implement query_filter stuff.
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@ -1,93 +1,68 @@
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#![allow(unused_variables)]
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#![allow(dead_code)]
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use crate::model::*;
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mod query_filter;
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pub use self::query_filter::QueryFilterSyntaxError;
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use self::query_filter::*;
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pub struct Query {
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filters: Vec<QueryFilter>,
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}
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pub type QueryParserResult = Result<Query, QuerySyntaxError>;
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pub enum QuerySyntaxError {
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UnknownFilter,
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}
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impl Query {
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pub fn parse(input: &[String]) -> QueryParserResult {
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pub fn search(&self, input: &mut Iterator<Item = &Texture>) -> Vec<Texture> {
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let mut results: Vec<(u64, &Texture)> = Vec::new();
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// We use pseudo decimal fixed point numbers here.
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// 1.000_000 = 1_000_000;
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// This is done, since algorithms like quicksort can fail on floats.
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let required_score = self.required_score() * 1_000_000u64;
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for texture in input {
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let mut score = 0u64;
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for (pos, filter) in self.filters.iter().enumerate() {
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match filter.score(texture) {
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Score::RequiredMatch(true) => (),
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Score::RequiredMatch(false) => {
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// skip this texture
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continue;
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}
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Score::Match(true) => {
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score += 1_000_000u64 * (1 + (0.1 / f64::sqrt(pos as f64 + 1.0)) as u64);
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}
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Score::Match(false) => (),
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}
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}
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if score >= required_score {
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results.push((score, texture))
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}
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}
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results.sort_by_key(|(score, _)| *score);
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results
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.iter()
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.map(|(_, texture)| Texture::clone(texture))
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.collect::<Vec<Texture>>()
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}
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fn required_score(&self) -> u64 {
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let non_special = self.filters.iter().filter(|f| !f.is_special()).count() as u64;
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// ceil(non_special / 2)
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(non_special + 1) / 2
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}
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pub fn parse(input: &[String]) -> Result<Query, QueryFilterSyntaxError> {
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let mut result = Query { filters: vec![] };
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for fltr in input {
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let qryfltr = Self::parse_single(fltr)?;
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let qryfltr = fltr.parse::<QueryFilter>()?;
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result.filters.push(qryfltr);
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}
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Ok(result)
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}
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fn parse_single(input: &str) -> Result<QueryFilter, QuerySyntaxError> {
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unimplemented!()
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}
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}
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pub fn search(input: &[Texture], query: &Query) -> Vec<Texture> {
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unimplemented!()
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}
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enum QueryFilter {
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Not(Box<QueryFilter>),
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Tag(String),
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SpecialInName(String),
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SpecialBeforeDate(Date),
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SpecialAfterDate(Date),
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SpecialMinResolution(u64),
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}
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enum Score {
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RequiredMatch(bool),
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Match(bool),
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}
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use std::ops::Not;
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impl Not for Score {
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type Output = Score;
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fn not(self) -> Score {
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match self {
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Score::RequiredMatch(b) => Score::RequiredMatch(!b),
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Score::Match(b) => Score::Match(!b),
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}
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}
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}
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impl QueryFilter {
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pub fn score(&self, texture: &Texture) -> Score {
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use QueryFilter::*;
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match self {
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Not(inner) => inner.score(texture).not(),
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Tag(tag) => Score::Match(
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texture
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.tags
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.iter()
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.find(|tt| tt.to_lowercase() == tag.to_lowercase())
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.is_some(),
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),
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SpecialInName(name) => Score::RequiredMatch(
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//
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texture.name.contains(name),
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),
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SpecialBeforeDate(date) => Score::RequiredMatch(texture.added_on <= *date),
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SpecialAfterDate(date) => Score::RequiredMatch(texture.added_on > *date),
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SpecialMinResolution(required) => {
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let smaller_resolution = u64::min(texture.resolution.0, texture.resolution.1);
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Score::RequiredMatch(smaller_resolution >= *required)
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}
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}
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}
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}
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@ -0,0 +1,135 @@
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use crate::model::*;
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use std::str::FromStr;
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pub enum QueryFilter {
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Not(Box<QueryFilter>),
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Tag(String),
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SpecialInName(String),
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SpecialBeforeDate(Date),
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SpecialAfterDate(Date),
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SpecialMinResolution(u64),
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}
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pub enum Score {
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RequiredMatch(bool),
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Match(bool),
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}
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pub enum QueryFilterSyntaxError {
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UnknownSpecialFilter,
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ResolutionArgumentInvalid,
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DateArgumentInvalid,
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}
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use std::ops::Not;
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impl Not for Score {
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type Output = Score;
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fn not(self) -> Score {
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match self {
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Score::RequiredMatch(b) => Score::RequiredMatch(!b),
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Score::Match(b) => Score::Match(!b),
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}
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}
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}
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impl QueryFilter {
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pub fn is_special(&self) -> bool {
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use QueryFilter::*;
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match self {
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Not(inner) => inner.is_special(),
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Tag(_) => false,
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SpecialInName(_) => true,
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SpecialBeforeDate(_) => true,
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SpecialAfterDate(_) => true,
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SpecialMinResolution(_) => true,
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}
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}
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pub fn score(&self, texture: &Texture) -> Score {
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use QueryFilter::*;
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match self {
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Not(inner) => inner.score(texture).not(),
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Tag(tag) => Score::Match(
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texture
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.tags
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.iter()
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.find(|tt| tt.to_lowercase() == tag.to_lowercase())
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.is_some(),
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),
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SpecialInName(name) => Score::RequiredMatch(
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//
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texture.name.contains(name),
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),
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SpecialBeforeDate(date) => Score::RequiredMatch(texture.added_on <= *date),
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SpecialAfterDate(date) => Score::RequiredMatch(texture.added_on > *date),
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SpecialMinResolution(required) => {
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let smaller_resolution = u64::min(texture.resolution.0, texture.resolution.1);
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Score::RequiredMatch(smaller_resolution >= *required)
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}
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}
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}
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}
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impl FromStr for QueryFilter {
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type Err = QueryFilterSyntaxError;
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fn from_str(input: &str) -> Result<QueryFilter, QueryFilterSyntaxError> {
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const NEGATION_CHAR: char = '!';
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const SPLIT_CHAR: char = ':';
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if input.starts_with(NEGATION_CHAR) {
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// A Not.
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let inner = Self::from_str(&input[1..])?;
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return Ok(QueryFilter::Not(Box::new(inner)));
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} else if input.contains(SPLIT_CHAR) {
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// A Special Filter
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let mut parts = input.splitn(2, SPLIT_CHAR);
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let filter_name = parts.next().unwrap().to_lowercase();
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let filter_arg = parts.next().unwrap();
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match filter_name.as_str() {
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"n" | "name" => Ok(QueryFilter::SpecialInName(filter_name.to_string())),
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"r" | "res" | "resolution" => {
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let num: u64;
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if filter_arg.ends_with("k") {
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num = *&filter_arg[0..(filter_arg.len() - 1)]
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.parse::<u32>()
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.map(|n| (n as u64) * 1024)
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.map_err(|_e| QueryFilterSyntaxError::ResolutionArgumentInvalid)?;
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} else {
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num = filter_arg
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.parse()
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.map_err(|_e| QueryFilterSyntaxError::ResolutionArgumentInvalid)?;
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}
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Ok(QueryFilter::SpecialMinResolution(num))
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}
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"a" | "after" => {
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let date = Date::from_str(filter_arg)
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.ok_or(QueryFilterSyntaxError::DateArgumentInvalid)?;
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Ok(QueryFilter::SpecialAfterDate(date))
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}
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"b" | "bef" | "before" => {
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let date = Date::from_str(filter_arg)
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.ok_or(QueryFilterSyntaxError::DateArgumentInvalid)?;
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Ok(QueryFilter::SpecialBeforeDate(date))
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}
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_ => Err(QueryFilterSyntaxError::UnknownSpecialFilter),
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}
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} else {
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// A Tag
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Ok(QueryFilter::Tag(input.to_string()))
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}
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}
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}
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