1 use syntax::{ast, ast::Radix, AstToken};
3 use crate::{AssistContext, AssistId, AssistKind, Assists, GroupLabel};
5 const MIN_NUMBER_OF_DIGITS_TO_FORMAT: usize = 5;
7 // Assist: reformat_number_literal
9 // Adds or removes seprators from integer literal.
12 // const _: i32 = 1012345$0;
16 // const _: i32 = 1_012_345;
18 pub(crate) fn reformat_number_literal(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
19 let literal = ctx.find_node_at_offset::<ast::Literal>()?;
20 let literal = match literal.kind() {
21 ast::LiteralKind::IntNumber(it) => it,
25 let text = literal.text();
26 if text.contains('_') {
27 return remove_separators(acc, literal);
30 let (prefix, value, suffix) = literal.split_into_parts();
31 if value.len() < MIN_NUMBER_OF_DIGITS_TO_FORMAT {
35 let radix = literal.radix();
36 let mut converted = prefix.to_string();
37 converted.push_str(&add_group_separators(value, group_size(radix)));
38 converted.push_str(suffix);
40 let group_id = GroupLabel("Reformat number literal".into());
41 let label = format!("Convert {} to {}", literal, converted);
42 let range = literal.syntax().text_range();
45 AssistId("reformat_number_literal", AssistKind::RefactorInline),
48 |builder| builder.replace(range, converted),
52 fn remove_separators(acc: &mut Assists, literal: ast::IntNumber) -> Option<()> {
53 let group_id = GroupLabel("Reformat number literal".into());
54 let range = literal.syntax().text_range();
57 AssistId("reformat_number_literal", AssistKind::RefactorInline),
58 "Remove digit seprators",
60 |builder| builder.replace(range, literal.text().replace("_", "")),
64 const fn group_size(r: Radix) -> usize {
69 Radix::Hexadecimal => 4,
73 fn add_group_separators(s: &str, group_size: usize) -> String {
74 let mut chars = Vec::new();
75 for (i, ch) in s.chars().filter(|&ch| ch != '_').rev().enumerate() {
76 if i > 0 && i % group_size == 0 {
82 chars.into_iter().rev().collect()
87 use crate::tests::{check_assist_by_label, check_assist_not_applicable, check_assist_target};
92 fn group_separators() {
99 ("12345", 4, "1_2345"),
100 ("123456", 4, "12_3456"),
101 ("1234567", 4, "123_4567"),
102 ("12345678", 4, "1234_5678"),
103 ("123456789", 4, "1_2345_6789"),
104 ("1234567890", 4, "12_3456_7890"),
105 ("1_2_3_4_5_6_7_8_9_0_", 4, "12_3456_7890"),
106 ("1234567890", 3, "1_234_567_890"),
107 ("1234567890", 2, "12_34_56_78_90"),
108 ("1234567890", 1, "1_2_3_4_5_6_7_8_9_0"),
112 let (input, group_size, expected) = case;
113 assert_eq!(add_group_separators(input, group_size), expected)
120 ("const _: i32 = 0b11111$0", "0b11111"),
121 ("const _: i32 = 0o77777$0;", "0o77777"),
122 ("const _: i32 = 10000$0;", "10000"),
123 ("const _: i32 = 0xFFFFF$0;", "0xFFFFF"),
124 ("const _: i32 = 10000i32$0;", "10000i32"),
125 ("const _: i32 = 0b_10_0i32$0;", "0b_10_0i32"),
129 check_assist_target(reformat_number_literal, case.0, case.1);
136 "const _: i32 = 0b111$0",
137 "const _: i32 = 0b1111$0",
138 "const _: i32 = 0o77$0;",
139 "const _: i32 = 0o777$0;",
140 "const _: i32 = 10$0;",
141 "const _: i32 = 999$0;",
142 "const _: i32 = 0xFF$0;",
143 "const _: i32 = 0xFFFF$0;",
147 check_assist_not_applicable(reformat_number_literal, case);
154 ("const _: i32 = 10000$0", "const _: i32 = 10_000", "Convert 10000 to 10_000"),
156 "const _: i32 = 0xFF0000$0;",
157 "const _: i32 = 0xFF_0000;",
158 "Convert 0xFF0000 to 0xFF_0000",
161 "const _: i32 = 0b11111111$0;",
162 "const _: i32 = 0b1111_1111;",
163 "Convert 0b11111111 to 0b1111_1111",
166 "const _: i32 = 0o377211$0;",
167 "const _: i32 = 0o377_211;",
168 "Convert 0o377211 to 0o377_211",
171 "const _: i32 = 10000i32$0;",
172 "const _: i32 = 10_000i32;",
173 "Convert 10000i32 to 10_000i32",
175 ("const _: i32 = 1_0_0_0_i32$0;", "const _: i32 = 1000i32;", "Remove digit seprators"),
179 let (before, after, label) = case;
180 check_assist_by_label(reformat_number_literal, before, after, label);