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Added: a shout-out when the tape has been exhausted.

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This commit is contained in:
Thomas Harte 2017-06-08 21:32:27 -04:00
parent c6e48dfd56
commit bc0d70b2f7
1 changed files with 14 additions and 0 deletions
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14
Storage/Tape/Parsers/TapeParser.hpp
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@ -43,6 +43,7 @@ template <typename WaveType, typename SymbolType> class Parser {
while(!has_next_symbol_ && !tape->is_at_end()) { while(!has_next_symbol_ && !tape->is_at_end()) {
process_pulse(tape->get_next_pulse()); process_pulse(tape->get_next_pulse());
} }
if(tape->is_at_end()) mark_end();
has_next_symbol_ = false; has_next_symbol_ = false;
return next_symbol_; return next_symbol_;
} }
@ -65,6 +66,12 @@ template <typename WaveType, typename SymbolType> class Parser {
*/ */
virtual void process_pulse(Storage::Tape::Tape::Pulse pulse) = 0; virtual void process_pulse(Storage::Tape::Tape::Pulse pulse) = 0;
/*!
An optional implementation for subclasses; called to announce that the tape has ended: that
no more process_pulse calls will occur.
*/
virtual void mark_end() {}
protected: protected:
/*! /*!
@ -103,6 +110,13 @@ template <typename WaveType, typename SymbolType> class Parser {
error_flag_ = true; error_flag_ = true;
} }
/*!
@returns `true` if there is no data left on the tape and the WaveType queue has been exhausted; `false` otherwise.
*/
bool is_at_end(const std::shared_ptr<Storage::Tape::Tape> &tape) {
return tape->is_at_end() && wave_queue_.empty() && !has_next_symbol_;
}
private: private:
bool error_flag_; bool error_flag_;