VerifiedObject, Enumerator, Class};
/// # VM::init();
///
/// let mut e_iter = VM::eval("[1,2,3].map").unwrap().
/// try_convert_to::<Enumerator>().unwrap();
///
/// assert_eq!(Ok(Fixnum::new(1).to_any_object()), e_iter.next());
/// e_iter.feed(Fixnum::new(999).to_any_object());
/// assert_eq!(Ok(Fixnum::new(2).to_any_object()), e_iter.next());
/// e_iter.feed(Fixnum::new(888).to_any_object());
/// assert_eq!(Ok(Fixnum::new(3).to_any_object()), e_iter.next());
/// e_iter.feed(Fixnum::new(777).to_any_object());
///
/// match e_iter.next() {
/// Ok(_) => unreachable!(),
/// Err(e) => {
/// let mut expected = Array::with_capacity(3);
/// expected.push(Fixnum::new(999).to_any_object());
/// expected.push(Fixnum::new(888).to_any_object());
/// expected.push(Fixnum::new(777).to_any_object());
///
/// assert!(Class::from_existing("StopIteration").case_equals(&e));
/// assert_eq!(expected.to_any_object(), unsafe { e.send("result", &[]) });
/// },
/// }
/// ```
///
/// Ruby:
///
/// ```ruby
/// e = [1,2,3].map
/// p e.next #=> 1
/// e.feed 999
/// p e.next #=> 2
/// e.feed 888
/// p e.next #=> 3
/// e.feed 777
/// begin
/// e.next
/// rescue StopIteration
/// p $!.result #=> [999, 888, 777]
/// end
/// ```
pub fn feed(&mut self, object: AnyObject) -> Result<(), AnyException> {
self.protect_send("feed", &[object]).map(|_| ())
}
}
impl From<Value> for Enumerator {
fn from(value: Value) -> Self {
Enumerator { value }
}
}
impl Into<Value> for Enumerator {
fn into(self) -> Value {
self.value
}
}
impl Into<AnyObject> for Enumerator {
fn into(self) -> AnyObject {
AnyObject::from(self.value)
}
}
impl Object for Enumerator {
#[inline]
fn value(&self) -> Value {
self.value
}
}
impl VerifiedObject for Enumerator {
fn is_correct_type<T: Object>(object: &T) -> bool {
Class::from_existing("Enumerator").case_equals(object)
}
fn error_message() -> &'static str {
"Error converting to Enumerator"
}
}
impl PartialEq for Enumerator {
fn eq(&self, other: &Self) -> bool {
self.equals(other)
}
}