Most of getting completion documentation resolved & cached MD parsing
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12 changed files with 217 additions and 76 deletions
284
crates/language/src/markdown.rs
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284
crates/language/src/markdown.rs
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use std::ops::Range;
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use std::sync::Arc;
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use crate::{Language, LanguageRegistry};
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use futures::FutureExt;
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use gpui::{
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elements::Text,
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fonts::{HighlightStyle, Underline, Weight},
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platform::{CursorStyle, MouseButton},
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CursorRegion, MouseRegion, ViewContext,
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};
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use pulldown_cmark::{CodeBlockKind, Event, Options, Parser, Tag};
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#[derive(Debug, Clone)]
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pub struct RenderedMarkdown {
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text: String,
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highlights: Vec<(Range<usize>, HighlightStyle)>,
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region_ranges: Vec<Range<usize>>,
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regions: Vec<RenderedRegion>,
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}
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// impl RenderedMarkdown {
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// pub fn render(&self, style: &theme::Editor, cx: &mut ViewContext<Editor>) -> Text {
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// let code_span_background_color = style.document_highlight_read_background;
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// let view_id = cx.view_id();
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// let mut region_id = 0;
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// Text::new(text, style.text.clone())
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// .with_highlights(highlights)
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// .with_custom_runs(region_ranges, move |ix, bounds, scene, _| {
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// region_id += 1;
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// let region = regions[ix].clone();
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// if let Some(url) = region.link_url {
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// scene.push_cursor_region(CursorRegion {
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// bounds,
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// style: CursorStyle::PointingHand,
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// });
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// scene.push_mouse_region(
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// MouseRegion::new::<Editor>(view_id, region_id, bounds)
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// .on_click::<Editor, _>(MouseButton::Left, move |_, _, cx| {
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// cx.platform().open_url(&url)
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// }),
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// );
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// }
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// if region.code {
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// scene.push_quad(gpui::Quad {
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// bounds,
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// background: Some(code_span_background_color),
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// border: Default::default(),
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// corner_radii: (2.0).into(),
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// });
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// }
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// })
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// .with_soft_wrap(true)
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// }
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// }
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#[derive(Debug, Clone)]
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pub struct RenderedRegion {
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pub code: bool,
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pub link_url: Option<String>,
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}
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pub fn render_markdown(
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markdown: &str,
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language_registry: &Arc<LanguageRegistry>,
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language: &Option<Arc<Language>>,
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style: &theme::Editor,
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) -> RenderedMarkdown {
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let mut text = String::new();
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let mut highlights = Vec::new();
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let mut region_ranges = Vec::new();
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let mut regions = Vec::new();
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render_markdown_block(
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markdown,
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language_registry,
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language,
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style,
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&mut text,
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&mut highlights,
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&mut region_ranges,
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&mut regions,
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);
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RenderedMarkdown {
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text,
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highlights,
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region_ranges,
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regions,
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}
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}
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pub fn render_markdown_block(
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markdown: &str,
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language_registry: &Arc<LanguageRegistry>,
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language: &Option<Arc<Language>>,
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style: &theme::Editor,
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text: &mut String,
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highlights: &mut Vec<(Range<usize>, HighlightStyle)>,
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region_ranges: &mut Vec<Range<usize>>,
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regions: &mut Vec<RenderedRegion>,
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) {
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let mut bold_depth = 0;
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let mut italic_depth = 0;
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let mut link_url = None;
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let mut current_language = None;
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let mut list_stack = Vec::new();
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for event in Parser::new_ext(&markdown, Options::all()) {
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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 let Some(language) = ¤t_language {
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render_code(text, highlights, t.as_ref(), language, style);
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} else {
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text.push_str(t.as_ref());
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let mut style = HighlightStyle::default();
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if bold_depth > 0 {
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style.weight = Some(Weight::BOLD);
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}
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if italic_depth > 0 {
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style.italic = Some(true);
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}
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if let Some(link_url) = link_url.clone() {
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region_ranges.push(prev_len..text.len());
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regions.push(RenderedRegion {
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link_url: Some(link_url),
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code: false,
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});
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style.underline = Some(Underline {
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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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if style != HighlightStyle::default() {
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let mut new_highlight = true;
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if let Some((last_range, last_style)) = highlights.last_mut() {
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if last_range.end == prev_len && last_style == &style {
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last_range.end = text.len();
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new_highlight = false;
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}
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}
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if new_highlight {
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highlights.push((prev_len..text.len(), style));
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}
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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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region_ranges.push(prev_len..text.len());
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if link_url.is_some() {
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highlights.push((
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prev_len..text.len(),
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HighlightStyle {
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underline: Some(Underline {
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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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));
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}
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regions.push(RenderedRegion {
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code: true,
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link_url: link_url.clone(),
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});
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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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current_language = if let CodeBlockKind::Fenced(language) = kind {
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language_registry
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.language_for_name(language.as_ref())
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.now_or_never()
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.and_then(Result::ok)
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} else {
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language.clone()
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}
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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::Link(_, url, _) => link_url = Some(url.to_string()),
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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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Tag::Heading(_, _, _) => bold_depth -= 1,
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Tag::CodeBlock(_) => current_language = None,
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Tag::Emphasis => italic_depth -= 1,
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Tag::Strong => bold_depth -= 1,
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Tag::Link(_, _, _) => link_url = None,
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Tag::List(_) => drop(list_stack.pop()),
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_ => {}
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},
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Event::HardBreak => text.push('\n'),
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Event::SoftBreak => text.push(' '),
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_ => {}
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}
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}
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}
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pub fn render_code(
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text: &mut String,
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highlights: &mut Vec<(Range<usize>, HighlightStyle)>,
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content: &str,
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language: &Arc<Language>,
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style: &theme::Editor,
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) {
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let prev_len = text.len();
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text.push_str(content);
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for (range, highlight_id) in language.highlight_text(&content.into(), 0..content.len()) {
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if let Some(style) = highlight_id.style(&style.syntax) {
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highlights.push((prev_len + range.start..prev_len + range.end, style));
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}
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}
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}
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pub fn new_paragraph(text: &mut String, list_stack: &mut Vec<(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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