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checker.go
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checker.go
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package kvql
func (e *BinaryOpExpr) Check(ctx *CheckCtx) error {
if err := e.Left.Check(ctx); err != nil {
return err
}
if err := e.Right.Check(ctx); err != nil {
return err
}
e.tryRewriteExpr(ctx)
switch e.Op {
case And, Or:
return e.checkWithAndOr(ctx)
case Not:
return NewSyntaxError(e.GetPos(), "Invalid operator !")
case Add, Sub, Mul, Div:
return e.checkWithMath(ctx)
case In:
return e.checkWithIn(ctx)
case Between:
return e.checkWithBetween(ctx)
default:
return e.checkWithCompares(ctx)
}
}
func (e *BinaryOpExpr) tryRewriteExpr(ctx *CheckCtx) {
switch lexp := e.Left.(type) {
case *NameExpr:
if nexpr, have := ctx.GetNamedExpr(lexp.Data); have {
e.Left = &FieldReferenceExpr{
Name: lexp,
FieldExpr: nexpr,
}
}
}
switch rexp := e.Right.(type) {
case *NameExpr:
if nexpr, have := ctx.GetNamedExpr(rexp.Data); have {
e.Right = &FieldReferenceExpr{
Name: rexp,
FieldExpr: nexpr,
}
}
}
}
func (e *BinaryOpExpr) checkWithAndOr(ctx *CheckCtx) error {
op := OperatorToString[e.Op]
switch exp := e.Left.(type) {
case *BinaryOpExpr, *FunctionCallExpr, *NotExpr, *FieldReferenceExpr:
if e.Left.ReturnType() != TBOOL {
return NewSyntaxError(e.Left.GetPos(), "%s operator has wrong type of left expression %s", op, exp)
}
default:
return NewSyntaxError(e.Left.GetPos(), "%s operator with invalid left expression %s", op, exp)
}
switch exp := e.Right.(type) {
case *BinaryOpExpr, *FunctionCallExpr, *NotExpr, *FieldReferenceExpr:
if exp.ReturnType() != TBOOL {
return NewSyntaxError(e.Right.GetPos(), "%s operator has wrong type of right expression %s", op, exp)
}
default:
return NewSyntaxError(e.Right.GetPos(), "%s operator with invalid right expression %s", op, exp)
}
return nil
}
func (e *BinaryOpExpr) checkWithMath(ctx *CheckCtx) error {
op := OperatorToString[e.Op]
lstring := false
rstring := false
switch exp := e.Left.(type) {
case *BinaryOpExpr, *FunctionCallExpr, *NumberExpr, *FloatExpr, *FieldReferenceExpr:
if e.Left.ReturnType() != TNUMBER {
if e.Left.ReturnType() == TSTR {
lstring = true
} else {
return NewSyntaxError(e.Left.GetPos(), "%s operator has wrong type of left expression %s", op, exp)
}
}
case *StringExpr, *FieldExpr, *FieldAccessExpr:
lstring = true
default:
return NewSyntaxError(e.Left.GetPos(), "%s operator with invalid left expression %s", op, exp)
}
switch exp := e.Right.(type) {
case *BinaryOpExpr, *FunctionCallExpr, *NumberExpr, *FloatExpr, *FieldReferenceExpr:
if e.Right.ReturnType() != TNUMBER {
if e.Right.ReturnType() == TSTR {
rstring = true
} else {
return NewSyntaxError(e.Right.GetPos(), "%s operator has wrong type of right expression %s", op, exp)
}
}
case *StringExpr, *FieldExpr, *FieldAccessExpr:
rstring = true
default:
return NewSyntaxError(e.Right.GetPos(), "%s operator with invalid right expression %s", op, exp)
}
if op == "+" && lstring && rstring {
} else {
if lstring {
return NewSyntaxError(e.Left.GetPos(), "%s operator with invalid left expression %s", op, e.Left)
}
if rstring {
return NewSyntaxError(e.Right.GetPos(), "%s operator with invalid right expression %s", op, e.Left)
}
}
if op == "/" {
switch rval := e.Right.(type) {
case *NumberExpr:
if rval.Int == 0 {
return NewSyntaxError(e.Right.GetPos(), "/ operator divide by zero")
}
case *FloatExpr:
if rval.Float == 0.0 {
return NewSyntaxError(e.Right.GetPos(), "/ operator divide by zero")
}
}
}
return nil
}
func (e *BinaryOpExpr) checkWithCompares(ctx *CheckCtx) error {
var (
numKeyFieldExpr = 0
numValueFieldExpr = 0
numCallExpr = 0
)
op := OperatorToString[e.Op]
switch exp := e.Left.(type) {
case *FieldExpr:
switch exp.Field {
case KeyKW:
numKeyFieldExpr++
case ValueKW:
numValueFieldExpr++
}
case *FunctionCallExpr, *FieldReferenceExpr:
numCallExpr++
case *StringExpr, *BoolExpr, *NumberExpr, *FloatExpr, *BinaryOpExpr, *FieldAccessExpr:
default:
return NewSyntaxError(e.Left.GetPos(), "%s operator with invalid left expression", op)
}
switch exp := e.Right.(type) {
case *FieldExpr:
switch exp.Field {
case KeyKW:
numKeyFieldExpr++
case ValueKW:
numValueFieldExpr++
}
case *FunctionCallExpr, *FieldReferenceExpr:
numCallExpr++
case *StringExpr, *BoolExpr, *NumberExpr, *FloatExpr, *BinaryOpExpr, *FieldAccessExpr:
default:
return NewSyntaxError(e.Right.GetPos(), "%s operator with invalid right expression", op)
}
if numKeyFieldExpr == 2 || numValueFieldExpr == 2 {
return NewSyntaxError(e.GetPos(), "%s operator with two same field", op)
}
ltype := e.Left.ReturnType()
rtype := e.Right.ReturnType()
if ltype != rtype {
return NewSyntaxError(e.GetPos(), "%s operator left and right type not same", op)
}
switch e.Op {
case Gt, Gte, Lt, Lte:
if ltype != TNUMBER && ltype != TSTR {
return NewSyntaxError(e.Left.GetPos(), "%s operator has wrong type of left expression", op)
}
case PrefixMatch, RegExpMatch:
if ltype != TSTR {
return NewSyntaxError(e.Left.GetPos(), "%s operator has wrong type of left expression", op)
}
}
return nil
}
func (e *BinaryOpExpr) checkWithIn(ctx *CheckCtx) error {
ltype := e.Left.ReturnType()
switch r := e.Right.(type) {
case *ListExpr:
for _, expr := range r.List {
if expr.ReturnType() != ltype {
return NewSyntaxError(expr.GetPos(), "in operator element has wrong type")
}
}
case *FunctionCallExpr, *FieldReferenceExpr:
if r.ReturnType() != TLIST {
return NewSyntaxError(r.GetPos(), "in operator element has wrong type")
}
default:
return NewSyntaxError(e.Right.GetPos(), "in operator right expression must be list expression")
}
return nil
}
func (e *BinaryOpExpr) checkWithBetween(ctx *CheckCtx) error {
ltype := e.Left.ReturnType()
rlist, ok := e.Right.(*ListExpr)
if !ok || len(rlist.List) != 2 {
return NewSyntaxError(e.Right.GetPos(), "between operator invalid right expression")
}
switch ltype {
case TSTR, TNUMBER:
default:
return NewSyntaxError(e.Left.GetPos(), "between operator only support string and number type")
}
lexpr := rlist.List[0]
uexpr := rlist.List[1]
if lexpr.ReturnType() != ltype || uexpr.ReturnType() != ltype {
return NewSyntaxError(e.Right.GetPos(), "between operator right expression with wrong type")
}
return nil
}
func (e *FieldExpr) Check(ctx *CheckCtx) error {
if e.Field == KeyKW && ctx.NotAllowKey {
return NewSyntaxError(e.Pos, "not allow key keyword in expression")
}
if e.Field == ValueKW && ctx.NotAllowValue {
return NewSyntaxError(e.Pos, "not allow value keyword in expression")
}
return nil
}
func (e *StringExpr) Check(ctx *CheckCtx) error {
return nil
}
func (e *NotExpr) Check(ctx *CheckCtx) error {
if e.Right.ReturnType() != TBOOL {
return NewSyntaxError(e.Right.GetPos(), "! operator right expression has wrong type")
}
return nil
}
func (e *FunctionCallExpr) Check(ctx *CheckCtx) error {
_, ok := e.Name.(*NameExpr)
if !ok {
return NewSyntaxError(e.Name.GetPos(), "Invalid function name")
}
if len(e.Args) > 0 {
for i, a := range e.Args {
a = e.tryRewriteExpr(i, ctx)
if err := a.Check(ctx); err != nil {
return err
}
}
}
return nil
}
func (e *FunctionCallExpr) tryRewriteExpr(idx int, ctx *CheckCtx) Expression {
ret := e.Args[idx]
switch aexp := ret.(type) {
case *NameExpr:
if nexpr, have := ctx.GetNamedExpr(aexp.Data); have {
narg := &FieldReferenceExpr{
Name: aexp,
FieldExpr: nexpr,
}
e.Args[idx] = narg
return narg
}
}
return ret
}
func (e *NameExpr) Check(ctx *CheckCtx) error {
return nil
}
func (e *FloatExpr) Check(ctx *CheckCtx) error {
return nil
}
func (e *NumberExpr) Check(ctx *CheckCtx) error {
return nil
}
func (e *BoolExpr) Check(ctx *CheckCtx) error {
return nil
}
func (e *ListExpr) Check(ctx *CheckCtx) error {
if len(e.List) == 0 {
return NewSyntaxError(e.GetPos(), "Empty list")
}
if len(e.List) > 1 {
ftype := e.List[0].ReturnType()
for i, item := range e.List[1:] {
if item.ReturnType() != ftype {
return NewSyntaxError(item.GetPos(), "List %d item has wrong type", i)
}
}
}
return nil
}
func (e *FieldAccessExpr) Check(ctx *CheckCtx) error {
_, leftIsFAE := e.Left.(*FieldAccessExpr)
lrType := e.Left.ReturnType()
switch lrType {
case TJSON, TLIST:
default:
if leftIsFAE {
// Support cascade field access such as:
// json(value)['x']['y']
return nil
}
return NewSyntaxError(e.Left.GetPos(), "Field access expression left require JSON or List type")
}
switch e.FieldName.(type) {
case *StringExpr:
if lrType == TJSON {
return nil
} else if leftIsFAE {
// Support cascade array index access such as:
// json(value)['list'][1]
return nil
}
case *NumberExpr:
if lrType == TLIST {
return nil
} else if leftIsFAE {
// Support cascade array index access such as:
// json(value)['list'][1]
return nil
}
}
return NewSyntaxError(e.FieldName.GetPos(), "Invalid field name")
}
func (e *FieldReferenceExpr) Check(ctx *CheckCtx) error {
return nil
}