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LR0: Implemented full ::expand method

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This commit is contained in:
Paul Beckingham 2016-01-03 00:44:00 -05:00
parent f4bff57b09
commit 819beb5909
1 changed files with 22 additions and 1 deletions
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23
src/LR0.cpp
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@ -133,10 +133,31 @@ std::set <std::string> LR0::getExpected (const Closure& closure) const
// Add all items to the result set matching the production rule for symbol. // Add all items to the result set matching the production rule for symbol.
LR0::Closure LR0::expand (const std::string& symbol) const LR0::Closure LR0::expand (const std::string& symbol) const
{ {
std::set <std::string> seen;
LR0::Closure result; LR0::Closure result;
for (auto& rule : _augmented) for (auto& rule : _augmented)
{
if (rule[0] == symbol) if (rule[0] == symbol)
result.push_back (Item (rule)); {
Item item (rule);
result.push_back (item);
seen.insert (rule[0]);
auto nextSymbol = item.next ();
if (seen.find (nextSymbol) == seen.end ())
{
for (auto& rule : _augmented)
{
if (rule[0] == nextSymbol)
{
result.push_back (Item (rule));
seen.insert (nextSymbol);
}
}
}
}
}
return result; return result;
} }