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gremlin_env.go
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gremlin_env.go
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// Copyright 2014 The Cayley Authors. All rights reserved.
//
// 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 gremlin
// Builds a new Gremlin environment pointing at a session.
import (
"github.com/barakmich/glog"
"github.com/robertkrimen/otto"
)
func BuildGremlinEnv(ses *GremlinSession) *otto.Otto {
env := otto.New()
setupGremlin(env, ses)
return env
}
func concatStringArgs(call otto.FunctionCall) *[]interface{} {
outStrings := make([]interface{}, 0)
for _, arg := range call.ArgumentList {
if arg.IsString() {
outStrings = append(outStrings, arg.String())
}
if arg.IsObject() && arg.Class() == "Array" {
obj, _ := arg.Export()
for _, x := range obj.([]interface{}) {
outStrings = append(outStrings, x.(string))
}
}
}
return &outStrings
}
func isVertexChain(obj *otto.Object) bool {
val, _ := obj.Get("_gremlin_type")
if x, _ := val.ToString(); x == "vertex" {
return true
}
val, _ = obj.Get("_gremlin_prev")
if val.IsObject() {
return isVertexChain(val.Object())
}
return false
}
func setupGremlin(env *otto.Otto, ses *GremlinSession) {
graph, _ := env.Object("graph = {}")
graph.Set("Vertex", func(call otto.FunctionCall) otto.Value {
call.Otto.Run("var out = {}")
out, err := call.Otto.Object("out")
if err != nil {
glog.Error(err.Error())
return otto.TrueValue()
}
out.Set("_gremlin_type", "vertex")
outStrings := concatStringArgs(call)
if len(*outStrings) > 0 {
out.Set("string_args", *outStrings)
}
embedTraversals(env, ses, out)
embedFinals(env, ses, out)
return out.Value()
})
graph.Set("Morphism", func(call otto.FunctionCall) otto.Value {
call.Otto.Run("var out = {}")
out, _ := call.Otto.Object("out")
out.Set("_gremlin_type", "morphism")
embedTraversals(env, ses, out)
return out.Value()
})
graph.Set("Emit", func(call otto.FunctionCall) otto.Value {
value := call.Argument(0)
if value.IsDefined() {
ses.SendResult(&GremlinResult{metaresult: false, err: "", val: &value, actualResults: nil})
}
return otto.NullValue()
})
env.Run("graph.V = graph.Vertex")
env.Run("graph.M = graph.Morphism")
env.Run("g = graph")
}