How do I properly use IdeContentProposalProvider for xtext web editor - dsl

Question

I am having trouble getting my proposal provider to work properly. My objective is to provide a list of all possible imports a user can create. I can verify that the class is bound properly and is getting called on assist request from the editor. I can even see proposals being created and passed to the acceptor but nothing shows up in the editor.
So my question may be two part:
Can you see what I may be doing wrong in the following code as to explain content assist not showing in the editor
Can you explain the difference between the dispatch methods for Assignment, RuleCall, and Keyword? I find that all three methods are hit for the same content assist request, so what exactly do I code differently and what do they do differently?
Also I am using CodeMirror if that has any effect.
class mydslContentAssist extends IdeContentProposalProvider{
#Inject extension mydslGrammarAccess stAccess
#Inject mydslGlobalScopeProvider sp
#Inject extension IQualifiedNameProvider
override dispatch createProposals(Assignment assignment, ContentAssistContext context, IIdeContentProposalAcceptor acceptor) {
switch(assignment) {
case stAccess.libraryModelAccess.importsAssignment_0: {
var libs = sp.descriptionData.getExportedObjectsByType(ModelPackage.eINSTANCE.libraryModel)
for (lib : libs.filter[(EObjectOrProxy as LibraryModel).name.startsWith(context.prefix)]) {
var proposal = proposalCreator.createProposal('import ' + (lib.EObjectOrProxy as LibraryModel).name + ".*;", context) [
source = lib
description = "import entire library contents"
]
acceptor.accept(proposal, proposalPriorities.getDefaultPriority(proposal))
}
}
default : {
super._createProposals(assignment, context, acceptor)
}
}
}
override dispatch createProposals(RuleCall rulecall, ContentAssistContext context, IIdeContentProposalAcceptor acceptor) {
switch(rulecall.rule) {
case importRule: {
var libs = sp.descriptionData.getExportedObjectsByType(ModelPackage.eINSTANCE.libraryModel)
for (lib : libs) {
var proposal = proposalCreator.createProposal('import ' + (lib.EObjectOrProxy as LibraryModel).name + ".*;", context) [
source = lib
description = "import entire library contents"
]
acceptor.accept(proposal, proposalPriorities.getDefaultPriority(proposal))
}
}
default : {
super._createProposals(rulecall, context, acceptor)
}
}
}
override dispatch createProposals(Keyword keyword, ContentAssistContext context, IIdeContentProposalAcceptor acceptor) {
switch (keyword) {
case stAccess.importAccess.importKeyword_0: {
var libs = sp.descriptionData.getExportedObjectsByType(ModelPackage.eINSTANCE.libraryModel)
for (lib : libs) {
var proposal = proposalCreator.createProposal('import ' + (lib.EObjectOrProxy as LibraryModel).name + ".*;", context) [
source = lib
description = "import entire library contents"
]
acceptor.accept(proposal, proposalPriorities.getDefaultPriority(proposal))
}
}
default: {
super._createProposals(keyword, context, acceptor)
}
}
}
}
EDIT: My code is only being hit when calling content assist when typing the 'import' keyword. But not when typing the importedNamespace string

Answer 1

i gave it a try and could not reproduce
grammar:
Model:
imports+=Import*;
Import: 'import' importedNamespace=QualifiedNameWithWildcard ';'
;
QualifiedNameWithWildcard:
ID ("." ID)* (".*")?
;
and impl
package org.xtext.example.mydsl.web
import com.google.inject.Inject
import org.eclipse.xtext.Assignment
import org.eclipse.xtext.Keyword
import org.eclipse.xtext.RuleCall
import org.eclipse.xtext.ide.editor.contentassist.ContentAssistContext
import org.eclipse.xtext.ide.editor.contentassist.IIdeContentProposalAcceptor
import org.eclipse.xtext.ide.editor.contentassist.IdeContentProposalProvider
import org.eclipse.xtext.naming.IQualifiedNameProvider
import org.xtext.example.mydsl.services.MyDslGrammarAccess
class MydslContentAssist extends IdeContentProposalProvider {
#Inject extension MyDslGrammarAccess stAccess
static val LIBS = #[
"XX1", "XX2", "YY1", "YY2"
]
override dispatch createProposals(Assignment assignment, ContentAssistContext context, IIdeContentProposalAcceptor acceptor) {
switch(assignment) {
case stAccess.importAccess.importedNamespaceAssignment_1: {
for (lib : LIBS.filter[it.startsWith(context.prefix)]) {
var proposal = proposalCreator.createProposal(lib + ".*;", context) [
source = lib
description = "import entire library contents"
]
acceptor.accept(proposal, proposalPriorities.getDefaultPriority(proposal))
}
}
default : {
super._createProposals(assignment, context, acceptor)
}
}
}
override dispatch createProposals(RuleCall rulecall, ContentAssistContext context, IIdeContentProposalAcceptor acceptor) {
switch(rulecall.rule) {
case importRule: {
for (lib : LIBS) {
var proposal = proposalCreator.createProposal('import ' + lib + ".*;", context) [
source = lib
description = "import entire library contents"
]
acceptor.accept(proposal, proposalPriorities.getDefaultPriority(proposal))
}
}
default : {
super._createProposals(rulecall, context, acceptor)
}
}
}
override dispatch createProposals(Keyword keyword, ContentAssistContext context, IIdeContentProposalAcceptor acceptor) {
switch (keyword) {
case stAccess.importAccess.importKeyword_0: {
for (lib : LIBS) {
var proposal = proposalCreator.createProposal('import ' + lib + ".*;", context) [
source = lib
description = "import entire library contents"
]
acceptor.accept(proposal, proposalPriorities.getDefaultPriority(proposal))
}
}
default: {
super._createProposals(keyword, context, acceptor)
}
}
}
}