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//! Structural editing for ast.
use std::iter::empty;
use parser::T;
use crate::{
algo::neighbor,
ast::{self, edit::AstNodeEdit, make, GenericParamsOwner, WhereClause},
ted::{self, Position},
AstNode, AstToken, Direction,
};
use super::NameOwner;
pub trait GenericParamsOwnerEdit: ast::GenericParamsOwner + AstNodeEdit {
fn get_or_create_where_clause(&self) -> ast::WhereClause;
}
impl GenericParamsOwnerEdit for ast::Fn {
fn get_or_create_where_clause(&self) -> WhereClause {
if self.where_clause().is_none() {
let position = if let Some(ty) = self.ret_type() {
Position::after(ty.syntax())
} else if let Some(param_list) = self.param_list() {
Position::after(param_list.syntax())
} else {
Position::last_child_of(self.syntax())
};
create_where_clause(position)
}
self.where_clause().unwrap()
}
}
impl GenericParamsOwnerEdit for ast::Impl {
fn get_or_create_where_clause(&self) -> WhereClause {
if self.where_clause().is_none() {
let position = if let Some(items) = self.assoc_item_list() {
Position::before(items.syntax())
} else {
Position::last_child_of(self.syntax())
};
create_where_clause(position)
}
self.where_clause().unwrap()
}
}
impl GenericParamsOwnerEdit for ast::Trait {
fn get_or_create_where_clause(&self) -> WhereClause {
if self.where_clause().is_none() {
let position = if let Some(items) = self.assoc_item_list() {
Position::before(items.syntax())
} else {
Position::last_child_of(self.syntax())
};
create_where_clause(position)
}
self.where_clause().unwrap()
}
}
impl GenericParamsOwnerEdit for ast::Struct {
fn get_or_create_where_clause(&self) -> WhereClause {
if self.where_clause().is_none() {
let tfl = self.field_list().and_then(|fl| match fl {
ast::FieldList::RecordFieldList(_) => None,
ast::FieldList::TupleFieldList(it) => Some(it),
});
let position = if let Some(tfl) = tfl {
Position::after(tfl.syntax())
} else if let Some(gpl) = self.generic_param_list() {
Position::after(gpl.syntax())
} else if let Some(name) = self.name() {
Position::after(name.syntax())
} else {
Position::last_child_of(self.syntax())
};
create_where_clause(position)
}
self.where_clause().unwrap()
}
}
impl GenericParamsOwnerEdit for ast::Enum {
fn get_or_create_where_clause(&self) -> WhereClause {
if self.where_clause().is_none() {
let position = if let Some(gpl) = self.generic_param_list() {
Position::after(gpl.syntax())
} else if let Some(name) = self.name() {
Position::after(name.syntax())
} else {
Position::last_child_of(self.syntax())
};
create_where_clause(position)
}
self.where_clause().unwrap()
}
}
fn create_where_clause(position: Position) {
let where_clause = make::where_clause(empty()).clone_for_update();
ted::insert(position, where_clause.syntax());
}
impl ast::WhereClause {
pub fn add_predicate(&self, predicate: ast::WherePred) {
if let Some(pred) = self.predicates().last() {
if !pred.syntax().siblings_with_tokens(Direction::Next).any(|it| it.kind() == T![,]) {
ted::append_child_raw(self.syntax(), make::token(T![,]));
}
}
ted::append_child(self.syntax(), predicate.syntax())
}
}
impl ast::TypeBoundList {
pub fn remove(&self) {
if let Some(colon) =
self.syntax().siblings_with_tokens(Direction::Prev).find(|it| it.kind() == T![:])
{
ted::remove_all(colon..=self.syntax().clone().into())
} else {
ted::remove(self.syntax())
}
}
}
impl ast::UseTree {
pub fn remove(&self) {
for &dir in [Direction::Next, Direction::Prev].iter() {
if let Some(next_use_tree) = neighbor(self, dir) {
let separators = self
.syntax()
.siblings_with_tokens(dir)
.skip(1)
.take_while(|it| it.as_node() != Some(next_use_tree.syntax()));
ted::remove_all_iter(separators);
break;
}
}
ted::remove(self.syntax())
}
}
impl ast::Use {
pub fn remove(&self) {
let next_ws = self
.syntax()
.next_sibling_or_token()
.and_then(|it| it.into_token())
.and_then(ast::Whitespace::cast);
if let Some(next_ws) = next_ws {
let ws_text = next_ws.syntax().text();
if let Some(rest) = ws_text.strip_prefix('\n') {
if rest.is_empty() {
ted::remove(next_ws.syntax())
} else {
ted::replace(next_ws.syntax(), make::tokens::whitespace(rest))
}
}
}
ted::remove(self.syntax())
}
}
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