Add tests for grammarAwareFormatting setting

[JessicaJHee]

Signed-off-by: Jessica He jhe@redhat.com

[angelozerr]

@JessicaJHee it should be nice to have the same test for DTD and XSD and for method name you use the same for test in XSD and DTD test.

I suggest that you replace the foo.dtd with foo-mixed.dtd and your XSD file name with foo-mixed.xsd. Those DTD and XSD should have the same grammar rule.

[angelozerr]

Do you cover with your tests the 2 usecases:

• https://github.com/eclipse/lemminx/blob/e4292ef6b548d44baebc6836ac66981894c93773/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/extensions/contentmodel/participants/ContentModelFormatterParticipant.java#L63
• https://github.com/eclipse/lemminx/blob/e4292ef6b548d44baebc6836ac66981894c93773/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/extensions/contentmodel/participants/ContentModelFormatterParticipant.java#L60

?

[angelozerr]

It should be nice too to support RelaxNG test too (one test foor RlaxNF XML syntax and one test for RelaxNG compact syntax). I wil try to implement

CMRelaxNGElementDeclaration

like this:

public boolean isMixedContent() {
	return pattern.getContentType() == Pattern.MIXED_CONTENT_TYPE;
}

To implement isStringType, we need to study how it works.

It seems that you need to use mixed in the grammar:

• see section 15. Non-restrictions for compact syntax at https://relaxng.org/compact-tutorial.html
• see mixed in https://relaxng.org/spec-20011203.html

[angelozerr]

LGTM. Thanks @JessicaJHee

[angelozerr]

@enxio this PR fixes some little bug with experimental formatter. Please re-install vscode-xml prerelease if you wish to continue to test experimental formatter.