+ "Read a module from PATH, to exercise the machinery.
+
+ If REASON is non-nil, then output the module to `*debugout-pathname*' with
+ that REASON.
+
+ Return a two-element list (NERROR NWARNING) of the number of errors and
+ warnings encountered while processing the module."
+ (multiple-value-bind (module nerror nwarning)
+ (count-and-report-errors () (read-module path))
+ (when reason
+ (with-open-file (out *debugout-pathname*
+ :direction :output
+ :if-exists :supersede
+ :if-does-not-exist :create)
+ (output-module module reason out)))
+ (list nerror nwarning)))
+
+(export 'test-parse-c-type)
+(defun test-parse-c-type (string)
+ "Parse STRING as a C type, with optional kernel, and show the results."
+ (with-input-from-string (in string)
+ (let* ((*module-type-map* (make-hash-table))
+ (charscan (make-instance 'charbuf-scanner
+ :stream in
+ :filename "<string>"))
+ (tokscan (make-instance 'sod-token-scanner
+ :char-scanner charscan
+ :filename "<string>")))
+ (with-parser-context (token-scanner-context :scanner tokscan)
+ (multiple-value-bind (value winp consumedp)
+ (parse (seq ((decls (parse-c-type tokscan))
+ (type (parse-declarator tokscan decls :abstractp t))
+ :eof)
+ type))
+ (declare (ignore consumedp))
+ (if winp
+ (values t (car value) (cdr value)
+ (princ-to-string (car value)))
+ (values nil value)))))))
+
+(export 'test-parser)
+(defmacro test-parser ((scanner &key backtrace) parser input)
+ "Convenient macro for testing parsers at the REPL.
+
+ This is a macro so that the parser can use the fancy syntax. The name
+ SCANNER is bound to a `sod-token-scanner' reading tokens from the INPUT
+ string. Then the PARSER is invoked and three values are returned: the
+ result of the parse, or `nil' if the main parse failed; a list containing
+ the number of errors and warnings (respectively) reported during the
+ parse; and a list consisting of the lookahead token type and value, and a
+ string containing the untokenized remaining input.
+
+ If BACKTRACE is nil (the default) then leave errors to the calling
+ environment to sort out (e.g., by entering the Lisp debugger); otherwise,
+ catch and report them as they happen so that you can test error recovery
+ strategies."
+ (once-only (input)
+ (with-gensyms (char-scanner value winp body consumedp where nerror nwarn)
+ `(let ((,char-scanner nil) (,scanner nil))
+ (with-parser-context (token-scanner-context :scanner ,scanner)
+ (multiple-value-bind (,value ,nerror ,nwarn)
+ (flet ((,body ()
+ (setf ,char-scanner (make-string-scanner ,input)
+ ,scanner (make-instance
+ 'sod-token-scanner
+ :char-scanner ,char-scanner))
+ (multiple-value-bind (,value ,winp ,consumedp)
+ (parse ,parser)
+ (declare (ignore ,consumedp))
+ (cond (,winp ,value)
+ (t (syntax-error ,scanner ,value)
+ nil)))))
+ (if ,backtrace (,body)
+ (count-and-report-errors ()
+ (with-default-error-location (,scanner)
+ (,body)))))
+ (let ((,where (scanner-capture-place ,char-scanner)))
+ (values ,value
+ (list ,nerror ,nwarn)
+ (and ,scanner (list (token-type ,scanner)
+ (token-value ,scanner)
+ (subseq ,input ,where)))))))))))
~mdw / sod / blobdiff