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use std::cmp::Ordering;
use super::Value;
use crate::diag::StrResult;
use Value::*;
/// Bail with a type mismatch error.
macro_rules! mismatch {
($fmt:expr, $($value:expr),* $(,)?) => {
return Err(format!($fmt, $($value.type_name()),*))
};
}
/// Join a value with another value.
pub fn join(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(match (lhs, rhs) {
(a, None) => a,
(None, b) => b,
(Str(a), Str(b)) => Str(a + b),
(Array(a), Array(b)) => Array(a + b),
(Dict(a), Dict(b)) => Dict(a + b),
(Template(a), Template(b)) => Template(a + b),
(Template(a), Str(b)) => Template(a + b),
(Str(a), Template(b)) => Template(a + b),
(a, b) => mismatch!("cannot join {} with {}", a, b),
})
}
/// Apply the plus operator to a value.
pub fn pos(value: Value) -> StrResult<Value> {
Ok(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),
Fractional(v) => Fractional(v),
v => mismatch!("cannot apply '+' to {}", v),
})
}
/// Compute the negation of a value.
pub fn neg(value: Value) -> StrResult<Value> {
Ok(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),
Fractional(v) => Fractional(-v),
v => mismatch!("cannot apply '-' to {}", v),
})
}
/// Compute the sum of two values.
pub fn add(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(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),
(Fractional(a), Fractional(b)) => Fractional(a + b),
(Str(a), Str(b)) => Str(a + b),
(Array(a), Array(b)) => Array(a + b),
(Dict(a), Dict(b)) => Dict(a + b),
(Template(a), Template(b)) => Template(a + b),
(Template(a), Str(b)) => Template(a + b),
(Str(a), Template(b)) => Template(a + b),
(a, b) => mismatch!("cannot add {} and {}", a, b),
})
}
/// Compute the difference of two values.
pub fn sub(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(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),
(Fractional(a), Fractional(b)) => Fractional(a - b),
(a, b) => mismatch!("cannot subtract {1} from {0}", a, b),
})
}
/// Compute the product of two values.
pub fn mul(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(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),
(Float(a), Relative(b)) => Relative(a * b),
(Int(a), Relative(b)) => Relative(a as f64 * 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),
(Float(a), Fractional(b)) => Fractional(a * b),
(Fractional(a), Int(b)) => Fractional(a * b as f64),
(Fractional(a), Float(b)) => Fractional(a * b),
(Int(a), Fractional(b)) => Fractional(a as f64 * b),
(Str(a), Int(b)) => Str(a.repeat(b)?),
(Int(a), Str(b)) => Str(b.repeat(a)?),
(Array(a), Int(b)) => Array(a.repeat(b)?),
(Int(a), Array(b)) => Array(b.repeat(a)?),
(Template(a), Int(b)) => Template(a.repeat(b)?),
(Int(a), Template(b)) => Template(b.repeat(a)?),
(a, b) => mismatch!("cannot multiply {} with {}", a, b),
})
}
/// Compute the quotient of two values.
pub fn div(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(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),
(Fractional(a), Int(b)) => Fractional(a / b as f64),
(Fractional(a), Float(b)) => Fractional(a / b),
(Fractional(a), Fractional(b)) => Float(a / b),
(a, b) => mismatch!("cannot divide {} by {}", a, b),
})
}
/// Compute the logical "not" of a value.
pub fn not(value: Value) -> StrResult<Value> {
match value {
Bool(b) => Ok(Bool(!b)),
v => mismatch!("cannot apply 'not' to {}", v),
}
}
/// Compute the logical "and" of two values.
pub fn and(lhs: Value, rhs: Value) -> StrResult<Value> {
match (lhs, rhs) {
(Bool(a), Bool(b)) => Ok(Bool(a && b)),
(a, b) => mismatch!("cannot apply 'and' to {} and {}", a, b),
}
}
/// Compute the logical "or" of two values.
pub fn or(lhs: Value, rhs: Value) -> StrResult<Value> {
match (lhs, rhs) {
(Bool(a), Bool(b)) => Ok(Bool(a || b)),
(a, b) => mismatch!("cannot apply 'or' to {} and {}", a, b),
}
}
/// Compute whether two values are equal.
pub fn eq(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(Bool(equal(&lhs, &rhs)))
}
/// Compute whether two values are equal.
pub fn neq(lhs: Value, rhs: Value) -> StrResult<Value> {
Ok(Bool(!equal(&lhs, &rhs)))
}
macro_rules! comparison {
($name:ident, $op:tt, $($pat:tt)*) => {
/// Compute how a value compares with another value.
pub fn $name(lhs: Value, rhs: Value) -> StrResult<Value> {
if let Some(ordering) = compare(&lhs, &rhs) {
Ok(Bool(matches!(ordering, $($pat)*)))
} else {
mismatch!(concat!("cannot apply '", $op, "' to {} and {}"), lhs, rhs);
}
}
};
}
comparison!(lt, "<", Ordering::Less);
comparison!(leq, "<=", Ordering::Less | Ordering::Equal);
comparison!(gt, ">", Ordering::Greater);
comparison!(geq, ">=", Ordering::Greater | Ordering::Equal);
/// Compute the range from `lhs` to `rhs`.
pub fn range(lhs: Value, rhs: Value) -> StrResult<Value> {
match (lhs, rhs) {
(Int(a), Int(b)) => Ok(Array((a .. b).map(Int).collect())),
(a, b) => mismatch!("cannot apply '..' to {} and {}", a, b),
}
}
/// Determine whether two values are equal.
pub fn equal(lhs: &Value, rhs: &Value) -> bool {
match (lhs, rhs) {
// Compare reflexively.
(None, None) => true,
(Auto, Auto) => true,
(Bool(a), Bool(b)) => a == b,
(Int(a), Int(b)) => a == b,
(Float(a), Float(b)) => a == b,
(Length(a), Length(b)) => a == b,
(Angle(a), Angle(b)) => a == b,
(Relative(a), Relative(b)) => a == b,
(Linear(a), Linear(b)) => a == b,
(Fractional(a), Fractional(b)) => a == b,
(Color(a), Color(b)) => a == b,
(Str(a), Str(b)) => a == b,
(Array(a), Array(b)) => a == b,
(Dict(a), Dict(b)) => a == b,
(Template(a), Template(b)) => a == b,
(Func(a), Func(b)) => a == b,
(Dyn(a), Dyn(b)) => a == b,
// Some technically different things should compare equal.
(&Int(a), &Float(b)) => a as f64 == b,
(&Float(a), &Int(b)) => a == b as f64,
(&Length(a), &Linear(b)) => a == b.abs && b.rel.is_zero(),
(&Relative(a), &Linear(b)) => a == b.rel && b.abs.is_zero(),
(&Linear(a), &Length(b)) => a.abs == b && a.rel.is_zero(),
(&Linear(a), &Relative(b)) => a.rel == b && a.abs.is_zero(),
_ => false,
}
}
/// Compare two values.
pub fn compare(lhs: &Value, rhs: &Value) -> Option<Ordering> {
match (lhs, rhs) {
(Bool(a), Bool(b)) => a.partial_cmp(b),
(Int(a), Int(b)) => a.partial_cmp(b),
(Float(a), Float(b)) => a.partial_cmp(b),
(Angle(a), Angle(b)) => a.partial_cmp(b),
(Length(a), Length(b)) => a.partial_cmp(b),
(Relative(a), Relative(b)) => a.partial_cmp(b),
(Fractional(a), Fractional(b)) => a.partial_cmp(b),
(Str(a), Str(b)) => a.partial_cmp(b),
// Some technically different things should be comparable.
(&Int(a), &Float(b)) => (a as f64).partial_cmp(&b),
(&Float(a), &Int(b)) => a.partial_cmp(&(b as f64)),
(&Length(a), &Linear(b)) if b.rel.is_zero() => a.partial_cmp(&b.abs),
(&Relative(a), &Linear(b)) if b.abs.is_zero() => a.partial_cmp(&b.rel),
(&Linear(a), &Length(b)) if a.rel.is_zero() => a.abs.partial_cmp(&b),
(&Linear(a), &Relative(b)) if a.abs.is_zero() => a.rel.partial_cmp(&b),
_ => Option::None,
}
}
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