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// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#ifdef __GNUG__
#pragma implementation
#endif
#include "splib.h"
#include "LinkProcess.h"
// ParserState is used for access to parser messages
#include "ParserState.h"
#include "MessageArg.h"
#include "ParserMessages.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
LinkProcess::LinkProcess()
{
}
void LinkProcess::init(const ConstPtr<ComplexLpd> &lpd)
{
lpd_ = lpd;
open_.clear();
open_.insert(new LinkProcessOpenElement(lpd_->initialLinkSet()));
}
Boolean LinkProcess::startElement(const ElementType *element,
const AttributeList &attributes,
const Location &location,
Messenger &mgr,
const AttributeList *&linkAttributes,
const ResultElementSpec *&resultElementSpec)
{
if (lpd_.isNull()) {
linkAttributes = 0;
resultElementSpec = 0;
return 1;
}
const StringC *id = attributes.getId();
if (id) {
const IdLinkRuleGroup *p = lpd_->lookupIdLink(*id);
if (p) {
size_t selected;
if (p->nLinkRules() > 1) {
linkAttributes_.resize(p->nLinkRules());
for (size_t i = 0; i < linkAttributes_.size(); i++)
linkAttributes_[i] = &p->linkRule(i).attributes();
if (!selectLinkRule(linkAttributes_,
location,
selected))
return 0;
}
else
selected = 0;
const IdLinkRule &rule = p->linkRule(selected);
open_.insert(new LinkProcessOpenElement(open_.head()->current,
rule));
linkAttributes = &rule.attributes();
resultElementSpec = &rule.resultElementSpec();
if (!rule.isAssociatedWith(element)) {
mgr.setNextLocation(location);
mgr.message(ParserMessages::idlinkElementType,
StringMessageArg(element->name()),
StringMessageArg(*id));
}
return 1;
}
}
const LinkSet *currentLinkSet = open_.head()->current;
size_t nRules = currentLinkSet->nLinkRules(element);
if (nRules > 0) {
size_t selected;
if (nRules > 1) {
linkAttributes_.resize(nRules);
for (size_t i = 0; i < nRules; i++)
linkAttributes_[i]
= ¤tLinkSet->linkRule(element, i).attributes();
if (!selectLinkRule(linkAttributes_,
location,
selected))
return 0;
}
else
selected = 0;
const SourceLinkRule &rule = currentLinkSet->linkRule(element, selected);
open_.insert(new LinkProcessOpenElement(open_.head()->current,
rule));
linkAttributes = &rule.attributes();
resultElementSpec = &rule.resultElementSpec();
return 1;
}
// FIXME construct attributes from attribute definition list
linkAttributes = 0;
resultElementSpec = 0;
open_.insert(new LinkProcessOpenElement(open_.head()->current));
return 1;
}
void LinkProcess::endElement()
{
if (lpd_.isNull())
return;
LinkProcessOpenElement *top = open_.get();
if (top->post)
open_.head()->current = top->post;
else if (top->postRestore)
open_.head()->current = open_.head()->restore;
delete top;
}
void LinkProcess::uselink(const LinkSet *linkSet,
Boolean restore,
const Lpd *lpd)
{
if (lpd_.isNull())
return;
if (lpd != lpd_.pointer())
return;
if (restore)
open_.head()->current = open_.head()->restore;
else if (linkSet)
open_.head()->current = linkSet;
}
size_t LinkProcess::nImpliedLinkRules() const
{
if (!open_.head())
return 0;
return open_.head()->current->nImpliedLinkRules();
}
const ResultElementSpec &LinkProcess::impliedLinkRule(size_t i) const
{
return open_.head()->current->impliedLinkRule(i);
}
// Usually redefined by application.
Boolean LinkProcess::selectLinkRule(const Vector<const AttributeList *> &,
const Location &,
size_t &selected)
{
selected = 0;
return 1;
}
void LinkProcess::clear()
{
open_.clear();
lpd_.clear();
linkAttributes_.clear();
}
void LinkProcess::swap(LinkProcess &to)
{
open_.swap(to.open_);
lpd_.swap(to.lpd_);
linkAttributes_.swap(to.linkAttributes_);
}
LinkProcessOpenElement::LinkProcessOpenElement(const LinkSet *cur,
const SourceLinkRule &rule)
{
current = rule.uselink();
if (!current)
current = cur;
restore = cur;
post = rule.postlink();
postRestore = rule.postlinkRestore();
}
LinkProcessOpenElement::LinkProcessOpenElement(const LinkSet *cur)
{
restore = current = cur;
post = 0;
postRestore = 0;
}
#ifdef SP_NAMESPACE
}
#endif
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