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len.go
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len.go
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package macros
import (
. "github.com/kocircuit/kocircuit/lang/circuit/eval"
. "github.com/kocircuit/kocircuit/lang/circuit/model"
. "github.com/kocircuit/kocircuit/lang/go/eval"
. "github.com/kocircuit/kocircuit/lang/go/eval/symbol"
. "github.com/kocircuit/kocircuit/lang/go/kit/util"
)
func init() {
RegisterEvalMacro("Len", new(EvalLenMacro))
}
type EvalLenMacro struct{}
func (m EvalLenMacro) MacroID() string { return m.Help() }
func (m EvalLenMacro) Label() string { return "len" }
func (m EvalLenMacro) MacroSheathString() *string { return PtrString("Len") }
func (m EvalLenMacro) Help() string { return "Len" }
func (m EvalLenMacro) Doc() string {
return `Len returns the length of the sequence passed to it.`
}
func (EvalLenMacro) Invoke(span *Span, arg Arg) (returns Return, effect Effect, err error) {
series := arg.(*StructSymbol).LinkField("value", true).LiftToSeries(span)
return BasicInt64Symbol(int64(series.Len())), nil, nil
}