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Code Issues Packages Projects Releases 10 Wiki Activity

Add support for _ placeholder. (#661)

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Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
This commit is contained in:
Geoff Romer
2021-07-19 10:33:06 -07:00
committed by GitHub
co-authored by Jon Meow
parent c3c89a77a4
commit def98d1182
15 changed files with 88 additions and 20 deletions
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executable_semantics/interpreter/value.cpp
+10 -3
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@@ -171,8 +171,8 @@ auto Value::MakeContinuationValue(std::vector<Frame*> stack) -> Value* {
return v;
}
auto Value::MakeBindingPlaceholderValue(std::string name, const Value* type)
-> const Value* {
auto Value::MakeBindingPlaceholderValue(std::optional<std::string> name,
const Value* type) -> const Value* {
auto* v = new Value();
v->value = BindingPlaceholderValue({.name = std::move(name), .type = type});
return v;
@@ -352,8 +352,15 @@ auto PrintValue(const Value* val, std::ostream& out) -> void {
break;
}
case ValKind::BindingPlaceholderValue: {
const BindingPlaceholderValue& placeholder =
val->GetBindingPlaceholderValue();
if (placeholder.name.has_value()) {
out << *placeholder.name;
} else {
out << "_";
}
out << ": ";
PrintValue(val->GetBindingPlaceholderValue().type, out);
out << ": " << val->GetBindingPlaceholderValue().name;
break;
}
case ValKind::AlternativeValue: {