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