Add support for textDocument/completion for types definition in XML Schema

[angelozerr]

Fix #451

Signed-off-by: azerr [email protected]

[angelozerr]

To test this PR I suggest to tes it with:

• https:/angelozerr/lsp4xml/blob/master/org.eclipse.lsp4xml/src/main/resources/schemas/xsd/XMLSchema.xsd and
• https://maven.apache.org/xsd/maven-4.0.0.xsd

Completion are triggered from

• type attribute (ex : xs:element type=). This attribute reference complex and simple type
• base attribute (ex : xs:extension base=) This attribute reference complex type if parent is complexType or complexContent and simple type if parent is simpleType or simpleContent
• `ref attribute (ex : xs:element ref= ) This attribute reference an xs:element (and xs:group reference a xs:group)

[NikolasKomonen]

Not sure if it is this PR. But when I do completion for the attribute type

<xs:element ... ty|>

The cursor should appear inside the quotations:

<xs:element ... type="|">

Right now the cursor is after the quotes:

<xs:element ... type=""|>

[angelozerr]

@NikolasKomonen this behaviour already existed. The generated attribute in this case is type="$1"$0 where $0 is the cursor. The basic idea is to set the cursor after quote to fill another attributes. See https:/angelozerr/lsp4xml/blob/master/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/utils/XMLGenerator.java#L211

If you don't like this behaviour, please create a new issue for that and we will discuss about it.

[NikolasKomonen]

Everything works great for me. Good work!

[angelozerr]

Thanks Nick for tout review. @xorye please give me feedback too if you have time to play with this pr

[angelozerr]

Thanks @NikolasKomonen for your review