@Override
public void visitXmlProcessingInstruction(XmlProcessingInstruction processingInstruction) {
super.visitXmlProcessingInstruction(processingInstruction);
PsiElement parent = processingInstruction.getParent();
if (parent instanceof XmlProlog && processingInstruction.getText().startsWith("<?xml")) {
for (PsiElement e = PsiTreeUtil.prevLeaf(processingInstruction);
e != null;
e = PsiTreeUtil.prevLeaf(e)) {
if (e instanceof PsiWhiteSpace && PsiTreeUtil.prevLeaf(e) != null
|| e instanceof OuterLanguageElement) {
continue;
}
PsiElement eParent = e.getParent();
if (eParent instanceof PsiComment) e = eParent;
if (eParent instanceof XmlProcessingInstruction) break;
addToResults(
HighlightInfo.createHighlightInfo(
HighlightInfoType.ERROR,
e,
XmlErrorMessages.message("xml.declaration.should.precede.all.document.content")));
}
}
}
public void accept(@NotNull PsiElementVisitor visitor) {
if (visitor instanceof XmlElementVisitor) {
((XmlElementVisitor) visitor).visitXmlDocument(this);
} else {
visitor.visitElement(this);
}
}