2019-03-24 14:57:29 +01:00
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package qcode
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import (
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"fmt"
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"regexp"
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"strings"
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"github.com/dosco/super-graph/util"
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2019-03-25 05:43:14 +01:00
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"github.com/gobuffalo/flect"
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2019-03-24 14:57:29 +01:00
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)
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type QCode struct {
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Query *Query
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}
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type Query struct {
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Select *Select
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}
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type Column struct {
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Table string
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Name string
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FieldName string
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}
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type Select struct {
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ID int32
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AsList bool
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Table string
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Singular string
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FieldName string
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Cols []*Column
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Where *Exp
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OrderBy []*OrderBy
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DistinctOn []string
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Paging Paging
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Joins []*Select
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}
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type Exp struct {
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Op ExpOp
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Col string
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NestedCol bool
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Type ValType
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Val string
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ListType ValType
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ListVal []string
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Children []*Exp
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}
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type OrderBy struct {
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Col string
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Order Order
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}
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type Paging struct {
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Limit string
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Offset string
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}
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type ExpOp int
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const (
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OpAnd ExpOp = iota + 1
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OpOr
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OpNot
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OpEquals
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OpNotEquals
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OpGreaterOrEquals
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OpLesserOrEquals
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OpGreaterThan
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OpLesserThan
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OpIn
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OpNotIn
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OpLike
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OpNotLike
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OpILike
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OpNotILike
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OpSimilar
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OpNotSimilar
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OpContains
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OpContainedIn
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OpHasKey
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OpHasKeyAny
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OpHasKeyAll
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OpIsNull
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)
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2019-03-27 07:58:19 +01:00
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func (t ExpOp) String() string {
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var v string
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switch t {
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case OpAnd:
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v = "op-and"
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case OpOr:
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v = "op-or"
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case OpNot:
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v = "op-not"
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case OpEquals:
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v = "op-equals"
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case OpNotEquals:
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v = "op-not-equals"
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case OpGreaterOrEquals:
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v = "op-greater-or-equals"
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case OpLesserOrEquals:
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v = "op-lesser-or-equals"
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case OpGreaterThan:
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v = "op-greater-than"
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case OpLesserThan:
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v = "op-lesser-than"
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case OpIn:
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v = "op-in"
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case OpNotIn:
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v = "op-not-in"
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case OpLike:
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v = "op-like"
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case OpNotLike:
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v = "op-not-like"
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case OpILike:
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v = "op-i-like"
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case OpNotILike:
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v = "op-not-i-like"
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case OpSimilar:
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v = "op-similar"
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case OpNotSimilar:
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v = "op-not-similar"
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case OpContains:
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v = "op-contains"
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case OpContainedIn:
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v = "op-contained-in"
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case OpHasKey:
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v = "op-has-key"
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case OpHasKeyAny:
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v = "op-has-key-any"
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case OpHasKeyAll:
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v = "op-has-key-all"
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case OpIsNull:
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v = "op-is-null"
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}
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return fmt.Sprintf("<%s>", v)
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}
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2019-03-24 14:57:29 +01:00
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type ValType int
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const (
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ValStr ValType = iota + 1
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ValInt
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ValFloat
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ValBool
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ValList
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ValVar
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2019-03-27 07:58:19 +01:00
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ValNone
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2019-03-24 14:57:29 +01:00
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)
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type AggregrateOp int
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const (
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AgCount AggregrateOp = iota + 1
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AgSum
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AgAvg
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AgMax
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AgMin
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)
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type Order int
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const (
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OrderAsc Order = iota + 1
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OrderDesc
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OrderAscNullsFirst
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OrderAscNullsLast
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OrderDescNullsFirst
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OrderDescNullsLast
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)
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type FilterMap map[string]*Exp
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type Blacklist *regexp.Regexp
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func CompileFilter(filter string) (*Exp, error) {
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node, err := ParseArgValue(filter)
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if err != nil {
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return nil, err
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}
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return (&Compiler{}).compileArgNode(node)
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}
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type Compiler struct {
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fm FilterMap
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bl *regexp.Regexp
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}
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func NewCompiler(fm FilterMap, bl Blacklist) *Compiler {
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return &Compiler{fm, bl}
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}
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func (com *Compiler) CompileQuery(query string) (*QCode, error) {
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var qc QCode
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var err error
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op, err := ParseQuery(query)
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if err != nil {
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return nil, err
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}
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switch op.Type {
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case opQuery:
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qc.Query, err = com.compileQuery(op)
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case opMutate:
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case opSub:
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default:
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err = fmt.Errorf("Unknown operation type %d", op.Type)
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}
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if err != nil {
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return nil, err
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}
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return &qc, nil
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}
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func (com *Compiler) compileQuery(op *Operation) (*Query, error) {
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var selRoot *Select
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st := util.NewStack()
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id := int32(0)
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fmap := make(map[*Field]*Select)
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for i := range op.Fields {
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st.Push(op.Fields[i])
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}
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for {
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if st.Len() == 0 {
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break
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}
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intf := st.Pop()
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field, ok := intf.(*Field)
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if !ok || field == nil {
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return nil, fmt.Errorf("unexpected value poped out %v", intf)
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}
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if com.bl != nil && com.bl.MatchString(field.Name) {
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continue
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}
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fn := strings.ToLower(field.Name)
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2019-03-25 05:43:14 +01:00
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tn := flect.Pluralize(fn)
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2019-03-24 14:57:29 +01:00
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s := &Select{
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2019-03-25 05:43:14 +01:00
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ID: id,
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Table: tn,
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}
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if fn == tn {
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s.Singular = flect.Singularize(fn)
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} else {
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s.Singular = fn
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2019-03-24 14:57:29 +01:00
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}
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if fn == s.Table {
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s.AsList = true
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} else {
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s.Paging.Limit = "1"
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}
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if len(field.Alias) != 0 {
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s.FieldName = field.Alias
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} else if s.AsList {
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s.FieldName = s.Table
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} else {
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s.FieldName = s.Singular
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}
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id++
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fmap[field] = s
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err := com.compileArgs(s, field.Args)
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if err != nil {
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return nil, err
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}
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for i := range field.Children {
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f := field.Children[i]
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2019-03-31 17:18:33 +02:00
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fn := strings.ToLower(f.Name)
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2019-03-24 14:57:29 +01:00
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2019-03-31 17:18:33 +02:00
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if com.bl != nil && com.bl.MatchString(fn) {
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2019-03-24 14:57:29 +01:00
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continue
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}
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if f.Children == nil {
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2019-03-31 17:18:33 +02:00
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col := &Column{Name: fn}
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2019-03-24 14:57:29 +01:00
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if len(f.Alias) != 0 {
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col.FieldName = f.Alias
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} else {
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col.FieldName = f.Name
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}
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2019-03-31 17:18:33 +02:00
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2019-03-24 14:57:29 +01:00
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s.Cols = append(s.Cols, col)
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} else {
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st.Push(f)
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}
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}
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if field.Parent == nil {
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selRoot = s
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} else if sp, ok := fmap[field.Parent]; ok {
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sp.Joins = append(sp.Joins, s)
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} else {
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return nil, fmt.Errorf("no select found for parent %#v", field.Parent)
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}
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}
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if fil, ok := com.fm[selRoot.Table]; ok {
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if selRoot.Where != nil {
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selRoot.Where = &Exp{Op: OpAnd, Children: []*Exp{fil, selRoot.Where}}
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} else {
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selRoot.Where = fil
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}
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}
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return &Query{selRoot}, nil
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}
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func (com *Compiler) compileArgs(sel *Select, args []*Arg) error {
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var err error
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for i := range args {
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if args[i] == nil {
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return fmt.Errorf("[Args] unexpected nil argument found")
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}
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switch strings.ToLower(args[i].Name) {
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case "where":
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err = com.compileArgWhere(sel, args[i])
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case "orderby", "order_by", "order":
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err = com.compileArgOrderBy(sel, args[i])
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case "distinct_on", "distinct":
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err = com.compileArgDistinctOn(sel, args[i])
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case "limit":
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err = com.compileArgLimit(sel, args[i])
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case "offset":
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err = com.compileArgOffset(sel, args[i])
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}
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}
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return err
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}
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type expT struct {
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parent *Exp
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node *Node
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}
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func (com *Compiler) compileArgObj(arg *Arg) (*Exp, error) {
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if arg.Val.Type != nodeObj {
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return nil, fmt.Errorf("[Where] expecting an object")
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}
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return com.compileArgNode(arg.Val)
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}
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func (com *Compiler) compileArgNode(val *Node) (*Exp, error) {
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st := util.NewStack()
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var root *Exp
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st.Push(&expT{nil, val.Children[0]})
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for {
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if st.Len() == 0 {
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break
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}
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intf := st.Pop()
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eT, ok := intf.(*expT)
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if !ok || eT == nil {
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return nil, fmt.Errorf("[Where] unexpected value poped out %v", intf)
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}
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2019-03-27 07:58:19 +01:00
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if len(eT.node.Name) != 0 &&
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com.bl != nil && com.bl.MatchString(eT.node.Name) {
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2019-03-24 14:57:29 +01:00
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continue
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}
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2019-03-27 07:58:19 +01:00
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ex, err := newExp(st, eT)
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2019-03-24 14:57:29 +01:00
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2019-03-27 07:58:19 +01:00
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if err != nil {
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return nil, err
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2019-03-24 14:57:29 +01:00
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}
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2019-03-27 07:58:19 +01:00
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if ex == nil {
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continue
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2019-03-24 14:57:29 +01:00
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}
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if eT.parent == nil {
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root = ex
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} else {
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eT.parent.Children = append(eT.parent.Children, ex)
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}
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}
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return root, nil
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}
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func (com *Compiler) compileArgWhere(sel *Select, arg *Arg) error {
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var err error
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sel.Where, err = com.compileArgObj(arg)
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if err != nil {
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return err
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}
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return nil
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}
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func (com *Compiler) compileArgOrderBy(sel *Select, arg *Arg) error {
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if arg.Val.Type != nodeObj {
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|
return fmt.Errorf("expecting an object")
|
|
|
|
}
|
|
|
|
|
|
|
|
st := util.NewStack()
|
|
|
|
|
|
|
|
for i := range arg.Val.Children {
|
|
|
|
st.Push(arg.Val.Children[i])
|
|
|
|
}
|
|
|
|
|
|
|
|
for {
|
|
|
|
if st.Len() == 0 {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
|
|
|
|
intf := st.Pop()
|
|
|
|
node, ok := intf.(*Node)
|
|
|
|
|
|
|
|
if !ok || node == nil {
|
|
|
|
return fmt.Errorf("OrderBy: unexpected value poped out %v", intf)
|
|
|
|
}
|
|
|
|
|
|
|
|
if com.bl != nil && com.bl.MatchString(node.Name) {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
if node.Type == nodeObj {
|
|
|
|
for i := range node.Children {
|
|
|
|
st.Push(node.Children[i])
|
|
|
|
}
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
ob := &OrderBy{}
|
|
|
|
|
|
|
|
val := strings.ToLower(node.Val)
|
|
|
|
switch val {
|
|
|
|
case "asc":
|
|
|
|
ob.Order = OrderAsc
|
|
|
|
case "desc":
|
|
|
|
ob.Order = OrderDesc
|
|
|
|
case "asc_nulls_first":
|
|
|
|
ob.Order = OrderAscNullsFirst
|
|
|
|
case "desc_nulls_first":
|
|
|
|
ob.Order = OrderDescNullsFirst
|
|
|
|
case "asc_nulls_last":
|
|
|
|
ob.Order = OrderAscNullsLast
|
|
|
|
case "desc_nulls_last":
|
|
|
|
ob.Order = OrderDescNullsLast
|
|
|
|
default:
|
|
|
|
return fmt.Errorf("valid values include asc, desc, asc_nulls_first and desc_nulls_first")
|
|
|
|
}
|
|
|
|
|
|
|
|
setOrderByColName(ob, node)
|
|
|
|
sel.OrderBy = append(sel.OrderBy, ob)
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (com *Compiler) compileArgDistinctOn(sel *Select, arg *Arg) error {
|
|
|
|
node := arg.Val
|
|
|
|
|
|
|
|
if com.bl != nil && com.bl.MatchString(node.Name) {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
if node.Type != nodeList && node.Type != nodeStr {
|
|
|
|
return fmt.Errorf("expecting a list of strings or just a string")
|
|
|
|
}
|
|
|
|
|
|
|
|
if node.Type == nodeStr {
|
|
|
|
sel.DistinctOn = append(sel.DistinctOn, node.Val)
|
|
|
|
}
|
|
|
|
|
|
|
|
for i := range node.Children {
|
|
|
|
sel.DistinctOn = append(sel.DistinctOn, node.Children[i].Val)
|
|
|
|
}
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (com *Compiler) compileArgLimit(sel *Select, arg *Arg) error {
|
|
|
|
node := arg.Val
|
|
|
|
|
|
|
|
if node.Type != nodeInt {
|
|
|
|
return fmt.Errorf("expecting an integer")
|
|
|
|
}
|
|
|
|
|
|
|
|
sel.Paging.Limit = node.Val
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (com *Compiler) compileArgOffset(sel *Select, arg *Arg) error {
|
|
|
|
node := arg.Val
|
|
|
|
|
|
|
|
if node.Type != nodeInt {
|
|
|
|
return fmt.Errorf("expecting an integer")
|
|
|
|
}
|
|
|
|
|
|
|
|
sel.Paging.Offset = node.Val
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func compileMutate() (*Query, error) {
|
|
|
|
return nil, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func compileSub() (*Query, error) {
|
|
|
|
return nil, nil
|
|
|
|
}
|
|
|
|
|
2019-03-27 07:58:19 +01:00
|
|
|
func newExp(st *util.Stack, eT *expT) (*Exp, error) {
|
|
|
|
ex := &Exp{}
|
|
|
|
node := eT.node
|
|
|
|
|
|
|
|
if len(node.Name) == 0 {
|
|
|
|
pushChildren(st, eT.parent, node)
|
|
|
|
return nil, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
name := strings.ToLower(node.Name)
|
|
|
|
if name[0] == '_' {
|
|
|
|
name = name[1:]
|
|
|
|
}
|
|
|
|
|
|
|
|
switch name {
|
|
|
|
case "and":
|
|
|
|
ex.Op = OpAnd
|
|
|
|
pushChildren(st, ex, node)
|
|
|
|
case "or":
|
|
|
|
ex.Op = OpOr
|
|
|
|
pushChildren(st, ex, node)
|
|
|
|
case "not":
|
|
|
|
ex.Op = OpNot
|
|
|
|
st.Push(&expT{ex, node.Children[0]})
|
|
|
|
case "eq", "equals":
|
|
|
|
ex.Op = OpEquals
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "neq", "not_equals":
|
|
|
|
ex.Op = OpNotEquals
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "gt", "greater_than":
|
|
|
|
ex.Op = OpGreaterThan
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "lt", "lesser_than":
|
|
|
|
ex.Op = OpLesserThan
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "gte", "greater_or_equals":
|
|
|
|
ex.Op = OpGreaterOrEquals
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "lte", "lesser_or_equals":
|
|
|
|
ex.Op = OpLesserOrEquals
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "in":
|
|
|
|
ex.Op = OpIn
|
|
|
|
setListVal(ex, node)
|
|
|
|
case "nin", "not_in":
|
|
|
|
ex.Op = OpNotIn
|
|
|
|
setListVal(ex, node)
|
|
|
|
case "like":
|
|
|
|
ex.Op = OpLike
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "nlike", "not_like":
|
|
|
|
ex.Op = OpNotLike
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "ilike":
|
|
|
|
ex.Op = OpILike
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "nilike", "not_ilike":
|
|
|
|
ex.Op = OpILike
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "similar":
|
|
|
|
ex.Op = OpSimilar
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "nsimilar", "not_similar":
|
|
|
|
ex.Op = OpNotSimilar
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "contains":
|
|
|
|
ex.Op = OpContains
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "contained_in":
|
|
|
|
ex.Op = OpContainedIn
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "has_key":
|
|
|
|
ex.Op = OpHasKey
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "has_key_any":
|
|
|
|
ex.Op = OpHasKeyAny
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "has_key_all":
|
|
|
|
ex.Op = OpHasKeyAll
|
|
|
|
ex.Val = node.Val
|
|
|
|
case "is_null":
|
|
|
|
ex.Op = OpIsNull
|
|
|
|
ex.Val = node.Val
|
|
|
|
default:
|
|
|
|
pushChildren(st, eT.parent, node)
|
|
|
|
return nil, nil // skip node
|
|
|
|
}
|
|
|
|
|
|
|
|
if ex.Op != OpAnd && ex.Op != OpOr && ex.Op != OpNot {
|
|
|
|
switch node.Type {
|
|
|
|
case nodeStr:
|
|
|
|
ex.Type = ValStr
|
|
|
|
case nodeInt:
|
|
|
|
ex.Type = ValInt
|
|
|
|
case nodeBool:
|
|
|
|
ex.Type = ValBool
|
|
|
|
case nodeFloat:
|
|
|
|
ex.Type = ValFloat
|
|
|
|
case nodeList:
|
|
|
|
ex.Type = ValList
|
|
|
|
case nodeVar:
|
|
|
|
ex.Type = ValVar
|
|
|
|
default:
|
|
|
|
return nil, fmt.Errorf("[Where] valid values include string, int, float, boolean and list: %s", node.Type)
|
|
|
|
}
|
|
|
|
setWhereColName(ex, node)
|
|
|
|
}
|
|
|
|
|
|
|
|
return ex, nil
|
|
|
|
}
|
|
|
|
|
2019-03-24 14:57:29 +01:00
|
|
|
func setListVal(ex *Exp, node *Node) {
|
|
|
|
if len(node.Children) != 0 {
|
|
|
|
switch node.Children[0].Type {
|
|
|
|
case nodeStr:
|
|
|
|
ex.ListType = ValStr
|
|
|
|
case nodeInt:
|
|
|
|
ex.ListType = ValInt
|
|
|
|
case nodeBool:
|
|
|
|
ex.ListType = ValBool
|
|
|
|
case nodeFloat:
|
|
|
|
ex.ListType = ValFloat
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for i := range node.Children {
|
|
|
|
ex.ListVal = append(ex.ListVal, node.Children[i].Val)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func setWhereColName(ex *Exp, node *Node) {
|
|
|
|
var list []string
|
|
|
|
for n := node.Parent; n != nil; n = n.Parent {
|
|
|
|
if n.Type != nodeObj {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
k := strings.ToLower(n.Name)
|
|
|
|
if k == "and" || k == "or" || k == "not" ||
|
|
|
|
k == "_and" || k == "_or" || k == "_not" {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
if len(k) != 0 {
|
|
|
|
list = append([]string{k}, list...)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if len(list) == 1 {
|
|
|
|
ex.Col = list[0]
|
|
|
|
|
|
|
|
} else if len(list) > 2 {
|
|
|
|
ex.Col = strings.Join(list, ".")
|
|
|
|
ex.NestedCol = true
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func setOrderByColName(ob *OrderBy, node *Node) {
|
|
|
|
var list []string
|
|
|
|
for n := node; n != nil; n = n.Parent {
|
|
|
|
k := strings.ToLower(n.Name)
|
|
|
|
if len(k) != 0 {
|
|
|
|
list = append([]string{k}, list...)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if len(list) != 0 {
|
|
|
|
ob.Col = strings.Join(list, ".")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func pushChildren(st *util.Stack, ex *Exp, node *Node) {
|
|
|
|
for i := range node.Children {
|
|
|
|
st.Push(&expT{ex, node.Children[i]})
|
|
|
|
}
|
|
|
|
}
|