skyscraper 0.7.0

XPath for HTML web scraping
Documentation 
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

use skyscraper::{
    html,
    xpath::{
        self,
        grammar::data_model::{AnyAtomicType, XpathItem},
    },
};

/// Square array constructor with integer lookup.
/// `let $a := [10, 20, 30] return $a(2)` should return 20.
#[test]
fn square_array_lookup() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := [10, 20, 30] return $a(2)"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1, "should return 1 item: {items:?}");
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(20))
    );
}

/// Square array constructor: first element.
#[test]
fn square_array_lookup_first() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := [10, 20, 30] return $a(1)"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1, "should return 1 item: {items:?}");
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(10))
    );
}

/// Square array constructor: last element.
#[test]
fn square_array_lookup_last() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := [10, 20, 30] return $a(3)"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1, "should return 1 item: {items:?}");
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(30))
    );
}

/// Square array with string members.
#[test]
fn square_array_string_members() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath =
        xpath::parse(r#"let $a := ["hello", "world"] return $a(1)"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1, "should return 1 item: {items:?}");
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::String("hello".to_string()))
    );
}

/// Empty square array: out-of-bounds should error.
#[test]
fn square_array_empty_out_of_bounds() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := [] return $a(1)"#).unwrap();

    let result = xpath.apply(&document);
    assert!(
        result.is_err(),
        "out-of-bounds on empty array should error: {result:?}"
    );
}

/// Array index out of bounds should error.
#[test]
fn square_array_index_out_of_bounds() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := [1, 2] return $a(3)"#).unwrap();

    let result = xpath.apply(&document);
    assert!(
        result.is_err(),
        "out-of-bounds index should error: {result:?}"
    );
}

/// Array index 0 should error (1-indexed).
#[test]
fn square_array_index_zero_errors() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := [1, 2] return $a(0)"#).unwrap();

    let result = xpath.apply(&document);
    assert!(result.is_err(), "index 0 should error: {result:?}");
}

/// Curly array constructor: `array { 1, 2, 3 }`.
/// Each item in the sequence becomes one member.
#[test]
fn curly_array_lookup() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath =
        xpath::parse(r#"let $a := array { 1, 2, 3 } return $a(2)"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1, "should return 1 item: {items:?}");
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(2))
    );
}

/// Curly array with empty expression produces empty array.
#[test]
fn curly_array_empty() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#"let $a := array {} return $a(1)"#).unwrap();

    let result = xpath.apply(&document);
    assert!(
        result.is_err(),
        "out-of-bounds on empty curly array should error: {result:?}"
    );
}