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Use HORIZONTAL ELLIPSIS' when available in truncated-print'.
* module/ice-9/pretty-print.scm (truncated-print): Set
`%default-port-encoding' to the encoding of PORT. Choose either
U+2026 or "..." depending on PORT's encoding.
* test-suite/tests/print.test ("truncated-print")[tprint]: New ENCODING
argument. Update existing tests accordingly. Add UTF-8 tests.
* doc/ref/misc-modules.texi (Pretty Printing): Mention the possible use
of U+2026.
This commit is contained in:
Ludovic Courtès
parent
cc7005bc37
commit
c5e05a1c70
3 changed files with 175 additions and 141 deletions
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@ -83,9 +83,11 @@ line in which to do so.
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@print{} #<directory (gui...>
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@end lisp
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@code{truncated-print} will not output a trailing newline. If an
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expression does not fit in the given width, it will be truncated --
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possibly ellipsized, or in the worst case, displayed as @nicode{#}.
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@code{truncated-print} will not output a trailing newline. If an expression does
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not fit in the given width, it will be truncated -- possibly
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ellipsized@footnote{On Unicode-capable ports, the ellipsis is represented by
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character `HORIZONTAL ELLIPSIS' (U+2026), otherwise it is represented by three
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dots.}, or in the worst case, displayed as @nicode{#}.
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@deffn {Scheme Procedure} truncated-print obj [port] [keyword-options]
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Print @var{obj}, truncating the output, if necessary, to make it fit
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@ -1,6 +1,6 @@
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;;;; -*-scheme-*-
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;;;; -*- coding: utf-8; mode: scheme -*-
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;;;;
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;;;; Copyright (C) 2001, 2004, 2006, 2009 Free Software Foundation, Inc.
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;;;; Copyright (C) 2001, 2004, 2006, 2009, 2010 Free Software Foundation, Inc.
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;;;;
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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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@ -271,6 +271,7 @@ port directly after OBJ, like (pretty-print OBJ PORT)."
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per-line-prefix
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(lambda (s) (display s port) #t)))
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;; `truncated-print' was written in 2009 by Andy Wingo, and is not from
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;; genwrite.scm.
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(define* (truncated-print x #:optional port*
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@ -285,123 +286,146 @@ into @var{width} characters. By default, @var{x} will be printed using
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@var{display?} keyword argument.
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The default behaviour is to print depth-first, meaning that the entire
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remaining width will be available to each sub-expressoin of @var{x} --
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remaining width will be available to each sub-expression of @var{x} --
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e.g., if @var{x} is a vector, each member of @var{x}. One can attempt to
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\"ration\" the available width, trying to allocate it equally to each
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sub-expression, via the @var{breadth-first?} keyword argument."
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(define (print-sequence x width len ref next)
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(let lp ((x x)
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(width width)
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(i 0))
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(if (> i 0)
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(display #\space))
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(cond
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((= i len)) ; catches 0-length case
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((= i (1- len))
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(print (ref x i) (if (zero? i) width (1- width))))
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((<= width 4)
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(display "..."))
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(else
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(let ((str (with-output-to-string
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(lambda ()
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(print (ref x i)
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(if breadth-first?
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(max 1
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(1- (floor (/ width (- len i)))))
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(- width 4)))))))
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(display str)
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(lp (next x) (- width 1 (string-length str)) (1+ i)))))))
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;; Make sure string ports are created with the right encoding.
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(with-fluids ((%default-port-encoding (port-encoding port)))
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(define (print-tree x width)
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;; width is >= the width of # . #, which is 5
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(let lp ((x x)
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(width width))
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(cond
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((or (not (pair? x)) (<= width 4))
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(display ". ")
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(print x (- width 2)))
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(else
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;; width >= 5
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(let ((str (with-output-to-string
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(lambda ()
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(print (car x)
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(if breadth-first?
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(floor (/ (- width 3) 2))
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(- width 4)))))))
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(display str)
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(display " ")
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(lp (cdr x) (- width 1 (string-length str))))))))
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(define ellipsis
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;; Choose between `HORIZONTAL ELLIPSIS' (U+2026) and three dots, depending
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;; on the encoding of PORT.
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(let ((e "…"))
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(catch 'encoding-error
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(lambda ()
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(with-output-to-string
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(lambda ()
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(display e))))
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(lambda (key . args)
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"..."))))
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(define (truncate-string str width)
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;; width is < (string-length str)
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(let lp ((fixes '(("#<" . ">")
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("#(" . ")")
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("(" . ")")
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("\"" . "\""))))
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(cond
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((null? fixes)
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"#")
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((and (string-prefix? (caar fixes) str)
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(string-suffix? (cdar fixes) str)
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(>= (string-length str)
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width
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(+ (string-length (caar fixes))
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(string-length (cdar fixes))
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3)))
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(format #f "~a~a...~a"
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(caar fixes)
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(substring str (string-length (caar fixes))
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(- width (string-length (cdar fixes)) 3))
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(cdar fixes)))
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(else
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(lp (cdr fixes))))))
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(let ((ellipsis-width (string-length ellipsis)))
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(define (print x width)
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(cond
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((<= width 0)
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(error "expected a positive width" width))
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((list? x)
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(cond
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((>= width 5)
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(display "(")
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(print-sequence x (- width 2) (length x) (lambda (x i) (car x)) cdr)
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(display ")"))
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(else
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(display "#"))))
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((vector? x)
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(cond
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((>= width 6)
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(display "#(")
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(print-sequence x (- width 3) (vector-length x) vector-ref identity)
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(display ")"))
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(else
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(display "#"))))
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((uniform-vector? x)
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(cond
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((>= width 9)
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(format #t "#~a(" (uniform-vector-element-type x))
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(print-sequence x (- width 6) (uniform-vector-length x)
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uniform-vector-ref identity)
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(display ")"))
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(else
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(display "#"))))
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((pair? x)
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(cond
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((>= width 7)
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(display "(")
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(print-tree x (- width 2))
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(display ")"))
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(else
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(display "#"))))
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(else
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(let* ((str (with-output-to-string
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(lambda () (if display? (display x) (write x)))))
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(len (string-length str)))
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(display (if (<= (string-length str) width)
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str
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(truncate-string str width)))))))
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(define (print-sequence x width len ref next)
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(let lp ((x x)
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(width width)
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(i 0))
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(if (> i 0)
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(display #\space))
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(cond
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((= i len)) ; catches 0-length case
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((= i (1- len))
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(print (ref x i) (if (zero? i) width (1- width))))
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((<= width (+ 1 ellipsis-width))
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(display "..."))
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(else
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(let ((str
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(with-fluids ((%default-port-encoding (port-encoding port)))
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(with-output-to-string
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(lambda ()
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(print (ref x i)
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(if breadth-first?
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(max 1
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(1- (floor (/ width (- len i)))))
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(- width (+ 1 ellipsis-width)))))))))
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(display str)
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(lp (next x) (- width 1 (string-length str)) (1+ i)))))))
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(with-output-to-port port
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(lambda ()
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(print x width))))
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(define (print-tree x width)
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;; width is >= the width of # . #, which is 5
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(let lp ((x x)
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(width width))
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(cond
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((or (not (pair? x)) (<= width 4))
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(display ". ")
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(print x (- width 2)))
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(else
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;; width >= 5
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(let ((str (with-output-to-string
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(lambda ()
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(print (car x)
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(if breadth-first?
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(floor (/ (- width 3) 2))
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(- width 4)))))))
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(display str)
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(display " ")
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(lp (cdr x) (- width 1 (string-length str))))))))
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(define (truncate-string str width)
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;; width is < (string-length str)
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(let lp ((fixes '(("#<" . ">")
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("#(" . ")")
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("(" . ")")
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("\"" . "\""))))
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(cond
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((null? fixes)
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"#")
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((and (string-prefix? (caar fixes) str)
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(string-suffix? (cdar fixes) str)
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(>= (string-length str)
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width
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(+ (string-length (caar fixes))
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(string-length (cdar fixes))
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ellipsis-width)))
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(format #f "~a~a~a~a"
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(caar fixes)
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(substring str (string-length (caar fixes))
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(- width (string-length (cdar fixes))
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ellipsis-width))
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ellipsis
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(cdar fixes)))
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(else
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(lp (cdr fixes))))))
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(define (print x width)
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(cond
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((<= width 0)
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(error "expected a positive width" width))
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((list? x)
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(cond
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((>= width (+ 2 ellipsis-width))
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(display "(")
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(print-sequence x (- width 2) (length x)
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(lambda (x i) (car x)) cdr)
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(display ")"))
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(else
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(display "#"))))
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((vector? x)
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(cond
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((>= width (+ 3 ellipsis-width))
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(display "#(")
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(print-sequence x (- width 3) (vector-length x)
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vector-ref identity)
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(display ")"))
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(else
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(display "#"))))
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((uniform-vector? x)
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(cond
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((>= width 9)
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(format #t "#~a(" (uniform-vector-element-type x))
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(print-sequence x (- width 6) (uniform-vector-length x)
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uniform-vector-ref identity)
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(display ")"))
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(else
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(display "#"))))
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((pair? x)
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(cond
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((>= width (+ 4 ellipsis-width))
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(display "(")
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(print-tree x (- width 2))
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(display ")"))
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(else
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(display "#"))))
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(else
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(let* ((str (with-output-to-string
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(lambda () (if display? (display x) (write x)))))
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(len (string-length str)))
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(display (if (<= (string-length str) width)
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str
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(truncate-string str width)))))))
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(with-output-to-port port
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(lambda ()
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(print x width))))))
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@ -1,4 +1,4 @@
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;;;; -*- scheme -*-
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;;;; -*- coding: utf-8; mode: scheme; -*-
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;;;;
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;;;; Copyright (C) 2010 Free Software Foundation, Inc.
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;;;;
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@ -22,25 +22,33 @@
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(with-test-prefix "truncated-print"
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(define exp '(a b #(c d e) f . g))
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(define (tprint x width)
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(with-output-to-string
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(lambda ()
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(truncated-print x #:width width))))
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(pass-if (equal? (tprint exp 10)
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"(a b . #)"))
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(define (tprint x width encoding)
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(with-fluids ((%default-port-encoding encoding))
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(with-output-to-string
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(lambda ()
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(truncated-print x #:width width)))))
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(pass-if (equal? (tprint exp 15)
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"(a b # f . g)"))
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(pass-if (equal? (tprint exp 10 "ISO-8859-1")
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"(a b . #)"))
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(pass-if (equal? (tprint exp 18)
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"(a b #(c ...) . #)"))
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(pass-if (equal? (tprint exp 15 "ISO-8859-1")
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"(a b # f . g)"))
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(pass-if (equal? (tprint exp 20)
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"(a b #(c d e) f . g)"))
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(pass-if (equal? (tprint exp 18 "ISO-8859-1")
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"(a b #(c ...) . #)"))
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(pass-if (equal? (tprint "The quick brown fox" 20)
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"\"The quick brown...\""))
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(pass-if (equal? (tprint exp 20 "ISO-8859-1")
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"(a b #(c d e) f . g)"))
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(pass-if (equal? (tprint (current-module) 20)
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"#<directory (tes...>")))
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(pass-if (equal? (tprint "The quick brown fox" 20 "ISO-8859-1")
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"\"The quick brown...\""))
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(pass-if (equal? (tprint "The quick brown fox" 20 "UTF-8")
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"\"The quick brown f…\""))
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(pass-if (equal? (tprint (current-module) 20 "ISO-8859-1")
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"#<directory (tes...>"))
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(pass-if (equal? (tprint (current-module) 20 "UTF-8")
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"#<directory (test-…>")))
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