114 lines
1.8 KiB
Go
114 lines
1.8 KiB
Go
package list
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import (
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"fmt"
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"strings"
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)
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// KeyValue represents a key-value attribute.
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type KeyValue struct {
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Key string
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Value string
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}
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// ParseKeyValue creates a new key-value attribute from a string.
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func ParseKeyValue(s string) *KeyValue {
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f := KeyValue{}
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return f.Parse(s)
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}
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// Key returns the sanitized attribute key.
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func Key(s string) string {
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var i = 0
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// Remove non-alphanumeric characters.
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result := strings.Map(func(r rune) rune {
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switch r {
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case '.', '@', '-', '+', '_', '#':
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return r
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case '*':
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i++
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return r
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}
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if r >= '0' && r <= '9' {
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return r
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} else if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') || r == 127 {
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return -1
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}
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i++
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return r
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}, s)
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if i == 0 {
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return ""
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}
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return result
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}
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// Value returns the sanitized attribute value.
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func Value(s string) string {
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// Remove control characters.
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return strings.Map(func(r rune) rune {
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if r <= 32 || r == 127 {
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return -1
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}
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switch r {
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case '(', ')', '<', '>', '\'', '"', '*':
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return r
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}
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return r
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}, s)
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}
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// Parse parses a string attribute into key and value.
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func (f *KeyValue) Parse(s string) *KeyValue {
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k, v, _ := strings.Cut(s, ":")
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// Set key.
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if k = Key(k); k == "" {
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return nil
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} else {
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f.Key = k
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}
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// Default?
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if f.Key == All {
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return f
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} else if v = Value(v); v == "" {
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f.Value = True
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return f
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}
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// Set value.
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if b := Bool[strings.ToLower(v)]; b != "" {
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f.Value = b
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} else {
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f.Value = v
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}
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return f
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}
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// String return the attribute as string.
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func (f *KeyValue) String() string {
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if f == nil {
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return ""
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}
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if f.Key == All {
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return All
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}
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if Bool[strings.ToLower(f.Value)] == True {
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return f.Key
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}
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if s := fmt.Sprintf("%s:%s", f.Key, f.Value); len(s) < StringLengthLimit {
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return s
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}
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return ""
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}
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