489 lines
17 KiB
Rust
489 lines
17 KiB
Rust
use std::ops::Range;
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use std::sync::{Arc, LazyLock};
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use chat::Mention;
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use gpui::{
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AnyElement, App, ElementId, Entity, FontStyle, FontWeight, HighlightStyle, InteractiveText,
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IntoElement, SharedString, StrikethroughStyle, StyledText, UnderlineStyle, Window,
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};
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use person::PersonRegistry;
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use regex::Regex;
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use theme::ActiveTheme;
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/// Matches `http://` and `https://` URLs. Only these are treated as clickable links.
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static WEB_URL: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"(?i)^https?://").unwrap());
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#[allow(clippy::enum_variant_names)]
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Highlight {
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Code,
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InlineCode(bool),
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Highlight(HighlightStyle),
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Mention,
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}
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impl From<HighlightStyle> for Highlight {
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fn from(style: HighlightStyle) -> Self {
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Self::Highlight(style)
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}
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}
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#[derive(Default)]
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pub struct RenderedText {
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pub text: SharedString,
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pub highlights: Vec<(Range<usize>, Highlight)>,
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pub link_ranges: Vec<Range<usize>>,
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pub link_urls: Arc<[String]>,
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}
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impl RenderedText {
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pub fn new(
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content: &str,
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mentions: &[Mention],
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persons: &Entity<PersonRegistry>,
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markdown: bool,
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cx: &App,
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) -> Self {
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Self::render(content, mentions, markdown, |mention| {
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format!("@{}", persons.read(cx).get(&mention.public_key, cx).name())
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})
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}
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fn render(
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content: &str,
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mentions: &[Mention],
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markdown: bool,
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resolve_mention: impl Fn(&Mention) -> String,
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) -> Self {
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let mut text = String::new();
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let mut highlights = Vec::new();
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let mut link_ranges = Vec::new();
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let mut link_urls = Vec::new();
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render_text_mut(
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content,
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mentions,
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&mut text,
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&mut highlights,
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&mut link_ranges,
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&mut link_urls,
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markdown,
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resolve_mention,
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);
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// Trim trailing whitespace and adjust highlight and link ranges.
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let trimmed_len = text.trim_end().len();
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// Retain highlights and link ranges that are within the trimmed text.
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if trimmed_len < text.len() {
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highlights.retain_mut(|(range, _)| {
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range.end = range.end.min(trimmed_len);
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range.start < range.end
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});
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let mut ix = 0;
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while ix < link_ranges.len() {
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let range = &mut link_ranges[ix];
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range.end = range.end.min(trimmed_len);
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if range.start < range.end {
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ix += 1;
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} else {
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link_ranges.remove(ix);
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link_urls.remove(ix);
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}
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}
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text.truncate(trimmed_len);
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}
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RenderedText {
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text: SharedString::from(text),
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link_urls: link_urls.into(),
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link_ranges,
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highlights,
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}
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}
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pub fn element(&self, id: ElementId, window: &Window, cx: &App) -> AnyElement {
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let code_background = cx.theme().elevated_surface_background;
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let color = cx.theme().text_accent;
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let code_font = if cfg!(target_os = "macos") {
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"Menlo"
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} else if cfg!(target_os = "windows") {
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"Consolas"
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} else {
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"monospace"
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};
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InteractiveText::new(
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id,
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StyledText::new(self.text.clone())
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.with_default_highlights(
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&window.text_style(),
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self.highlights.iter().map(|(range, highlight)| {
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(
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range.clone(),
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match highlight {
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Highlight::Code => HighlightStyle {
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background_color: Some(code_background),
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..Default::default()
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},
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Highlight::InlineCode(link) => {
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if *link {
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HighlightStyle {
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background_color: Some(code_background),
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underline: Some(UnderlineStyle {
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thickness: 1.0.into(),
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..Default::default()
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}),
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..Default::default()
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}
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} else {
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HighlightStyle {
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background_color: Some(code_background),
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..Default::default()
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}
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}
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}
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Highlight::Mention => HighlightStyle {
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color: Some(color),
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underline: Some(UnderlineStyle {
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thickness: 1.0.into(),
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..Default::default()
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}),
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..Default::default()
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},
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Highlight::Highlight(highlight) => *highlight,
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},
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)
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}),
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)
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.with_font_family_overrides(self.highlights.iter().filter_map(
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|(range, highlight)| match highlight {
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Highlight::Code | Highlight::InlineCode(_) => {
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Some((range.clone(), code_font.into()))
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}
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_ => None,
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},
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)),
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)
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.on_click(self.link_ranges.clone(), {
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let link_urls = self.link_urls.clone();
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move |ix, _, cx| {
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let url = &link_urls[ix];
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if WEB_URL.is_match(url) {
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cx.open_url(url);
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}
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}
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})
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.into_any_element()
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}
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}
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#[allow(clippy::too_many_arguments)]
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fn render_text_mut(
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block: &str,
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mut mentions: &[Mention],
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text: &mut String,
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highlights: &mut Vec<(Range<usize>, Highlight)>,
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link_ranges: &mut Vec<Range<usize>>,
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link_urls: &mut Vec<String>,
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markdown: bool,
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resolve_mention: impl Fn(&Mention) -> String,
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) {
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use pulldown_cmark::{Event, Options, Parser, Tag, TagEnd};
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let mut bold_depth = 0;
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let mut italic_depth = 0;
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let mut strikethrough_depth = 0;
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let mut link_url = None;
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let mut list_stack = Vec::new();
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let mut code_block = false;
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// Only enable the extensions that make sense for chat messages. Notably this leaves
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// out smart punctuation, tables, math and footnotes: they rewrite or swallow text.
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let events: Box<dyn Iterator<Item = (Event<'_>, Range<usize>)> + '_> = if markdown {
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Box::new(Parser::new_ext(block, Options::ENABLE_STRIKETHROUGH).into_offset_iter())
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} else {
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Box::new(std::iter::once((Event::Text(block.into()), 0..block.len())))
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};
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for (event, source_range) in events {
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let prev_len = text.len();
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match event {
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Event::Text(t) => {
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if code_block {
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text.push_str(t.as_ref());
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highlights.push((prev_len..text.len(), Highlight::Code));
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continue;
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}
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let t_str = t.as_ref();
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let mut last_processed = 0;
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while let Some(mention) = mentions.first() {
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if mention.range.start >= source_range.end {
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break;
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}
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mentions = &mentions[1..];
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if mention.range.start < source_range.start
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|| mention.range.end > source_range.end
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{
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continue;
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}
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let Some(token) = block.get(mention.range.clone()) else {
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continue;
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};
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let Some(offset) = t_str[last_processed..].find(token) else {
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continue;
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};
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let mention_start_in_text = last_processed + offset;
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let mention_end_in_text = mention_start_in_text + token.len();
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// Add text before this mention
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if mention_start_in_text > last_processed {
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let before_mention = &t_str[last_processed..mention_start_in_text];
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process_text_segment(
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before_mention,
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bold_depth,
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italic_depth,
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strikethrough_depth,
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link_url.clone(),
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text,
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highlights,
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link_ranges,
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link_urls,
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);
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}
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// Process the mention replacement
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let replacement_text = resolve_mention(mention);
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let replacement_start = text.len();
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text.push_str(&replacement_text);
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let replacement_end = text.len();
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highlights.push((replacement_start..replacement_end, Highlight::Mention));
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last_processed = mention_end_in_text;
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}
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// Add any remaining text after the last mention
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if last_processed < t_str.len() {
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let remaining_text = &t_str[last_processed..];
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process_text_segment(
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remaining_text,
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bold_depth,
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italic_depth,
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strikethrough_depth,
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link_url.clone(),
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text,
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highlights,
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link_ranges,
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link_urls,
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);
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}
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}
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Event::Code(t) => {
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text.push_str(t.as_ref());
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let is_link = link_url.is_some();
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if let Some(link_url) = link_url.clone() {
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link_ranges.push(prev_len..text.len());
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link_urls.push(link_url);
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}
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highlights.push((prev_len..text.len(), Highlight::InlineCode(is_link)))
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}
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Event::Start(tag) => match tag {
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Tag::Paragraph => new_paragraph(text, &mut list_stack),
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Tag::Heading { .. } => {
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new_paragraph(text, &mut list_stack);
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bold_depth += 1;
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}
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Tag::CodeBlock(_kind) => {
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new_paragraph(text, &mut list_stack);
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code_block = true;
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}
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Tag::Emphasis => italic_depth += 1,
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Tag::Strong => bold_depth += 1,
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Tag::Strikethrough => strikethrough_depth += 1,
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Tag::Link { dest_url, .. } => {
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link_url = WEB_URL.is_match(&dest_url).then(|| dest_url.to_string());
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}
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Tag::List(number) => {
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list_stack.push((number, false));
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}
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Tag::Item => {
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let len = list_stack.len();
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if let Some((list_number, has_content)) = list_stack.last_mut() {
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*has_content = false;
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if !text.is_empty() && !text.ends_with('\n') {
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text.push('\n');
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}
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for _ in 0..len - 1 {
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text.push_str(" ");
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}
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if let Some(number) = list_number {
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text.push_str(&format!("{}. ", number));
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*number += 1;
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*has_content = false;
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} else {
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text.push_str("- ");
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}
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}
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}
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_ => {}
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},
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Event::End(tag) => match tag {
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TagEnd::CodeBlock => code_block = false,
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TagEnd::Heading(_) => bold_depth -= 1,
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TagEnd::Emphasis => italic_depth -= 1,
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TagEnd::Strong => bold_depth -= 1,
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TagEnd::Strikethrough => strikethrough_depth -= 1,
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TagEnd::Link => link_url = None,
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TagEnd::List(_) => drop(list_stack.pop()),
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_ => {}
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},
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Event::Html(t) | Event::InlineHtml(t) => text.push_str(t.as_ref()),
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Event::Rule => {
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new_paragraph(text, &mut list_stack);
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text.push_str("────────\n");
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}
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Event::HardBreak => text.push('\n'),
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Event::SoftBreak => text.push('\n'),
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_ => {}
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}
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}
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}
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#[allow(clippy::too_many_arguments)]
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fn process_text_segment(
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segment: &str,
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bold_depth: i32,
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italic_depth: i32,
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strikethrough_depth: i32,
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link_url: Option<String>,
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text: &mut String,
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highlights: &mut Vec<(Range<usize>, Highlight)>,
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link_ranges: &mut Vec<Range<usize>>,
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link_urls: &mut Vec<String>,
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) {
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// Build the style for this segment
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let mut style = HighlightStyle::default();
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if bold_depth > 0 {
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style.font_weight = Some(FontWeight::BOLD);
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}
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if italic_depth > 0 {
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style.font_style = Some(FontStyle::Italic);
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}
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if strikethrough_depth > 0 {
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style.strikethrough = Some(StrikethroughStyle {
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thickness: 1.0.into(),
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..Default::default()
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});
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}
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// Ranges always refer to the rendered text, including replaced mentions.
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let segment_start = text.len();
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text.push_str(segment);
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let text_end = text.len();
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if let Some(link_url) = link_url {
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// Handle as a markdown link
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link_ranges.push(segment_start..text_end);
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link_urls.push(link_url);
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style.underline = Some(UnderlineStyle {
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thickness: 1.0.into(),
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..Default::default()
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});
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// Add highlight for the entire linked segment
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if style != HighlightStyle::default() {
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highlights.push((segment_start..text_end, Highlight::Highlight(style)));
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}
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} else {
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// Handle link detection within the segment
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let mut finder = linkify::LinkFinder::new();
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finder.kinds(&[linkify::LinkKind::Url]);
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let mut last_link_pos = 0;
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for link in finder
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.links(segment)
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.filter(|link| WEB_URL.is_match(link.as_str()))
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{
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let start = link.start();
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let end = link.end();
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// Add non-link text before this link
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if start > last_link_pos {
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let non_link_start = segment_start + last_link_pos;
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let non_link_end = segment_start + start;
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if style != HighlightStyle::default() {
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highlights.push((non_link_start..non_link_end, Highlight::Highlight(style)));
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}
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}
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// Add the link
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let range = (segment_start + start)..(segment_start + end);
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link_ranges.push(range.clone());
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link_urls.push(link.as_str().to_string());
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// Apply link styling (underline + existing style)
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let mut link_style = style;
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link_style.underline = Some(UnderlineStyle {
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thickness: 1.0.into(),
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..Default::default()
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});
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highlights.push((range, Highlight::Highlight(link_style)));
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last_link_pos = end;
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}
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// Add any remaining text after the last link
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if last_link_pos < segment.len() {
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let remaining_start = segment_start + last_link_pos;
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let remaining_end = segment_start + segment.len();
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if style != HighlightStyle::default() {
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highlights.push((remaining_start..remaining_end, Highlight::Highlight(style)));
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}
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}
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}
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}
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fn new_paragraph(text: &mut String, list_stack: &mut [(Option<u64>, bool)]) {
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let mut is_subsequent_paragraph_of_list = false;
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if let Some((_, has_content)) = list_stack.last_mut() {
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if *has_content {
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is_subsequent_paragraph_of_list = true;
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} else {
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*has_content = true;
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return;
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}
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}
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if !text.is_empty() {
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if !text.ends_with('\n') {
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text.push('\n');
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}
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text.push('\n');
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}
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for _ in 0..list_stack.len().saturating_sub(1) {
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text.push_str(" ");
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}
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if is_subsequent_paragraph_of_list {
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text.push_str(" ");
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}
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}
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