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use super::*;
use serde_json;
use std;
#[derive(Clone, Copy, Debug, Default, Deserialize, PartialEq, PartialOrd, Serialize)]
pub struct Number {
pub value: f64,
}
impl std::fmt::Display for Number {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", self.value)
}
}
impl Eq for Number {}
impl BindingsValue for Number {}
impl ConstraintValue for Number {
fn float(f: f64) -> Self {
Number { value: f }
}
fn to_float(&self) -> Option<f64> {
Some(self.value)
}
}
impl Number {
pub fn new(f: f64) -> Self {
Number { value: f }
}
}
#[derive(Clone, Debug, Deserialize, PartialEq, Serialize)]
pub enum NumericalConstraint {
#[serde(rename="set")]
Set { variable: String, constant: f64 },
#[serde(rename="sum")]
Sum {
first: String,
second: String,
third: String,
},
#[serde(rename="mul")]
Mul {
first: String,
second: String,
third: String,
},
#[serde(rename=">")]
GreaterThan { left: String, right: String },
#[serde(rename="neq")]
NotEqual { left: String, right: String },
}
impl Eq for NumericalConstraint {}
impl PartialOrd for NumericalConstraint {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
match (self, other) {
(&NumericalConstraint::Set { ref variable, ref constant, .. },
&NumericalConstraint::Set { variable: ref variable2, constant: ref constant2, .. }) => {
match variable.partial_cmp(variable2) {
Some(std::cmp::Ordering::Equal) => constant.partial_cmp(constant2),
ordering => ordering,
}
}
(&NumericalConstraint::Sum { ref first, ref second, ref third, .. },
&NumericalConstraint::Sum { first: ref first2, second: ref second2, third: ref third2, .. }) => {
match first.partial_cmp(first2) {
Some(std::cmp::Ordering::Equal) => {
match second.partial_cmp(second2) {
Some(std::cmp::Ordering::Equal) => third.partial_cmp(third2),
ordering => ordering,
}
}
ordering => ordering,
}
}
(&NumericalConstraint::Mul { ref first, ref second, ref third, .. },
&NumericalConstraint::Mul { first: ref first2, second: ref second2, third: ref third2, .. }) => {
match first.partial_cmp(first2) {
Some(std::cmp::Ordering::Equal) => {
match second.partial_cmp(second2) {
Some(std::cmp::Ordering::Equal) => third.partial_cmp(third2),
ordering => ordering,
}
}
ordering => ordering,
}
}
(&NumericalConstraint::GreaterThan { ref left, ref right, .. },
&NumericalConstraint::GreaterThan { left: ref left2, right: ref right2, .. }) => {
match left.partial_cmp(left2) {
Some(std::cmp::Ordering::Equal) => right.partial_cmp(right2),
ordering => ordering,
}
}
(&NumericalConstraint::NotEqual { ref left, ref right, .. },
&NumericalConstraint::NotEqual { left: ref left2, right: ref right2, .. }) => {
match left.partial_cmp(left2) {
Some(std::cmp::Ordering::Equal) => right.partial_cmp(right2),
ordering => ordering,
}
}
(_, _) => None,
}
}
}
impl std::fmt::Display for NumericalConstraint {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", serde_json::to_string(&self).unwrap())
}
}
impl NumericalConstraint {
pub fn solve<T: ConstraintValue>(&self, bindings: &Bindings<T>) -> SolveResult<T> {
let apply_op =
|x: &T, y: &T, op: &Fn(f64, f64) -> f64| -> Option<T> { x.to_float().and_then(|x| y.to_float().and_then(|y| Some(T::float(op(x, y))))) };
macro_rules! apply_op_or_return {
($x: ident, $y: ident, $z: ident, $op: expr) => ({
if let Some(value) = apply_op($x, $y, &$op) {
($z, value)
} else {
return SolveResult::Conflict
}
})
}
let (key, value) = match *self {
NumericalConstraint::Set { ref variable, ref constant, .. } => {
match bindings.get_binding(variable) {
None => (variable, T::float(constant.clone())),
Some(ref value) if value.to_float() == Some(*constant) => (variable, value.clone()),
Some(_) => return SolveResult::Conflict,
}
}
NumericalConstraint::Sum { ref first, ref second, ref third, .. } => {
match (bindings.get_binding(first), bindings.get_binding(second), bindings.get_binding(third)) {
(Some(ref value), Some(ref value2), None) => apply_op_or_return!(value, value2, third, &Add::add),
(Some(ref value), None, Some(ref value3)) => apply_op_or_return!(value3, value, second, &Sub::sub),
(None, Some(ref value2), Some(ref value3)) => apply_op_or_return!(value3, value2, first, &Sub::sub),
(Some(ref value), Some(ref value2), Some(ref value3)) => {
if Some(value) == apply_op(value3, value2, &Sub::sub).as_ref() {
return SolveResult::Partial(bindings.clone());
} else {
return SolveResult::Conflict;
}
}
_ => return SolveResult::Partial(bindings.clone()),
}
}
NumericalConstraint::Mul { ref first, ref second, ref third, .. } => {
match (bindings.get_binding(first), bindings.get_binding(second), bindings.get_binding(third)) {
(Some(ref value), Some(ref value2), None) => apply_op_or_return!(value, value2, third, &Mul::mul),
(Some(ref value), None, Some(ref value3)) => apply_op_or_return!(value3, value, second, &Div::div),
(None, Some(ref value2), Some(ref value3)) => apply_op_or_return!(value3, value2, first, &Div::div),
(Some(ref value), Some(ref value2), Some(ref value3)) => {
if Some(value) == apply_op(value3, value2, &Div::div).as_ref() {
return SolveResult::Partial(bindings.clone());
} else {
return SolveResult::Conflict;
}
}
_ => return SolveResult::Partial(bindings.clone()),
}
}
NumericalConstraint::GreaterThan { ref left, ref right, .. } => {
match (bindings.get_binding(left), bindings.get_binding(right)) {
(Some(ref left_value), Some(ref right_value)) if left_value > right_value => return SolveResult::Success(bindings.clone()),
(Some(_), Some(_)) => return SolveResult::Conflict,
_ => return SolveResult::Partial(bindings.clone()),
}
}
NumericalConstraint::NotEqual { ref left, ref right, .. } => {
match (bindings.get_binding(left), bindings.get_binding(right)) {
(Some(ref left_value), Some(ref right_value)) if left_value != right_value => return SolveResult::Success(bindings.clone()),
(Some(_), Some(_)) => return SolveResult::Conflict,
_ => return SolveResult::Partial(bindings.clone()),
}
}
};
SolveResult::Success(bindings.set_binding(key, value))
}
pub fn rename_variables(&self, renamed_variables: &HashMap<String, String>) -> Self {
let lookup = |v: &String| -> String { renamed_variables.get(v).cloned().or_else(|| Some(v.clone())).unwrap() };
match *self {
NumericalConstraint::Set { ref variable, ref constant, .. } => {
NumericalConstraint::Set {
variable: lookup(variable),
constant: constant.clone(),
}
}
NumericalConstraint::Sum { ref first, ref second, ref third, .. } => {
NumericalConstraint::Sum {
first: lookup(first),
second: lookup(second),
third: lookup(third),
}
}
NumericalConstraint::Mul { ref first, ref second, ref third, .. } => {
NumericalConstraint::Mul {
first: lookup(first),
second: lookup(second),
third: lookup(third),
}
}
NumericalConstraint::GreaterThan { ref left, ref right, .. } => {
NumericalConstraint::GreaterThan {
left: lookup(left),
right: lookup(right),
}
}
NumericalConstraint::NotEqual { ref left, ref right, .. } => {
NumericalConstraint::GreaterThan {
left: lookup(left),
right: lookup(right),
}
}
}
}
pub fn variables(&self) -> Vec<String> {
match *self {
NumericalConstraint::Set { ref variable, .. } => vec![variable.clone()],
NumericalConstraint::Sum { ref first, ref second, ref third, .. } => vec![first.clone(), second.clone(), third.clone()],
NumericalConstraint::Mul { ref first, ref second, ref third, .. } => vec![first.clone(), second.clone(), third.clone()],
NumericalConstraint::GreaterThan { ref left, ref right, .. } => vec![left.clone(), right.clone()],
NumericalConstraint::NotEqual { ref left, ref right, .. } => vec![left.clone(), right.clone()],
}
}
}