1 files changed, 62 insertions, 0 deletions
diff --git a/src/qmlls/qqmlcompletioncontextstrings_p.h b/src/qmlls/qqmlcompletioncontextstrings_p.h
new file mode 100644
index 0000000000..78cf2b1553
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+++ b/src/qmlls/qqmlcompletioncontextstrings_p.h
@@ -0,0 +1,62 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQMLLSCOMPLETIONCONTEXTSTRINGS_H
+#define QQMLLSCOMPLETIONCONTEXTSTRINGS_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qtconfigmacros.h>
+#include <QtCore/qstring.h>
+#include <QtCore/qstringview.h>
+
+QT_BEGIN_NAMESPACE
+
+// finds the filter string, the base (for fully qualified accesses) and the whole string
+// just before pos in code
+struct CompletionContextStrings
+{
+    CompletionContextStrings(QString code, qsizetype pos);
+
+public:
+    // line up until pos
+    QStringView preLine() const
+    {
+        return QStringView(m_code).mid(m_lineStart, m_pos - m_lineStart);
+    }
+    // the part used to filter the completion (normally actual filtering is left to the client)
+    QStringView filterChars() const
+    {
+        return QStringView(m_code).mid(m_filterStart, m_pos - m_filterStart);
+    }
+    // the base part (qualified access)
+    QStringView base() const
+    {
+        return QStringView(m_code).mid(m_baseStart, m_filterStart - m_baseStart);
+    }
+    // if we are at line start
+    bool atLineStart() const { return m_atLineStart; }
+
+    qsizetype offset() const { return m_pos; }
+
+private:
+    QString m_code; // the current code
+    qsizetype m_pos = {}; // current position of the cursor
+    qsizetype m_filterStart = {}; // start of the characters that are used to filter the suggestions
+    qsizetype m_lineStart = {}; // start of the current line
+    qsizetype m_baseStart = {}; // start of the dotted expression that ends at the cursor position
+    bool m_atLineStart = {}; // if there are only spaces before base
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLLSCOMPLETIONCONTEXTSTRINGS_H