FM / base

/usr/share/guile/3.0/system/base

Name	Size	Mode	Actions
types/	-	0755	rm
ck.scm	2201	0644	edit dl rm
compile.scm	14119	0644	edit dl rm
lalr.scm	2048	0644	edit dl rm
lalr.upstream.scm	61710	0644	edit dl rm
language.scm	3408	0644	edit dl rm
message.scm	10098	0644	edit dl rm
optimize.scm	2393	0644	edit dl rm
pmatch.scm	2574	0644	edit dl rm
syntax.scm	13115	0644	edit dl rm
target.scm	6893	0644	edit dl rm
types.scm	19846	0644	edit dl rm

Edit: /usr/share/guile/3.0/system/base/message.scm (10098B)

;;; User interface messages

;;; This library is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; This library 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.  See the GNU Lesser
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public License
;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;;
;;; This module provide a simple interface to send messages to the user.
;;; TODO: Internationalize messages.
;;;
;;; Code:

(define-module (system base message)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9)
  #:use-module (ice-9 match)
  #:export (*current-warning-port*
            *current-warning-prefix*
            warning

warning-type? warning-type-name warning-type-description
            warning-type-printer lookup-warning-type

%warning-types))

;;;
;;; Source location
;;;

(define (location-string loc)
  (if (pair? loc)
      (format #f "~a:~a:~a"
              (or (assoc-ref loc 'filename) "<stdin>")
              (1+ (assoc-ref loc 'line))
              (assoc-ref loc 'column))
      "<unknown-location>"))

;;;
;;; Warnings
;;;

;; This name existed before %current-warning-port was introduced, but
;; otherwise it is a deprecated binding.
(define *current-warning-port*
  ;; Can't play the identifier-syntax deprecation game in Guile 2.0, as
  ;; other modules might depend on this being a normal binding and not a
  ;; syntax binding.
  (parameter-fluid current-warning-port))

(define *current-warning-prefix*
  ;; Prefix string when emitting a warning.
  (make-fluid ";;; "))

(define-record-type <warning-type>
  (make-warning-type name description printer)
  warning-type?
  (name         warning-type-name)
  (description  warning-type-description)
  (printer      warning-type-printer))

(define %warning-types
  ;; List of known warning types.
  (map (lambda (args)
         (apply make-warning-type args))

(let-syntax ((emit
                     (lambda (s)
                       (syntax-case s ()
                         ((_ port fmt args ...)
                          (string? (syntax->datum #'fmt))
                          (with-syntax ((fmt
                                         (string-append "~a"
                                                        (syntax->datum
                                                         #'fmt))))
                            #'(format port fmt
                                      (fluid-ref *current-warning-prefix*)
                                      args ...)))))))
         `((unsupported-warning ;; a "meta warning"
            "warn about unknown warning types"
            ,(lambda (port unused name)
               (emit port "warning: unknown warning type `~A'~%"
                     name)))

(unused-variable
            "report unused variables"
            ,(lambda (port loc name)
               (emit port "~A: warning: unused variable `~A'~%"
                     loc name)))

(unused-toplevel
            "report unused local top-level variables"
            ,(lambda (port loc name)
               (emit port "~A: warning: possibly unused local top-level variable `~A'~%"
                     loc name)))

(shadowed-toplevel
            "report shadowed top-level variables"
            ,(lambda (port loc name previous-loc)
               (emit port "~A: warning: shadows previous definition of `~A' at ~A~%"
                     loc name
                     (location-string previous-loc))))

(unbound-variable
            "report possibly unbound variables"
            ,(lambda (port loc name)
               (emit port "~A: warning: possibly unbound variable `~A'~%"
                     loc name)))

(macro-use-before-definition
            "report possibly mis-use of macros before they are defined"
            ,(lambda (port loc name)
               (emit port "~A: warning: macro `~A' used before definition~%"
                     loc name)))

(use-before-definition
            "report uses of top-levels before they are defined"
            ,(lambda (port loc name)
               (emit port "~A: warning: `~A' used before definition~%"
                     loc name)))

(non-idempotent-definition
            "report names that can refer to imports on first load, but module definitions on second load"
            ,(lambda (port loc name)
               (emit port "~A: warning: non-idempotent binding for `~A'.  When first loaded, value for `~A` comes from imported binding, but later module-local definition overrides it; any module reload would capture module-local binding rather than import.~%"
                     loc name name)))

(arity-mismatch
            "report procedure arity mismatches (wrong number of arguments)"
            ,(lambda (port loc name certain?)
               (if certain?
                   (emit port
                         "~A: warning: wrong number of arguments to `~A'~%"
                         loc name)
                   (emit port
                         "~A: warning: possibly wrong number of arguments to `~A'~%"
                         loc name))))

(duplicate-case-datum
            "report a duplicate datum in a case expression"
            ,(lambda (port loc datum clause case-expr)
               (emit port
                     "~A: warning: duplicate datum ~S in clause ~S of case expression ~S~%"
                     loc datum clause case-expr)))

(bad-case-datum
            "report a case datum that cannot be meaningfully compared using `eqv?'"
            ,(lambda (port loc datum clause case-expr)
               (emit port
                     "~A: warning: datum ~S cannot be meaningfully compared using `eqv?' in clause ~S of case expression ~S~%"
                     loc datum clause case-expr)))

(format
            "report wrong number of arguments to `format'"
            ,(lambda (port loc . rest)
               (define (escape-newlines str)
                 (list->string
                  (string-fold-right (lambda (c r)
                                       (if (eq? c #\newline)
                                           (append '(#\\ #\n) r)
                                           (cons c r)))
                                     '()
                                     str)))

(define (range min max)
                 (cond ((eq? min 'any)
                        (if (eq? max 'any)
                            "any number" ;; can't happen
                            (emit #f "up to ~a" max)))
                       ((eq? max 'any)
                        (emit #f "at least ~a" min))
                       ((= min max) (number->string min))
                       (else
                        (emit #f "~a to ~a" min max))))

(match rest
                 (('simple-format fmt opt)
                  (emit port
                        "~A: warning: ~S: unsupported format option ~~~A, use (ice-9 format) instead~%"
                        loc (escape-newlines fmt) opt))
                 (('wrong-format-arg-count fmt min max actual)
                  (emit port
                        "~A: warning: ~S: wrong number of `format' arguments: expected ~A, got ~A~%"
                        loc (escape-newlines fmt)
                        (range min max) actual))
                 (('syntax-error 'unterminated-iteration fmt)
                  (emit port "~A: warning: ~S: unterminated iteration~%"
                        loc (escape-newlines fmt)))
                 (('syntax-error 'unterminated-conditional fmt)
                  (emit port "~A: warning: ~S: unterminated conditional~%"
                        loc (escape-newlines fmt)))
                 (('syntax-error 'unexpected-semicolon fmt)
                  (emit port "~A: warning: ~S: unexpected `~~;'~%"
                        loc (escape-newlines fmt)))
                 (('syntax-error 'unexpected-conditional-termination fmt)
                  (emit port "~A: warning: ~S: unexpected `~~]'~%"
                        loc (escape-newlines fmt)))
                 (('wrong-port wrong-port)
                  (emit port
                        "~A: warning: ~S: wrong port argument~%"
                        loc wrong-port))
                 (('wrong-format-string fmt)
                  (emit port
                        "~A: warning: ~S: wrong format string~%"
                        loc fmt))
                 (('non-literal-format-string)
                  (emit port
                        "~A: warning: non-literal format string~%"
                        loc))
                 (('wrong-num-args count)
                  (emit port
                        "~A: warning: wrong number of arguments to `format'~%"
                        loc))
                 (else
                  (emit port "~A: `format' warning~%" loc)))))))))

(define (lookup-warning-type name)
  "Return the warning type NAME or `#f' if not found."
  (find (lambda (wt)
          (eq? name (warning-type-name wt)))
        %warning-types))

(define (warning type location . args)
  "Emit a warning of type TYPE for source location LOCATION (a source
property alist) using the data in ARGS."
  (let ((wt   (lookup-warning-type type))
        (port (current-warning-port)))
    (if (warning-type? wt)
        (apply (warning-type-printer wt)
               port (location-string location)
               args)
        (format port "~A: unknown warning type `~A': ~A~%"
                (location-string location) type args))))

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