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
|
use super::parser::Parser;
use super::CharComponent;
pub fn parse_char_literal(src: &str) -> CharComponentIterator {
CharComponentIterator {
parser: Parser::new(src),
has_closing_quote: false,
}
}
pub struct CharComponentIterator<'a> {
parser: Parser<'a>,
pub has_closing_quote: bool,
}
impl<'a> Iterator for CharComponentIterator<'a> {
type Item = CharComponent;
fn next(&mut self) -> Option<CharComponent> {
if self.parser.pos == 0 {
assert!(
self.parser.advance() == '\'',
"char literal should start with a quote"
);
}
if let Some(component) = self.parser.parse_char_component() {
return Some(component);
}
// We get here when there are no char components left to parse
if self.parser.peek() == Some('\'') {
self.parser.advance();
self.has_closing_quote = true;
}
assert!(
self.parser.peek() == None,
"char literal should leave no unparsed input: src = {}, pos = {}, length = {}",
self.parser.src,
self.parser.pos,
self.parser.src.len()
);
None
}
}
#[cfg(test)]
mod tests {
use rowan::TextRange;
use crate::string_lexing::{
CharComponent,
CharComponentKind::*,
};
fn parse(src: &str) -> (bool, Vec<CharComponent>) {
let component_iterator = &mut super::parse_char_literal(src);
let components: Vec<_> = component_iterator.collect();
(component_iterator.has_closing_quote, components)
}
fn unclosed_char_component(src: &str) -> CharComponent {
let (has_closing_quote, components) = parse(src);
assert!(!has_closing_quote, "char should not have closing quote");
assert!(components.len() == 1);
components[0].clone()
}
fn closed_char_component(src: &str) -> CharComponent {
let (has_closing_quote, components) = parse(src);
assert!(has_closing_quote, "char should have closing quote");
assert!(
components.len() == 1,
"Literal: {}\nComponents: {:#?}",
src,
components
);
components[0].clone()
}
fn closed_char_components(src: &str) -> Vec<CharComponent> {
let (has_closing_quote, components) = parse(src);
assert!(has_closing_quote, "char should have closing quote");
components
}
fn range_closed(src: &str) -> TextRange {
TextRange::from_to(1.into(), (src.len() as u32 - 1).into())
}
fn range_unclosed(src: &str) -> TextRange {
TextRange::from_to(1.into(), (src.len() as u32).into())
}
#[test]
fn test_unicode_escapes() {
let unicode_escapes = &[r"{DEAD}", "{BEEF}", "{FF}", "{}", ""];
for escape in unicode_escapes {
let escape_sequence = format!(r"'\u{}'", escape);
let component = closed_char_component(&escape_sequence);
let expected_range = range_closed(&escape_sequence);
assert_eq!(component.kind, UnicodeEscape);
assert_eq!(component.range, expected_range);
}
}
#[test]
fn test_unicode_escapes_unclosed() {
let unicode_escapes = &["{DEAD", "{BEEF", "{FF"];
for escape in unicode_escapes {
let escape_sequence = format!(r"'\u{}'", escape);
let component = unclosed_char_component(&escape_sequence);
let expected_range = range_unclosed(&escape_sequence);
assert_eq!(component.kind, UnicodeEscape);
assert_eq!(component.range, expected_range);
}
}
#[test]
fn test_empty_char() {
let (has_closing_quote, components) = parse("''");
assert!(has_closing_quote, "char should have closing quote");
assert!(components.len() == 0);
}
#[test]
fn test_unclosed_char() {
let component = unclosed_char_component("'a");
assert!(component.kind == CodePoint);
assert!(component.range == TextRange::from_to(1.into(), 2.into()));
}
#[test]
fn test_digit_escapes() {
let literals = &[r"", r"5", r"55"];
for literal in literals {
let lit_text = format!(r"'\x{}'", literal);
let component = closed_char_component(&lit_text);
assert!(component.kind == AsciiCodeEscape);
assert!(component.range == range_closed(&lit_text));
}
// More than 2 digits starts a new codepoint
let components = closed_char_components(r"'\x555'");
assert!(components.len() == 2);
assert!(components[1].kind == CodePoint);
}
#[test]
fn test_ascii_escapes() {
let literals = &[
r"\'", "\\\"", // equivalent to \"
r"\n", r"\r", r"\t", r"\\", r"\0",
];
for literal in literals {
let lit_text = format!("'{}'", literal);
let component = closed_char_component(&lit_text);
assert!(component.kind == AsciiEscape);
assert!(component.range == range_closed(&lit_text));
}
}
#[test]
fn test_no_escapes() {
let literals = &['"', 'n', 'r', 't', '0', 'x', 'u'];
for &literal in literals {
let lit_text = format!("'{}'", literal);
let component = closed_char_component(&lit_text);
assert!(component.kind == CodePoint);
assert!(component.range == range_closed(&lit_text));
}
}
}
|
