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tomap.go
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/
tomap.go
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package lib
import (
"errors"
"fmt"
"github.com/dcaiafa/nitro"
)
var errToMapUsage = errors.New(
`invalid usage. Expected to_map(iter, func)`)
func toMap(m *nitro.VM, args []nitro.Value, nret int) ([]nitro.Value, error) {
if len(args) != 2 {
return nil, errToMapUsage
}
iter, err := nitro.MakeIterator(m, args[0])
if err != nil {
return nil, errToMapUsage
}
fn, ok := args[1].(nitro.Callable)
if !ok {
return nil, errToMapUsage
}
mapv := nitro.NewObject()
for {
v, err := m.IterNext(iter, 1)
if err != nil {
return nil, err
}
if v == nil {
break
}
res, err := m.Call(fn, []nitro.Value{v[0]}, 1)
if err != nil {
return nil, err
}
larg, ok := res[0].(*nitro.Array)
if !ok {
return nil, fmt.Errorf(
"conversion func must return a list; instead it returned %v",
nitro.TypeName(res[0]))
}
if larg.Len() != 2 {
return nil, fmt.Errorf(
"conversion func must return a list with 2 elements (key and value); "+
"instead it returned a list with %v elements",
larg.Len())
}
mapv.Put(larg.Get(0), larg.Get(1))
}
return []nitro.Value{mapv}, nil
}