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path: root/support/texlab/crates/texlab/src/features/hover.rs
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use base_db::{FeatureParams, Workspace};
use hover::{HoverData, HoverParams};

use crate::util::line_index_ext::LineIndexExt;

pub fn find(workspace: &Workspace, params: lsp_types::HoverParams) -> Option<lsp_types::Hover> {
    let uri_and_pos = &params.text_document_position_params;
    let document = workspace.lookup(&uri_and_pos.text_document.uri)?;
    let feature = FeatureParams::new(workspace, document);
    let offset = document.line_index.offset_lsp(uri_and_pos.position)?;
    let hover = ::hover::find(HoverParams { feature, offset })?;

    let contents = match hover.data {
        HoverData::Citation(text) => lsp_types::MarkupContent {
            kind: lsp_types::MarkupKind::Markdown,
            value: text,
        },
        HoverData::Package(description) => lsp_types::MarkupContent {
            kind: lsp_types::MarkupKind::PlainText,
            value: description.into(),
        },
        HoverData::EntryType(type_) => lsp_types::MarkupContent {
            kind: lsp_types::MarkupKind::Markdown,
            value: type_.documentation?.into(),
        },
        HoverData::FieldType(type_) => lsp_types::MarkupContent {
            kind: lsp_types::MarkupKind::Markdown,
            value: type_.documentation.into(),
        },
        HoverData::Label(label) => lsp_types::MarkupContent {
            kind: lsp_types::MarkupKind::PlainText,
            value: label.reference(),
        },
        HoverData::StringRef(text) => lsp_types::MarkupContent {
            kind: lsp_types::MarkupKind::PlainText,
            value: text,
        },
    };

    Some(lsp_types::Hover {
        contents: lsp_types::HoverContents::Markup(contents),
        range: document.line_index.line_col_lsp_range(hover.range),
    })
}