1 files changed, 101 insertions, 0 deletions
diff --git a/tests/build-class-expr/driver.cxx b/tests/build-class-expr/driver.cxx
new file mode 100644
index 0000000..343c3b5
--- /dev/null
+++ b/tests/build-class-expr/driver.cxx
@@ -0,0 +1,101 @@
+// file      : tests/build-class-expr/driver.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <ios>
+#include <string>
+#include <iostream>
+
+#include <libbutl/utility.mxx>  // eof(), operator<<(ostream, exception)
+#include <libbutl/optional.mxx>
+
+#include <libbpkg/manifest.hxx>
+
+// Usages:
+//
+// argv[0] -p
+// argv[0] [<classes>]
+//
+// Parse stdin lines as build configuration class expressions and print them
+// or evaluate.
+//
+// In the first form print expressions to stdout, one per line.
+//
+// In the second form sequentially match the configuration classes passed as
+// arguments against the expressions, updating the match result. If the first
+// expression has an underlying class set specified, then transform the
+// combined expression, making the underlying class set a starting set for the
+// original expression and a restricting set, simultaneously.
+//
+// On error print the exception description to stderr and exit with the two
+// status. Otherwise, if the combined expression doesn't match then exit with
+// the one status. Otherwise, exit with zero status.
+//
+int
+main (int argc, char* argv[])
+{
+  using namespace std;
+  using namespace butl;
+  using namespace bpkg;
+
+  using butl::optional;
+
+  bool print (argc != 1 && argv[1] == string ("-p"));
+
+  assert (!print || argc == 2);
+
+  cin.exceptions (ios::badbit);
+
+  strings cs;
+
+  if (print)
+    cout.exceptions (ios::failbit | ios::badbit);
+  else
+  {
+    for (int i (1); i != argc; ++i)
+      cs.push_back (argv[i]);
+  }
+
+  try
+  {
+    string s;
+    bool r (false);
+    optional<strings> underlying_cls;
+
+    while (!eof (getline (cin, s)))
+    {
+      build_class_expr expr (s, "" /* comment */);
+
+      if (print)
+        cout << expr << endl;
+      else
+      {
+        if (!underlying_cls)
+        {
+          underlying_cls = move (expr.underlying_classes);
+
+          if (!underlying_cls->empty ())
+          {
+            build_class_expr expr (*underlying_cls, '+', "" /* comment */);
+            expr.match (cs, r);
+          }
+        }
+
+        expr.match (cs, r);
+      }
+    }
+
+    if (underlying_cls && !underlying_cls->empty ())
+    {
+      build_class_expr expr (*underlying_cls, '&', "" /* comment */);
+      expr.match (cs, r);
+    }
+
+    return print || r ? 0 : 1;
+  }
+  catch (const exception& e)
+  {
+    cerr << e << endl;
+    return 2;
+  }
+}