Add PsiElement to another

I've updated my method findFactoriesValuesArray which now return the last ArrayHashElement:

private fun findFactoriesValuesArray(file: PsiFile): PsiElement? {
    val phpReturn = PsiTreeUtil.findChildOfType(file, PhpReturn::class.java)
    if (phpReturn != null) {
        val arrayCreation: PhpPsiElement? = phpReturn.firstPsiChild
        if (arrayCreation is ArrayCreationExpression) {
            for (hashElement in PsiTreeUtil.getChildrenOfTypeAsList(arrayCreation, ArrayHashElement::class.java)) {
                val arrayKey = hashElement.key

                if (arrayKey is StringLiteralExpression && arrayKey.text == "'factories'") {
                    val arrayValue = hashElement.value
                    val lastArrayHashElement: PsiElement = arrayValue!!.children[arrayValue.children.size - 1]
                    if (lastArrayHashElement is ArrayHashElement) {
                        return lastArrayHashElement
                    }
                }
            }
        }
    }
    return null
}

The output is:

<?php
<?php


namespace Intranet;



return [
    Model\Application\Query\Search\FindApplicationForUser::class => 'test',
    'factories' => [
        // Api
        Model\Infrastructure\Api\Adapter::class => Model\Infrastructure\Api\AdapterFactory::class,
        // Command
        Model\Application\Command\Application\CreateApplication::class => Model\Application\Command\Application\CreateApplicationFactory::class'test => test',


    ],
    'foo' => [
    'bar' => 'baz'
],
];

So my string is added to the end of line of the last ArrayHashElement but I need to add a comma and a new line.

PS : I don't know why the ouput contain two PHP open tag.

Please do not create multiple threads for the same problem. https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004324519-Add-some-code-to-a-file?page=1#community_comment_360000662460

Please try creating "," as separate element and append it before appending new array element

Thank you for your reply.

I add the comma like this: (It's work, after that I will need to check if the comma exists and add it if not the case)

val arrayCreation = findFactoriesValuesArray(psiFile)

if (arrayCreation != null) {

    val comma: PsiElement = PhpPsiElementFactory.createComma(event.project!!)
    val arrayHashElement: PsiElement = PhpPsiElementFactory.createPhpPsiFromText(event.project!!, PhpElementTypes.ARRAY_HASH_ELEMENT, "'test' => 'test'")
    arrayCreation.add(comma)
    comma.add(arrayHashElement)
    println(psiFile.text)
}

The same exception is thrown:

java.lang.AssertionError: cannot create element from text:
<?php
'test' => 'test'
at com.jetbrains.php.lang.psi.PhpPsiElementFactory.createPhpPsiFromText(PhpPsiElementFactory.java:272)

The PsiTreeView plugin tell me an ArrayHashElement has a key => value as text

I really don't know why an exception is thrown.

I really need help. 4 evening and still not the Psi I want.

var hashArrayElement: ArrayHashElement? = findFactoriesValuesArray(psiFile) as ArrayHashElement

if (hashArrayElement != null) {

    // add comma
    // add hash array element
    hashArrayElement.parent.addAfter(PhpPsiElementFactory.createFromText(event.project!!, PhpElementTypes.HASH_ARRAY_ELEMENT, "'test' => 'test"), hashArrayElement)
}

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'element' of com/intellij/extapi/psi/ASTDelegatePsiElement.addAfter must not be null
at com.intellij.extapi.psi.ASTDelegatePsiElement.$$$reportNull$$$0(ASTDelegatePsiElement.java)
at com.intellij.extapi.psi.ASTDelegatePsiElement.addAfter(ASTDelegatePsiElement.java)

Why the element parameter is null?

PhpPsiElementFactory.createFromText(event.project!!, PhpElementTypes.HASH_ARRAY_ELEMENT, "'test' => 'test")

What is the correct way to create a HashArrayElement from text?

I don't understand at all how to add a HashArrayElement to my psi element.

I found something but I don't think it's the best way to do.

if (hashArrayElement != null) {

    WriteCommandAction.runWriteCommandAction(event.project!!) {
        val createKey: PsiElement? = PhpPsiElementFactory.createFromText(event.project!!, ClassConstantReference::class.java, "Model\\Application\\Command\\test::class")
        val createArrow: PsiElement? = PhpPsiElementFactory.createFromText(event.project!!, LeafPsiElement::class.java, "=>")
        val createValue: PsiElement? = PhpPsiElementFactory.createFromText(event.project!!, ClassConstantReference::class.java, "Model\\Application\\Command\\toto::class")

        val comma = hashArrayElement.parent.addAfter(PhpPsiElementFactory.createComma(event.project!!), hashArrayElement)
        val arrayKey = hashArrayElement.parent.addAfter(createKey!!, comma)
        val arrow = hashArrayElement.parent.addAfter(createArrow!!, arrayKey)
        hashArrayElement.parent.addAfter(createValue!!, arrow)
        CodeStyleManager.getInstance(event.project!!).reformat(psiFile1)
    }
}

It's working, but why the reformat method don't add a new line after the comma?

It's possible to refactor this code?