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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "parsetable.h"
#include "lalr.h"
#include <QtCore/qtextstream.h>
ParseTable::ParseTable (QTextStream &o):
out (o)
{
}
void ParseTable::operator () (Automaton *aut)
{
Grammar *g = aut->_M_grammar;
int rindex = 1;
for (RulePointer rule = g->rules.begin (); rule != g->rules.end (); ++rule)
out << rindex++ << ")\t" << *rule << Qt::endl;
out << Qt::endl << Qt::endl;
int index = 0;
for (StatePointer state = aut->states.begin (); state != aut->states.end (); ++state)
{
out << "state " << index++ << Qt::endl << Qt::endl;
for (ItemPointer item = state->kernel.begin (); item != state->kernel.end (); ++item)
{
out << " * " << *item;
if (item->dot == item->end_rhs ())
out << " " << aut->lookaheads [item];
out << Qt::endl;
}
bool first = true;
for (Bundle::iterator arrow = state->bundle.begin (); arrow != state->bundle.end (); ++arrow)
{
if (! g->isTerminal (arrow.key ()))
continue;
if (first)
out << Qt::endl;
first = false;
out << " " << *arrow.key () << " shift, and go to state " << std::distance (aut->states.begin (), *arrow) << Qt::endl;
}
first = true;
for (ItemPointer item = state->closure.begin (); item != state->closure.end (); ++item)
{
if (item->dot != item->end_rhs () || item->rule == state->defaultReduce)
continue;
if (first)
out << Qt::endl;
first = false;
const auto lookaheads = aut->lookaheads.value(item);
for (const Name &la : lookaheads)
out << " " << *la << " reduce using rule " << aut->id (item->rule) << " (" << *item->rule->lhs << ")" << Qt::endl;
}
first = true;
for (Bundle::iterator arrow = state->bundle.begin (); arrow != state->bundle.end (); ++arrow)
{
if (! g->isNonTerminal (arrow.key ()))
continue;
if (first)
out << Qt::endl;
first = false;
out << " " << *arrow.key () << " go to state " << std::distance (aut->states.begin (), *arrow) << Qt::endl;
}
if (state->defaultReduce != g->rules.end ())
{
out << Qt::endl
<< " $default reduce using rule " << aut->id (state->defaultReduce) << " (" << *state->defaultReduce->lhs << ")" << Qt::endl;
}
out << Qt::endl;
}
}
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