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compiler_expr.go
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3599 lines (3320 loc) · 80.4 KB
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package goja
import (
"math/big"
"github.com/dop251/goja/ast"
"github.com/dop251/goja/file"
"github.com/dop251/goja/token"
"github.com/dop251/goja/unistring"
)
type compiledExpr interface {
emitGetter(putOnStack bool)
emitSetter(valueExpr compiledExpr, putOnStack bool)
emitRef()
emitUnary(prepare, body func(), postfix, putOnStack bool)
emitDelete(putOnStack bool)
constant() bool
addSrcMap()
}
type compiledExprOrRef interface {
compiledExpr
emitGetterOrRef()
}
type compiledCallExpr struct {
baseCompiledExpr
args []compiledExpr
callee compiledExpr
isVariadic bool
}
type compiledNewExpr struct {
compiledCallExpr
}
type compiledObjectLiteral struct {
baseCompiledExpr
expr *ast.ObjectLiteral
}
type compiledArrayLiteral struct {
baseCompiledExpr
expr *ast.ArrayLiteral
}
type compiledRegexpLiteral struct {
baseCompiledExpr
expr *ast.RegExpLiteral
}
type compiledLiteral struct {
baseCompiledExpr
val Value
}
type compiledTemplateLiteral struct {
baseCompiledExpr
tag compiledExpr
elements []*ast.TemplateElement
expressions []compiledExpr
}
type compiledAssignExpr struct {
baseCompiledExpr
left, right compiledExpr
operator token.Token
}
type compiledObjectAssignmentPattern struct {
baseCompiledExpr
expr *ast.ObjectPattern
}
type compiledArrayAssignmentPattern struct {
baseCompiledExpr
expr *ast.ArrayPattern
}
type baseCompiledExpr struct {
c *compiler
offset int
}
type compiledIdentifierExpr struct {
baseCompiledExpr
name unistring.String
}
type compiledAwaitExpression struct {
baseCompiledExpr
arg compiledExpr
}
type compiledYieldExpression struct {
baseCompiledExpr
arg compiledExpr
delegate bool
}
type funcType uint8
const (
funcNone funcType = iota
funcRegular
funcArrow
funcMethod
funcClsInit
funcCtor
funcDerivedCtor
)
type compiledFunctionLiteral struct {
baseCompiledExpr
name *ast.Identifier
parameterList *ast.ParameterList
body []ast.Statement
source string
declarationList []*ast.VariableDeclaration
lhsName unistring.String
strict *ast.StringLiteral
homeObjOffset uint32
typ funcType
isExpr bool
isAsync, isGenerator bool
}
type compiledBracketExpr struct {
baseCompiledExpr
left, member compiledExpr
}
type compiledThisExpr struct {
baseCompiledExpr
}
type compiledSuperExpr struct {
baseCompiledExpr
}
type compiledNewTarget struct {
baseCompiledExpr
}
type compiledSequenceExpr struct {
baseCompiledExpr
sequence []compiledExpr
}
type compiledUnaryExpr struct {
baseCompiledExpr
operand compiledExpr
operator token.Token
postfix bool
}
type compiledConditionalExpr struct {
baseCompiledExpr
test, consequent, alternate compiledExpr
}
type compiledLogicalOr struct {
baseCompiledExpr
left, right compiledExpr
}
type compiledCoalesce struct {
baseCompiledExpr
left, right compiledExpr
}
type compiledLogicalAnd struct {
baseCompiledExpr
left, right compiledExpr
}
type compiledBinaryExpr struct {
baseCompiledExpr
left, right compiledExpr
operator token.Token
}
type compiledEnumGetExpr struct {
baseCompiledExpr
}
type compiledSpreadCallArgument struct {
baseCompiledExpr
expr compiledExpr
}
type compiledOptionalChain struct {
baseCompiledExpr
expr compiledExpr
}
type compiledOptional struct {
baseCompiledExpr
expr compiledExpr
}
func (c *compiler) compileExpression(v ast.Expression) compiledExpr {
// log.Printf("compileExpression: %T", v)
switch v := v.(type) {
case nil:
return nil
case *ast.AssignExpression:
return c.compileAssignExpression(v)
case *ast.NumberLiteral:
return c.compileNumberLiteral(v)
case *ast.StringLiteral:
return c.compileStringLiteral(v)
case *ast.TemplateLiteral:
return c.compileTemplateLiteral(v)
case *ast.BooleanLiteral:
return c.compileBooleanLiteral(v)
case *ast.NullLiteral:
r := &compiledLiteral{
val: _null,
}
r.init(c, v.Idx0())
return r
case *ast.Identifier:
return c.compileIdentifierExpression(v)
case *ast.CallExpression:
return c.compileCallExpression(v)
case *ast.ObjectLiteral:
return c.compileObjectLiteral(v)
case *ast.ArrayLiteral:
return c.compileArrayLiteral(v)
case *ast.RegExpLiteral:
return c.compileRegexpLiteral(v)
case *ast.BinaryExpression:
return c.compileBinaryExpression(v)
case *ast.UnaryExpression:
return c.compileUnaryExpression(v)
case *ast.ConditionalExpression:
return c.compileConditionalExpression(v)
case *ast.FunctionLiteral:
return c.compileFunctionLiteral(v, true)
case *ast.ArrowFunctionLiteral:
return c.compileArrowFunctionLiteral(v)
case *ast.ClassLiteral:
return c.compileClassLiteral(v, true)
case *ast.DotExpression:
return c.compileDotExpression(v)
case *ast.PrivateDotExpression:
return c.compilePrivateDotExpression(v)
case *ast.BracketExpression:
return c.compileBracketExpression(v)
case *ast.ThisExpression:
r := &compiledThisExpr{}
r.init(c, v.Idx0())
return r
case *ast.SuperExpression:
c.throwSyntaxError(int(v.Idx0())-1, "'super' keyword unexpected here")
panic("unreachable")
case *ast.SequenceExpression:
return c.compileSequenceExpression(v)
case *ast.NewExpression:
return c.compileNewExpression(v)
case *ast.MetaProperty:
return c.compileMetaProperty(v)
case *ast.ObjectPattern:
return c.compileObjectAssignmentPattern(v)
case *ast.ArrayPattern:
return c.compileArrayAssignmentPattern(v)
case *ast.OptionalChain:
r := &compiledOptionalChain{
expr: c.compileExpression(v.Expression),
}
r.init(c, v.Idx0())
return r
case *ast.Optional:
r := &compiledOptional{
expr: c.compileExpression(v.Expression),
}
r.init(c, v.Idx0())
return r
case *ast.AwaitExpression:
r := &compiledAwaitExpression{
arg: c.compileExpression(v.Argument),
}
r.init(c, v.Await)
return r
case *ast.YieldExpression:
r := &compiledYieldExpression{
arg: c.compileExpression(v.Argument),
delegate: v.Delegate,
}
r.init(c, v.Yield)
return r
default:
c.assert(false, int(v.Idx0())-1, "Unknown expression type: %T", v)
panic("unreachable")
}
}
func (e *baseCompiledExpr) constant() bool {
return false
}
func (e *baseCompiledExpr) init(c *compiler, idx file.Idx) {
e.c = c
e.offset = int(idx) - 1
}
func (e *baseCompiledExpr) emitSetter(compiledExpr, bool) {
e.c.throwSyntaxError(e.offset, "Not a valid left-value expression")
}
func (e *baseCompiledExpr) emitRef() {
e.c.assert(false, e.offset, "Cannot emit reference for this type of expression")
}
func (e *baseCompiledExpr) emitDelete(putOnStack bool) {
if putOnStack {
e.addSrcMap()
e.c.emitLiteralValue(valueTrue)
}
}
func (e *baseCompiledExpr) emitUnary(func(), func(), bool, bool) {
e.c.throwSyntaxError(e.offset, "Not a valid left-value expression")
}
func (e *baseCompiledExpr) addSrcMap() {
if e.offset >= 0 {
e.c.p.addSrcMap(e.offset)
}
}
func (e *compiledIdentifierExpr) emitGetter(putOnStack bool) {
e.addSrcMap()
if b, noDynamics := e.c.scope.lookupName(e.name); noDynamics {
e.c.assert(b != nil, e.offset, "No dynamics and not found")
if putOnStack {
b.emitGet()
} else {
b.emitGetP()
}
} else {
if b != nil {
b.emitGetVar(false)
} else {
e.c.emit(loadDynamic(e.name))
}
if !putOnStack {
e.c.emit(pop)
}
}
}
func (e *compiledIdentifierExpr) emitGetterOrRef() {
e.addSrcMap()
if b, noDynamics := e.c.scope.lookupName(e.name); noDynamics {
e.c.assert(b != nil, e.offset, "No dynamics and not found")
b.emitGet()
} else {
if b != nil {
b.emitGetVar(false)
} else {
e.c.emit(loadDynamicRef(e.name))
}
}
}
func (e *compiledIdentifierExpr) emitGetterAndCallee() {
e.addSrcMap()
if b, noDynamics := e.c.scope.lookupName(e.name); noDynamics {
e.c.assert(b != nil, e.offset, "No dynamics and not found")
e.c.emit(loadUndef)
b.emitGet()
} else {
if b != nil {
b.emitGetVar(true)
} else {
e.c.emit(loadDynamicCallee(e.name))
}
}
}
func (e *compiledIdentifierExpr) emitVarSetter1(putOnStack bool, emitRight func(isRef bool)) {
e.addSrcMap()
c := e.c
if b, noDynamics := c.scope.lookupName(e.name); noDynamics {
if c.scope.strict {
c.checkIdentifierLName(e.name, e.offset)
}
emitRight(false)
if b != nil {
if putOnStack {
b.emitSet()
} else {
b.emitSetP()
}
} else {
if c.scope.strict {
c.emit(setGlobalStrict(e.name))
} else {
c.emit(setGlobal(e.name))
}
if !putOnStack {
c.emit(pop)
}
}
} else {
c.emitVarRef(e.name, e.offset, b)
emitRight(true)
if putOnStack {
c.emit(putValue)
} else {
c.emit(putValueP)
}
}
}
func (e *compiledIdentifierExpr) emitVarSetter(valueExpr compiledExpr, putOnStack bool) {
e.emitVarSetter1(putOnStack, func(bool) {
e.c.emitNamedOrConst(valueExpr, e.name)
})
}
func (c *compiler) emitVarRef(name unistring.String, offset int, b *binding) {
if c.scope.strict {
c.checkIdentifierLName(name, offset)
}
if b != nil {
b.emitResolveVar(c.scope.strict)
} else {
if c.scope.strict {
c.emit(resolveVar1Strict(name))
} else {
c.emit(resolveVar1(name))
}
}
}
func (e *compiledIdentifierExpr) emitRef() {
b, _ := e.c.scope.lookupName(e.name)
e.c.emitVarRef(e.name, e.offset, b)
}
func (e *compiledIdentifierExpr) emitSetter(valueExpr compiledExpr, putOnStack bool) {
e.emitVarSetter(valueExpr, putOnStack)
}
func (e *compiledIdentifierExpr) emitUnary(prepare, body func(), postfix, putOnStack bool) {
if putOnStack {
e.emitVarSetter1(true, func(isRef bool) {
e.c.emit(loadUndef)
if isRef {
e.c.emit(getValue)
} else {
e.emitGetter(true)
}
if prepare != nil {
prepare()
}
if !postfix {
body()
}
e.c.emit(rdupN(1))
if postfix {
body()
}
})
e.c.emit(pop)
} else {
e.emitVarSetter1(false, func(isRef bool) {
if isRef {
e.c.emit(getValue)
} else {
e.emitGetter(true)
}
body()
})
}
}
func (e *compiledIdentifierExpr) emitDelete(putOnStack bool) {
if e.c.scope.strict {
e.c.throwSyntaxError(e.offset, "Delete of an unqualified identifier in strict mode")
panic("Unreachable")
}
if b, noDynamics := e.c.scope.lookupName(e.name); noDynamics {
if b == nil {
e.addSrcMap()
e.c.emit(deleteGlobal(e.name))
if !putOnStack {
e.c.emit(pop)
}
return
}
} else {
if b == nil {
e.addSrcMap()
e.c.emit(deleteVar(e.name))
if !putOnStack {
e.c.emit(pop)
}
return
}
}
if putOnStack {
e.addSrcMap()
e.c.emitLiteralValue(valueFalse)
}
}
type compiledSuperDotExpr struct {
baseCompiledExpr
name unistring.String
}
func (e *compiledSuperDotExpr) emitGetter(putOnStack bool) {
e.c.emitLoadThis()
e.c.emit(loadSuper)
e.addSrcMap()
e.c.emit(getPropRecv(e.name))
if !putOnStack {
e.c.emit(pop)
}
}
func (e *compiledSuperDotExpr) emitSetter(valueExpr compiledExpr, putOnStack bool) {
e.c.emitLoadThis()
e.c.emit(loadSuper)
valueExpr.emitGetter(true)
e.addSrcMap()
if putOnStack {
if e.c.scope.strict {
e.c.emit(setPropRecvStrict(e.name))
} else {
e.c.emit(setPropRecv(e.name))
}
} else {
if e.c.scope.strict {
e.c.emit(setPropRecvStrictP(e.name))
} else {
e.c.emit(setPropRecvP(e.name))
}
}
}
func (e *compiledSuperDotExpr) emitUnary(prepare, body func(), postfix, putOnStack bool) {
if !putOnStack {
e.c.emitLoadThis()
e.c.emit(loadSuper, dupLast(2), getPropRecv(e.name))
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setPropRecvStrictP(e.name))
} else {
e.c.emit(setPropRecvP(e.name))
}
} else {
if !postfix {
e.c.emitLoadThis()
e.c.emit(loadSuper, dupLast(2), getPropRecv(e.name))
if prepare != nil {
prepare()
}
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setPropRecvStrict(e.name))
} else {
e.c.emit(setPropRecv(e.name))
}
} else {
e.c.emit(loadUndef)
e.c.emitLoadThis()
e.c.emit(loadSuper, dupLast(2), getPropRecv(e.name))
if prepare != nil {
prepare()
}
e.c.emit(rdupN(3))
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setPropRecvStrictP(e.name))
} else {
e.c.emit(setPropRecvP(e.name))
}
}
}
}
func (e *compiledSuperDotExpr) emitRef() {
e.c.emitLoadThis()
e.c.emit(loadSuper)
if e.c.scope.strict {
e.c.emit(getPropRefRecvStrict(e.name))
} else {
e.c.emit(getPropRefRecv(e.name))
}
}
func (c *compiler) emitSuperReferenceError() {
c.emit(throwConst{referenceError("Unsupported reference to 'super'")})
}
func (e *compiledSuperDotExpr) emitDelete(_ bool) {
e.addSrcMap()
e.c.emitSuperReferenceError()
}
type compiledDotExpr struct {
baseCompiledExpr
left compiledExpr
name unistring.String
}
type compiledPrivateDotExpr struct {
baseCompiledExpr
left compiledExpr
name unistring.String
}
func (c *compiler) checkSuperBase(idx file.Idx) {
if s := c.scope.nearestThis(); s != nil {
switch s.funcType {
case funcMethod, funcClsInit, funcCtor, funcDerivedCtor:
return
}
}
c.throwSyntaxError(int(idx)-1, "'super' keyword unexpected here")
panic("unreachable")
}
func (c *compiler) compileDotExpression(v *ast.DotExpression) compiledExpr {
if sup, ok := v.Left.(*ast.SuperExpression); ok {
c.checkSuperBase(sup.Idx)
r := &compiledSuperDotExpr{
name: v.Identifier.Name,
}
r.init(c, v.Identifier.Idx)
return r
}
r := &compiledDotExpr{
left: c.compileExpression(v.Left),
name: v.Identifier.Name,
}
r.init(c, v.Identifier.Idx)
return r
}
func (c *compiler) compilePrivateDotExpression(v *ast.PrivateDotExpression) compiledExpr {
r := &compiledPrivateDotExpr{
left: c.compileExpression(v.Left),
name: v.Identifier.Name,
}
r.init(c, v.Identifier.Idx)
return r
}
func (e *compiledPrivateDotExpr) _emitGetter(rn *resolvedPrivateName, id *privateId) {
if rn != nil {
e.c.emit((*getPrivatePropRes)(rn))
} else {
e.c.emit((*getPrivatePropId)(id))
}
}
func (e *compiledPrivateDotExpr) _emitSetter(rn *resolvedPrivateName, id *privateId) {
if rn != nil {
e.c.emit((*setPrivatePropRes)(rn))
} else {
e.c.emit((*setPrivatePropId)(id))
}
}
func (e *compiledPrivateDotExpr) _emitSetterP(rn *resolvedPrivateName, id *privateId) {
if rn != nil {
e.c.emit((*setPrivatePropResP)(rn))
} else {
e.c.emit((*setPrivatePropIdP)(id))
}
}
func (e *compiledPrivateDotExpr) emitGetter(putOnStack bool) {
e.left.emitGetter(true)
e.addSrcMap()
rn, id := e.c.resolvePrivateName(e.name, e.offset)
e._emitGetter(rn, id)
if !putOnStack {
e.c.emit(pop)
}
}
func (e *compiledPrivateDotExpr) emitSetter(v compiledExpr, putOnStack bool) {
rn, id := e.c.resolvePrivateName(e.name, e.offset)
e.left.emitGetter(true)
v.emitGetter(true)
e.addSrcMap()
if putOnStack {
e._emitSetter(rn, id)
} else {
e._emitSetterP(rn, id)
}
}
func (e *compiledPrivateDotExpr) emitUnary(prepare, body func(), postfix, putOnStack bool) {
rn, id := e.c.resolvePrivateName(e.name, e.offset)
if !putOnStack {
e.left.emitGetter(true)
e.c.emit(dup)
e._emitGetter(rn, id)
body()
e.addSrcMap()
e._emitSetterP(rn, id)
} else {
if !postfix {
e.left.emitGetter(true)
e.c.emit(dup)
e._emitGetter(rn, id)
if prepare != nil {
prepare()
}
body()
e.addSrcMap()
e._emitSetter(rn, id)
} else {
e.c.emit(loadUndef)
e.left.emitGetter(true)
e.c.emit(dup)
e._emitGetter(rn, id)
if prepare != nil {
prepare()
}
e.c.emit(rdupN(2))
body()
e.addSrcMap()
e._emitSetterP(rn, id)
}
}
}
func (e *compiledPrivateDotExpr) emitDelete(_ bool) {
e.c.throwSyntaxError(e.offset, "Private fields can not be deleted")
}
func (e *compiledPrivateDotExpr) emitRef() {
e.left.emitGetter(true)
rn, id := e.c.resolvePrivateName(e.name, e.offset)
if rn != nil {
e.c.emit((*getPrivateRefRes)(rn))
} else {
e.c.emit((*getPrivateRefId)(id))
}
}
type compiledSuperBracketExpr struct {
baseCompiledExpr
member compiledExpr
}
func (e *compiledSuperBracketExpr) emitGetter(putOnStack bool) {
e.c.emitLoadThis()
e.member.emitGetter(true)
e.c.emit(loadSuper)
e.addSrcMap()
e.c.emit(getElemRecv)
if !putOnStack {
e.c.emit(pop)
}
}
func (e *compiledSuperBracketExpr) emitSetter(valueExpr compiledExpr, putOnStack bool) {
e.c.emitLoadThis()
e.member.emitGetter(true)
e.c.emit(loadSuper)
valueExpr.emitGetter(true)
e.addSrcMap()
if putOnStack {
if e.c.scope.strict {
e.c.emit(setElemRecvStrict)
} else {
e.c.emit(setElemRecv)
}
} else {
if e.c.scope.strict {
e.c.emit(setElemRecvStrictP)
} else {
e.c.emit(setElemRecvP)
}
}
}
func (e *compiledSuperBracketExpr) emitUnary(prepare, body func(), postfix, putOnStack bool) {
if !putOnStack {
e.c.emitLoadThis()
e.member.emitGetter(true)
e.c.emit(loadSuper, dupLast(3), getElemRecv)
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setElemRecvStrictP)
} else {
e.c.emit(setElemRecvP)
}
} else {
if !postfix {
e.c.emitLoadThis()
e.member.emitGetter(true)
e.c.emit(loadSuper, dupLast(3), getElemRecv)
if prepare != nil {
prepare()
}
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setElemRecvStrict)
} else {
e.c.emit(setElemRecv)
}
} else {
e.c.emit(loadUndef)
e.c.emitLoadThis()
e.member.emitGetter(true)
e.c.emit(loadSuper, dupLast(3), getElemRecv)
if prepare != nil {
prepare()
}
e.c.emit(rdupN(4))
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setElemRecvStrictP)
} else {
e.c.emit(setElemRecvP)
}
}
}
}
func (e *compiledSuperBracketExpr) emitRef() {
e.c.emitLoadThis()
e.member.emitGetter(true)
e.c.emit(loadSuper)
if e.c.scope.strict {
e.c.emit(getElemRefRecvStrict)
} else {
e.c.emit(getElemRefRecv)
}
}
func (e *compiledSuperBracketExpr) emitDelete(_ bool) {
e.addSrcMap()
e.c.emitSuperReferenceError()
}
func (c *compiler) checkConstantString(expr compiledExpr) (unistring.String, bool) {
if expr.constant() {
if val, ex := c.evalConst(expr); ex == nil {
if s, ok := val.(String); ok {
return s.string(), true
}
}
}
return "", false
}
func (c *compiler) compileBracketExpression(v *ast.BracketExpression) compiledExpr {
if sup, ok := v.Left.(*ast.SuperExpression); ok {
c.checkSuperBase(sup.Idx)
member := c.compileExpression(v.Member)
if name, ok := c.checkConstantString(member); ok {
r := &compiledSuperDotExpr{
name: name,
}
r.init(c, v.LeftBracket)
return r
}
r := &compiledSuperBracketExpr{
member: member,
}
r.init(c, v.LeftBracket)
return r
}
left := c.compileExpression(v.Left)
member := c.compileExpression(v.Member)
if name, ok := c.checkConstantString(member); ok {
r := &compiledDotExpr{
left: left,
name: name,
}
r.init(c, v.LeftBracket)
return r
}
r := &compiledBracketExpr{
left: left,
member: member,
}
r.init(c, v.LeftBracket)
return r
}
func (e *compiledDotExpr) emitGetter(putOnStack bool) {
e.left.emitGetter(true)
e.addSrcMap()
e.c.emit(getProp(e.name))
if !putOnStack {
e.c.emit(pop)
}
}
func (e *compiledDotExpr) emitRef() {
e.left.emitGetter(true)
if e.c.scope.strict {
e.c.emit(getPropRefStrict(e.name))
} else {
e.c.emit(getPropRef(e.name))
}
}
func (e *compiledDotExpr) emitSetter(valueExpr compiledExpr, putOnStack bool) {
e.left.emitGetter(true)
valueExpr.emitGetter(true)
e.addSrcMap()
if e.c.scope.strict {
if putOnStack {
e.c.emit(setPropStrict(e.name))
} else {
e.c.emit(setPropStrictP(e.name))
}
} else {
if putOnStack {
e.c.emit(setProp(e.name))
} else {
e.c.emit(setPropP(e.name))
}
}
}
func (e *compiledDotExpr) emitUnary(prepare, body func(), postfix, putOnStack bool) {
if !putOnStack {
e.left.emitGetter(true)
e.c.emit(dup)
e.c.emit(getProp(e.name))
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setPropStrictP(e.name))
} else {
e.c.emit(setPropP(e.name))
}
} else {
if !postfix {
e.left.emitGetter(true)
e.c.emit(dup)
e.c.emit(getProp(e.name))
if prepare != nil {
prepare()
}
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setPropStrict(e.name))
} else {
e.c.emit(setProp(e.name))
}
} else {
e.c.emit(loadUndef)
e.left.emitGetter(true)
e.c.emit(dup)
e.c.emit(getProp(e.name))
if prepare != nil {
prepare()
}
e.c.emit(rdupN(2))
body()
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(setPropStrictP(e.name))
} else {
e.c.emit(setPropP(e.name))
}
}
}
}
func (e *compiledDotExpr) emitDelete(putOnStack bool) {
e.left.emitGetter(true)
e.addSrcMap()
if e.c.scope.strict {
e.c.emit(deletePropStrict(e.name))
} else {
e.c.emit(deleteProp(e.name))
}