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from ctypes import (c_char_p, c_int32, c_int, c_bool, sizeof, c_void_p, byref)
import libghdl.thin.name_table as name_table
import libghdl.thin.vhdl.nodes as nodes
import libghdl.thin.vhdl.nodes_meta as nodes_meta
import libghdl.thin.vhdl.lists as lists
import libghdl.thin.vhdl.flists as flists
from libghdl.thin.vhdl.nodes_meta import (Attr, types)

def name_image(nameid):
    return name_table.Get_Name_Ptr(nameid).decode('utf-8')

def _build_enum_image(cls):
    d = [e for e in dir(cls) if e[0] != '_']
    res = [None] * len(d)
    for e in d:
        res[getattr(cls, e)] = e
    return res


_fields_image = _build_enum_image(nodes_meta.fields)


def fields_image(idx):
    """String representation of field idx"""
    return _fields_image[idx]


_kind_image = _build_enum_image(nodes.Iir_Kind)


def kind_image(k):
    """String representation of Iir_Kind k"""
    return _kind_image[k]


_types_image = _build_enum_image(nodes_meta.types)


def types_image(t):
    """String representation of Nodes_Meta.Types t"""
    return _types_image[t]


_attr_image = _build_enum_image(nodes_meta.Attr)


def attr_image(a):
    """String representation of Nodes_Meta.Attr a"""
    return _attr_image[a]


def leftest_location(n):
    while True:
        if n == Null_Iir:
            return No_Location
        k = nodes.Get_Kind(n)
        if k == nodes.Iir_Kind.Array_Subtype_Definition:
            n = nodes.Get_Subtype_Type_Mark(n)
        else:
            return nodes.Get_Location(n)


def fields_iter(n):
    """Iterate on fields of node n"""
    if n == nodes.Null_Iir:
        return
    k = nodes.Get_Kind(n)
    first = nodes_meta.get_fields_first(k)
    last = nodes_meta.get_fields_last(k)
    for i in range(first, last + 1):
        yield nodes_meta.get_field_by_index(i)


def chain_iter(n):
    """Iterate of a chain headed by node n"""
    while n != nodes.Null_Iir:
        yield n
        n = nodes.Get_Chain(n)


def chain_to_list(n):
    """Convert a chain headed by node n to a python list"""
    return [e for e in chain_iter(n)]


def nodes_iter(n):
    """Iterate of all nodes of n, including n.
    Nodes are returned only once."""
    if n == nodes.Null_Iir:
        return
#    print 'nodes_iter for {0}'.format(n)
    yield n
    for f in fields_iter(n):
        typ = nodes_meta.get_field_type(f)
#        print ' {0}: field {1} (type: {2})'.format(