| 1 | # YSH specific features of eval
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| 2 |
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| 3 | ## our_shell: ysh
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| 4 | ## oils_failures_allowed: 1
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| 5 |
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| 6 | #### Eval a command literal
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| 7 |
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| 8 | var b = ^(echo obj)
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| 9 | eval (b)
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| 10 |
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| 11 | eval (^(echo command literal))
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| 12 |
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| 13 | eval { echo block }
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| 14 |
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| 15 | ## STDOUT:
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| 16 | obj
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| 17 | command literal
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| 18 | block
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| 19 | ## END
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| 20 |
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| 21 |
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| 22 | #### Eval a block within a proc
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| 23 | proc run (;;; block) {
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| 24 | eval (block)
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| 25 | }
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| 26 |
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| 27 | run {
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| 28 | echo 'In a block!'
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| 29 | }
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| 30 | ## STDOUT:
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| 31 | In a block!
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| 32 | ## END
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| 33 |
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| 34 | #### Eval block created by calling a proc
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| 35 | proc lazy-block ( ; out; ; block) {
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| 36 | call out->setValue(block)
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| 37 | }
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| 38 |
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| 39 | var myglobal = 0
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| 40 |
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| 41 | lazy-block (&my_block) {
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| 42 | json write (myglobal)
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| 43 | }
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| 44 |
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| 45 | eval (my_block)
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| 46 | setvar myglobal = 1
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| 47 | eval (my_block)
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| 48 | ## STDOUT:
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| 49 | 0
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| 50 | 1
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| 51 | ## END
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| 52 |
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| 53 | #### eval (block) can read variables like eval ''
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| 54 |
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| 55 | proc p2(code_str) {
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| 56 | var mylocal = 42
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| 57 | eval $code_str
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| 58 | }
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| 59 |
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| 60 | p2 'echo mylocal=$mylocal'
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| 61 |
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| 62 | proc p (;;; block) {
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| 63 | var mylocal = 99
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| 64 | eval (block)
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| 65 | }
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| 66 |
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| 67 | p {
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| 68 | echo mylocal=$mylocal
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| 69 | }
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| 70 |
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| 71 |
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| 72 | ## STDOUT:
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| 73 | mylocal=42
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| 74 | mylocal=99
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| 75 | ## END
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| 76 |
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| 77 | #### eval should have a sandboxed mode
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| 78 |
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| 79 | proc p (;;; block) {
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| 80 | var this = 42
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| 81 |
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| 82 | # like push-registers? Not sure
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| 83 | # We could use state.ctx_Temp ? There's also ctx_FuncCall etc.
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| 84 | #
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| 85 | # I think we want to provide full control over the stack.
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| 86 | push-frame {
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| 87 | eval (block)
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| 88 | }
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| 89 | }
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| 90 |
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| 91 | p {
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| 92 | echo $this
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| 93 | }
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| 94 |
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| 95 | ## status: 1
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| 96 | ## STDOUT:
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| 97 | TODO
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| 98 | ## END
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