From 183a0f3d21dce7e50ac001f626c6492c0d36e7a3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 19 Jul 2017 19:33:22 +0200
Subject: Add support for fail, warn, info, text directives

---
 build2/parser.cxx | 41 ++++++++++++++++++++++++++++++++++++++++-
 build2/parser.hxx |  3 +++
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/build2/parser.cxx b/build2/parser.cxx
index 96694c5..0c45e17 100644
--- a/build2/parser.cxx
+++ b/build2/parser.cxx
@@ -295,10 +295,17 @@ namespace build2
         {
           f = &parser::parse_assert;
         }
-        else if (n == "print")
+        else if (n == "print") // Unlike text goes to stdout.
         {
           f = &parser::parse_print;
         }
+        else if (n == "fail"  ||
+                 n == "warn"  ||
+                 n == "info"  ||
+                 n == "text")
+        {
+          f = &parser::parse_diag;
+        }
         else if (n == "source")
         {
           f = &parser::parse_source;
@@ -1529,6 +1536,38 @@ namespace build2
       next (t, tt); // Swallow newline.
   }
 
+  void parser::
+  parse_diag (token& t, type& tt)
+  {
+    diag_record dr;
+    const location l (get_location (t));
+
+    switch (t.value[0])
+    {
+    case 'f': dr << fail (l); break;
+    case 'w': dr << warn (l); break;
+    case 'i': dr << info (l); break;
+    case 't': dr << text (l); break;
+    default: assert (false);
+    }
+
+    // Parse the rest as a variable value to get expansion, attributes, etc.
+    //
+    value rhs (parse_variable_value (t, tt));
+
+    value lhs;
+    apply_value_attributes (nullptr, lhs, move (rhs), type::assign);
+
+    if (lhs)
+    {
+      names storage;
+      dr << reverse (lhs, storage);
+    }
+
+    if (tt != type::eos)
+      next (t, tt); // Swallow newline.
+  }
+
   string parser::
   parse_variable_name (names&& ns, const location& l)
   {
diff --git a/build2/parser.hxx b/build2/parser.hxx
index e7afe3a..2ee0a64 100644
--- a/build2/parser.hxx
+++ b/build2/parser.hxx
@@ -81,6 +81,9 @@ namespace build2
     parse_print (token&, token_type&);
 
     void
+    parse_diag (token&, token_type&);
+
+    void
     parse_source (token&, token_type&);
 
     void
-- 
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