| 1 | ## oils_failures_allowed: 1
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| 2 | ## our_shell: ysh
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| 3 |
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| 4 | # dynamically generate procs
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| 5 |
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| 6 | #### with eval builtin command, in global scope
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| 7 |
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| 8 | for param in a b {
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| 9 | eval """
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| 10 | proc echo_$param(prefix) {
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| 11 | echo \$prefix $param
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| 12 | }
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| 13 | """
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| 14 | }
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| 15 |
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| 16 | echo_a prefix
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| 17 | echo_b prefix
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| 18 |
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| 19 | ## STDOUT:
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| 20 | prefix a
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| 21 | prefix b
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| 22 | ## END
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| 23 |
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| 24 | #### with eval builtin command, in local scope
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| 25 |
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| 26 | proc p {
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| 27 | for param in a b {
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| 28 | eval """
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| 29 | proc echo_$param(prefix) {
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| 30 | echo \$prefix $param
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| 31 | }
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| 32 | """
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| 33 | }
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| 34 |
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| 35 | echo_a prefix
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| 36 | echo_b prefix
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| 37 | }
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| 38 |
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| 39 | p
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| 40 |
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| 41 | echo_a prefix # not available here!
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| 42 |
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| 43 | ## status: 127
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| 44 | ## STDOUT:
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| 45 | prefix a
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| 46 | prefix b
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| 47 | ## END
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| 48 |
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| 49 | #### with parseCommand() then io->eval(), in local scope
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| 50 |
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| 51 | proc p {
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| 52 | var result = {}
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| 53 | for param in a b {
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| 54 | var s = """
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| 55 | proc echo_$param(prefix) {
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| 56 | echo \$prefix $param
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| 57 | }
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| 58 | """
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| 59 | var cmd = parseCommand(s)
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| 60 | call io->eval(cmd)
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| 61 | }
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| 62 |
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| 63 | echo_a prefix
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| 64 | echo_b prefix
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| 65 | }
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| 66 |
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| 67 | p
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| 68 |
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| 69 | echo_a prefix
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| 70 |
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| 71 | ## status: 127
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| 72 | ## STDOUT:
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| 73 | prefix a
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| 74 | prefix b
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| 75 | ## END
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| 76 |
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| 77 | #### with parseCommand() then io->eval(cmd, vars={out_dict: {}})
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| 78 |
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| 79 | # This could take the place of evalToDict()? But evalToDict() is useful in
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| 80 | # Hay?
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| 81 |
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| 82 | func genProcs() {
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| 83 | var vars = {out_dict: {}}
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| 84 | for param in a b {
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| 85 | var s = """
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| 86 | proc echo_$param(prefix) {
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| 87 | echo \$prefix $param
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| 88 | }
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| 89 | setvar out_dict.echo_$param = echo_$param
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| 90 | """
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| 91 | var cmd = parseCommand(s)
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| 92 | call io->eval(cmd, vars=vars)
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| 93 | }
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| 94 | return (vars.out_dict)
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| 95 | }
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| 96 |
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| 97 | var procs = genProcs()
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| 98 |
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| 99 | var my_echo_a = procs.echo_a
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| 100 | var my_echo_b = procs.echo_b
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| 101 |
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| 102 | my_echo_a prefix
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| 103 | my_echo_b prefix
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| 104 |
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| 105 | ## STDOUT:
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| 106 | prefix a
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| 107 | prefix b
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| 108 | ## END
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| 109 |
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| 110 | #### with evalToDict()
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| 111 |
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| 112 | func genProcs() {
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| 113 | var result = {}
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| 114 | for param in a b {
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| 115 | var s = """
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| 116 | # This is defined locally
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| 117 | proc echo_$param(prefix) {
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| 118 | echo \$prefix $param
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| 119 | }
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| 120 | if false {
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| 121 | = echo_$param
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| 122 | var a = 42
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| 123 | pp frame_vars_
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| 124 | }
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| 125 | """
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| 126 | var cmd = parseCommand(s)
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| 127 |
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| 128 | var d = io->evalToDict(cmd)
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| 129 |
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| 130 | # accumulate
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| 131 | setvar result["echo_$param"] = d["echo_$param"]
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| 132 | }
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| 133 | return (result)
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| 134 | }
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| 135 |
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| 136 | var procs = genProcs()
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| 137 |
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| 138 | var my_echo_a = procs.echo_a
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| 139 | var my_echo_b = procs.echo_b
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| 140 |
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| 141 | my_echo_a prefix
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| 142 | my_echo_b prefix
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| 143 |
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| 144 | ## STDOUT:
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| 145 | prefix a
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| 146 | prefix b
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| 147 | ## END
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| 148 |
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| 149 |
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| 150 | #### with runtime REFLECTION via __invoke__ - no parsing
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| 151 |
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| 152 | # self is the first typed arg
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| 153 | proc p (prefix; self) {
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| 154 | echo $prefix $[self.param]
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| 155 | }
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| 156 |
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| 157 | # p is invoked with "self", which has self.param
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| 158 | var methods = Object(null, {__invoke__: p})
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| 159 |
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| 160 | var procs = {}
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| 161 | for param in a b {
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| 162 | setvar procs["echo_$param"] = Object(methods, {param: param})
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| 163 | }
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| 164 |
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| 165 | var my_echo_a = procs.echo_a
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| 166 | var my_echo_b = procs.echo_b
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| 167 |
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| 168 | # Maybe show an error if this is not value.Obj?
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| 169 | my_echo_a prefix
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| 170 | my_echo_b prefix
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| 171 |
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| 172 | ## STDOUT:
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| 173 | prefix a
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| 174 | prefix b
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| 175 | ## END
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