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Code Issues Packages Projects Releases 10 Wiki Activity

Switch Statement to use inheritance+cast (#718)

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This commit is contained in:
Jon Meow
2021-08-10 13:10:05 -07:00
committed by GitHub
parent 9168375978
commit d5564280ab
5 changed files with 535 additions and 567 deletions
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executable_semantics/syntax/parser.ypp
+15 -15
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@@ -414,35 +414,35 @@ clause_list:
;
statement:
expression "=" expression ";"
{ $$ = Statement::MakeAssign(yylineno, $1, $3); }
{ $$ = global_arena->New<Assign>(yylineno, $1, $3); }
| VAR pattern "=" expression ";"
{ $$ = Statement::MakeVariableDefinition(yylineno, $2, $4); }
{ $$ = global_arena->New<VariableDefinition>(yylineno, $2, $4); }
| expression ";"
{ $$ = Statement::MakeExpressionStatement(yylineno, $1); }
{ $$ = global_arena->New<ExpressionStatement>(yylineno, $1); }
| if_statement
{ $$ = $1; }
| WHILE "(" expression ")" block
{ $$ = Statement::MakeWhile(yylineno, $3, $5); }
{ $$ = global_arena->New<While>(yylineno, $3, $5); }
| BREAK ";"
{ $$ = Statement::MakeBreak(yylineno); }
{ $$ = global_arena->New<Break>(yylineno); }
| CONTINUE ";"
{ $$ = Statement::MakeContinue(yylineno); }
{ $$ = global_arena->New<Continue>(yylineno); }
| RETURN return_expression ";"
{ $$ = Statement::MakeReturn(yylineno, $2.first, $2.second); }
{ $$ = global_arena->New<Return>(yylineno, $2.first, $2.second); }
| block
{ $$ = $1; }
| MATCH "(" expression ")" "{" clause_list "}"
{ $$ = Statement::MakeMatch(yylineno, $3, $6); }
{ $$ = global_arena->New<Match>(yylineno, $3, $6); }
| CONTINUATION identifier statement
{ $$ = Statement::MakeContinuation(yylineno, $2, $3); }
{ $$ = global_arena->New<Continuation>(yylineno, $2, $3); }
| RUN expression ";"
{ $$ = Statement::MakeRun(yylineno, $2); }
{ $$ = global_arena->New<Run>(yylineno, $2); }
| AWAIT ";"
{ $$ = Statement::MakeAwait(yylineno); }
{ $$ = global_arena->New<Await>(yylineno); }
;
if_statement:
IF "(" expression ")" block optional_else
{ $$ = Statement::MakeIf(yylineno, $3, $5, $6); }
{ $$ = global_arena->New<If>(yylineno, $3, $5, $6); }
;
optional_else:
// Empty
@@ -462,11 +462,11 @@ statement_list:
// Empty
{ $$ = 0; }
| statement statement_list
{ $$ = Statement::MakeSequence(yylineno, $1, $2); }
{ $$ = global_arena->New<Sequence>(yylineno, $1, $2); }
;
block:
"{" statement_list "}"
{ $$ = Statement::MakeBlock(yylineno, $2); }
{ $$ = global_arena->New<Block>(yylineno, $2); }
;
return_type:
// Empty
@@ -515,7 +515,7 @@ function_definition:
$$ = FunctionDefinition(
yylineno, $2, $3, $4,
global_arena->New<AutoPattern>(yylineno), true,
Statement::MakeReturn(yylineno, $6, true));
global_arena->New<Return>(yylineno, $6, true));
}
;
function_declaration: