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Add new builtin "unpack"

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This commit is contained in:
Cheer Xiao 2015-01-21 18:21:02 +01:00
parent e143c65087
commit 067c8ac75e
1 changed files with 18 additions and 0 deletions
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18
eval/builtin-func.go
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@ -25,6 +25,7 @@ var builtinFuncs = map[string]builtinFunc{
"println": builtinFunc{println, [2]StreamType{0, fdStream}},
"printchan": builtinFunc{printchan, [2]StreamType{chanStream, fdStream}},
"feedchan": builtinFunc{feedchan, [2]StreamType{fdStream, chanStream}},
"unpack": builtinFunc{unpack, [2]StreamType{0, chanStream}},
"cd": builtinFunc{cd, [2]StreamType{}},
"+": builtinFunc{plus, [2]StreamType{0, chanStream}},
"-": builtinFunc{minus, [2]StreamType{0, chanStream}},
@ -98,6 +99,23 @@ func feedchan(ev *Evaluator, args []Value) string {
}
}
// unpack takes any number of tables and output their list elements
func unpack(ev *Evaluator, args []Value) string {
out := ev.ports[1].ch
for _, a := range args {
if _, ok := a.(*Table); !ok {
return "args error"
}
}
for _, a := range args {
a := a.(*Table)
for _, e := range a.List {
out <- e
}
}
return ""
}
func cd(ev *Evaluator, args []Value) string {
var dir string
if len(args) == 0 {