1	#!/usr/bin/env bash
2
3	#### [[ glob matching, [[ has no glob expansion
4	[[ foo.py == *.py ]] && echo true
5	[[ foo.p == *.py ]] || echo false
6	## stdout-json: "true\nfalse\n"
7
8	#### [[ glob matching with escapes
9	[[ 'foo.*' == *."*" ]] && echo true
10	# note that the pattern arg to fnmatch should be '*.\*'
11	## stdout: true
12
13	#### equality
14	[[ '*.py' == '*.py' ]] && echo true
15	[[ foo.py == '*.py' ]] || echo false
16	## stdout-json: "true\nfalse\n"
17
18	#### [[ glob matching with unquoted var
19	pat=*.py
20	[[ foo.py == $pat ]] && echo true
21	[[ foo.p == $pat ]] || echo false
22	## stdout-json: "true\nfalse\n"
23
24	#### [[ regex matching
25	# mksh doesn't have this syntax of regex matching. I guess it comes from perl?
26	regex='.*\.py'
27	[[ foo.py =~ $regex ]] && echo true
28	[[ foo.p =~ $regex ]] || echo false
29	## stdout-json: "true\nfalse\n"
30	## N-I mksh stdout-json: ""
31	## N-I mksh status: 1
32
33	#### [[ regex syntax error
34	# hm, it doesn't show any error, but it exits 2.
35	[[ foo.py =~ * ]] && echo true
36	## status: 2
37	## N-I mksh status: 1
38
39	#### [[ has no word splitting
40	var='one two'
41	[[ 'one two' == $var ]] && echo true
42	## stdout: true
43
44	#### [[ has quote joining
45	var='one two'
46	[[ 'one 'tw"o" == $var ]] && echo true
47	## stdout: true
48
49	#### [[ empty string is false
50	[[ 'a' ]] && echo true
51	[[ '' ]] || echo false
52	## stdout-json: "true\nfalse\n"
53
54	#### && chain
55	[[ t && t && '' ]] || echo false
56	## stdout: false
57
58	#### || chain
59	[[ '' || '' || t ]] && echo true
60	## stdout: true
61
62	#### [[ compound expressions
63	# Notes on whitespace:
64	# - 1 and == need space seprating them, but ! and ( don't.
65	# - [[ needs whitesapce after it, but ]] doesn't need whitespace before it!
66	[[ ''||! (1 == 2)&&(2 == 2)]] && echo true
67	## stdout: true
68
69	# NOTE on the two cases below. We're comparing
70	# (a || b) && c vs. a || (b && c)
71	#
72	# a = true, b = false, c = false is an example where they are different.
73	# && and || have precedence inside
74
75	#### precedence of && and || inside [[
76	[[ True || '' && '' ]] && echo true
77	## stdout: true
78
79	#### precedence of && and || in a command context
80	if test True || test '' && test ''; then
81	echo YES
82	else
83	echo "NO precedence"
84	fi
85	## stdout: NO precedence
86
87	# http://tldp.org/LDP/abs/html/testconstructs.html#DBLBRACKETS
88
89	#### Octal literals with -eq
90	decimal=15
91	octal=017 # = 15 (decimal)
92	[[ $decimal -eq $octal ]] && echo true
93	[[ $decimal -eq ZZZ$octal ]] || echo false
94	## stdout-json: "true\nfalse\n"
95	## N-I mksh stdout: false
96	# mksh doesn't implement this syntax for literals.
97
98	#### Hex literals with -eq
99	decimal=15
100	hex=0x0f # = 15 (decimal)
101	[[ $decimal -eq $hex ]] && echo true
102	[[ $decimal -eq ZZZ$hex ]] || echo false
103	## stdout-json: "true\nfalse\n"
104	## N-I mksh stdout: false
105
106	# TODO: Add tests for this
107	# https://www.gnu.org/software/bash/manual/bash.html#Bash-Conditional-Expressions
108	# When used with [[, the ‘<’ and ‘>’ operators sort lexicographically using the
109	# current locale. The test command uses ASCII ordering.
110
111	#### > on strings
112	# NOTE: < doesn't need space, even though == does? That's silly.
113	[[ b>a ]] && echo true
114	[[ b<a ]] || echo false
115	## stdout-json: "true\nfalse\n"
116
117	#### != on strings
118	# NOTE: b!=a does NOT work
119	[[ b != a ]] && echo true
120	[[ a != a ]] || echo false
121	## stdout-json: "true\nfalse\n"
122
123	#### -eq on strings
124	# This is lame behavior: it does a conversion to 0 first for any string
125	[[ a -eq a ]] && echo true
126	[[ a -eq b ]] && echo true
127	## stdout-json: "true\ntrue\n"
128	## OK bash/mksh stdout-json: "true\ntrue\n"
129
130	#### [[ compare with literal -f (compare with test-builtin.test.sh)
131	var=-f
132	[[ $var == -f ]] && echo true
133	[[ '-f' == $var ]] && echo true
134	## stdout-json: "true\ntrue\n"
135
136	#### [[ with op variable (compare with test-builtin.test.sh)
137	# Parse error -- parsed BEFORE evaluation of vars
138	op='=='
139	[[ a $op a ]] && echo true
140	[[ a $op b ]] || echo false
141	## status: 2
142	## OK mksh status: 1
143
144	#### [[ with unquoted empty var (compare with test-builtin.test.sh)
145	empty=''
146	[[ $empty == '' ]] && echo true
147	## stdout: true
148
149	#### [[ at runtime doesn't work
150	dbracket=[[
151	$dbracket foo == foo ]]
152	## status: 127
153
154	#### [[ with env prefix doesn't work
155	FOO=bar [[ foo == foo ]]
156	## status: 127
157
158	#### [[ over multiple lines is OK
159	# Hm it seems you can't split anywhere?
160	[[ foo == foo
161	&& bar == bar
162	]] && echo true
163	## status: 0
164	## stdout-json: "true\n"
165
166	#### Argument that looks like a command word operator
167	[[ -f -f ]] || echo false
168	[[ -f == ]] || echo false
169	## stdout-json: "false\nfalse\n"
170
171	#### Argument that looks like a real operator
172	[[ -f < ]] && echo 'should be parse error'
173	## status: 2
174	## OK mksh status: 1
175
176	#### Does user array equal "$@" ?
177	# Oh it coerces both to a string. Lame.
178	# I think it disobeys "${a[@]}", and treats it like an UNQUOTED ${a[@]}.
179	# NOTE: set -o strict-array should make this invalid
180	a=(1 3 5)
181	b=(1 2 3)
182	set -- 1 3 5
183	[[ "$@" = "${a[@]}" ]] && echo true
184	[[ "$@" = "${b[@]}" ]] || echo false
185	## STDOUT:
186	true
187	false
188	## END
189
190	#### Array coerces to string
191	# TODO: set -o strict-array should make this invalid
192	a=(1 3 5)
193	[[ '1 3 5' = "${a[@]}" ]] && echo true
194	[[ '1 3 4' = "${a[@]}" ]] || echo false
195	## STDOUT:
196	true
197	false
198	## END
199
200	#### Quotes don't matter in comparison
201	[[ '3' = 3 ]] && echo true
202	[[ '3' -eq 3 ]] && echo true
203	## stdout-json: "true\ntrue\n"
204
205	#### -eq with arithmetic expression!
206	[[ 1+2 -eq 3 ]] && echo true
207	expr='1+2'
208	[[ $expr -eq 3 ]] && echo true # must be dynamically parsed
209	## STDOUT:
210	true
211	true
212	## END
213
214	#### -eq coercion produces weird results
215	[[ '' -eq 0 ]] && echo true
216	## stdout: true
217
218	#### [[ '(' ]] is treated as literal
219	[[ '(' ]]
220	echo status=$?
221	## stdout: status=0
222
223	#### [[ '(' foo ]] is syntax error
224	[[ '(' foo ]]
225	echo status=$?
226	## status: 2
227	## OK mksh status: 1
228
229	#### empty ! is treated as literal
230	[[ '!' ]]
231	echo status=$?
232	## stdout: status=0
233
234	#### [[ -z ]] is syntax error
235	[[ -z ]]
236	echo status=$?
237	## status: 2
238	## OK mksh status: 1
239
240	#### [[ -z '>' ]]
241	[[ -z '>' ]] || echo false # -z is operator
242	## stdout: false
243
244	#### [[ -z '>' a ]] is syntax error
245	[[ -z '>' -- ]]
246	echo status=$?
247	## status: 2
248	## OK mksh status: 1
249
250	#### test whether ']]' is empty
251	[[ ']]' ]]
252	echo status=$?
253	## status: 0
254
255	#### [[ ]] is syntax error
256	[[ ]]
257	echo status=$?
258	## stdout-json: ""
259	## status: 2
260	## OK mksh status: 1
261
262	#### [[ && ]] is syntax error
263	[[ && ]]
264	echo status=$?
265	## stdout-json: ""
266	## status: 2
267	## OK mksh status: 1