1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
##
# == Manipulates strings like the UNIX Bourne shell
#
# This module manipulates strings according to the word parsing rules
# of the UNIX Bourne shell.
#
# The shellwords() function was originally a port of shellwords.pl,
# but modified to conform to POSIX / SUSv3 (IEEE Std 1003.1-2001 [1]).
#
# === Usage
#
# You can use Shellwords to parse a string into a Bourne shell friendly Array.
#
# require 'shellwords'
#
# argv = Shellwords.split('three blind "mice"')
# argv #=> ["three", "blind", "mice"]
#
# Once you've required Shellwords, you can use the #split alias
# String#shellsplit.
#
# argv = "see how they run".shellsplit
# argv #=> ["see", "how", "they", "run"]
#
# Be careful you don't leave a quote unmatched.
#
# argv = "they all ran after the farmer's wife".shellsplit
# #=> ArgumentError: Unmatched double quote: ...
#
# In this case, you might want to use Shellwords.escape, or its alias
# String#shellescape.
#
# This method will escape the String for you to safely use with a Bourne shell.
#
# argv = Shellwords.escape("special's.txt")
# argv #=> "special\\'s.txt"
# system("cat " + argv)
#
# Shellwords also comes with a core extension for Array, Array#shelljoin.
#
# argv = %w{ls -lta lib}
# system(argv.shelljoin)
#
# You can use this method to create an escaped string out of an array of tokens
# separated by a space. In this example we used the literal shortcut for
# Array.new.
#
# === Authors
# * Wakou Aoyama
# * Akinori MUSHA <knu@iDaemons.org>
#
# === Contact
# * Akinori MUSHA <knu@iDaemons.org> (current maintainer)
#
# === Resources
#
# 1: {IEEE Std 1003.1-2004}[http://pubs.opengroup.org/onlinepubs/009695399/toc.htm]
module Shellwords
# Splits a string into an array of tokens in the same way the UNIX
# Bourne shell does.
#
# argv = Shellwords.split('here are "two words"')
# argv #=> ["here", "are", "two words"]
#
# String#shellsplit is a shortcut for this function.
#
# argv = 'here are "two words"'.shellsplit
# argv #=> ["here", "are", "two words"]
def shellsplit(line)
words = []
field = ''
line.scan(/\G\s*(?>([^\s\\\'\"]+)|'([^\']*)'|"((?:[^\"\\]|\\.)*)"|(\\.?)|(\S))(\s|\z)?/m) do
|word, sq, dq, esc, garbage, sep|
raise ArgumentError, "Unmatched double quote: #{line.inspect}" if garbage
field << (word || sq || (dq || esc).gsub(/\\(.)/, '\\1'))
if sep
words << field
field = ''
end
end
words
end
alias shellwords shellsplit
module_function :shellsplit, :shellwords
class << self
alias split shellsplit
end
# Escapes a string so that it can be safely used in a Bourne shell
# command line. +str+ can be a non-string object that responds to
# +to_s+.
#
# Note that a resulted string should be used unquoted and is not
# intended for use in double quotes nor in single quotes.
#
# argv = Shellwords.escape("It's better to give than to receive")
# argv #=> "It\\'s\\ better\\ to\\ give\\ than\\ to\\ receive"
#
# String#shellescape is a shorthand for this function.
#
# argv = "It's better to give than to receive".shellescape
# argv #=> "It\\'s\\ better\\ to\\ give\\ than\\ to\\ receive"
#
# # Search files in lib for method definitions
# pattern = "^[ \t]*def "
# open("| grep -Ern #{pattern.shellescape} lib") { |grep|
# grep.each_line { |line|
# file, lineno, matched_line = line.split(':', 3)
# # ...
# }
# }
#
# It is the caller's responsibility to encode the string in the right
# encoding for the shell environment where this string is used.
#
# Multibyte characters are treated as multibyte characters, not as bytes.
#
# Returns an empty quoted String if +str+ has a length of zero.
def shellescape(str)
str = str.to_s
# An empty argument will be skipped, so return empty quotes.
return "''" if str.empty?
str = str.dup
# Treat multibyte characters as is. It is the caller's responsibility
# to encode the string in the right encoding for the shell
# environment.
str.gsub!(/([^A-Za-z0-9_\-.,:\/@\n])/, "\\\\\\1")
# A LF cannot be escaped with a backslash because a backslash + LF
# combo is regarded as a line continuation and simply ignored.
str.gsub!(/\n/, "'\n'")
return str
end
module_function :shellescape
class << self
alias escape shellescape
end
# Builds a command line string from an argument list, +array+.
#
# All elements are joined into a single string with fields separated by a
# space, where each element is escaped for the Bourne shell and stringified
# using +to_s+.
#
# ary = ["There's", "a", "time", "and", "place", "for", "everything"]
# argv = Shellwords.join(ary)
# argv #=> "There\\'s a time and place for everything"
#
# Array#shelljoin is a shortcut for this function.
#
# ary = ["Don't", "rock", "the", "boat"]
# argv = ary.shelljoin
# argv #=> "Don\\'t rock the boat"
#
# You can also mix non-string objects in the elements as allowed in Array#join.
#
# output = `#{['ps', '-p', $$].shelljoin}`
#
def shelljoin(array)
array.map { |arg| shellescape(arg) }.join(' ')
end
module_function :shelljoin
class << self
alias join shelljoin
end
end
class String
# call-seq:
# str.shellsplit => array
#
# Splits +str+ into an array of tokens in the same way the UNIX
# Bourne shell does.
#
# See Shellwords.shellsplit for details.
def shellsplit
Shellwords.split(self)
end
# call-seq:
# str.shellescape => string
#
# Escapes +str+ so that it can be safely used in a Bourne shell
# command line.
#
# See Shellwords.shellescape for details.
def shellescape
Shellwords.escape(self)
end
end
class Array
# call-seq:
# array.shelljoin => string
#
# Builds a command line string from an argument list +array+ joining
# all elements escaped for the Bourne shell and separated by a space.
#
# See Shellwords.shelljoin for details.
def shelljoin
Shellwords.join(self)
end
end
|
