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/// A Haystack number.
#[derive(Clone, Debug, PartialEq)]
pub enum Number {
Basic(BasicNumber),
Scientific(ScientificNumber),
}
impl std::fmt::Display for Number {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Basic(num) => write!(f, "{}", num),
Self::Scientific(ex) => write!(f, "{}", ex),
}
}
}
impl Number {
/// Create a new `Number`. If present, the unit should
/// be a valid unit string from Project Haystack's
/// unit database.
pub fn new(value: f64, unit: Option<String>) -> Self {
Number::Basic(BasicNumber::new(value, unit))
}
/// Create a new `Number` and no unit.
pub fn new_unitless(value: f64) -> Self {
Self::new(value, None)
}
/// Create a new scientific notation `Number`. If present, the unit should
/// be a valid unit string from Project Haystack's
/// unit database.
pub fn new_scientific(
significand: f64,
exponent: i32,
unit: Option<String>,
) -> Option<Self> {
Some(Number::Scientific(ScientificNumber::new(
significand,
exponent,
unit,
)?))
}
/// Create a new scientific notation `Number` and no unit.
pub fn new_scientific_unitless(
significand: f64,
exponent: i32,
) -> Option<Self> {
Self::new_scientific(significand, exponent, None)
}
/// If this represents a non-scientific notation number, return the number.
pub fn as_number(&self) -> Option<&BasicNumber> {
match self {
Self::Basic(number) => Some(number),
_ => None,
}
}
/// If this represents a number in scientific notation,
/// return the scientific notation number.
pub fn as_scientific_number(&self) -> Option<&ScientificNumber> {
match self {
Self::Scientific(ex) => Some(ex),
_ => None,
}
}
/// Return the unit component of this `Number`, if present.
pub fn unit(&self) -> Option<&str> {
match self {
Self::Basic(num) => num.unit(),
Self::Scientific(ex) => ex.unit(),
}
}
/// Return a string containing Axon code representing this number.
pub fn to_axon_code(&self) -> String {
match self {
Self::Basic(num) => num.to_axon_code(),
Self::Scientific(ex) => ex.to_axon_code(),
}
}
}
/// A Haystack Number, encapsulating a scalar value and
/// an optional unit value. The unit is represented as a
/// string. This does not represent Haystack scientific notation numbers.
#[derive(Clone, Debug, PartialEq)]
pub struct BasicNumber {
value: f64,
unit: Option<String>,
}
impl BasicNumber {
/// Create a new `BasicNumber`. If present, the unit should
/// be a valid unit string from Project Haystack's
/// unit database.
pub fn new(value: f64, unit: Option<String>) -> Self {
Self { value, unit }
}
/// Create a new `BasicNumber` with no unit.
pub fn new_unitless(value: f64) -> Self {
Self::new(value, None)
}
/// Return the numeric component of this number.
pub fn value(&self) -> f64 {
self.value
}
/// Return the unit component of this number, if present.
pub fn unit(&self) -> Option<&str> {
self.unit.as_ref().map(|unit| unit.as_ref())
}
/// Return a string containing Axon code representing this number.
pub fn to_axon_code(&self) -> String {
let value = self.value();
if let Some(unit) = self.unit() {
if value.is_nan() {
format!("nan().as(\"{}\")", unit)
} else if value.is_infinite() && value.is_sign_positive() {
format!("posInf().as(\"{}\")", unit)
} else if value.is_infinite() && value.is_sign_negative() {
format!("negInf().as(\"{}\")", unit)
} else {
format!("{}{}", value, unit)
}
} else {
if value.is_nan() {
"nan()".to_owned()
} else if value.is_infinite() && value.is_sign_positive() {
"posInf()".to_owned()
} else if value.is_infinite() && value.is_sign_negative() {
"negInf()".to_owned()
} else {
format!("{}", value)
}
}
}
}
impl std::fmt::Display for BasicNumber {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let value = self.value();
if value.is_nan() {
if let Some(unit) = self.unit() {
write!(f, "NaN {}", unit)
} else {
write!(f, "NaN")
}
} else if value.is_infinite() && value.is_sign_positive() {
if let Some(unit) = self.unit() {
write!(f, "INF {}", unit)
} else {
write!(f, "INF")
}
} else if value.is_infinite() && value.is_sign_negative() {
if let Some(unit) = self.unit() {
write!(f, "-INF {}", unit)
} else {
write!(f, "-INF")
}
} else if let Some(unit) = self.unit() {
write!(f, "{} {}", value, unit)
} else {
write!(f, "{}", value)
}
}
}
/// A Haystack scientific notation Number, encapsulating a value and
/// an optional unit value. The unit is represented as a
/// string.
#[derive(Clone, Debug, PartialEq)]
pub struct ScientificNumber {
significand: f64,
exponent: i32,
unit: Option<String>,
}
impl ScientificNumber {
/// Create a new `ScientificNumber`. If present, the unit should
/// be a valid unit string from Project Haystack's
/// unit database. The significand must be a finite number which is
/// not NaN.
pub fn new(
significand: f64,
exponent: i32,
unit: Option<String>,
) -> Option<Self> {
if significand.is_nan() || significand.is_infinite() {
None
} else {
Some(Self {
significand,
exponent,
unit,
})
}
}
/// Create a new `ScientificNumber` with no unit. The significand must
/// be a finite number which is not NaN.
pub fn new_unitless(significand: f64, exponent: i32) -> Option<Self> {
Self::new(significand, exponent, None)
}
/// Return the numeric significand component of this number.
pub fn significand(&self) -> f64 {
self.significand
}
/// Return the numeric exponent component of this number.
pub fn exponent(&self) -> i32 {
self.exponent
}
/// Return the unit component of this number, if present.
pub fn unit(&self) -> Option<&str> {
self.unit.as_ref().map(|unit| unit.as_ref())
}
/// Return a string containing Axon code representing this number.
pub fn to_axon_code(&self) -> String {
let exp = self.exponent();
let sig = self.significand();
if let Some(unit) = self.unit() {
format!("{}e{}{}", sig, exp, unit)
} else {
format!("{}e{}", sig, exp)
}
}
}
impl std::fmt::Display for ScientificNumber {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let exp = self.exponent();
let sig = self.significand();
if let Some(unit) = self.unit() {
write!(f, "{}e{} {}", sig, exp, unit)
} else {
write!(f, "{}e{}", sig, exp)
}
}
}