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Generic functions, first baby step (#658)

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* generic functions: progress on parser and AST

* finished first baby step

* revisions based on reviews

* Update executable_semantics/interpreter/interpreter.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Symbol => VariableType

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
This commit is contained in:
Jeremy G. Siek
2021-07-22 15:16:56 -04:00
committed by GitHub
co-authored by Jon Meow
parent cc56afb79e
commit 864b3bde02
27 changed files with 437 additions and 24 deletions
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executable_semantics/syntax/parser.ypp
+38 -8
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@@ -98,6 +98,9 @@ void yy::parser::error(const location_type&, const std::string& message) {
%type <const Carbon::Statement*> optional_else
%type <const Carbon::Statement*> statement_list
%type <const Carbon::Expression*> expression
%type <Carbon::GenericBinding> generic_binding
%type <std::vector<Carbon::GenericBinding>> deduced_params
%type <std::vector<Carbon::GenericBinding>> deduced_param_list
%type <const Carbon::Expression*> pattern
%type <const Carbon::Expression*> return_type
%type <const Carbon::Expression*> paren_expression
@@ -167,12 +170,13 @@ void yy::parser::error(const location_type&, const std::string& message) {
PERIOD "."
COMMA ","
SEMICOLON ";"
COLON_BANG ":!"
COLON ":"
;
%precedence FNARROW
%precedence "{" "}"
%precedence ":" "," DBLARROW
%precedence ":!" ":" "," DBLARROW
%left OR AND
%nonassoc EQUAL_EQUAL
%left "+" "-"
@@ -372,20 +376,46 @@ return_type:
| ARROW expression %prec FNARROW
{ $$ = $2; }
;
generic_binding:
identifier ":!" expression
{
$$ = Carbon::GenericBinding({.name = std::move($1), .type = $3});
}
;
deduced_param_list:
// Empty
{ $$ = std::vector<Carbon::GenericBinding>(); }
| generic_binding
{
$$ = std::vector<Carbon::GenericBinding>();
$$.push_back($1);
}
| generic_binding "," deduced_param_list
{
$$ = $3;
$$.push_back($1);
}
;
deduced_params:
// Empty
{ $$ = std::vector<Carbon::GenericBinding>(); }
| "[" deduced_param_list "]"
{ $$ = $2; }
;
function_definition:
FN identifier tuple return_type "{" statement_list "}"
{ $$ = Carbon::FunctionDefinition(yylineno, $2, $3, $4, $6); }
| FN identifier tuple DBLARROW expression ";"
FN identifier deduced_params tuple return_type "{" statement_list "}"
{ $$ = Carbon::FunctionDefinition(yylineno, $2, $3, $4, $5, $7); }
| FN identifier deduced_params tuple DBLARROW expression ";"
{
$$ = Carbon::FunctionDefinition(
yylineno, $2, $3,
yylineno, $2, $3, $4,
Carbon::Expression::MakeAutoTypeLiteral(yylineno),
Carbon::Statement::MakeReturn(yylineno, $5));
Carbon::Statement::MakeReturn(yylineno, $6));
}
;
function_declaration:
FN identifier tuple return_type ";"
{ $$ = Carbon::FunctionDefinition(yylineno, $2, $3, $4, 0); }
FN identifier deduced_params tuple return_type ";"
{ $$ = Carbon::FunctionDefinition(yylineno, $2, $3, $4, $5, 0); }
;
variable_declaration: identifier ":" expression
{ $$ = Carbon::Member::MakeFieldMember(yylineno, $1, $3); }