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Avoid initializing Parser with invalid ParserStateMachine

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When a grammar fails to generate a parser the ParserStateMachine has a
null start state.  When this is passed to construct a Parser quietly
avoid creating any parser specific state, esp. ParserNode which will
assert if passed a null state.
This commit is contained in:
Charles Baker 2023-07-16 08:10:39 +12:00
parent 4ba3456df4
commit 4881754402
1 changed files with 7 additions and 4 deletions
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11
src/lalr/Parser.ipp
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@ -82,10 +82,13 @@ Parser<Iterator, UserData, Char, Traits, Allocator>::Parser( const ParserStateMa
++action;
}
nodes_.reserve( 64 );
user_data_.reserve( 64 );
nodes_.push_back( ParserNode(state_machine_->start_state, nullptr, 0, 1) );
user_data_.push_back( UserData() );
if ( state_machine_->start_state )
{
nodes_.reserve( 64 );
user_data_.reserve( 64 );
nodes_.push_back( ParserNode(state_machine_->start_state, nullptr, 0, 1) );
user_data_.push_back( UserData() );
}
}
/**