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225 lines
8.7 KiB
Scheme
225 lines
8.7 KiB
Scheme
;;; User interface messages
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;; Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
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;;; This library is free software; you can redistribute it and/or
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;;; modify it under the terms of the GNU Lesser General Public
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;;; License as published by the Free Software Foundation; either
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;;; version 3 of the License, or (at your option) any later version.
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;;;
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;;; This library is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Lesser General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Lesser General Public
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;;; License along with this library; if not, write to the Free Software
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;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Commentary:
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;;;
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;;; This module provide a simple interface to send messages to the user.
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;;; TODO: Internationalize messages.
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;;;
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;;; Code:
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(define-module (system base message)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (ice-9 match)
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#:export (*current-warning-port*
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*current-warning-prefix*
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warning
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warning-type? warning-type-name warning-type-description
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warning-type-printer lookup-warning-type
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%warning-types))
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;;;
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;;; Source location
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;;;
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(define (location-string loc)
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(if (pair? loc)
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(format #f "~a:~a:~a"
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(or (assoc-ref loc 'filename) "<stdin>")
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(1+ (assoc-ref loc 'line))
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(assoc-ref loc 'column))
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"<unknown-location>"))
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;;;
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;;; Warnings
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;;;
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;; This name existed before %current-warning-port was introduced, but
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;; otherwise it is a deprecated binding.
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(define *current-warning-port*
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;; Can't play the identifier-syntax deprecation game in Guile 2.0, as
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;; other modules might depend on this being a normal binding and not a
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;; syntax binding.
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(parameter-fluid current-warning-port))
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(define *current-warning-prefix*
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;; Prefix string when emitting a warning.
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(make-fluid ";;; "))
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(define-record-type <warning-type>
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(make-warning-type name description printer)
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warning-type?
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(name warning-type-name)
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(description warning-type-description)
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(printer warning-type-printer))
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(define %warning-types
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;; List of known warning types.
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(map (lambda (args)
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(apply make-warning-type args))
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(let-syntax ((emit
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(lambda (s)
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(syntax-case s ()
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((_ port fmt args ...)
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(string? (syntax->datum #'fmt))
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(with-syntax ((fmt
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(string-append "~a"
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(syntax->datum
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#'fmt))))
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#'(format port fmt
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(fluid-ref *current-warning-prefix*)
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args ...)))))))
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`((unsupported-warning ;; a "meta warning"
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"warn about unknown warning types"
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,(lambda (port unused name)
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(emit port "warning: unknown warning type `~A'~%"
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name)))
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(unused-variable
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"report unused variables"
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,(lambda (port loc name)
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(emit port "~A: warning: unused variable `~A'~%"
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loc name)))
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(unused-toplevel
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"report unused local top-level variables"
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,(lambda (port loc name)
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(emit port "~A: warning: possibly unused local top-level variable `~A'~%"
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loc name)))
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(unbound-variable
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"report possibly unbound variables"
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,(lambda (port loc name)
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(emit port "~A: warning: possibly unbound variable `~A'~%"
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loc name)))
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(arity-mismatch
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"report procedure arity mismatches (wrong number of arguments)"
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,(lambda (port loc name certain?)
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(if certain?
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(emit port
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"~A: warning: wrong number of arguments to `~A'~%"
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loc name)
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(emit port
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"~A: warning: possibly wrong number of arguments to `~A'~%"
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loc name))))
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(duplicate-case-datum
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"report a duplicate datum in a case expression"
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,(lambda (port loc datum clause case-expr)
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(emit port
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"~A: warning: duplicate datum ~S in clause ~S of case expression ~S~%"
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loc datum clause case-expr)))
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(bad-case-datum
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"report a case datum that cannot be meaningfully compared using `eqv?'"
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,(lambda (port loc datum clause case-expr)
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(emit port
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"~A: warning: datum ~S cannot be meaningfully compared using `eqv?' in clause ~S of case expression ~S~%"
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loc datum clause case-expr)))
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(format
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"report wrong number of arguments to `format'"
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,(lambda (port loc . rest)
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(define (escape-newlines str)
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(list->string
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(string-fold-right (lambda (c r)
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(if (eq? c #\newline)
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(append '(#\\ #\n) r)
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(cons c r)))
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'()
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str)))
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(define (range min max)
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(cond ((eq? min 'any)
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(if (eq? max 'any)
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"any number" ;; can't happen
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(emit #f "up to ~a" max)))
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((eq? max 'any)
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(emit #f "at least ~a" min))
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((= min max) (number->string min))
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(else
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(emit #f "~a to ~a" min max))))
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(match rest
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(('simple-format fmt opt)
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(emit port
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"~A: warning: ~S: unsupported format option ~~~A, use (ice-9 format) instead~%"
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loc (escape-newlines fmt) opt))
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(('wrong-format-arg-count fmt min max actual)
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(emit port
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"~A: warning: ~S: wrong number of `format' arguments: expected ~A, got ~A~%"
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loc (escape-newlines fmt)
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(range min max) actual))
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(('syntax-error 'unterminated-iteration fmt)
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(emit port "~A: warning: ~S: unterminated iteration~%"
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loc (escape-newlines fmt)))
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(('syntax-error 'unterminated-conditional fmt)
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(emit port "~A: warning: ~S: unterminated conditional~%"
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loc (escape-newlines fmt)))
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(('syntax-error 'unexpected-semicolon fmt)
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(emit port "~A: warning: ~S: unexpected `~~;'~%"
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loc (escape-newlines fmt)))
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(('syntax-error 'unexpected-conditional-termination fmt)
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(emit port "~A: warning: ~S: unexpected `~~]'~%"
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loc (escape-newlines fmt)))
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(('wrong-port wrong-port)
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(emit port
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"~A: warning: ~S: wrong port argument~%"
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loc wrong-port))
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(('wrong-format-string fmt)
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(emit port
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"~A: warning: ~S: wrong format string~%"
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loc fmt))
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(('non-literal-format-string)
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(emit port
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"~A: warning: non-literal format string~%"
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loc))
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(('wrong-num-args count)
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(emit port
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"~A: warning: wrong number of arguments to `format'~%"
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loc))
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(else
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(emit port "~A: `format' warning~%" loc)))))))))
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(define (lookup-warning-type name)
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"Return the warning type NAME or `#f' if not found."
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(find (lambda (wt)
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(eq? name (warning-type-name wt)))
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%warning-types))
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(define (warning type location . args)
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"Emit a warning of type TYPE for source location LOCATION (a source
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property alist) using the data in ARGS."
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(let ((wt (lookup-warning-type type))
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(port (current-warning-port)))
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(if (warning-type? wt)
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(apply (warning-type-printer wt)
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port (location-string location)
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args)
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(format port "~A: unknown warning type `~A': ~A~%"
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(location-string location) type args))))
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;;; message.scm ends here
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