53 lines
1016 B
Go
53 lines
1016 B
Go
package builtin
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import (
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"strconv"
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"git.xdrm.io/go/aicra/typecheck"
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)
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// Float64 checks if a value is a float64
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type Float64 struct{}
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// NewFloat64 returns a bare number type checker
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func NewFloat64() *Float64 {
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return &Float64{}
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}
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// Checker returns the checker function
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func (Float64) Checker(typeName string) typecheck.CheckerFunc {
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// nothing if type not handled
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if typeName != "float64" && typeName != "float" {
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return nil
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}
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return func(value interface{}) bool {
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_, isFloat := readFloat(value)
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return isFloat
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}
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}
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// readFloat tries to read a serialized float and returns whether it succeeded.
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func readFloat(value interface{}) (float64, bool) {
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switch cast := value.(type) {
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case int:
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return float64(cast), true
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case uint:
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return float64(cast), true
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case float64:
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return cast, true
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// serialized string -> try to convert to float
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case string:
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floatVal, err := strconv.ParseFloat(cast, 64)
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return floatVal, err == nil
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// unknown type
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default:
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return 0, false
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}
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}
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