From 6a242a8050edd0a33ea0e770a6eca4823a98b8d1 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 6 Jan 2022 06:59:31 +0200
Subject: Factor reusable code to target_key::effective_name()

---
 libbuild2/adhoc-rule-regex-pattern.cxx | 19 ++++-----------
 libbuild2/target-key.hxx               |  6 +++++
 libbuild2/target.ixx                   | 43 ++++++++++++++++++++++++++++++++++
 libbuild2/variable.cxx                 | 35 ++-------------------------
 4 files changed, 56 insertions(+), 47 deletions(-)

(limited to 'libbuild2')

diff --git a/libbuild2/adhoc-rule-regex-pattern.cxx b/libbuild2/adhoc-rule-regex-pattern.cxx
index 89a4766..b0de827 100644
--- a/libbuild2/adhoc-rule-regex-pattern.cxx
+++ b/libbuild2/adhoc-rule-regex-pattern.cxx
@@ -196,26 +196,17 @@ namespace build2
     //
     string& ns (me.buffer);
 
-    auto append_name = [&ns, first = true] (const target_key& tk,
-                                            const element& e) mutable
+    auto append_name = [&ns,
+                        first = true,
+                        storage = string ()] (const target_key& tk,
+                                              const element& e) mutable
     {
       if (!first)
         ns += '/';
       else
         first = false;
 
-      ns += *tk.name;
-
-      // The same semantics as in variable_type_map::find().
-      //
-      if (tk.ext && !tk.ext->empty () &&
-          (e.match_ext ||
-           tk.type->fixed_extension == &target_extension_none ||
-           tk.type->fixed_extension == &target_extension_must))
-      {
-        ns += '.';
-        ns += *tk.ext;
-      }
+      ns += tk.effective_name (storage, e.match_ext);
     };
 
     // Primary target (always a pattern).
diff --git a/libbuild2/target-key.hxx b/libbuild2/target-key.hxx
index cd1ba83..c5690a9 100644
--- a/libbuild2/target-key.hxx
+++ b/libbuild2/target-key.hxx
@@ -31,6 +31,12 @@ namespace build2
     bool is_a () const {return type->is_a<T> ();}
     bool is_a (const target_type& tt) const {return type->is_a (tt);}
 
+    // Return an "effective" name, for example, for pattern matching, that
+    // includes the extension where appropriate.
+    //
+    const string&
+    effective_name (string& storage, bool force_ext = false) const;
+
     // Append/return the target name or a pair of names if out-qualified.
     //
     // See also target::as_name() for the returned name stability guarantees.
diff --git a/libbuild2/target.ixx b/libbuild2/target.ixx
index 540c718..cfc3847 100644
--- a/libbuild2/target.ixx
+++ b/libbuild2/target.ixx
@@ -9,6 +9,49 @@
 
 namespace build2
 {
+  // target_key
+  //
+  inline const string& target_key::
+  effective_name (string& r, bool force_ext) const
+  {
+    const target_type& tt (*type);
+
+    // Note that if the name is not empty, then we always use that, even
+    // if the type is dir/fsdir.
+    //
+    if (name->empty () && (tt.is_a<build2::dir> () || tt.is_a<fsdir> ()))
+    {
+      r = dir->leaf ().string ();
+    }
+    // If we have the extension and the type expects the extension to be
+    // always specified explicitly by the user, then add it to the name.
+    //
+    // Overall, we have the following cases:
+    //
+    // 1. Extension is fixed: man1{}.
+    //
+    // 2. Extension is always specified by the user: file{}.
+    //
+    // 3. Default extension that may be overridden by the user: hxx{}.
+    //
+    // 4. Extension assigned by the rule but may be overridden by the
+    //    user: obje{}.
+    //
+    // By default we only include the extension for (2).
+    //
+    else if (ext && !ext->empty () &&
+             (force_ext ||
+              tt.fixed_extension == &target_extension_none ||
+              tt.fixed_extension == &target_extension_must))
+    {
+      r = *name + '.' + *ext;
+    }
+    else
+      return *name; // Use name as is.
+
+    return r;
+  }
+
   // match_extra
   //
   inline void match_extra::
diff --git a/libbuild2/variable.cxx b/libbuild2/variable.cxx
index 6f2812c..8ed9605 100644
--- a/libbuild2/variable.cxx
+++ b/libbuild2/variable.cxx
@@ -1857,39 +1857,8 @@ namespace build2
     {
       if (!oname)
       {
-        const target_type& tt (*tk.type);
-
-        // Note that if the name is not empty, then we always use that, even
-        // if the type is dir/fsdir.
-        //
-        if (tk.name->empty () && (tt.is_a<dir> () || tt.is_a<fsdir> ()))
-        {
-          oname = tk.dir->leaf ().string ();
-        }
-        // If we have the extension and the type expects the extension to be
-        // always specified explicitly by the user, then add it to the name.
-        //
-        // Overall, we have the following cases:
-        //
-        // 1. Extension is fixed: man1{}.
-        //
-        // 2. Extension is always specified by the user: file{}.
-        //
-        // 3. Default extension that may be overridden by the user: hxx{}.
-        //
-        // 4. Extension assigned by the rule but may be overridden by the
-        //    user: obje{}.
-        //
-        // By default we only match the extension for (2).
-        //
-        else if (tk.ext && !tk.ext->empty () &&
-                 (tt.fixed_extension == &target_extension_none ||
-                  tt.fixed_extension == &target_extension_must))
-        {
-          oname = *tk.name + '.' + *tk.ext;
-        }
-        else
-          oname = string (); // Use tk.name as is.
+        oname = string ();
+        tk.effective_name (*oname);
       }
 
       return oname->empty () ? *tk.name : *oname;
-- 
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