1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
//! This module contains functions for editing syntax trees. As the trees are
//! immutable, all function here return a fresh copy of the tree, instead of
//! doing an in-place modification.
use std::{iter, ops::RangeInclusive};
use arrayvec::ArrayVec;
use crate::{
algo,
ast::{
self,
make::{self, tokens},
AstNode,
},
AstToken, InsertPosition, SmolStr, SyntaxElement,
SyntaxKind::{ATTR, COMMENT, WHITESPACE},
SyntaxNode, T,
};
impl ast::FnDef {
#[must_use]
pub fn with_body(&self, body: ast::Block) -> ast::FnDef {
let mut to_insert: ArrayVec<[SyntaxElement; 2]> = ArrayVec::new();
let old_body_or_semi: SyntaxElement = if let Some(old_body) = self.body() {
old_body.syntax().clone().into()
} else if let Some(semi) = self.semicolon_token() {
to_insert.push(make::tokens::single_space().into());
semi.into()
} else {
to_insert.push(make::tokens::single_space().into());
to_insert.push(body.syntax().clone().into());
return insert_children(self, InsertPosition::Last, to_insert.into_iter());
};
to_insert.push(body.syntax().clone().into());
let replace_range = RangeInclusive::new(old_body_or_semi.clone(), old_body_or_semi);
replace_children(self, replace_range, to_insert.into_iter())
}
}
impl ast::ItemList {
#[must_use]
pub fn append_items(&self, items: impl Iterator<Item = ast::ImplItem>) -> ast::ItemList {
let mut res = self.clone();
if !self.syntax().text().contains_char('\n') {
res = res.make_multiline();
}
items.for_each(|it| res = res.append_item(it));
res
}
#[must_use]
pub fn append_item(&self, item: ast::ImplItem) -> ast::ItemList {
let (indent, position) = match self.impl_items().last() {
Some(it) => (
leading_indent(it.syntax()).unwrap_or_default().to_string(),
InsertPosition::After(it.syntax().clone().into()),
),
None => match self.l_curly() {
Some(it) => (
" ".to_string() + &leading_indent(self.syntax()).unwrap_or_default(),
InsertPosition::After(it),
),
None => return self.clone(),
},
};
let ws = tokens::WsBuilder::new(&format!("\n{}", indent));
let to_insert: ArrayVec<[SyntaxElement; 2]> =
[ws.ws().into(), item.syntax().clone().into()].into();
insert_children(self, position, to_insert.into_iter())
}
fn l_curly(&self) -> Option<SyntaxElement> {
self.syntax().children_with_tokens().find(|it| it.kind() == T!['{'])
}
fn make_multiline(&self) -> ast::ItemList {
let l_curly = match self.syntax().children_with_tokens().find(|it| it.kind() == T!['{']) {
Some(it) => it,
None => return self.clone(),
};
let sibling = match l_curly.next_sibling_or_token() {
Some(it) => it,
None => return self.clone(),
};
let existing_ws = match sibling.as_token() {
None => None,
Some(tok) if tok.kind() != WHITESPACE => None,
Some(ws) => {
if ws.text().contains('\n') {
return self.clone();
}
Some(ws.clone())
}
};
let indent = leading_indent(self.syntax()).unwrap_or("".into());
let ws = tokens::WsBuilder::new(&format!("\n{}", indent));
let to_insert = iter::once(ws.ws().into());
match existing_ws {
None => insert_children(self, InsertPosition::After(l_curly), to_insert),
Some(ws) => {
replace_children(self, RangeInclusive::new(ws.clone().into(), ws.into()), to_insert)
}
}
}
}
pub fn strip_attrs_and_docs<N: ast::AttrsOwner>(node: N) -> N {
N::cast(strip_attrs_and_docs_inner(node.syntax().clone())).unwrap()
}
fn strip_attrs_and_docs_inner(mut node: SyntaxNode) -> SyntaxNode {
while let Some(start) =
node.children_with_tokens().find(|it| it.kind() == ATTR || it.kind() == COMMENT)
{
let end = match &start.next_sibling_or_token() {
Some(el) if el.kind() == WHITESPACE => el.clone(),
Some(_) | None => start.clone(),
};
node = algo::replace_children(&node, RangeInclusive::new(start, end), &mut iter::empty());
}
node
}
// Note this is copy-pasted from fmt. It seems like fmt should be a separate
// crate, but basic tree building should be this crate. However, tree building
// might want to call into fmt...
fn leading_indent(node: &SyntaxNode) -> Option<SmolStr> {
let prev_tokens = std::iter::successors(node.first_token(), |token| token.prev_token());
for token in prev_tokens {
if let Some(ws) = ast::Whitespace::cast(token.clone()) {
let ws_text = ws.text();
if let Some(pos) = ws_text.rfind('\n') {
return Some(ws_text[pos + 1..].into());
}
}
if token.text().contains('\n') {
break;
}
}
None
}
#[must_use]
fn insert_children<N: AstNode>(
parent: &N,
position: InsertPosition<SyntaxElement>,
mut to_insert: impl Iterator<Item = SyntaxElement>,
) -> N {
let new_syntax = algo::insert_children(parent.syntax(), position, &mut to_insert);
N::cast(new_syntax).unwrap()
}
#[must_use]
fn replace_children<N: AstNode>(
parent: &N,
to_replace: RangeInclusive<SyntaxElement>,
mut to_insert: impl Iterator<Item = SyntaxElement>,
) -> N {
let new_syntax = algo::replace_children(parent.syntax(), to_replace, &mut to_insert);
N::cast(new_syntax).unwrap()
}
|
