Layout forest dumping API

[fosterbrereton]

This PR adds eve_t::dump() which outputs the view_proxy_t forest to stderr. The format looks like an eve2 layout description, except the name of the widget is the underlying placeable instance, and the parameters are taken directly from the view_proxy_t's attributes. Example:

some_dialog(left: 0, top: 0, width: 362, height: 138, horizontal: default, vertical: default, placement: row) {
    some_column(left: 20, top: 20, width: 240, height: 98, horizontal: forward, vertical: forward, placement: column) {
        some_subview(left: 20, top: 20, width: 240, height: 43, horizontal: forward_fill, vertical: forward_fill, placement: row) {
            some_subview(left: 0, top: 0, width: 240, height: 43, horizontal: forward_fill, vertical: forward_fill, placement: column) {
                some_row(left: 0, top: 0, width: 240, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: row) {
                    some_row(left: 0, top: 0, width: 183, height: 19, horizontal: forward_fill, vertical: forward_fill, placement: row) {
                        some_statictext(left: 0, top: 3, width: 183, height: 16, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
                    }
                    some_row(left: 195, top: 0, width: 45, height: 24, horizontal: reverse, vertical: reverse, placement: row) {
                        some_unitnumericedit(left: 195, top: 0, width: 45, height: 24, horizontal: reverse, vertical: reverse, placement: leaf);
                    }
                }
                some_slider(left: 0, top: 29, width: 240, height: 14, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
            }
        }
        some_subview(left: 20, top: 75, width: 240, height: 43, horizontal: forward_fill, vertical: forward_fill, placement: row) {
            some_subview(left: 0, top: 0, width: 240, height: 43, horizontal: forward_fill, vertical: forward_fill, placement: column) {
                some_row(left: 0, top: 0, width: 240, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: row) {
                    some_row(left: 0, top: 0, width: 183, height: 19, horizontal: forward_fill, vertical: forward_fill, placement: row) {
                        some_statictext(left: 0, top: 3, width: 183, height: 16, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
                    }
                    some_row(left: 195, top: 0, width: 45, height: 24, horizontal: reverse, vertical: reverse, placement: row) {
                        some_unitnumericedit(left: 195, top: 0, width: 45, height: 24, horizontal: reverse, vertical: reverse, placement: leaf);
                    }
                }
                some_slider(left: 0, top: 29, width: 240, height: 14, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
            }
        }
    }
    some_column(left: 272, top: 20, width: 70, height: 96, horizontal: forward, vertical: forward, placement: column) {
        some_button(left: 272, top: 20, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
        some_overlay(left: 272, top: 56, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: overlay) {
            some_button(left: 272, top: 56, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
            some_button(left: 272, top: 56, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
            some_button(left: 272, top: 56, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
        }
        some_tabview(left: 0, top: 0, width: 0, height: 0, horizontal: forward_fill, vertical: forward_fill, placement: column) {
            some_button(left: 0, top: 0, width: 0, height: 0, horizontal: default, vertical: default, placement: leaf);
        }
        some_column(left: 272, top: 92, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: column) {
            some_row(left: 272, top: 92, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: row) {
                some_checkbox(left: 272, top: 92, width: 70, height: 24, horizontal: forward_fill, vertical: forward_fill, placement: leaf);
            }
        }
    }
}

[sean-parent]

A unit test for these changes is required.

[sean-parent]

Check that the string matches something known.

[fosterbrereton]

I thought about this, too, but the name of the type is implementation dependent, so will change from compiler to compiler. Do you have a suggestion on how that could be mitigated?

[fosterbrereton]

Hopefully this workaround will suffice?

[sean-parent]

LGTM