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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
use std::cmp::Ordering;
use syntax::ast::{self, Visibility, Attribute, MetaItem, MetaItemKind};
use syntax::codemap::{CodeMap, Span, BytePos};
use syntax::abi;
use Indent;
use comment::FindUncommented;
use rewrite::{Rewrite, RewriteContext};
use SKIP_ANNOTATION;
pub trait CodeMapSpanUtils {
fn span_after(&self, original: Span, needle: &str) -> BytePos;
fn span_after_last(&self, original: Span, needle: &str) -> BytePos;
fn span_before(&self, original: Span, needle: &str) -> BytePos;
}
impl CodeMapSpanUtils for CodeMap {
#[inline]
fn span_after(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).unwrap();
let offset = snippet.find_uncommented(needle).unwrap() + needle.len();
original.lo + BytePos(offset as u32)
}
#[inline]
fn span_after_last(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).unwrap();
let mut offset = 0;
while let Some(additional_offset) = snippet[offset..].find_uncommented(needle) {
offset += additional_offset + needle.len();
}
original.lo + BytePos(offset as u32)
}
#[inline]
fn span_before(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).unwrap();
let offset = snippet.find_uncommented(needle).unwrap();
original.lo + BytePos(offset as u32)
}
}
#[inline]
pub fn extra_offset(text: &str, offset: Indent) -> usize {
match text.rfind('\n') {
Some(idx) => text.len() - idx - 1 - offset.width(),
None => text.len(),
}
}
#[inline]
pub fn format_visibility(vis: Visibility) -> &'static str {
match vis {
Visibility::Public => "pub ",
Visibility::Inherited => "",
}
}
#[inline]
pub fn format_unsafety(unsafety: ast::Unsafety) -> &'static str {
match unsafety {
ast::Unsafety::Unsafe => "unsafe ",
ast::Unsafety::Normal => "",
}
}
#[inline]
pub fn format_mutability(mutability: ast::Mutability) -> &'static str {
match mutability {
ast::Mutability::Mutable => "mut ",
ast::Mutability::Immutable => "",
}
}
#[inline]
pub fn format_abi(abi: abi::Abi) -> String {
format!("extern {} ", abi)
}
#[inline]
pub fn first_line_width(s: &str) -> usize {
match s.find('\n') {
Some(n) => n,
None => s.len(),
}
}
#[inline]
pub fn last_line_width(s: &str) -> usize {
match s.rfind('\n') {
Some(n) => s.len() - n - 1,
None => s.len(),
}
}
#[inline]
pub fn trimmed_last_line_width(s: &str) -> usize {
match s.rfind('\n') {
Some(n) => s[(n + 1)..].trim().len(),
None => s.trim().len(),
}
}
#[inline]
fn is_skip(meta_item: &MetaItem) -> bool {
match meta_item.node {
MetaItemKind::Word(ref s) => *s == SKIP_ANNOTATION,
MetaItemKind::List(ref s, ref l) => *s == "cfg_attr" && l.len() == 2 && is_skip(&l[1]),
_ => false,
}
}
#[inline]
pub fn contains_skip(attrs: &[Attribute]) -> bool {
attrs.iter().any(|a| is_skip(&a.node.value))
}
#[inline]
pub fn end_typaram(typaram: &ast::TyParam) -> BytePos {
typaram.bounds
.last()
.map_or(typaram.span, |bound| {
match *bound {
ast::RegionTyParamBound(ref lt) => lt.span,
ast::TraitTyParamBound(ref prt, _) => prt.span,
}
})
.hi
}
#[inline]
pub fn semicolon_for_expr(expr: &ast::Expr) -> bool {
match expr.node {
ast::ExprKind::Ret(..) |
ast::ExprKind::Again(..) |
ast::ExprKind::Break(..) => true,
_ => false,
}
}
#[inline]
pub fn semicolon_for_stmt(stmt: &ast::Stmt) -> bool {
match stmt.node {
ast::StmtKind::Semi(ref expr, _) => {
match expr.node {
ast::ExprKind::While(..) |
ast::ExprKind::WhileLet(..) |
ast::ExprKind::Loop(..) |
ast::ExprKind::ForLoop(..) => false,
_ => true,
}
}
ast::StmtKind::Expr(..) => false,
_ => true,
}
}
#[inline]
pub fn trim_newlines(input: &str) -> &str {
match input.find(|c| c != '\n' && c != '\r') {
Some(start) => {
let end = input.rfind(|c| c != '\n' && c != '\r').unwrap_or(0) + 1;
&input[start..end]
}
None => "",
}
}
#[macro_export]
macro_rules! impl_enum_decodable {
( $e:ident, $( $x:ident ),* ) => {
impl ::rustc_serialize::Decodable for $e {
fn decode<D: ::rustc_serialize::Decoder>(d: &mut D) -> Result<Self, D::Error> {
use std::ascii::AsciiExt;
let s = try!(d.read_str());
$(
if stringify!($x).eq_ignore_ascii_case(&s) {
return Ok($e::$x);
}
)*
Err(d.error("Bad variant"))
}
}
impl ::std::str::FromStr for $e {
type Err = &'static str;
fn from_str(s: &str) -> Result<Self, Self::Err> {
use std::ascii::AsciiExt;
$(
if stringify!($x).eq_ignore_ascii_case(s) {
return Ok($e::$x);
}
)*
Err("Bad variant")
}
}
impl ::config::ConfigType for $e {
fn get_variant_names() -> String {
let mut variants = Vec::new();
$(
variants.push(stringify!($x));
)*
format!("[{}]", variants.join("|"))
}
}
};
}
#[macro_export]
macro_rules! try_opt {
($expr:expr) => (match $expr {
Some(val) => val,
None => { return None; }
})
}
macro_rules! msg {
($($arg:tt)*) => (
match writeln!(&mut ::std::io::stderr(), $($arg)* ) {
Ok(_) => {},
Err(x) => panic!("Unable to write to stderr: {}", x),
}
)
}
pub fn wrap_str<S: AsRef<str>>(s: S, max_width: usize, width: usize, offset: Indent) -> Option<S> {
{
let snippet = s.as_ref();
if !snippet.contains('\n') && snippet.len() > width {
return None;
} else {
let mut lines = snippet.lines();
let first_line_max_len = try_opt!(max_width.checked_sub(offset.width()));
if lines.next().unwrap().len() > first_line_max_len {
return None;
}
if lines.find(|line| line.len() > max_width).is_some() {
return None;
}
if snippet.lines().rev().next().unwrap().len() > offset.width() + width {
return None;
}
}
}
Some(s)
}
impl Rewrite for String {
fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
wrap_str(self, context.config.max_width, width, offset).map(ToOwned::to_owned)
}
}
pub fn binary_search<C, T>(mut lo: usize, mut hi: usize, callback: C) -> Option<T>
where C: Fn(usize) -> Result<T, Ordering>
{
let mut middle = hi;
while lo <= hi {
match callback(middle) {
Ok(val) => return Some(val),
Err(Ordering::Less) => {
hi = middle - 1;
}
Err(..) => {
lo = middle + 1;
}
}
middle = (hi + lo) / 2;
}
None
}
#[test]
fn bin_search_test() {
let closure = |i| {
match i {
4 => Ok(()),
j if j > 4 => Err(Ordering::Less),
j if j < 4 => Err(Ordering::Greater),
_ => unreachable!(),
}
};
assert_eq!(Some(()), binary_search(1, 10, &closure));
assert_eq!(None, binary_search(1, 3, &closure));
assert_eq!(Some(()), binary_search(0, 44, &closure));
assert_eq!(Some(()), binary_search(4, 125, &closure));
assert_eq!(None, binary_search(6, 100, &closure));
}
pub fn left_most_sub_expr(e: &ast::Expr) -> &ast::Expr {
match e.node {
ast::ExprKind::InPlace(ref e, _) |
ast::ExprKind::Call(ref e, _) |
ast::ExprKind::Binary(_, ref e, _) |
ast::ExprKind::Cast(ref e, _) |
ast::ExprKind::Type(ref e, _) |
ast::ExprKind::Assign(ref e, _) |
ast::ExprKind::AssignOp(_, ref e, _) |
ast::ExprKind::Field(ref e, _) |
ast::ExprKind::TupField(ref e, _) |
ast::ExprKind::Index(ref e, _) |
ast::ExprKind::Range(Some(ref e), _, _) => left_most_sub_expr(e),
_ => e,
}
}