svtools: HtmlWriter - for writing HTML structure to a stream

HtmlWriter is used to write the structure of a HTML document to
a stream. The goal is to abstract the messy construction of
strings when writing attributes of a html element and other
HTML specifics needed when structuring a HTML document.

Change-Id: Ibdf42914e43ef02f16a43e4230575ed7340e68d8

include/svtools/HtmlWriter.hxx

@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_HTML_HXX
+#define INCLUDED_HTML_HXX
+
+#include <rtl/string.hxx>
+#include <tools/stream.hxx>
+#include <vector>
+#include <svtools/svtdllapi.h>
+
+class SVT_DLLPUBLIC HtmlWriter
+{
+private:
+    std::vector<OString>  mElementStack;
+    SvStream&             mStream;
+
+    bool                  mElementOpen;
+    bool                  mContentWritten;
+
+public:
+    HtmlWriter(SvStream& rStream);
+    virtual ~HtmlWriter();
+
+    void start(OString aElement);
+    void end();
+    void write(OString aContent);
+    void attribute(OString aAttribute, OString aValue);
+    void endAttribute();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

svtools/Library_svt.mk

@@ -197,6 +197,7 @@ $(eval $(call gb_Library_add_exception_objects,svt,\
     svtools/source/svhtml/htmlkywd \
     svtools/source/svhtml/htmlout \
     svtools/source/svhtml/htmlsupp \
+    svtools/source/svhtml/HtmlWriter \
     svtools/source/svhtml/parhtml \
     svtools/source/svrtf/parrtf \
     svtools/source/svrtf/rtfkeywd \

svtools/source/svhtml/HtmlWriter.cxx

@@ -0,0 +1,101 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#include <svtools/HtmlWriter.hxx>
+
+HtmlWriter::HtmlWriter(SvStream& rStream) :
+    mStream(rStream),
+    mElementOpen(false),
+    mContentWritten(false)
+{}
+
+HtmlWriter::~HtmlWriter()
+{}
+
+void HtmlWriter::start(OString aElement)
+{
+    if (mElementOpen)
+    {
+        mStream.WriteChar('>');
+        if (!mContentWritten)
+            mStream.WriteChar('\n');
+        mContentWritten = false;
+    }
+    mElementStack.push_back(aElement);
+
+    for(size_t i = 0; i < mElementStack.size() - 1; i++)
+        mStream.WriteCharPtr("  ");
+
+    mStream.WriteChar('<');
+    mStream.WriteOString(aElement);
+    mElementOpen = true;
+}
+
+void HtmlWriter::endAttribute()
+{
+    if (mElementOpen)
+    {
+        mStream.WriteCharPtr(" />");
+        mStream.WriteCharPtr("\n");
+        mElementOpen = false;
+    }
+}
+
+void HtmlWriter::end()
+{
+    if (mElementOpen)
+    {
+        mStream.WriteCharPtr(" />");
+        mStream.WriteCharPtr("\n");
+    }
+    else
+    {
+        if (!mContentWritten)
+        {
+            for(size_t i = 0; i < mElementStack.size() - 1; i++)
+            {
+                mStream.WriteCharPtr("  ");
+            }
+        }
+        mStream.WriteCharPtr("</");
+        mStream.WriteOString(mElementStack.back());
+        mStream.WriteCharPtr(">\n");
+    }
+    mElementStack.pop_back();
+    mElementOpen = false;
+    mContentWritten = false;
+}
+
+void HtmlWriter::write(OString aContent)
+{
+    if (mElementOpen)
+    {
+        mStream.WriteChar('>');
+        mElementOpen = false;
+    }
+    mContentWritten = true;
+    mStream.WriteOString(aContent);
+}
+
+void HtmlWriter::attribute(OString aAttribute, OString aValue)
+{
+    if (mElementOpen && !aAttribute.isEmpty() && !aValue.isEmpty())
+    {
+        mStream.WriteChar(' ');
+        mStream.WriteOString(aAttribute);
+        mStream.WriteChar('=');
+        mStream.WriteChar('"');
+        mStream.WriteOString(aValue);
+        mStream.WriteChar('"');
+    }
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */