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Merge pull request #353 from schungx/master

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Add scientific notation and rounding functions to Decimal.
This commit is contained in:
Stephen Chung 2021-02-15 17:15:18 +08:00 committed by GitHub
commit ce3565271b
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2 changed files with 41 additions and 44 deletions
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70
src/packages/math_basic.rs
View File

@ -302,7 +302,10 @@ mod float_functions {
#[cfg(feature = "decimal")]
#[export_module]
mod decimal_functions {
use rust_decimal::Decimal;
use rust_decimal::{
prelude::{FromStr, RoundingStrategy},
Decimal,
};
#[rhai_fn(name = "floor", get = "floor")]
pub fn floor(x: Decimal) -> Decimal {
@ -316,14 +319,11 @@ mod decimal_functions {
pub fn round(x: Decimal) -> Decimal {
x.round()
}
#[rhai_fn(return_raw)]
#[rhai_fn(name = "round", return_raw)]
pub fn round_dp(x: Decimal, dp: INT) -> Result<Dynamic, Box<EvalAltResult>> {
if cfg!(not(feature = "unchecked")) {
if cfg!(not(feature = "only_i32")) && dp > (u32::MAX as INT) {
return Err(make_err(format!(
"Decimal value {} round to too many decimal points: {}",
x, dp
)));
return Ok(x.into());
}
if dp < 0 {
return Err(make_err(format!(
@ -333,16 +333,13 @@ mod decimal_functions {
}
}
Ok(Dynamic::from(x.round_dp(dp as u32)))
Ok(x.round_dp(dp as u32).into())
}
#[rhai_fn(return_raw)]
pub fn round_up(x: Decimal, dp: INT) -> Result<Dynamic, Box<EvalAltResult>> {
if cfg!(not(feature = "unchecked")) {
if cfg!(not(feature = "only_i32")) && dp > (u32::MAX as INT) {
return Err(make_err(format!(
"Decimal value {} round to too many decimal points: {}",
x, dp
)));
return Ok(x.into());
}
if dp < 0 {
return Err(make_err(format!(
@ -352,19 +349,16 @@ mod decimal_functions {
}
}
Ok(Dynamic::from(x.round_dp_with_strategy(
dp as u32,
rust_decimal::prelude::RoundingStrategy::RoundUp,
)))
Ok(
x.round_dp_with_strategy(dp as u32, RoundingStrategy::RoundUp)
.into(),
)
}
#[rhai_fn(return_raw)]
pub fn round_down(x: Decimal, dp: INT) -> Result<Dynamic, Box<EvalAltResult>> {
if cfg!(not(feature = "unchecked")) {
if cfg!(not(feature = "only_i32")) && dp > (u32::MAX as INT) {
return Err(make_err(format!(
"Decimal value {} round to too many decimal points: {}",
x, dp
)));
return Ok(x.into());
}
if dp < 0 {
return Err(make_err(format!(
@ -374,19 +368,16 @@ mod decimal_functions {
}
}
Ok(Dynamic::from(x.round_dp_with_strategy(
dp as u32,
rust_decimal::prelude::RoundingStrategy::RoundDown,
)))
Ok(
x.round_dp_with_strategy(dp as u32, RoundingStrategy::RoundDown)
.into(),
)
}
#[rhai_fn(return_raw)]
pub fn round_half_up(x: Decimal, dp: INT) -> Result<Dynamic, Box<EvalAltResult>> {
if cfg!(not(feature = "unchecked")) {
if cfg!(not(feature = "only_i32")) && dp > (u32::MAX as INT) {
return Err(make_err(format!(
"Decimal value {} round to too many decimal points: {}",
x, dp
)));
return Ok(x.into());
}
if dp < 0 {
return Err(make_err(format!(
@ -396,19 +387,16 @@ mod decimal_functions {
}
}
Ok(Dynamic::from(x.round_dp_with_strategy(
dp as u32,
rust_decimal::prelude::RoundingStrategy::RoundHalfUp,
)))
Ok(
x.round_dp_with_strategy(dp as u32, RoundingStrategy::RoundHalfUp)
.into(),
)
}
#[rhai_fn(return_raw)]
pub fn round_half_down(x: Decimal, dp: INT) -> Result<Dynamic, Box<EvalAltResult>> {
if cfg!(not(feature = "unchecked")) {
if cfg!(not(feature = "only_i32")) && dp > (u32::MAX as INT) {
return Err(make_err(format!(
"Decimal value {} round to too many decimal points: {}",
x, dp
)));
return Ok(x.into());
}
if dp < 0 {
return Err(make_err(format!(
@ -418,10 +406,10 @@ mod decimal_functions {
}
}
Ok(Dynamic::from(x.round_dp_with_strategy(
dp as u32,
rust_decimal::prelude::RoundingStrategy::RoundHalfDown,
)))
Ok(
x.round_dp_with_strategy(dp as u32, RoundingStrategy::RoundHalfDown)
.into(),
)
}
#[rhai_fn(name = "int", get = "int")]
pub fn int(x: Decimal) -> Decimal {
@ -433,8 +421,8 @@ mod decimal_functions {
}
#[rhai_fn(return_raw)]
pub fn parse_decimal(s: &str) -> Result<Dynamic, Box<EvalAltResult>> {
s.trim()
.parse::<Decimal>()
Decimal::from_str(s)
.or_else(|_| Decimal::from_scientific(s))
.map(Into::<Dynamic>::into)
.map_err(|err| {
EvalAltResult::ErrorArithmetic(

15
src/token.rs
View File

@ -22,6 +22,10 @@ use rust_decimal::Decimal;
type LERR = LexError;
/// Separator character for numbers.
const NUM_SEP: char = '_';
/// A stream of tokens.
pub type TokenStream<'a, 't> = Peekable<TokenIterator<'a, 't>>;
/// A location (line number + character position) in the input script.
@ -1079,7 +1083,7 @@ fn get_next_token_inner(
while let Some(next_char) = stream.peek_next() {
match next_char {
ch if valid(ch) || ch == '_' => {
ch if valid(ch) || ch == NUM_SEP => {
result.push(next_char);
eat_next(stream, pos);
}
@ -1174,7 +1178,7 @@ fn get_next_token_inner(
// Parse number
if let Some(radix) = radix_base {
let out: String = result.iter().skip(2).filter(|&&c| c != '_').collect();
let out: String = result.iter().skip(2).filter(|&&c| c != NUM_SEP).collect();
return Some((
INT::from_str_radix(&out, radix)
@ -1185,7 +1189,7 @@ fn get_next_token_inner(
start_pos,
));
} else {
let out: String = result.iter().filter(|&&c| c != '_').collect();
let out: String = result.iter().filter(|&&c| c != NUM_SEP).collect();
let num = INT::from_str(&out).map(Token::IntegerConstant);
// If integer parsing is unnecessary, try float instead
@ -1197,6 +1201,11 @@ fn get_next_token_inner(
#[cfg(feature = "decimal")]
let num = num.or_else(|_| Decimal::from_str(&out).map(Token::DecimalConstant));
// Then try decimal in scientific notation
#[cfg(feature = "decimal")]
let num =
num.or_else(|_| Decimal::from_scientific(&out).map(Token::DecimalConstant));
return Some((
num.unwrap_or_else(|_| {
Token::LexError(LERR::MalformedNumber(result.into_iter().collect()))