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
use sxd_document::QName;
use std::collections::HashMap;
use std::iter;
use ::{Value, OwnedQName};
use ::nodeset::{Node, OrderedNodes};
use ::function;
type Functions = HashMap<OwnedQName, Box<function::Function + 'static>>;
type Variables<'d> = HashMap<OwnedQName, Value<'d>>;
type Namespaces = HashMap<String, String>;
pub struct Context<'d> {
functions: Functions,
variables: Variables<'d>,
namespaces: Namespaces,
}
impl<'d> Context<'d> {
pub fn new() -> Self {
let mut context = Self::without_core_functions();
function::register_core_functions(&mut context);
context
}
pub fn without_core_functions() -> Self {
Context {
functions: Default::default(),
variables: Default::default(),
namespaces: Default::default(),
}
}
pub fn set_function<N, F>(&mut self, name: N, function: F)
where N: Into<OwnedQName>,
F: function::Function + 'static,
{
self.functions.insert(name.into(), Box::new(function));
}
pub fn set_variable<N, V>(&mut self, name: N, value: V)
where N: Into<OwnedQName>,
V: Into<Value<'d>>,
{
self.variables.insert(name.into(), value.into());
}
pub fn set_namespace(&mut self, prefix: &str, uri: &str) {
self.namespaces.insert(prefix.into(), uri.into());
}
}
impl<'d> Default for Context<'d> {
fn default() -> Self {
Context::new()
}
}
#[derive(Copy, Clone)]
pub struct Evaluation<'c, 'd: 'c> {
pub node: Node<'d>,
pub position: usize,
pub size: usize,
functions: &'c Functions,
variables: &'c Variables<'d>,
namespaces: &'c Namespaces,
}
impl<'c, 'd> Evaluation<'c, 'd> {
pub fn new(context: &'c Context<'d>, node: Node<'d>) -> Evaluation<'c, 'd> {
Evaluation {
node: node,
functions: &context.functions,
variables: &context.variables,
namespaces: &context.namespaces,
position: 1,
size: 1,
}
}
pub fn new_context_for<N>(&self, node: N) -> Evaluation<'c, 'd>
where N: Into<Node<'d>>
{
Evaluation {
node: node.into(),
.. *self
}
}
pub fn function_for_name(&self, name: QName) -> Option<&'c function::Function> {
let name = name.into();
self.functions.get(&name).map(AsRef::as_ref)
}
pub fn value_of(&self, name: QName) -> Option<&Value<'d>> {
let name = name.into();
self.variables.get(&name)
}
pub fn namespace_for(&self, prefix: &str) -> Option<&str> {
self.namespaces.get(prefix).map(String::as_str)
}
pub fn new_contexts_for(self, nodes: OrderedNodes<'d>) -> EvaluationNodesetIter<'c, 'd> {
let sz = nodes.size();
EvaluationNodesetIter {
parent: self,
nodes: Vec::from(nodes).into_iter().enumerate(),
size: sz,
}
}
}
pub struct EvaluationNodesetIter<'c, 'd: 'c> {
parent: Evaluation<'c, 'd>,
nodes: iter::Enumerate<::std::vec::IntoIter<Node<'d>>>,
size: usize,
}
impl<'c, 'd> Iterator for EvaluationNodesetIter<'c, 'd> {
type Item = Evaluation<'c, 'd>;
fn next(&mut self) -> Option<Evaluation<'c, 'd>> {
self.nodes.next().map(|(idx, node)| {
Evaluation {
node: node,
position: idx + 1,
size: self.size,
.. self.parent
}
})
}
}