import gdb;
import re;

class VectorWrapperPrinter:
    def __init__(self, parVal):
        self.val = parVal

    def to_string(self):
        sz = int(self.val["m_wrapped"].type.template_argument(1));
        arr_vals = ", ".join(str(self.val["m_wrapped"]["_M_elems"][z]) for z in range(0, sz));
        return "<{0}>".format(arr_vals);

def vector_wrapper_match(parVal):
    tag_value = str(parVal.type.strip_typedefs().tag);
    if tag_value == None:
        return None;

    reg_vecbase = re.compile("^vwr::implem::VecBase<.*>$");
    reg_vec = re.compile("^vwr::Vec<.*>$");
    if reg_vecbase.match(tag_value) or reg_vec.match(tag_value):
        return VectorWrapperPrinter(parVal);
    else:
        return None;

def display_hint(self):
    return "array";

def register_printers(parObjfile):
    parObjfile.pretty_printers.append(vector_wrapper_match);

# (gdb) p parFrom
# $1 = (const dk::Viewport<2u>::coords &) @0x7fffffffb810: {<vwr::implem::VecBase<std::array<int, 2ul> >> = {m_wrapped = {_M_elems = {0, 
#         0}}}, <vwr::implem::VecAccessors<std::array<int, 2ul>, 2u>> = {<vwr::implem::Vec2Promotion<std::array<int, 2ul>, true>> = {<No data fields>}, <No data fields>}, static unit_x = <optimized out>, static unit_y = <optimized out>}

# (gdb) p parFrom
# $1 = (const dk::Viewport<2u>::coords &) @0x7fffffffb810: {<vwr::implem::VecBase<std::array<int, 2ul> >> = 
#   {0, 0}, <vwr::implem::VecAccessors<std::array<int, 2ul>, 2u>> = {<vwr::implem::Vec2Promotion<std::array<int, 2ul>, true>> = {<No data fields>}, <No data fields>}, static unit_x = <optimized out>, static unit_y = <optimized out>}