96 lines
1.6 KiB
Go
96 lines
1.6 KiB
Go
package txt
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import (
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"errors"
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"strconv"
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"strings"
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)
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// IsFloat checks if the string represents a floating point number.
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func IsFloat(s string) bool {
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if s == "" {
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return false
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}
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s = strings.TrimSpace(s)
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for _, r := range s {
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if r != '.' && r != ',' && (r < '0' || r > '9') {
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return false
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}
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}
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return true
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}
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// Float converts a string to a 64-bit floating point number or 0 if invalid.
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func Float(s string) float64 {
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if s == "" {
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return 0
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}
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f, err := strconv.ParseFloat(Numeric(s), 64)
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if err != nil {
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return 0
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}
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return f
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}
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// Float32 converts a string to a 32-bit floating point number or 0 if invalid.
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func Float32(s string) float32 {
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return float32(Float(s))
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}
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// FloatRange parses a string as floating point number range and returns an error if it's not a valid range.
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func FloatRange(s string, min, max float64) (start float64, end float64, err error) {
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if s == "" || len(s) > 40 {
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return start, end, errors.New("invalid range")
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}
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valid := false
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p := 0
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v := [][]byte{make([]byte, 0, 20), make([]byte, 0, 20)}
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for i, r := range s {
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if r == 45 {
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if i == 0 || p == 1 {
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v[p] = append(v[p], byte(r))
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} else if p == 0 {
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p = 1
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}
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}
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if r == 46 || r >= 48 && r <= 57 {
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valid = true
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v[p] = append(v[p], byte(r))
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}
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}
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if !valid {
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return start, end, errors.New("invalid range")
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}
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if p == 0 {
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start = Float(string(v[0]))
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end = start
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} else {
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start = Float(string(v[0]))
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end = Float(string(v[1]))
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}
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if start > max {
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start = max
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} else if start < min {
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start = min
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}
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if end > max {
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end = max
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} else if end < min {
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end = min
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}
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return start, end, nil
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}
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