Variable GetFromHash()
{
SkipCharWS('{');
// we can't make any assumptions about ordering here, as JSON
// emitters can blindly reorder hashes
string h_tag = null;
string h_anchor = null;
Dictionary <string, string> h_key_ind = null;
VarHash h_val_ind = null;
VarHash zyg = new VarHash();
bool comma = false;
while (true)
{
if (SkipWhite(true) == '}')
{
break;
}
if (comma)
{
SkipChar(',');
}
comma = true;
SkipWhite(false);
GetString();
if (s_content_type == NONE && s_anchor == null && s_tag == "")
{
if (h_tag != null)
{
Err("Tag specified twice");
}
h_tag = GetSimpleStringValue();
}
else if (s_content_type == NONE && s_tag == null && s_anchor == "")
{
if (h_anchor != null)
{
Err("Anchor specified twice");
}
h_anchor = GetSimpleStringValue();
}
else if (s_content_type == NONE)
{
if (s_anchor == null || s_tag != null)
{
Err("Invalid hash key form");
}
string k1 = s_anchor;
if (h_key_ind == null)
{
h_key_ind = new Dictionary <string, string>();
}
if (h_key_ind.ContainsKey(k1))
{
Err("Key alias &" + k1 + " specified twice");
}
SkipCharWS(':');
if (SkipWhite(true) != '"')
{
Err("Non-scalar hash keys NYI in Niecza Perl 6");
}
GetString();
if (s_tag != null || s_anchor != null || s_content_type != SCALAR)
{
Err("Typed hash keys NYI in Niecza Perl 6");
}
h_key_ind[k1] = s_content;
}
else if (s_content_type == ALIAS)
{
string k1 = s_content;
if (h_val_ind == null)
{
h_val_ind = new VarHash();
}
if (h_val_ind.ContainsKey(k1))
{
Err("Key alias *" + k1 + " used twice");
}
SkipCharWS(':');
h_val_ind[k1] = GetObj();
}
else if (s_content_type == DIRECTIVE)
{
Err("Got directive in hash key position");
}
else
{
if (s_tag != null || s_anchor != null)
{
Err("Typed hash keys NYI in Niecza Perl 6");
}
string k1 = s_content;
SkipCharWS(':');
zyg[k1] = GetObj();
}
}
SkipChar('}');
if (h_key_ind != null || h_val_ind != null)
{
h_key_ind = h_key_ind ?? new Dictionary <string, string>();
h_val_ind = h_val_ind ?? new VarHash();
foreach (KeyValuePair <string, string> kv in h_key_ind)
{
if (!h_val_ind.ContainsKey(kv.Key))
{
Err("No value provided for indirect key *" + kv.Key);
}
Variable val = h_val_ind[kv.Key];
h_val_ind.Remove(kv.Key);
if (zyg.ContainsKey(kv.Value))
{
Err("Indirect key &" + kv.Value + " collides with non-indirect key");
}
zyg[kv.Value] = val;
}
foreach (string k in h_val_ind.Keys)
{
Err("Indirect key &" + k + " is unused");
}
}
Variable obj;
if (h_tag != null)
{
if (!Utils.StartsWithInvariant("!perl6/", h_tag))
{
Err("Unsupported hash tag " + h_tag);
}
string s2 = "::GLOBAL::" + h_tag.Substring(7);
int cut = s2.LastIndexOf("::");
Variable v_cursor = setting.GetVar(s2.Substring(0, cut),
s2.Substring(cut + 2)).v;
if (v_cursor.Rw)
{
Err(s2.Substring(2) + " does not name a loaded global class");
}
P6any p_cursor = v_cursor.Fetch();
if (p_cursor.Isa(setting.HashMO))
{
if (p_cursor.mo.nslots != 0)
{
Err("Cannot thaw Hash subclass " + p_cursor.mo.name + "; it has attributes");
}
obj = BoxRW <VarHash>(zyg, p_cursor.mo);
}
else
{
P6opaque dyo = new P6opaque(p_cursor.mo);
for (int i = 0; i < dyo.mo.nslots; i++)
{
string sn = dyo.mo.all_slot[i];
if (!zyg.ContainsKey(sn))
{
Err("No value for attribute " + sn + " in thawed value of class " + dyo.mo.name);
}
dyo.slots[i] = zyg[sn];
zyg.Remove(sn);
}
foreach (string key in zyg.Keys)
{
Err("Attribute " + key + " not present in " + dyo.mo.name);
}
obj = Kernel.NewMuScalar(dyo);
}
}
else
{
obj = BoxRW <VarHash>(zyg, setting.HashMO);
}
if (h_anchor != null)
{
AddAnchor(h_anchor, obj.Fetch());
}
return(obj);
}