diff --git a/doc/macroprocessor/macroprocessor.tex b/doc/macroprocessor/macroprocessor.tex
index 8f7c4d19f1178d9b1b2b54852eba7798358708c6..a3b56db75c647f8a31e4e6aaf6f9e62e764c0f50 100644
--- a/doc/macroprocessor/macroprocessor.tex
+++ b/doc/macroprocessor/macroprocessor.tex
@@ -215,6 +215,7 @@
\item comparison operators: \texttt{< > <= >= == !=}
\item concatenation: \texttt{+}
\item string length: \texttt{length()}
+ \item string emptiness: \texttt{isempty()}
\item extraction of substrings: if \texttt{s} is a string, then one can write \texttt{s[3]} or \texttt{s[4:6]}
\end{itemize}
\end{block}
@@ -227,7 +228,7 @@
\begin{block}{Operators on tuples}
\begin{itemize}
\item comparison operators: \texttt{== !=}
- \item functions: \texttt{length, empty}
+ \item functions: \texttt{length, isempty}
\item testing membership in tuple: \texttt{in} operator \\ (example:
\texttt{"b" in ("a", "b", "c")} returns \texttt{1})
\end{itemize}
@@ -243,7 +244,7 @@
\item comparison operators: \texttt{== !=}
\item dereferencing: if \texttt{v} is an array, then \texttt{v[2]} is its $2^{\textrm{nd}}$ element
\item concatenation: \texttt{+}
- \item functions: \texttt{sum, length, empty}
+ \item functions: \texttt{sum, length, isempty}
\item difference \texttt{-}: returns the first operand from which the elements of the second operand have been removed
\item Cartesian product of two arrays: \texttt{*}
\item Cartesian product of one array \texttt{N} times: \texttt{\^{}N}
diff --git a/src/macro/Expressions.cc b/src/macro/Expressions.cc
index ed1c6abd38b1d8c995be3c5b38008753d4cac012..23784ab77b637ad11533a9adf5093a9d0be1fda1 100644
--- a/src/macro/Expressions.cc
+++ b/src/macro/Expressions.cc
@@ -803,6 +803,8 @@ UnaryOp::eval()
return argbt->unary_plus();
case codes::UnaryOp::length:
return argbt->length();
+ case codes::UnaryOp::isempty:
+ return argbt->isempty();
case codes::UnaryOp::exp:
return argbt->exp();
case codes::UnaryOp::ln:
@@ -1133,6 +1135,8 @@ UnaryOp::to_string() const noexcept
return "+" + retval;
case codes::UnaryOp::length:
return "length(" + retval + ")";
+ case codes::UnaryOp::isempty:
+ return "isempty(" + retval + ")";
case codes::UnaryOp::exp:
return "exp(" + retval + ")";
case codes::UnaryOp::ln:
@@ -1352,6 +1356,9 @@ UnaryOp::print(ostream &output, bool matlab_output) const noexcept
case codes::UnaryOp::length:
output << "length(";
break;
+ case codes::UnaryOp::isempty:
+ output << "isempty(";
+ break;
case codes::UnaryOp::exp:
output << "exp(";
break;
diff --git a/src/macro/Expressions.hh b/src/macro/Expressions.hh
index 099f6920c3023e8378ac4c172861d567d085dfb6..9153e112bc394d582a486ab01aaa7b408dab8b50 100644
--- a/src/macro/Expressions.hh
+++ b/src/macro/Expressions.hh
@@ -148,6 +148,7 @@ namespace macro
virtual ArrayPtr set_intersection(const BaseTypePtr &btp) const { throw StackTrace("Operator & does not exist for this type"); }
virtual BoolPtr contains(const BaseTypePtr &btp) const { throw StackTrace("Second argument of `in` operator must be an array"); }
virtual RealPtr length() const { throw StackTrace("Operator `length` does not exist for this type"); }
+ virtual BoolPtr isempty() const { throw StackTrace("Operator `isempty` does not exist for this type"); }
virtual RealPtr max(const BaseTypePtr &btp) const { throw StackTrace("Operator `max` does not exist for this type"); }
virtual RealPtr min(const BaseTypePtr &btp) const { throw StackTrace("Operator `min` does not exist for this type"); }
virtual RealPtr mod(const BaseTypePtr &btp) const { throw StackTrace("Operator `mod` does not exist for this type"); }
@@ -337,6 +338,7 @@ namespace macro
BoolPtr is_greater_equal(const BaseTypePtr &btp) const override;
BoolPtr is_equal(const BaseTypePtr &btp) const override;
inline RealPtr length() const override { return make_shared<Real>(value.size(), env); }
+ inline BoolPtr isempty() const override { return make_shared<Bool>(value.empty(), env); }
BoolPtr cast_bool() const override;
RealPtr cast_real() const override;
inline StringPtr cast_string() const override { return make_shared<String>(value, env); }
@@ -373,6 +375,7 @@ namespace macro
BoolPtr is_equal(const BaseTypePtr &btp) const override;
BoolPtr contains(const BaseTypePtr &btp) const override;
inline RealPtr length() const override { return make_shared<Real>(tup.size(), env); }
+ inline BoolPtr isempty() const override { return make_shared<Bool>(empty(), env); }
BoolPtr cast_bool() const override;
RealPtr cast_real() const override;
inline StringPtr cast_string() const override { return make_shared<String>(this->to_string(), env); }
@@ -418,6 +421,7 @@ namespace macro
ArrayPtr set_intersection(const BaseTypePtr &btp) const override;
BoolPtr contains(const BaseTypePtr &btp) const override;
inline RealPtr length() const override { return make_shared<Real>(arr.size(), env); }
+ inline BoolPtr isempty() const override { return make_shared<Bool>(empty(), env); }
RealPtr sum() const override;
BoolPtr cast_bool() const override;
RealPtr cast_real() const override;
diff --git a/src/macro/ForwardDeclarationsAndEnums.hh b/src/macro/ForwardDeclarationsAndEnums.hh
index a606482c4ee248808c95b9d8119ab1c7dc3dbe84..35112c6ba28173addd221123db9ef13eb01380bd 100644
--- a/src/macro/ForwardDeclarationsAndEnums.hh
+++ b/src/macro/ForwardDeclarationsAndEnums.hh
@@ -76,6 +76,7 @@ namespace macro
unary_minus,
unary_plus,
length,
+ isempty,
exp,
ln,
log10,
diff --git a/src/macro/Parser.yy b/src/macro/Parser.yy
index cb51900f3c9702cd959bbc344404df70cf8fd23f..98e2b38fc398b7c5070b4ae5f7e3cc2968d1a65e 100644
--- a/src/macro/Parser.yy
+++ b/src/macro/Parser.yy
@@ -65,6 +65,8 @@ using namespace macro;
%token SQRT CBRT SIGN MAX MIN FLOOR CEIL TRUNC SUM MOD
%token ERF ERFC GAMMA LGAMMA ROUND NORMPDF NORMCDF LENGTH
+%token ISEMPTY
+
%token BOOL REAL STRING TUPLE ARRAY
%left OR
@@ -340,6 +342,8 @@ expr : LPAREN expr RPAREN
{ $$ = make_shared<UnaryOp>(codes::UnaryOp::unary_plus, $2, driver.env, @$); }
| LENGTH LPAREN expr RPAREN
{ $$ = make_shared<UnaryOp>(codes::UnaryOp::length, $3, driver.env, @$); }
+ | ISEMPTY LPAREN expr RPAREN
+ { $$ = make_shared<UnaryOp>(codes::UnaryOp::isempty, $3, driver.env, @$); }
| EXP LPAREN expr RPAREN
{ $$ = make_shared<UnaryOp>(codes::UnaryOp::exp, $3, driver.env, @$); }
| LOG LPAREN expr RPAREN
diff --git a/src/macro/Tokenizer.ll b/src/macro/Tokenizer.ll
index 756e8d9b997fa08db4a5489d88af8e5eb5f95f06..c661d4a1af248d698f197d5075a9219db5569fad 100644
--- a/src/macro/Tokenizer.ll
+++ b/src/macro/Tokenizer.ll
@@ -141,6 +141,7 @@ CONT \\\\{SPC}*
<expr,eval>length { return token::LENGTH; }
<expr,eval>normpdf { return token::NORMPDF; }
<expr,eval>normcdf { return token::NORMCDF; }
+<expr,eval>isempty { return token::ISEMPTY; }
<expr,eval>bool { return token::BOOL; }
<expr,eval>real { return token::REAL; }