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Recipe Data model: Units

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target/

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
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"num-integer",
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[[package]]
name = "recipes"
version = "0.1.0"
dependencies = [
"num-rational",
]

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[workspace]
members = [ "recipes" ]

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[package]
name = "recipes"
version = "0.1.0"
authors = ["Jeremy Wall <jeremy@marzhillstudios.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies.num-rational]
version = "~0.4.0"

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// Copyright 2021 Jeremy Wall
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
pub mod unit;
use unit::*;
pub struct Recipe {
pub title: String,
pub desc: String,
pub steps: Vec<Step>,
}
pub struct Step {
pub prep_time: std::time::Duration,
pub instructions: String,
pub ingredients: Vec<Ingredient>,
}
pub enum Form {
Whole, // default
Chopped,
Minced,
Sliced,
Ground,
Custom(String),
}
pub struct Ingredient {
pub name: String,
pub amt: Measure,
pub form: Form,
pub category: String,
}
#[cfg(test)]
mod test;

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// Copyright 2021 Jeremy Wall
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::unit::*;
use VolumeMeasure::*;
use std::convert::Into;
use num_rational::Ratio;
#[test]
fn test_volume_measure_conversion() {
let gal = Gal(1.into());
assert_eq!(gal.into_qrt(), Qrt(4.into()));
assert_eq!(gal.into_pint(), Pint((4 * 2).into()));
assert_eq!(gal.into_cup(), Cup((4 * 2 * 2).into()));
assert_eq!(gal.into_tbsp(), Tbsp((4 * 2 * 2 * 16).into()));
assert_eq!(gal.into_tbsp(), Tsp((4 * 2 * 2 * 16 * 3).into()));
}
#[test]
fn test_quantity_math() {
// All frac
let half: Quantity = Ratio::new(1, 2).into();
assert_eq!(half + half, 1.into());
assert_eq!(half * half, Ratio::new(1, 4).into());
assert_eq!(half - half, 0.into());
assert_eq!(half / half, 1.into());
// Mix of whole and frac
assert_eq!(Quantity::from(2) * half, 1.into());
assert_eq!(half * Quantity::from(2), 1.into());
// All whole
assert_eq!(
Quantity::from(2) / Quantity::from(3),
Quantity::from(Ratio::new(2, 3))
);
}
#[test]
fn test_volume_math() {
let tsp = Tsp(1.into());
assert_eq!(tsp + tsp, Tsp(2.into()));
assert_eq!(tsp - tsp, Tsp(0.into()));
}
macro_rules! assert_normalize {
($typ:path, $conv:ident, $msg:expr) => {
if let $typ(qty) = dbg!($typ(1.into()).$conv().normalize()) {
assert_eq!(qty, 1.into());
} else {
assert!(false, $msg);
}
};
}
#[test]
fn test_volume_normalize() {
assert_normalize!(Tbsp, into_tsp, "not a tablespoon after normalize call");
assert_normalize!(Floz, into_tbsp, "not a floz after normalize call");
assert_normalize!(Cup, into_floz, "not a cup after normalize call");
assert_normalize!(Pint, into_cup, "not a pint after normalize call");
assert_normalize!(Qrt, into_pint, "not a qrt after normalize call");
assert_normalize!(Ltr, into_qrt, "not a ltr after normalize call");
assert_normalize!(Gal, into_ltr, "not a gal after normalize call");
assert_normalize!(Gal, into_tsp, "not a gal after normalize call");
}

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// Copyright 2021 Jeremy Wall
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*!
Numerical measures for Recipe ingredients with math defined for them.
Each of these types implement copy and have the common math operations
defined for them.
*/
use std::{
cmp::{Ordering, PartialEq, PartialOrd},
convert::TryFrom,
fmt::Display,
ops::{Add, Div, Mul, Sub},
};
use num_rational::Ratio;
#[derive(Copy, Clone, Debug)]
/// Volume Measurements for ingredients in a recipe.
pub enum VolumeMeasure {
// Imperial volume measurements. US.
/// Teaspoon measurements.
Tsp(Quantity), // 5 ml
/// Tablespoon measurements.
Tbsp(Quantity), // 15 ml
/// Cup measurements.
Cup(Quantity), // 240 ml
/// Pint Measurements
Pint(Quantity), // 475 ml
/// Quart measurements
Qrt(Quantity), // 950 ml
/// Gallon Measurements
Gal(Quantity), // 3800 ml
/// Fluid Ounces
Floz(Quantity), // 30 ml
/// Milliliter Measurements.
// Metric volume measurements.
ML(Quantity), // Base unit
Ltr(Quantity), // 1000 ml
}
use VolumeMeasure::{Cup, Floz, Gal, Ltr, Pint, Qrt, Tbsp, Tsp, ML};
// multiplier contants for various units into milliliter. Used in conversion functions.
const TSP: Quantity = Quantity::Whole(5);
const TBSP: Quantity = Quantity::Whole(15);
const FLOZ: Quantity = Quantity::Whole(30);
const CUP: Quantity = Quantity::Whole(240);
const PINT: Quantity = Quantity::Whole(480);
const QRT: Quantity = Quantity::Whole(960);
const LTR: Quantity = Quantity::Whole(1000);
const GAL: Quantity = Quantity::Whole(3840);
const ONE: Quantity = Quantity::Whole(1);
impl VolumeMeasure {
/// Get this measures `Quantity` as milliliters.
pub fn get_ml(&self) -> Quantity {
match self {
ML(qty) => *qty,
Tsp(qty) => *qty * TSP,
Tbsp(qty) => *qty * TBSP,
Floz(qty) => *qty * FLOZ,
Cup(qty) => *qty * CUP,
Pint(qty) => *qty * PINT,
Qrt(qty) => *qty * QRT,
Gal(qty) => *qty * GAL,
Ltr(qty) => *qty * LTR,
}
}
/// Convert into milliliters.
pub fn into_ml(self) -> Self {
ML(self.get_ml())
}
/// Convert into teaspoons.
pub fn into_tsp(self) -> Self {
Tsp(self.get_ml() / TSP)
}
/// Convert into tablespoons.
pub fn into_tbsp(self) -> Self {
Tbsp(self.get_ml() / TBSP)
}
/// Convert into fluid oz.
pub fn into_floz(self) -> Self {
Floz(self.get_ml() / FLOZ)
}
/// Convert into cups.
pub fn into_cup(self) -> Self {
Cup(self.get_ml() / CUP)
}
/// Convert into pints.
pub fn into_pint(self) -> Self {
Pint(self.get_ml() / PINT)
}
/// Convert into quarts.
pub fn into_qrt(self) -> Self {
Qrt(self.get_ml() / QRT)
}
/// Convert into gallons.
pub fn into_gal(self) -> Self {
Gal(self.get_ml() / GAL)
}
/// Convert into liters.
pub fn into_ltr(self) -> Self {
Ltr(self.get_ml() / LTR)
}
pub fn normalize(self) -> Self {
let ml = self.get_ml();
if (ml / GAL) >= ONE {
return self.into_gal();
}
if (ml / LTR) >= ONE {
return self.into_ltr();
}
if (ml / QRT) >= ONE {
return self.into_qrt();
}
if (ml / PINT) >= ONE {
return self.into_pint();
}
if (ml / CUP) >= ONE {
return self.into_cup();
}
if (ml / FLOZ) >= ONE {
return self.into_floz();
}
if (ml / TBSP) >= ONE {
return self.into_tbsp();
}
if (ml / TSP) >= ONE {
return self.into_tsp();
}
return self.into_ml();
}
}
macro_rules! volume_op {
($trait:ident, $method:ident) => {
impl $trait for VolumeMeasure {
type Output = Self;
fn $method(self, lhs: Self) -> Self::Output {
let (l, r) = (self.get_ml(), lhs.get_ml());
ML($trait::$method(l, r))
}
}
};
}
volume_op!(Add, add);
volume_op!(Sub, sub);
impl PartialEq for VolumeMeasure {
fn eq(&self, lhs: &Self) -> bool {
let rhs = self.get_ml();
let lhs = lhs.get_ml();
PartialEq::eq(&rhs, &lhs)
}
}
impl Display for VolumeMeasure {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Tsp(qty) => write!(f, "{} tsp", qty),
Tbsp(qty) => write!(f, "{} tbsp", qty),
Cup(qty) => write!(f, "{} cup", qty),
Pint(qty) => write!(f, "{} pint", qty),
Qrt(qty) => write!(f, "{} qrt", qty),
Gal(qty) => write!(f, "{} gal", qty),
Floz(qty) => write!(f, "{} floz", qty),
ML(qty) => write!(f, "{} ml", qty),
Ltr(qty) => write!(f, "{} ltr", qty),
}
}
}
#[derive(Copy, Clone, Debug)]
/// Measurements in a Recipe with associated units for them.
pub enum Measure {
/// Volume measurements as meter cubed base unit
Volume(VolumeMeasure),
/// Simple count of items
Count(Quantity),
/// Weight measure as Grams base unit
Gram(Quantity),
}
use Measure::{Count, Gram, Volume};
impl Measure {
pub fn tsp(qty: Quantity) -> Self {
Volume(Tsp(qty))
}
pub fn tbsp(qty: Quantity) -> Self {
Volume(Tbsp(qty))
}
pub fn cup(qty: Quantity) -> Self {
Volume(Cup(qty))
}
pub fn qrt(qty: Quantity) -> Self {
Volume(Qrt(qty))
}
pub fn pint(qty: Quantity) -> Self {
Volume(Pint(qty))
}
pub fn gal(qty: Quantity) -> Self {
Volume(Gal(qty))
}
pub fn count(qty: u32) -> Self {
Count(Whole(qty))
}
pub fn gram(qty: Quantity) -> Self {
Gram(qty)
}
}
impl Display for Measure {
fn fmt(&self, w: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Volume(vm) => write!(w, "{}", vm),
Count(qty) => write!(w, "{}", qty),
Gram(qty) => write!(w, "{} grams", qty),
}
}
}
/// Represents a Quantity for an ingredient of a recipe.
#[derive(Copy, Clone, Debug)]
pub enum Quantity {
/// Whole or non fractional quantities of an ingredient in a recipe.
Whole(u32),
/// Fractional quantities of an ingredient in a recipe.
Frac(Ratio<u32>),
}
impl Quantity {
/// Construct a `Whole` quantity.
pub fn whole(n: u32) -> Self {
Whole(n)
}
/// Construct a Fractional quantity.
pub fn frac(whole: u32, numer: u32, denom: u32) -> Self {
Frac(Ratio::from_integer(whole) + Ratio::new(numer, denom))
}
/// For `Frac` values if the `Quantity` is a whole number normalize the `Whole(n)` type.
/// Otherwise leave the `Quantity` untouched.
pub fn normalize(self) -> Self {
if let Frac(rat) = self {
if rat.is_integer() {
Whole(*rat.numer())
} else {
Frac(rat)
}
} else {
self
}
}
/// Extract out the whole and the fractional parts of a `Quantity`.
pub fn extract_parts(self) -> (u32, Ratio<u32>) {
match self {
Whole(v) => (v, Ratio::new(0, 1)),
Frac(v) => (v.to_integer(), v.fract()),
}
}
/// Approximate a quantity as a float. This will lose precision in the case
/// of fractional quantities.
pub fn approx_f32(self) -> f32 {
match self {
Whole(v) => v as f32,
Frac(v) => (*v.numer() / *v.denom()) as f32,
}
}
}
use Quantity::{Frac, Whole};
pub struct ConversionError {
pub err_message: String,
}
impl From<Ratio<u32>> for Quantity {
fn from(r: Ratio<u32>) -> Self {
Quantity::Frac(r).normalize()
}
}
impl From<u32> for Quantity {
fn from(u: u32) -> Self {
Quantity::Whole(u)
}
}
impl TryFrom<f32> for Quantity {
type Error = ConversionError;
fn try_from(f: f32) -> Result<Self, Self::Error> {
Ratio::approximate_float(f)
.map(|rat: Ratio<i32>| Frac(Ratio::new(*rat.numer() as u32, *rat.denom() as u32)))
.ok_or_else(|| ConversionError {
err_message: format!("Cannot Convert {} into a Rational", f),
})
}
}
macro_rules! quantity_op {
($trait:ident, $method:ident) => {
impl $trait for Quantity {
type Output = Self;
fn $method(self, lhs: Self) -> Self::Output {
match (self, lhs) {
(Whole(rhs), Whole(lhs)) => Frac($trait::$method(
Ratio::from_integer(rhs),
Ratio::from_integer(lhs),
)),
(Frac(rhs), Frac(lhs)) => Frac($trait::$method(rhs, lhs)),
(Whole(rhs), Frac(lhs)) => Frac($trait::$method(Ratio::from_integer(rhs), lhs)),
(Frac(rhs), Whole(lhs)) => Frac($trait::$method(rhs, Ratio::from_integer(lhs))),
}
}
}
};
}
quantity_op!(Add, add);
quantity_op!(Sub, sub);
quantity_op!(Mul, mul);
quantity_op!(Div, div);
impl PartialOrd for Quantity {
fn partial_cmp(&self, lhs: &Self) -> Option<Ordering> {
match (self, lhs) {
(Whole(rhs), Whole(lhs)) => PartialOrd::partial_cmp(rhs, lhs),
(Frac(rhs), Frac(lhs)) => PartialOrd::partial_cmp(rhs, lhs),
(Whole(rhs), Frac(lhs)) => PartialOrd::partial_cmp(&Ratio::from_integer(*rhs), lhs),
(Frac(rhs), Whole(lhs)) => PartialOrd::partial_cmp(rhs, &Ratio::from_integer(*lhs)),
}
}
}
impl PartialEq for Quantity {
fn eq(&self, lhs: &Self) -> bool {
match (self, lhs) {
(Whole(rhs), Whole(lhs)) => PartialEq::eq(rhs, lhs),
(Frac(rhs), Frac(lhs)) => PartialEq::eq(rhs, lhs),
(Whole(rhs), Frac(lhs)) => PartialEq::eq(&Ratio::from_integer(*rhs), lhs),
(Frac(rhs), Whole(lhs)) => PartialEq::eq(rhs, &Ratio::from_integer(*lhs)),
}
}
}
impl Display for Quantity {
fn fmt(&self, w: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self.normalize() {
Whole(v) => write!(w, "{}", v),
Frac(_) => {
let (whole, frac) = self.extract_parts();
if whole == 0 {
write!(w, "{}/{}", frac.numer(), frac.denom())
} else {
write!(w, "{} {}/{}", whole, frac.numer(), frac.denom())
}
}
}
}
}