mirror of
https://gitlab.com/news-flash/article_scraper.git
synced 2025-07-07 16:15:32 +02:00
improve title extraction
This commit is contained in:
parent
cce912c354
commit
98c06e11f4
7 changed files with 107 additions and 54 deletions
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@ -11,7 +11,7 @@ pub static BYLINE: Lazy<Regex> = Lazy::new(|| {
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});
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pub static NORMALIZE: Lazy<Regex> =
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Lazy::new(|| Regex::new(r#"/\s{2,}/g"#).expect("NORMALIZE regex"));
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pub static TOKENIZE: Lazy<Regex> = Lazy::new(|| Regex::new(r#"/\W+/g"#).expect("TOKENIZE regex"));
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pub static TOKENIZE: Lazy<Regex> = Lazy::new(|| Regex::new(r#"\W+"#).expect("TOKENIZE regex"));
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pub static UNLIELY_CANDIDATES: Lazy<Regex> = Lazy::new(|| {
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Regex::new(r#"/-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i"#).expect("UNLIELY_CANDIDATES regex")
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});
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@ -31,6 +31,14 @@ pub static POSITIVE: Lazy<Regex> = Lazy::new(|| {
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pub static NEGATIVE: Lazy<Regex> =
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Lazy::new(|| Regex::new(r#"/-ad-|hidden|^hid$| hid$| hid |^hid"#).expect("NEGATIVE regex"));
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pub static TITLE_SEPARATOR: Lazy<Regex> =
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Lazy::new(|| Regex::new(r#"[-|\\/>»]"#).expect("TITLE_SEPARATOR regex"));
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pub static TITLE_CUT_END: Lazy<Regex> =
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Lazy::new(|| Regex::new(r#"(.*)[-|\\/>»] .*"#).expect("TITLE_CUT_END regex"));
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pub static WORD_COUNT: Lazy<Regex> = Lazy::new(|| Regex::new(r#"\s+"#).expect("WORD_COUNT regex"));
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pub static TITLE_CUT_FRONT: Lazy<Regex> =
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Lazy::new(|| Regex::new(r#"/[^-|\\/>»]*[-|\\/>»](.*)/gi"#).expect("TITLE_CUT_FRONT regex"));
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pub const SCORE_ATTR: &str = "content_score";
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pub const MINIMUM_TOPCANDIDATES: usize = 3;
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pub const UNLIKELY_ROLES: &[&str] = &[
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@ -1,5 +1,5 @@
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use super::config::ConfigEntry;
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use crate::{article::Article, util::Util};
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use crate::{article::Article, constants, util::Util};
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use chrono::{DateTime, Utc};
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use libxml::xpath::Context;
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use log::{debug, warn};
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@ -8,14 +8,27 @@ use std::str::FromStr;
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pub fn extract(
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context: &Context,
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config: Option<&ConfigEntry>,
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global_config: &ConfigEntry,
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global_config: Option<&ConfigEntry>,
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article: &mut Article,
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) {
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if article.title.is_none() {
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article.title = extract_title(context, config, global_config).map(|title| {
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match escaper::decode_html(&title) {
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article.title = extract_title(context, config, global_config)
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.map(|title| match escaper::decode_html(&title) {
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Ok(escaped_title) => escaped_title,
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Err(_error) => title,
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})
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.map(|title| {
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// clean titles that contain separators
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if constants::TITLE_SEPARATOR.is_match(&title) {
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let new_title = constants::TITLE_CUT_END.replace(&title, "$1");
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let word_count = constants::WORD_COUNT.split(&title).count();
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if word_count < 3 {
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constants::TITLE_CUT_FRONT.replace(&title, "$1").to_string()
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} else {
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new_title.to_string()
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}
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} else {
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title
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}
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});
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}
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@ -38,7 +51,7 @@ pub fn extract(
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fn extract_title(
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context: &Context,
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config: Option<&ConfigEntry>,
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global_config: &ConfigEntry,
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global_config: Option<&ConfigEntry>,
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) -> Option<String> {
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// check site specific config
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if let Some(config) = config {
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@ -51,27 +64,30 @@ fn extract_title(
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}
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// check global config
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if let Some(global_config) = global_config {
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for xpath_title in &global_config.xpath_title {
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if let Ok(title) = Util::extract_value_merge(context, xpath_title) {
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debug!("Article title: '{}'", title);
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return Some(title);
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}
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}
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}
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// generic meta (readablity)
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get_meta(context, "dc:title")
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Util::extract_value(context, "//title")
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.ok()
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.or_else(|| get_meta(context, "dc:title"))
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.or_else(|| get_meta(context, "dcterm:title"))
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.or_else(|| get_meta(context, "og:title"))
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.or_else(|| get_meta(context, "weibo:article:title"))
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.or_else(|| get_meta(context, "weibo:webpage:title"))
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.or_else(|| get_meta(context, "title"))
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.or_else(|| get_meta(context, "twitter:title"))
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}
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fn extract_author(
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context: &Context,
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config: Option<&ConfigEntry>,
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global_config: &ConfigEntry,
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global_config: Option<&ConfigEntry>,
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) -> Option<String> {
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// check site specific config
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if let Some(config) = config {
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@ -84,23 +100,26 @@ fn extract_author(
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}
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// check global config
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if let Some(global_config) = global_config {
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for xpath_author in &global_config.xpath_author {
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if let Ok(author) = Util::extract_value(context, xpath_author) {
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debug!("Article author: '{}'", author);
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return Some(author);
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}
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}
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}
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// generic meta (readablity)
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get_meta(context, "dc:creator")
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Util::extract_value(context, "//author")
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.ok()
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.or_else(|| get_meta(context, "dc:creator"))
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.or_else(|| get_meta(context, "dcterm:creator"))
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.or_else(|| get_meta(context, "author"))
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}
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fn extract_date(
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context: &Context,
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config: Option<&ConfigEntry>,
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global_config: &ConfigEntry,
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global_config: Option<&ConfigEntry>,
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) -> Option<DateTime<Utc>> {
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// check site specific config
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if let Some(config) = config {
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@ -117,6 +136,7 @@ fn extract_date(
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}
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// check global config
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if let Some(global_config) = global_config {
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for xpath_date in &global_config.xpath_date {
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if let Ok(date_string) = Util::extract_value(context, xpath_date) {
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debug!("Article date: '{}'", date_string);
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@ -127,6 +147,7 @@ fn extract_date(
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}
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}
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}
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}
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None
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}
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@ -174,7 +174,7 @@ impl FullTextParser {
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}
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}
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metadata::extract(&xpath_ctx, config, global_config, article);
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metadata::extract(&xpath_ctx, config, Some(global_config), article);
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if article.thumbnail_url.is_none() {
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Self::check_for_thumbnail(&xpath_ctx, article);
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}
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@ -182,7 +182,8 @@ impl FullTextParser {
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let found_body = Self::extract_body(&xpath_ctx, root, config, global_config)?;
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if !found_body {
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if let Err(error) = Readability::extract_body(document, root) {
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if let Err(error) = Readability::extract_body(document, root, article.title.as_deref())
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{
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log::error!("Both ftr and readability failed to find content: {}", error);
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return Err(error);
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}
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@ -246,7 +247,7 @@ impl FullTextParser {
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let html = Self::download(url, client, headers).await?;
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let document = Self::parse_html(&html, config, global_config)?;
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let xpath_ctx = Self::get_xpath_ctx(&document)?;
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metadata::extract(&xpath_ctx, config, global_config, article);
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metadata::extract(&xpath_ctx, config, Some(global_config), article);
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Self::check_for_thumbnail(&xpath_ctx, article);
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Self::strip_junk(&xpath_ctx, config, global_config, url);
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Self::extract_body(&xpath_ctx, root, config, global_config)?;
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@ -1,4 +1,3 @@
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mod constants;
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mod state;
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#[cfg(test)]
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@ -10,11 +9,16 @@ use libxml::tree::{node, Document, Node, NodeType};
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use self::state::State;
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use super::error::FullTextParserError;
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use crate::constants;
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pub struct Readability;
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impl Readability {
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pub fn extract_body(document: Document, root: &mut Node) -> Result<bool, FullTextParserError> {
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pub fn extract_body(
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document: Document,
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root: &mut Node,
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title: Option<&str>,
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) -> Result<bool, FullTextParserError> {
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node::set_node_rc_guard(6);
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let mut state = State::default();
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@ -49,7 +53,9 @@ impl Readability {
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continue;
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}
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if state.should_remove_title_header && Self::header_duplicates_title(node_ref) {
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if state.should_remove_title_header
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&& Self::header_duplicates_title(node_ref, title)
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{
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state.should_remove_title_header = false;
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node = Self::remove_and_next(node_ref);
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continue;
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@ -278,7 +284,8 @@ impl Readability {
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constants::MINIMUM_TOPCANDIDATES,
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);
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for ancestor in alternative_candidate_ancestors.iter().take(tmp) {
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lists_containing_this_ancestor += if ancestor == parent { 1 } else { 0 };
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lists_containing_this_ancestor +=
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if ancestor == parent { 1 } else { 0 };
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}
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if lists_containing_this_ancestor >= constants::MINIMUM_TOPCANDIDATES {
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@ -668,13 +675,18 @@ impl Readability {
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// Check if this node is an H1 or H2 element whose content is mostly
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// the same as the article title.
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fn header_duplicates_title(node: &Node) -> bool {
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fn header_duplicates_title(node: &Node, title: Option<&str>) -> bool {
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let name = node.get_name().to_lowercase();
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if name != "h1" && name != "h2" {
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return false;
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}
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let heading = Self::get_inner_text(node, false);
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Self::text_similarity(&heading, "Get your Frontend JavaScript Code Covered") > 0.75
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if let Some(title) = title {
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Self::text_similarity(&heading, title) > 0.75
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} else {
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false
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}
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}
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fn get_inner_text(node: &Node, normalize_spaces: bool) -> String {
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@ -695,18 +707,12 @@ impl Readability {
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return 0.0;
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}
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let tokens_b_total: f64 = tokens_b
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.iter()
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.map(|t| t.len())
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.fold(0.0, |a, b| a + b as f64);
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let tokens_b_total = tokens_b.join(" ").len() as f64;
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let uniq_tokens_b = tokens_b
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.into_iter()
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.filter(|token| !tokens_a.iter().any(|t| t == token))
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.collect::<Vec<_>>();
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let uniq_tokens_b_total: f64 = uniq_tokens_b
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.iter()
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.map(|t| t.len())
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.fold(0.0, |a, b| a + b as f64);
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let uniq_tokens_b_total = uniq_tokens_b.join(" ").len() as f64;
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let distance_b = uniq_tokens_b_total / tokens_b_total;
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1.0 - distance_b
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@ -1,17 +1,30 @@
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use libxml::tree::{Document, Node};
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use libxml::{
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tree::{Document, Node},
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xpath::Context,
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};
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use reqwest::Url;
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use crate::full_text_parser::config::ConfigEntry;
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use crate::{
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article::Article,
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full_text_parser::{config::ConfigEntry, metadata},
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};
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async fn prepare(html: &str, url: &Url) -> Document {
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async fn prepare(html: &str, url: &Url) -> (Document, Context, Article) {
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let empty_config = ConfigEntry::default();
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let document = crate::FullTextParser::parse_html(html, None, &empty_config).unwrap();
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let xpath_ctx = crate::FullTextParser::get_xpath_ctx(&document).unwrap();
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crate::FullTextParser::strip_junk(&xpath_ctx, None, &empty_config, url);
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document
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let article = Article {
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title: None,
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author: None,
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url: url.clone(),
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date: None,
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thumbnail_url: None,
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document: None,
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};
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(document, xpath_ctx, article)
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}
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#[tokio::test]
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async fn test_1() {
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let _ = env_logger::builder().is_test(true).try_init();
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@ -19,9 +32,11 @@ async fn test_1() {
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let html = std::fs::read_to_string(r"./resources/tests/readability-test-1.html")
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.expect("Failed to read HTML");
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let url = Url::parse("http://google.com").unwrap();
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let document = prepare(&html, &url).await;
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let (document, xpath_ctx, mut article) = prepare(&html, &url).await;
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let mut root = Node::new("article", None, &document).unwrap();
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super::Readability::extract_body(document, &mut root).unwrap();
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metadata::extract(&xpath_ctx, None, None, &mut article);
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super::Readability::extract_body(document, &mut root, article.title.as_deref()).unwrap();
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}
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@ -145,7 +145,8 @@ impl ImageDownloader {
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}
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let small_image_base64 = base64::engine::general_purpose::STANDARD.encode(&small_image);
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let big_image_base64 = big_image.map(|img| base64::engine::general_purpose::STANDARD.encode(img));
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let big_image_base64 =
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big_image.map(|img| base64::engine::general_purpose::STANDARD.encode(img));
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let small_image_string =
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format!("data:{};base64,{}", content_type_small, small_image_base64);
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let big_image_string = match big_image_base64 {
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@ -1,4 +1,5 @@
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mod article;
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mod constants;
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mod error;
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mod full_text_parser;
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pub mod images;
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