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// Minimal AST to satisfy eval.rs (and leave room for a parser later)
use serde::{Deserialize, Serialize};
/// Visibility modifier for declarations
#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Default)]
pub enum Visibility {
/// Public - can be imported by other modules
Pub,
/// Private (default) - only accessible within the module
#[default]
Private,
}
/// Condition for conditional compilation
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum CfgCondition {
/// Platform check: cfg(windows), cfg(linux), cfg(macos)
Platform(String),
/// Feature check: cfg(feature = "name")
Feature(String),
/// Negation: cfg(not(condition))
Not(Box<CfgCondition>),
/// All conditions: cfg(all(a, b))
All(Vec<CfgCondition>),
/// Any condition: cfg(any(a, b))
Any(Vec<CfgCondition>),
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum Stmt {
Let {
name: String,
value: Expr,
/// `let mut` support
is_mut: bool,
/// Visibility: `pub let x = ...` makes x importable
#[serde(default)]
visibility: Visibility,
},
Expr(Expr),
/// Import statement: `import "path"` or `import { a, b } from "path"`
Import {
/// Items to import (empty means import all as module)
items: Vec<ImportItem>,
/// Module path or package name
source: String,
/// Optional alias for the module: `import "path" as name`
alias: Option<String>,
},
/// Export statement: `export { a, b }` or `export { a as x }`
/// Re-exports: `export { a, b } from "path"`
Export {
/// Items to export
items: Vec<ExportItem>,
/// Optional source for re-exports
from_source: Option<String>,
},
/// Conditional compilation: #[cfg(condition)] statement
Cfg {
/// The condition to check
condition: CfgCondition,
/// The statement to conditionally include
body: Box<Stmt>,
},
}
/// An item in an import statement
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ImportItem {
/// Original name in the module
pub name: String,
/// Optional alias: `import { foo as bar }`
pub alias: Option<String>,
}
/// An item in an export statement
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ExportItem {
/// Name to export (local name or re-exported name)
pub name: String,
/// Optional alias: `export { foo as bar }`
pub alias: Option<String>,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum Expr {
// literals
LitInt(i64),
LitFloat(f64),
LitStr(String),
LitBool(bool),
Null,
// variables
Ident(String),
// collections
Array(Vec<Expr>),
Record(Vec<(String, Expr)>),
// lambda
Lambda {
params: Vec<String>,
body: Box<Expr>,
},
/// Async lambda: async fn(x) => expr
AsyncLambda {
params: Vec<String>,
body: Box<Expr>,
},
/// Await expression: await expr
Await(Box<Expr>),
/// Try expression: try { expr } catch { handler }
TryCatch {
try_expr: Box<Expr>,
catch_var: Option<String>, // Optional error binding: catch e { ... }
catch_expr: Box<Expr>,
},
/// Throw expression: throw "error message" or throw expr
Throw(Box<Expr>),
// call
Call {
callee: Box<Expr>,
args: Vec<Expr>, // positional
named: Vec<(String, Expr)>, // named: key = expr
},
// pipeline: left | right (where right is typically a Call)
Pipe {
left: Box<Expr>,
right: Box<Expr>,
},
// operators
Binary {
left: Box<Expr>,
op: BinOp,
right: Box<Expr>,
},
Unary {
op: UnOp,
expr: Box<Expr>,
},
// member access: record.field
MemberAccess {
object: Box<Expr>,
field: String,
},
// pattern matching
Match {
scrutinee: Box<Expr>,
arms: Vec<MatchArm>,
},
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct MatchArm {
pub pattern: Pattern,
pub guard: Option<Box<Expr>>, // optional `if condition`
pub body: Box<Expr>,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum Pattern {
// Wildcard: _
Wildcard,
// Variable binding: x
Ident(String),
// Literal patterns
LitInt(i64),
LitStr(String),
LitBool(bool),
Null,
// Constructor pattern: Some(x), None
Constructor { name: String, args: Vec<Pattern> },
// Array pattern: [a, b, c]
Array(Vec<Pattern>),
// Record pattern: {x, y} or {x: px, y: py}
Record(Vec<(String, Pattern)>),
}
#[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq)]
pub enum UnOp {
Neg,
Not,
}
#[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq)]
pub enum BinOp {
Add,
Sub,
Mul,
Div,
Rem,
Pow,
Eq,
Ne,
Lt,
Lte,
Gt,
Gte,
And,
Or,
}