84 lines
1.6 KiB
Go
84 lines
1.6 KiB
Go
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package simql
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import (
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"fmt"
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"regexp"
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"strings"
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)
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var selectTableRegexp = regexp.MustCompile("^(from|left join|inner join|right join) ([^ ]+)( (as) ([^ ]+))?( (on) ([^ ]+) (=|!=|>|>=|<|<=) ([^ ]+)( (and) ([^ ]+) (=|!=|>|>=|<|<=) ([^ ]+))*)?$")
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type SelectTable string
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func (t SelectTable) IsValid() bool {
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return selectTableRegexp.MatchString(string(t))
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}
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func (t SelectTable) Parse() (selectType, table, as string, on *OnClause, ok bool) {
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if selectTableRegexp.MatchString(string(t)) {
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ok = true
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result := selectTableRegexp.FindAllStringSubmatch(string(t), -1)
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for i, r := range result {
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// for j, c := range r {
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// fmt.Println(i, j, c)
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// }
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if i == 0 {
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selectType, table = r[1], r[2]
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if r[4] == "as" {
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as = r[5]
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}
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if r[7] == "on" {
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on = On(r[8], r[9], r[10])
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}
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}
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if r[12] == "and" {
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on.And(r[13], r[14], r[15])
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}
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}
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}
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return
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}
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func (t SelectTable) String() string {
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return string(t)
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}
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func From(def string) SelectTable {
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if strings.Index(def, "from ") == 0 {
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return SelectTable(def)
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}
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return SelectTable(fmt.Sprintf("from %s", def))
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}
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func InnerJoin(def string) SelectTable {
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if strings.Index(def, "inner join ") == 0 {
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return SelectTable(def)
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}
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return SelectTable(fmt.Sprintf("inner join %s", def))
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}
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func LeftJoin(def string) SelectTable {
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if strings.Index(def, "left join ") == 0 {
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return SelectTable(def)
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}
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return SelectTable(fmt.Sprintf("left join %s", def))
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}
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func RightJoin(def string) SelectTable {
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if strings.Index(def, "right join ") == 0 {
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return SelectTable(def)
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}
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return SelectTable(fmt.Sprintf("right join %s", def))
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}
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