111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
// Copyright 2014 The Cayley Authors. All rights reserved.
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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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package mql
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import (
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"fmt"
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"strings"
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"github.com/google/cayley/graph"
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)
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type MqlPath string
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type MqlResultPath string
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type MqlQuery struct {
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ses *Session
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it graph.Iterator
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isRepeated map[MqlPath]bool
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queryStructure map[MqlPath]map[string]interface{}
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queryResult map[MqlResultPath]map[string]interface{}
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results []interface{}
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resultOrder []string
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isError bool
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err error
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}
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func (mqlQuery *MqlQuery) copyPathStructure(path MqlPath) map[string]interface{} {
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output := make(map[string]interface{})
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for k, v := range mqlQuery.queryStructure[path] {
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output[k] = v
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}
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return output
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}
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func NewMqlPath() MqlPath {
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return ""
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}
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func (p MqlPath) Follow(s string) MqlPath {
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return MqlPath(fmt.Sprintf("%s\x1E%s", p, s))
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}
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func (p MqlPath) DisplayString() string {
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return strings.Replace(string(p), "\x1E", ".", -1)
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}
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func NewMqlResultPath() MqlResultPath {
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return ""
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}
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func (p MqlResultPath) FollowPath(followPiece string, value string) MqlResultPath {
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if string(p) == "" {
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return MqlResultPath(fmt.Sprintf("%s\x1E%s", value, followPiece))
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}
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return MqlResultPath(fmt.Sprintf("%s\x1E%s\x1E%s", p, value, followPiece))
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}
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func (p MqlResultPath) getPath() MqlPath {
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out := NewMqlPath()
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pathPieces := strings.Split(string(p), "\x1E")
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for len(pathPieces) > 1 {
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a := pathPieces[1]
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pathPieces = pathPieces[2:]
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out = out.Follow(a)
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}
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return out
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}
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func (p MqlResultPath) splitLastPath() (MqlResultPath, string) {
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pathPieces := strings.Split(string(p), "\x1E")
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return MqlResultPath(strings.Join(pathPieces[:len(pathPieces)-1], "\x1E")), pathPieces[len(pathPieces)-1]
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}
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func (p MqlResultPath) AppendValue(value string) MqlResultPath {
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if string(p) == "" {
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return MqlResultPath(value)
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}
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return MqlResultPath(fmt.Sprintf("%s\x1E%s", p, value))
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}
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func (p MqlPath) ToResultPathFromMap(resultMap map[MqlPath]string) MqlResultPath {
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output := NewMqlResultPath()
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pathPieces := strings.Split(string(p), "\x1E")[1:]
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pathSoFar := NewMqlPath()
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for _, piece := range pathPieces {
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output = output.FollowPath(piece, resultMap[pathSoFar])
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pathSoFar = pathSoFar.Follow(piece)
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}
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return output
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}
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func NewMqlQuery(ses *Session) *MqlQuery {
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var q MqlQuery
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q.ses = ses
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q.results = make([]interface{}, 0)
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q.resultOrder = make([]string, 0)
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q.err = nil
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q.isError = false
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return &q
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}
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