| 1 | ## our_shell: ysh
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| 2 |
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| 3 | # dynamically generate procs
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| 4 |
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| 5 | #### with eval builtin command, in global scope
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| 6 |
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| 7 | for param in a b {
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| 8 | eval """
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| 9 | proc echo_$param(prefix) {
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| 10 | echo \$prefix $param
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| 11 | }
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| 12 | """
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| 13 | # We need to "escape" the for loop scope
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| 14 | call setVar("echo_$param", getVar("echo_$param"), global=true)
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| 15 | }
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| 16 |
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| 17 | echo_a prefix
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| 18 | echo_b prefix
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| 19 |
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| 20 | ## STDOUT:
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| 21 | prefix a
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| 22 | prefix b
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| 23 | ## END
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| 24 |
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| 25 | #### with eval builtin command, in local scope
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| 26 |
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| 27 | proc p {
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| 28 | for param in a b {
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| 29 | eval """
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| 30 | proc echo_$param(prefix) {
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| 31 | echo \$prefix $param
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| 32 | }
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| 33 | """
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| 34 | # We need to "escape" the for loop scope
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| 35 | call setVar("echo_$param", getVar("echo_$param"), global=true)
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| 36 | }
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| 37 |
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| 38 | # calling globals
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| 39 | echo_a prefix
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| 40 | echo_b prefix
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| 41 | }
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| 42 |
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| 43 | p
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| 44 |
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| 45 | # the global is available
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| 46 | echo_a prefix
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| 47 |
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| 48 | ## STDOUT:
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| 49 | prefix a
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| 50 | prefix b
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| 51 | prefix a
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| 52 | ## END
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| 53 |
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| 54 | #### with eval builtin command, reeturning Dict
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| 55 |
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| 56 | func genProcs() {
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| 57 | var result = {}
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| 58 | for param in a b {
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| 59 | eval """
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| 60 | proc echo_$param(prefix) {
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| 61 | echo \$prefix $param
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| 62 | }
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| 63 | """
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| 64 | setvar result["echo_$param"] = getVar("echo_$param")
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| 65 | }
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| 66 | return (result)
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| 67 | }
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| 68 |
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| 69 | var procs = genProcs()
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| 70 |
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| 71 | # bind to global scope
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| 72 | for name in (procs) {
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| 73 | call setVar("my_$name", procs[name], global=true)
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| 74 | }
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| 75 |
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| 76 | my_echo_a prefix
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| 77 | my_echo_b prefix
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| 78 |
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| 79 | ## STDOUT:
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| 80 | prefix a
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| 81 | prefix b
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| 82 | ## END
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| 83 |
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| 84 | #### with parseCommand() then io->eval(), in local scope
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| 85 |
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| 86 | proc p {
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| 87 | var result = {}
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| 88 | for param in a b {
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| 89 | var s = """
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| 90 | proc echo_$param (prefix) {
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| 91 | echo \$prefix $param
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| 92 | }
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| 93 | """
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| 94 | var cmd = parseCommand(s)
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| 95 | #pp test_ (cmd)
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| 96 | #pp asdl_ (cmd)
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| 97 |
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| 98 | # note: this creates its own frame, unlike 'eval'
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| 99 | # call io->eval(cmd)
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| 100 |
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| 101 | var d = io->eval(cmd, to_dict=true)
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| 102 |
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| 103 | # bind my_echo_a globally
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| 104 | call setVar("my_echo_$param", d["echo_$param"], global=true)
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| 105 | }
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| 106 |
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| 107 | #= dict(vm.getFrame(0))
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| 108 |
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| 109 | my_echo_a in-proc
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| 110 | my_echo_b in-proc
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| 111 | }
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| 112 |
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| 113 | p
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| 114 |
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| 115 | my_echo_a global
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| 116 | my_echo_b global
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| 117 |
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| 118 | ## STDOUT:
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| 119 | in-proc a
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| 120 | in-proc b
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| 121 | global a
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| 122 | global b
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| 123 | ## END
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| 124 |
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| 125 | #### with parseCommand() then io->eval(cmd, vars={out_dict: {}})
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| 126 |
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| 127 | # This could take the place of evalToDict()? But evalToDict() is useful in
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| 128 | # Hay?
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| 129 |
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| 130 | func genProcs() {
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| 131 | var vars = {out_dict: {}}
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| 132 | for param in a b {
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| 133 | var s = """
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| 134 | proc echo_$param(prefix) {
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| 135 | echo \$prefix $param
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| 136 | }
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| 137 | setvar out_dict.echo_$param = echo_$param
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| 138 | """
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| 139 | var cmd = parseCommand(s)
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| 140 | call io->eval(cmd, vars=vars)
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| 141 | }
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| 142 | return (vars.out_dict)
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| 143 | }
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| 144 |
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| 145 | var procs = genProcs()
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| 146 |
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| 147 | var my_echo_a = procs.echo_a
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| 148 | var my_echo_b = procs.echo_b
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| 149 |
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| 150 | my_echo_a prefix
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| 151 | my_echo_b prefix
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| 152 |
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| 153 | ## STDOUT:
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| 154 | prefix a
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| 155 | prefix b
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| 156 | ## END
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| 157 |
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| 158 | #### with evalToDict()
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| 159 |
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| 160 | func genProcs() {
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| 161 | var result = {}
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| 162 | for param in a b {
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| 163 | var s = """
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| 164 | # This is defined locally
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| 165 | proc echo_$param(prefix) {
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| 166 | echo \$prefix $param
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| 167 | }
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| 168 | if false {
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| 169 | = echo_$param
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| 170 | var a = 42
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| 171 | pp frame_vars_
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| 172 | }
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| 173 | """
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| 174 | var cmd = parseCommand(s)
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| 175 |
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| 176 | var d = io->evalToDict(cmd)
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| 177 |
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| 178 | # accumulate
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| 179 | setvar result["echo_$param"] = d["echo_$param"]
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| 180 | }
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| 181 | return (result)
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| 182 | }
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| 183 |
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| 184 | var procs = genProcs()
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| 185 |
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| 186 | var my_echo_a = procs.echo_a
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| 187 | var my_echo_b = procs.echo_b
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| 188 |
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| 189 | my_echo_a prefix
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| 190 | my_echo_b prefix
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| 191 |
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| 192 | ## STDOUT:
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| 193 | prefix a
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| 194 | prefix b
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| 195 | ## END
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| 196 |
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| 197 |
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| 198 | #### with runtime REFLECTION via __invoke__ - no parsing
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| 199 |
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| 200 | # self is the first typed arg
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| 201 | proc p (prefix; self) {
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| 202 | echo $prefix $[self.param]
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| 203 | }
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| 204 |
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| 205 | # p is invoked with "self", which has self.param
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| 206 | var methods = Object(null, {__invoke__: p})
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| 207 |
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| 208 | var procs = {}
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| 209 | for param in a b {
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| 210 | setvar procs["echo_$param"] = Object(methods, {param: param})
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| 211 | }
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| 212 |
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| 213 | var my_echo_a = procs.echo_a
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| 214 | var my_echo_b = procs.echo_b
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| 215 |
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| 216 | if false {
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| 217 | = my_echo_a
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| 218 | = my_echo_b
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| 219 | type -t my_echo_a
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| 220 | type -t my_echo_b
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| 221 | }
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| 222 |
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| 223 | # Maybe show an error if this is not value.Obj?
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| 224 | my_echo_a prefix
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| 225 | my_echo_b prefix
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| 226 |
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| 227 | ## STDOUT:
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| 228 | prefix a
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| 229 | prefix b
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| 230 | ## END
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