pklr 4.0.0

Pure Rust pkl configuration language parser and evaluator
Documentation 
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#[derive(Debug, Clone, PartialEq)]
#[non_exhaustive]
pub enum StringPart {
    Literal(String),
    Tokens(Vec<Token>),
}

#[derive(Debug, Clone, PartialEq)]
#[non_exhaustive]
pub enum TokenKind {
    // Literals
    Ident(String),
    StringLit(String),
    /// Interpolated string: alternating literal parts and expression-token groups.
    /// Parts[0] is always a literal (possibly empty), Parts[1] is tokens for first \(...), etc.
    InterpolatedString(Vec<StringPart>),
    IntLit(i64),
    FloatLit(f64),
    BoolLit(bool),
    Null,

    // Punctuation
    LBrace,           // {
    RBrace,           // }
    LParen,           // (
    RParen,           // )
    LBracket,         // [
    RBracket,         // ]
    Comma,            // ,
    Semicolon,        // ;
    Dot,              // .
    DotDotDot,        // ...
    Equals,           // =
    Colon,            // :
    QuestionMark,     // ?
    QuestionQuestion, // ??
    QuestionDot,      // ?.
    Bang,             // !
    BangBang,         // !!
    Pipe,             // |
    PipeGt,           // |>
    Caret,            // ^
    At,               // @

    // Operators
    Plus,
    Minus,
    Star,
    Slash,
    Percent,
    EqEq,
    BangEq,
    Lt,
    Gt,
    LtEq,
    GtEq,
    TildeSlash, // ~/
    StarStar,   // **
    AmpAmp,
    PipePipe,
    Arrow,     // ->
    ThinArrow, // =>

    // Keywords
    KwAmends,
    KwImport,
    KwAs,
    KwLocal,
    KwConst,
    KwFixed,
    KwHidden,
    KwNew,
    KwExtends,
    KwAbstract,
    KwOpen,
    KwExternal,
    KwClass,
    KwTypeAlias,
    KwFunction,
    KwThis,
    KwSuper,
    KwModule,
    KwImportStar,
    KwIf,
    KwElse,
    KwWhen,
    KwIs,
    KwLet,
    KwThrow,
    KwTrace,
    KwRead,
    KwReadOrNull,
    KwFor,
    KwIn,

    // End of file
    Eof,
}

#[derive(Debug, Clone, PartialEq)]
pub struct Token {
    pub kind: TokenKind,
    pub line: usize,
    pub col: usize,
    /// Byte offset in the source string where this token starts.
    pub offset: usize,
}