| 1 |
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| 2 | #### recursive arith: one level
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| 3 | a='b=123'
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| 4 | echo $((a))
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| 5 | ## stdout: 123
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| 6 | ## N-I dash status: 2
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| 7 | ## N-I dash stdout-json: ""
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| 8 | ## N-I yash stdout: b=123
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| 9 |
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| 10 | #### recursive arith: two levels
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| 11 | a='b=c' c='d=123'
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| 12 | echo $((a))
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| 13 | ## stdout: 123
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| 14 | ## N-I dash status: 2
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| 15 | ## N-I dash stdout-json: ""
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| 16 | ## N-I yash stdout: b=c
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| 17 |
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| 18 | #### recursive arith: short circuit &&, ||
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| 19 | # Note: mksh R52 has a bug. Even though it supports a short circuit like
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| 20 | # "echo $((cond&&(a=1)))", it doesn't work with "x=a=1; echo
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| 21 | # $((cond&&x))". It is fixed at least in mksh R57.
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| 22 | # Note: "busybox sh" doesn't support short circuit.
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| 23 | a=b=123
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| 24 | echo $((1||a)):$((b))
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| 25 | echo $((0||a)):$((b))
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| 26 | c=d=321
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| 27 | echo $((0&&c)):$((d))
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| 28 | echo $((1&&c)):$((d))
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| 29 | ## STDOUT:
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| 30 | 1:0
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| 31 | 1:123
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| 32 | 0:0
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| 33 | 1:321
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| 34 | ## END
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| 35 |
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| 36 | ## BUG mksh/ash STDOUT:
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| 37 | 1:123
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| 38 | 1:123
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| 39 | 0:321
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| 40 | 1:321
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| 41 | ## END
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| 42 |
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| 43 | ## N-I dash/yash status: 2
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| 44 | ## N-I dash/yash STDOUT:
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| 45 | 1:0
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| 46 | ## END
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| 47 |
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| 48 | #### recursive arith: short circuit ?:
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| 49 | # Note: "busybox sh" behaves strangely.
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| 50 | y=a=123 n=a=321
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| 51 | echo $((1?(y):(n))):$((a))
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| 52 | echo $((0?(y):(n))):$((a))
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| 53 | ## STDOUT:
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| 54 | 123:123
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| 55 | 321:321
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| 56 | ## END
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| 57 | ## BUG ash STDOUT:
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| 58 | 123:321
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| 59 | 321:321
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| 60 | ## END
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| 61 | ## N-I dash status: 2
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| 62 | ## N-I dash stdout-json: ""
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| 63 | ## N-I yash STDOUT:
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| 64 | a=123:0
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| 65 | a=321:0
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| 66 | ## END
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| 67 |
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| 68 | #### recursive arith: side effects
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| 69 | # In Zsh and Busybox sh, the side effect of inner arithmetic
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| 70 | # evaluations seems to take effect only after the whole evaluation.
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| 71 | a='b=c' c='d=123'
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| 72 | echo $((a,d)):$((d))
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| 73 | ## stdout: 123:123
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| 74 | ## BUG zsh/ash stdout: 0:123
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| 75 | ## N-I dash/yash status: 2
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| 76 | ## N-I dash/yash stdout-json: ""
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| 77 |
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| 78 | #### recursive arith: recursion
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| 79 | loop='i<=100&&(s+=i,i++,loop)' s=0 i=0
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| 80 | echo $((a=loop,s))
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| 81 | ## stdout: 5050
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| 82 | ## N-I mksh status: 1
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| 83 | ## N-I mksh stdout-json: ""
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| 84 | ## N-I ash/dash/yash status: 2
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| 85 | ## N-I ash/dash/yash stdout-json: ""
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| 86 |
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| 87 | #### recursive arith: array elements
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| 88 | text[1]='d=123'
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| 89 | text[2]='text[1]'
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| 90 | text[3]='text[2]'
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| 91 | echo $((a=text[3]))
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| 92 | ## stdout: 123
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| 93 | ## N-I ash/dash/yash status: 2
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| 94 | ## N-I ash/dash/yash stdout-json: ""
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| 95 |
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| 96 | #### dynamic arith varname: assign
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| 97 | vec2_set () {
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| 98 | local this=$1 x=$2 y=$3
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| 99 | : $(( ${this}_x = $2 ))
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| 100 | : $(( ${this}_y = y ))
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| 101 | }
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| 102 | vec2_set a 3 4
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| 103 | vec2_set b 5 12
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| 104 | echo a_x=$a_x a_y=$a_y
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| 105 | echo b_x=$b_x b_y=$b_y
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| 106 | ## STDOUT:
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| 107 | a_x=3 a_y=4
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| 108 | b_x=5 b_y=12
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| 109 | ## END
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| 110 |
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| 111 | #### dynamic arith varname: read
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| 112 |
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| 113 | vec2_load() {
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| 114 | local this=$1
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| 115 | x=$(( ${this}_x ))
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| 116 | : $(( y = ${this}_y ))
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| 117 | }
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| 118 | a_x=12 a_y=34
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| 119 | vec2_load a
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| 120 | echo x=$x y=$y
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| 121 | ## STDOUT:
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| 122 | x=12 y=34
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| 123 | ## END
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| 124 |
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| 125 | #### dynamic arith varname: copy/add
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| 126 | shopt -s eval_unsafe_arith # for RHS
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| 127 |
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| 128 | vec2_copy () {
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| 129 | local this=$1 rhs=$2
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| 130 | : $(( ${this}_x = $(( ${rhs}_x )) ))
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| 131 | : $(( ${this}_y = ${rhs}_y ))
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| 132 | }
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| 133 | vec2_add () {
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| 134 | local this=$1 rhs=$2
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| 135 | : $(( ${this}_x += $(( ${rhs}_x )) ))
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| 136 | : $(( ${this}_y += ${rhs}_y ))
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| 137 | }
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| 138 | a_x=3 a_y=4
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| 139 | b_x=4 b_y=20
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| 140 | vec2_copy c a
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| 141 | echo c_x=$c_x c_y=$c_y
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| 142 | vec2_add c b
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| 143 | echo c_x=$c_x c_y=$c_y
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| 144 | ## STDOUT:
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| 145 | c_x=3 c_y=4
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| 146 | c_x=7 c_y=24
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| 147 | ## END
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| 148 |
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| 149 | #### is-array with ${var@a}
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| 150 | case $SH in (mksh|ash|dash|yash) exit 1 ;; esac
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| 151 |
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| 152 | function ble/is-array { [[ ${!1@a} == *a* ]]; }
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| 153 |
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| 154 | ble/is-array undef
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| 155 | echo undef $?
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| 156 |
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| 157 | string=''
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| 158 | ble/is-array string
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| 159 | echo string $?
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| 160 |
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| 161 | array=(one two three)
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| 162 | ble/is-array array
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| 163 | echo array $?
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| 164 | ## STDOUT:
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| 165 | undef 1
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| 166 | string 1
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| 167 | array 0
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| 168 | ## END
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| 169 | ## N-I zsh/mksh/ash/dash/yash status: 1
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| 170 | ## N-I zsh/mksh/ash/dash/yash stdout-json: ""
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| 171 |
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| 172 |
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| 173 | #### Sparse array with big index
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| 174 |
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| 175 | # TODO: more BashArray idioms / stress tests ?
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| 176 |
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| 177 | a=()
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| 178 |
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| 179 | if false; then
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| 180 | # This takes too long! # From Zulip
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| 181 | i=$(( 0x0100000000000000 ))
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| 182 | else
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| 183 | # smaller number that's OK
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| 184 | i=$(( 0x0100000 ))
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| 185 | fi
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| 186 |
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| 187 | a[i]=1
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| 188 |
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| 189 | echo len=${#a[@]}
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| 190 |
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| 191 | ## STDOUT:
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| 192 | len=1
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| 193 | ## END
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| 194 |
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| 195 | ## N-I ash status: 2
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| 196 | ## N-I ash STDOUT:
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| 197 | ## END
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| 198 |
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| 199 | ## BUG zsh STDOUT:
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| 200 | len=1048576
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| 201 | ## END
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| 202 |
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| 203 |
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| 204 | #### shift unshift reverse
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| 205 |
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| 206 | case $SH in mksh|ash) exit ;; esac
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| 207 |
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| 208 | # https://github.com/akinomyoga/ble.sh/blob/79beebd928cf9f6506a687d395fd450d027dc4cd/src/util.sh#L578-L582
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| 209 |
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| 210 | # @fn ble/array#unshift arr value...
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| 211 | function ble/array#unshift {
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| 212 | builtin eval -- "$1=(\"\${@:2}\" \"\${$1[@]}\")"
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| 213 | }
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| 214 | # @fn ble/array#shift arr count
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| 215 | function ble/array#shift {
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| 216 | # Note: Bash 4.3 以下では ${arr[@]:${2:-1}} が offset='${2'
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| 217 | # length='-1' に解釈されるので、先に算術式展開させる。
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| 218 | builtin eval -- "$1=(\"\${$1[@]:$((${2:-1}))}\")"
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| 219 | }
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| 220 | # @fn ble/array#reverse arr
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| 221 | function ble/array#reverse {
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| 222 | builtin eval "
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| 223 | set -- \"\${$1[@]}\"; $1=()
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| 224 | local e$1 i$1=\$#
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| 225 | for e$1; do $1[--i$1]=\"\$e$1\"; done"
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| 226 | }
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| 227 |
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| 228 | a=( {1..6} )
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| 229 | echo "${a[@]}"
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| 230 |
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| 231 | ble/array#shift a 1
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| 232 | echo "${a[@]}"
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| 233 |
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| 234 | ble/array#shift a 2
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| 235 | echo "${a[@]}"
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| 236 |
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| 237 | echo ---
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| 238 |
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| 239 | ble/array#unshift a 99
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| 240 | echo "${a[@]}"
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| 241 |
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| 242 | echo ---
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| 243 |
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| 244 | # doesn't work in zsh!
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| 245 | ble/array#reverse a
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| 246 | echo "${a[@]}"
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| 247 |
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| 248 |
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| 249 | ## STDOUT:
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| 250 | 1 2 3 4 5 6
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| 251 | 2 3 4 5 6
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| 252 | 4 5 6
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| 253 | ---
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| 254 | 99 4 5 6
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| 255 | ---
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| 256 | 6 5 4 99
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| 257 | ## END
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| 258 |
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| 259 | ## BUG zsh STDOUT:
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| 260 | 1 2 3 4 5 6
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| 261 | 2 3 4 5 6
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| 262 | 4 5 6
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| 263 | ---
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| 264 | 99 4 5 6
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| 265 | ---
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| 266 | 5 4 99
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| 267 | ## END
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| 268 |
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| 269 | ## N-I mksh/ash STDOUT:
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| 270 | ## END
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| 271 |
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| 272 |
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| 273 | #### SparseArray Performance demo
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| 274 |
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| 275 | case $SH in bash|zsh|mksh|ash) exit ;; esac
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| 276 |
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| 277 | #pp line (a)
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| 278 |
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| 279 | a=( foo {25..27} bar )
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| 280 |
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| 281 | a[10]='sparse'
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| 282 |
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| 283 | var sp = _a2sp(a)
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| 284 | echo $[type(sp)]
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| 285 |
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| 286 | echo len: $[_opsp(sp, 'len')]
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| 287 |
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| 288 | #echo $[len(sp)]
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| 289 |
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| 290 | shopt -s ysh:upgrade
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| 291 |
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| 292 | echo subst: @[_opsp(sp, 'subst')]
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| 293 | echo keys: @[_opsp(sp, 'keys')]
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| 294 |
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| 295 | echo slice: @[_opsp(sp, 'slice', 2, 5)]
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| 296 |
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| 297 | call _opsp(sp, 'set', 0, 'set0')
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| 298 |
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| 299 | echo get0: $[_opsp(sp, 'get', 0)]
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| 300 | echo get1: $[_opsp(sp, 'get', 1)]
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| 301 | echo ---
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| 302 |
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| 303 | to_append=(x y)
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| 304 | echo append
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| 305 | call _opsp(sp, 'append', to_append)
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| 306 | echo subst: @[_opsp(sp, 'subst')]
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| 307 | echo keys: @[_opsp(sp, 'keys')]
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| 308 | echo ---
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| 309 |
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| 310 | echo unset
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| 311 | call _opsp(sp, 'unset', 11)
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| 312 | echo subst: @[_opsp(sp, 'subst')]
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| 313 | echo keys: @[_opsp(sp, 'keys')]
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| 314 |
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| 315 | ## STDOUT:
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| 316 | SparseArray
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| 317 | len: 6
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| 318 | subst: foo 25 26 27 bar sparse
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| 319 | keys: 0 1 2 3 4 10
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| 320 | slice: 26 27 bar
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| 321 | get0: set0
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| 322 | get1: 25
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| 323 | ---
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| 324 | append
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| 325 | subst: set0 25 26 27 bar sparse x y
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| 326 | keys: 0 1 2 3 4 10 11 12
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| 327 | ---
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| 328 | unset
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| 329 | subst: set0 25 26 27 bar sparse y
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| 330 | keys: 0 1 2 3 4 10 12
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| 331 | ## END
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| 332 |
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| 333 | ## N-I bash/zsh/mksh/ash STDOUT:
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| 334 | ## END
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