From fd1818e7cc30a928859a82e910f7c2825e585352 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 9 Dec 2021 13:10:10 +0300
Subject: Adjust types for future support of multiple requirements in an
 alternative

---
 libbpkg/manifest.cxx | 33 ++++++++++++++++++++++++++++-----
 libbpkg/manifest.hxx | 23 +++++++++++++++++++++--
 2 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/libbpkg/manifest.cxx b/libbpkg/manifest.cxx
index d605176..bbe8749 100644
--- a/libbpkg/manifest.cxx
+++ b/libbpkg/manifest.cxx
@@ -1188,6 +1188,21 @@ namespace bpkg
     return serializer::merge_comment (r, comment);
   }
 
+  // requirement_alternative
+  //
+  requirement_alternative::
+  requirement_alternative (const std::string& s)
+  {
+    push_back (s); // @@ DEP
+  }
+
+  string requirement_alternative::
+  string () const
+  {
+    assert (size () == 1); // @@ DEP
+    return front ();
+  }
+
   // requirement_alternatives
   //
   requirement_alternatives::
@@ -1220,7 +1235,7 @@ namespace bpkg
 
     list_parser lp (b, e, '|');
     for (string lv (lp.next ()); !lv.empty (); lv = lp.next ())
-      push_back (move (lv));
+      push_back (requirement_alternative (lv));
 
     if (empty () && comment.empty ())
       throw invalid_argument ("empty package requirement specification");
@@ -1229,10 +1244,18 @@ namespace bpkg
   std::string requirement_alternatives::
   string () const
   {
-    return (conditional
-            ? (buildtime ? "?* " : "? ")
-            : (buildtime ? "* " : "")) +
-           serializer::merge_comment (concatenate (*this, " | "), comment);
+    std::string r (conditional
+                   ? (buildtime ? "?* " : "? ")
+                   : (buildtime ? "* " : ""));
+
+    bool f (true);
+    for (const requirement_alternative& ra: *this)
+    {
+      r += (f ? (f = false, "") : " | ");
+      r += ra.string ();
+    }
+
+    return serializer::merge_comment (r, comment);
   }
 
   // build_class_term
diff --git a/libbpkg/manifest.hxx b/libbpkg/manifest.hxx
index ef44fcb..08f8a8e 100644
--- a/libbpkg/manifest.hxx
+++ b/libbpkg/manifest.hxx
@@ -504,7 +504,26 @@ namespace bpkg
 
   // requires
   //
-  class requirement_alternatives: public butl::small_vector<std::string, 1>
+  class requirement_alternative: public butl::small_vector<std::string, 1>
+  {
+  public:
+    butl::optional<std::string> enable;
+
+    requirement_alternative () = default;
+    requirement_alternative (butl::optional<std::string> e)
+        : enable (std::move (e)) {}
+
+    // Parse the requirement alternative string representation.
+    //
+    explicit LIBBPKG_EXPORT
+    requirement_alternative (const std::string&);
+
+    LIBBPKG_EXPORT std::string
+    string () const;
+  };
+
+  class requirement_alternatives:
+    public butl::small_vector<requirement_alternative, 1>
   {
   public:
     bool conditional;
@@ -517,7 +536,7 @@ namespace bpkg
 
     // Parse the requirement alternatives string representation in the
     // `[?] [<requirement> [ '|' <requirement>]*] [; <comment>]` form. Throw
-    // std::invalid_argument if the value is invalid.
+    // std::invalid_argument if the value is invalid. @@ DEP @@ TMP update.
     //
     explicit LIBBPKG_EXPORT
     requirement_alternatives (const std::string&);
-- 
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