json: Add `JsonParseError`.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>

diff --git a/lib/json/error.nit b/lib/json/error.nit
new file mode 100644 (file)
index 0000000..dab1689
--- /dev/null
+++ b/lib/json/error.nit
@@ -0,0 +1,31 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# This file is free software, which comes along with NIT. This software is
+# distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE. You can modify it is you want, provided this header
+# is kept unaltered, and a notification of the changes is added.
+# You are allowed to redistribute it and sell it, alone or is a part of
+# another product.
+
+# Errors related to JSON parsing.
+module json::error
+
+import nitcc_runtime
+
+# Ill-formed JSON.
+class JsonParseError
+       super Error
+
+       # The location of the error in the original text.
+       var position: nullable Position
+
+       redef fun to_s do
+               var p = position
+               if p isa Position then
+                       return "[{p}] {super}"
+               else
+                       return super
+               end
+       end
+end