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use std::str::FromStr;
use itertools::Itertools;
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum MetadataFilterComparator {
Equals,
NotEquals,
GreaterThan,
GreaterThanOrEquals,
LessThan,
LessThanOrEquals,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct MetadataFilter {
key: String,
value: String,
comparator: MetadataFilterComparator,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum SearchTerm {
Inexact(String),
Exact(String),
MetadataFilter(MetadataFilter),
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct SearchQuery {
pub items: Vec<SearchTerm>,
}
impl FromStr for SearchQuery {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let items = s
.split_ascii_whitespace() .filter_map(|term| match term {
term if term.contains('=') => {
if let Some((k, v)) = term.split_once('=') {
Some(SearchTerm::MetadataFilter(MetadataFilter {
key: k.to_string(),
value: v.to_string(),
comparator: MetadataFilterComparator::Equals,
}))
} else {
None
}
}
term if term.starts_with('"') && term.ends_with('"') && term.len() > 4 => {
Some(SearchTerm::Exact(term.trim_matches('"').to_string()))
}
term if term.len() > 2 => Some(SearchTerm::Inexact(term.to_string())),
_ => None,
})
.collect_vec();
Ok(SearchQuery { items })
}
}
#[cfg(test)]
mod tests {
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn it_parses_multiple_inexact_words() {
assert_eq!(
"this is a big test".parse::<SearchQuery>(),
Ok(SearchQuery {
items: vec![
SearchTerm::Inexact("this".to_string()),
SearchTerm::Inexact("big".to_string()),
SearchTerm::Inexact("test".to_string())
]
})
)
}
#[test]
fn it_parses_a_single_inexact_word() {
assert_eq!(
"foobar".parse::<SearchQuery>(),
Ok(SearchQuery {
items: vec![SearchTerm::Inexact("foobar".to_string())]
})
)
}
#[test]
fn it_parses_a_single_exact_word() {
assert_eq!(
"\"foobar\"".parse::<SearchQuery>(),
Ok(SearchQuery {
items: vec![SearchTerm::Exact("foobar".to_string())]
})
)
}
#[test]
fn it_parses_a_single_metadata_filter() {
assert_eq!(
"foo=bar".parse::<SearchQuery>(),
Ok(SearchQuery {
items: vec![SearchTerm::MetadataFilter(MetadataFilter {
key: "foo".to_string(),
value: "bar".to_string(),
comparator: MetadataFilterComparator::Equals
})]
})
)
}
#[test]
fn it_parses_an_empty_string() {
assert_eq!("".parse::<SearchQuery>(), Ok(SearchQuery { items: vec![] }))
}
}