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use std::cmp::Ordering::*;
use super::{TemplateNode, Value};
use Value::*;
/// Apply the plus operator to a value.
pub fn pos(value: Value) -> Value {
match value {
Int(v) => Int(v),
Float(v) => Float(v),
Length(v) => Length(v),
Angle(v) => Angle(v),
Relative(v) => Relative(v),
Linear(v) => Linear(v),
_ => Error,
}
}
/// Compute the negation of a value.
pub fn neg(value: Value) -> Value {
match value {
Int(v) => Int(-v),
Float(v) => Float(-v),
Length(v) => Length(-v),
Angle(v) => Angle(-v),
Relative(v) => Relative(-v),
Linear(v) => Linear(-v),
_ => Error,
}
}
/// Compute the sum of two values.
pub fn add(lhs: Value, rhs: Value) -> Value {
match (lhs, rhs) {
// Math.
(Int(a), Int(b)) => Int(a + b),
(Int(a), Float(b)) => Float(a as f64 + b),
(Float(a), Int(b)) => Float(a + b as f64),
(Float(a), Float(b)) => Float(a + b),
(Angle(a), Angle(b)) => Angle(a + b),
(Length(a), Length(b)) => Length(a + b),
(Length(a), Relative(b)) => Linear(a + b),
(Length(a), Linear(b)) => Linear(a + b),
(Relative(a), Length(b)) => Linear(a + b),
(Relative(a), Relative(b)) => Relative(a + b),
(Relative(a), Linear(b)) => Linear(a + b),
(Linear(a), Length(b)) => Linear(a + b),
(Linear(a), Relative(b)) => Linear(a + b),
(Linear(a), Linear(b)) => Linear(a + b),
// Collections.
(Str(a), Str(b)) => Str(a + &b),
(Array(a), Array(b)) => Array(concat(a, b)),
(Dict(a), Dict(b)) => Dict(concat(a, b)),
// Templates.
(Template(a), Template(b)) => Template(concat(a, b)),
(Template(a), None) => Template(a),
(None, Template(b)) => Template(b),
(Template(mut a), Str(b)) => Template({
a.push(TemplateNode::Str(b));
a
}),
(Str(a), Template(mut b)) => Template({
b.insert(0, TemplateNode::Str(a));
b
}),
_ => Error,
}
}
/// Compute the difference of two values.
pub fn sub(lhs: Value, rhs: Value) -> Value {
match (lhs, rhs) {
(Int(a), Int(b)) => Int(a - b),
(Int(a), Float(b)) => Float(a as f64 - b),
(Float(a), Int(b)) => Float(a - b as f64),
(Float(a), Float(b)) => Float(a - b),
(Angle(a), Angle(b)) => Angle(a - b),
(Length(a), Length(b)) => Length(a - b),
(Length(a), Relative(b)) => Linear(a - b),
(Length(a), Linear(b)) => Linear(a - b),
(Relative(a), Length(b)) => Linear(a - b),
(Relative(a), Relative(b)) => Relative(a - b),
(Relative(a), Linear(b)) => Linear(a - b),
(Linear(a), Length(b)) => Linear(a - b),
(Linear(a), Relative(b)) => Linear(a - b),
(Linear(a), Linear(b)) => Linear(a - b),
_ => Error,
}
}
/// Compute the product of two values.
pub fn mul(lhs: Value, rhs: Value) -> Value {
match (lhs, rhs) {
(Int(a), Int(b)) => Int(a * b),
(Int(a), Float(b)) => Float(a as f64 * b),
(Float(a), Int(b)) => Float(a * b as f64),
(Float(a), Float(b)) => Float(a * b),
(Length(a), Int(b)) => Length(a * b as f64),
(Length(a), Float(b)) => Length(a * b),
(Int(a), Length(b)) => Length(a as f64 * b),
(Float(a), Length(b)) => Length(a * b),
(Angle(a), Int(b)) => Angle(a * b as f64),
(Angle(a), Float(b)) => Angle(a * b),
(Int(a), Angle(b)) => Angle(a as f64 * b),
(Float(a), Angle(b)) => Angle(a * b),
(Relative(a), Int(b)) => Relative(a * b as f64),
(Relative(a), Float(b)) => Relative(a * b),
(Int(a), Relative(b)) => Relative(a as f64 * b),
(Float(a), Relative(b)) => Relative(a * b),
(Linear(a), Int(b)) => Linear(a * b as f64),
(Linear(a), Float(b)) => Linear(a * b),
(Int(a), Linear(b)) => Linear(a as f64 * b),
(Float(a), Linear(b)) => Linear(a * b),
_ => Error,
}
}
/// Compute the quotient of two values.
pub fn div(lhs: Value, rhs: Value) -> Value {
match (lhs, rhs) {
(Int(a), Int(b)) => Float(a as f64 / b as f64),
(Int(a), Float(b)) => Float(a as f64 / b),
(Float(a), Int(b)) => Float(a / b as f64),
(Float(a), Float(b)) => Float(a / b),
(Length(a), Int(b)) => Length(a / b as f64),
(Length(a), Float(b)) => Length(a / b),
(Length(a), Length(b)) => Float(a / b),
(Angle(a), Int(b)) => Angle(a / b as f64),
(Angle(a), Float(b)) => Angle(a / b),
(Angle(a), Angle(b)) => Float(a / b),
(Relative(a), Int(b)) => Relative(a / b as f64),
(Relative(a), Float(b)) => Relative(a / b),
(Relative(a), Relative(b)) => Float(a / b),
(Linear(a), Int(b)) => Linear(a / b as f64),
(Linear(a), Float(b)) => Linear(a / b),
_ => Error,
}
}
/// Compute the logical "not" of a value.
pub fn not(value: Value) -> Value {
match value {
Bool(b) => Bool(!b),
_ => Error,
}
}
/// Compute the logical "and" of two values.
pub fn and(lhs: Value, rhs: Value) -> Value {
match (lhs, rhs) {
(Bool(a), Bool(b)) => Bool(a && b),
_ => Error,
}
}
/// Compute the logical "or" of two values.
pub fn or(lhs: Value, rhs: Value) -> Value {
match (lhs, rhs) {
(Bool(a), Bool(b)) => Bool(a || b),
_ => Error,
}
}
/// Compute whether two values are equal.
pub fn eq(lhs: Value, rhs: Value) -> Value {
Bool(lhs.eq(&rhs))
}
/// Compute whether two values are equal.
pub fn neq(lhs: Value, rhs: Value) -> Value {
Bool(!lhs.eq(&rhs))
}
macro_rules! comparison {
($name:ident, $($pat:tt)*) => {
/// Compute how a value compares with another value.
pub fn $name(lhs: Value, rhs: Value) -> Value {
lhs.cmp(&rhs)
.map_or(Value::Error, |x| Value::Bool(matches!(x, $($pat)*)))
}
};
}
comparison!(lt, Less);
comparison!(leq, Less | Equal);
comparison!(gt, Greater);
comparison!(geq, Greater | Equal);
/// Concatenate two collections.
fn concat<T, A>(mut a: T, b: T) -> T
where
T: Extend<A> + IntoIterator<Item = A>,
{
a.extend(b);
a
}
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