Add support for cubic inches

src/conversions.rs

@@ -85,6 +85,12 @@ fn get_conversion(unit: NonMetric) -> Conversion {
 			from: inch_from * inch_from,
 			to: MetricQuantity { amount: 1760.0 * 3.0 * 12.0 * inch_to * 1760.0 * 3.0 * 12.0 * inch_to, unit: Metric::SquareMetre },
 		},
+		// Volume
+		NonMetric::CubicInch => Conversion {
+			offset: 0.0,
+			from: inch_from * inch_from * inch_from,
+			to: MetricQuantity { amount: inch_to * inch_to * inch_to, unit: Metric::CubicMetre },
+		},
 	}
 }
 
@@ -144,6 +150,14 @@ mod test {
 		run_tests(&tests, Metric::SquareMetre);
 	}
 
+	#[test]
+	fn volume() {
+		let tests = [
+			Test(NonMetric::CubicInch, 1.6387064e-5),
+		];
+		run_tests(&tests, Metric::CubicMetre);
+	}
+
 	fn run_tests(tests: &[Test], unit: Metric) {
 		for test in tests {
 			let from = NonMetricQuantity {

src/format.rs

@@ -95,6 +95,17 @@ fn prefixed_unit(quantity: MetricQuantity) -> PrefixedUnit {
 				return PrefixedUnit(0.001 * 0.001, "mm²");
 			}
 		}
+		Metric::CubicMetre => {
+			if absolute >= 1000.0 * 1000.0 * 1000.0 {
+				return PrefixedUnit(1000.0 * 1000.0 * 1000.0, "km³");
+			} else if absolute >= 1.0 {
+				return PrefixedUnit(1.0, "m³");
+			} else if absolute >= 0.000_001 { // 0.01 * 0.01 * 0.01 rounds wrong
+				return PrefixedUnit(0.000_001, "cm³");
+			} else {
+				return PrefixedUnit(0.001 * 0.001 * 0.001, "mm³");
+			}
+		}
 	}
 }
 
@@ -341,4 +352,44 @@ mod test {
 			unit: Metric::SquareMetre,
 		}));
 	}
+
+	#[test]
+	fn cubic_metres() {
+		assert_eq!(PrefixedUnit(0.000_000_001, "mm³"), prefixed_unit(MetricQuantity {
+			amount: 0.000_000_000_1,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(0.000_000_001, "mm³"), prefixed_unit(MetricQuantity {
+			amount: 0.000_000_001,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(0.000_000_001, "mm³"), prefixed_unit(MetricQuantity {
+			amount: 0.000_000_1,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(0.000_001, "cm³"), prefixed_unit(MetricQuantity {
+			amount: 0.000_001,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(0.000_001, "cm³"), prefixed_unit(MetricQuantity {
+			amount: 0.1,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(1.0, "m³"), prefixed_unit(MetricQuantity {
+			amount: 1.0,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(1.0, "m³"), prefixed_unit(MetricQuantity {
+			amount: 100_000_000.0,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(1_000_000_000.0, "km³"), prefixed_unit(MetricQuantity {
+			amount: 1_000_000_000.0,
+			unit: Metric::CubicMetre,
+		}));
+		assert_eq!(PrefixedUnit(1_000_000_000.0, "km³"), prefixed_unit(MetricQuantity {
+			amount: 10_000_000_000.0,
+			unit: Metric::CubicMetre,
+		}));
+	}
 }

src/lib.rs

@@ -81,6 +81,8 @@ fn unit_to_name(unit: NonMetric) -> &'static str {
 		NonMetric::SquareFoot => "square feet",
 		NonMetric::Acre => "acres",
 		NonMetric::SquareMile => "square miles",
+		// Volume
+		NonMetric::CubicInch => "cubic inches",
 	}
 }
 
@@ -119,5 +121,7 @@ mod test {
 		assert_eq!(run("1 ft²"), Ok("929 cm²".to_string()));
 		assert_eq!(run("1 acre"), Ok("4 047 m²".to_string()));
 		assert_eq!(run("1 mi²"), Ok("2.59 km²".to_string()));
+		// Volume
+		assert_eq!(run("1 in³"), Ok("16.39 cm³".to_string()));
 	}
 }

src/parse.rs

@@ -158,6 +158,20 @@ fn parse_unit(input: String) -> Result<NonMetric, ParseError> {
 		"miles^2" => Ok(NonMetric::SquareMile),
 		"mi^2" => Ok(NonMetric::SquareMile),
 
+		// Volume
+		"cubic inch" => Ok(NonMetric::CubicInch),
+		"cubic inches" => Ok(NonMetric::CubicInch),
+		"cubic in" => Ok(NonMetric::CubicInch),
+		"cu inch" => Ok(NonMetric::CubicInch),
+		"cu inches" => Ok(NonMetric::CubicInch),
+		"cu in" => Ok(NonMetric::CubicInch),
+		"inch³" => Ok(NonMetric::CubicInch),
+		"inches³" => Ok(NonMetric::CubicInch),
+		"in³" => Ok(NonMetric::CubicInch),
+		"inch^3" => Ok(NonMetric::CubicInch),
+		"inches^3" => Ok(NonMetric::CubicInch),
+		"in^3" => Ok(NonMetric::CubicInch),
+
 		_ => Err(ParseError::UnknownUnit(input)),
 	}
 }
@@ -365,6 +379,20 @@ mod test {
 		assert_eq!(parse_unit("miles^2".to_string()), Ok(NonMetric::SquareMile));
 		assert_eq!(parse_unit("mi^2".to_string()), Ok(NonMetric::SquareMile));
 
+		// Volume
+		assert_eq!(parse_unit("cubic inch".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("cubic inches".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("cubic in".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("cu inch".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("cu inches".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("cu in".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("inch³".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("inches³".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("in³".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("inch^3".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("inches^3".to_string()), Ok(NonMetric::CubicInch));
+		assert_eq!(parse_unit("in^3".to_string()), Ok(NonMetric::CubicInch));
+
 		// Unknown unit
 		assert_eq!(parse_unit("hutenosa".to_string()), Err(ParseError::UnknownUnit("hutenosa".to_string())));
 	}

src/units.rs

@@ -4,6 +4,7 @@ pub enum Metric {
 	Gram,
 	Celsius,
 	SquareMetre,
+	CubicMetre,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -24,6 +25,8 @@ pub enum NonMetric {
 	SquareFoot,
 	Acre,
 	SquareMile,
+	// Volume
+	CubicInch,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]