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//! FIXME: write short doc here
use std::fmt::{self, Display};
use hir::{Docs, Documentation, HasSource, HirDisplay};
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},
};
#[derive(Debug)]
pub enum CallableKind {
Function,
StructConstructor,
VariantConstructor,
Macro,
}
/// Contains information about a function signature
#[derive(Debug)]
pub struct FunctionSignature {
pub kind: CallableKind,
/// 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).value;
FunctionSignature::from(&ast_node).with_doc_opt(doc)
}
pub(crate) fn from_struct(db: &db::RootDatabase, st: hir::Struct) -> Option<Self> {
let node: ast::StructDef = st.source(db).value;
match node.kind() {
ast::StructKind::Named(_) => return None,
_ => (),
};
let params = st
.fields(db)
.into_iter()
.map(|field: hir::StructField| {
let ty = field.ty(db);
format!("{}", ty.display(db))
})
.collect();
Some(
FunctionSignature {
kind: CallableKind::StructConstructor,
visibility: node.visibility().map(|n| n.syntax().text().to_string()),
name: node.name().map(|n| n.text().to_string()),
ret_type: node.name().map(|n| n.text().to_string()),
parameters: params,
generic_parameters: generic_parameters(&node),
where_predicates: where_predicates(&node),
doc: None,
}
.with_doc_opt(st.docs(db)),
)
}
pub(crate) fn from_enum_variant(
db: &db::RootDatabase,
variant: hir::EnumVariant,
) -> Option<Self> {
let node: ast::EnumVariant = variant.source(db).value;
match node.kind() {
ast::StructKind::Named(_) | ast::StructKind::Unit => return None,
_ => (),
};
let parent_name = match variant.parent_enum(db).name(db) {
Some(name) => name.to_string(),
None => "missing".into(),
};
let name = format!("{}::{}", parent_name, variant.name(db).unwrap());
let params = variant
.fields(db)
.into_iter()
.map(|field: hir::StructField| {
let name = field.name(db);
let ty = field.ty(db);
format!("{}: {}", name, ty.display(db))
})
.collect();
Some(
FunctionSignature {
kind: CallableKind::VariantConstructor,
visibility: None,
name: Some(name),
ret_type: None,
parameters: params,
generic_parameters: vec![],
where_predicates: vec![],
doc: None,
}
.with_doc_opt(variant.docs(db)),
)
}
pub(crate) fn from_macro(db: &db::RootDatabase, macro_def: hir::MacroDef) -> Option<Self> {
let node: ast::MacroCall = macro_def.source(db).value;
let params = vec![];
Some(
FunctionSignature {
kind: CallableKind::Macro,
visibility: None,
name: node.name().map(|n| n.text().to_string()),
ret_type: None,
parameters: params,
generic_parameters: vec![],
where_predicates: vec![],
doc: None,
}
.with_doc_opt(macro_def.docs(db)),
)
}
}
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 {
kind: CallableKind::Function,
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 {
match self.kind {
CallableKind::Function => write!(f, "fn {}", name)?,
CallableKind::StructConstructor => write!(f, "struct {}", name)?,
CallableKind::VariantConstructor => write!(f, "{}", name)?,
CallableKind::Macro => write!(f, "{}!", 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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