/**
* Define a symbol with a particular Signature in the current scope. If
* redefinition is explicitly allowed (as it might have to be for internals),
* shut up about redefined symbols.
*/
void Context::define(const Signature& signature,
std::shared_ptr<const Expression> body, bool allow_redefinition) {
if (!allow_redefinition) {
auto position = stack.front().symbols.find(signature);
if (position != stack.front().symbols.end()) {
std::ostringstream message;
message << "Redefinition of \"" << signature.name
<< "\"";
if (!stack.front().name.empty())
message << " in namespace \"" << stack.front().name << "\"";
message << " already defined as \"" << position->first.canonical
<< "\".";
throw std::runtime_error(message.str());
}
}
stack.front().symbols[signature] = body;
std::string qualified = signature.name;
auto frame = stack.begin();
auto previous = frame++;
while (frame != stack.end() && !previous->name.empty()) {
qualified = previous->name + "::" + qualified;
Signature prefixed(qualified, signature);
frame->symbols[prefixed] = body;
previous = frame++;
}
}
/*
** Add the directory icon.
*/
PUBLIC BOOL HTIcon_addDir (const char * url, const char * prefix, char * alt)
{
if ((icon_dir = (HTIconNode *) HT_CALLOC(1,sizeof(HTIconNode))) == NULL)
HT_OUTOFMEM("HTAddBlankIcon");
if (url) icon_dir->icon_url = prefixed(url, prefix);
if (alt) StrAllocCopy(icon_dir->icon_alt, alt);
alt_resize(alt);
HTTRACE(PROT_TRACE, "Icon add.... DIRECTORY => SRC=\"%s\" ALT=\"%s\"\n" _ url _
alt ? alt : "");
return YES;
}
/*
** HTAddIcon(url, alt, type_templ) adds icon:
**
** <IMG SRC="url" ALT="[alt]">
**
** for files for which content-type or content-encoding matches
** type_templ. If type_templ contains a slash, it is taken to be
** a content-type template. Otherwise, it is a content-encoding
** template.
*/
PUBLIC BOOL HTIcon_add (const char * url, const char * prefix,
char * alt, char * type_templ)
{
if (url && type_templ) {
HTIconNode * node;
if ((node = (HTIconNode *) HT_CALLOC(1,sizeof(HTIconNode))) == NULL)
HT_OUTOFMEM("HTAddIcon");
if (url) node->icon_url = prefixed(url, prefix);
if (alt) StrAllocCopy(node->icon_alt, alt);
if (type_templ) StrAllocCopy(node->type_templ, type_templ);
if (!icons) icons = HTList_new();
HTList_addObject(icons, (void *) node);
alt_resize(alt);
HTTRACE(PROT_TRACE, "AddIcon..... %s => SRC=\"%s\" ALT=\"%s\"\n" _
type_templ _ url _ alt ? alt : "");
return YES;
}
return NO;
}
PUBLIC void HTStdIconInit ARGS1(CONST char *, url_prefix)
{
CONST char * p = url_prefix ? url_prefix : "/internal-icon/";
HTAddBlankIcon (prefixed(p,"blank.xbm"), NULL );
HTAddDirIcon (prefixed(p,"directory.xbm"),"DIR" );
HTAddParentIcon (prefixed(p,"back.xbm"), "UP" );
HTAddUnknownIcon(prefixed(p,"unknown.xbm"), NULL );
HTAddIcon(prefixed(p,"unknown.xbm"), NULL, "*/*");
HTAddIcon(prefixed(p,"binary.xbm"), "BIN", "binary");
HTAddIcon(prefixed(p,"unknown.xbm"), NULL, "www/unknown");
HTAddIcon(prefixed(p,"text.xbm"), "TXT", "text/*");
HTAddIcon(prefixed(p,"image.xbm"), "IMG", "image/*");
HTAddIcon(prefixed(p,"movie.xbm"), "MOV", "video/*");
HTAddIcon(prefixed(p,"sound.xbm"), "AU", "audio/*");
HTAddIcon(prefixed(p,"compressed.xbm"), "CMP", "compress");
HTAddIcon(prefixed(p,"compressed.xbm"), "GZP", "gzip");
HTAddIcon(prefixed(p,"index.xbm"), "IDX", "application/x-gopher-index");
HTAddIcon(prefixed(p,"index2.xbm"), "CSO", "application/x-gopher-cso");
HTAddIcon(prefixed(p,"telnet.xbm"), "TEL", "application/x-gopher-telnet");
HTAddIcon(prefixed(p,"unknown.xbm"), "DUP", "application/x-gopher-duplicate");
HTAddIcon(prefixed(p,"unknown.xbm"), "TN", "application/x-gopher-tn3270");
}
