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feat: add ++ concat operator and auto-invoke main

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BUG-004: Add ++ operator for string and list concatenation across all
backends (interpreter, C, JS) with type checking and formatting support.

BUG-001: Auto-invoke top-level `let main = fn () => ...` when main is
a zero-parameter function, instead of just printing the function value.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Brandon Lucas
2026-02-18 22:01:41 -05:00
parent bb0a288210
commit 61e1469845
9 changed files with 110 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/codegen/js_backend.rs
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@@ -954,12 +954,17 @@ impl JsBackend {
let r = self.emit_expr(right)?;
// Check for string concatenation
if matches!(op, BinaryOp::Add) {
if matches!(op, BinaryOp::Add | BinaryOp::Concat) {
if self.is_string_expr(left) || self.is_string_expr(right) {
return Ok(format!("({} + {})", l, r));
}
}
// ++ on lists: use .concat()
if matches!(op, BinaryOp::Concat) {
return Ok(format!("{}.concat({})", l, r));
}
let op_str = match op {
BinaryOp::Add => "+",
BinaryOp::Sub => "-",
@@ -974,6 +979,7 @@ impl JsBackend {
BinaryOp::Ge => ">=",
BinaryOp::And => "&&",
BinaryOp::Or => "||",
BinaryOp::Concat => unreachable!("handled above"),
BinaryOp::Pipe => {
// Pipe operator: x |> f becomes f(x)
return Ok(format!("{}({})", r, l));
@@ -2342,7 +2348,7 @@ impl JsBackend {
}
}
Expr::BinaryOp { op, left, right, .. } => {
matches!(op, BinaryOp::Add)
matches!(op, BinaryOp::Add | BinaryOp::Concat)
&& (self.is_string_expr(left) || self.is_string_expr(right))
}
_ => false,