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//! Defines Carlo language expressions.
use std::fmt;
use crate::{
Error,
UNITS,
};
#[derive(Clone, Copy, Debug)]
/// Defines binary operations in Carlo.
pub enum BinaryOperation {
Add,
Sub,
Mul,
Div,
}
impl BinaryOperation {
/// Simplifies this binary operation.
pub fn simplify(&self, left: &Expression, right: &Expression) -> Expression {
use Expression::*;
if let Float {
value: l_value,
kg: l_kg,
m: l_m,
s: l_s,
a: l_a,
k: l_k,
mol: l_mol,
} = left {
if let Float {
value: r_value,
kg: r_kg,
m: r_m,
s: r_s,
a: r_a,
k: r_k,
mol: r_mol,
} = right {
Float {
value: self.oper_value(l_value, r_value),
kg: self.oper_unit("kg", l_kg, r_kg),
m: self.oper_unit("m", l_m, r_m),
s: self.oper_unit("s", l_s, r_s),
a: self.oper_unit("A", l_a, r_a),
k: self.oper_unit("K", l_k, r_k),
mol: self.oper_unit("mol", l_mol, r_mol),
}
} else {
Expression::Null
}
} else {
Expression::Null
}
}
/// Operate on two numbers.
pub fn oper_value(&self, left: &f64, right: &f64) -> f64 {
use BinaryOperation::*;
match self {
Add => left + right,
Sub => left - right,
Mul => left * right,
Div => left / right,
}
}
/// Operate on two units.
pub fn oper_unit(&self, unit: &str, left: &f64, right: &f64) -> f64 {
use BinaryOperation::*;
match self {
Add | Sub => if left == right {
return *left
} else {
Error::UnmatchedUnits (unit, &left.to_string(), &right.to_string()).warn();
return 0.0;
},
Mul => left + right,
Div => left - right,
}
}
}
impl fmt::Display for BinaryOperation {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use BinaryOperation::*;
let s = match self {
Add => "+",
Sub => "-",
Mul => "*",
Div => "/",
};
write!(f, "{}", s)
}
}
#[derive(Clone, Debug)]
/// Enumerates the expression available to the Carlo parser.
pub enum Expression {
/// Assignment
Assignment {
left: String,
right: Box<Expression>,
},
/// Reassignment
Reassignment {
left: String,
right: Box<Expression>,
},
/// 64-bit dimensioned floating-point
Float {
value: f64,
kg: f64,
m: f64,
s: f64,
a: f64,
k: f64,
mol: f64,
},
/// Identifier
Identifier (String),
/// Binary operation
BinOp {
left: Box<Expression>,
oper: BinaryOperation,
right: Box<Expression>,
},
/// Null
Null,
}
fn format_unit(
mut value: f64,
mut kg: f64,
mut m: f64,
mut s: f64,
mut a: f64,
mut k: f64,
mut mol: f64,
) -> String {
let mut output = String::new();
// Iterate through units and add values
for (name, unit) in UNITS {
if (kg, m, s, a, k, mol) == (unit.1, unit.2, unit.3, unit.4, unit.5, unit.6) {
value /= unit.0;
output.push_str(&format!(" {}", name));
kg -= unit.1;
m -= unit.2;
s -= unit.3;
a -= unit.4;
k -= unit.5;
mol -= unit.6;
}
}
for (unit, pow) in [
("kg", kg),
("m", m),
("s", s),
("A", a),
("K", k),
("mol", mol),
] {
if pow == 1.0 {
output.push_str(&format!(" {}", unit));
} else if pow != 0.0 {
output.push_str(&format!(" {}^{}", unit, pow));
}
}
format!("{:.6e}{}", value, output)
}
impl fmt::Display for Expression {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use Expression::*;
let string = match self {
Assignment {
left,
right,
} => {
format!("{} = {}", left, right)
},
Reassignment {
left,
right,
} => {
format!("{} = {}", left, right)
},
Float {
value,
kg,
m,
s,
a,
k,
mol,
} => {
format_unit(*value, *kg, *m, *s, *a, *k, *mol)
},
Identifier (s) => {
format!("{}", s)
},
BinOp {
left,
oper,
right,
} => {
format!("{} {} {}", left, oper, right)
},
Null => "Null".to_string(),
};
write!(f, "{}", string)
}
}