xlnt/source/cell/cell_reference.cpp

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#include <locale>
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#include <xlnt/cell/cell_reference.hpp>
#include <xlnt/common/exceptions.hpp>
#include <xlnt/worksheet/range_reference.hpp>
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#include "detail/constants.hpp"
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namespace xlnt {
std::size_t cell_reference_hash::operator()(const cell_reference &k) const
{
return k.get_row() * constants::MaxColumn + k.get_column_index();
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}
cell_reference cell_reference::make_absolute(const cell_reference &relative_reference)
{
cell_reference copy = relative_reference;
copy.absolute_ = true;
return copy;
}
cell_reference::cell_reference() : cell_reference(1, 1, false)
{
}
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cell_reference::cell_reference(const std::string &string)
{
bool absolute = false;
auto split = split_reference(string, absolute, absolute);
*this = cell_reference(split.first, split.second, absolute);
}
cell_reference::cell_reference(const char *reference_string) : cell_reference(std::string(reference_string))
{
}
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cell_reference::cell_reference(const std::string &column, row_t row, bool absolute)
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: column_(column_index_from_string(column)),
row_(row),
absolute_(absolute)
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{
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if(row == 0 || row_ >= constants::MaxRow || column_ == 0 || column_ >= constants::MaxColumn)
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{
throw cell_coordinates_exception(column_, row_);
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}
}
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cell_reference::cell_reference(column_t column_index, row_t row, bool absolute)
: column_(column_index),
row_(row),
absolute_(absolute)
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{
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if(row_ == 0 || row_ >= constants::MaxRow || column_ == 0 || column_ >= constants::MaxColumn)
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{
throw cell_coordinates_exception(column_, row_);
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}
}
range_reference cell_reference::operator,(const xlnt::cell_reference &other) const
{
return range_reference(*this, other);
}
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std::string cell_reference::to_string() const
{
if(absolute_)
{
return std::string("$") + column_string_from_index(column_) + "$" + std::to_string(row_);
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}
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return column_string_from_index(column_) + std::to_string(row_);
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}
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range_reference cell_reference::to_range() const
{
return range_reference(column_, row_, column_, row_);
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}
std::pair<std::string, row_t> cell_reference::split_reference(const std::string &reference_string, bool &absolute_column, bool &absolute_row)
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{
absolute_column = false;
absolute_row = false;
// Convert a coordinate string like 'B12' to a tuple ('B', 12)
bool column_part = true;
std::string column_string;
for(auto character : reference_string)
{
char upper = std::toupper(character, std::locale::classic());
if(std::isalpha(character, std::locale::classic()))
{
if(column_part)
{
column_string.append(1, upper);
}
else
{
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throw cell_coordinates_exception(reference_string);
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}
}
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else if(character == '$')
{
if(column_part)
{
if(column_string.empty())
{
column_string.append(1, upper);
}
else
{
column_part = false;
}
}
}
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else
{
if(column_part)
{
column_part = false;
}
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else if(!std::isdigit(character, std::locale::classic()))
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{
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throw cell_coordinates_exception(reference_string);
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}
}
}
std::string row_string = reference_string.substr(column_string.length());
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if(row_string.length() == 0)
{
throw cell_coordinates_exception(reference_string);
}
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if(column_string[0] == '$')
{
absolute_row = true;
column_string = column_string.substr(1);
}
if(row_string[0] == '$')
{
absolute_column = true;
row_string = row_string.substr(1);
}
return {column_string, std::stoi(row_string)};
}
cell_reference cell_reference::make_offset(int column_offset, int row_offset) const
{
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return cell_reference(static_cast<column_t>(static_cast<int>(column_) + column_offset),
static_cast<row_t>(static_cast<int>(row_) + row_offset));
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}
bool cell_reference::operator==(const cell_reference &comparand) const
{
return comparand.column_ == column_
&& comparand.row_ == row_
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&& absolute_ == comparand.absolute_;
}
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column_t cell_reference::column_index_from_string(const std::string &column_string)
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{
if(column_string.length() > 3 || column_string.empty())
{
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throw column_string_index_exception();
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}
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column_t column_index = 0;
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int place = 1;
for(int i = static_cast<int>(column_string.length()) - 1; i >= 0; i--)
{
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if(!std::isalpha(column_string[static_cast<std::size_t>(i)], std::locale::classic()))
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{
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throw column_string_index_exception();
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}
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column_index += static_cast<column_t>((std::toupper(column_string[static_cast<std::size_t>(i)], std::locale::classic()) - 'A' + 1) * place);
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place *= 26;
}
return column_index;
}
// Convert a column number into a column letter (3 -> 'C')
// Right shift the column col_idx by 26 to find column letters in reverse
// order.These numbers are 1 - based, and can be converted to ASCII
// ordinals by adding 64.
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std::string cell_reference::column_string_from_index(column_t column_index)
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{
// these indicies corrospond to A->ZZZ and include all allowed
// columns
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if(column_index < 1 || column_index > constants::MaxColumn)
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{
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// auto msg = "Column index out of bounds: " + std::to_string(column_index);
throw column_string_index_exception();
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}
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int temp = static_cast<int>(column_index);
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std::string column_letter = "";
while(temp > 0)
{
int quotient = temp / 26, remainder = temp % 26;
// check for exact division and borrow if needed
if(remainder == 0)
{
quotient -= 1;
remainder = 26;
}
column_letter = std::string(1, char(remainder + 64)) + column_letter;
temp = quotient;
}
return column_letter;
}
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bool cell_reference::operator<(const cell_reference &other)
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{
if(row_ != other.row_)
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{
return row_ < other.row_;
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}
return column_ < other.column_;
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}
bool cell_reference::operator>(const cell_reference &other)
{
if(row_ != other.row_)
{
return row_ > other.row_;
}
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return column_ > other.column_;
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}
bool cell_reference::operator<=(const cell_reference &other)
{
if(row_ != other.row_)
{
return row_ < other.row_;
}
return column_ <= other.column_;
}
bool cell_reference::operator>=(const cell_reference &other)
{
if(row_ != other.row_)
{
return row_ > other.row_;
}
return column_ >= other.column_;
}
} // namespace xlnt