Feature #5129

Create a core class "FileArray" and make "ARGF" its instance

Added by Joey Zhou over 2 years ago. Updated over 1 year ago.

[ruby-core:38644]
Status:Assigned
Priority:Normal
Assignee:Yukihiro Matsumoto
Category:-
Target version:next minor

Description

I suggest to create a class "FileArray" whose instance behaves just like ARGF do.
And I think ARGF should be an instance of FileArray. Now when I "p ARGF.class", I get "ARGF.class", so ARGF is an instance of ARGF.class, how meaningless it is.

FileArray methods:

create an instance

fa = FileArray.new('a.txt','b.txt','c.txt')

take many methods from IO

most methods from ARGF should be instance methods of ARGF

fa.each {|line| puts line }
fa.realines
fa.filename # current file

but "argv" not

p fa.file_list # in ARGF, its ARGF.argv, but #argv is not a proper name for FileArray

ARGV array can be modified, adding new file into it, all replace to a new file list.

FileArray should add some methods to modify the inner file list.

fa.insert(3,"d.txt")
fa.delete('a.txt')

With FileArray, You can create multiple ARGF-like file arrays simultaneously.

For example, I want to mix two groups of files, not two files:

afiles = FileArray.new(Dir.glob('a.txt'))
b
files = FileArray.new(Dir.glob('b.txt'))

enuma = afiles.each
enumb = bfiles.each

loop do
puts enuma.next
puts enum
b.next
end

History

#1 Updated by Yusuke Endoh about 2 years ago

  • Status changed from Open to Assigned
  • Assignee set to Yukihiro Matsumoto

Hello,

I like the idea, but it requires matz's approval.

Now when I "p ARGF.class", I get "ARGF.class", so ARGF is an instance of ARGF.class, how meaningless it is.

FYI: In fact, it is meaningful. You can "exploit" it.

$ cat a.txt
foo
$ cat b.txt
bar
$ ruby -e 'p ARGF.class.new("a.txt", "b.txt").read'
"foo\nbar\n"

I'm not sure if this behavior is the spec, though.

Yusuke Endoh mame@tsg.ne.jp

#2 Updated by Yusuke Endoh over 1 year ago

  • Target version set to next minor

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