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package part
import (
"strings"
)
type String string
func NewString(s string) String {
return String(s)
}
func (s String) Compare(other Part) int {
if other == nil {
return 1
} else if s == other {
return 0
}
switch o := other.(type) {
case Uint64:
return 1
case String:
return strings.Compare(string(s), string(o))
case PreString:
return strings.Compare(string(s), string(o))
case Any:
return 0
case Empty:
if o.IsAny() {
return 0
}
return s.Compare(Uint64(0))
}
return 0
}
func (s String) IsNull() bool {
return s == ""
}
func (s String) IsAny() bool {
return false
}
func (s String) IsEmpty() bool {
return false
}
// PreString is less than the number
// e.g. a < 1
type PreString string
func NewPreString(s string) PreString {
return PreString(s)
}
func (s PreString) Compare(other Part) int {
if other == nil {
return 1
} else if s == other {
return 0
}
switch o := other.(type) {
case Uint64:
return -1
case String:
return strings.Compare(string(s), string(o))
case PreString:
return strings.Compare(string(s), string(o))
case Any:
return 0
case Empty:
if o.IsAny() {
return 0
}
return s.Compare(Uint64(0))
}
return 0
}
func (s PreString) IsNull() bool {
return s == ""
}
func (s PreString) IsAny() bool {
return false
}
func (s PreString) IsEmpty() bool {
return false
}
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