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use crate::cell::*;
use regex::Regex;
use std::collections::HashMap;
#[derive(Debug)]
pub struct ExpU {
target: String,
op: Op,
value: Cell,
}
impl ExpU {
pub fn new<T>(target: String, op: Op, val: T) -> Self
where
T: ToCell,
{
ExpU {
target: target,
op: op,
value: val.to_cell(),
}
}
pub fn target(&self) -> &String {
&self.target
}
pub fn eval(&self, against: &Cell) -> bool {
match &self.value {
Cell::Int(v) => {
if let Cell::Int(a) = against {
match self.op {
Op::Eq => v == a,
Op::Neq => v != a,
Op::Gt => a > v,
Op::Lt => a < v,
Op::GtEq => a >= v,
Op::LtEq => a <= v,
Op::Mod(i) => a % i == *v,
Op::Regex => false,
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
Cell::Uint(v) => {
if let Cell::Uint(a) = against {
match self.op {
Op::Eq => v == a,
Op::Neq => v != a,
Op::Gt => a > v,
Op::Lt => a < v,
Op::GtEq => a >= v,
Op::LtEq => a <= v,
Op::Mod(i) => *a as i64 % i == *v as i64,
Op::Regex => false,
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
Cell::Str(v) => {
if let Cell::Str(a) = against {
match self.op {
Op::Eq => v == a,
Op::Neq => v != a,
Op::Gt => a > v,
Op::Lt => a < v,
Op::GtEq => a >= v,
Op::LtEq => a <= v,
Op::Mod(_) => false,
Op::Regex => {
let re = match Regex::new(v) {
Ok(r) => r,
Err(_) => return true, // if not valid regex, do not filter
};
if let Some(_) = re.captures(a) {
true
} else {
false
}
}
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
Cell::Bool(v) => {
if let Cell::Bool(a) = against {
match self.op {
Op::Eq => v == a,
Op::Neq => v != a,
Op::Gt => !v && *a,
Op::Lt => !a && *v,
Op::GtEq => v == a || !v && *a,
Op::LtEq => v == a || !a && *v,
Op::Mod(_) => false,
Op::Regex => false,
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
Cell::Float(v) => {
if let Cell::Float(a) = against {
match self.op {
Op::Eq => v == a,
Op::Neq => v != a,
Op::Gt => a > v,
Op::Lt => a < v,
Op::GtEq => a >= v,
Op::LtEq => a <= v,
Op::Mod(i) => *a % i as f64 == *v,
Op::Regex => false,
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
Cell::DateTime(v) => {
if let Cell::DateTime(a) = against {
match self.op {
Op::Eq => v == a,
Op::Neq => v != a,
Op::Gt => a > v,
Op::Lt => a < v,
Op::GtEq => a >= v,
Op::LtEq => a <= v,
Op::Mod(_) => false,
Op::Regex => false,
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
Cell::Null(_) => {
if let Cell::Null(_) = against {
match self.op {
Op::Eq => true,
_ => false,
}
} else {
match self.op {
Op::Neq => true,
_ => false,
}
}
}
}
}
}
pub struct Or {
vexp: Vec<Exp>,
}
impl Or {
pub fn new(vexp: Vec<Exp>) -> Self {
Or { vexp }
}
}
pub struct And {
vexp: Vec<Exp>,
}
impl And {
pub fn new(vexp: Vec<Exp>) -> Self {
And { vexp }
}
}
pub enum Exp {
Or(Or),
And(And),
ExpU(ExpU),
Not(Box<Exp>),
}
pub fn and(vexp: Vec<Exp>) -> Exp {
Exp::And(And::new(vexp))
}
pub fn or(vexp: Vec<Exp>) -> Exp {
Exp::Or(Or::new(vexp))
}
pub fn exp<T: ToCell>(target: &str, op: Op, val: T) -> Exp {
Exp::ExpU(ExpU::new(target.to_string(), op, val))
}
pub fn not(exp: Exp) -> Exp {
Exp::Not(Box::new(exp))
}
impl Exp {
pub fn evaluate(&self, against: &HashMap<String, &Cell>) -> bool {
match self {
Self::ExpU(ex) => match against.get(&ex.target) {
Some(x) => ex.eval(x),
None => false,
},
Self::Or(ex) => match ex.vexp.iter().find(|e| e.evaluate(against)) {
Some(_) => true,
_ => false,
},
Self::And(ex) => ex.vexp.iter().all(|e| e.evaluate(against)),
Self::Not(ex) => !ex.evaluate(against),
}
}
}
#[derive(Debug)]
pub enum Op {
Eq,
Neq,
Gt,
Lt,
GtEq,
LtEq,
Regex,
Mod(i64),
}
pub fn eq() -> Op {
Op::Eq
}
pub fn neq() -> Op {
Op::Neq
}
pub fn gt() -> Op {
Op::Gt
}
pub fn lt() -> Op {
Op::Lt
}
pub fn gte() -> Op {
Op::GtEq
}
pub fn lte() -> Op {
Op::LtEq
}
pub fn modl(i: i64) -> Op {
Op::Mod(i)
}
pub fn regx() -> Op {
Op::Regex
}