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// Copyright 2013 MongoDB, 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.
// author tolsen
// author-github https://github.com/tolsen
//
// repository-name gojsonschema
// repository-desc An implementation of JSON Schema, based on IETF's draft v4 - Go language.
//
// description Implements a persistent (immutable w/ shared structure) singly-linked list of strings for the purpose of storing a json context
//
// created 04-09-2013
package gojsonschema
import "bytes"
// JsonContext implements a persistent linked-list of strings
type JsonContext struct {
head string
tail *JsonContext
}
func NewJsonContext(head string, tail *JsonContext) *JsonContext {
return &JsonContext{head, tail}
}
// String displays the context in reverse.
// This plays well with the data structure's persistent nature with
// Cons and a json document's tree structure.
func (c *JsonContext) String(del ...string) string {
byteArr := make([]byte, 0, c.stringLen())
buf := bytes.NewBuffer(byteArr)
c.writeStringToBuffer(buf, del)
return buf.String()
}
func (c *JsonContext) stringLen() int {
length := 0
if c.tail != nil {
length = c.tail.stringLen() + 1 // add 1 for "."
}
length += len(c.head)
return length
}
func (c *JsonContext) writeStringToBuffer(buf *bytes.Buffer, del []string) {
if c.tail != nil {
c.tail.writeStringToBuffer(buf, del)
if len(del) > 0 {
buf.WriteString(del[0])
} else {
buf.WriteString(".")
}
}
buf.WriteString(c.head)
}
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