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
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

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

/// Cast integer to string: `42 cast as string`.
#[test]
fn cast_integer_to_string() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse("42 cast as string").unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::String(String::from("42")))
    );
}

/// Cast string to integer: `"123" cast as integer`.
#[test]
fn cast_string_to_integer() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#""123" cast as integer"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(123))
    );
}

/// Cast integer to double: `42 cast as double`.
#[test]
fn cast_integer_to_double() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse("42 cast as double").unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Double(OrderedFloat(42.0)))
    );
}

/// Cast boolean to integer: `(1 > 0) cast as integer` (true → 1).
#[test]
fn cast_boolean_to_integer() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse("(1 > 0) cast as integer").unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(1))
    );
}

/// Cast string to boolean: `"true" cast as boolean`.
#[test]
fn cast_string_to_boolean() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#""true" cast as boolean"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Boolean(true))
    );
}

/// Cast with `?` and empty sequence should return empty.
#[test]
fn cast_empty_with_question_mark() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse("//nonexistent cast as integer?").unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 0);
}

/// Invalid cast should error: `"abc" cast as integer`.
#[test]
fn cast_invalid_string_to_integer_fails() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse(r#""abc" cast as integer"#).unwrap();

    let result = xpath.apply(&document);
    assert!(result.is_err());
}

/// No cast clause — just return the base expression.
#[test]
fn cast_no_clause_returns_base() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath = xpath::parse("42").unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(42))
    );
}

/// Cast with URI-qualified type name: `42 cast as Q{http://www.w3.org/2001/XMLSchema}string`.
#[test]
fn cast_uri_qualified_string() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath =
        xpath::parse(r#"42 cast as Q{http://www.w3.org/2001/XMLSchema}string"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::String(String::from("42")))
    );
}

/// Cast with URI-qualified type name to integer: `"99" cast as Q{http://www.w3.org/2001/XMLSchema}integer`.
#[test]
fn cast_uri_qualified_integer() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath =
        xpath::parse(r#""99" cast as Q{http://www.w3.org/2001/XMLSchema}integer"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Integer(99))
    );
}

/// Cast with URI-qualified type name to double: `42 cast as Q{http://www.w3.org/2001/XMLSchema}double`.
#[test]
fn cast_uri_qualified_double() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath =
        xpath::parse(r#"42 cast as Q{http://www.w3.org/2001/XMLSchema}double"#).unwrap();

    let items = xpath.apply(&document).unwrap();
    assert_eq!(items.len(), 1);
    assert_eq!(
        items[0],
        XpathItem::AnyAtomicType(AnyAtomicType::Double(OrderedFloat(42.0)))
    );
}

/// Cast with unsupported URI namespace should error.
#[test]
fn cast_uri_qualified_unsupported_namespace_fails() {
    let text = r#"<html><body></body></html>"#;

    let document = html::parse(text).unwrap();
    let xpath =
        xpath::parse(r#"42 cast as Q{http://example.com/types}string"#).unwrap();

    let result = xpath.apply(&document);
    assert!(result.is_err());
}