mirror of
https://github.com/VCMP-SqMod/SqMod.git
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4a6bfc086c
Switched to POCO library for unified platform/library interface. Deprecated the external module API. It was creating more problems than solving. Removed most built-in libraries in favor of system libraries for easier maintenance. Cleaned and secured code with help from static analyzers.
152 lines
3.7 KiB
C++
152 lines
3.7 KiB
C++
//
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// Template.h
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//
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// Library: JSON
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// Package: JSON
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// Module: Template
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//
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// Definition of the Template class.
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//
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// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef JSON_JSONTemplate_INCLUDED
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#define JSON_JSONTemplate_INCLUDED
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#include "Poco/JSON/JSON.h"
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#include "Poco/Dynamic/Var.h"
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#include "Poco/SharedPtr.h"
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#include "Poco/Path.h"
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#include "Poco/Timestamp.h"
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#include <sstream>
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#include <stack>
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namespace Poco {
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namespace JSON {
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class MultiPart;
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POCO_DECLARE_EXCEPTION(JSON_API, JSONTemplateException, Poco::Exception)
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class JSON_API Template
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/// Template is a template engine which uses JSON as input
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/// for generating output. There are commands for
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/// looping over JSON arrays, include other templates,
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/// conditional output, etc.
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///
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/// All text is send to the outputstream. A command is placed
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/// between
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/// <?
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/// and
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/// ?>
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/// ----
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///
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/// These are the available commands:
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///
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/// <? echo query ?>
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/// ----
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/// The result of the query is send to the output stream
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/// This command can also be written as <?= query ?>
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///
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/// <? if query ?> <? else ?> <? endif ?>
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/// ----
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/// When the result of query is true, all the text between
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/// if and else (or endif when there is no else) is send to the
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/// output stream. When the result of query is false, all the text
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/// between else and endif is send to the output stream. An empty
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/// object, an empty array or a null value is considered as a false value.
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/// For numbers a zero is false. An empty String is also false.
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///
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/// <? ifexist query ?> <? else ?> <? endif ?>
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/// ----
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/// This can be used to check the existence of the value.
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/// Use this for example when a zero value is ok (which returns false for <? if ?>.
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///
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/// <? for variable query ?> <? endfor ?>
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/// ----
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/// The result of the query must be an array. For each element
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/// in the array the text between for and endfor is send to the
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/// output stream. The active element is stored in the variable.
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///
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/// <? include "filename" ?>
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/// ----
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/// Includes a template. When the filename is relative it will try
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/// to resolve the filename against the active template. When this
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/// file doesn't exist, it can still be found when the JSONTemplateCache
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/// is used.
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///
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/// A query is passed to Poco::JSON::Query to get the value.
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{
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public:
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using Ptr = SharedPtr<Template>;
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Template();
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/// Creates a Template.
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Template(const Path& templatePath);
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/// Creates a Template from the file with the given templatePath.
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virtual ~Template();
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/// Destroys the Template.
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void parse();
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/// Parse a template from a file.
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void parse(const std::string& source);
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/// Parse a template from a string.
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void parse(std::istream& in);
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/// Parse a template from an input stream.
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Timestamp parseTime() const;
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/// Returns the time when the template was parsed.
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void render(const Dynamic::Var& data, std::ostream& out) const;
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/// Renders the template and send the output to the stream.
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private:
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std::string readText(std::istream& in);
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std::string readWord(std::istream& in);
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std::string readQuery(std::istream& in);
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std::string readTemplateCommand(std::istream& in);
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std::string readString(std::istream& in);
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void readWhiteSpace(std::istream& in);
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MultiPart* _parts;
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std::stack<MultiPart*> _partStack;
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MultiPart* _currentPart;
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Path _templatePath;
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Timestamp _parseTime;
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};
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//
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// inlines
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//
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inline void Template::parse(const std::string& source)
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{
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std::istringstream is(source);
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parse(is);
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}
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inline Timestamp Template::parseTime() const
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{
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return _parseTime;
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}
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} } // namespace Poco::JSON
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#endif // JSON_JSONTemplate_INCLUDED
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