72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package intfns
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import (
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"fmt"
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"math"
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"github.com/ChrisTrenkamp/goxpath/tree"
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)
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func number(c tree.Ctx, args ...tree.Result) (tree.Result, error) {
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if b, ok := args[0].(tree.IsNum); ok {
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return b.Num(), nil
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}
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return nil, fmt.Errorf("Cannot convert object to a number")
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}
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func sum(c tree.Ctx, args ...tree.Result) (tree.Result, error) {
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n, ok := args[0].(tree.NodeSet)
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if !ok {
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return nil, fmt.Errorf("Cannot convert object to a node-set")
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}
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ret := 0.0
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for _, i := range n {
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ret += float64(tree.GetNodeNum(i))
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}
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return tree.Num(ret), nil
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}
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func floor(c tree.Ctx, args ...tree.Result) (tree.Result, error) {
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n, ok := args[0].(tree.IsNum)
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if !ok {
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return nil, fmt.Errorf("Cannot convert object to a number")
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}
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return tree.Num(math.Floor(float64(n.Num()))), nil
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}
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func ceiling(c tree.Ctx, args ...tree.Result) (tree.Result, error) {
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n, ok := args[0].(tree.IsNum)
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if !ok {
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return nil, fmt.Errorf("Cannot convert object to a number")
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}
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return tree.Num(math.Ceil(float64(n.Num()))), nil
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}
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func round(c tree.Ctx, args ...tree.Result) (tree.Result, error) {
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isn, ok := args[0].(tree.IsNum)
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if !ok {
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return nil, fmt.Errorf("Cannot convert object to a number")
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}
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n := isn.Num()
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if math.IsNaN(float64(n)) || math.IsInf(float64(n), 0) {
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return n, nil
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}
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if n < -0.5 {
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n = tree.Num(int(n - 0.5))
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} else if n > 0.5 {
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n = tree.Num(int(n + 0.5))
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} else {
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n = 0
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}
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return n, nil
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}
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