#ifndef CPPCMS_FORM_H

#define CPPCMS_FORM_H

#include <cppcms/defs.h>

#include <booster/noncopyable.h>

#include <string>

#include <set>

#include <map>

#include <list>

#include <vector>

#include <stack>

#include <ostream>

#include <sstream>

#include <cppcms/http_context.h>

#include <cppcms/http_request.h>

#include <cppcms/http_response.h>

#include <booster/copy_ptr.h>

#include <booster/perl_regex.h>

#include <booster/shared_ptr.h>

#include <cppcms/cppcms_error.h>

#include <cppcms/util.h>

#include <cppcms/localization.h>

namespace cppcms {

namespace http {

class file;

}

namespace widgets {

class base_widget;

}

///

/// \brief This struct holds various flags to control the HTML generation.

///

struct form_flags {

};

///

/// \brief This class represents the context required to generate the widgets' HTML.

///

class CPPCMS_API form_context : public form_flags

{

public:

///

/// Default constructor.

///

form_context();

///

/// Copy-constructor.

///

form_context(form_context const &other);

///

/// Assignment.

///

form_context const &operator = (form_context const &other);

///

/// Create a rendering context.

///

/// \param output the std::ostream output to write HTML to.

/// \param ht flags represents the type of HTML that should be generated.

/// \param hlt flag defines the style of widgets generation.

///

form_context( std::ostream &output,

html_type ht = form_flags::as_html,

html_list_type hlt=form_flags::as_p);

///

/// Destructor.

///

~form_context();

///

/// Set the HTML/XHTML flag.

///

void html(html_type t);

///

/// Set the widgets rendering style.

///

void html_list(html_list_type t);

///

/// Set the flag for the partial rendering of the widget.

///

void widget_part(widget_part_type t);

///

/// Set the output stream.

///

void out(std::ostream &out);

///

/// Set the HTML/XHTML flag. The default is \a as_html.

///

html_type html() const;

///

/// Get the widget rendering style. The default is \a as_p.

///

html_list_type html_list() const;

///

/// Get the part of the widget that should be generated. See \a widget_part_type. The default is \a first_part.

///

widget_part_type widget_part() const;

///

/// Get the output stream.

///

std::ostream &out() const;

private:

uint32_t html_type_;

uint32_t html_list_type_;

uint32_t widget_part_type_;

std::ostream *output_;

uint32_t reserved_1;

uint32_t reserved_2;

struct _data;

booster::hold_ptr<_data> d;

};

///

/// \brief This class is the base class for any form or form widget used in CppCMS.

///

/// It provides basic, abstract operations that every widget or form should implement.

///

class CPPCMS_API base_form : public form_flags {

public:

///

/// Render the widget to the output set in \a cppcms::form_context::out()

/// according to the control flags set in \a cppcms::form_flags.

/// Usually this function is called directly by the template rendering functions.

///

virtual void render(form_context &context) = 0;

///

/// Load the form information from the provided http::context \a context.

/// A user can call this function to load all information from the raw POST/GET

/// data into the internal widget representation.

///

virtual void load(http::context &context) = 0;

///

/// Validate the form according to defined rules. If all checks are OK,

/// true is returned. If some widget or form fails, false is returned.

///

virtual bool validate() = 0;

///

/// Clear the form from all user provided data.

///

virtual void clear() = 0;

///

/// Set the parent of this form. Used internally. You should not use it.

///

virtual void parent(base_form *subform) = 0;

///

/// Get the parent of this form. If this is the topmost form, NULL is returned.

///

virtual base_form *parent() = 0;

base_form();

virtual ~base_form();

};

///

/// \brief The \a form is a container used to collect other widgets and forms into a single unit.

///

/// Generally various widgets and forms are combined into a single form in order to simplify their rendering

/// and validation of the forms that include more than one widget.

///

class CPPCMS_API form : public booster::noncopyable,

public base_form

{

public:

form();

virtual ~form();

///

/// Render all the widgets and sub-forms to the \a output, using

/// the flags defined in the \a context.

///

virtual void render(form_context &context);

///

/// Load all the widget information from http::context \a cont.

///

virtual void load(http::context &cont);

///

/// Validate all subforms and widgets. If at least one of them fails,

/// false is returned. Otherwise, true is returned.

///

virtual bool validate();

///

/// Clear all subforms and widgets from all loaded data.

///

virtual void clear();

///

/// Add \a subform to form. The ownership is not transferred to

/// the parent.

///

void add(form &subform);

///

/// Add \a subform to form. The ownership is transferred to

/// the parent and the subform will be destroyed together with

/// the parent.

///

void attach(form *subform);

///

/// Add \a widget to form. The ownership is not transferred to

/// to the parent.

///

void add(widgets::base_widget &widget);

///

/// Add \a widget to form. The ownership is transferred to

/// the parent and the widget will be destroyed together with

/// the parent.

///

void attach(widgets::base_widget *widget);

///

/// \deprecated Use add(form &) instead

///

/// Shortcut to \a add.

///

CPPCMS_DEPRECATED inline form &operator + (form &f)

{

add(f);

return *this;

}

///

/// \deprecated Use add(widgets::base_widget &) instead

///

/// Shortcut to \a add.

///

CPPCMS_DEPRECATED inline form &operator + (widgets::base_widget &f)

{

add(f);

return *this;

}

///

/// Set the parent of this form. It is used internally; you should not use it. It is called

/// when the form is added or attached to another form.

///

virtual void parent(base_form *subform);

///

/// Get the parent of this form. If this is the topmost form, NULL is returned.

/// It is assumed that the parent is always a form.

///

virtual form *parent();

///

/// \brief Input iterator used to iterate over all the widgets in a form.

///

/// This class is mainly used by templates to render widgets. It

/// recursively iterates over all the widgets and subforms.

///

/// \note it iterates over widgets only and never \ref

/// form objects.

///

/// \code

/// iterator p=f.begin();

/// if(p!=f.end())

/// if p!=f.end() --> *p is derived from widgets::base_widget.

/// \endcode

///

class CPPCMS_API iterator : public std::iterator<std::input_iterator_tag,widgets::base_widget>

{

public:

///

/// End iterator.

///

iterator();

///

/// Create a widget iterator.

///

iterator(form &);

///

/// Destructor.

///

~iterator();

///

/// Copy the iterator. This operation is not cheap.

///

iterator(iterator const &other);

///

/// Assign the iterator. This operation is not cheap.

///

iterator const &operator = (iterator const &other);

///

/// Return the underlying widget. Condition: *this!=iterator().

///

widgets::base_widget *operator->() const

{

return get();

}

///

/// Return the underlying widget. Condition: *this!=iterator().

///

widgets::base_widget &operator*() const

{

return *get();

}

///

/// Check if two iterators point to the same element.

///

bool operator==(iterator const &other) const

{

return equal(other);

}

///

/// Check if two iterators point to different elements.

///

bool operator!=(iterator const &other) const

{

return !equal(other);

}

///

/// Post increment operator. It forwards the iterator to the next widget.

/// Note it does not point to the higher level form container.

///

/// Note: it is preferable to use ++i rather than i++ as copying iterators is not cheap.

///

iterator operator++(int /*unused*/)

{

iterator tmp(*this);

next();

return tmp;

}

///

/// Increment operator. It forwards the iterator to the next widget.

/// Note it does not point to the higher level form container.

///

iterator &operator++()

{

next();

return *this;

}

private:

friend class form;

bool equal(iterator const &other) const;

void zero();

void next();

widgets::base_widget *get() const;

std::stack<unsigned> return_positions_;

form *current_;

unsigned offset_;

struct _data;

booster::copy_ptr<_data> d;

};

///

/// Returns the iterator to the first widget.

///

iterator begin();

///

/// Returns the end of the range iterator.

///

iterator end();

private:

friend class iterator;

struct _data;

// Widget and ownership - true means I own it.

typedef std::pair<base_form *,bool> widget_type;

std::vector<widget_type> elements_;

form *parent_;

booster::hold_ptr<_data> d;

};

///

/// \brief This namespace includes all the widgets (i.e. parts of HTML forms) supported by cppcms.

///

namespace widgets {

///

/// \brief this class is the base class of all renderable widgets which

/// can be used with CppCMS form system.

///

/// All cppcms widgets are derived from this class. Users who want to create

/// their own custom widgets must derive them from this class.

///

class CPPCMS_API base_widget :

public base_form,

public booster::noncopyable

{

public:

///

/// Default constructor.

///

base_widget();

virtual ~base_widget();

///

/// Check if a value has been assigned to the widget. It is usually true

/// when the user has assigned a value to the widget or when the widget is loaded.

///

/// If there is a reasonable default value for the widget

/// then set() should be true. For widgets like file or numeric

/// where explicit parsing is required, the set() value would indicate

/// that user provided some value (i.e. uploaded a file or entered a number).

///

bool set();

///

/// After having executed the validation process, each widget can be tested for validity.

///

bool valid();

///

/// Get the HTML \a id attribute.

///

std::string id();

///

/// Get the HTML \a name attribute.

///

std::string name();

///

/// Get the short message that would be displayed near the widget.

///

locale::message message();

///

/// Check if a message is set.

///

bool has_message();

///

/// Get the error message that would be displayed near the widget

/// if the widget validation failed.

///

locale::message error_message();

///

/// Check if an error message is set.

///

bool has_error_message();

///

/// Get the eventual long description of the wigget.

///

locale::message help();

///

/// Check if a help message is set.

///

bool has_help();

///

/// Get the HTML \c disabled attribute.

///

bool disabled();

///

/// Set/Unset the HTML \c disabled attribute.

///

void disabled(bool);

///

/// Get the general user defined attribute string that can be added to the widget.

///

std::string attributes_string();

///

/// Set the existence of content for the widget. By default the widget is not set.

/// By convention, trying to fetch a value from a widget that is "unset" will throw an exception.

/// Call set(true) to change the state to "set" and call set(false) to change it to "unset".

///

void set(bool);

///

/// Set th validity state of the widget. By default the widget is valid. If it fails to pass

/// the validation, its validity state is changed by calling this function.

///

/// Note: a widget may be "unset" and still be valid. Conversely, it may be set but be not-valid.

///

void valid(bool);

///

/// Set the HTML \c id attribute of the widget.

///

void id(std::string);

///

/// Set the HTML \c name attribute of the widget. Note: if this attribute

/// is not set, the widget will not be able to be loaded from the POST/GET

/// data.

///

void name(std::string);

///

/// Set a short description for the widget. Generally, it is a good idea to

/// define this value.

///

/// The short message can also be set using the base_widget constructor.

///

void message(std::string);

///

/// Set a short translatable description for the widget. Generally, it is a good idea to

/// define this value.

///

/// The short message can also be set using the base_widget constructor.

///

void message(locale::message const &);

///

/// Set the error message that is displayed for invalid widgets.

///

/// If it is not set, a simple "*" is shown instead.

///

void error_message(std::string);

///

/// Set the translatable error message that is displayed for invalid widgets.

///

/// If it is not set, a simple "*" is shown instead.

///

void error_message(locale::message const &);

///

/// Set a longer help message that describes this widget.

///

void help(std::string);

///

/// Set a translatable help message that describes this widget.

///

void help(locale::message const &msg);

///

/// Set general HTML attributes that are not directly supported

/// For example:

///

/// \code

/// my_widget.attributes_string("style='direction:rtl' onclick='return foo()'");

/// \endcode

///

/// This string is inserted as-is just after render_input_start.

///

void attributes_string(std::string v);

///

/// Render the full widget together with error messages and decorations as paragraphs

/// or table elements to the output set in \a cppcms::form_context::out().

///

virtual void render(form_context &context);

///

/// This is a virtual member function that should be implemented by each widget.

/// It executes the actual rendering of the HTML form.

///

virtual void render_input(form_context &context) = 0;

///

/// Clear the form. It also calls set(false).

///

virtual void clear();

///

/// Validate the form. If not overridden, it sets the widget to \a valid.

///

virtual bool validate();

///

/// Render standard common attributes like \a id, \a name, \a disabled, etc.

///

virtual void render_attributes(form_context &context);

///

/// Set the parent of this widget. It is used internally; you should not use it. It is called

/// when the form is added or attached to another form.

///

virtual void parent(base_form *subform);

///

/// Get the parent of this form. If this is the topmost form, NULL is returned.

/// It is assumed that the parent is always a form.

///

virtual form *parent();

///

/// This function should be called before actual loading

/// of widgets, it performs cross widgets validation

/// and causes automatic generation of undefined names

///

void pre_load(http::context &);

protected:

///

/// This function should be called by overloadeding the load/render methods

/// before the loading/rendering starts.

///

void auto_generate(form_context *context = 0);

private:

void generate(int position,form_context *context = 0);

std::string id_;

std::string name_;

locale::message message_;

locale::message error_message_;

locale::message help_;

std::string attr_;

form *parent_;

uint32_t is_valid_ : 1;

uint32_t is_set_ : 1;

uint32_t is_disabled_ : 1;

uint32_t is_generation_done_ : 1;

uint32_t has_message_ : 1;

uint32_t has_error_ : 1;

uint32_t has_help_ : 1;

uint32_t reserverd_ : 25;

struct _data;

booster::hold_ptr<_data> d;

};

///

/// \brief This widget is used as base for text input fields.

///

/// This widget is used as the base class for other widgets that are used for

/// text input like: \ref text, \ref textarea, etc.

///

/// This widget does much more than reading simple text data from the POST

/// or GET form. It also performs charset validation.

///

class CPPCMS_API base_text : virtual public base_widget {

public:

base_text();

virtual ~base_text();

///

/// Get the string that contains the input value of the widget.

///

std::string value();

///

/// Set the widget content to the value \a v before rendering.

///

void value(std::string v);

///

/// Inform the validator that this text widget should contain some text.

/// It is similar to limits(1,-1).

///

void non_empty();

///

/// Set the minimum and maximum limits of the text size. Note: max == -1 indicates that there

/// is no maximum limit; min==0 indicates that there is no minimum limit.

///

/// Note: these numbers represent the length in Unicode code points (even if the encoding

/// is not Unicode). If the character set validation is disabled, then these numbers represent

/// the number of octets in the string.

///

void limits(int min,int max);

///

/// Get the minimum and maximum size limits,

///

std::pair<int,int> limits();

///

/// Inform the validator whether it should check the validity of the charset.

/// The default is enabled (true).

///

/// Generally you should not use this option to disable the charset validation

/// unless you want to load some raw data as

/// form input, or the character set is different from the one defined in the locale.

///

void validate_charset(bool );

///

/// Return true if the charset validation is enabled.

///

bool validate_charset();

///

/// Validate the widget content according to the rules and to the charset encoding.

///

/// Notes:

///

/// - The charset validation is very efficient for variable length UTF-8 encoding as well as

/// for most popular fixed length encodings like ISO-8859-*, windows-125* and koi8*.

/// For other encodings, character set conversion is used for the actual validation.

/// - Special characters (that are not allowed in HTML) are assumed to be forbidden, even if they are

/// valid code points (like NUL = 0 or DEL=127).

///

virtual bool validate();

///

/// Load the widget for http::context. It uses the locale given in the context to

/// validate the text.

///

virtual void load(http::context &);

private:

std::string value_;

int low_;

int high_;

bool validate_charset_;

size_t code_points_;

struct _data;

booster::hold_ptr<_data> d;

};

///

/// \brief This class represents a basic widget that generates HTML form elements

/// the widgets that use the <input \/> HTML tag.

///

/// It allows you to create your own widgets more easily. It does most of job required to

/// generate the HTML. The user is only required to generate the actual value like

/// value="10.34" as with a numeric widget.

///

class CPPCMS_API base_html_input : virtual public base_widget {

public:

///

/// Create a new instance. \a type is the HTML type tag of the input element, for example "text" or

/// "password".

///

base_html_input(std::string const &type);

///

/// Virtual destructor.

///

virtual ~base_html_input();

///

/// This function generates the actual HTML. It calls render_value where needed.

///

virtual void render_input(form_context &context);

protected:

///

/// Write the actual value of the HTML tag. Derived classes must implement this.

///

virtual void render_value(form_context &context) = 0;

private:

struct _data;

booster::hold_ptr<_data> d;

std::string type_;

};

///

/// \brief This class represents an HTML form input element of type text.

///

class CPPCMS_API text : public base_html_input, public base_text

{

public:

///

/// Create a text field widget.

///

text();

///

/// This constructor is provided for use by derived classes where it is required

/// to change the type of the widget, like text, password, etc.

///

text(std::string const &type);

~text();

///

/// Set the HTML size attribute of the widget.

///

void size(int n);

///

/// Get the HTML size attribute size of the widget. It returns -1 if it is undefined.

///

int size();

virtual void render_attributes(form_context &context);

virtual void render_value(form_context &context);

private:

int size_;

struct _data;

booster::hold_ptr<_data> d;

};

///

/// \brief This widget represents a hidden input form element. It is used to provide

/// information invisible to the user.

///

/// I has the same properties as a text widget has but it does not render any HTML

/// for message(), help() and other informational types.

///

/// When you render the form in templates, it is a good idea to render it separately

/// to make sure that no invalid HTML is created.

///

class CPPCMS_API hidden : public text

{

public:

hidden();

~hidden();

///

/// Render the HTML of the widget. It overrides

/// the default HTML rendering as hidden widget

/// is never displayed.

///

virtual void render(form_context &context);

private:

struct _data;

booster::hold_ptr<_data> d;

};

///

/// \brief This text widget behaves similarly to the text widget but uses

/// the \c textarea HTML tag rather than the \c input HTML tag.

///

class CPPCMS_API textarea : public base_text

{

public:

textarea();

~textarea();

///

/// Get the number of rows in the textarea. The default is -1 -- undefined.

///

int rows();

///

/// Get the number of columns in the textarea. The default is -1 -- undefined.

///

int cols();

///

/// Set the number of rows in the textarea.

///

void rows(int n);

///

/// Set the number of columns in the textarea.

///

void cols(int n);

virtual void render_input(form_context &context);

private:

int rows_,cols_;

struct _data;

booster::hold_ptr<_data> d;

};

///

/// \brief Widget for number input. It is a template class that assumes that T is a number.

///

/// This class parses the input and checks if it is input text is a valid

/// numeric value. If it is valid, the set() would return true

/// be true.

///

/// If the value was not defined, access to value() will throw an exception.

///

template<typename T>

class numeric: public base_html_input {