From 4f63afc1177021d6345502892dbd028f5d6db5eb Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 16 Jul 2018 15:21:26 +0200
Subject: Implement in module

Given test.in containing something along these lines:

foo = $foo$

Now we can do:

using in

file{test}: in{test.in}
file{test}: foo = FOO

The alternative variable substitution symbol can be specified with the
in.symbol variable and lax (instead of the default strict) mode with
in.substitution. For example:

file{test}: in.symbol = '@'
file{test}: in.substitution = lax
---
 build2/in/rule.hxx | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 build2/in/rule.hxx

(limited to 'build2/in/rule.hxx')

diff --git a/build2/in/rule.hxx b/build2/in/rule.hxx
new file mode 100644
index 0000000..e588fd9f
--- /dev/null
+++ b/build2/in/rule.hxx
@@ -0,0 +1,50 @@
+// file      : build2/in/rule.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUILD2_IN_RULE_HXX
+#define BUILD2_IN_RULE_HXX
+
+#include <build2/types.hxx>
+#include <build2/utility.hxx>
+
+#include <build2/rule.hxx>
+
+namespace build2
+{
+  namespace in
+  {
+    // Preprocess an .in file.
+    //
+    class rule: public build2::rule
+    {
+    public:
+      rule () {}
+
+      virtual bool
+      match (action, target&, const string&) const override;
+
+      virtual recipe
+      apply (action, target&) const override;
+
+      // Perform variable lookup.
+      //
+      virtual string
+      lookup (const location&, const target&, const string& name) const;
+
+      // Perform variable substitution. Return nullopt if it should be
+      // ignored.
+      //
+      virtual optional<string>
+      substitute (const location&,
+                  const target&,
+                  const string& name,
+                  bool strict) const;
+
+      target_state
+      perform_update (action, const target&) const;
+    };
+  }
+}
+
+#endif // BUILD2_IN_RULE_HXX
-- 
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