| 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 $param
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| 31 | }
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| 32 | """
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| 33 | }
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| 34 |
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| 35 | echo_a prefix
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| 36 | echo_b prefix
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| 37 | }
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| 38 |
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| 39 | p
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| 40 |
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| 41 | echo_a prefix # not available here!
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| 42 |
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| 43 | ## status: 127
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| 44 | ## STDOUT:
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| 45 | prefix a
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| 46 | prefix b
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| 47 | ## END
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| 48 |
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| 49 | #### with eval builtin command, making them global with names() and setVar()
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| 50 |
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| 51 | func genProcs() {
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| 52 | var result = {}
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| 53 | for param in a b {
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| 54 | eval """
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| 55 | proc echo_$param(prefix) {
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| 56 | echo \$prefix $param
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| 57 | }
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| 58 | """
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| 59 | setvar result["echo_$param"] = getVar("echo_$param")
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| 60 | }
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| 61 |
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| 62 | echo 'local'
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| 63 | echo_a prefix
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| 64 | echo_b prefix
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| 65 | echo
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| 66 |
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| 67 | return (result)
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| 68 | }
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| 69 |
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| 70 | var procs = genProcs()
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| 71 |
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| 72 | # bind to global scope
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| 73 | for name in (procs) {
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| 74 | call setVar("my_$name", procs[name])
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| 75 | }
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| 76 |
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| 77 | echo 'global'
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| 78 | my_echo_a prefix
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| 79 | my_echo_b prefix
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| 80 |
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| 81 | ## STDOUT:
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| 82 | local
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| 83 | prefix a
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| 84 | prefix b
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| 85 |
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| 86 | global
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| 87 | prefix a
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| 88 | prefix b
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| 89 | ## END
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| 90 |
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| 91 | #### with parseCommand() then io->eval(), in local scope
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| 92 |
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| 93 | proc p {
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| 94 | var result = {}
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| 95 | for param in a b {
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| 96 | var s = """
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| 97 | proc echo_$param(prefix) {
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| 98 | echo \$prefix $param
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| 99 | }
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| 100 | """
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| 101 | var cmd = parseCommand(s)
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| 102 | #pp test_ (cmd)
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| 103 | pp asdl_ (cmd)
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| 104 |
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| 105 | # Oh so then echo_a is defined in the front frame
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| 106 | # And then the front frame is discarded?
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| 107 | #
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| 108 | # OK I see
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| 109 | #
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| 110 | # So you only use evalToDict()?
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| 111 | #
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| 112 | # Or parseCommand() returns something UNBOUND, so it has the same power
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| 113 | # as eval $mystr
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| 114 |
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| 115 | call io->eval(cmd)
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| 116 |
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| 117 | #call io->evalToDict(cmd)
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| 118 | #pp (echo_a)
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| 119 | echo_a zz
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| 120 | }
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| 121 |
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| 122 | echo_a prefix
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| 123 | echo_b prefix
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| 124 | }
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| 125 |
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| 126 | p
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| 127 |
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| 128 | echo_a not_defined
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| 129 |
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| 130 | ## status: 127
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| 131 | ## STDOUT:
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| 132 | prefix a
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| 133 | prefix b
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| 134 | ## END
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| 135 |
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| 136 | #### with parseCommand() then io->eval(cmd, vars={out_dict: {}})
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| 137 |
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| 138 | # This could take the place of evalToDict()? But evalToDict() is useful in
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| 139 | # Hay?
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| 140 |
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| 141 | func genProcs() {
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| 142 | var vars = {out_dict: {}}
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| 143 | for param in a b {
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| 144 | var s = """
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| 145 | proc echo_$param(prefix) {
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| 146 | echo \$prefix $param
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| 147 | }
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| 148 | setvar out_dict.echo_$param = echo_$param
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| 149 | """
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| 150 | var cmd = parseCommand(s)
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| 151 | call io->eval(cmd, vars=vars)
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| 152 | }
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| 153 | return (vars.out_dict)
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| 154 | }
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| 155 |
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| 156 | var procs = genProcs()
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| 157 |
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| 158 | var my_echo_a = procs.echo_a
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| 159 | var my_echo_b = procs.echo_b
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| 160 |
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| 161 | my_echo_a prefix
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| 162 | my_echo_b prefix
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| 163 |
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| 164 | ## STDOUT:
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| 165 | prefix a
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| 166 | prefix b
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| 167 | ## END
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| 168 |
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| 169 | #### with evalToDict()
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| 170 |
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| 171 | func genProcs() {
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| 172 | var result = {}
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| 173 | for param in a b {
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| 174 | var s = """
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| 175 | # This is defined locally
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| 176 | proc echo_$param(prefix) {
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| 177 | echo \$prefix $param
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| 178 | }
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| 179 | if false {
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| 180 | = echo_$param
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| 181 | var a = 42
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| 182 | pp frame_vars_
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| 183 | }
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| 184 | """
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| 185 | var cmd = parseCommand(s)
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| 186 |
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| 187 | var d = io->evalToDict(cmd)
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| 188 |
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| 189 | # accumulate
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| 190 | setvar result["echo_$param"] = d["echo_$param"]
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| 191 | }
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| 192 | return (result)
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| 193 | }
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| 194 |
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| 195 | var procs = genProcs()
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| 196 |
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| 197 | var my_echo_a = procs.echo_a
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| 198 | var my_echo_b = procs.echo_b
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| 199 |
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| 200 | my_echo_a prefix
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| 201 | my_echo_b prefix
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| 202 |
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| 203 | ## STDOUT:
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| 204 | prefix a
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| 205 | prefix b
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| 206 | ## END
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| 207 |
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| 208 |
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| 209 | #### with runtime REFLECTION via __invoke__ - no parsing
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| 210 |
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| 211 | # self is the first typed arg
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| 212 | proc p (prefix; self) {
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| 213 | echo $prefix $[self.param]
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| 214 | }
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| 215 |
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| 216 | # p is invoked with "self", which has self.param
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| 217 | var methods = Object(null, {__invoke__: p})
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| 218 |
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| 219 | var procs = {}
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| 220 | for param in a b {
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| 221 | setvar procs["echo_$param"] = Object(methods, {param: param})
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| 222 | }
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| 223 |
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| 224 | var my_echo_a = procs.echo_a
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| 225 | var my_echo_b = procs.echo_b
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| 226 |
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| 227 | if false {
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| 228 | = my_echo_a
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| 229 | = my_echo_b
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| 230 | type -t my_echo_a
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| 231 | type -t my_echo_b
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| 232 | }
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| 233 |
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| 234 | # Maybe show an error if this is not value.Obj?
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| 235 | my_echo_a prefix
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| 236 | my_echo_b prefix
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| 237 |
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| 238 | ## STDOUT:
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| 239 | prefix a
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| 240 | prefix b
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| 241 | ## END
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