95 lines
2.6 KiB
Go
95 lines
2.6 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 gremlin
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// Builds a new Gremlin environment pointing at a session.
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import (
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"github.com/barakmich/glog"
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"github.com/robertkrimen/otto"
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)
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func BuildEnviron(ses *Session) *otto.Otto {
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env := otto.New()
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setupGremlin(env, ses)
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return env
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}
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func concatStringArgs(call otto.FunctionCall) *[]interface{} {
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outStrings := make([]interface{}, 0)
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for _, arg := range call.ArgumentList {
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if arg.IsString() {
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outStrings = append(outStrings, arg.String())
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}
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if arg.IsObject() && arg.Class() == "Array" {
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obj, _ := arg.Export()
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for _, x := range obj.([]interface{}) {
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outStrings = append(outStrings, x.(string))
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}
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}
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}
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return &outStrings
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}
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func isVertexChain(obj *otto.Object) bool {
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val, _ := obj.Get("_gremlin_type")
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if x, _ := val.ToString(); x == "vertex" {
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return true
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}
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val, _ = obj.Get("_gremlin_prev")
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if val.IsObject() {
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return isVertexChain(val.Object())
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}
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return false
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}
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func setupGremlin(env *otto.Otto, ses *Session) {
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graph, _ := env.Object("graph = {}")
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graph.Set("Vertex", func(call otto.FunctionCall) otto.Value {
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call.Otto.Run("var out = {}")
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out, err := call.Otto.Object("out")
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if err != nil {
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glog.Error(err.Error())
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return otto.TrueValue()
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}
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out.Set("_gremlin_type", "vertex")
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outStrings := concatStringArgs(call)
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if len(*outStrings) > 0 {
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out.Set("string_args", *outStrings)
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}
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embedTraversals(env, ses, out)
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embedFinals(env, ses, out)
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return out.Value()
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})
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graph.Set("Morphism", func(call otto.FunctionCall) otto.Value {
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call.Otto.Run("var out = {}")
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out, _ := call.Otto.Object("out")
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out.Set("_gremlin_type", "morphism")
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embedTraversals(env, ses, out)
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return out.Value()
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})
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graph.Set("Emit", func(call otto.FunctionCall) otto.Value {
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value := call.Argument(0)
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if value.IsDefined() {
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ses.SendResult(&GremlinResult{metaresult: false, err: "", val: &value, actualResults: nil})
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}
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return otto.NullValue()
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})
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env.Run("graph.V = graph.Vertex")
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env.Run("graph.M = graph.Morphism")
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env.Run("g = graph")
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}
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