77 lines
2.5 KiB
Rust
77 lines
2.5 KiB
Rust
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use cosmic_text::{Attrs, Family, Style, Weight};
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use syntect::{
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easy::HighlightLines,
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highlighting::{FontStyle, ThemeSet},
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parsing::SyntaxSet,
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util::LinesWithEndings,
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};
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use crate::components::interface::render_error::RenderError;
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pub struct Highlight {
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content: String,
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language: Option<String>,
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extension: Option<String>,
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font_family: String,
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}
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pub type HighlightResult<'a> = Vec<(&'a str, Attrs<'a>)>;
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impl Highlight {
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pub fn new(
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content: String,
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font_family: String,
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language: Option<String>,
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extension: Option<String>,
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) -> Highlight {
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Highlight {
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content,
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language,
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extension,
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font_family,
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}
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}
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pub fn parse(
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&self,
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theme_folder: &str,
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theme: &str,
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) -> Result<Vec<(&str, Attrs)>, RenderError> {
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let syntax_set = SyntaxSet::load_defaults_newlines();
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let theme_set = ThemeSet::load_from_folder(theme_folder)
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.map_err(|_| RenderError::HighlightThemeLoadFailed)?;
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let syntax = match &self.extension {
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Some(extension) => syntax_set
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.find_syntax_by_extension(extension)
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.ok_or(RenderError::HighlightCodeFailed(extension.to_owned())),
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None => {
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let language = &self.language.clone().unwrap_or("Rust".to_string());
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syntax_set
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.find_syntax_by_name(language)
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.ok_or(RenderError::HighlightCodeFailed(language.to_owned()))
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}
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}?;
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let mut highlight = HighlightLines::new(syntax, &theme_set.themes[theme]);
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let attrs = Attrs::new().family(Family::Name(self.font_family.as_ref()));
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Ok(LinesWithEndings::from(&self.content)
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.map(|line| highlight.highlight_line(line, &syntax_set).unwrap())
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.fold(vec![], |acc, cur| [acc, cur].concat())
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.into_iter()
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.map(move |(style, str)| {
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let syntect::highlighting::Color { r, g, b, a: _ } = style.foreground;
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let attrs = match style.font_style {
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FontStyle::BOLD => attrs.weight(Weight::BOLD),
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FontStyle::ITALIC => attrs.style(Style::Italic),
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FontStyle::UNDERLINE => attrs.style(Style::Normal),
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_ => attrs,
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};
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(str, attrs.color(cosmic_text::Color::rgb(r, g, b)))
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})
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.collect::<HighlightResult>())
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}
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}
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