New code assist API

This is a re-work of our completion engine. Primary goals are:

- Allow the computation to run in a separate thread so the GUI is not locked.
- Support a model-based approach. QStrings are still needed (filtering, etc), but
internal structures are free to use more efficient representations.
- Unifiy all kinds of *assist* into a more reusable and extensible framework.
- Remove unnecessary dependencies on the text editor so we have more generic
and easily "plugable" components (still things to be resolved).

src/plugins/texteditor/snippets/snippetassistcollector.cpp

@@ -30,18 +30,18 @@
 **
 **************************************************************************/
 
-#include "snippetcollector.h"
+#include "snippetassistcollector.h"
 #include "snippetscollection.h"
 
 #include <texteditor/texteditorconstants.h>
+#include <texteditor/codeassist/basicproposalitem.h>
 
 using namespace TextEditor;
 using namespace Internal;
 
 namespace {
 
-void appendSnippets(ICompletionCollector *collector,
-                    QList<CompletionItem> *completionItems,
+void appendSnippets(QList<BasicProposalItem *> *items,
                     const QString &groupId,
                     const QIcon &icon,
                     int order)
@@ -50,30 +50,32 @@ void appendSnippets(ICompletionCollector *collector,
     const int size = collection->totalActiveSnippets(groupId);
     for (int i = 0; i < size; ++i) {
         const Snippet &snippet = collection->snippet(i, groupId);
-        CompletionItem item(collector);
-        item.text = snippet.trigger() + QLatin1Char(' ') + snippet.complement();
-        item.data = snippet.content();
-        item.details = snippet.generateTip();
-        item.icon = icon;
-        item.order = order;
-        item.isSnippet = true;
-        completionItems->append(item);
+        BasicProposalItem *item = new BasicProposalItem;
+        item->setText(snippet.trigger() + QLatin1Char(' ') + snippet.complement());
+        item->setData(snippet.content());
+        item->setDetail(snippet.generateTip());
+        item->setIcon(icon);
+        item->setOrder(order);
+        items->append(item);
     }
 }
 
 } // anonymous
 
-SnippetCollector::SnippetCollector(const QString &groupId, const QIcon &icon, int order) :
-    m_groupId(groupId), m_icon(icon), m_order(order)
+
+SnippetAssistCollector::SnippetAssistCollector(const QString &groupId, const QIcon &icon, int order)
+    : m_groupId(groupId)
+    , m_icon(icon)
+    , m_order(order)
 {}
 
-SnippetCollector::~SnippetCollector()
+SnippetAssistCollector::~SnippetAssistCollector()
 {}
 
-QList<CompletionItem> SnippetCollector::getSnippets(ICompletionCollector *collector) const
+QList<BasicProposalItem *> SnippetAssistCollector::collect() const
 {
-    QList<CompletionItem> completionItems;
-    appendSnippets(collector, &completionItems, m_groupId, m_icon, m_order);
-    appendSnippets(collector, &completionItems, Constants::TEXT_SNIPPET_GROUP_ID, m_icon, m_order);
-    return completionItems;
+    QList<BasicProposalItem *> snippets;
+    appendSnippets(&snippets, m_groupId, m_icon, m_order);
+    appendSnippets(&snippets, Constants::TEXT_SNIPPET_GROUP_ID, m_icon, m_order);
+    return snippets;
 }

src/plugins/texteditor/snippets/snippetassistcollector.h

@@ -30,11 +30,10 @@
 **
 **************************************************************************/
 
-#ifndef SNIPPETPROVIDER_H
-#define SNIPPETPROVIDER_H
+#ifndef SNIPPETASSISTCOLLECTOR_H
+#define SNIPPETASSISTCOLLECTOR_H
 
 #include <texteditor/texteditor_global.h>
-#include <texteditor/icompletioncollector.h>
 
 #include <QtCore/QString>
 #include <QtCore/QList>
@@ -42,13 +41,15 @@
 
 namespace TextEditor {
 
-class TEXTEDITOR_EXPORT SnippetCollector
+class BasicProposalItem;
+
+class TEXTEDITOR_EXPORT SnippetAssistCollector
 {
 public:
-    SnippetCollector(const QString &groupId, const QIcon &icon, int order = 0);
-    ~SnippetCollector();
+    SnippetAssistCollector(const QString &groupId, const QIcon &icon, int order = 0);
+    ~SnippetAssistCollector();
 
-    QList<CompletionItem> getSnippets(ICompletionCollector *collector) const;
+    QList<BasicProposalItem *> collect() const;
 
 private:
     QString m_groupId;
@@ -58,4 +59,4 @@ private:
 
 } // TextEditor
 
-#endif // SNIPPETPROVIDER_H
+#endif // SNIPPETASSISTCOLLECTOR_H