/
dsl.go
57 lines (44 loc) · 1.21 KB
/
dsl.go
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package querysql
import (
"fmt"
"strings"
)
func ParseJoinOn(dsl string, r PkgPathResolver) (JoinOn, error) {
parts := strings.Split(dsl, "=")
if len(parts) != 2 {
return JoinOn{}, fmt.Errorf("invalid joind %s, need `<PkgName>.<Export>#<FieldName> = <PkgName>.<Export2>#<FieldName>`", dsl)
}
return JoinOn{}, nil
}
type JoinOn [2]*ModelField
type PkgPathResolver = func(localName string) string
func ParseModelField(dsl string, r PkgPathResolver) (*ModelField, error) {
modelField := strings.Split(dsl, "#")
if len(modelField) != 2 {
return nil, fmt.Errorf("invalid where def %s, need `<PkgName>.<Export>#<FieldName>`", dsl)
}
name, localName := exportedName(modelField[0])
pkgPath := r(localName)
if pkgPath == "" {
return nil, fmt.Errorf("invalid where def %s, need `<PkgName>.<Export>#<FieldName>`", dsl)
}
wm := &ModelField{
PkgPath: pkgPath,
Name: name,
FieldName: modelField[1],
}
return wm, nil
}
type ModelField struct {
PkgPath string
Name string
FieldName string
}
func exportedName(s string) (name string, pkgNameOrPkgPath string) {
parts := strings.Split(s, ".")
n := len(parts)
if n == 0 {
return name, ""
}
return parts[n-1], strings.Join(parts[0:n-1], ".")
}