initial commit

table.go

@@ -0,0 +1,83 @@
+package simql
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+var selectTableRegexp = regexp.MustCompile("^(from|left join|inner join|right join) ([^ ]+)( (as) ([^ ]+))?( (on) ([^ ]+) (=|!=|>|>=|<|<=) ([^ ]+)( (and) ([^ ]+) (=|!=|>|>=|<|<=) ([^ ]+))*)?$")
+
+type SelectTable string
+
+func (t SelectTable) IsValid() bool {
+	return selectTableRegexp.MatchString(string(t))
+}
+
+func (t SelectTable) Parse() (selectType, table, as string, on *OnClause, ok bool) {
+	if selectTableRegexp.MatchString(string(t)) {
+		ok = true
+
+		result := selectTableRegexp.FindAllStringSubmatch(string(t), -1)
+
+		for i, r := range result {
+			// for j, c := range r {
+			// 	fmt.Println(i, j, c)
+			// }
+
+			if i == 0 {
+				selectType, table = r[1], r[2]
+
+				if r[4] == "as" {
+					as = r[5]
+				}
+
+				if r[7] == "on" {
+					on = On(r[8], r[9], r[10])
+				}
+			}
+
+			if r[12] == "and" {
+				on.And(r[13], r[14], r[15])
+			}
+		}
+	}
+
+	return
+}
+
+func (t SelectTable) String() string {
+	return string(t)
+}
+
+func From(def string) SelectTable {
+	if strings.Index(def, "from ") == 0 {
+		return SelectTable(def)
+	}
+
+	return SelectTable(fmt.Sprintf("from %s", def))
+}
+
+func InnerJoin(def string) SelectTable {
+	if strings.Index(def, "inner join ") == 0 {
+		return SelectTable(def)
+	}
+
+	return SelectTable(fmt.Sprintf("inner join %s", def))
+}
+
+func LeftJoin(def string) SelectTable {
+	if strings.Index(def, "left join ") == 0 {
+		return SelectTable(def)
+	}
+
+	return SelectTable(fmt.Sprintf("left join %s", def))
+}
+
+func RightJoin(def string) SelectTable {
+	if strings.Index(def, "right join ") == 0 {
+		return SelectTable(def)
+	}
+
+	return SelectTable(fmt.Sprintf("right join %s", def))
+}