J'ai trouvé une façon de représenter l'expression a.b[c.d][e].f[g[h[i.j]]]
en utilisant ma propre forme d'arbre. Cette expression, représenté comme un arbre, qui ressemble à ceci:
{
"form": "nest",
"link": [
{
"form": "site",
"name": "a"
},
{
"form": "site",
"name": "b"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "c"
},
{
"form": "site",
"name": "d"
}
]
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "e"
}
]
},
{
"form": "site",
"name": "f"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "g"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "h"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "i"
},
{
"form": "site",
"name": "j"
}
]
}
]
}
]
}
]
}
Maintenant, la même expression de chaîne est également représentée par la JS AST structure arborescente pour le MemberExpression
:
{
"type": "MemberExpression",
"object": {
"type": "MemberExpression",
"object": {
"type": "MemberExpression",
"object": {
"type": "MemberExpression",
"object": {
"type": "MemberExpression",
"object": {
"type": "Identifier",
"name": "a"
},
"property": {
"type": "Identifier",
"name": "b"
},
"computed": false
},
"property": {
"type": "MemberExpression",
"object": {
"type": "Identifier",
"name": "c"
},
"property": {
"type": "Identifier",
"name": "d"
},
"computed": false
},
"computed": true
},
"property": {
"type": "Identifier",
"name": "e"
},
"computed": true
},
"property": {
"type": "Identifier",
"name": "f"
},
"computed": false
},
"property": {
"type": "MemberExpression",
"object": {
"type": "Identifier",
"name": "g"
},
"property": {
"type": "MemberExpression",
"object": {
"type": "Identifier",
"name": "h"
},
"property": {
"type": "MemberExpression",
"object": {
"type": "Identifier",
"name": "i"
},
"property": {
"type": "Identifier",
"name": "j"
},
"computed": false
},
"computed": true
},
"computed": true
},
"computed": true
}
Donc, ces deux structures en arbre représentent la même expression de chaîne a.b[c.d][e].f[g[h[i.j]]]
. Vous remarquerez sur la première "nid" de la structure, il y a deux types d'objets, des sites et des nids. Un site est juste un nom, tandis qu'un nid à "calculé" de la propriété en JS AST terminologie. Si un nid est comme parent[this_is_a_nest[and_another_nest]]
tandis que parent.site1.site2
.
Comment transformer la première structure de l'arbre dans le second?
Ce que j'ai à ce jour n'est pas vraiment y arriver, c'est assez déroutant.
console.log(JSON.stringify(transform(getNest()), null, 2))
function transform(nest) {
let i = 0
let stack = []
while (i < nest.link.length) {
let object = nest.link[i++]
let property = nest.link[i]
let member = {
type: 'MemberExpression'
}
stack.push(member)
if (object.form === 'nest') {
member.object = transform(object)
} else {
member.object = {
type: 'Identifier',
name: object.name
}
}
if (property) {
if (property.form === 'nest') {
member.property = transform(property)
member.computed = true
} else {
member.property = {
type: 'Identifier',
name: property.name
}
}
}
}
let object = stack.pop()
while (stack.length) {
let nextObject = stack.pop()
nextObject.object = object
object = nextObject
}
return object
}
function getNest() {
return {
"form": "nest",
"link": [
{
"form": "site",
"name": "a"
},
{
"form": "site",
"name": "b"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "c"
},
{
"form": "site",
"name": "d"
}
]
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "e"
}
]
},
{
"form": "site",
"name": "f"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "g"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "h"
},
{
"form": "nest",
"link": [
{
"form": "site",
"name": "i"
},
{
"form": "site",
"name": "j"
}
]
}
]
}
]
}
]
}
}
Ne sais pas vraiment comment simplifier le problème en une manière de le résoudre encore.
Je ne sais pas si c' est de toute aide (acornjs analyseur pour MemberExpression).