Small edit (#246)

[bytom/vapor.git] / blockchain / query / filter / expr.go

diff --git a/blockchain/query/filter/expr.go b/blockchain/query/filter/expr.go
deleted file mode 100644 (file)
index 143f0fd..0000000
--- a/blockchain/query/filter/expr.go
+++ /dev/null
@@ -1,95 +0,0 @@
-package filter
-
-import "fmt"
-
-type expr interface {
-       String() string
-}
-
-type binaryExpr struct {
-       op   *binaryOp
-       l, r expr
-}
-
-func (e binaryExpr) String() string {
-       return e.l.String() + " " + e.op.name + " " + e.r.String()
-}
-
-type attrExpr struct {
-       attr string
-}
-
-func (e attrExpr) String() string {
-       return e.attr
-}
-
-type selectorExpr struct {
-       ident   string
-       objExpr expr
-}
-
-func (e selectorExpr) String() string {
-       return e.objExpr.String() + "." + e.ident
-}
-
-type parenExpr struct {
-       inner expr
-}
-
-func (e parenExpr) String() string {
-       return "(" + e.inner.String() + ")"
-}
-
-type valueExpr struct {
-       typ   token
-       value string
-}
-
-func (e valueExpr) String() string {
-       return e.value
-}
-
-type envExpr struct {
-       ident string
-       expr  expr
-}
-
-func (e envExpr) String() string {
-       return e.ident + "(" + e.expr.String() + ")"
-}
-
-type placeholderExpr struct {
-       num int
-}
-
-func (e placeholderExpr) String() string {
-       return fmt.Sprintf("$%d", e.num)
-}
-
-// Type defines the value types in filter expressions.
-type Type int
-
-//defines the value types in filter expressions.
-const (
-       Any Type = iota
-       Bool
-       String
-       Integer
-       Object
-)
-
-func (t Type) String() string {
-       switch t {
-       case Any:
-               return "any"
-       case Bool:
-               return "bool"
-       case String:
-               return "string"
-       case Integer:
-               return "integer"
-       case Object:
-               return "object"
-       }
-       panic("unknown type")
-}