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Define a base class for all AST nodes. (#947)

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Also implement code-generation to manage the resulting boilerplate.
This commit is contained in:
Geoff Romer
2021-11-16 11:54:47 -08:00
committed by GitHub
parent d854fb93cb
commit 7a5b8434c8
24 changed files with 965 additions and 543 deletions
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executable_semantics/syntax/parser.ypp
+5 -8
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@@ -131,9 +131,9 @@
%type <Nonnull<TuplePattern*>> maybe_empty_tuple_pattern
%type <ParenContents<Pattern>> paren_pattern_base
%type <ParenContents<Pattern>> paren_pattern_contents
%type <Nonnull<ChoiceDeclaration::Alternative*>> alternative
%type <std::vector<Nonnull<ChoiceDeclaration::Alternative*>>> alternative_list
%type <std::vector<Nonnull<ChoiceDeclaration::Alternative*>>> alternative_list_contents
%type <Nonnull<AlternativeSignature*>> alternative
%type <std::vector<Nonnull<AlternativeSignature*>>> alternative_list
%type <std::vector<Nonnull<AlternativeSignature*>>> alternative_list_contents
%type <BisonWrap<Match::Clause>> clause
%type <std::vector<Match::Clause>> clause_list
@@ -683,13 +683,10 @@ member_list:
;
alternative:
identifier tuple
{
$$ = arena->New<ChoiceDeclaration::Alternative>(context.source_loc(), $1,
$2);
}
{ $$ = arena->New<AlternativeSignature>(context.source_loc(), $1, $2); }
| identifier
{
$$ = arena->New<ChoiceDeclaration::Alternative>(
$$ = arena->New<AlternativeSignature>(
context.source_loc(), $1,
arena->New<TupleLiteral>(context.source_loc()));
}