Struct ChartItem 

#[non_exhaustive]
pub struct ChartItem {
    pub level: String,
    pub md5: Option<String>,
    pub sha256: Option<String>,
    pub title: Option<String>,
    pub artist: Option<String>,
    pub url: Option<String>,
    pub url_diff: Option<String>,
    pub comment: Option<String>,
    pub extra: BTreeMap<String, Value>,
}

Chart data item.

Describes metadata and resource links for a single BMS file.

Only the most commonly used spec-defined fields (md5, sha256, level, title, artist, url, url_diff, comment) are exposed as first-class fields. Other spec-defined optional fields (such as name_diff, url_pack, name_pack, org_md5, mode, ipfs, ipfs_diff, lr2_bmsid, etc.) are not individually promoted — they are preserved via extra for forward compatibility. This keeps the struct lean while remaining fully compatible with all real-world tables.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

level: String

Difficulty level, e.g. “0”

Defaults to "0" when null or absent in JSON, per the BMS difficulty table spec.

md5: Option<String>

MD5 hash of the file

sha256: Option<String>

SHA256 hash of the file

title: Option<String>

Song title

artist: Option<String>

Artist name

url: Option<String>

File download URL

url_diff: Option<String>

Differential file download URL (optional)

comment: Option<String>

Comment text

extra: BTreeMap<String, Value>

Extra data (unrecognized fields)

Implementations

impl ChartItem

pub const fn empty() -> Self

Creates a zero-alloc empty ChartItem with an empty level string.

Unlike new and default, this constructor does not allocate — the level is an empty String (not "0"). Prefer new or default when you need the spec-mandated default level.

pub const fn new(level: String) -> Self

Creates a new ChartItem with the given level and all other fields set to defaults.

Trait Implementations

impl Clone for ChartItem

fn clone(&self) -> ChartItem

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChartItem

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChartItem

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ChartItem

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ChartItem

impl PartialEq for ChartItem

fn eq(&self, other: &ChartItem) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ChartItem

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ChartItem