Destutter filenames

query/gremlin/environ.go

@@ -0,0 +1,95 @@
+// 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")
+
+}