From a94dcda7f00b10cb22b5f2138b1c29bcfbe7de37 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 24 Mar 2015 08:53:06 +0200
Subject: Make meta-operations control build loop; add disfigure skeleton

---
 build/operation | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

(limited to 'build/operation')

diff --git a/build/operation b/build/operation
index 3469f21..c759d59 100644
--- a/build/operation
+++ b/build/operation
@@ -7,13 +7,19 @@
 
 #include <string>
 #include <iosfwd>
+#include <vector>
 #include <cstdint>
 #include <functional> // reference_wrapper
 
+#include <build/path>
 #include <build/string-table>
 
 namespace build
 {
+  struct location;
+  class scope;
+  struct target_key;
+
   // While we are using uint8_t for the meta/operation ids, we assume
   // that each is limited to 4 bits (max 128 entries) so that we can
   // store the combined action id in uint8_t as well. This makes our
@@ -104,17 +110,76 @@ namespace build
   //
   enum class execution_mode {first, last};
 
-  // Meta/operation info.
+  // Meta-operation info.
+  //
+
+  // Normally a list of resolved and matched targets to execute. But
+  // can be something else, depending on the meta-operation.
   //
+  typedef std::vector<void*> action_targets;
+
   struct meta_operation_info
   {
     const std::string name;
+
+    void (*meta_operation_pre) (); // Start of meta-operation batch.
+    operation_id (*operation_pre) (operation_id); // Start of operation batch.
+
+    // Meta-operation-specific logic to load the buildfile, resolve and match
+    // the targets, and execute the action on the targets.
+    //
+    void (*load) (const path& buildfile,
+                  scope& root,
+                  const path& out_base,
+                  const path& src_base,
+                  const location&);
+
+    void (*match) (action,
+                   const target_key&,
+                   const location&,
+                   action_targets&);
+
+    void (*execute) (action, const action_targets&);
+
+    void (*operation_post) (operation_id); // End of operation batch.
+    void (*meta_operation_post) (); // End of meta-operation batch.
   };
 
   // Built-in meta-operations.
   //
+
+  // perform
+  //
+
+  // Load the buildfile. This is the default implementation that first
+  // calls root_pre(), then creates the scope for out_base, and, finally,
+  // loads the buildfile unless it has already been loaded for the root
+  // scope.
+  //
+  void
+  load (const path& buildfile,
+        scope& root,
+        const path& out_base,
+        const path& src_base,
+        const location&);
+
+  // Resolve and match the target. This is the default implementation
+  // that does just that and adds a pointer to the target to the list.
+  //
+  void
+  match (action, const target_key&, const location&, action_targets&);
+
+  // Execute the action on the list of targets. This is the default
+  // implementation that does just that while issuing appropriate
+  // diagnostics.
+  //
+  void
+  execute (action, const action_targets&);
+
   extern meta_operation_info perform;
 
+  // Operation info.
+  //
   struct operation_info
   {
     const std::string name;
-- 
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