// (( A | B | C ) & D ) | E & (( F | G ) & H )

import "strings"// 實例化一個搜索表達式
func NewTermQuery(field, keyword string) *TermQuery {return &TermQuery{Keyword: &Keyword{Field: field, Word: keyword},}
}func (tq *TermQuery) Empty() bool {return tq.Keyword == nil && len(tq.Must) == 0 && len(tq.Should) == 0
}func (tq *TermQuery) And(queries ...*TermQuery) *TermQuery {if len(queries) == 0 {return tq}array := make([]*TermQuery, 0, len(queries)+1)if !tq.Empty() {array = append(array, tq)}for _, ele := range queries {if !ele.Empty() {array = append(array, ele)}}if len(array) == 0 {return tq}return &TermQuery{Must: array}
}func (tq *TermQuery) Or(queries ...*TermQuery) *TermQuery {if len(queries) == 0 {return tq}array := make([]*TermQuery, 0, 1+len(queries))if !tq.Empty() {array = append(array, tq)}for _, ele := range queries {if !ele.Empty() {array = append(array, ele)}}if len(array) == 0 {return tq}return &TermQuery{Should: array}
}func (tq *TermQuery) Tostring() string {switch {case tq.Keyword != nil:return tq.Keyword.ToString()case len(tq.Must) > 0:if len(tq.Must) == 1 {return tq.Must[0].Tostring()}sb := strings.Builder{}sb.WriteString("(")for _, ele := range tq.Must {s := ele.Tostring()if len(s) > 0 {sb.WriteString(s)sb.WriteString("&")}}s := sb.String()s = s[0:len(s)-1] + ")"return scase len(tq.Should) > 0:if len(tq.Should) == 1 {return tq.Should[0].Tostring()}sb := strings.Builder{}sb.WriteByte('(')for _, ele := range tq.Should {s := ele.Tostring()if len(s) > 0 {sb.WriteString(s)sb.WriteByte('|')}}s := sb.String()s = s[0:len(s)-1] + ")"return s}return ""
}

package typesimport ("strings"
)func NewTermQuery(field, keyword string) *TermQuery {//TermQuery的一級成員里只有 Field-keyword非空，Must和Should都為空return &TermQuery{Keyword: &Keyword{Field: field, Word: keyword}}
}func (tq TermQuery) Empty() bool {return tq.Keyword == nil && len(tq.Must) == 0 && len(tq.Should) == 0
}// Builder模式
func (tq *TermQuery) And(querys ...*TermQuery) *TermQuery {if len(querys) == 0 {return tq}array := make([]*TermQuery, 0, len(querys)+1)if !tq.Empty() {array = append(array, tq)}for _, query := range querys {if !query.Empty() {array = append(array, query)}}return &TermQuery{Must: array}
}func (tq *TermQuery) Or(querys ...*TermQuery) *TermQuery {if len(querys) == 0 {return tq}array := make([]*TermQuery, 0, len(querys)+1)if !tq.Empty() {array = append(array, tq)}for _, query := range querys {if !query.Empty() {array = append(array, query)}}return &TermQuery{Should: array}
}func (tq TermQuery) ToString() string {if tq.Keyword != nil {return tq.Keyword.ToString()} else if len(tq.Must) > 0 {if len(tq.Must) == 1 {return tq.Must[0].ToString()} else {sb := strings.Builder{}sb.WriteByte('(')for _, e := range tq.Must {s := e.ToString()if len(s) > 0 {sb.WriteString(s)sb.WriteByte('&')}}s := sb.String()s = s[0:len(s)-1] + ")"return s}} else if len(tq.Should) > 0 {if len(tq.Should) == 1 {return tq.Should[0].ToString()} else {sb := strings.Builder{}sb.WriteByte('(')for _, e := range tq.Should {s := e.ToString()if len(s) > 0 {sb.WriteString(s)sb.WriteByte('|')}}s := sb.String()s = s[0:len(s)-1] + ")"return s}}return ""
}