| 1 | ## our_shell: ysh
|
| 2 |
|
| 3 | #### For loop over expression: List
|
| 4 | var mylist = [1, 2, 3]
|
| 5 | for item in (mylist) {
|
| 6 | echo "item $item"
|
| 7 | }
|
| 8 |
|
| 9 | ## STDOUT:
|
| 10 | item 1
|
| 11 | item 2
|
| 12 | item 3
|
| 13 | ## END
|
| 14 |
|
| 15 | #### For loop over expression: Dict, not BashAssoc
|
| 16 |
|
| 17 | var mydict = {name: 'bob', age: 40}
|
| 18 | for key in (mydict) {
|
| 19 | echo "key $key"
|
| 20 | }
|
| 21 |
|
| 22 | # We can declare this
|
| 23 | shopt --unset no_osh_builtins
|
| 24 | declare -A A=([name]=bob)
|
| 25 |
|
| 26 | # But there is no iteration
|
| 27 | for key in (A) {
|
| 28 | echo "key $key"
|
| 29 | }
|
| 30 |
|
| 31 | ## status: 3
|
| 32 | ## STDOUT:
|
| 33 | key name
|
| 34 | key age
|
| 35 | ## END
|
| 36 |
|
| 37 |
|
| 38 | #### For loop over range
|
| 39 | var myrange = 0 ..< 3
|
| 40 | for i in (myrange) {
|
| 41 | echo "i $i"
|
| 42 | }
|
| 43 |
|
| 44 | ## STDOUT:
|
| 45 | i 0
|
| 46 | i 1
|
| 47 | i 2
|
| 48 | ## END
|
| 49 |
|
| 50 | #### Shell for loop with index (equivalent of enumerate())
|
| 51 | for i, item in a b c {
|
| 52 | echo "$i $item"
|
| 53 | }
|
| 54 | ## STDOUT:
|
| 55 | 0 a
|
| 56 | 1 b
|
| 57 | 2 c
|
| 58 | ## END
|
| 59 |
|
| 60 | #### 3 indices with (mylist) is a runtime error
|
| 61 | for i, item bad in (['foo', 'bar']) {
|
| 62 | echo "$i $item $bad"
|
| 63 | }
|
| 64 | ## status: 2
|
| 65 |
|
| 66 | #### Shell for loop can't have 3 indices
|
| 67 | for i, bad, bad in a b c {
|
| 68 | echo $i $item
|
| 69 | }
|
| 70 | ## status: 2
|
| 71 |
|
| 72 | #### Any for loop can't have 4 indices
|
| 73 | for a, b, c, d in (['foo']) {
|
| 74 | echo $i $item
|
| 75 | }
|
| 76 | ## status: 2
|
| 77 |
|
| 78 | #### Expression for loop with index: List
|
| 79 | for i, item in (['spam', 'eggs']) {
|
| 80 | echo "$i $item"
|
| 81 | }
|
| 82 | ## STDOUT:
|
| 83 | 0 spam
|
| 84 | 1 eggs
|
| 85 | ## END
|
| 86 |
|
| 87 | #### Expression for loop with index: Dict (TODO: define dict iter order)
|
| 88 | for key, value in ({name: 'bob', age: 40}) {
|
| 89 | echo "pair $key $value"
|
| 90 | }
|
| 91 | ## STDOUT:
|
| 92 | pair name bob
|
| 93 | pair age 40
|
| 94 | ## END
|
| 95 |
|
| 96 | #### Dict: index key value loop (TODO: define dict iter order)
|
| 97 | for i, key, value in ({name: 'bob', age: 40}) {
|
| 98 | echo "entry $i $key $value"
|
| 99 | }
|
| 100 | ## STDOUT:
|
| 101 | entry 0 name bob
|
| 102 | entry 1 age 40
|
| 103 | ## END
|
| 104 |
|
| 105 |
|
| 106 | #### Equivalent of zip()
|
| 107 |
|
| 108 | var array = :| d e f |
|
| 109 |
|
| 110 | for i, item in a b c {
|
| 111 | echo "$i $item $[array[i]]"
|
| 112 | }
|
| 113 |
|
| 114 | ## STDOUT:
|
| 115 | 0 a d
|
| 116 | 1 b e
|
| 117 | 2 c f
|
| 118 | ## END
|
| 119 |
|
| 120 | #### no_parse_bare_word eliminates confusion
|
| 121 |
|
| 122 | shopt --set no_parse_bare_word
|
| 123 |
|
| 124 | for x in mylist { # THIS FAILS
|
| 125 | echo "BAD $x"
|
| 126 | }
|
| 127 |
|
| 128 | ## status: 2
|
| 129 | ## STDOUT:
|
| 130 | ## END
|
| 131 |
|
| 132 |
|
| 133 | #### Object that's not iterable
|
| 134 |
|
| 135 | echo hi
|
| 136 | for x in (42) {
|
| 137 | echo $x
|
| 138 | }
|
| 139 |
|
| 140 | ## status: 3
|
| 141 | ## STDOUT:
|
| 142 | hi
|
| 143 | ## END
|
| 144 |
|
| 145 | #### YSH for with brace substitution and glob
|
| 146 |
|
| 147 | touch {foo,bar}.py
|
| 148 | for i, file in *.py {README,foo}.md {
|
| 149 | echo "$i $file"
|
| 150 | }
|
| 151 | ## STDOUT:
|
| 152 | 0 bar.py
|
| 153 | 1 foo.py
|
| 154 | 2 README.md
|
| 155 | 3 foo.md
|
| 156 | ## END
|
| 157 |
|
| 158 | #### for x in (io.stdin) {
|
| 159 |
|
| 160 | # to avoid stdin conflict
|
| 161 |
|
| 162 | $[ENV.SH] $[ENV.REPO_ROOT]/spec/testdata/ysh-for-stdin.ysh
|
| 163 |
|
| 164 | ## STDOUT:
|
| 165 | -1-
|
| 166 | -2-
|
| 167 | -3-
|
| 168 |
|
| 169 | 0 1
|
| 170 | 1 2
|
| 171 | 2 3
|
| 172 |
|
| 173 | empty
|
| 174 | done
|
| 175 |
|
| 176 | empty2
|
| 177 | done2
|
| 178 |
|
| 179 | space
|
| 180 | hi
|
| 181 | ## END
|
| 182 |
|
| 183 | #### I/O error in for x in (stdin) {
|
| 184 |
|
| 185 | set +o errexit
|
| 186 |
|
| 187 | # EISDIR - stdin descriptor is dir
|
| 188 | $[ENV.SH] -c 'for x in (io.stdin) { echo $x }' < /
|
| 189 | if test $? -ne 0; then
|
| 190 | echo pass
|
| 191 | fi
|
| 192 |
|
| 193 | ## STDOUT:
|
| 194 | pass
|
| 195 | ## END
|
| 196 |
|
| 197 | #### Append to List in loop extends the loop (matches JS)
|
| 198 |
|
| 199 | # see demo/survey-loop
|
| 200 |
|
| 201 | var mylist = [1,2,3]
|
| 202 | for x in (mylist) {
|
| 203 | if (x === 2) {
|
| 204 | call mylist->append(99)
|
| 205 | }
|
| 206 | echo $x
|
| 207 | }
|
| 208 | ## STDOUT:
|
| 209 | 1
|
| 210 | 2
|
| 211 | 3
|
| 212 | 99
|
| 213 | ## END
|
| 214 |
|
| 215 | #### Remove from List in loop shortens it (matches JS)
|
| 216 |
|
| 217 | # see demo/survey-loop
|
| 218 |
|
| 219 | var mylist = [1,2,3,4]
|
| 220 | for x in (mylist) {
|
| 221 | if (x === 2) {
|
| 222 | call mylist->pop()
|
| 223 | }
|
| 224 | echo $x
|
| 225 | }
|
| 226 | ## STDOUT:
|
| 227 | 1
|
| 228 | 2
|
| 229 | 3
|
| 230 | ## END
|
| 231 |
|
| 232 | #### Adding to Dict in loop does NOT extend the loop (matches JS)
|
| 233 |
|
| 234 | # see demo/survey-loop
|
| 235 |
|
| 236 | var mydict = {"1": null, "2": null, "3": null}
|
| 237 | for x in (mydict) {
|
| 238 | if (x === "2") {
|
| 239 | setvar mydict["99"] = null
|
| 240 | }
|
| 241 | echo $x
|
| 242 | }
|
| 243 | ## STDOUT:
|
| 244 | 1
|
| 245 | 2
|
| 246 | 3
|
| 247 | ## END
|
| 248 |
|
| 249 | #### Removing from Dict in loop does NOT change the loop (does NOT match JS)
|
| 250 |
|
| 251 | # see demo/survey-loop
|
| 252 |
|
| 253 | var mydict = {"1": null, "2": null, "3": null, "4": null}
|
| 254 | for x in (mydict) {
|
| 255 | if (x === "2") {
|
| 256 | call mydict->erase("1")
|
| 257 | call mydict->erase("3")
|
| 258 | }
|
| 259 | echo $x
|
| 260 | }
|
| 261 | ## STDOUT:
|
| 262 | 1
|
| 263 | 2
|
| 264 | 3
|
| 265 | 4
|
| 266 | ## END
|