/usr/include/zeep/http/webapp/el.hpp is in libzeep-dev 3.0.2-5ubuntu1.
This file is owned by root:root, with mode 0o644.
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// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// expression language support
//
#pragma once
#include <map>
#include <boost/range.hpp>
#include <boost/cstdint.hpp>
#include <zeep/http/request.hpp>
#include <zeep/exception.hpp>
#ifndef LIBZEEP_DOXYGEN_INVOKED
typedef boost::int8_t int8;
typedef boost::uint8_t uint8;
typedef boost::int16_t int16;
typedef boost::uint16_t uint16;
typedef boost::int32_t int32;
typedef boost::uint32_t uint32;
typedef boost::int64_t int64;
typedef boost::uint64_t uint64;
#endif
namespace zeep {
namespace http {
namespace el
{
namespace detail
{
class object_impl;
class object_iterator_impl;
};
class scope;
/// This zeep::http::el::object class is a bridge to the `el` expression language.
class object
{
public:
/// object can have one of these basic types:
enum object_type
{
null_type,
array_type,
struct_type,
number_type,
string_type
};
object();
object(const object& o);
explicit object(detail::object_impl* impl);
~object();
/// create an array object
explicit object(const std::vector<object>& v);
explicit object(const std::vector<std::string>& v);
/// construct an object directly from some basic types
explicit object(bool v);
explicit object(int8 v);
explicit object(uint8 v);
explicit object(int16 v);
explicit object(uint16 v);
explicit object(int32 v);
explicit object(uint32 v);
explicit object(int64 v);
explicit object(uint64 v);
explicit object(float v);
explicit object(double v);
explicit object(const char* v);
explicit object(const std::string& v);
object& operator=(const object& o);
/// assign an array object
object& operator=(const std::vector<object>& v);
object& operator=(const std::vector<std::string>& v);
/// and assign some basic types
object& operator=(bool v);
object& operator=(int8 v);
object& operator=(uint8 v);
object& operator=(int16 v);
object& operator=(uint16 v);
object& operator=(int32 v);
object& operator=(uint32 v);
object& operator=(int64 v);
object& operator=(uint64 v);
object& operator=(float v);
object& operator=(double v);
object& operator=(const char* v);
object& operator=(const std::string& v);
object_type type() const;
template<typename T>
T as() const;
const object operator[](const std::string& name) const;
const object operator[](const char* name) const;
const object operator[](const object& index) const;
object& operator[](const std::string& name);
object& operator[](const char* name);
object& operator[](const object& index);
size_t count() const;
bool empty() const;
bool operator<(const object& rhs) const;
bool operator==(const object& rhs) const;
template<class ObjectType>
class basic_iterator : public std::iterator<std::forward_iterator_tag, ObjectType>
{
public:
typedef typename std::iterator<std::forward_iterator_tag, ObjectType> base_type;
typedef typename base_type::reference reference;
typedef typename base_type::pointer pointer;
basic_iterator();
basic_iterator(const basic_iterator& other);
basic_iterator(detail::object_impl* a);
basic_iterator(detail::object_impl* a, int);
basic_iterator(const detail::object_impl* a);
basic_iterator(const detail::object_impl* a, int);
~basic_iterator();
basic_iterator& operator=(const basic_iterator& other);
reference operator*() const;
pointer operator->() const;
basic_iterator& operator++();
basic_iterator operator++(int);
bool operator==(const basic_iterator& other) const;
bool operator!=(const basic_iterator& other) const;
private:
detail::object_iterator_impl*
m_impl;
};
typedef basic_iterator<object> iterator;
typedef basic_iterator<const object> const_iterator;
iterator begin() { return iterator(m_impl); }
iterator end() { return iterator(m_impl, -1); }
const_iterator begin() const { return const_iterator(m_impl); }
const_iterator end() const { return const_iterator(m_impl, -1); }
friend iterator range_begin(object& x) { return x.begin(); }
friend iterator range_end(object& x) { return x.end(); }
friend const_iterator range_begin(const object& x) { return x.begin(); }
friend const_iterator range_end(const object& x) { return x.end(); }
friend std::ostream& operator<<(std::ostream& lhs, const object& rhs);
std::string toJSON() const;
private:
friend object operator+(const object& a, const object& b);
friend object operator-(const object& a, const object& b);
friend object operator*(const object& a, const object& b);
friend object operator%(const object& a, const object& b);
friend object operator/(const object& a, const object& b);
friend object operator-(const object& a);
class detail::object_impl* m_impl;
};
/// \brief Process the text in \a text and return `true` if the result is
/// not empty, zero or false.
///
/// The expression in \a text is processed and if the result of this
/// expression is empty, false or zero then `false` is returned.
/// \param scope The scope for this el script
/// \param text The el script
/// \return The result of the script
bool process_el(const scope& scope, std::string& text);
/// \brief Process the text in \a text. The result is put in \a result
///
/// The expression in \a text is processed and the result is returned
/// in \a result.
/// \param scope The scope for this el script
/// \param text The el script
/// \return The result of the script
void evaluate_el(const scope& scope, const std::string& text, object& result);
/// \brief Process the text in \a text and replace it with the result
///
/// The expressions found in \a text are processed and the output of
/// the processing is used as a replacement value for the expressions.
/// \param scope The scope for the el scripts
/// \param text The text optionally containing el scripts.
/// \return Returns true if \a text was changed.
bool evaluate_el(const scope& scope, const std::string& text);
// --------------------------------------------------------------------
class scope
{
public:
scope(const request& req);
explicit scope(const scope& next);
template<typename T>
void put(const std::string& name, const T& value);
template<typename ForwardIterator>
void put(const std::string& name, ForwardIterator begin, ForwardIterator end);
const object& lookup(const std::string& name) const;
const object& operator[](const std::string& name) const;
object& lookup(const std::string& name);
object& operator[](const std::string& name);
const request& get_request() const;
private:
friend std::ostream& operator<<(std::ostream& lhs, const scope& rhs);
scope& operator=(const scope&);
typedef std::map<std::string,object> data_map;
data_map m_data;
scope* m_next;
const request* m_req;
};
/// for debugging purposes
std::ostream& operator<<(std::ostream& lhs, const scope& rhs);
template<typename T>
inline
void scope::put(
const std::string& name,
const T& value)
{
m_data[name] = object(value);
}
template<>
inline
void scope::put(
const std::string& name,
const object& value)
{
m_data[name] = value;
}
template<typename ForwardIterator>
inline
void scope::put(
const std::string& name,
ForwardIterator begin,
ForwardIterator end)
{
std::vector<object> elements;
while (begin != end)
elements.push_back(object(*begin++));
m_data[name] = object(elements);
}
// --------------------------------------------------------------------
namespace detail
{
class object_iterator_impl;
class object_impl
{
public:
void reference() { ++m_refcount; }
void release() { if (--m_refcount == 0) delete this; }
object::object_type type() const { return m_type; }
bool is_null() const { return m_type == object::null_type; }
bool is_array() const { return m_type == object::array_type; }
bool is_struct() const { return m_type == object::struct_type; }
bool is_number() const { return m_type == object::number_type; }
bool is_string() const { return m_type == object::string_type; }
virtual void print(std::ostream& os) const = 0;
virtual int compare(object_impl* rhs) const = 0;
virtual int64 to_int() const;
virtual double to_double() const;
virtual std::string to_str() const;
virtual std::string to_JSON() const;
friend class object;
protected:
object_impl(object::object_type type = object::null_type)
: m_refcount(1)
, m_type(type)
{
}
virtual ~object_impl()
{
}
private:
object_impl(const object_impl&);
object_impl& operator=(const object_impl&);
int32 m_refcount;
object::object_type m_type;
};
class base_array_object_impl : public object_impl
{
public:
virtual size_t count() const = 0;
virtual object_iterator_impl*
create_iterator(bool begin) const = 0;
virtual object& at(uint32 ix);
virtual const object at(uint32 ix) const;
protected:
base_array_object_impl()
: object_impl(object::array_type)
{
}
};
class base_struct_object_impl : public object_impl
{
public:
virtual object& field(const std::string& name) = 0;
virtual const object field(const std::string& name) const = 0;
protected:
base_struct_object_impl()
: object_impl(object::struct_type)
{
}
};
class object_iterator_impl
{
public:
void reference() { ++m_refcount; }
void release() { if (--m_refcount == 0) delete this; }
object_iterator_impl()
: m_refcount(1) {}
virtual void increment() = 0;
virtual object& dereference() = 0;
virtual bool equal(const object_iterator_impl* other) = 0;
protected:
virtual ~object_iterator_impl() {}
private:
int m_refcount;
};
}
// --------------------------------------------------------------------
template<class ObjectType>
object::basic_iterator<ObjectType>::basic_iterator()
: m_impl(nullptr)
{
}
template<class ObjectType>
object::basic_iterator<ObjectType>::basic_iterator(const basic_iterator& o)
: m_impl(o.m_impl)
{
if (m_impl != nullptr)
m_impl->reference();
}
template<class ObjectType>
object::basic_iterator<ObjectType>::basic_iterator(detail::object_impl* a)
: m_impl(nullptr)
{
detail::base_array_object_impl* impl = dynamic_cast<detail::base_array_object_impl*>(a);
if (impl != nullptr)
m_impl = impl->create_iterator(true);
}
template<class ObjectType>
object::basic_iterator<ObjectType>::basic_iterator(detail::object_impl* a, int)
: m_impl(nullptr)
{
detail::base_array_object_impl* impl = dynamic_cast<detail::base_array_object_impl*>(a);
if (impl != nullptr)
m_impl = impl->create_iterator(false);
}
template<class ObjectType>
object::basic_iterator<ObjectType>::basic_iterator(const detail::object_impl* a)
: m_impl(nullptr)
{
const detail::base_array_object_impl* impl = dynamic_cast<const detail::base_array_object_impl*>(a);
if (impl != nullptr)
m_impl = impl->create_iterator(true);
}
template<class ObjectType>
object::basic_iterator<ObjectType>::basic_iterator(const detail::object_impl* a, int)
: m_impl(nullptr)
{
const detail::base_array_object_impl* impl = dynamic_cast<const detail::base_array_object_impl*>(a);
if (impl != nullptr)
m_impl = impl->create_iterator(false);
}
template<class ObjectType>
object::basic_iterator<ObjectType>::~basic_iterator()
{
if (m_impl != nullptr)
m_impl->release();
}
template<class ObjectType>
object::basic_iterator<ObjectType>& object::basic_iterator<ObjectType>::operator=(const basic_iterator& o)
{
if (this != &o)
{
if (m_impl != nullptr)
m_impl->release();
m_impl = o.m_impl;
if (m_impl != nullptr)
m_impl->reference();
}
return *this;
}
template<class ObjectType>
typename object::basic_iterator<ObjectType>::reference object::basic_iterator<ObjectType>::operator*() const
{
if (m_impl == nullptr)
throw exception("dereferencing invalid object iterator");
return m_impl->dereference();
}
template<class ObjectType>
typename object::basic_iterator<ObjectType>::pointer object::basic_iterator<ObjectType>::operator->() const
{
if (m_impl == nullptr)
throw exception("dereferencing invalid object iterator");
return &m_impl->dereference();
}
template<class ObjectType>
object::basic_iterator<ObjectType>& object::basic_iterator<ObjectType>::operator++()
{
if (m_impl == nullptr)
throw exception("incrementing invalid object iterator");
m_impl->increment();
return *this;
}
template<class ObjectType>
object::basic_iterator<ObjectType> object::basic_iterator<ObjectType>::operator++(int)
{
if (m_impl == nullptr)
throw exception("incrementing invalid object iterator");
basic_iterator<ObjectType> iter(*this);
m_impl->increment();
return iter;
}
template<class ObjectType>
bool object::basic_iterator<ObjectType>::operator==(const basic_iterator& o) const
{
bool result;
if (m_impl == nullptr and o.m_impl == nullptr)
result = true;
else if (m_impl == nullptr or o.m_impl == nullptr)
throw exception("invalid object iterators");
else
result = m_impl->equal(o.m_impl);
return result;
}
template<class ObjectType>
bool object::basic_iterator<ObjectType>::operator!=(const basic_iterator& o) const
{
bool result;
if (m_impl == nullptr and o.m_impl == nullptr)
result = false;
else if (m_impl == nullptr or o.m_impl == nullptr)
throw exception("invalid object iterators");
else
result = not m_impl->equal(o.m_impl);
return result;
}
}
}
}
#ifndef LIBZEEP_DOXYGEN_INVOKED
// enable foreach (.., array object)
namespace boost
{
// specialize range_mutable_iterator and range_const_iterator in namespace boost
template<>
struct range_mutable_iterator<zeep::http::el::object>
{
typedef zeep::http::el::object::iterator type;
};
template<>
struct range_const_iterator<zeep::http::el::object>
{
typedef zeep::http::el::object::const_iterator type;
};
}
#endif
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