From 5925c11a1fe8b2e02b790dd40b031ae005d5b68f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 10 Mar 2015 15:42:04 +0200
Subject: Further operation implementation

---
 build/operation | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 build/operation

(limited to 'build/operation')

diff --git a/build/operation b/build/operation
new file mode 100644
index 0000000..3398f32
--- /dev/null
+++ b/build/operation
@@ -0,0 +1,70 @@
+// file      : build/operation -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUILD_OPERATION
+#define BUILD_OPERATION
+
+#include <string>
+#include <cstdint>
+#include <iosfwd>
+
+#include <build/utility> // string_table
+
+namespace build
+{
+  // 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
+  // life easier when it comes to defining switch labels for action
+  // ids (no need to mess with endian-ness).
+  //
+  // Note that 0 is not a valid meta/operation/action id.
+  //
+  using meta_operation_id = std::uint8_t;
+  using operation_id = std::uint8_t;
+  using action_id = std::uint8_t;
+
+  struct action
+  {
+    action (meta_operation_id m, operation_id o): id ((m << 4) | o) {}
+
+    meta_operation_id
+    meta_operation () const {return id >> 4;}
+
+    operation_id
+    operation () const {return id & 0xF;}
+
+    // Implicit conversion operator to action_id for the switch()
+    // statement, etc.
+    //
+    operator action_id () const {return id;}
+
+    action_id id;
+  };
+
+  std::ostream&
+  operator<< (std::ostream&, action);
+
+  // Id constants for build-in operations.
+  //
+  const meta_operation_id perform_id   = 1;
+  const meta_operation_id configure_id = 2;
+  const meta_operation_id disfigure_id = 3;
+
+  const operation_id update_id = 1;
+  const operation_id clean_id  = 2;
+
+  const action_id perform_update_id = (perform_id << 4) | update_id;
+  const action_id perform_clean_id  = (perform_id << 4) | clean_id;
+
+  // Meta/operation id tables.
+  //
+  using meta_operation_table = string_table<meta_operation_id>;
+  using operation_table = string_table<operation_id>;
+
+  extern meta_operation_table meta_operations;
+  extern operation_table operations;
+}
+
+#endif // BUILD_OPERATION
-- 
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