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Template.cpp
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//
// Template.cpp
//
// $Id$
//
// Library: JSON
// Package: JSON
// Module: Template
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/JSON/Template.h"
#include "Poco/JSON/TemplateCache.h"
#include "Poco/JSON/Query.h"
#include "Poco/File.h"
#include "Poco/FileStream.h"
using Poco::Dynamic::Var;
namespace Poco {
namespace JSON {
POCO_IMPLEMENT_EXCEPTION(JSONTemplateException, Exception, "Template Exception")
class Part
{
public:
Part()
{
}
virtual ~Part()
{
}
virtual void render(const Var& data, std::ostream& out) const = 0;
typedef std::vector<SharedPtr<Part> > VectorParts;
};
class StringPart: public Part
{
public:
StringPart() : Part()
{
}
StringPart(const std::string& content) : Part(), _content(content)
{
}
virtual ~StringPart()
{
}
void render(const Var& data, std::ostream& out) const
{
out << _content;
}
void setContent(const std::string& content)
{
_content = content;
}
inline std::string getContent() const
{
return _content;
}
private:
std::string _content;
};
class MultiPart: public Part
{
public:
MultiPart()
{
}
virtual ~MultiPart()
{
}
virtual void addPart(Part* part)
{
_parts.push_back(part);
}
void render(const Var& data, std::ostream& out) const
{
for(VectorParts::const_iterator it = _parts.begin(); it != _parts.end(); ++it)
{
(*it)->render(data, out);
}
}
protected:
VectorParts _parts;
};
class EchoPart: public Part
{
public:
EchoPart(const std::string& query) : Part(), _query(query)
{
}
virtual ~EchoPart()
{
}
void render(const Var& data, std::ostream& out) const
{
Query query(data);
Var value = query.find(_query);
if ( ! value.isEmpty() )
{
out << value.convert<std::string>();
}
}
private:
std::string _query;
};
class LogicQuery
{
public:
LogicQuery(const std::string& query) : _queryString(query)
{
}
virtual ~LogicQuery()
{
}
virtual bool apply(const Var& data) const
{
bool logic = false;
Query query(data);
Var value = query.find(_queryString);
if ( ! value.isEmpty() ) // When empty, logic will be false
{
if ( value.isString() )
// An empty string must result in false, otherwise true
// Which is not the case when we convert to bool with Var
{
std::string s = value.convert<std::string>();
logic = ! s.empty();
}
else
{
// All other values, try to convert to bool
// An empty object or array will turn into false
// all other values depend on the convert<> in Var
logic = value.convert<bool>();
}
}
return logic;
}
protected:
std::string _queryString;
};
class LogicExistQuery : public LogicQuery
{
public:
LogicExistQuery(const std::string& query) : LogicQuery(query)
{
}
virtual ~LogicExistQuery()
{
}
virtual bool apply(const Var& data) const
{
Query query(data);
Var value = query.find(_queryString);
return !value.isEmpty();
}
};
class LogicElseQuery : public LogicQuery
{
public:
LogicElseQuery() : LogicQuery("")
{
}
virtual ~LogicElseQuery()
{
}
virtual bool apply(const Var& data) const
{
return true;
}
};
class LogicPart : public MultiPart
{
public:
LogicPart() : MultiPart()
{
}
virtual ~LogicPart()
{
}
void addPart(LogicQuery* query, Part* part)
{
MultiPart::addPart(part);
_queries.push_back(query);
}
void addPart(Part* part)
{
MultiPart::addPart(part);
_queries.push_back(new LogicElseQuery());
}
void render(const Var& data, std::ostream& out) const
{
int count = 0;
for(std::vector<SharedPtr<LogicQuery> >::const_iterator it = _queries.begin(); it != _queries.end(); ++it, ++count)
{
if( (*it)->apply(data) && _parts.size() > count )
{
_parts[count]->render(data, out);
break;
}
}
}
private:
std::vector<SharedPtr<LogicQuery> > _queries;
};
class LoopPart: public MultiPart
{
public:
LoopPart(const std::string& name, const std::string& query) : MultiPart(), _name(name), _query(query)
{
}
virtual ~LoopPart()
{
}
void render(const Var& data, std::ostream& out) const
{
Query query(data);
if ( data.type() == typeid(Object::Ptr) )
{
Object::Ptr dataObject = data.extract<Object::Ptr>();
Array::Ptr array = query.findArray(_query);
if ( ! array.isNull() )
{
for(int i = 0; i < array->size(); i++)
{
Var value = array->get(i);
dataObject->set(_name, value);
MultiPart::render(data, out);
}
dataObject->remove(_name);
}
}
}
private:
std::string _name;
std::string _query;
};
class IncludePart: public Part
{
public:
IncludePart(const Path& parentPath, const Path& path)
: Part()
, _path(path)
{
// When the path is relative, try to make it absolute based
// on the path of the parent template. When the file doesn't
// exist, we keep it relative and hope that the cache can
// resolve it.
if ( _path.isRelative() )
{
Path templatePath(parentPath, _path);
File templateFile(templatePath);
if ( templateFile.exists() )
{
_path = templatePath;
}
}
}
virtual ~IncludePart()
{
}
void render(const Var& data, std::ostream& out) const
{
TemplateCache* cache = TemplateCache::instance();
if ( cache == NULL )
{
Template tpl(_path);
tpl.parse();
tpl.render(data, out);
}
else
{
Template::Ptr tpl = cache->getTemplate(_path);
tpl->render(data, out);
}
}
private:
Path _path;
};
Template::Template(const Path& templatePath)
: _parts(NULL)
, _templatePath(templatePath)
{
}
Template::Template()
: _parts(NULL)
{
}
Template::~Template()
{
if ( _parts != NULL )
{
delete _parts;
}
}
void Template::parse()
{
File file(_templatePath);
if ( file.exists() )
{
FileInputStream fis(_templatePath.toString());
parse(fis);
}
}
void Template::parse(std::istream& in)
{
_parseTime.update();
_parts = new MultiPart();
_currentPart = _parts;
while(in.good())
{
std::string text = readText(in); // Try to read text first
if ( text.length() > 0 )
{
_currentPart->addPart(new StringPart(text));
}
if ( in.bad() )
break; // Nothing to do anymore
std::string command = readTemplateCommand(in); // Try to read a template command
if ( command.empty() )
{
break;
}
readWhiteSpace(in);
if ( command.compare("echo") == 0 )
{
std::string query = readQuery(in);
if ( query.empty() )
{
throw JSONTemplateException("Missing query in <? echo ?>");
}
_currentPart->addPart(new EchoPart(query));
}
else if ( command.compare("for") == 0 )
{
std::string loopVariable = readWord(in);
if ( loopVariable.empty() )
{
throw JSONTemplateException("Missing variable in <? for ?> command");
}
readWhiteSpace(in);
std::string query = readQuery(in);
if ( query.empty() )
{
throw JSONTemplateException("Missing query in <? for ?> command");
}
_partStack.push(_currentPart);
LoopPart* part = new LoopPart(loopVariable, query);
_partStack.push(part);
_currentPart->addPart(part);
_currentPart = part;
}
else if ( command.compare("else") == 0 )
{
if ( _partStack.size() == 0 )
{
throw JSONTemplateException("Unexpected <? else ?> found");
}
_currentPart = _partStack.top();
LogicPart* lp = dynamic_cast<LogicPart*>(_currentPart);
if ( lp == NULL )
{
throw JSONTemplateException("Missing <? if ?> or <? ifexist ?> for <? else ?>");
}
MultiPart* part = new MultiPart();
lp->addPart(part);
_currentPart = part;
}
else if ( command.compare("elsif") == 0
|| command.compare("elif") == 0 )
{
std::string query = readQuery(in);
if ( query.empty() )
{
throw JSONTemplateException("Missing query in <? " + command + " ?>");
}
if ( _partStack.size() == 0 )
{
throw JSONTemplateException("Unexpected <? elsif / elif ?> found");
}
_currentPart = _partStack.top();
LogicPart* lp = dynamic_cast<LogicPart*>(_currentPart);
if ( lp == NULL )
{
throw JSONTemplateException("Missing <? if ?> or <? ifexist ?> for <? elsif / elif ?>");
}
MultiPart* part = new MultiPart();
lp->addPart(new LogicQuery(query), part);
_currentPart = part;
}
else if ( command.compare("endfor") == 0 )
{
if ( _partStack.size() < 2 )
{
throw JSONTemplateException("Unexpected <? endfor ?> found");
}
MultiPart* loopPart = _partStack.top();
LoopPart* lp = dynamic_cast<LoopPart*>(loopPart);
if ( lp == NULL )
{
throw JSONTemplateException("Missing <? for ?> command");
}
_partStack.pop();
_currentPart = _partStack.top();
_partStack.pop();
}
else if ( command.compare("endif") == 0 )
{
if ( _partStack.size() < 2 )
{
throw JSONTemplateException("Unexpected <? endif ?> found");
}
_currentPart = _partStack.top();
LogicPart* lp = dynamic_cast<LogicPart*>(_currentPart);
if ( lp == NULL )
{
throw JSONTemplateException("Missing <? if ?> or <? ifexist ?> for <? endif ?>");
}
_partStack.pop();
_currentPart = _partStack.top();
_partStack.pop();
}
else if ( command.compare("if") == 0
|| command.compare("ifexist") == 0 )
{
std::string query = readQuery(in);
if ( query.empty() )
{
throw JSONTemplateException("Missing query in <? " + command + " ?>");
}
_partStack.push(_currentPart);
LogicPart* lp = new LogicPart();
_partStack.push(lp);
_currentPart->addPart(lp);
_currentPart = new MultiPart();
if ( command.compare("ifexist") == 0 )
{
lp->addPart(new LogicExistQuery(query), _currentPart);
}
else
{
lp->addPart(new LogicQuery(query), _currentPart);
}
}
else if ( command.compare("include") == 0 )
{
readWhiteSpace(in);
std::string filename = readString(in);
if ( filename.empty() )
{
throw JSONTemplateException("Missing filename in <? include ?>");
}
else
{
Path resolvePath(_templatePath);
resolvePath.makeParent();
_currentPart->addPart(new IncludePart(resolvePath, filename));
}
}
else
{
throw JSONTemplateException("Unknown command " + command);
}
readWhiteSpace(in);
int c = in.get();
if ( c == '?' && in.peek() == '>' )
{
in.get(); // forget '>'
if ( command.compare("echo") != 0 )
{
if ( in.peek() == '\r' )
{
in.get();
}
if ( in.peek() == '\n' )
{
in.get();
}
}
}
else
{
throw JSONTemplateException("Missing ?>");
}
}
}
std::string Template::readText(std::istream& in)
{
std::string text;
int c = in.get();
while(c != -1)
{
if ( c == '<' )
{
if ( in.peek() == '?' )
{
in.get(); // forget '?'
break;
}
}
text += c;
c = in.get();
}
return text;
}
std::string Template::readTemplateCommand(std::istream& in)
{
std::string command;
readWhiteSpace(in);
int c = in.get();
while(c != -1)
{
if ( Ascii::isSpace(c) )
break;
if ( c == '?' && in.peek() == '>' )
{
in.putback(c);
break;
}
if ( c == '=' && command.length() == 0 )
{
command = "echo";
break;
}
command += c;
c = in.get();
}
return command;
}
std::string Template::readWord(std::istream& in)
{
std::string word;
int c;
while((c = in.peek()) != -1 && ! Ascii::isSpace(c))
{
in.get();
word += c;
}
return word;
}
std::string Template::readQuery(std::istream& in)
{
std::string word;
int c;
while((c = in.get()) != -1)
{
if ( c == '?' && in.peek() == '>' )
{
in.putback(c);
break;
}
if ( Ascii::isSpace(c) )
{
break;
}
word += c;
}
return word;
}
void Template::readWhiteSpace(std::istream& in)
{
int c;
while((c = in.peek()) != -1 && Ascii::isSpace(c))
{
in.get();
}
}
std::string Template::readString(std::istream& in)
{
std::string str;
int c = in.get();
if ( c == '"' )
{
while((c = in.get()) != -1 && c != '"')
{
str += c;
}
}
return str;
}
void Template::render(const Var& data, std::ostream& out) const
{
_parts->render(data, out);
}
} } // Namespace Poco::JSON