cljrs-reader 0.1.21

use cljrs_types::span::Span;

/// A parsed Clojure form with its source location.
///
/// `PartialEq` ignores spans so test assertions can compare forms without
/// constructing exact span values.
#[derive(Debug, Clone)]
pub struct Form {
    pub kind: FormKind,
    pub span: Span,
}

impl Form {
    pub fn new(kind: FormKind, span: Span) -> Self {
        Self { kind, span }
    }
}

impl PartialEq for Form {
    fn eq(&self, other: &Self) -> bool {
        self.kind == other.kind
    }
}

/// The payload of a `Form` node.
#[derive(Debug, Clone, PartialEq)]
pub enum FormKind {
    // ── Atoms ─────────────────────────────────────────────────────────────────
    Nil,
    Bool(bool),
    Int(i64),
    BigInt(String),
    Float(f64), // NaN != NaN per IEEE 754 — acceptable for AST equality
    BigDecimal(String),
    Ratio(String),
    Char(char),
    Str(String),
    Regex(String),
    /// `##Inf` → `INFINITY`, `##-Inf` → `NEG_INFINITY`, `##NaN` → `NAN`
    Symbolic(f64),

    // ── Identifiers ───────────────────────────────────────────────────────────
    Symbol(String),
    Keyword(String),
    AutoKeyword(String),

    // ── Collections ───────────────────────────────────────────────────────────
    List(Vec<Form>),
    Vector(Vec<Form>),
    /// Flat key/value pairs; length is always even.
    Map(Vec<Form>),
    Set(Vec<Form>),

    // ── Wrapping reader macros ────────────────────────────────────────────────
    Quote(Box<Form>),
    SyntaxQuote(Box<Form>),
    Unquote(Box<Form>),
    UnquoteSplice(Box<Form>),
    Deref(Box<Form>),
    /// `#'symbol`
    Var(Box<Form>),
    /// `^meta-form annotated-form` — raw meta form kept as-is; evaluator
    /// expands shorthand (`:kw` → `{:kw true}`, `Sym` → `{:tag Sym}`).
    Meta(Box<Form>, Box<Form>),

    // ── Dispatch forms ────────────────────────────────────────────────────────
    /// `#(…)` anonymous function literal
    AnonFn(Vec<Form>),
    /// `#tag form` tagged literal
    TaggedLiteral(String, Box<Form>),

    // ── Reader conditionals ───────────────────────────────────────────────────
    /// All branches are kept; the evaluator filters by `:rust`.
    /// `clauses` is flat: `[keyword, form, keyword, form, …]`.
    ReaderCond {
        splicing: bool,
        clauses: Vec<Form>,
    },
}