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
use crate::predoc::{Doc, DocE, Pretty, TextAnn, newline, text_width, unexpand_spacing_prime};
use crate::types::{Expression, StringPart};
use super::absorb::is_absorbable_term;
use super::term::push_parenthesized_inner;
use super::util::{is_simple_expression, is_spaces};
impl Pretty for StringPart {
fn pretty(&self, doc: &mut Doc) {
match self {
Self::TextPart(s) => {
doc.text(&**s);
}
Self::Interpolation(whole) => {
let trailing_empty = whole.trailing_trivia.is_empty();
let value = &whole.value;
if trailing_empty
&& let Expression::Term(term) = value
&& is_absorbable_term(term)
{
doc.group(|g| {
g.text("${");
term.pretty(g);
g.text("}");
});
return;
}
// Simple interpolations (mostly identifiers/selections): force
// single line regardless of width.
if trailing_empty && is_simple_expression(value) {
doc.text("${");
let mut rendered = Doc::new();
value.pretty(&mut rendered);
match unexpand_spacing_prime(None, &rendered) {
Some(compact) => doc.extend(compact),
None => doc.extend(rendered),
}
doc.text("}");
return;
}
// General case: render the body and, if it fits compactly in
// ≤30 columns, force it onto this line even past the width limit.
let mut rendered = Doc::new();
whole.pretty(&mut rendered);
doc.group(|g| {
g.text("${");
match unexpand_spacing_prime(Some(30), &rendered) {
Some(compact) => g.extend(compact),
None => {
g.nested(|n| {
n.line_prime();
n.extend(rendered);
n.line_prime();
});
}
}
g.text("}");
});
}
}
}
}
impl Pretty for Vec<StringPart> {
fn pretty(&self, doc: &mut Doc) {
// When the interpolation is the only thing on the string line (modulo
// leading whitespace) and carries no trailing trivia, absorb its body
// instead of surrounding it with `line'`.
let lone = match self.as_slice() {
[StringPart::Interpolation(whole)] if whole.trailing_trivia.is_empty() => {
Some(("", &whole.value))
}
[StringPart::TextPart(pre), StringPart::Interpolation(whole)]
if is_spaces(pre) && whole.trailing_trivia.is_empty() =>
{
Some((&**pre, &whole.value))
}
_ => None,
};
if let Some((pre, expr)) = lone {
doc.text(pre);
doc.offset(text_width(pre), |d| {
d.group(|g| {
g.text("${");
// Upstream keeps this case split identical to `prettyTerm (Parenthesized …)`.
g.nested(|n| push_parenthesized_inner(n, expr));
g.text("}");
});
});
return;
}
match self.as_slice() {
// Lone interpolation with trailing trivia: always surround with `line'`.
[StringPart::Interpolation(whole)] => {
doc.group(|g| {
g.text("${");
g.nested(|n| {
n.line_prime();
whole.pretty(n);
n.line_prime();
});
g.text("}");
});
}
// If a line is split across multiple code lines due to large
// interpolations, indent the continuation by the line's leading
// whitespace so it lines up under the string content.
[StringPart::TextPart(t), rest @ ..] => {
let indentation = text_width(
&t.chars()
.take_while(|c| c.is_whitespace())
.collect::<String>(),
);
doc.text(&**t);
doc.offset(indentation, |d| {
for part in rest {
part.pretty(d);
}
});
}
_ => {
for part in self {
part.pretty(doc);
}
}
}
}
}
/// Format a simple string (with double quotes)
pub(super) fn push_pretty_simple_string(doc: &mut Doc, parts: &[Vec<StringPart>]) {
doc.group(|d| {
d.text("\"");
// Use literal \n instead of newline() to avoid indentation
let newline_doc = [DocE::Text(0, 0, TextAnn::RegularT, "\n".to_string())];
d.sep_by(&newline_doc, parts.iter().cloned());
d.text("\"");
});
}
/// Format an indented string (with '')
pub(super) fn push_pretty_indented_string(doc: &mut Doc, parts: &[Vec<StringPart>]) {
doc.group(|d| {
d.text("''");
// For multi-line strings, add a potential line break after opening ''
if parts.len() > 1 {
d.line_prime();
}
d.nested(|inner| {
inner.sep_by(&[newline()], parts.iter().cloned());
});
d.text("''");
});
}