Rewrite Gremlin's buildIterator in terms of paths

This commit is contained in:
Barak Michener 2015-10-28 21:26:29 -04:00
parent 97247ae40f
commit f74051a520
5 changed files with 246 additions and 391 deletions

View file

@ -15,6 +15,7 @@
package gremlin
import (
"fmt"
"strconv"
"github.com/barakmich/glog"
@ -22,7 +23,7 @@ import (
"github.com/google/cayley/graph"
"github.com/google/cayley/graph/iterator"
"github.com/google/cayley/quad"
"github.com/google/cayley/graph/path"
)
func propertiesOf(obj *otto.Object, name string) []string {
@ -38,7 +39,133 @@ func buildIteratorTree(obj *otto.Object, qs graph.QuadStore) graph.Iterator {
if !isVertexChain(obj) {
return iterator.NewNull()
}
return buildIteratorTreeHelper(obj, qs, iterator.NewNull())
path := buildPathFromObject(obj)
if path == nil {
return iterator.NewNull()
}
return path.BuildIteratorOn(qs)
}
func getFirstArgAsVertexChain(obj *otto.Object) *otto.Object {
arg, _ := obj.Get("_gremlin_values")
firstArg, _ := arg.Object().Get("0")
if !isVertexChain(firstArg.Object()) {
return nil
}
return firstArg.Object()
}
func getFirstArgAsMorphismChain(obj *otto.Object) *otto.Object {
arg, _ := obj.Get("_gremlin_values")
firstArg, _ := arg.Object().Get("0")
if isVertexChain(firstArg.Object()) {
return nil
}
return firstArg.Object()
}
func buildPathFromObject(obj *otto.Object) *path.Path {
var p *path.Path
val, _ := obj.Get("_gremlin_type")
stringArgs := propertiesOf(obj, "string_args")
gremlinType := val.String()
if prev, _ := obj.Get("_gremlin_prev"); !prev.IsObject() {
switch gremlinType {
case "vertex":
return path.StartMorphism(stringArgs...)
case "morphism":
return path.StartMorphism()
default:
panic("No base gremlin path other than 'vertex' or 'morphism'")
}
} else {
p = buildPathFromObject(prev.Object())
}
if p == nil {
return nil
}
switch gremlinType {
case "Is":
return p.Is(stringArgs...)
case "In":
preds, tags, ok := getViaData(obj)
if !ok {
return nil
}
return p.InWithTags(tags, preds...)
case "Out":
preds, tags, ok := getViaData(obj)
if !ok {
return nil
}
return p.OutWithTags(tags, preds...)
case "Both":
preds, _, ok := getViaData(obj)
if !ok {
return nil
}
return p.Both(preds...)
case "Follow":
subobj := getFirstArgAsMorphismChain(obj)
if subobj == nil {
return nil
}
return p.Follow(buildPathFromObject(subobj))
case "FollowR":
subobj := getFirstArgAsMorphismChain(obj)
if subobj == nil {
return nil
}
return p.FollowReverse(buildPathFromObject(subobj))
case "And", "Intersect":
subobj := getFirstArgAsVertexChain(obj)
if subobj == nil {
return nil
}
return p.And(buildPathFromObject(subobj))
case "Union", "Or":
subobj := getFirstArgAsVertexChain(obj)
if subobj == nil {
return nil
}
return p.And(buildPathFromObject(subobj))
case "Back":
if len(stringArgs) != 1 {
return nil
}
return p.Back(stringArgs[0])
case "Tag", "As":
return p.Tag(stringArgs...)
case "Has":
if len(stringArgs) < 2 {
return nil
}
return p.Has(stringArgs[0], stringArgs[1:]...)
case "Save", "SaveR":
if len(stringArgs) > 2 || len(stringArgs) == 0 {
return nil
}
tag := stringArgs[0]
if len(stringArgs) == 2 {
tag = stringArgs[1]
}
if gremlinType == "SaveR" {
return p.SaveReverse(stringArgs[0], tag)
}
return p.Save(stringArgs[0], tag)
case "Except", "Difference":
subobj := getFirstArgAsVertexChain(obj)
if subobj == nil {
return nil
}
return p.Except(buildPathFromObject(subobj))
case "InPredicates":
return p.InPredicates()
case "OutPredicates":
return p.OutPredicates()
default:
panic(fmt.Sprint("Unimplemented Gremlin function", gremlinType))
}
}
func stringsFrom(obj *otto.Object) []string {
@ -57,32 +184,30 @@ func stringsFrom(obj *otto.Object) []string {
return output
}
func buildIteratorFromValue(val otto.Value, qs graph.QuadStore) graph.Iterator {
func buildPathFromValue(val otto.Value) (out []interface{}) {
if val.IsNull() || val.IsUndefined() {
return qs.NodesAllIterator()
return nil
}
if val.IsPrimitive() {
thing, _ := val.Export()
switch v := thing.(type) {
case string:
it := qs.FixedIterator()
it.Add(qs.ValueOf(v))
return it
out = append(out, v)
return
default:
glog.Errorln("Trying to build unknown primitive value.")
}
}
switch val.Class() {
case "Object":
return buildIteratorTree(val.Object(), qs)
out = append(out, buildPathFromObject(val.Object()))
return
case "Array":
// Had better be an array of strings
strings := stringsFrom(val.Object())
it := qs.FixedIterator()
for _, x := range strings {
it.Add(qs.ValueOf(x))
for _, x := range stringsFrom(val.Object()) {
out = append(out, x)
}
return it
return
case "Number":
fallthrough
case "Boolean":
@ -90,248 +215,37 @@ func buildIteratorFromValue(val otto.Value, qs graph.QuadStore) graph.Iterator {
case "Date":
fallthrough
case "String":
it := qs.FixedIterator()
it.Add(qs.ValueOf(val.String()))
return it
out = append(out, val.String())
return
default:
glog.Errorln("Trying to handle unsupported Javascript value.")
return iterator.NewNull()
return nil
}
}
func buildInOutIterator(obj *otto.Object, qs graph.QuadStore, base graph.Iterator, isReverse bool) graph.Iterator {
func getViaData(obj *otto.Object) (predicates []interface{}, tags []string, ok bool) {
argList, _ := obj.Get("_gremlin_values")
if argList.Class() != "GoArray" {
glog.Errorln("How is arglist not an array? Return nothing.", argList.Class())
return iterator.NewNull()
return nil, nil, false
}
argArray := argList.Object()
lengthVal, _ := argArray.Get("length")
length, _ := lengthVal.ToInteger()
var predicateNodeIterator graph.Iterator
if length == 0 {
predicateNodeIterator = qs.NodesAllIterator()
predicates = []interface{}{}
} else {
zero, _ := argArray.Get("0")
predicateNodeIterator = buildIteratorFromValue(zero, qs)
predicates = buildPathFromValue(zero)
}
if length >= 2 {
var tags []string
one, _ := argArray.Get("1")
if one.IsString() {
tags = append(tags, one.String())
} else if one.Class() == "Array" {
tags = stringsFrom(one.Object())
}
for _, tag := range tags {
predicateNodeIterator.Tagger().Add(tag)
}
}
in, out := quad.Subject, quad.Object
if isReverse {
in, out = out, in
}
lto := iterator.NewLinksTo(qs, base, in)
and := iterator.NewAnd(qs)
and.AddSubIterator(iterator.NewLinksTo(qs, predicateNodeIterator, quad.Predicate))
and.AddSubIterator(lto)
return iterator.NewHasA(qs, and, out)
}
func buildInOutPredicateIterator(obj *otto.Object, qs graph.QuadStore, base graph.Iterator, isReverse bool) graph.Iterator {
dir := quad.Subject
if isReverse {
dir = quad.Object
}
lto := iterator.NewLinksTo(qs, base, dir)
hasa := iterator.NewHasA(qs, lto, quad.Predicate)
return iterator.NewUnique(hasa)
}
func buildIteratorTreeHelper(obj *otto.Object, qs graph.QuadStore, base graph.Iterator) graph.Iterator {
// TODO: Better error handling
var (
it graph.Iterator
subIt graph.Iterator
)
if prev, _ := obj.Get("_gremlin_prev"); !prev.IsObject() {
subIt = base
} else {
subIt = buildIteratorTreeHelper(prev.Object(), qs, base)
}
stringArgs := propertiesOf(obj, "string_args")
val, _ := obj.Get("_gremlin_type")
switch val.String() {
case "vertex":
if len(stringArgs) == 0 {
it = qs.NodesAllIterator()
} else {
fixed := qs.FixedIterator()
for _, name := range stringArgs {
fixed.Add(qs.ValueOf(name))
}
it = fixed
}
case "tag":
it = subIt
for _, tag := range stringArgs {
it.Tagger().Add(tag)
}
case "save":
all := qs.NodesAllIterator()
if len(stringArgs) > 2 || len(stringArgs) == 0 {
return iterator.NewNull()
}
if len(stringArgs) == 2 {
all.Tagger().Add(stringArgs[1])
} else {
all.Tagger().Add(stringArgs[0])
}
predFixed := qs.FixedIterator()
predFixed.Add(qs.ValueOf(stringArgs[0]))
subAnd := iterator.NewAnd(qs)
subAnd.AddSubIterator(iterator.NewLinksTo(qs, predFixed, quad.Predicate))
subAnd.AddSubIterator(iterator.NewLinksTo(qs, all, quad.Object))
hasa := iterator.NewHasA(qs, subAnd, quad.Subject)
and := iterator.NewAnd(qs)
and.AddSubIterator(hasa)
and.AddSubIterator(subIt)
it = and
case "saver":
all := qs.NodesAllIterator()
if len(stringArgs) > 2 || len(stringArgs) == 0 {
return iterator.NewNull()
}
if len(stringArgs) == 2 {
all.Tagger().Add(stringArgs[1])
} else {
all.Tagger().Add(stringArgs[0])
}
predFixed := qs.FixedIterator()
predFixed.Add(qs.ValueOf(stringArgs[0]))
subAnd := iterator.NewAnd(qs)
subAnd.AddSubIterator(iterator.NewLinksTo(qs, predFixed, quad.Predicate))
subAnd.AddSubIterator(iterator.NewLinksTo(qs, all, quad.Subject))
hasa := iterator.NewHasA(qs, subAnd, quad.Object)
and := iterator.NewAnd(qs)
and.AddSubIterator(hasa)
and.AddSubIterator(subIt)
it = and
case "has":
fixed := qs.FixedIterator()
if len(stringArgs) < 2 {
return iterator.NewNull()
}
for _, name := range stringArgs[1:] {
fixed.Add(qs.ValueOf(name))
}
predFixed := qs.FixedIterator()
predFixed.Add(qs.ValueOf(stringArgs[0]))
subAnd := iterator.NewAnd(qs)
subAnd.AddSubIterator(iterator.NewLinksTo(qs, predFixed, quad.Predicate))
subAnd.AddSubIterator(iterator.NewLinksTo(qs, fixed, quad.Object))
hasa := iterator.NewHasA(qs, subAnd, quad.Subject)
and := iterator.NewAnd(qs)
and.AddSubIterator(hasa)
and.AddSubIterator(subIt)
it = and
case "morphism":
it = base
case "and":
arg, _ := obj.Get("_gremlin_values")
firstArg, _ := arg.Object().Get("0")
if !isVertexChain(firstArg.Object()) {
return iterator.NewNull()
}
argIt := buildIteratorTree(firstArg.Object(), qs)
and := iterator.NewAnd(qs)
and.AddSubIterator(subIt)
and.AddSubIterator(argIt)
it = and
case "back":
arg, _ := obj.Get("_gremlin_back_chain")
argIt := buildIteratorTree(arg.Object(), qs)
and := iterator.NewAnd(qs)
and.AddSubIterator(subIt)
and.AddSubIterator(argIt)
it = and
case "is":
fixed := qs.FixedIterator()
for _, name := range stringArgs {
fixed.Add(qs.ValueOf(name))
}
and := iterator.NewAnd(qs)
and.AddSubIterator(fixed)
and.AddSubIterator(subIt)
it = and
case "or":
arg, _ := obj.Get("_gremlin_values")
firstArg, _ := arg.Object().Get("0")
if !isVertexChain(firstArg.Object()) {
return iterator.NewNull()
}
argIt := buildIteratorTree(firstArg.Object(), qs)
or := iterator.NewOr()
or.AddSubIterator(subIt)
or.AddSubIterator(argIt)
it = or
case "both":
// Hardly the most efficient pattern, but the most general.
// Worth looking into an Optimize() optimization here.
clone := subIt.Clone()
it1 := buildInOutIterator(obj, qs, subIt, false)
it2 := buildInOutIterator(obj, qs, clone, true)
or := iterator.NewOr()
or.AddSubIterator(it1)
or.AddSubIterator(it2)
it = or
case "out":
it = buildInOutIterator(obj, qs, subIt, false)
case "follow":
// Follow a morphism
arg, _ := obj.Get("_gremlin_values")
firstArg, _ := arg.Object().Get("0")
if isVertexChain(firstArg.Object()) {
return iterator.NewNull()
}
it = buildIteratorTreeHelper(firstArg.Object(), qs, subIt)
case "followr":
// Follow a morphism
arg, _ := obj.Get("_gremlin_followr")
if isVertexChain(arg.Object()) {
return iterator.NewNull()
}
it = buildIteratorTreeHelper(arg.Object(), qs, subIt)
case "in":
it = buildInOutIterator(obj, qs, subIt, true)
case "except":
arg, _ := obj.Get("_gremlin_values")
firstArg, _ := arg.Object().Get("0")
if !isVertexChain(firstArg.Object()) {
return iterator.NewNull()
}
allIt := qs.NodesAllIterator()
toComplementIt := buildIteratorTree(firstArg.Object(), qs)
notIt := iterator.NewNot(toComplementIt, allIt)
and := iterator.NewAnd(qs)
and.AddSubIterator(subIt)
and.AddSubIterator(notIt)
it = and
case "in_predicates":
it = buildInOutPredicateIterator(obj, qs, subIt, true)
case "out_predicates":
it = buildInOutPredicateIterator(obj, qs, subIt, false)
}
if it == nil {
panic("Iterator building does not catch the output iterator in some case.")
}
return it
ok = true
return
}