Issue #118: First part of splitting

Pdf4QtLibCore/sources/pdfjavascriptscanner.h

@@ -0,0 +1,96 @@
+//    Copyright (C) 2020-2021 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFJAVASCRIPTSCANNER_H
+#define PDFJAVASCRIPTSCANNER_H
+
+#include "pdfdocument.h"
+
+namespace pdf
+{
+
+struct PDFJavaScriptEntry
+{
+    enum class Type
+    {
+        Invalid,
+        Document,
+        Named,
+        Form,
+        Page,
+        Annotation
+    };
+
+    explicit PDFJavaScriptEntry() = default;
+    explicit PDFJavaScriptEntry(Type type, PDFInteger pageIndex, QString javaScript) :
+        type(type), pageIndex(pageIndex), javaScript(javaScript)
+    {
+
+    }
+
+    bool operator <(const PDFJavaScriptEntry& other) const
+    {
+        return std::tie(type, pageIndex, javaScript) < std::tie(other.type, other.pageIndex, other.javaScript);
+    }
+
+    bool operator==(const PDFJavaScriptEntry&) const = default;
+
+    Type type = Type::Invalid;
+    PDFInteger pageIndex = -1;
+    QString javaScript;
+};
+
+/// Scans document for all javascript presence (in actions). Several option
+/// can be set, for example, scan only document actions, or stop scanning,
+/// when first javascript is found.
+class PDF4QTLIBSHARED_EXPORT PDFJavaScriptScanner
+{
+public:
+    explicit PDFJavaScriptScanner(const PDFDocument* document);
+
+    enum Option
+    {
+        AllPages        = 0x0001,   ///< Scan all pages
+        FindFirstOnly   = 0x0002,   ///< Return only first javascript found
+        ScanDocument    = 0x0004,   ///< Scan document related actions for javascript
+        ScanNamed       = 0x0008,   ///< Scan named javascript in catalog
+        ScanForm        = 0x0010,   ///< Scan javascript in form actions
+        ScanPage        = 0x0020,   ///< Scan javascript in page annotations
+        Optimize        = 0x0040,   ///< Remove redundant entries
+
+        ScanMask = ScanDocument | ScanNamed | ScanForm | ScanPage
+    };
+    Q_DECLARE_FLAGS(Options, Option)
+
+    using Entries = std::vector<PDFJavaScriptEntry>;
+
+    /// Scans document for javascript actions using flags
+    Entries scan(const std::vector<PDFInteger>& pages, Options options)  const;
+
+    /// Returns true, if document has any java script action. Calling
+    /// this function can be slow.
+    bool hasJavaScript() const;
+
+private:
+    const PDFDocument* m_document;
+};
+
+}   // namespace pdf
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(pdf::PDFJavaScriptScanner::Options)
+
+#endif // PDFJAVASCRIPTSCANNER_H