xlnt/include/xlnt/cell/cell.hpp

// Copyright (c) 2014-2016 Thomas Fussell
// Copyright (c) 2010-2015 openpyxl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE
//
// @license: http://www.opensource.org/licenses/mit-license.php
// @author: see AUTHORS file
#pragma once

#include <memory>
#include <string>
#include <unordered_map>

#include <xlnt/xlnt_config.hpp> // for XLNT_CLASS, XLNT_FUNCTION
#include <xlnt/cell/cell_type.hpp> // for cell_type
#include <xlnt/cell/index_types.hpp> // for column_t, row_t

namespace xlnt {

enum class calendar;

class alignment;
class base_format;
class border;
class cell_reference;
class comment;
class fill;
class font;
class format;
class number_format;
class protection;
class style;
class workbook;
class worksheet;
class xlsx_consumer;
class xlsx_producer;

struct date;
struct datetime;
struct time;
struct timedelta;

namespace detail { 

class xlsx_consumer;
class xlsx_producer;
struct cell_impl; 

} // namespace detail

/// <summary>
/// Describes cell associated properties.
/// </summary>
/// <remarks>
/// Properties of interest include style, type, value, and address.
/// The Cell class is required to know its value and type, display options,
/// and any other features of an Excel cell.Utilities for referencing
/// cells using Excel's 'A1' column/row nomenclature are also provided.
/// </remarks>
class XLNT_CLASS cell
{
public:
    using type = cell_type;

    /// <summary>
    /// Return a map of error strings such as \#DIV/0! and their associated indices.
    /// </summary>
    static const std::unordered_map<std::string, int> &error_codes();

    // value

    /// <summary>
    /// Return true if value has been set and has not been cleared using cell::clear_value().
    /// </summary>
    bool has_value() const;

    /// <summary>
    /// Return the value of this cell as an instance of type T.
    /// Overloads exist for most C++ fundamental types like bool, int, etc. as well
    /// as for std::string and xlnt datetime types: date, time, datetime, and timedelta.
    /// </summary>
    template <typename T>
    T get_value() const;

    /// <summary>
    /// Make this cell have a value of type null.
    /// All other cell attributes are retained.
    /// </summary>
    void clear_value();

    /// <summary>
    /// Set the value of this cell to the given value.
    /// Overloads exist for most C++ fundamental types like bool, int, etc. as well
    /// as for std::string and xlnt datetime types: date, time, datetime, and timedelta.
	/// </summary>
    template <typename T>
    void set_value(T value);

    /// <summary>
    /// Return the type of this cell.
    /// </summary>
    type get_data_type() const;

    /// <summary>
    /// Set the type of this cell.
    /// </summary>
    void set_data_type(type t);

    // properties

    /// <summary>
    /// There's no reason to keep a cell which has no value and is not a placeholder.
    /// Return true if this cell has no value, style, isn't merged, etc.
    /// </summary>
    bool garbage_collectible() const;

    /// <summary>
    /// Return true iff this cell's number format matches a date format.
    /// </summary>
    bool is_date() const;

    // position

    /// <summary>
    /// Return a cell_reference that points to the location of this cell.
    /// </summary>
    cell_reference get_reference() const;

    /// <summary>
    /// Return the column of this cell.
    /// </summary>
    column_t get_column() const;

    /// <summary>
    /// Return the row of this cell.
    /// </summary>
    row_t get_row() const;

    /// <summary>
    /// Return the location of this cell as an ordered pair.
    /// </summary>
    std::pair<int, int> get_anchor() const;

    // hyperlink

    /// <summary>
    /// Return the URL of this cell's hyperlink.
    /// </summary>
    std::string get_hyperlink() const;

    /// <summary>
    /// Add a hyperlink to this cell pointing to the URI of the given value.
    /// </summary>
    void set_hyperlink(const std::string &value);

    /// <summary>
    /// Return true if this cell has a hyperlink set.
    /// </summary>
    bool has_hyperlink() const;

	// computed format

	/// <summary>
	/// For each of alignment, border, fill, font, number format, and protection,
	/// returns a format using the value from the cell format if that value is
	/// applied, or else the value from the named style if that value is applied,
	/// or else the default value. This is used to retreive the formatting of the cell
	/// as it will be displayed in an editing application.
	/// </summary>
	base_format get_computed_format() const;

	/// <summary>
	/// Returns the result of get_computed_format().get_alignment().
	/// </summary>
	alignment get_computed_alignment() const;

	/// <summary>
	/// Returns the result of get_computed_format().get_border().
	/// </summary>
	border get_computed_border() const;

	/// <summary>
	/// Returns the result of get_computed_format().get_fill().
	/// </summary>
	fill get_computed_fill() const;

	/// <summary>
	/// Returns the result of get_computed_format().get_font().
	/// </summary>
	font get_computed_font() const;

	/// <summary>
	/// Returns the result of get_computed_format().get_number_format().
	/// </summary>
	number_format get_computed_number_format() const;

	/// <summary>
	/// Returns the result of get_computed_format().get_protection().
	/// </summary>
	protection get_computed_protection() const;

    // format

    /// <summary>
    /// Return true if this cell has had a format applied to it.
    /// </summary>
    bool has_format() const;

    /// <summary>
    /// Return a reference to the format applied to this cell.
	/// If this cell has no format, an invalid_attribute exception will be thrown.
    /// </summary>
    format get_format() const;
    
	/// <summary>
	/// Applies the cell-level formatting of new_format to this cell.
	/// </summary>
    void set_format(const format &new_format);
    
	/// <summary>
	/// Remove the cell-level formatting from this cell.
	/// This doesn't affect the style that may also be applied to the cell.
	/// Throws an invalid_attribute exception if no format is applied.
	/// </summary>
    void clear_format();

    /// <summary>
    /// Returns the number format of this cell.
    /// </summary>
    number_format get_number_format() const;
    
	/// <summary>
	/// Creates a new format in the workbook, sets its number_format
	/// to the given format, and applies the format to this cell.
	/// </summary>
    void set_number_format(const number_format &format);

    /// <summary>
    /// Returns the font applied to the text in this cell.
    /// </summary>
    font get_font() const;

	/// <summary>
	/// Creates a new format in the workbook, sets its font
	/// to the given font, and applies the format to this cell.
	/// </summary>
    void set_font(const font &font_);

    /// <summary>
    /// Returns the fill applied to this cell.
    /// </summary>
    fill get_fill() const;

	/// <summary>
	/// Creates a new format in the workbook, sets its fill
	/// to the given fill, and applies the format to this cell.
	/// </summary>
    void set_fill(const fill &fill_);

    /// <summary>
    /// Returns the border of this cell.
    /// </summary>
    border get_border() const;

	/// <summary>
	/// Creates a new format in the workbook, sets its border
	/// to the given border, and applies the format to this cell.
	/// </summary>
    void set_border(const border &border_);

    /// <summary>
    /// Returns the alignment of the text in this cell.
    /// </summary>
    alignment get_alignment() const;

	/// <summary>
	/// Creates a new format in the workbook, sets its alignment
	/// to the given alignment, and applies the format to this cell.
	/// </summary>
    void set_alignment(const alignment &alignment_);

    /// <summary>
    /// Returns the protection of this cell.
    /// </summary>
    protection get_protection() const;

	/// <summary>
	/// Creates a new format in the workbook, sets its protection
	/// to the given protection, and applies the format to this cell.
	/// </summary>
    void set_protection(const protection &protection_);

	// style

	/// <summary>
	/// Returns true if this cell has had a style applied to it.
	/// </summary>
	bool has_style() const;

	/// <summary>
	/// Returns a reference to the named style applied to this cell.
	/// </summary>
	style get_style() const;

	/// <summary>
	/// Equivalent to set_style(new_style.name())
	/// </summary>
	void set_style(const style &new_style);

	/// <summary>
	/// Sets the named style applied to this cell to a style named style_name.
	/// If this style has not been previously created in the workbook, a
	/// key_not_found exception will be thrown.
	/// </summary>
	void set_style(const std::string &style_name);

	/// <summary>
	/// Removes the named style from this cell.
	/// An invalid_attribute exception will be thrown if this cell has no style.
	/// This will not affect the cell format of the cell.
	/// </summary>
	void clear_style();

    // formula

	/// <summary>
	/// Returns the string representation of the formula applied to this cell.
	/// </summary>
    std::string get_formula() const;

	/// <summary>
	/// Sets the formula of this cell to the given value.
	/// This formula string should begin with '='.
	/// </summary>
    void set_formula(const std::string &formula);

	/// <summary>
	/// Removes the formula from this cell. After this is called, has_formula() will return false.
	/// </summary>
    void clear_formula();

	/// <summary>
	/// Returns true if this cell has had a formula applied to it.
	/// </summary>
    bool has_formula() const;

    // printing

    /// <summary>
    /// Returns a string describing this cell like <Cell Sheet.A1>.
    /// </summary>
    std::string to_repr() const;

    /// <summary>
    /// Returns a string representing the value of this cell. If the data type is not a string,
    /// it will be converted according to the number format.
    /// </summary>
    std::string to_string() const;

    // merging

    /// <summary>
    /// Return true iff this cell has been merged with one or more
    /// surrounding cells.
    /// </summary>
    bool is_merged() const;

    /// <summary>
    /// Make this a merged cell iff merged is true.
    /// Generally, this shouldn't be called directly. Instead,
    /// use worksheet::merge_cells on its parent worksheet.
    /// </summary>
    void set_merged(bool merged);

    /// <summary>
    /// Return the error string that is stored in this cell.
    /// </summary>
    std::string get_error() const;

    /// <summary>
    /// Directly assign the value of this cell to be the given error.
    /// </summary>
    void set_error(const std::string &error);

    /// <summary>
    /// Return a cell from this cell's parent workbook at
    /// a relative offset given by the parameters.
    /// </summary>
    cell offset(int column, int row);

    /// <summary>
    /// Return the worksheet that owns this cell.
    /// </summary>
    worksheet get_worksheet();

    /// <summary>
    /// Return the worksheet that owns this cell.
    /// </summary>
    const worksheet get_worksheet() const;

	/// <summary>
	/// Return the workbook of the worksheet that owns this cell.
	/// </summary>
	workbook &get_workbook();

	/// <summary>
	/// Return the workbook of the worksheet that owns this cell.
	/// </summary>
	const workbook &get_workbook() const;

    /// <summary>
    /// Shortcut to return the base date of the parent workbook.
    /// Equivalent to get_workbook().get_properties().excel_base_date
    /// </summary>
    calendar get_base_date() const;

    /// <summary>
    /// Return to_check after checking encoding, size, and illegal characters.
    /// </summary>
    std::string check_string(const std::string &to_check);

    // operators

    /// <summary>
    /// Make this cell point to rhs.
    /// The cell originally pointed to by this cell will be unchanged.
    /// </summary>
    cell &operator=(const cell &rhs);

    /// <summary>
    /// Return true if this cell the same cell as comparand (compare by reference).
    /// </summary>
    bool operator==(const cell &comparand) const;

    /// <summary>
    /// Return true if this cell is uninitialized.
    /// </summary>
    bool operator==(std::nullptr_t) const;

    // friend operators, so we can put cell on either side of comparisons with other types

    /// <summary>
    /// Return true if this cell is uninitialized.
    /// </summary>
    friend XLNT_FUNCTION bool operator==(std::nullptr_t, const cell &cell);

    /// <summary>
    /// Convenience function for writing cell to an ostream.
    /// Uses cell::to_string() internally.
    /// </summary>
    friend XLNT_FUNCTION std::ostream &operator<<(std::ostream &stream, const xlnt::cell &cell);

private:
    // make these friends so they can use the private constructor
    friend class style;
    friend class worksheet;
	friend class detail::xlsx_consumer;
	friend class detail::xlsx_producer;
    friend struct detail::cell_impl;

	/// <summary>
	/// Helper function to guess the type of a string, convert it,
	/// and then use the correct cell::get_value according to the type.
	/// </summary>
	void guess_type_and_set_value(const std::string &value);

	/// <summary>
	/// Returns a non-const reference to the format of this cell.
	/// This is for internal use only.
	/// </summary>
	format &get_format_internal();

    /// <summary>
    /// Private constructor to create a cell from its implementation.
    /// </summary>
    cell(detail::cell_impl *d);

    /// <summary>
    /// A pointer to this cell's implementation.
    /// </summary>
    detail::cell_impl *d_;
};

} // namespace xlnt