pageinfo-rs 0.2.1

CLI tool that analyzes web pages and produces structured LLM-friendly output
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

use dom_content_extraction::scraper::{Html, Selector};
use serde::{Deserialize, Serialize};
use url::Url;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Link {
    pub url: String,
    pub text: Option<String>,
    pub rel: Option<String>,
    pub is_internal: bool,
}

/// Extract all links from an HTML document, resolving relative URLs against
/// the page's base URL.
pub fn extract_links(document: &Html, base_url: &Url) -> Vec<Link> {
    let page_domain = extract_registered_domain(base_url);
    let selector = Selector::parse("a[href]").unwrap();

    document
        .select(&selector)
        .filter_map(|element| {
            let href = element.value().attr("href")?;
            let resolved = base_url.join(href).ok()?;
            let resolved_domain = extract_registered_domain(&resolved);
            let is_internal = match (&page_domain, &resolved_domain) {
                (Some(a), Some(b)) => a == b,
                _ => false,
            };

            let text = element
                .text()
                .collect::<Vec<_>>()
                .join("")
                .trim()
                .to_string();
            let text = if text.is_empty() { None } else { Some(text) };

            Some(Link {
                url: resolved.to_string(),
                text,
                rel: element.value().attr("rel").map(String::from),
                is_internal,
            })
        })
        .collect()
}

/// Extract the registered domain (e.g. "coindesk.com" from "www.coindesk.com").
/// Handles common suffixes like .com, .co.uk, etc. by taking last two or three
/// labels depending on the TLD.
pub fn extract_registered_domain(url: &Url) -> Option<String> {
    let host = url.host_str()?;
    let parts: Vec<&str> = host.split('.').collect();
    if parts.len() < 2 {
        return Some(host.to_string());
    }

    let suffix_len = if is_multi_part_tld(&parts) { 3 } else { 2 };

    if parts.len() < suffix_len {
        return Some(host.to_string());
    }

    let start = parts.len() - suffix_len;
    Some(parts[start..].join("."))
}

fn is_multi_part_tld(parts: &[&str]) -> bool {
    let second_level = match parts.last() {
        Some(&s) => s,
        None => return false,
    };

    matches!(
        second_level,
        "uk" | "au" | "br" | "ca" | "cn" | "de" | "fr" | "in" | "jp" | "nz" | "za"
    ) && parts.len() >= 3
        && matches!(
            parts.get(parts.len() - 2).copied(),
            Some("co" | "com" | "org" | "net" | "gov" | "ac" | "edu")
        )
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn extract_registered_domain_simple() {
        let url = Url::parse("https://example.com/page").unwrap();
        assert_eq!(extract_registered_domain(&url), Some("example.com".into()));
    }

    #[test]
    fn extract_registered_domain_www() {
        let url = Url::parse("https://www.example.com/page").unwrap();
        assert_eq!(extract_registered_domain(&url), Some("example.com".into()));
    }

    #[test]
    fn extract_registered_domain_multi_part_tld() {
        let url = Url::parse("https://www.example.co.uk/page").unwrap();
        assert_eq!(
            extract_registered_domain(&url),
            Some("example.co.uk".into())
        );
    }

    #[test]
    fn extract_registered_domain_multi_part_jp() {
        let url = Url::parse("https://www.example.co.jp/page").unwrap();
        assert_eq!(
            extract_registered_domain(&url),
            Some("example.co.jp".into())
        );
    }

    #[test]
    fn extract_registered_domain_no_host() {
        let url = Url::parse("file:///path/to/file").unwrap();
        assert_eq!(extract_registered_domain(&url), None);
    }

    #[test]
    fn extract_links_basic() {
        let html = r#"<html><body>
            <a href="https://example.com/about">About Us</a>
            <a href="https://other.com/page">External</a>
        </body></html>"#;
        let doc = Html::parse_document(html);
        let base = Url::parse("https://example.com/").unwrap();
        let links = extract_links(&doc, &base);

        assert_eq!(links.len(), 2);
        assert!(links[0].is_internal);
        assert!(!links[1].is_internal);
    }

    #[test]
    fn extract_links_resolves_relative() {
        let html = r#"<html><body>
            <a href="/about">About</a>
            <a href="contact">Contact</a>
        </body></html>"#;
        let doc = Html::parse_document(html);
        let base = Url::parse("https://example.com/").unwrap();
        let links = extract_links(&doc, &base);

        assert_eq!(links[0].url, "https://example.com/about");
        assert_eq!(links[1].url, "https://example.com/contact");
    }

    #[test]
    fn extract_links_text_and_rel() {
        let html = r#"<html><body>
            <a href="https://example.com" rel="nofollow">Click here</a>
        </body></html>"#;
        let doc = Html::parse_document(html);
        let base = Url::parse("https://example.com/").unwrap();
        let links = extract_links(&doc, &base);

        assert_eq!(links[0].text.as_deref(), Some("Click here"));
        assert_eq!(links[0].rel.as_deref(), Some("nofollow"));
    }

    #[test]
    fn extract_links_empty_text() {
        let html = r#"<html><body>
            <a href="https://example.com">  </a>
        </body></html>"#;
        let doc = Html::parse_document(html);
        let base = Url::parse("https://example.com/").unwrap();
        let links = extract_links(&doc, &base);

        assert!(links[0].text.is_none());
    }

    #[test]
    fn extract_links_no_href_ignored() {
        let html = r#"<html><body>
            <a name="anchor">No href</a>
            <a href="https://example.com">Has href</a>
        </body></html>"#;
        let doc = Html::parse_document(html);
        let base = Url::parse("https://example.com/").unwrap();
        let links = extract_links(&doc, &base);

        assert_eq!(links.len(), 1);
    }
}