From e8201d12db87546249e23871b959317580ff81ff Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 8 Nov 2005 23:41:40 +0000
Subject: * lib/shellwords.rb: refactored.  [ruby-core:06581]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9519 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/shellwords.rb | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

(limited to 'lib/shellwords.rb')

diff --git a/lib/shellwords.rb b/lib/shellwords.rb
index e87b9e656b..055a6a5be2 100644
--- a/lib/shellwords.rb
+++ b/lib/shellwords.rb
@@ -28,31 +28,20 @@ module Shellwords
   def shellwords(line)
     line = String.new(line) rescue
       raise(ArgumentError, "Argument must be a string")
-    line.lstrip!
     words = []
-    until line.empty?
-      field = ''
-      loop do
-	if line.sub!(/\A"(([^"\\]|\\.)*)"/, '') then
-	  snippet = $1.gsub(/\\(.)/, '\1')
-	elsif line =~ /\A"/ then
-	  raise ArgumentError, "Unmatched double quote: #{line}"
-	elsif line.sub!(/\A'([^']*)'/, '') then
-	  snippet = $1
-	elsif line =~ /\A'/ then
-	  raise ArgumentError, "Unmatched single quote: #{line}"
-	elsif line.sub!(/\A\\(.)?/, '') then
-	  snippet = $1 || '\\'
-	elsif line.sub!(/\A([^\s\\'"]+)/, '') then
-	  snippet = $1
-	else
-	  line.lstrip!
-	  break
-	end
-	field.concat(snippet)
+    field = ''
+    last = 0
+    sep = nil
+    line.scan(/\G\s*(?:([^\s\\\'\"]+)|'([^\']*)'|"((?:[^\"\\]|\\.)*)"|(\\.?))(\s+|\z)?/m) do
+      last = $~.end(0)
+      sep = $~.begin(5)
+      field << ($1 || $2 || ($3 || $4).gsub(/\\(?=.)/, ''))
+      if sep
+        words << field
+        field = ''
       end
-      words.push(field)
     end
+    raise ArgumentError, "Unmatched double quote: #{line}" if line[last]
     words
   end
 
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