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Add 3 '*' operators: one prefix, one infix, and one postfix, per #523. (#582)

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The presence or absence of whitespace is used to determine which
operator is in use, following the rules described in #520.

Support for prefix * dereference operator follows #523.

Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Richard Smith
2021-06-21 17:09:34 -07:00
committed by GitHub
co-authored by Geoff Romer
parent d6b47ba10f
commit 89e21113c3
12 changed files with 179 additions and 21 deletions
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executable_semantics/interpreter/interpreter.cpp
+8
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@@ -281,6 +281,9 @@ auto EvalPrim(Operator op, const std::vector<const Value*>& args, int line_num)
case Operator::Sub:
return Value::MakeIntVal(ValToInt(args[0], line_num) -
ValToInt(args[1], line_num));
case Operator::Mul:
return Value::MakeIntVal(ValToInt(args[0], line_num) *
ValToInt(args[1], line_num));
case Operator::Not:
return Value::MakeBoolVal(!ValToBool(args[0], line_num));
case Operator::And:
@@ -291,6 +294,11 @@ auto EvalPrim(Operator op, const std::vector<const Value*>& args, int line_num)
ValToBool(args[1], line_num));
case Operator::Eq:
return Value::MakeBoolVal(ValueEqual(args[0], args[1], line_num));
case Operator::Ptr:
return Value::MakePtrTypeVal(args[0]);
case Operator::Deref:
std::cerr << line_num << ": dereference not implemented yet\n";
exit(-1);
}
}