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Parsing for [`/groups`](https://tildes.net/groups). + +use {color_eyre::Result, scraper::Html}; + +use crate::{ + regexes::{DUPLICATE_WHITESPACE_RE, GROUP_LIST_ACTIVITY_RE}, + selectors::{GROUP_LINK, GROUP_LIST_ACTIVITY, GROUP_LIST_DESCRIPTION}, + utilities::{parse_regex_match, select_first_element_text, selector}, +}; + +/// The group list from the [`/groups`](https://tildes.net/groups) page. +#[derive(Debug)] +pub struct GroupList { + /// All group summaries found. + pub summaries: Vec, +} + +/// The representation of a group on the [`/groups`](https://tildes.net/groups) +/// page. +#[derive(Debug)] +pub struct GroupListSummary { + /// The approximate daily comment activity. + pub comment_activity: Option, + + /// The group description. + pub description: Option, + + /// The group name, including leading tilde. + pub name: String, + + /// The approximate daily topic activity. + pub topic_activity: Option, +} + +impl GroupList { + /// Parses a [`GroupList`] from a [`scraper::Html`] tree. + pub fn from_html(html: &Html) -> Result { + let summaries = html + .select(&selector(".group-list li")) + .map(|parent| { + let activity_counts = { + let activity_text = + select_first_element_text(parent, &GROUP_LIST_ACTIVITY) + .unwrap_or_default(); + + GROUP_LIST_ACTIVITY_RE + .captures(&DUPLICATE_WHITESPACE_RE.replace_all(&activity_text, " ")) + .map(|captures| { + ( + parse_regex_match(captures.name("comment")), + parse_regex_match(captures.name("topic")), + ) + }) + .unwrap_or_default() + }; + + GroupListSummary { + comment_activity: activity_counts.0, + description: select_first_element_text( + parent, + &GROUP_LIST_DESCRIPTION, + ), + name: select_first_element_text(parent, &GROUP_LINK).unwrap(), + topic_activity: activity_counts.1, + } + }) + .collect(); + + Ok(Self { summaries }) + } +} diff --git a/source/lib.rs b/source/lib.rs new file mode 100644 index 0000000..707305e --- /dev/null +++ b/source/lib.rs @@ -0,0 +1,29 @@ +// Copyright (C) 2022 Bauke +// +// This program is free software: you can redistribute it and/or modify it under +// the terms of the GNU Affero General Public License as published by the Free +// Software Foundation, either version 3 of the License, or (at your option) any +// later version. +// +// This program is distributed in the hope that it will be useful, but WITHOUT +// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS +// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more +// details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . + +//! # Tildes Parser +//! +//! > **Consolidated parsing for Tildes.net HTML.** + +#![forbid(unsafe_code)] +#![warn(missing_docs, clippy::missing_docs_in_private_items)] + +pub mod regexes; +pub mod selectors; +pub mod utilities; + +pub(crate) mod group_list; + +pub use group_list::{GroupList, GroupListSummary}; diff --git a/source/regexes.rs b/source/regexes.rs new file mode 100644 index 0000000..e88f491 --- /dev/null +++ b/source/regexes.rs @@ -0,0 +1,24 @@ +//! All regular expressions used in parsing. + +use {lazy_static::lazy_static, regex::Regex}; + +lazy_static! { + /// Regular expression for replacing duplicate whitespace. + /// + /// ```rust + /// use tildes_parser::regexes::DUPLICATE_WHITESPACE_RE; + /// + /// let text = DUPLICATE_WHITESPACE_RE.replace_all("example\n text", " "); + /// assert_eq!("example text", text); + /// ``` + pub static ref DUPLICATE_WHITESPACE_RE: Regex = Regex::new(r"\s\s+").unwrap(); + + /// Regular expression for extracting group list activity text. + pub static ref GROUP_LIST_ACTIVITY_RE: Regex = { + Regex::new(concat!( + r"activity: ", + r"(?P\d+) topics?, ", + r"(?P\d+) comments?", + )).unwrap() + }; +} diff --git a/source/selectors.rs b/source/selectors.rs new file mode 100644 index 0000000..5c453dd --- /dev/null +++ b/source/selectors.rs @@ -0,0 +1,16 @@ +//! All [`Selector`]s used in parsing. + +use {lazy_static::lazy_static, scraper::Selector}; + +use crate::utilities::selector; + +lazy_static! { + /// Selector for links to Tildes groups. + pub static ref GROUP_LINK: Selector = selector(".link-group"); + + /// Selector for the activity section in group list items. + pub static ref GROUP_LIST_ACTIVITY: Selector = selector(".group-list-activity"); + + /// Selector for the description section in group list items. + pub static ref GROUP_LIST_DESCRIPTION: Selector = selector(".group-list-description"); +} diff --git a/source/utilities.rs b/source/utilities.rs new file mode 100644 index 0000000..71aa14e --- /dev/null +++ b/source/utilities.rs @@ -0,0 +1,30 @@ +//! Miscellaneous parsing utilities. + +use std::str::FromStr; + +use { + regex::Match, + scraper::{ElementRef, Selector}, +}; + +/// Shorthand to parse a [`regex::Match`] with [`std::str::FromStr`]. +pub fn parse_regex_match(regex_match: Option) -> Option { + regex_match.and_then(|regex_match| regex_match.as_str().parse::().ok()) +} + +/// Returns the text of the first found element inside the given `parent` +/// element. +pub fn select_first_element_text( + parent: ElementRef, + selector: &Selector, +) -> Option { + parent + .select(selector) + .next() + .map(|element| element.text().collect()) +} + +/// Shorthand for creating a [`scraper::Selector`]. +pub fn selector(selector: &str) -> Selector { + Selector::parse(selector).unwrap() +} diff --git a/tests/group_list.rs b/tests/group_list.rs new file mode 100644 index 0000000..7acbe1d --- /dev/null +++ b/tests/group_list.rs @@ -0,0 +1,11 @@ +use std::fs::read_to_string; + +use {insta::assert_debug_snapshot, scraper::Html, tildes_parser::GroupList}; + +#[test] +fn test_group_list_parsing() { + let html = read_to_string("tests/samples/group_list.html").unwrap(); + let html = Html::parse_document(&html); + let group_list = GroupList::from_html(&html).unwrap(); + assert_debug_snapshot!(group_list); +} diff --git a/tests/samples/group_list.html b/tests/samples/group_list.html new file mode 100644 index 0000000..6a9d11a --- /dev/null +++ b/tests/samples/group_list.html @@ -0,0 +1,28 @@ + + + + + Sample for group_list.rs + + + +
+
    +
  1. + ~test.description + - + Test group with description. +
    + Approx. daily activity: + 1 topic, + 2 comments + +
    2. +
  2. + ~test +
    3. +
+
+ + + diff --git a/tests/snapshots/group_list__group_list_parsing.snap b/tests/snapshots/group_list__group_list_parsing.snap new file mode 100644 index 0000000..9b7b278 --- /dev/null +++ b/tests/snapshots/group_list__group_list_parsing.snap @@ -0,0 +1,26 @@ +--- +source: tests/group_list.rs +expression: group_list +--- +GroupList { + summaries: [ + GroupListSummary { + comment_activity: Some( + 2, + ), + description: Some( + "Test group with description.", + ), + name: "~test.description", + topic_activity: Some( + 1, + ), + }, + GroupListSummary { + comment_activity: None, + description: None, + name: "~test", + topic_activity: None, + }, + ], +}