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path: root/support/texlab/src/features/highlight/label.rs
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use lsp_types::{DocumentHighlight, DocumentHighlightKind, DocumentHighlightParams};
use rowan::ast::AstNode;

use crate::{features::cursor::CursorContext, syntax::latex, LineIndexExt};

pub fn find_label_highlights(
    context: &CursorContext<DocumentHighlightParams>,
) -> Option<Vec<DocumentHighlight>> {
    let (name_text, _) = context.find_label_name_key()?;

    let main_document = context.request.main_document();
    let data = main_document.data.as_latex()?;

    let mut highlights = Vec::new();
    for node in latex::SyntaxNode::new_root(data.green.clone()).descendants() {
        if let Some(label_name) = latex::LabelDefinition::cast(node.clone())
            .and_then(|label| label.name())
            .and_then(|label_name| label_name.key())
            .filter(|label_name| label_name.to_string() == name_text)
        {
            let range = main_document
                .line_index
                .line_col_lsp_range(latex::small_range(&label_name));

            highlights.push(DocumentHighlight {
                range,
                kind: Some(DocumentHighlightKind::WRITE),
            });
        } else if let Some(label) = latex::LabelReference::cast(node.clone()) {
            for label_name in label
                .name_list()
                .into_iter()
                .flat_map(|name| name.keys())
                .filter(|label_name| label_name.to_string() == name_text)
            {
                let range = main_document
                    .line_index
                    .line_col_lsp_range(latex::small_range(&label_name));

                highlights.push(DocumentHighlight {
                    range,
                    kind: Some(DocumentHighlightKind::READ),
                });
            }
        } else if let Some(label) = latex::LabelReferenceRange::cast(node.clone()) {
            if let Some(label_name) = label
                .from()
                .and_then(|label_name| label_name.key())
                .filter(|label_name| label_name.to_string() == name_text)
            {
                let range = main_document
                    .line_index
                    .line_col_lsp_range(latex::small_range(&label_name));

                highlights.push(DocumentHighlight {
                    range,
                    kind: Some(DocumentHighlightKind::READ),
                });
            }

            if let Some(label_name) = label
                .to()
                .and_then(|label_name| label_name.key())
                .filter(|label_name| label_name.to_string() == name_text)
            {
                let range = main_document
                    .line_index
                    .line_col_lsp_range(latex::small_range(&label_name));

                highlights.push(DocumentHighlight {
                    range,
                    kind: Some(DocumentHighlightKind::READ),
                });
            }
        }
    }

    Some(highlights)
}

#[cfg(test)]
mod tests {
    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()
            .highlight();
        let context = CursorContext::new(request);

        let actual_links = find_label_highlights(&context);

        assert!(actual_links.is_none());
    }

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

        let actual_links = find_label_highlights(&context);

        assert!(actual_links.is_none());
    }

    #[test]
    fn test_label() {
        let tester = FeatureTester::builder()
            .files(vec![("main.tex", "\\label{foo}\n\\ref{foo}\\label{bar}")])
            .main("main.tex")
            .line(0)
            .character(7)
            .build();
        let request = tester.highlight();
        let context = CursorContext::new(request);

        let actual_highlights = find_label_highlights(&context).unwrap();

        let expected_highlights = vec![
            DocumentHighlight {
                range: Range::new_simple(0, 7, 0, 10),
                kind: Some(DocumentHighlightKind::WRITE),
            },
            DocumentHighlight {
                range: Range::new_simple(1, 5, 1, 8),
                kind: Some(DocumentHighlightKind::READ),
            },
        ];

        assert_eq!(actual_highlights, expected_highlights);
    }
}