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use std::fmt::{self, Display};
use hir::{Docs, Documentation, HasSource};
use join_to_string::join;
use ra_syntax::ast::{self, AstNode, NameOwner, VisibilityOwner};
use std::convert::From;
use crate::{
db,
display::{generic_parameters, where_predicates},
};
/// Contains information about a function signature
#[derive(Debug)]
pub struct FunctionSignature {
/// Optional visibility
pub visibility: Option<String>,
/// Name of the function
pub name: Option<String>,
/// Documentation for the function
pub doc: Option<Documentation>,
/// Generic parameters
pub generic_parameters: Vec<String>,
/// Parameters of the function
pub parameters: Vec<String>,
/// Optional return type
pub ret_type: Option<String>,
/// Where predicates
pub where_predicates: Vec<String>,
}
impl FunctionSignature {
pub(crate) fn with_doc_opt(mut self, doc: Option<Documentation>) -> Self {
self.doc = doc;
self
}
pub(crate) fn from_hir(db: &db::RootDatabase, function: hir::Function) -> Self {
let doc = function.docs(db);
let ast_node = function.source(db).ast;
FunctionSignature::from(&ast_node).with_doc_opt(doc)
}
}
impl From<&'_ ast::FnDef> for FunctionSignature {
fn from(node: &ast::FnDef) -> FunctionSignature {
fn param_list(node: &ast::FnDef) -> Vec<String> {
let mut res = vec![];
if let Some(param_list) = node.param_list() {
if let Some(self_param) = param_list.self_param() {
res.push(self_param.syntax().text().to_string())
}
res.extend(param_list.params().map(|param| param.syntax().text().to_string()));
}
res
}
FunctionSignature {
visibility: node.visibility().map(|n| n.syntax().text().to_string()),
name: node.name().map(|n| n.text().to_string()),
ret_type: node
.ret_type()
.and_then(|r| r.type_ref())
.map(|n| n.syntax().text().to_string()),
parameters: param_list(node),
generic_parameters: generic_parameters(node),
where_predicates: where_predicates(node),
// docs are processed separately
doc: None,
}
}
}
impl Display for FunctionSignature {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if let Some(t) = &self.visibility {
write!(f, "{} ", t)?;
}
if let Some(name) = &self.name {
write!(f, "fn {}", name)?;
}
if !self.generic_parameters.is_empty() {
join(self.generic_parameters.iter())
.separator(", ")
.surround_with("<", ">")
.to_fmt(f)?;
}
join(self.parameters.iter()).separator(", ").surround_with("(", ")").to_fmt(f)?;
if let Some(t) = &self.ret_type {
write!(f, " -> {}", t)?;
}
if !self.where_predicates.is_empty() {
write!(f, "\nwhere ")?;
join(self.where_predicates.iter()).separator(",\n ").to_fmt(f)?;
}
Ok(())
}
}
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