Add support for single line if-blocks

So now we can do:

if true
  print true
else
  print false

Instead having to do:

if true
{
  print true
}
else
{
  print false
}

1 files changed, 9 insertions, 2 deletions

diff --git a/build2/parser b/build2/parser
index 0962348..af5c500 100644
--- a/build2/parser
+++ b/build2/parser
@@ -56,8 +56,15 @@ namespace build2
     // Recursive descent parser.
     //
   protected:
-    void
-    clause (token&, token_type&);
+    // If one is true then parse a single (logical) line (logical means it
+    // can actually be several lines, e.g., an if-block). Return false if
+    // nothing has been parsed (i.e., we are on the same token).
+    //
+    // Note that after this function returns, the token is the first token on
+    // the next line (or eos).
+    //
+    bool
+    clause (token&, token_type&, bool one = false);
 
     void
     print (token&, token_type&);