rishi/scryer-prolog
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pass more numbers by reference

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This commit is contained in:
Mark Thom
2019-05-25 00:16:07 -04:00
parent 1baf772b1c
commit ea9cfa6d40
2 changed files with 29 additions and 24 deletions
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2
Cargo.toml
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@@ -1,6 +1,6 @@
[package]
name = "scryer-prolog"
version = "0.8.84"
version = "0.8.85"
authors = ["Mark Thom <markjordanthom@gmail.com>"]
repository = "https://github.com/mthom/scryer-prolog"
description = "A modern Prolog implementation written mostly in Rust."

51
src/prolog/arithmetic.rs
View File

@@ -309,7 +309,12 @@ pub fn result_f<Round>(n: &Number, round: Round) -> Result<f64, EvalError>
where Round: Fn(&Number) -> f64
{
let f = rnd_f(n);
classify_float(f, round)
}
fn classify_float<Round>(f: f64, round: Round) -> Result<f64, EvalError>
where Round: Fn(&Number) -> f64
{
match f.classify() {
FpCategory::Normal | FpCategory::Zero =>
Ok(round(&Number::Float(OrderedFloat(f)))),
@@ -324,30 +329,30 @@ pub fn result_f<Round>(n: &Number, round: Round) -> Result<f64, EvalError>
},
FpCategory::Nan => Err(EvalError::Undefined),
_ => Ok(round(&Number::Float(OrderedFloat(f))))
}
}
}
fn float_i_to_f(n: Integer) -> Result<f64, EvalError> {
result_f(&Number::Integer(n), rnd_f)
fn float_i_to_f(n: &Integer) -> Result<f64, EvalError> {
classify_float(n.to_f64(), rnd_f)
}
fn float_r_to_f(r: Rational) -> Result<f64, EvalError> {
result_f(&Number::Rational(r), rnd_f)
fn float_r_to_f(r: &Rational) -> Result<f64, EvalError> {
classify_float(r.to_f64(), rnd_f)
}
fn add_f(f1: f64, f2: f64) -> Result<OrderedFloat<f64>, EvalError> {
Ok(OrderedFloat(result_f(&Number::Float(OrderedFloat(f1 + f2)), rnd_f)?))
Ok(OrderedFloat(classify_float(f1 + f2, rnd_f)?))
}
fn mul_f(f1: f64, f2: f64) -> Result<OrderedFloat<f64>, EvalError> {
Ok(OrderedFloat(result_f(&Number::Float(OrderedFloat(f1 * f2)), rnd_f)?))
Ok(OrderedFloat(classify_float(f1 * f2, rnd_f)?))
}
fn div_f(f1: f64, f2: f64) -> Result<OrderedFloat<f64>, EvalError> {
if FpCategory::Zero == f2.classify() {
Err(EvalError::ZeroDivisor)
} else {
Ok(OrderedFloat(result_f(&Number::Float(OrderedFloat(f1 / f2)), rnd_f)?))
Ok(OrderedFloat(classify_float(f1 / f2, rnd_f)?))
}
}
@@ -360,13 +365,13 @@ impl Add<Number> for Number {
Ok(Number::Integer(n1 + n2)), // add_i
(Number::Integer(n1), Number::Float(OrderedFloat(n2)))
| (Number::Float(OrderedFloat(n2)), Number::Integer(n1)) =>
Ok(Number::Float(add_f(float_i_to_f(n1)?, n2)?)),
Ok(Number::Float(add_f(float_i_to_f(&n1)?, n2)?)),
(Number::Integer(n1), Number::Rational(n2))
| (Number::Rational(n2), Number::Integer(n1)) =>
Ok(Number::Rational(Rational::from(n1) + n2)),
(Number::Rational(n1), Number::Float(OrderedFloat(n2)))
| (Number::Float(OrderedFloat(n2)), Number::Rational(n1)) =>
Ok(Number::Float(add_f(float_r_to_f(n1)?, n2)?)),
Ok(Number::Float(add_f(float_r_to_f(&n1)?, n2)?)),
(Number::Float(OrderedFloat(f1)), Number::Float(OrderedFloat(f2))) =>
Ok(Number::Float(add_f(f1, f2)?)),
(Number::Rational(r1), Number::Rational(r2)) =>
@@ -403,14 +408,14 @@ impl Mul<Number> for Number {
(Number::Integer(n1), Number::Integer(n2)) =>
Ok(Number::Integer(n1 * n2)), // mul_i
(Number::Integer(n1), Number::Float(OrderedFloat(n2)))
| (Number::Float(OrderedFloat(n2)), Number::Integer(n1)) =>
Ok(Number::Float(mul_f(float_i_to_f(n1)?, n2)?)),
| (Number::Float(OrderedFloat(n2)), Number::Integer(n1)) =>
Ok(Number::Float(mul_f(float_i_to_f(&n1)?, n2)?)),
(Number::Integer(n1), Number::Rational(n2))
| (Number::Rational(n2), Number::Integer(n1)) =>
| (Number::Rational(n2), Number::Integer(n1)) =>
Ok(Number::Rational(Rational::from(n1) * n2)),
(Number::Rational(n1), Number::Float(OrderedFloat(n2)))
| (Number::Float(OrderedFloat(n2)), Number::Rational(n1)) =>
Ok(Number::Float(mul_f(float_r_to_f(n1)?, n2)?)),
| (Number::Float(OrderedFloat(n2)), Number::Rational(n1)) =>
Ok(Number::Float(mul_f(float_r_to_f(&n1)?, n2)?)),
(Number::Float(OrderedFloat(f1)), Number::Float(OrderedFloat(f2))) =>
Ok(Number::Float(mul_f(f1, f2)?)),
(Number::Rational(r1), Number::Rational(r2)) =>
@@ -425,23 +430,23 @@ impl Div<Number> for Number {
fn div(self, rhs: Number) -> Self::Output {
match (self, rhs) {
(Number::Integer(n1), Number::Integer(n2)) =>
Ok(Number::Float(div_f(float_i_to_f(n1)?, float_i_to_f(n2)?)?)),
Ok(Number::Float(div_f(float_i_to_f(&n1)?, float_i_to_f(&n2)?)?)),
(Number::Integer(n1), Number::Float(OrderedFloat(n2))) =>
Ok(Number::Float(div_f(float_i_to_f(n1)?, n2)?)),
Ok(Number::Float(div_f(float_i_to_f(&n1)?, n2)?)),
(Number::Float(OrderedFloat(n2)), Number::Integer(n1)) =>
Ok(Number::Float(div_f(n2, float_i_to_f(n1)?)?)),
Ok(Number::Float(div_f(n2, float_i_to_f(&n1)?)?)),
(Number::Integer(n1), Number::Rational(n2)) =>
Ok(Number::Float(div_f(float_i_to_f(n1)?, float_r_to_f(n2)?)?)),
Ok(Number::Float(div_f(float_i_to_f(&n1)?, float_r_to_f(&n2)?)?)),
(Number::Rational(n2), Number::Integer(n1)) =>
Ok(Number::Float(div_f(float_r_to_f(n2)?, float_i_to_f(n1)?)?)),
Ok(Number::Float(div_f(float_r_to_f(&n2)?, float_i_to_f(&n1)?)?)),
(Number::Rational(n1), Number::Float(OrderedFloat(n2))) =>
Ok(Number::Float(div_f(float_r_to_f(n1)?, n2)?)),
Ok(Number::Float(div_f(float_r_to_f(&n1)?, n2)?)),
(Number::Float(OrderedFloat(n2)), Number::Rational(n1)) =>
Ok(Number::Float(div_f(n2, float_r_to_f(n1)?)?)),
Ok(Number::Float(div_f(n2, float_r_to_f(&n1)?)?)),
(Number::Float(OrderedFloat(f1)), Number::Float(OrderedFloat(f2))) =>
Ok(Number::Float(div_f(f1, f2)?)),
(Number::Rational(r1), Number::Rational(r2)) =>
Ok(Number::Float(div_f(float_r_to_f(r1)?, float_r_to_f(r2)?)?))
Ok(Number::Float(div_f(float_r_to_f(&r1)?, float_r_to_f(&r2)?)?))
}
}
}