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CodeWriter.cpp
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391 lines (322 loc) · 9.65 KB
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//
// CodeWriter.cpp
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "CodeWriter.h"
#include "Page.h"
#include "Poco/Path.h"
#include "Poco/StringTokenizer.h"
#include "Poco/String.h"
using Poco::Path;
using Poco::StringTokenizer;
CodeWriter::CodeWriter(const Page& page, const std::string& clazz):
_page(page),
_class(clazz)
{
}
CodeWriter::~CodeWriter()
{
}
void CodeWriter::writeHeader(std::ostream& ostr, const std::string& headerFileName)
{
beginGuard(ostr, headerFileName);
writeHeaderIncludes(ostr);
ostr << "\n\n";
std::string decls(_page.headerDecls().str());
if (!decls.empty())
{
ostr << decls << "\n\n";
}
beginNamespace(ostr);
writeHandlerClass(ostr);
writeFactoryClass(ostr);
endNamespace(ostr);
endGuard(ostr, headerFileName);
}
void CodeWriter::writeImpl(std::ostream& ostr, const std::string& headerFileName)
{
ostr << "#include \"" << headerFileName << "\"\n";
writeImplIncludes(ostr);
if (_page.getBool("page.compressed", false))
{
ostr << "#include \"Poco/DeflatingStream.h\"\n";
}
if (_page.getBool("page.buffered", false))
{
ostr << "#include \"Poco/StreamCopier.h\"\n";
ostr << "#include <sstream>\n";
}
ostr << "\n\n";
std::string decls(_page.implDecls().str());
if (!decls.empty())
{
ostr << decls << "\n\n";
}
beginNamespace(ostr);
std::string path = _page.get("page.path", "");
if (!path.empty())
{
ostr << "\tconst std::string " << _class << "::PATH(\"" << path << "\");\n\n\n";
}
writeConstructor(ostr);
writeHandler(ostr);
writeFactory(ostr);
endNamespace(ostr);
writeManifest(ostr);
}
void CodeWriter::beginNamespace(std::ostream& ostr)
{
std::string ns = _page.get("page.namespace", "");
if (!ns.empty())
{
StringTokenizer tok(ns, ":", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
for (StringTokenizer::Iterator it = tok.begin(); it != tok.end(); ++it)
{
ostr << "namespace " << *it << " {\n";
}
ostr << "\n\n";
}
}
void CodeWriter::endNamespace(std::ostream& ostr)
{
std::string ns = _page.get("page.namespace", "");
if (!ns.empty())
{
ostr << "\n\n";
StringTokenizer tok(ns, ":", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
for (StringTokenizer::Iterator it = tok.begin(); it != tok.end(); ++it)
{
ostr << "} ";
}
ostr << "// namespace " << ns << "\n";
}
}
void CodeWriter::beginGuard(std::ostream& ostr, const std::string& headerFileName)
{
Path p(headerFileName);
std::string guard(p.getBaseName());
Poco::translateInPlace(guard, ".-", "__");
guard += "_INCLUDED";
ostr << "#ifndef " << guard << "\n";
ostr << "#define " << guard << "\n";
ostr << "\n\n";
}
void CodeWriter::endGuard(std::ostream& ostr, const std::string& headerFileName)
{
Path p(headerFileName);
std::string guard(p.getBaseName());
Poco::translateInPlace(guard, ".-", "__");
guard += "_INCLUDED";
ostr << "\n\n";
ostr << "#endif // " << guard << "\n";
}
void CodeWriter::handlerClass(std::ostream& ostr, const std::string& base, const std::string& ctorArg)
{
std::string exprt(_page.get("page.export", ""));
if (!exprt.empty()) exprt += ' ';
ostr << "class " << exprt << _class << ": public " << base << "\n";
ostr << "{\n";
ostr << "public:\n";
if (!ctorArg.empty())
{
ostr << "\t" << _class << "(" << ctorArg << ");\n";
ostr << "\n";
}
ostr << "\tvoid handleRequest(Poco::Net::HTTPServerRequest& request, Poco::Net::HTTPServerResponse& response);\n";
writeHandlerMembers(ostr);
std::string path = _page.get("page.path", "");
if (!path.empty())
{
ostr << "\n\tstatic const std::string PATH;\n";
}
ostr << "};\n";
}
void CodeWriter::factoryClass(std::ostream& ostr, const std::string& base)
{
ostr << "class " << _class << "Factory: public " << base << "\n";
ostr << "{\n";
ostr << "public:\n";
ostr << "\tPoco::Net::HTTPRequestHandler* createRequestHandler(const Poco::Net::HTTPServerRequest& request);\n";
ostr << "};\n";
}
void CodeWriter::factoryImpl(std::ostream& ostr, const std::string& arg)
{
ostr << "Poco::Net::HTTPRequestHandler* " << _class << "Factory::createRequestHandler(const Poco::Net::HTTPServerRequest& request)\n";
ostr << "{\n";
ostr << "\treturn new " << _class << "(" << arg << ");\n";
ostr << "}\n";
}
void CodeWriter::writeHeaderIncludes(std::ostream& ostr)
{
ostr << "#include \"Poco/Net/HTTPRequestHandler.h\"\n";
}
void CodeWriter::writeHandlerClass(std::ostream& ostr)
{
std::string base(_page.get("page.baseClass", "Poco::Net::HTTPRequestHandler"));
std::string ctorArg;
ctorArg = _page.get("page.context", _page.get("page.ctorArg", ""));
handlerClass(ostr, base, ctorArg);
}
void CodeWriter::writeHandlerMembers(std::ostream& ostr)
{
std::string context(_page.get("page.context", ""));
if (!context.empty())
{
ostr << "\n";
ostr << "protected:\n";
ostr << "\t" << context << " context() const\n";
ostr << "\t{\n";
ostr << "\t\treturn _context;\n";
ostr << "\t}\n";
ostr << "\n";
ostr << "private:\n";
ostr << "\t" << context << " _context;\n";
}
}
void CodeWriter::writeFactoryClass(std::ostream& ostr)
{
}
void CodeWriter::writeImplIncludes(std::ostream& ostr)
{
ostr << "#include \"Poco/Net/HTTPServerRequest.h\"\n";
ostr << "#include \"Poco/Net/HTTPServerResponse.h\"\n";
ostr << "#include \"Poco/Net/HTMLForm.h\"\n";
}
void CodeWriter::writeConstructor(std::ostream& ostr)
{
std::string base(_page.get("page.baseClass", "Poco::Net::HTTPRequestHandler"));
std::string context(_page.get("page.context", ""));
std::string ctorArg(_page.get("page.ctorArg", ""));
if (!context.empty())
{
ostr << _class << "::" << _class << "(" << context << " context):\n";
ostr << "\t_context(context)\n";
ostr << "{\n}\n";
ostr << "\n\n";
}
else if (!ctorArg.empty())
{
ostr << _class << "::" << _class << "(" << ctorArg << " arg):\n";
ostr << "\t" << base << "(arg)\n";
ostr << "{\n}\n";
ostr << "\n\n";
}
}
void CodeWriter::writeHandler(std::ostream& ostr)
{
ostr << "void " << _class << "::handleRequest(Poco::Net::HTTPServerRequest& request, Poco::Net::HTTPServerResponse& response)\n";
ostr << "{\n";
writeResponse(ostr);
writeSession(ostr);
if (_page.has("page.precondition"))
{
ostr << "\tif (!(" << _page.get("page.precondition") << ")) return;\n\n";
}
writeForm(ostr);
ostr << _page.preHandler().str();
writeContent(ostr);
ostr << "}\n";
}
void CodeWriter::writeFactory(std::ostream& ostr)
{
}
void CodeWriter::writeManifest(std::ostream& ostr)
{
}
void CodeWriter::writeSession(std::ostream& ostr)
{
}
void CodeWriter::writeForm(std::ostream& ostr)
{
if (_page.getBool("page.form", true))
{
std::string partHandler(_page.get("page.formPartHandler", ""));
if (!partHandler.empty())
{
ostr << "\t" << partHandler << " cpspPartHandler(*this);\n";
}
ostr << "\tPoco::Net::HTMLForm form(request, request.stream()";
if (!partHandler.empty())
{
ostr << ", cpspPartHandler";
}
ostr << ");\n";
}
}
void CodeWriter::writeResponse(std::ostream& ostr)
{
std::string contentType(_page.get("page.contentType", "text/html"));
std::string contentLang(_page.get("page.contentLanguage", ""));
bool buffered(_page.getBool("page.buffered", false));
bool chunked(_page.getBool("page.chunked", !buffered));
bool compressed(_page.getBool("page.compressed", false));
if (buffered) compressed = false;
if (compressed) chunked = true;
if (chunked)
{
ostr << "\tresponse.setChunkedTransferEncoding(true);\n";
}
ostr << "\tresponse.setContentType(\"" << contentType << "\");\n";
if (!contentLang.empty())
{
ostr << "\tif (request.has(\"Accept-Language\"))\n"
<< "\t\tresponse.set(\"Content-Language\", \"" << contentLang << "\");\n";
}
if (compressed)
{
ostr << "\tbool _compressResponse(request.hasToken(\"Accept-Encoding\", \"gzip\"));\n"
<< "\tif (_compressResponse) response.set(\"Content-Encoding\", \"gzip\");\n";
}
ostr << "\n";
}
void CodeWriter::writeContent(std::ostream& ostr)
{
bool buffered(_page.getBool("page.buffered", false));
bool chunked(_page.getBool("page.chunked", !buffered));
bool compressed(_page.getBool("page.compressed", false));
int compressionLevel(_page.getInt("page.compressionLevel", 1));
if (buffered) compressed = false;
if (compressed) chunked = true;
if (buffered)
{
ostr << "\tstd::stringstream responseStream;\n";
ostr << cleanupHandler(_page.handler().str());
if (!chunked)
{
ostr << "\tresponse.setContentLength(static_cast<int>(responseStream.tellp()));\n";
}
ostr << "\tPoco::StreamCopier::copyStream(responseStream, response.send());\n";
}
else if (compressed)
{
ostr << "\tstd::ostream& _responseStream = response.send();\n"
<< "\tPoco::DeflatingOutputStream _gzipStream(_responseStream, Poco::DeflatingStreamBuf::STREAM_GZIP, " << compressionLevel << ");\n"
<< "\tstd::ostream& responseStream = _compressResponse ? _gzipStream : _responseStream;\n";
ostr << cleanupHandler(_page.handler().str());
ostr << "\tif (_compressResponse) _gzipStream.close();\n";
}
else
{
ostr << "\tstd::ostream& responseStream = response.send();\n";
ostr << cleanupHandler(_page.handler().str());
}
}
std::string CodeWriter::cleanupHandler(std::string handler)
{
static const std::string EMPTY_WRITE("\tresponseStream << \"\";\n");
static const std::string NEWLINE_WRITE("\tresponseStream << \"\\n\";\n");
static const std::string DOUBLE_NEWLINE_WRITE("\tresponseStream << \"\\n\";\n\tresponseStream << \"\\n\";\n");
static const std::string EMPTY;
// remove empty writes
Poco::replaceInPlace(handler, EMPTY_WRITE, EMPTY);
// remove consecutive newlines
while (handler.find(DOUBLE_NEWLINE_WRITE) != std::string::npos)
{
Poco::replaceInPlace(handler, DOUBLE_NEWLINE_WRITE, NEWLINE_WRITE);
}
return handler;
}