34 lines
679 B
Go
34 lines
679 B
Go
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package vm
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import (
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"fmt"
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"github.com/mediocregopher/ginger/gg"
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)
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// GlobalScope contains operations and values which are available from within
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// any operation in a ginger program.
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var GlobalScope = ScopeMap{
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"add": Value{Operation: preEvalValOp(func(val Value) (Value, error) {
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if len(val.Tuple) == 0 {
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return Value{}, fmt.Errorf("add requires a non-zero tuple of numbers as an argument")
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}
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var sum int64
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for _, tupVal := range val.Tuple {
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if tupVal.Number == nil {
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return Value{}, fmt.Errorf("add requires a non-zero tuple of numbers as an argument")
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}
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sum += *tupVal.Number
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}
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return Value{Value: gg.Value{Number: &sum}}, nil
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})},
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}
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