74 lines
2.0 KiB
Go
74 lines
2.0 KiB
Go
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// Copyright 2013 MongoDB, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// author tolsen
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// author-github https://github.com/tolsen
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//
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// repository-name gojsonschema
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// repository-desc An implementation of JSON Schema, based on IETF's draft v4 - Go language.
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//
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// description Implements a persistent (immutable w/ shared structure) singly-linked list of strings for the purpose of storing a json context
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//
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// created 04-09-2013
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package gojsonschema
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import "bytes"
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// JsonContext implements a persistent linked-list of strings
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type JsonContext struct {
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head string
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tail *JsonContext
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}
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// NewJsonContext creates a new JsonContext
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func NewJsonContext(head string, tail *JsonContext) *JsonContext {
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return &JsonContext{head, tail}
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}
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// String displays the context in reverse.
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// This plays well with the data structure's persistent nature with
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// Cons and a json document's tree structure.
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func (c *JsonContext) String(del ...string) string {
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byteArr := make([]byte, 0, c.stringLen())
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buf := bytes.NewBuffer(byteArr)
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c.writeStringToBuffer(buf, del)
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return buf.String()
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}
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func (c *JsonContext) stringLen() int {
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length := 0
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if c.tail != nil {
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length = c.tail.stringLen() + 1 // add 1 for "."
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}
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length += len(c.head)
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return length
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}
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func (c *JsonContext) writeStringToBuffer(buf *bytes.Buffer, del []string) {
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if c.tail != nil {
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c.tail.writeStringToBuffer(buf, del)
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if len(del) > 0 {
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buf.WriteString(del[0])
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} else {
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buf.WriteString(".")
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}
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}
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buf.WriteString(c.head)
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}
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