[gnome-builder] source-location: add ide_source_location_hash()

[Christian Hergert <chergert src gnome org>]

commit 77685e56989a30596d5199c0a6ff0cccc44223e8
Author: Christian Hergert <chergert redhat com>
Date:   Sat Oct 15 23:06:41 2016 -0700

    source-location: add ide_source_location_hash()

 libide/diagnostics/ide-source-location.c |   10 ++++++++++
 libide/diagnostics/ide-source-location.h |    1 +
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/libide/diagnostics/ide-source-location.c b/libide/diagnostics/ide-source-location.c
index 2804b78..3780a76 100644
--- a/libide/diagnostics/ide-source-location.c
+++ b/libide/diagnostics/ide-source-location.c
@@ -205,9 +205,19 @@ ide_source_location_compare (const IdeSourceLocation *a,
       if (0 != (ret = ide_file_compare (a->file, b->file)))
         return ret;
     }
+  else if (a->file)
+    return -1;
+  else if (b->file)
+    return 1;
 
   if (0 != (ret = (gint)a->line - (gint)b->line))
     return ret;
 
   return (gint)a->line_offset - (gint)b->line_offset;
 }
+
+guint
+ide_source_location_hash (IdeSourceLocation *self)
+{
+  return ide_file_hash (self->file) ^ g_int_hash (&self->line) ^ g_int_hash (&self->line_offset);
+}
diff --git a/libide/diagnostics/ide-source-location.h b/libide/diagnostics/ide-source-location.h
index ab56e18..1dad31b 100644
--- a/libide/diagnostics/ide-source-location.h
+++ b/libide/diagnostics/ide-source-location.h
@@ -41,6 +41,7 @@ IdeFile           *ide_source_location_get_file        (IdeSourceLocation
 IdeUri            *ide_source_location_get_uri         (IdeSourceLocation       *self);
 gint               ide_source_location_compare         (const IdeSourceLocation *a,
                                                         const IdeSourceLocation *b);
+guint              ide_source_location_hash            (IdeSourceLocation       *self);
 
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (IdeSourceLocation, ide_source_location_unref)