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property.go
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property.go
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// Copyright (c) 2013 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package ast
import (
"fmt"
"github.com/couchbaselabs/dparval"
)
type Property struct {
Type string `json:"type"`
Path string `json:"path"`
}
func NewProperty(path string) *Property {
return &Property{
Type: "property",
Path: path,
}
}
func (this *Property) Copy() Expression {
return &Property{
Type: "property",
Path: this.Path,
}
}
func (this *Property) Evaluate(item *dparval.Value) (*dparval.Value, error) {
if item == nil {
return nil, &dparval.Undefined{this.Path}
}
pv, err := item.Path(this.Path)
if err != nil {
return nil, err
}
return pv, nil
}
func (this *Property) String() string {
return fmt.Sprintf("%s", this.Path)
}
func (this *Property) EquivalentTo(t Expression) bool {
that, ok := t.(*Property)
if !ok {
return false
}
if this.Path != that.Path {
return false
}
return true
}
func (this *Property) Dependencies() ExpressionList {
rv := ExpressionList{}
return rv
}
func (this *Property) Accept(ev ExpressionVisitor) (Expression, error) {
return ev.Visit(this)
}