CLK/Machines/Typer.cpp

//
//  Typer.cpp
//  Clock Signal
//
//  Created by Thomas Harte on 19/06/2016.
//  Copyright © 2016 Thomas Harte. All rights reserved.
//

#include "Typer.hpp"
#include <stdlib.h>

using namespace Utility;

Typer::Typer(const char *string, int delay, int frequency, Delegate *delegate) :
	counter_(-delay), frequency_(frequency), string_pointer_(0), delegate_(delegate), phase_(0)
{
	size_t string_size = strlen(string) + 3;
	string_ = (char *)malloc(string_size);
	snprintf(string_, strlen(string) + 3, "%c%s%c", Typer::BeginString, string, Typer::EndString);
}

void Typer::update(int duration)
{
	if(string_)
	{
		if(counter_ < 0 && counter_ + duration >= 0)
		{
			if(!type_next_character())
			{
				delegate_->typer_reset(this);
			}
		}

		counter_ += duration;
		while(string_ && counter_ > frequency_)
		{
			counter_ -= frequency_;
			if(!type_next_character())
			{
				delegate_->typer_reset(this);
			}
		}
	}
}

bool Typer::type_next_character()
{
	if(string_ == nullptr) return false;

	if(delegate_->typer_set_next_character(this, string_[string_pointer_], phase_))
	{
		phase_ = 0;
		if(!string_[string_pointer_])
		{
			free(string_);
			string_ = nullptr;
			return false;
		}

		string_pointer_++;
	}
	else
	{
		phase_++;
	}

	return true;
}

Typer::~Typer()
{
	free(string_);
}

#pragma mark - Delegate

bool Typer::Delegate::typer_set_next_character(Utility::Typer *typer, char character, int phase)
{
	uint16_t *sequence = sequence_for_character(typer, character);
	if(!sequence) return true;

	if(!phase) clear_all_keys();
	else
	{
		set_key_state(sequence[phase - 1], true);
		return sequence[phase] == Typer::Delegate::EndSequence;
	}

	return false;
}

uint16_t *Typer::Delegate::sequence_for_character(Typer *typer, char character)
{
	return nullptr;
}