pierrelf.com
web engine - experimental web browser
1//! JavaScript engine — lexer, parser, bytecode, register VM, GC, JIT (AArch64).
2
3use std::fmt;
4
5/// An error produced by the JavaScript engine.
6#[derive(Debug)]
7pub enum JsError {
8 /// The engine does not yet support this feature or syntax.
9 NotImplemented,
10 /// A parse/syntax error in the source.
11 SyntaxError(String),
12 /// A runtime error during execution.
13 RuntimeError(String),
14}
15
16impl fmt::Display for JsError {
17 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
18 match self {
19 JsError::NotImplemented => write!(f, "not implemented"),
20 JsError::SyntaxError(msg) => write!(f, "SyntaxError: {}", msg),
21 JsError::RuntimeError(msg) => write!(f, "RuntimeError: {}", msg),
22 }
23 }
24}
25
26/// Evaluate a JavaScript source string and return the completion value.
27///
28/// This is a stub that always returns `NotImplemented`. The real
29/// implementation will lex, parse, compile to bytecode, and execute.
30pub fn evaluate(_source: &str) -> Result<(), JsError> {
31 Err(JsError::NotImplemented)
32}