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Allow underscores in integers and floats (#7759)

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# Description

This PR makes changes that allow underscores in numbers.

Example:
```nu
# allows underscores to be placed arbitrarily to enhance readability.
let pi = 3.1415_9265_3589_793

# works with integers
let num = 1_000_000_000_000
let fav_color = 0x68_9d_6a
```
This commit is contained in:
mike
2023-01-15 18:03:57 +03:00
committed by GitHub
parent 7221eb7f39
commit 56a9eab7eb
3 changed files with 73 additions and 48 deletions
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73
crates/nu-parser/src/parser.rs
View File

@ -1329,12 +1329,19 @@ fn decode_with_base(s: &str, base: u32, digits_per_byte: usize) -> Result<Vec<u8
.collect()
}
fn strip_underscores(token: &[u8]) -> String {
String::from_utf8_lossy(token)
.chars()
.filter(|c| *c != '_')
.collect()
}
pub fn parse_int(token: &[u8], span: Span) -> (Expression, Option<ParseError>) {
if let Some(token) = token.strip_prefix(b"0x") {
if let Ok(v) = i64::from_str_radix(&String::from_utf8_lossy(token), 16) {
fn extract_int(token: &str, span: Span, radix: u32) -> (Expression, Option<ParseError>) {
if let Ok(num) = i64::from_str_radix(token, radix) {
(
Expression {
expr: Expr::Int(v),
expr: Expr::Int(num),
span,
ty: Type::Int,
custom_completion: None,
@ -1351,52 +1358,20 @@ pub fn parse_int(token: &[u8], span: Span) -> (Expression, Option<ParseError>) {
)),
)
}
} else if let Some(token) = token.strip_prefix(b"0b") {
if let Ok(v) = i64::from_str_radix(&String::from_utf8_lossy(token), 2) {
(
Expression {
expr: Expr::Int(v),
span,
ty: Type::Int,
custom_completion: None,
},
None,
)
} else {
(
garbage(span),
Some(ParseError::Mismatch(
"int".into(),
"incompatible int".into(),
span,
)),
)
}
} else if let Some(token) = token.strip_prefix(b"0o") {
if let Ok(v) = i64::from_str_radix(&String::from_utf8_lossy(token), 8) {
(
Expression {
expr: Expr::Int(v),
span,
ty: Type::Int,
custom_completion: None,
},
None,
)
} else {
(
garbage(span),
Some(ParseError::Mismatch(
"int".into(),
"incompatible int".into(),
span,
)),
)
}
} else if let Ok(x) = String::from_utf8_lossy(token).parse::<i64>() {
}
let token = strip_underscores(token);
if let Some(num) = token.strip_prefix("0b") {
extract_int(num, span, 2)
} else if let Some(num) = token.strip_prefix("0o") {
extract_int(num, span, 8)
} else if let Some(num) = token.strip_prefix("0x") {
extract_int(num, span, 16)
} else if let Ok(num) = token.parse::<i64>() {
(
Expression {
expr: Expr::Int(x),
expr: Expr::Int(num),
span,
ty: Type::Int,
custom_completion: None,
@ -1412,7 +1387,9 @@ pub fn parse_int(token: &[u8], span: Span) -> (Expression, Option<ParseError>) {
}
pub fn parse_float(token: &[u8], span: Span) -> (Expression, Option<ParseError>) {
if let Ok(x) = String::from_utf8_lossy(token).parse::<f64>() {
let token = strip_underscores(token);
if let Ok(x) = token.parse::<f64>() {
(
Expression {
expr: Expr::Float(x),