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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
use algo;
use grammar;
use lexer::{tokenize, Token};
use text_unit::{TextRange, TextUnit};
use yellow::{self, SyntaxNodeRef, GreenNode, SyntaxError};
use parser_impl;
use parser_api::Parser;
use {
SyntaxKind::*,
};
use text_utils::replace_range;
#[derive(Debug, Clone)]
pub struct AtomEdit {
pub delete: TextRange,
pub insert: String,
}
impl AtomEdit {
pub fn replace(range: TextRange, replace_with: String) -> AtomEdit {
AtomEdit { delete: range, insert: replace_with }
}
pub fn delete(range: TextRange) -> AtomEdit {
AtomEdit::replace(range, String::new())
}
pub fn insert(offset: TextUnit, text: String) -> AtomEdit {
AtomEdit::replace(TextRange::offset_len(offset, 0.into()), text)
}
}
pub(crate) fn incremental_reparse(
node: SyntaxNodeRef,
edit: &AtomEdit,
errors: Vec<SyntaxError>,
) -> Option<(GreenNode, Vec<SyntaxError>)> {
let (node, green, new_errors) =
reparse_leaf(node, &edit).or_else(|| reparse_block(node, &edit))?;
let green_root = node.replace_with(green);
let errors = merge_errors(errors, new_errors, node, edit);
Some((green_root, errors))
}
fn reparse_leaf<'node>(
node: SyntaxNodeRef<'node>,
edit: &AtomEdit,
) -> Option<(SyntaxNodeRef<'node>, GreenNode, Vec<SyntaxError>)> {
let node = algo::find_covering_node(node, edit.delete);
match node.kind() {
| WHITESPACE
| COMMENT
| DOC_COMMENT
| IDENT
| STRING
| RAW_STRING => {
let text = get_text_after_edit(node, &edit);
let tokens = tokenize(&text);
let token = match tokens[..] {
[token] if token.kind == node.kind() => token,
_ => return None,
};
if token.kind == IDENT && is_contextual_kw(&text) {
return None;
}
let green = GreenNode::new_leaf(node.kind(), &text);
let new_errors = vec![];
Some((node, green, new_errors))
}
_ => None,
}
}
fn reparse_block<'node>(
node: SyntaxNodeRef<'node>,
edit: &AtomEdit,
) -> Option<(SyntaxNodeRef<'node>, GreenNode, Vec<SyntaxError>)> {
let (node, reparser) = find_reparsable_node(node, edit.delete)?;
let text = get_text_after_edit(node, &edit);
let tokens = tokenize(&text);
if !is_balanced(&tokens) {
return None;
}
let (green, new_errors) =
parser_impl::parse_with::<yellow::GreenBuilder>(
&text, &tokens, reparser,
);
Some((node, green, new_errors))
}
fn get_text_after_edit(node: SyntaxNodeRef, edit: &AtomEdit) -> String {
replace_range(
node.text().to_string(),
edit.delete - node.range().start(),
&edit.insert,
)
}
fn is_contextual_kw(text: &str) -> bool {
match text {
| "auto"
| "default"
| "union" => true,
_ => false,
}
}
fn find_reparsable_node<'node>(
node: SyntaxNodeRef<'node>,
range: TextRange,
) -> Option<(SyntaxNodeRef<'node>, fn(&mut Parser))> {
let node = algo::find_covering_node(node, range);
return algo::ancestors(node)
.filter_map(|node| reparser(node).map(|r| (node, r)))
.next();
fn reparser(node: SyntaxNodeRef) -> Option<fn(&mut Parser)> {
let res = match node.kind() {
BLOCK => grammar::block,
NAMED_FIELD_DEF_LIST => grammar::named_field_def_list,
NAMED_FIELD_LIST => grammar::named_field_list,
ENUM_VARIANT_LIST => grammar::enum_variant_list,
MATCH_ARM_LIST => grammar::match_arm_list,
USE_TREE_LIST => grammar::use_tree_list,
EXTERN_ITEM_LIST => grammar::extern_item_list,
TOKEN_TREE if node.first_child().unwrap().kind() == L_CURLY => grammar::token_tree,
ITEM_LIST => {
let parent = node.parent().unwrap();
match parent.kind() {
IMPL_ITEM => grammar::impl_item_list,
TRAIT_DEF => grammar::trait_item_list,
MODULE => grammar::mod_item_list,
_ => return None,
}
}
_ => return None,
};
Some(res)
}
}
fn is_balanced(tokens: &[Token]) -> bool {
if tokens.len() == 0
|| tokens.first().unwrap().kind != L_CURLY
|| tokens.last().unwrap().kind != R_CURLY {
return false;
}
let mut balance = 0usize;
for t in tokens.iter() {
match t.kind {
L_CURLY => balance += 1,
R_CURLY => balance = match balance.checked_sub(1) {
Some(b) => b,
None => return false,
},
_ => (),
}
}
balance == 0
}
fn merge_errors(
old_errors: Vec<SyntaxError>,
new_errors: Vec<SyntaxError>,
old_node: SyntaxNodeRef,
edit: &AtomEdit,
) -> Vec<SyntaxError> {
let mut res = Vec::new();
for e in old_errors {
if e.offset <= old_node.range().start() {
res.push(e)
} else if e.offset >= old_node.range().end() {
res.push(SyntaxError {
msg: e.msg,
offset: e.offset + TextUnit::of_str(&edit.insert) - edit.delete.len(),
})
}
}
for e in new_errors {
res.push(SyntaxError {
msg: e.msg,
offset: e.offset + old_node.range().start(),
})
}
res
}
|
