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//! This module contains utilities for turning SyntaxNodes and HIR types
//! into types that may be used to render in a UI.
use crate::{
ast::{self, AstNode, AttrsOwner, GenericParamsOwner, NameOwner},
SyntaxKind::{ATTR, COMMENT},
};
use ast::VisibilityOwner;
use stdx::format_to;
pub fn function_declaration(node: &ast::Fn) -> String {
let mut buf = String::new();
if let Some(vis) = node.visibility() {
format_to!(buf, "{} ", vis);
}
if node.async_token().is_some() {
format_to!(buf, "async ");
}
if node.const_token().is_some() {
format_to!(buf, "const ");
}
if node.unsafe_token().is_some() {
format_to!(buf, "unsafe ");
}
if let Some(abi) = node.abi() {
// Keyword `extern` is included in the string.
format_to!(buf, "{} ", abi);
}
if let Some(name) = node.name() {
format_to!(buf, "fn {}", name)
}
if let Some(type_params) = node.generic_param_list() {
format_to!(buf, "{}", type_params);
}
if let Some(param_list) = node.param_list() {
let params: Vec<String> = param_list
.self_param()
.into_iter()
.map(|self_param| self_param.to_string())
.chain(param_list.params().map(|param| param.to_string()))
.collect();
// Useful to inline parameters
format_to!(buf, "({})", params.join(", "));
}
if let Some(ret_type) = node.ret_type() {
if ret_type.ty().is_some() {
format_to!(buf, " {}", ret_type);
}
}
if let Some(where_clause) = node.where_clause() {
format_to!(buf, "\n{}", where_clause);
}
buf
}
pub fn const_label(node: &ast::Const) -> 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 fn type_label(node: &ast::TypeAlias) -> 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 fn macro_label(node: &ast::Macro) -> String {
let name = node.name().map(|name| name.syntax().text().to_string()).unwrap_or_default();
match node {
ast::Macro::MacroRules(node) => {
let vis = if node.has_atom_attr("macro_export") { "#[macro_export]\n" } else { "" };
format!("{}macro_rules! {}", vis, name)
}
ast::Macro::MacroDef(node) => {
let mut s = String::new();
if let Some(vis) = node.visibility() {
format_to!(s, "{} ", vis);
}
format_to!(s, "macro {}", name);
s
}
}
}
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