refactor parsing to be testable
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parent
940a6061ee
commit
fd5436954a
65
src/main.rs
65
src/main.rs
@ -1,8 +1,11 @@
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#![feature(option_result_contains)]
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use nom::{
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branch::alt,
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bytes::{complete::take_while_m_n, streaming::take_while},
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combinator::{map_res, rest},
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bytes::{
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complete::{take_until1, take_while_m_n},
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streaming::take_while,
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},
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combinator::{complete, map_res, rest},
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sequence::tuple,
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IResult,
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};
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@ -14,6 +17,7 @@ use std::{
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};
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type CardFilter = Box<dyn Fn(&SearchCard) -> bool>;
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type RawCardFilter = (Field, Operator, Value);
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let cards = serde_json::from_reader::<_, CardInfo>(std::io::BufReader::new(std::fs::File::open("cards.json")?))?.data;
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@ -21,7 +25,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
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let cards_by_id: HashMap<_, _> = cards.into_iter().map(|c| (c.id, c)).collect();
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let mut query = Vec::new();
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for q in std::env::args().skip(1) {
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match query_arg(&q) {
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match parse_filter(&q) {
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Ok((_, filter)) => query.push(filter),
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Err(e) => Err(format!("Malformed query fragment {q}: {e:?}"))?,
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}
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@ -32,27 +36,43 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
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Ok(())
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}
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fn query_arg(input: &str) -> IResult<&str, CardFilter> {
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alt((map_res(tuple((field, operator, value)), |t| build_filter(t)), map_res(rest, |q: &str| fallback_filter(q))))(input)
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fn parse_filter(input: &str) -> IResult<&str, CardFilter> {
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map_res(parse_raw_filter, build_filter)(input)
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}
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fn fallback_filter(query: &str) -> Result<CardFilter, String> {
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fn parse_raw_filter(input: &str) -> IResult<&str, RawCardFilter> {
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alt((
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complete(tuple((field, operator, value))),
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map_res(take_until1(" "), |q| fallback_filter(q)),
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map_res(rest, |q| fallback_filter(q)),
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))(input)
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}
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fn fallback_filter(query: &str) -> Result<RawCardFilter, String> {
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if query.contains(&OPERATOR_CHARS[..]) {
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return Err(format!("Invalid query: {query}"));
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}
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println!("Trying to match {} as card name", query);
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dbg!("Trying to match {query} as card name");
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let q = query.to_lowercase();
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Ok(Box::new(move |card: &SearchCard| card.name.contains(&q)))
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Ok((Field::Name, Operator::Equals, Value::String(q)))
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}
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fn build_filter(query: (Field, Operator, Value)) -> Result<CardFilter, String> {
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fn build_filter(query: RawCardFilter) -> Result<CardFilter, String> {
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dbg!(&query);
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Ok(match query {
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(Field::Atk, op, Value::Numerical(n)) => Box::new(move |card| op.filter_number(card.atk, n)),
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(Field::Def, op, Value::Numerical(n)) => Box::new(move |card| op.filter_number(card.def, n)),
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// ? ATK/DEF is modeled as None in the source json. At least for some monsters.
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// Let’s at least find those.
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(Field::Atk, _, Value::String(s)) if s == "?" => Box::new(move |card| card.atk.is_none() && card.card_type.contains("monster")),
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(Field::Def, _, Value::String(s)) if s == "?" => {
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Box::new(move |card| card.def.is_none() && card.link_rating.is_none() && card.card_type.contains("monster"))
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}
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(Field::Level, op, Value::Numerical(n)) => Box::new(move |card| op.filter_number(card.level, n)),
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(Field::Type, Operator::Equals, Value::String(s)) => Box::new(move |card| card.r#type == s),
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(Field::Class, Operator::Equals, Value::String(s)) => Box::new(move |card| card.card_type.contains(&s)),
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(Field::Text, Operator::Equals, Value::String(s)) => Box::new(move |card| card.text.contains(&s)),
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(Field::Name, Operator::Equals, Value::String(s)) => Box::new(move |card| card.name.contains(&s)),
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q => Err(format!("unknown query: {q:?}"))?,
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})
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}
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@ -68,7 +88,7 @@ fn operator(input: &str) -> IResult<&str, Operator> {
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}
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fn value(input: &str) -> IResult<&str, Value> {
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map_res(rest, |i: &str| match i.parse() {
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map_res(alt((take_until1(" "), rest)), |i: &str| match i.parse() {
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Ok(n) => Ok(Value::Numerical(n)),
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Err(_) if i.is_empty() => Err("empty filter argument"),
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Err(_) => Ok(Value::String(i.to_lowercase())),
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@ -83,6 +103,8 @@ enum Field {
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Type,
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Attribute,
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Class,
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Name,
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Text,
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}
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impl FromStr for Field {
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@ -95,6 +117,7 @@ impl FromStr for Field {
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"type" | "t" => Self::Type,
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"attribute" | "attr" | "a" => Self::Attribute,
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"c" | "class" => Self::Class,
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"o" | "eff" | "text" | "effect" | "e" => Self::Text,
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_ => Err(s.to_string())?,
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})
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}
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@ -296,14 +319,28 @@ mod tests {
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)
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}
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#[test]
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fn query_parsing_test() {
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assert_eq!(parse_raw_filter("t:PYro"), Ok(("", (Field::Type, Operator::Equals, Value::String("pyro".into())))));
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assert_eq!(parse_raw_filter("t=pyro"), Ok(("", (Field::Type, Operator::Equals, Value::String("pyro".into())))));
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assert_eq!(parse_raw_filter("t==pyro"), Ok(("", (Field::Type, Operator::Equals, Value::String("pyro".into())))));
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assert_eq!(parse_raw_filter("atk>=100"), Ok(("", (Field::Atk, Operator::GreaterEqual, Value::Numerical(100)))));
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assert_eq!(parse_raw_filter("Necrovalley"), Ok(("", (Field::Name, Operator::Equals, Value::String("necrovalley".into())))));
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assert_eq!(parse_raw_filter("l=10"), Ok(("", (Field::Level, Operator::Equals, Value::Numerical(10)))));
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// These will fail during conversion
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assert!(parse_filter("l===10").is_err());
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assert!(parse_filter("t=").is_err());
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assert!(parse_filter("=100").is_err());
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assert!(parse_filter("atk<=>1").is_err());
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}
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#[test]
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fn level_filter_test() {
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let lacooda = SearchCard::from(&serde_json::from_str::<Card>(RAW_MONSTER).unwrap());
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let filter_level_3 = query_arg("l=3").unwrap().1;
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let filter_level_3 = parse_filter("l=3").unwrap().1;
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assert!(filter_level_3(&lacooda));
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let filter_level_5 = query_arg("l=5").unwrap().1;
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let filter_level_5 = parse_filter("l=5").unwrap().1;
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assert!(!filter_level_5(&lacooda));
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let filter_level_incorrect = query_arg("l===5").unwrap().1;
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assert!(!filter_level_incorrect(&lacooda));
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}
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}
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