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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
///
/// Implementation of the callbacks that the CSS selector engine uses to query the DOM.
///
use std::str::eq_slice;
use newcss::select::SelectHandler;
use script::dom::node::{AbstractNode, LayoutView};
pub struct NodeSelectHandler {
node: AbstractNode<LayoutView>,
}
fn with_node_name<R>(node: AbstractNode<LayoutView>, f: &fn(&str) -> R) -> R {
if !node.is_element() {
fail!(~"attempting to style non-element node");
}
do node.with_imm_element |element_n| {
f(element_n.tag_name)
}
}
impl SelectHandler<AbstractNode<LayoutView>> for NodeSelectHandler {
fn with_node_name<R>(&self, node: &AbstractNode<LayoutView>, f: &fn(&str) -> R) -> R {
with_node_name(*node, f)
}
fn named_parent_node(&self, node: &AbstractNode<LayoutView>, name: &str)
-> Option<AbstractNode<LayoutView>> {
do node.parent_node().chain |parent| {
do with_node_name(parent) |node_name| {
if eq_slice(name, node_name) {
Some(parent)
} else {
None
}
}
}
}
fn parent_node(&self, node: &AbstractNode<LayoutView>) -> Option<AbstractNode<LayoutView>> {
node.parent_node()
}
// TODO: Use a Bloom filter.
fn named_ancestor_node(&self, node: &AbstractNode<LayoutView>, name: &str)
-> Option<AbstractNode<LayoutView>> {
let mut node = *node;
loop {
let parent = node.parent_node();
match parent {
Some(parent) => {
let mut found = false;
do with_node_name(parent) |node_name| {
if eq_slice(name, node_name) {
found = true;
}
}
if found {
return Some(parent);
}
node = parent;
}
None => return None
}
}
}
fn node_is_root(&self, node: &AbstractNode<LayoutView>) -> bool {
self.parent_node(node).is_none()
}
fn node_is_link(&self, node: &AbstractNode<LayoutView>) -> bool {
if node.is_element() {
do node.with_imm_element |element| {
"a" == element.tag_name
}
} else {
false
}
}
fn with_node_classes<R>(&self, node: &AbstractNode<LayoutView>, f: &fn(Option<&str>) -> R) -> R {
if !node.is_element() {
fail!(~"attempting to style non-element node");
}
do node.with_imm_element() |element_n| {
f(element_n.get_attr("class"))
}
}
fn node_has_class(&self, node: &AbstractNode<LayoutView>, class: &str) -> bool {
if !node.is_element() {
fail!(~"attempting to style non-element node");
}
do node.with_imm_element |element_n| {
match element_n.get_attr("class") {
None => false,
Some(existing_classes) => {
let mut ret = false;
for s in existing_classes.split_iter(' ') {
if s == class {
ret = true;
break;
}
}
ret
}
}
}
}
fn with_node_id<R>(&self, node: &AbstractNode<LayoutView>, f: &fn(Option<&str>) -> R) -> R {
if !node.is_element() {
fail!(~"attempting to style non-element node");
}
do node.with_imm_element() |element_n| {
f(element_n.get_attr("id"))
}
}
fn node_has_id(&self, node: &AbstractNode<LayoutView>, id: &str) -> bool {
if !node.is_element() {
fail!(~"attempting to style non-element node");
}
do node.with_imm_element |element_n| {
match element_n.get_attr("id") {
None => false,
Some(existing_id) => id == existing_id
}
}
}
}
|
