thin-provisioning-tools/base/grid_layout.cc

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#include "base/grid_layout.h"
#include <stdexcept>
using namespace base;
using namespace std;
//----------------------------------------------------------------
grid_layout::grid_layout()
: nr_fields_(0)
{
new_row();
}
void
grid_layout::render(ostream &out) const
{
vector<unsigned> widths;
calc_field_widths(widths);
grid::const_iterator row;
bool newline_needed = false;
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for (row = grid_.begin(); row != grid_.end(); ++row) {
row::const_iterator col;
unsigned i;
if (newline_needed) {
out << "\n";
newline_needed = false;
}
for (col = row->begin(), i = 0; col != row->end(); ++col, ++i) {
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out << justify(widths[i], *col) << " ";
newline_needed = true;
}
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}
}
void
grid_layout::new_row()
{
grid_.push_back(row());
}
grid_layout::row const &
grid_layout::current_row() const
{
return grid_.back();
}
grid_layout::row &
grid_layout::current_row()
{
return grid_.back();
}
void
grid_layout::push_field(string const &s)
{
current_row().push_back(s);
nr_fields_ = max<unsigned>(nr_fields_, current_row().size());
}
void
grid_layout::calc_field_widths(vector<unsigned> &widths) const
{
widths.resize(nr_fields_, 0);
grid::const_iterator row;
for (row = grid_.begin(); row != grid_.end(); ++row) {
row::const_iterator col;
unsigned i;
for (col = row->begin(), i = 0; col != row->end(); ++col, ++i)
widths[i] = max<unsigned>(widths[i], col->length());
}
}
string
grid_layout::justify(unsigned width, string const &txt) const
{
if (txt.length() > width)
throw runtime_error("string field too long, internal error");
string result(width - txt.length(), ' ');
result += txt;
return result;
}
//----------------------------------------------------------------