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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/ast/expression.cpp
+11 -4
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@@ -105,7 +105,8 @@ auto Expression::MakeIdentifierExpression(int line_num, std::string var)
return v;
}
auto Expression::MakeBindingExpression(int line_num, std::string var,
auto Expression::MakeBindingExpression(int line_num,
std::optional<std::string> var,
const Expression* type)
-> const Expression* {
auto* v = new Expression();
@@ -280,11 +281,17 @@ void PrintExp(const Expression* e) {
case ExpressionKind::IdentifierExpression:
std::cout << e->GetIdentifierExpression().name;
break;
case ExpressionKind::BindingExpression:
PrintExp(e->GetBindingExpression().type);
case ExpressionKind::BindingExpression: {
const BindingExpression& binding = e->GetBindingExpression();
if (binding.name.has_value()) {
std::cout << *binding.name;
} else {
std::cout << "_";
}
std::cout << ": ";
std::cout << e->GetBindingExpression().name;
PrintExp(e->GetBindingExpression().type);
break;
}
case ExpressionKind::CallExpression:
PrintExp(e->GetCallExpression().function);
if (e->GetCallExpression().argument->tag() ==