; error handling code for the system

(in-package "VERRAZANO")

; root error class
(define-condition frontend-error (error)())

; error generating temporary C file
(define-condition tempcpp-error (frontend-error)())

; an error running GCC-XML
(define-condition gccxml-error (frontend-error)())

; an error running the preprocessor
(define-condition preprocessor-error (frontend-error)())

; generate an error message
(defgeneric generate-error-message (err))

; generate an error message for unknown error
(defmethod generate-error-message (err)
  "Unknown error occurred in the frontend.")

; generate an error message for temporary C++ file error
(defmethod generate-error-message ((err tempcpp-error))
  "An error occurred generating a temporary C++ file
   to pass to GCC-XML. Ensure that you have write
   permissions to the Verrazano temporary directory.")

; generate an error message for a GCC-XML error
(defmethod generate-error-message ((err gccxml-error))
  "An error occurred running GCC-XML. Please ensure
   that GCC-XML is properly installed and in your path,
   and please ensure that the library to which you are
   trying to bind is available to Verrazano.")

; generate an error message for a preprocessor error
(defmethod generate-error-message ((err preprocessor-error))
  "An error occurred running the C/C++ preprocessor. Please
   ensure that the C/C++ preprocessor is installed and
   available to Verrazano from the command line.")