resolves #527 activate completion when : is at the start of the line

src/extension.ts

@@ -15,8 +15,9 @@ import { AsciidocEngine } from './asciidocEngine'
 import { getAsciidocExtensionContributions } from './asciidocExtensions'
 import { ExtensionContentSecurityPolicyArbiter, PreviewSecuritySelector } from './security'
 import { githubSlugifier } from './slugify'
-import { AttributeCompleter } from './features/attributeCompleter'
 import { AsciidocFileIncludeAutoCompletionMonitor } from './util/includeAutoCompletion'
+import { AttributeReferenceProvider } from './features/attributeReferenceProvider'
+import { BuiltinDocumentAttributeProvider } from './features/builtinDocumentAttributeProvider'
 
 export function activate (context: vscode.ExtensionContext) {
   const contributions = getAsciidocExtensionContributions(context)
@@ -44,7 +45,8 @@ export function activate (context: vscode.ExtensionContext) {
   context.subscriptions.push(vscode.languages.registerDocumentSymbolProvider(selector, symbolProvider))
   context.subscriptions.push(vscode.languages.registerDocumentLinkProvider(selector, new LinkProvider(engine)))
   context.subscriptions.push(vscode.languages.registerWorkspaceSymbolProvider(new AsciidocWorkspaceSymbolProvider(symbolProvider)))
-  context.subscriptions.push(vscode.languages.registerCompletionItemProvider(selector, new AttributeCompleter(contributions.extensionUri), '{'))
+  context.subscriptions.push(vscode.languages.registerCompletionItemProvider(selector, new AttributeReferenceProvider(contributions.extensionUri), '{'))
+  context.subscriptions.push(vscode.languages.registerCompletionItemProvider(selector, new BuiltinDocumentAttributeProvider(contributions.extensionUri), ':'))
   const previewSecuritySelector = new PreviewSecuritySelector(cspArbiter, previewManager)
 
   const commandManager = new CommandManager()

src/features/attributeReferenceProvider.ts

@@ -0,0 +1,31 @@
+import * as vscode from 'vscode'
+
+import { AsciidocParser } from '../asciidocParser'
+
+export class AttributeReferenceProvider {
+  constructor(private readonly extensionUri: vscode.Uri) {
+  }
+
+  async provideCompletionItems(textDocument: vscode.TextDocument, position: vscode.Position) {
+    const {document} = await new AsciidocParser(this.extensionUri).parseText(textDocument.getText(), textDocument)
+    if (document) {
+      const attributes = document.getAttributes()
+      const lineText = textDocument.lineAt(position).text
+      const prefix = lineText.substring(position.character - 1, position.character)
+      const suffix = lineText.substring(position.character, position.character + 1)
+      return Object.keys(attributes).map((key) => {
+          const completionItem = new vscode.CompletionItem({
+              label: key,
+              description: attributes[key]?.toString(),
+            },
+            vscode.CompletionItemKind.Variable)
+          let insertText = key
+          insertText = prefix !== "{" ? `{${insertText}` : insertText
+          insertText = suffix !== "}" ? `${insertText}}` : insertText
+          completionItem.insertText = insertText
+          return completionItem
+        }
+      )
+    }
+  }
+}