1 files changed, 84 insertions, 0 deletions

diff --git a/crates/ra_ide/src/display.rs b/crates/ra_ide/src/display.rs
new file mode 100644
index 000000000..30617412a
--- /dev/null
+++ b/crates/ra_ide/src/display.rs
@@ -0,0 +1,84 @@
+//! This module contains utilities for turning SyntaxNodes and HIR types
+//! into types that may be used to render in a UI.
+
+mod function_signature;
+mod navigation_target;
+mod structure;
+mod short_label;
+
+use ra_syntax::{
+    ast::{self, AstNode, AttrsOwner, NameOwner, TypeParamsOwner},
+    SyntaxKind::{ATTR, COMMENT},
+};
+
+pub use function_signature::FunctionSignature;
+pub use navigation_target::NavigationTarget;
+pub use structure::{file_structure, StructureNode};
+
+pub(crate) use navigation_target::{description_from_symbol, docs_from_symbol, ToNav};
+pub(crate) use short_label::ShortLabel;
+
+pub(crate) fn function_label(node: &ast::FnDef) -> String {
+    FunctionSignature::from(node).to_string()
+}
+
+pub(crate) fn const_label(node: &ast::ConstDef) -> String {
+    let label: String = node
+        .syntax()
+        .children_with_tokens()
+        .filter(|child| !(child.kind() == COMMENT || child.kind() == ATTR))
+        .map(|node| node.to_string())
+        .collect();
+
+    label.trim().to_owned()
+}
+
+pub(crate) fn type_label(node: &ast::TypeAliasDef) -> String {
+    let label: String = node
+        .syntax()
+        .children_with_tokens()
+        .filter(|child| !(child.kind() == COMMENT || child.kind() == ATTR))
+        .map(|node| node.to_string())
+        .collect();
+
+    label.trim().to_owned()
+}
+
+pub(crate) fn generic_parameters<N: TypeParamsOwner>(node: &N) -> Vec<String> {
+    let mut res = vec![];
+    if let Some(type_params) = node.type_param_list() {
+        res.extend(type_params.lifetime_params().map(|p| p.syntax().text().to_string()));
+        res.extend(type_params.type_params().map(|p| p.syntax().text().to_string()));
+    }
+    res
+}
+
+pub(crate) fn where_predicates<N: TypeParamsOwner>(node: &N) -> Vec<String> {
+    let mut res = vec![];
+    if let Some(clause) = node.where_clause() {
+        res.extend(clause.predicates().map(|p| p.syntax().text().to_string()));
+    }
+    res
+}
+
+pub(crate) fn macro_label(node: &ast::MacroCall) -> String {
+    let name = node.name().map(|name| name.syntax().text().to_string()).unwrap_or_default();
+    let vis = if node.has_atom_attr("macro_export") { "#[macro_export]\n" } else { "" };
+    format!("{}macro_rules! {}", vis, name)
+}
+
+pub(crate) fn rust_code_markup<CODE: AsRef<str>>(val: CODE) -> String {
+    rust_code_markup_with_doc::<_, &str>(val, None)
+}
+
+pub(crate) fn rust_code_markup_with_doc<CODE, DOC>(val: CODE, doc: Option<DOC>) -> String
+where
+    CODE: AsRef<str>,
+    DOC: AsRef<str>,
+{
+    if let Some(doc) = doc {
+        format!("```rust\n{}\n```\n\n{}", val.as_ref(), doc.as_ref())
+    } else {
+        format!("```rust\n{}\n```", val.as_ref())
+    }
+}