Release name parser (#50)

crates/arr-parse/Cargo.toml

@@ -7,6 +7,7 @@ repository.workspace = true
 publish = false
 
 [dependencies]
+serde = { workspace = true }
 
 [lints]
 workspace = true

crates/arr-parse/src/lib.rs

@@ -1 +1,481 @@
-//! arr-parse — see DESIGN.md.
+//! Release name parsing.
+//!
+//! Everything extracted here is a *claim*, not a fact (`DESIGN.md` §5.6):
+//! release names lie or omit. Claims drive pre-grab filtering and scoring
+//! only. Post-download truth comes from `ffprobe` and lives in different
+//! types downstream — never mix the two in one struct.
+//!
+//! Parsing never fails: a malformed name yields a partial [`NameClaims`],
+//! worst case an empty one.
+
+mod markers;
+
+use serde::{Deserialize, Serialize};
+
+use crate::markers::{Marker, Strength};
+
+/// Claimed video resolution. Ordered worst to best.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Resolution {
+    /// 480p or 480i.
+    #[serde(rename = "480p")]
+    P480,
+    /// 576p or 576i.
+    #[serde(rename = "576p")]
+    P576,
+    /// 720p.
+    #[serde(rename = "720p")]
+    P720,
+    /// 1080p or 1080i.
+    #[serde(rename = "1080p")]
+    P1080,
+    /// 2160p, also claimed by `4K` and `UHD` markers.
+    #[serde(rename = "2160p")]
+    P2160,
+}
+
+/// Claimed source tier. Ordered worst to best per `DESIGN.md` §5.5; the
+/// bottom four are hard filters there, not low scores.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Source {
+    /// Camcorder in a cinema.
+    Cam,
+    /// Telesync.
+    Telesync,
+    /// Telecine.
+    Telecine,
+    /// Screener copy.
+    Screener,
+    /// DVD or a DVD rip.
+    Dvd,
+    /// Over-the-air capture.
+    Hdtv,
+    /// Re-encoded streaming capture.
+    WebRip,
+    /// Untouched streaming download.
+    WebDl,
+    /// `BluRay` encode.
+    BluRay,
+    /// Untouched `BluRay` streams.
+    Remux,
+}
+
+/// Claimed video codec.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub enum Codec {
+    /// H.264 / AVC.
+    X264,
+    /// H.265 / HEVC.
+    X265,
+    /// AV1.
+    Av1,
+    /// `XviD` / `DivX`.
+    Xvid,
+}
+
+/// Claimed HDR format markers. A name may carry several (`DV HDR10`), and a
+/// `DV` claim says nothing about the profile — that is `ffprobe`'s job
+/// (`DESIGN.md` §5.3).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub enum HdrMarker {
+    /// `DV`, `DoVi`, `Dolby Vision`.
+    DolbyVision,
+    /// HDR10+.
+    Hdr10Plus,
+    /// HDR10.
+    Hdr10,
+    /// Generic `HDR` with no format named.
+    Hdr,
+    /// Hybrid log-gamma.
+    Hlg,
+    /// Explicitly SDR.
+    Sdr,
+}
+
+/// Claimed language markers. `PtBr` and `Dual` are the first of the three
+/// pt-BR detection signals in `DESIGN.md` §5.2; interpretation belongs to
+/// the policy engine, this crate only reports what the name says.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub enum LanguageMarker {
+    /// `PT-BR`, `Dublado`, `Nacional`.
+    PtBr,
+    /// `PT-PT`.
+    PtPt,
+    /// `Portuguese`/`POR`/`PT` — flavour unknown.
+    Portuguese,
+    /// English.
+    English,
+    /// French.
+    French,
+    /// German.
+    German,
+    /// Spanish, including `Latino` and `Castellano`.
+    Spanish,
+    /// Italian.
+    Italian,
+    /// `MULTi` — several audio languages advertised.
+    Multi,
+    /// `DUAL` / `Dual Áudio` — two audio tracks, a common pt-BR signal.
+    Dual,
+}
+
+/// Claimed edition markers.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub enum Edition {
+    /// Extended cut or edition.
+    Extended,
+    /// Director's cut.
+    DirectorsCut,
+    /// Theatrical cut.
+    Theatrical,
+    /// Unrated.
+    Unrated,
+    /// Uncut.
+    Uncut,
+    /// IMAX.
+    Imax,
+    /// Remastered.
+    Remastered,
+    /// Criterion release.
+    Criterion,
+    /// Special edition.
+    SpecialEdition,
+    /// `LIMITED` theatrical run.
+    Limited,
+}
+
+/// What a release name claims about itself. Every field is unverified
+/// (`DESIGN.md` §5.6); absence of a marker means nothing.
+#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(default)]
+pub struct NameClaims {
+    /// Title words before the year / first quality marker, if any survived.
+    pub title: Option<String>,
+    /// Claimed release year.
+    pub year: Option<u16>,
+    /// Claimed resolution.
+    pub resolution: Option<Resolution>,
+    /// Claimed source tier. `Remux` wins when both it and `BluRay` appear.
+    pub source: Option<Source>,
+    /// Claimed video codec.
+    pub codec: Option<Codec>,
+    /// Claimed HDR markers, in order of appearance, deduplicated.
+    pub hdr: Vec<HdrMarker>,
+    /// Claimed language markers, in order of appearance, deduplicated.
+    pub languages: Vec<LanguageMarker>,
+    /// Claimed editions, in order of appearance, deduplicated.
+    pub editions: Vec<Edition>,
+    /// Claimed release group.
+    pub group: Option<String>,
+}
+
+#[derive(Debug, Clone)]
+struct Token {
+    orig: String,
+    low: String,
+}
+
+/// Parse a release name into [`NameClaims`]. Never panics; unrecognised
+/// input degrades to partial or empty claims.
+#[must_use]
+pub fn parse(name: &str) -> NameClaims {
+    let trimmed = name.trim();
+    let stripped = strip_extension(trimmed);
+    let (cleaned, bracket_group) = take_trailing_bracket_group(stripped);
+    let mut toks = tokenize(&cleaned);
+    strip_site_prefix(&mut toks);
+
+    let has_strong = first_strong_index(&toks).is_some();
+    let dash_group = take_dash_group(&mut toks, has_strong);
+    let first_strong = first_strong_index(&toks);
+
+    let limit = first_strong.unwrap_or(toks.len());
+    let year_positions: Vec<usize> = toks
+        .iter()
+        .enumerate()
+        .skip(1)
+        .filter(|(_, t)| markers::year_of(&t.low).is_some())
+        .map(|(i, _)| i)
+        .collect();
+    let year_idx = year_positions
+        .iter()
+        .rev()
+        .find(|&&i| i < limit)
+        .or_else(|| year_positions.first())
+        .copied();
+    let boundary = year_idx.map_or(limit, |y| y.min(limit));
+
+    let mut claims = NameClaims {
+        year: year_idx
+            .and_then(|i| toks.get(i))
+            .and_then(|t| markers::year_of(&t.low)),
+        group: dash_group.or(bracket_group),
+        ..NameClaims::default()
+    };
+
+    let mut title_toks: Vec<Token> = toks.get(..boundary).unwrap_or_default().to_vec();
+    strip_title_editions(&mut title_toks, &mut claims.editions);
+    if !title_toks.is_empty() {
+        let words: Vec<&str> = title_toks.iter().map(|t| t.orig.as_str()).collect();
+        claims.title = Some(words.join(" "));
+    }
+
+    let mut sources: Vec<Source> = Vec::new();
+    let mut i = boundary;
+    while i < toks.len() {
+        if Some(i) == year_idx || markers::is_season_episode(&toks[i].low) {
+            i += 1;
+            continue;
+        }
+        if let Some(next) = toks.get(i + 1) {
+            if Some(i + 1) != year_idx {
+                if let Some((m, _)) = markers::classify_pair(&toks[i].low, &next.low) {
+                    apply_marker(&mut claims, &mut sources, m);
+                    i += 2;
+                    continue;
+                }
+            }
+        }
+        if let Some((m, _)) = markers::classify(&toks[i].low) {
+            apply_marker(&mut claims, &mut sources, m);
+        }
+        i += 1;
+    }
+
+    claims.source = if sources.contains(&Source::Remux) {
+        Some(Source::Remux)
+    } else {
+        sources.first().copied()
+    };
+    claims
+}
+
+fn apply_marker(claims: &mut NameClaims, sources: &mut Vec<Source>, m: Marker) {
+    match m {
+        Marker::Resolution(r) => {
+            if claims.resolution.is_none() {
+                claims.resolution = Some(r);
+            }
+        }
+        Marker::Source(s) => {
+            if !sources.contains(&s) {
+                sources.push(s);
+            }
+        }
+        Marker::Codec(c) => {
+            if claims.codec.is_none() {
+                claims.codec = Some(c);
+            }
+        }
+        Marker::Hdr(h) => {
+            if !claims.hdr.contains(&h) {
+                claims.hdr.push(h);
+            }
+        }
+        Marker::Language(l) => {
+            if !claims.languages.contains(&l) {
+                claims.languages.push(l);
+            }
+        }
+        Marker::Edition(e) => {
+            if !claims.editions.contains(&e) {
+                claims.editions.push(e);
+            }
+        }
+        Marker::Audio | Marker::Junk => {}
+    }
+}
+
+/// Pop edition markers off the tail of the title region ("Movie Extended
+/// 2024" carries an edition, not a longer title). Always leaves at least
+/// one title token.
+fn strip_title_editions(title_toks: &mut Vec<Token>, editions: &mut Vec<Edition>) {
+    loop {
+        let n = title_toks.len();
+        if n >= 3 {
+            if let (Some(a), Some(b)) = (title_toks.get(n - 2), title_toks.get(n - 1)) {
+                if let Some((Marker::Edition(e), _)) = markers::classify_pair(&a.low, &b.low) {
+                    if !editions.contains(&e) {
+                        editions.insert(0, e);
+                    }
+                    title_toks.truncate(n - 2);
+                    continue;
+                }
+            }
+        }
+        if n >= 2 {
+            if let Some(last) = title_toks.get(n - 1) {
+                if let Some((Marker::Edition(e), _)) = markers::classify(&last.low) {
+                    if !editions.contains(&e) {
+                        editions.insert(0, e);
+                    }
+                    title_toks.truncate(n - 1);
+                    continue;
+                }
+            }
+        }
+        break;
+    }
+}
+
+/// Index of the first token that unambiguously marks the end of the title:
+/// a strong marker, a strong pair, or a season/episode tag.
+fn first_strong_index(toks: &[Token]) -> Option<usize> {
+    for (i, tok) in toks.iter().enumerate() {
+        if markers::is_season_episode(&tok.low) {
+            return Some(i);
+        }
+        if let Some(next) = toks.get(i + 1) {
+            if let Some((_, Strength::Strong)) = markers::classify_pair(&tok.low, &next.low) {
+                return Some(i);
+            }
+        }
+        if let Some((_, Strength::Strong)) = markers::classify(&tok.low) {
+            return Some(i);
+        }
+    }
+    None
+}
+
+fn tokenize(s: &str) -> Vec<Token> {
+    s.split(|c: char| {
+        matches!(
+            c,
+            '.' | '_' | '[' | ']' | '(' | ')' | '{' | '}' | ',' | ';' | '!' | '?'
+        ) || c.is_whitespace()
+    })
+    .filter(|t| !t.is_empty())
+    .map(|t| Token {
+        orig: t.to_string(),
+        low: t.to_lowercase(),
+    })
+    .collect()
+}
+
+/// Drop a leading `www.<site>.<tld>` tag.
+fn strip_site_prefix(toks: &mut Vec<Token>) {
+    if toks.first().is_some_and(|t| t.low == "www") {
+        let tld = toks.iter().take(4).position(|t| {
+            matches!(
+                t.low.as_str(),
+                "com" | "net" | "org" | "to" | "io" | "me" | "cc"
+            )
+        });
+        if let Some(i) = tld {
+            toks.drain(..=i);
+        }
+    }
+    while toks
+        .first()
+        .is_some_and(|t| !t.orig.is_empty() && t.orig.chars().all(|c| c == '-'))
+    {
+        toks.remove(0);
+    }
+}
+
+/// Group from a trailing dash: `x265-GROUP`, `TrueHD.7.1-FGT`, or the
+/// spaced form `... - GROUP`. Requires either a known marker left of the
+/// dash or a strong marker elsewhere, so `Spider-Man` alone keeps its dash.
+fn take_dash_group(toks: &mut Vec<Token>, has_strong: bool) -> Option<String> {
+    if toks.len() >= 2 && has_strong {
+        let sep = &toks[toks.len() - 2].orig;
+        let last = &toks[toks.len() - 1];
+        if !sep.is_empty() && sep.chars().all(|c| c == '-') && group_ok(&last.low) {
+            let g = last.orig.clone();
+            toks.truncate(toks.len() - 2);
+            return Some(g);
+        }
+    }
+    let last = toks.last()?;
+    if !last.orig.contains('-')
+        || markers::classify(&last.low).is_some()
+        || markers::is_season_episode(&last.low)
+    {
+        return None;
+    }
+    let (left, right) = last.orig.rsplit_once('-')?;
+    let left_low = left.to_lowercase();
+    let left_known = markers::classify(&left_low).is_some();
+    if !left.is_empty() && group_ok(&right.to_lowercase()) && (left_known || has_strong) {
+        let group = right.to_string();
+        let n = toks.len();
+        toks[n - 1] = Token {
+            orig: left.to_string(),
+            low: left_low,
+        };
+        return Some(group);
+    }
+    None
+}
+
+fn group_ok(low: &str) -> bool {
+    !low.is_empty()
+        && low.len() <= 24
+        && low.chars().any(|c| c.is_ascii_alphabetic())
+        && markers::classify(low).is_none()
+        && markers::year_of(low).is_none()
+        && !markers::is_season_episode(low)
+}
+
+/// Group from a trailing bracket tag, YTS style: `Movie (2024) [1080p]
+/// [YTS.MX]`. Bracketed chunks holding known markers are left in place for
+/// the token scan.
+fn take_trailing_bracket_group(s: &str) -> (String, Option<String>) {
+    const DENY: [&str; 4] = ["rartv", "eztv", "ettv", "tgx"];
+    let mut end = s.len();
+    loop {
+        let head = s[..end].trim_end_matches(|c: char| c.is_whitespace() || c == '.' || c == '-');
+        if !head.ends_with(']') {
+            break;
+        }
+        let Some(open) = head.rfind('[') else { break };
+        let content = &head[open + 1..head.len() - 1];
+        let low = content.to_lowercase();
+        let tokens_clean = low
+            .split(['.', '_', ' ', '-'])
+            .filter(|t| !t.is_empty())
+            .all(|t| {
+                markers::classify(t).is_none()
+                    && markers::year_of(t).is_none()
+                    && !markers::is_season_episode(t)
+            });
+        if !content.is_empty()
+            && !content.contains(' ')
+            && content.chars().any(|c| c.is_ascii_alphabetic())
+            && !DENY.contains(&low.as_str())
+            && tokens_clean
+        {
+            let mut out = String::with_capacity(s.len());
+            out.push_str(&s[..open]);
+            out.push_str(&s[head.len()..]);
+            return (out, Some(content.to_string()));
+        }
+        end = open;
+    }
+    (s.to_string(), None)
+}
+
+fn strip_extension(s: &str) -> &str {
+    if let Some((stem, ext)) = s.rsplit_once('.') {
+        let known = matches!(
+            ext.to_lowercase().as_str(),
+            "mkv"
+                | "mp4"
+                | "avi"
+                | "m4v"
+                | "mov"
+                | "wmv"
+                | "webm"
+                | "m2ts"
+                | "flv"
+                | "mpg"
+                | "mpeg"
+                | "iso"
+                | "divx"
+        );
+        if known && !stem.is_empty() {
+            return stem;
+        }
+    }
+    s
+}

crates/arr-parse/src/markers.rs

@@ -0,0 +1,204 @@
+//! Token classification tables. Input tokens are lowercase.
+
+use crate::{Codec, Edition, HdrMarker, LanguageMarker, Resolution, Source};
+
+/// What a recognised token claims. `Audio` and `Junk` are recognised so they
+/// anchor the title boundary and group detection, but are not surfaced.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum Marker {
+    Resolution(Resolution),
+    Source(Source),
+    Codec(Codec),
+    Hdr(HdrMarker),
+    Language(LanguageMarker),
+    Edition(Edition),
+    Audio,
+    Junk,
+}
+
+/// Strong markers set the title boundary. Weak markers are words that also
+/// occur in real titles ("Web", "Cam", "Dual") and only count once the
+/// boundary is already known.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum Strength {
+    Strong,
+    Weak,
+}
+
+pub(crate) fn classify(token: &str) -> Option<(Marker, Strength)> {
+    if let Some(m) = classify_exact(token) {
+        return Some(m);
+    }
+    if is_audio_family(token) {
+        return Some((Marker::Audio, Strength::Strong));
+    }
+    None
+}
+
+/// Two-token markers: `WEB DL`, `Dolby Vision`, `Dual Áudio`, `Directors Cut`.
+pub(crate) fn classify_pair(a: &str, b: &str) -> Option<(Marker, Strength)> {
+    let m = match (a, b) {
+        ("dolby", "vision") => (Marker::Hdr(HdrMarker::DolbyVision), Strength::Strong),
+        ("web", "dl") => (Marker::Source(Source::WebDl), Strength::Strong),
+        ("web", "rip") => (Marker::Source(Source::WebRip), Strength::Strong),
+        ("blu", "ray") => (Marker::Source(Source::BluRay), Strength::Strong),
+        ("dual", "audio" | "áudio") => (Marker::Language(LanguageMarker::Dual), Strength::Strong),
+        ("multi", "audio") => (Marker::Language(LanguageMarker::Multi), Strength::Strong),
+        ("h" | "x", "264") => (Marker::Codec(Codec::X264), Strength::Strong),
+        ("h" | "x", "265") => (Marker::Codec(Codec::X265), Strength::Strong),
+        ("directors" | "director's", "cut") => {
+            (Marker::Edition(Edition::DirectorsCut), Strength::Weak)
+        }
+        ("extended", "cut" | "edition") => (Marker::Edition(Edition::Extended), Strength::Weak),
+        ("special", "edition") => (Marker::Edition(Edition::SpecialEdition), Strength::Weak),
+        ("imax", "enhanced") => (Marker::Edition(Edition::Imax), Strength::Weak),
+        ("season", n) if !n.is_empty() && n.bytes().all(|c| c.is_ascii_digit()) => {
+            (Marker::Junk, Strength::Strong)
+        }
+        _ => return None,
+    };
+    Some(m)
+}
+
+#[allow(clippy::too_many_lines)]
+fn classify_exact(t: &str) -> Option<(Marker, Strength)> {
+    use Strength::{Strong, Weak};
+    let m = match t {
+        "2160p" | "4k" | "uhd" => (Marker::Resolution(Resolution::P2160), Strong),
+        "1080p" | "1080i" => (Marker::Resolution(Resolution::P1080), Strong),
+        "720p" => (Marker::Resolution(Resolution::P720), Strong),
+        "576p" | "576i" => (Marker::Resolution(Resolution::P576), Strong),
+        "480p" | "480i" => (Marker::Resolution(Resolution::P480), Strong),
+
+        "remux" | "bdremux" => (Marker::Source(Source::Remux), Strong),
+        "bluray" | "blu-ray" | "bdrip" | "brrip" => (Marker::Source(Source::BluRay), Strong),
+        "web-dl" | "webdl" => (Marker::Source(Source::WebDl), Strong),
+        "webrip" | "web-rip" => (Marker::Source(Source::WebRip), Strong),
+        "web" => (Marker::Source(Source::WebDl), Weak),
+        "hdtv" | "pdtv" => (Marker::Source(Source::Hdtv), Strong),
+        "dvdrip" | "dvd" => (Marker::Source(Source::Dvd), Strong),
+        "telesync" | "hdts" => (Marker::Source(Source::Telesync), Strong),
+        "ts" => (Marker::Source(Source::Telesync), Weak),
+        "telecine" | "hdtc" => (Marker::Source(Source::Telecine), Strong),
+        "tc" => (Marker::Source(Source::Telecine), Weak),
+        "screener" | "dvdscr" | "bdscr" => (Marker::Source(Source::Screener), Strong),
+        "scr" => (Marker::Source(Source::Screener), Weak),
+        "camrip" | "hdcam" => (Marker::Source(Source::Cam), Strong),
+        "cam" => (Marker::Source(Source::Cam), Weak),
+
+        "x264" | "h264" | "avc" => (Marker::Codec(Codec::X264), Strong),
+        "x265" | "h265" | "hevc" => (Marker::Codec(Codec::X265), Strong),
+        "av1" => (Marker::Codec(Codec::Av1), Strong),
+        "xvid" | "divx" => (Marker::Codec(Codec::Xvid), Strong),
+
+        "dovi" => (Marker::Hdr(HdrMarker::DolbyVision), Strong),
+        "dv" => (Marker::Hdr(HdrMarker::DolbyVision), Weak),
+        "hdr10+" | "hdr10plus" => (Marker::Hdr(HdrMarker::Hdr10Plus), Strong),
+        "hdr10" => (Marker::Hdr(HdrMarker::Hdr10), Strong),
+        "hdr" => (Marker::Hdr(HdrMarker::Hdr), Strong),
+        "hlg" => (Marker::Hdr(HdrMarker::Hlg), Strong),
+        "sdr" => (Marker::Hdr(HdrMarker::Sdr), Weak),
+
+        // pt-BR self-identification (`DESIGN.md` §5.2): loud and distinctive.
+        "pt-br" | "ptbr" | "dublado" | "nacional" => {
+            (Marker::Language(LanguageMarker::PtBr), Strong)
+        }
+        "pt-pt" | "ptpt" => (Marker::Language(LanguageMarker::PtPt), Strong),
+        "portuguese" | "português" | "portugues" => {
+            (Marker::Language(LanguageMarker::Portuguese), Strong)
+        }
+        "por" | "pt" => (Marker::Language(LanguageMarker::Portuguese), Weak),
+        "multi" => (Marker::Language(LanguageMarker::Multi), Strong),
+        "dual" => (Marker::Language(LanguageMarker::Dual), Weak),
+        "english" => (Marker::Language(LanguageMarker::English), Strong),
+        "eng" => (Marker::Language(LanguageMarker::English), Weak),
+        "french" | "truefrench" | "vostfr" => (Marker::Language(LanguageMarker::French), Strong),
+        "fre" | "fra" | "vf" | "vff" => (Marker::Language(LanguageMarker::French), Weak),
+        "german" | "deutsch" => (Marker::Language(LanguageMarker::German), Strong),
+        "ger" => (Marker::Language(LanguageMarker::German), Weak),
+        "spanish" | "castellano" | "latino" => (Marker::Language(LanguageMarker::Spanish), Strong),
+        "spa" | "esp" => (Marker::Language(LanguageMarker::Spanish), Weak),
+        "italian" | "italiano" => (Marker::Language(LanguageMarker::Italian), Strong),
+        "ita" => (Marker::Language(LanguageMarker::Italian), Weak),
+
+        "extended" => (Marker::Edition(Edition::Extended), Weak),
+        "unrated" => (Marker::Edition(Edition::Unrated), Weak),
+        "uncut" => (Marker::Edition(Edition::Uncut), Weak),
+        "theatrical" => (Marker::Edition(Edition::Theatrical), Weak),
+        "imax" => (Marker::Edition(Edition::Imax), Weak),
+        "remastered" => (Marker::Edition(Edition::Remastered), Weak),
+        "criterion" => (Marker::Edition(Edition::Criterion), Weak),
+        "limited" => (Marker::Edition(Edition::Limited), Weak),
+
+        "truehd" | "atmos" | "flac" | "opus" | "mp3" | "dd+" | "ma" => (Marker::Audio, Strong),
+
+        // "Legendado" claims pt-BR *subtitles* over original audio — it must
+        // NOT become a PtBr audio claim or main-root originals get rejected.
+        "proper" | "repack" | "internal" | "hybrid" | "10bit" | "8bit" | "hi10p" | "amzn"
+        | "dsnp" | "atvp" | "hmax" | "pcok" | "legendado" => (Marker::Junk, Strong),
+        "nf" | "hulu" | "max" | "itunes" | "cr" | "complete" | "sample" | "subbed" | "subs"
+        | "sub" | "mkv" | "mp4" | "avi" | "www" | "com" | "net" | "org" | "retail" | "readnfo" => {
+            (Marker::Junk, Weak)
+        }
+        _ => return None,
+    };
+    Some(m)
+}
+
+fn is_audio_family(t: &str) -> bool {
+    const PREFIXES: [&str; 9] = [
+        "ddp", "dd5", "dd7", "dd2", "dts", "eac3", "ac3", "aac", "truehd",
+    ];
+    PREFIXES.iter().any(|p| {
+        t.strip_prefix(p).is_some_and(|rest| {
+            matches!(rest, "-hd" | "hd" | "-x" | "x" | "-ma" | "ma" | "-hd-ma")
+                || rest
+                    .chars()
+                    .all(|c| c.is_ascii_digit() || matches!(c, '.' | '+' | '-'))
+        })
+    })
+}
+
+/// `S01`, `S01E02`, `S01E01E02`, `S01-E02`, `1x02`.
+pub(crate) fn is_season_episode(t: &str) -> bool {
+    fn digits(s: &str) -> (usize, &str) {
+        let n = s.bytes().take_while(u8::is_ascii_digit).count();
+        (n, &s[n..])
+    }
+    if let Some(rest) = t.strip_prefix('s') {
+        let (n, mut rest) = digits(rest);
+        if !(1..=2).contains(&n) {
+            return false;
+        }
+        while !rest.is_empty() {
+            let Some(r) = rest.strip_prefix('e').or_else(|| rest.strip_prefix("-e")) else {
+                return false;
+            };
+            let (m, r2) = digits(r);
+            if !(1..=3).contains(&m) {
+                return false;
+            }
+            rest = r2;
+        }
+        return true;
+    }
+    let (n, rest) = digits(t);
+    if (1..=2).contains(&n) {
+        if let Some(r) = rest.strip_prefix('x') {
+            let (m, r2) = digits(r);
+            return (2..=3).contains(&m) && r2.is_empty();
+        }
+    }
+    false
+}
+
+/// A plausible release year: four digits, 1900–2099.
+pub(crate) fn year_of(t: &str) -> Option<u16> {
+    if t.len() == 4 && t.bytes().all(|b| b.is_ascii_digit()) {
+        let y: u16 = t.parse().ok()?;
+        if (1900..=2099).contains(&y) {
+            return Some(y);
+        }
+    }
+    None
+}

crates/arr-parse/tests/parse.rs

@@ -0,0 +1,355 @@
+//! Table-driven checks over representative release names. The full fixture
+//! corpus pulled from real indexers is issue #9; these rows pin the parser's
+//! behaviour per shape of name.
+
+use arr_parse::{parse, Codec, Edition, HdrMarker, LanguageMarker, NameClaims, Resolution, Source};
+use serde as _;
+
+struct Case {
+    name: &'static str,
+    want: NameClaims,
+}
+
+#[allow(clippy::unnecessary_wraps)]
+fn s(v: &str) -> Option<String> {
+    Some(v.to_string())
+}
+
+#[allow(clippy::too_many_lines)]
+fn cases() -> Vec<Case> {
+    vec![
+        Case {
+            name: "Movie.Title.2024.2160p.UHD.BluRay.DV.HDR10.x265.TrueHD-GROUP",
+            want: NameClaims {
+                title: s("Movie Title"),
+                year: Some(2024),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::BluRay),
+                codec: Some(Codec::X265),
+                hdr: vec![HdrMarker::DolbyVision, HdrMarker::Hdr10],
+                group: s("GROUP"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // "Web" before the year is title, not a source claim.
+            name: "Charlottes.Web.2006.1080p.BluRay.x264-GRP",
+            want: NameClaims {
+                title: s("Charlottes Web"),
+                year: Some(2006),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::BluRay),
+                codec: Some(Codec::X264),
+                group: s("GRP"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Dune Part Two (2024) [2160p] [WEB-DL] [HDR10+] [YTS.MX]",
+            want: NameClaims {
+                title: s("Dune Part Two"),
+                year: Some(2024),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::WebDl),
+                hdr: vec![HdrMarker::Hdr10Plus],
+                group: s("YTS.MX"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "O.Auto.da.Compadecida.2000.NACIONAL.1080p.WEB-DL.x264-BRA",
+            want: NameClaims {
+                title: s("O Auto da Compadecida"),
+                year: Some(2000),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X264),
+                languages: vec![LanguageMarker::PtBr],
+                group: s("BRA"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Repeated pt-BR markers dedupe to one claim.
+            name: "Filme.2023.Dublado.PT-BR.1080p.WEBRip.x264",
+            want: NameClaims {
+                title: s("Filme"),
+                year: Some(2023),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::WebRip),
+                codec: Some(Codec::X264),
+                languages: vec![LanguageMarker::PtBr],
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Filme.Infantil.2023.1080p.WEB-DL.Dual.Áudio.x264",
+            want: NameClaims {
+                title: s("Filme Infantil"),
+                year: Some(2023),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X264),
+                languages: vec![LanguageMarker::Dual],
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Movie.2024.MULTi.1080p.WEB.x265-GRP",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X265),
+                languages: vec![LanguageMarker::Multi],
+                group: s("GRP"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Season/episode tags bound the title; no year needed.
+            name: "Serie.S01E02.720p.HDTV.x264-LOL",
+            want: NameClaims {
+                title: s("Serie"),
+                resolution: Some(Resolution::P720),
+                source: Some(Source::Hdtv),
+                codec: Some(Codec::X264),
+                group: s("LOL"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Remux beats the BluRay marker riding along.
+            name: "Movie.2024.2160p.BluRay.REMUX.HEVC.TrueHD.7.1.Atmos-FGT",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::Remux),
+                codec: Some(Codec::X265),
+                group: s("FGT"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Movie.2024.Extended.1080p.BluRay.x264",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::BluRay),
+                codec: Some(Codec::X264),
+                editions: vec![Edition::Extended],
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Edition between title and year is stripped off the title tail.
+            name: "Movie.Directors.Cut.2024.1080p.BluRay",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::BluRay),
+                editions: vec![Edition::DirectorsCut],
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // First year-like token is the title, second is the year.
+            name: "2012.2009.1080p.BluRay.x264",
+            want: NameClaims {
+                title: s("2012"),
+                year: Some(2009),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::BluRay),
+                codec: Some(Codec::X264),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Blade.Runner.2049.2017.2160p.WEB-DL.DDP5.1.HDR.HEVC-XEBEC",
+            want: NameClaims {
+                title: s("Blade Runner 2049"),
+                year: Some(2017),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X265),
+                hdr: vec![HdrMarker::Hdr],
+                group: s("XEBEC"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Movie.2024.HDTS.x264-ETRG",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                source: Some(Source::Telesync),
+                codec: Some(Codec::X264),
+                group: s("ETRG"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Movie.2024.1080p.HMAX.WEB-DL.DD5.1.H.264-GROUP",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X264),
+                group: s("GROUP"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Spaced dash before the group.
+            name: "Movie Title 2024 1080p BluRay x265 - VXT",
+            want: NameClaims {
+                title: s("Movie Title"),
+                year: Some(2024),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::BluRay),
+                codec: Some(Codec::X265),
+                group: s("VXT"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Filename with a container extension.
+            name: "Movie.Title.2024.720p.WEBRip.x264.mkv",
+            want: NameClaims {
+                title: s("Movie Title"),
+                year: Some(2024),
+                resolution: Some(Resolution::P720),
+                source: Some(Source::WebRip),
+                codec: Some(Codec::X264),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // No markers at all: the whole thing is a title claim.
+            name: "Some Random Words",
+            want: NameClaims {
+                title: s("Some Random Words"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Marker-only garbage parses partially, title absent.
+            name: "1080p",
+            want: NameClaims {
+                resolution: Some(Resolution::P1080),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "",
+            want: NameClaims::default(),
+        },
+        Case {
+            // Dolby Vision spelled out, dotted.
+            name: "Movie.2024.2160p.WEB-DL.Dolby.Vision.HDR10.HEVC-GRP",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X265),
+                hdr: vec![HdrMarker::DolbyVision, HdrMarker::Hdr10],
+                group: s("GRP"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Hyphenated title survives when nothing marks a group.
+            name: "Spider-Man.2002.1080p.BluRay.x264-SECTOR7",
+            want: NameClaims {
+                title: s("Spider-Man"),
+                year: Some(2002),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::BluRay),
+                codec: Some(Codec::X264),
+                group: s("SECTOR7"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "www.Torrenting.com - Movie.2024.1080p.WEB-DL.x264",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2024),
+                resolution: Some(Resolution::P1080),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X264),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            // Season pack, no episode.
+            name: "Show.Name.S02.2160p.WEB-DL.DDP5.1.DV.HDR10.H.265-NTb",
+            want: NameClaims {
+                title: s("Show Name"),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::WebDl),
+                codec: Some(Codec::X265),
+                hdr: vec![HdrMarker::DolbyVision, HdrMarker::Hdr10],
+                group: s("NTb"),
+                ..NameClaims::default()
+            },
+        },
+        Case {
+            name: "Movie.2019.4K.HDR.DV.2160p.BDRemux.Ita.Eng.x265-NAHOM",
+            want: NameClaims {
+                title: s("Movie"),
+                year: Some(2019),
+                resolution: Some(Resolution::P2160),
+                source: Some(Source::Remux),
+                codec: Some(Codec::X265),
+                hdr: vec![HdrMarker::Hdr, HdrMarker::DolbyVision],
+                languages: vec![LanguageMarker::Italian, LanguageMarker::English],
+                group: s("NAHOM"),
+                ..NameClaims::default()
+            },
+        },
+    ]
+}
+
+#[test]
+fn corpus_rows_parse_as_expected() {
+    let mut failures = Vec::new();
+    for Case { name, want } in cases() {
+        let got = parse(name);
+        if got != want {
+            failures.push(format!("{name:?}\n  got:  {got:?}\n  want: {want:?}"));
+        }
+    }
+    assert!(
+        failures.is_empty(),
+        "{} mismatches:\n{}",
+        failures.len(),
+        failures.join("\n")
+    );
+}
+
+#[test]
+fn garbage_never_panics() {
+    let inputs = [
+        "",
+        " ",
+        "....",
+        "----",
+        "[[[]]]",
+        "()()()",
+        "ção áéíóú 日本語 🎬🎬🎬",
+        "-.-.-.-[]()s01e999999999999999999999",
+        "Movie.2024.1080p-",
+        "a",
+        &"x.".repeat(5000),
+    ];
+    for input in inputs {
+        let _ = parse(input);
+    }
+}