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implement Enum::Variant match patterns in parser and both codegens

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Parser now handles `SomeEnum::Variant` in match arm patterns, emitting
a Variant pattern node with enum_name and variant fields. Previously
these fell through to Binding, producing broken codegen.

JS codegen: emit str_eq check against the variant name string (El enums
are plain strings at runtime). C codegen: same, via EL_STR + str_eq.

Rebuild elc to pick up the parser change.
This commit is contained in:
Will Anderson
2026-05-04 10:35:35 -05:00
parent a54b2bebf9
commit 0f1da43a97
4 changed files with 26 additions and 4 deletions
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el-compiler/src/codegen.el
+9 -2
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@@ -848,8 +848,15 @@ fn cg_match(expr: Map<String, Any>) -> String {
}
let parts = native_list_append(parts, "if (" + subj_var + " == " + bv + ") { " + result_var + " = (" + body_c + "); goto " + done_label + "; } ")
} else {
// unknown pattern -> wildcard
let parts = native_list_append(parts, "{ " + result_var + " = (" + body_c + "); goto " + done_label + "; } ")
if str_eq(pkind, "Variant") {
// Enum::Variant pattern — match against the variant name
// string (El enums compile to plain strings).
let variant: String = pat["variant"]
let parts = native_list_append(parts, "if (str_eq(" + subj_var + ", EL_STR(" + c_str_lit(variant) + "))) { " + result_var + " = (" + body_c + "); goto " + done_label + "; } ")
} else {
// unknown pattern -> wildcard
let parts = native_list_append(parts, "{ " + result_var + " = (" + body_c + "); goto " + done_label + "; } ")
}
}
}
}