Merge branch 'main' into conditional

CHANGES.md

@@ -64,6 +64,8 @@
 - Bugfix in `qpp::adjoint(QCircuit)`
 - Added `cond_func_t` type alias in ["qpp/types.hpp"] for boolean predicates of
   the form `std::vector<idx> -> bool`
+- Added `qpp::read_from_string()` to ["qpp/qasm/qasm.hpp"] and an associated
+  pyqpp wrapper
 
 # Version 5.1 - 1 March 2024
 

include/qpp/qasm/qasm.hpp

@@ -37,6 +37,7 @@
 #include <list>
 #include <memory>
 #include <sstream>
+#include <string>
 #include <unordered_map>
 #include <utility>
 #include <vector>
@@ -776,6 +777,23 @@ inline QCircuit read(std::istream& stream) {
     return *qc;
 }
 
+/**
+ * \brief Reads an OpenQASM circuit from a string and returns its qpp::QCircuit
+ * representation
+ *
+ * \return qpp::QCircuit
+ */
+inline QCircuit read_from_string(std::string qasm_string) {
+    std::istringstream stream(qasm_string);
+    ast::ptr<ast::Program> program = parser::parse_stream(stream);
+
+    std::unique_ptr<QCircuit> qc(
+        new QCircuit(program->qubits(), program->bits()));
+    QCircuitBuilder builder(qc.get());
+    program->accept(builder);
+    return *qc;
+}
+
 /**
  * \brief Reads an OpenQASM circuit from a file and returns its qpp::QCircuit
  * representation

pyqpp/include/pyqpp/qasm/qasm_bind.hpp

@@ -36,6 +36,9 @@ inline void init_qasm_qasm(py::module_& m) {
     auto py_qasm = m.def_submodule("qasm");
     py_qasm.def("read_from_file", &qpp::qasm::read_from_file,
                 "Get QCircuit representation of OpenQASM circuit");
+
+    py_qasm.def("read_from_string", &qpp::qasm::read_from_string,
+                "Get QCircuit representation of OpenQASM circuit");
 }
 
 #endif /* PYQPP_QASM_QASM_BIND_HPP_ */

unit_tests/tests/qasm/qasm.cpp

@@ -163,3 +163,8 @@ TEST(qpp_qasm_read_from_file, SciNot) {
     // Check norm
     EXPECT_NEAR(1, norm(adjoint(psi) * phi), 1e-5);
 }
+
+TEST(qpp_qasm_read_from_string, BasicParsing) {
+    EXPECT_NO_THROW(qasm::read_from_string(
+        "OPENQASM 2.0;\ninclude \"qelib1.inc\";\n qreg q[10];"));
+}