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Refactoring/cleanup/fixes.

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This commit is contained in:
Alex Roitman 2019-06-11 17:13:33 -07:00
parent d0ca579f5c
commit 496ace25d3
3 changed files with 160 additions and 111 deletions
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246
internal/server/expression.go
View File

@ -12,6 +12,11 @@ const (
NOOP BinaryOp = iota
AND
OR
tokenAND = "and"
tokenOR = "or"
tokenNOT = "not"
tokenLParen = "("
tokenRParen = ")"
)
// areaExpression is either an object or operator+children
@ -24,169 +29,214 @@ type areaExpression struct {
type children []*areaExpression
func (e *areaExpression) String() string {
func (e *areaExpression) String() (res string) {
if e.obj != nil {
return e.obj.String()
res = e.obj.String()
} else {
var chStrings []string
for _, c := range e.children {
chStrings = append(chStrings, c.String())
}
switch e.op {
case NOOP:
res = "empty operator"
case AND:
res = "(" + strings.Join(chStrings, " "+tokenAND+" ") + ")"
case OR:
res = "(" + strings.Join(chStrings, " "+tokenOR+" ") + ")"
default:
res = "unknown operator"
}
}
var chStrings []string
for _, c := range e.children {
chStrings = append(chStrings, c.String())
if e.negate {
res = tokenNOT + " " + res
}
switch e.op {
case NOOP:
return "empty operator"
case AND:
return "(" + strings.Join(chStrings, " AND ") + ")"
case OR:
return "(" + strings.Join(chStrings, " OR ") + ")"
}
return "unknown operator"
return
}
// Return boolean value modulo negate field of the expression.
func (e *areaExpression) booleanize(val bool) bool {
func (e *areaExpression) maybeNegate(val bool) bool {
if e.negate {
return !val
}
return val
}
func (e *areaExpression) Intersects(o geojson.Object) bool {
// Methods for testing an areaExpression against the spatial object
func (e *areaExpression) rawIntersects(o geojson.Object) bool {
if e.obj != nil {
return e.booleanize(e.obj.Intersects(o))
return e.obj.Intersects(o)
}
switch e.op {
case AND:
for _, c := range e.children {
if !c.Intersects(o) {
return e.booleanize(false)
return false
}
}
return e.booleanize(true)
return true
case OR:
for _, c := range e.children {
if c.Intersects(o) {
return e.booleanize(true)
return true
}
}
return e.booleanize(false)
return false
}
return e.booleanize(false)
return false
}
// object within an expression means anything of this expression contains object
func (e *areaExpression) Contains(o geojson.Object) bool {
func (e *areaExpression) rawContains(o geojson.Object) bool {
if e.obj != nil {
return e.booleanize(e.obj.Contains(o))
return e.obj.Contains(o)
}
switch e.op {
case AND:
for _, c:= range e.children {
if !c.Contains(o) {
return e.booleanize(false)
return false
}
}
return e.booleanize(true)
return true
case OR:
for _, c:= range e.children {
if c.Contains(o) {
return e.booleanize(true)
return true
}
}
return e.booleanize(false)
return false
}
return e.booleanize(false)
return false
}
func (e *areaExpression) Within(o geojson.Object) bool {
func (e *areaExpression) rawWithin(o geojson.Object) bool {
if e.obj != nil {
return e.booleanize(e.obj.Within(o))
return e.obj.Within(o)
}
switch e.op {
case AND:
for _, c:= range e.children {
if !c.Within(o) {
return e.booleanize(false)
return false
}
}
return e.booleanize(true)
return true
case OR:
for _, c:= range e.children {
if c.Within(o) {
return e.booleanize(true)
return true
}
}
return e.booleanize(false)
return false
}
return e.booleanize(false)
return false
}
func (e *areaExpression) Intersects(o geojson.Object) bool {
return e.maybeNegate(e.rawIntersects(o))
}
func (e *areaExpression) Contains(o geojson.Object) bool {
return e.maybeNegate(e.rawContains(o))
}
func (e *areaExpression) Within(o geojson.Object) bool {
return e.maybeNegate(e.rawWithin(o))
}
// Methods for testing an areaExpression against another areaExpression
func (e *areaExpression) rawIntersectsExpr(oe *areaExpression) bool {
if oe.negate {
e2 := &areaExpression{negate:!e.negate, obj:e.obj, op: e.op, children:e.children}
oe2 := &areaExpression{negate:false, obj:oe.obj, op:oe.op, children:oe.children}
return e2.rawIntersectsExpr(oe2)
}
if oe.obj != nil {
return e.Intersects(oe.obj)
}
switch oe.op {
case AND:
for _, c := range oe.children {
if !e.rawIntersectsExpr(c) {
return false
}
}
return true
case OR:
for _, c := range oe.children {
if e.rawIntersectsExpr(c) {
return true
}
}
return false
}
return false
}
func (e *areaExpression) rawWithinExpr(oe *areaExpression) bool {
if oe.negate {
e2 := &areaExpression{negate:!e.negate, obj:e.obj, op: e.op, children:e.children}
oe2 := &areaExpression{negate:false, obj:oe.obj, op:oe.op, children:oe.children}
return e2.rawWithinExpr(oe2)
}
if oe.obj != nil {
return e.Within(oe.obj)
}
switch oe.op {
case AND:
for _, c:= range oe.children {
if !e.rawWithinExpr(c) {
return false
}
}
return true
case OR:
for _, c:= range oe.children {
if e.rawWithinExpr(c) {
return true
}
}
return false
}
return false
}
func (e *areaExpression) rawContainsExpr(oe *areaExpression) bool {
if oe.negate {
e2 := &areaExpression{negate:!e.negate, obj:e.obj, op: e.op, children:e.children}
oe2 := &areaExpression{negate:false, obj:oe.obj, op:oe.op, children:oe.children}
return e2.rawContainsExpr(oe2)
}
if oe.obj != nil {
return e.Contains(oe.obj)
}
switch oe.op {
case AND:
for _, c:= range oe.children {
if !e.rawContainsExpr(c) {
return false
}
}
return true
case OR:
for _, c:= range oe.children {
if e.rawContainsExpr(c) {
return true
}
}
return false
}
return false
}
func (e *areaExpression) IntersectsExpr(oe *areaExpression) bool {
if oe.obj != nil {
return oe.booleanize(e.Intersects(oe.obj))
}
switch oe.op {
case AND:
for _, c := range oe.children {
if !e.IntersectsExpr(c) {
return e.booleanize(false)
}
}
return e.booleanize(true)
case OR:
for _, c := range oe.children {
if e.IntersectsExpr(c) {
return e.booleanize(true)
}
}
return e.booleanize(false)
}
return e.booleanize(false)
return e.maybeNegate(e.rawIntersectsExpr(oe))
}
func (e *areaExpression) WithinExpr(oe *areaExpression) bool {
if oe.obj != nil {
return oe.booleanize(e.Within(oe.obj))
}
switch oe.op {
case AND:
for _, c:= range oe.children {
if !e.WithinExpr(c) {
return e.booleanize(false)
}
}
return e.booleanize(true)
case OR:
for _, c:= range oe.children {
if e.WithinExpr(c) {
return e.booleanize(true)
}
}
return e.booleanize(false)
}
return e.booleanize(false)
return e.maybeNegate(e.rawWithinExpr(oe))
}
func (e *areaExpression) ContainsExpr(oe *areaExpression) bool {
if oe.obj != nil {
return oe.booleanize(e.Contains(oe.obj))
}
switch oe.op {
case AND:
for _, c:= range oe.children {
if !e.ContainsExpr(c) {
return e.booleanize(false)
}
}
return e.booleanize(true)
case OR:
for _, c:= range oe.children {
if e.ContainsExpr(c) {
return e.booleanize(true)
}
}
return e.booleanize(false)
}
return e.booleanize(false)
return e.maybeNegate(e.rawContainsExpr(oe))
}

24
internal/server/token.go
View File

@ -720,7 +720,7 @@ loop:
break
}
switch strings.ToLower(wtok) {
case "(":
case tokenLParen:
newExpr := &areaExpression{negate: negate, op: NOOP}
negate = false
if ae != nil {
@ -729,28 +729,28 @@ loop:
}
ae = newExpr
vsout = nvs
case ")":
case tokenRParen:
if negate {
err = errInvalidArgument("NOT")
err = errInvalidArgument(tokenNOT)
return
}
if parent, empty := ps.pop(); empty {
err = errInvalidArgument(")")
err = errInvalidArgument(tokenRParen)
return
} else {
ae = parent
}
vsout = nvs
case "not":
case tokenNOT:
negate = true
vsout = nvs
case "and":
case tokenAND:
if negate {
err = errInvalidArgument("NOT")
err = errInvalidArgument(tokenNOT)
return
}
if ae == nil {
err = errInvalidArgument("AND")
err = errInvalidArgument(tokenAND)
return
} else if ae.obj == nil {
switch ae.op {
@ -773,13 +773,13 @@ loop:
ae = &areaExpression{op: AND, children: []*areaExpression{ae}}
}
vsout = nvs
case "or":
case tokenOR:
if negate {
err = errInvalidArgument("NOT")
err = errInvalidArgument(tokenNOT)
return
}
if ae == nil {
err = errInvalidArgument("OR")
err = errInvalidArgument(tokenOR)
return
} else if ae.obj == nil {
switch ae.op {
@ -820,7 +820,7 @@ loop:
}
default:
if negate {
err = errInvalidArgument("NOT")
err = errInvalidArgument(tokenNOT)
return
}
break loop

1
tests/testcmd_test.go
View File

@ -162,5 +162,4 @@ func testcmd_expression_test(mc *mockServer) error {
"(", "OBJECT", poly, "AND", "NOT", "GET", "mykey", "line3", ")"}, {"1"},
{"TEST", "OBJECT", poly9, "WITHIN", "NOT", "GET", "mykey", "line3"}, {"1"},
})
}