72 lines
2.0 KiB
Rust
72 lines
2.0 KiB
Rust
//! Parsing for [`/groups`](https://tildes.net/groups).
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use {color_eyre::Result, scraper::Html};
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use crate::{
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regexes::{DUPLICATE_WHITESPACE_RE, GROUP_LIST_ACTIVITY_RE},
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selectors::{GROUP_LINK, GROUP_LIST_ACTIVITY, GROUP_LIST_DESCRIPTION},
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utilities::{parse_regex_match, select_first_element_text, selector},
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};
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/// The group list from the [`/groups`](https://tildes.net/groups) page.
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#[derive(Debug)]
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pub struct GroupList {
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/// All group summaries found.
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pub summaries: Vec<GroupListSummary>,
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}
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/// The representation of a group on the [`/groups`](https://tildes.net/groups)
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/// page.
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#[derive(Debug)]
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pub struct GroupListSummary {
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/// The approximate daily comment activity.
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pub comment_activity: Option<i32>,
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/// The group description.
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pub description: Option<String>,
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/// The group name, including leading tilde.
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pub name: String,
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/// The approximate daily topic activity.
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pub topic_activity: Option<i32>,
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}
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impl GroupList {
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/// Parses a [`GroupList`] from a [`scraper::Html`] tree.
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pub fn from_html(html: &Html) -> Result<Self> {
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let summaries = html
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.select(&selector(".group-list li"))
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.map(|parent| {
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let activity_counts = {
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let activity_text =
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select_first_element_text(parent, &GROUP_LIST_ACTIVITY)
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.unwrap_or_default();
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GROUP_LIST_ACTIVITY_RE
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.captures(&DUPLICATE_WHITESPACE_RE.replace_all(&activity_text, " "))
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.map(|captures| {
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(
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parse_regex_match(captures.name("comment")),
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parse_regex_match(captures.name("topic")),
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)
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})
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.unwrap_or_default()
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};
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GroupListSummary {
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comment_activity: activity_counts.0,
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description: select_first_element_text(
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parent,
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&GROUP_LIST_DESCRIPTION,
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),
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name: select_first_element_text(parent, &GROUP_LINK).unwrap(),
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topic_activity: activity_counts.1,
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}
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})
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.collect();
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Ok(Self { summaries })
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}
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}
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