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
|
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use Indent;
use rewrite::{Rewrite, RewriteContext};
use utils::{CodeMapSpanUtils, wrap_str, format_mutability};
use lists::{format_item_list, itemize_list};
use expr::{rewrite_unary_prefix, rewrite_pair, rewrite_tuple};
use types::rewrite_path;
use syntax::ast::{BindingMode, Pat, PatKind, FieldPat};
impl Rewrite for Pat {
fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
match self.node {
PatKind::Box(ref pat) => rewrite_unary_prefix(context, "box ", &**pat, width, offset),
PatKind::Ident(binding_mode, ident, ref sub_pat) => {
let (prefix, mutability) = match binding_mode {
BindingMode::ByRef(mutability) => ("ref ", mutability),
BindingMode::ByValue(mutability) => ("", mutability),
};
let mut_infix = format_mutability(mutability);
let id_str = ident.node.to_string();
let sub_pat = match *sub_pat {
Some(ref p) => {
// 3 - ` @ `.
let width = try_opt!(width.checked_sub(prefix.len() + mut_infix.len() +
id_str.len() +
3));
format!(" @ {}", try_opt!(p.rewrite(context, width, offset)))
}
None => "".to_owned(),
};
let result = format!("{}{}{}{}", prefix, mut_infix, id_str, sub_pat);
wrap_str(result, context.config.max_width, width, offset)
}
PatKind::Wild => {
if 1 <= width {
Some("_".to_owned())
} else {
None
}
}
PatKind::QPath(ref q_self, ref path) => {
rewrite_path(context, true, Some(q_self), path, width, offset)
}
PatKind::Range(ref lhs, ref rhs) => {
rewrite_pair(&**lhs, &**rhs, "", "...", "", context, width, offset)
}
PatKind::Ref(ref pat, mutability) => {
let prefix = format!("&{}", format_mutability(mutability));
rewrite_unary_prefix(context, &prefix, &**pat, width, offset)
}
PatKind::Tup(ref items) => {
rewrite_tuple(context,
items.iter().map(|x| &**x),
self.span,
width,
offset)
}
PatKind::Path(ref path) => rewrite_path(context, true, None, path, width, offset),
PatKind::TupleStruct(ref path, ref pat_vec) => {
let path_str = try_opt!(rewrite_path(context, true, None, path, width, offset));
match *pat_vec {
Some(ref pat_vec) => {
if pat_vec.is_empty() {
Some(path_str)
} else {
// 1 = (
let width = try_opt!(width.checked_sub(path_str.len() + 1));
let offset = offset + path_str.len() + 1;
let items = itemize_list(context.codemap,
pat_vec.iter(),
")",
|item| item.span.lo,
|item| item.span.hi,
|item| item.rewrite(context, width, offset),
context.codemap.span_after(self.span, "("),
self.span.hi);
Some(format!("{}({})",
path_str,
try_opt!(format_item_list(items,
width,
offset,
context.config))))
}
}
None => Some(format!("{}(..)", path_str)),
}
}
PatKind::Lit(ref expr) => expr.rewrite(context, width, offset),
PatKind::Vec(ref prefix, ref slice_pat, ref suffix) => {
// Rewrite all the sub-patterns.
let prefix = prefix.iter().map(|p| p.rewrite(context, width, offset));
let slice_pat = slice_pat.as_ref().map(|p| {
Some(format!("{}..", try_opt!(p.rewrite(context, width, offset))))
});
let suffix = suffix.iter().map(|p| p.rewrite(context, width, offset));
// Munge them together.
let pats: Option<Vec<String>> = prefix.chain(slice_pat.into_iter())
.chain(suffix)
.collect();
// Check that all the rewrites succeeded, and if not return None.
let pats = try_opt!(pats);
// Unwrap all the sub-strings and join them with commas.
let result = format!("[{}]", pats.join(", "));
wrap_str(result, context.config.max_width, width, offset)
}
PatKind::Struct(ref path, ref fields, elipses) => {
let path = try_opt!(rewrite_path(context, true, None, path, width, offset));
let (elipses_str, terminator) = if elipses {
(", ..", "..")
} else {
("", "}")
};
// 5 = `{` plus space before and after plus `}` plus space before.
let budget = try_opt!(width.checked_sub(path.len() + 5 + elipses_str.len()));
// FIXME Using visual indenting, should use block or visual to match
// struct lit preference (however, in practice I think it is rare
// for struct patterns to be multi-line).
// 3 = `{` plus space before and after.
let offset = offset + path.len() + 3;
let items = itemize_list(context.codemap,
fields.iter(),
terminator,
|f| f.span.lo,
|f| f.span.hi,
|f| f.node.rewrite(context, budget, offset),
context.codemap.span_after(self.span, "{"),
self.span.hi);
let mut field_string = try_opt!(format_item_list(items,
budget,
offset,
context.config));
if elipses {
if field_string.contains('\n') {
field_string.push_str(",\n");
field_string.push_str(&offset.to_string(context.config));
field_string.push_str("..");
} else {
if field_string.len() > 0 {
field_string.push_str(", ");
}
field_string.push_str("..");
}
}
if field_string.is_empty() {
Some(format!("{} {{}}", path))
} else {
Some(format!("{} {{ {} }}", path, field_string))
}
}
// FIXME(#819) format pattern macros.
PatKind::Mac(..) => {
wrap_str(context.snippet(self.span),
context.config.max_width,
width,
offset)
}
}
}
}
impl Rewrite for FieldPat {
fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
let pat = self.pat.rewrite(context, width, offset);
if self.is_shorthand {
pat
} else {
wrap_str(format!("{}: {}", self.ident.to_string(), try_opt!(pat)),
context.config.max_width,
width,
offset)
}
}
}
|
