Add new SI prefixes

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Added the new SI unit prefixes `QUECTO`, `RONTO`, `RONNA`, and `QUETTA`. [#49](https://github.com/itt-ustutt/quantity/pull/49)
 
 ## [0.5.1] - 2022-06-08
 ### Added

si-units/docs/api.rst

@@ -96,6 +96,8 @@ All units can be combined with the following prefixes:
     .. autoclass:: ATTO, :math:`\text{a}`, :math:`10^{-18}`, .. autoclass:: EXA, :math:`\text{E}`, :math:`10^{18}`
     .. autoclass:: ZEPTO, :math:`\text{z}`, :math:`10^{-21}`, .. autoclass:: ZETTA, :math:`\text{Z}`, :math:`10^{21}`
     .. autoclass:: YOCTO, :math:`\text{y}`, :math:`10^{-24}`, .. autoclass:: YOTTA, :math:`\text{Y}`, :math:`10^{24}`
+    .. autoclass:: RONTO, :math:`\text{r}`, :math:`10^{-27}`, .. autoclass:: RONNA, :math:`\text{R}`, :math:`10^{27}`
+    .. autoclass:: QUECTO, :math:`\text{q}`, :math:`10^{-30}`, .. autoclass:: QUETTA, :math:`\text{Q}`, :math:`10^{30}`
 
 Datatypes
 ~~~~~~~~~

src/python/mod.rs

@@ -129,6 +129,8 @@ pub fn quantity(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add("G", G)?;
     m.add("RGAS", RGAS)?;
 
+    m.add("QUECTO", crate::si::QUECTO)?;
+    m.add("RONTO", crate::si::RONTO)?;
     m.add("YOCTO", crate::si::YOCTO)?;
     m.add("ZEPTO", crate::si::ZEPTO)?;
     m.add("ATTO", crate::si::ATTO)?;
@@ -149,5 +151,7 @@ pub fn quantity(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add("EXA", crate::si::EXA)?;
     m.add("ZETTA", crate::si::ZETTA)?;
     m.add("YOTTA", crate::si::YOTTA)?;
+    m.add("RONNA", crate::si::RONNA)?;
+    m.add("QUETTA", crate::si::QUETTA)?;
     Ok(())
 }

src/si.rs

@@ -80,6 +80,8 @@
 //! [ATTO] | $\text{a}$ | $10^{-18}$ | | [EXA] | $\text{E}$ | $10^{18}$
 //! [ZEPTO] | $\text{z}$ | $10^{-21}$ | | [ZETTA] | $\text{Z}$ | $10^{21}$
 //! [YOCTO] | $\text{y}$ | $10^{-24}$ | | [YOTTA] | $\text{Y}$ | $10^{24}$
+//! [RONTO] | $\text{r}$ | $10^{-27}$ | | [RONNA] | $\text{R}$ | $10^{27}$
+//! [QUECTO] | $\text{q}$ | $10^{-30}$ | | [QUETTA] | $\text{Q}$ | $10^{30}$
 use super::{Quantity, QuantityError, Unit};
 use ang::{Angle, Degrees, Radians};
 use ndarray::*;
@@ -439,6 +441,10 @@ pub const RADIANS: Angle = Radians(1.0);
 /// Angle unit degree $\\left(1^\\circ=\frac{\pi}{180}\\,\text{rad}\\approx 0.0174532925\\,\text{rad}\\right)$
 pub const DEGREES: Angle = Degrees(1.0);
 
+/// Prefix quecto $\\left(\text{q}=10^{-30}\\right)$
+pub const QUECTO: f64 = 1e-30;
+/// Prefix ronto $\\left(\text{r}=10^{-27}\\right)$
+pub const RONTO: f64 = 1e-27;
 /// Prefix yocto $\\left(\text{y}=10^{-24}\\right)$
 pub const YOCTO: f64 = 1e-24;
 /// Prefix zepto $\\left(\text{z}=10^{-21}\\right)$
@@ -479,6 +485,10 @@ pub const EXA: f64 = 1e18;
 pub const ZETTA: f64 = 1e21;
 /// Prefix yotta $\\left(\text{Y}=10^{24}\\right)$
 pub const YOTTA: f64 = 1e24;
+/// Prefix ronna $\\left(\text{R}=10^{27}\\right)$
+pub const RONNA: f64 = 1e27;
+/// Prefix quetta $\\left(\text{Q}=10^{30}\\right)$
+pub const QUETTA: f64 = 1e30;
 
 /// Additional unit celsius
 pub struct CELSIUS;

src/si_fmt.rs

@@ -65,11 +65,11 @@ impl SINumber {
         if DERIVED_UNITS.contains_key(&self.unit) && !self.is_nan() {
             let (unit, _, has_prefix, symbols, exponents) = DERIVED_UNITS.get(&self.unit).unwrap();
             let (value, prefix) = get_prefix(self.to_reduced(*unit).unwrap(), *has_prefix);
-            return format!(
+            format!(
                 "{}\\,{}",
                 float_to_latex(value),
                 &unit_to_latex(symbols, exponents, Some(prefix))
-            );
+            )
         } else {
             format!("{}\\,{}", float_to_latex(self.value), &self.unit.to_latex())
         }