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use crate::Tag;
use itertools::Itertools;
pub trait ToFilterExpr {
fn equals<T: ToString>(self, s: T) -> FilterExpr;
fn contains<T: ToString>(self, s: T) -> FilterExpr;
}
impl ToFilterExpr for Tag {
fn equals<T: ToString>(self, s: T) -> FilterExpr {
FilterExpr::Equals(self, s.to_string())
}
fn contains<T: ToString>(self, s: T) -> FilterExpr {
FilterExpr::Contains(self, s.to_string())
}
}
pub enum FilterExpr {
Equals(Tag, String),
Contains(Tag, String),
Not(Box<FilterExpr>),
}
impl FilterExpr {
pub fn to_query(&self) -> String {
match self {
FilterExpr::Equals(tag, s) => format!("({:?} == \"{}\")", tag, s),
FilterExpr::Contains(tag, s) => format!("({:?} contains \"{}\")", tag, s),
FilterExpr::Not(exp) => format!("!{}", exp.to_query()),
}
}
}
pub struct Filter {
exprs: Vec<FilterExpr>,
}
impl Filter {
pub fn new() -> Self {
Self { exprs: Vec::new() }
}
pub fn with(filter: FilterExpr) -> Self {
Self {
exprs: vec![filter],
}
}
pub fn and(mut self, other: FilterExpr) -> Filter {
self.exprs.push(other);
self
}
pub fn and_not(mut self, other: FilterExpr) -> Self {
self.exprs.push(FilterExpr::Not(Box::new(other)));
self
}
pub fn to_query(&self) -> Option<String> {
if self.exprs.is_empty() {
return None;
}
let joined = self
.exprs
.iter()
.map(|filter| filter.to_query())
.join(" AND ");
Some(format!("({})", escape(&joined)))
}
}
fn escape(s: &str) -> String {
s.replace('\\', "\\\\")
.replace('\"', "\\\"")
.replace('\'', "\\\'")
}