mirror of
https://github.com/TomHarte/CLK.git
synced 2024-08-16 16:28:59 +00:00
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
//
|
|
// TapeParser.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 05/09/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef TapeParser_hpp
|
|
#define TapeParser_hpp
|
|
|
|
namespace StaticAnalyer {
|
|
|
|
/*!
|
|
A partly-abstract base class to help in the authorship of tape format parsers;
|
|
provides hooks for pulse classification from pulses to waves and for symbol identification from
|
|
waves.
|
|
|
|
Very optional, not intended to box in the approaches taken for analysis.
|
|
*/
|
|
template <typename WaveType, typename SymbolType> class TapeParser {
|
|
public:
|
|
/// Instantiates a new parser with the supplied @c tape.
|
|
TapeParser(const std::shared_ptr<Storage::Tape::Tape> &tape) : _tape(tape), _has_next_symbol(false), _error_flag(false) {}
|
|
|
|
/// Resets the error flag.
|
|
void reset_error_flag() { _error_flag = false; }
|
|
/// @returns @c true if an error has occurred since the error flag was last reset; @c false otherwise.
|
|
bool get_error_flag() { return _error_flag; }
|
|
/// @returns @c true if the encapsulated tape has reached its end; @c false otherwise.
|
|
bool is_at_end() { return _tape->is_at_end(); }
|
|
|
|
protected:
|
|
bool _error_flag;
|
|
|
|
/*!
|
|
Adds @c wave to the back of the list of recognised waves and calls @c inspect_waves to check for a new symbol.
|
|
|
|
Expected to be called by subclasses from @c process_pulse as and when recognised waves arise.
|
|
*/
|
|
void push_wave(WaveType wave)
|
|
{
|
|
_wave_queue.push_back(wave);
|
|
inspect_waves(_wave_queue);
|
|
}
|
|
|
|
/*!
|
|
Removes @c nunber_of_waves waves from the front of the list.
|
|
|
|
Expected to be called by subclasses from @c process_pulse if it is recognised that the first set of waves
|
|
do not form a valid symbol.
|
|
*/
|
|
void remove_waves(int number_of_waves)
|
|
{
|
|
_wave_queue.erase(_wave_queue.begin(), _wave_queue.begin()+number_of_waves);
|
|
}
|
|
|
|
/*!
|
|
Sets @c symbol as the newly-recognised symbol and removes @c nunber_of_waves waves from the front of the list.
|
|
|
|
Expected to be called by subclasses from @c process_pulse when it recognises that the first @c number_of_waves
|
|
waves together represent @c symbol.
|
|
*/
|
|
void push_symbol(SymbolType symbol, int number_of_waves)
|
|
{
|
|
_has_next_symbol = true;
|
|
_next_symbol = symbol;
|
|
remove_waves(number_of_waves);
|
|
}
|
|
|
|
/*!
|
|
Asks the parser to continue taking pulses from the tape until either the subclass next declares a symbol
|
|
or the tape runs out, returning the most-recently declared symbol.
|
|
*/
|
|
SymbolType get_next_symbol()
|
|
{
|
|
while(!_has_next_symbol && !is_at_end())
|
|
{
|
|
process_pulse(_tape->get_next_pulse());
|
|
}
|
|
_has_next_symbol = false;
|
|
return _next_symbol;
|
|
}
|
|
|
|
private:
|
|
virtual void process_pulse(Storage::Tape::Tape::Pulse pulse) = 0;
|
|
virtual void inspect_waves(const std::vector<WaveType> &waves) = 0;
|
|
|
|
std::vector<WaveType> _wave_queue;
|
|
SymbolType _next_symbol;
|
|
bool _has_next_symbol;
|
|
|
|
std::shared_ptr<Storage::Tape::Tape> _tape;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* TapeParser_hpp */
|