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LR0: Removed ::getClosure, it's form is wrong

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This commit is contained in:
Paul Beckingham 2016-01-03 16:36:30 -05:00
parent 819beb5909
commit 71d216ea49
2 changed files with 0 additions and 33 deletions
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32
src/LR0.cpp
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@ -85,38 +85,6 @@ void LR0::initialize (const Grammar& grammar)
// TODO Now recursively fill in the rest.
}
////////////////////////////////////////////////////////////////////////////////
// Aho/Sethi/Ullman, p223
//
// function closure (I);
// begin
// J := I;
// repeat
// for each item A --> alpha . B beta in J and each production
// B --> gamma of G such that B -> . gamma is not in J do
// add B --> . gamma to J
// until no more items can be added to J;
// return J
// end
LR0::Closure LR0::getClosure (const Closure& items) const
{
LR0::Closure closure;
for (auto& item : items)
{
// closure(I) includes I.
closure.push_back (item);
// Obtain all the expected symbols.
for (auto& exp : getExpected (items))
{
std::cout << "# Expecting " << exp << "\n";
std::cout << "# Add expansion of " << exp << "\n";
}
}
return closure;
}
////////////////////////////////////////////////////////////////////////////////
// Collect a unique set of expected symbols from the closure.
std::set <std::string> LR0::getExpected (const Closure& closure) const

1
src/LR0.h
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@ -68,7 +68,6 @@ public:
};
private:
Closure getClosure (const Closure&) const;
std::set <std::string> getExpected (const Closure&) const;
Closure expand (const std::string&) const;