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path: root/support/texlab/src/features/hover/string_ref.rs
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use lsp_types::{Hover, HoverContents, HoverParams, MarkupContent, MarkupKind};
use rowan::ast::AstNode;

use crate::{
    features::cursor::CursorContext,
    syntax::bibtex::{self, HasName, HasValue},
    LineIndexExt,
};

pub fn find_string_reference_hover(context: &CursorContext<HoverParams>) -> Option<Hover> {
    let main_document = context.request.main_document();
    let data = main_document.data.as_bibtex()?;

    let key = context.cursor.as_bibtex().filter(|token| {
        let parent = token.parent().unwrap();
        (token.kind() == bibtex::NAME && bibtex::Value::can_cast(parent.kind()))
            || (token.kind() == bibtex::NAME && bibtex::StringDef::can_cast(parent.kind()))
    })?;

    for string in bibtex::SyntaxNode::new_root(data.green.clone())
        .children()
        .filter_map(bibtex::StringDef::cast)
    {
        if string
            .name_token()
            .filter(|k| k.text() == key.text())
            .is_some()
        {
            let value = string.value()?.syntax().text().to_string();
            return Some(Hover {
                range: Some(
                    main_document
                        .line_index
                        .line_col_lsp_range(key.text_range()),
                ),
                contents: HoverContents::Markup(MarkupContent {
                    kind: MarkupKind::PlainText,
                    value,
                }),
            });
        }
    }

    None
}

#[cfg(test)]
mod tests {
    use indoc::indoc;
    use lsp_types::Range;

    use crate::{features::testing::FeatureTester, RangeExt};

    use super::*;

    #[test]
    fn test_empty_latex_document() {
        let request = FeatureTester::builder()
            .files(vec![("main.tex", "")])
            .main("main.tex")
            .line(0)
            .character(0)
            .build()
            .hover();

        let context = CursorContext::new(request);
        let actual_hover = find_string_reference_hover(&context);

        assert_eq!(actual_hover, None);
    }

    #[test]
    fn test_empty_bibtex_document() {
        let request = FeatureTester::builder()
            .files(vec![("main.bib", "")])
            .main("main.bib")
            .line(0)
            .character(0)
            .build()
            .hover();

        let context = CursorContext::new(request);
        let actual_hover = find_string_reference_hover(&context);

        assert_eq!(actual_hover, None);
    }

    #[test]
    fn test_inside_reference() {
        let request = FeatureTester::builder()
            .files(vec![(
                "main.bib",
                indoc! { r#"
                    @string{foo = "Foo"}
                    @string{bar = "Bar"}
                    @article{baz, author = bar}
                "# },
            )])
            .main("main.bib")
            .line(2)
            .character(24)
            .build()
            .hover();

        let context = CursorContext::new(request);
        let actual_hover = find_string_reference_hover(&context).unwrap();

        let expected_hover = Hover {
            contents: HoverContents::Markup(MarkupContent {
                kind: MarkupKind::PlainText,
                value: "\"Bar\"".into(),
            }),
            range: Some(Range::new_simple(2, 23, 2, 26)),
        };

        assert_eq!(actual_hover, expected_hover);
    }

    #[test]
    fn test_inside_field() {
        let request = FeatureTester::builder()
            .files(vec![(
                "main.bib",
                indoc! { r#"
                    @string{foo = "Foo"}
                    @string{bar = "Bar"}
                    @article{baz, author = bar}
                "# },
            )])
            .main("main.bib")
            .line(2)
            .character(20)
            .build()
            .hover();

        let context = CursorContext::new(request);
        let actual_hover = find_string_reference_hover(&context);
        assert_eq!(actual_hover, None);
    }
}