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