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-rw-r--r--support/texlab/src/hover/bibtex_string_reference.rs106
1 files changed, 106 insertions, 0 deletions
diff --git a/support/texlab/src/hover/bibtex_string_reference.rs b/support/texlab/src/hover/bibtex_string_reference.rs
new file mode 100644
index 0000000000..28df138291
--- /dev/null
+++ b/support/texlab/src/hover/bibtex_string_reference.rs
@@ -0,0 +1,106 @@
+use crate::formatting::bibtex::{self, BibtexFormattingParams};
+use crate::syntax::*;
+use crate::workspace::*;
+use futures_boxed::boxed;
+use lsp_types::*;
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct BibtexStringReferenceHoverProvider;
+
+impl FeatureProvider for BibtexStringReferenceHoverProvider {
+ type Params = TextDocumentPositionParams;
+ type Output = Option<Hover>;
+
+ #[boxed]
+ async fn execute<'a>(&'a self, request: &'a FeatureRequest<Self::Params>) -> Self::Output {
+ if let SyntaxTree::Bibtex(tree) = &request.document().tree {
+ let reference = Self::find_reference(tree, request.params.position)?;
+ for declaration in &tree.root.children {
+ if let BibtexDeclaration::String(string) = &declaration {
+ let definition = Self::find_definition(string, reference);
+ if definition.is_some() {
+ return definition;
+ }
+ }
+ }
+ }
+ None
+ }
+}
+
+impl BibtexStringReferenceHoverProvider {
+ fn find_reference(tree: &BibtexSyntaxTree, position: Position) -> Option<&BibtexToken> {
+ let mut results = tree.find(position);
+ results.reverse();
+ match (&results[0], results.get(1)) {
+ (BibtexNode::Word(reference), Some(BibtexNode::Concat(_))) => Some(&reference.token),
+ (BibtexNode::Word(reference), Some(BibtexNode::Field(_))) => Some(&reference.token),
+ _ => None,
+ }
+ }
+
+ fn find_definition(string: &BibtexString, reference: &BibtexToken) -> Option<Hover> {
+ if string.name.as_ref()?.text() != reference.text() {
+ return None;
+ }
+
+ let text =
+ bibtex::format_content(string.value.as_ref()?, &BibtexFormattingParams::default());
+ Some(Hover {
+ contents: HoverContents::Markup(MarkupContent {
+ kind: MarkupKind::PlainText,
+ value: text,
+ }),
+ range: Some(reference.range()),
+ })
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::range::RangeExt;
+
+ #[test]
+ fn test_inside_reference() {
+ let hover = test_feature(
+ BibtexStringReferenceHoverProvider,
+ FeatureSpec {
+ files: vec![FeatureSpec::file(
+ "foo.bib",
+ "@string{foo = \"Foo\"}\n@string{bar = \"Bar\"}\n@article{baz, author = bar}",
+ )],
+ main_file: "foo.bib",
+ position: Position::new(2, 24),
+ ..FeatureSpec::default()
+ },
+ );
+ assert_eq!(
+ hover,
+ Some(Hover {
+ contents: HoverContents::Markup(MarkupContent {
+ kind: MarkupKind::PlainText,
+ value: "\"Bar\"".into(),
+ }),
+ range: Some(Range::new_simple(2, 23, 2, 26)),
+ })
+ );
+ }
+
+ #[test]
+ fn test_outside_reference() {
+ let hover = test_feature(
+ BibtexStringReferenceHoverProvider,
+ FeatureSpec {
+ files: vec![FeatureSpec::file(
+ "foo.bib",
+ "@string{foo = \"Foo\"}\n@string{bar = \"Bar\"}\n@article{baz, author = bar}",
+ )],
+ main_file: "foo.bib",
+ position: Position::new(2, 20),
+ ..FeatureSpec::default()
+ },
+ );
+ assert_eq!(hover, None);
+ }
+}