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114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//
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// Typer.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 19/06/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Typer_hpp
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#define Typer_hpp
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#include <memory>
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#include <string>
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#include "../KeyboardMachine.hpp"
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#include "../../ClockReceiver/ClockReceiver.hpp"
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namespace Utility {
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/*!
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An interface that provides a mapping from logical characters to the sequence of keys
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necessary to type that character on a given machine.
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*/
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class CharacterMapper {
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public:
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/// @returns The EndSequence-terminated sequence of keys that would cause @c character to be typed.
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virtual uint16_t *sequence_for_character(char character) = 0;
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protected:
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typedef uint16_t KeySequence[16];
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/*!
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Provided in the base class as a convenience: given the lookup table of key sequences @c sequences,
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with @c length entries, returns the sequence for character @c character if it exists; otherwise
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returns @c nullptr.
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*/
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uint16_t *table_lookup_sequence_for_character(KeySequence *sequences, std::size_t length, char character);
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};
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/*!
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Provides a stateful mechanism for typing a sequence of characters. Each character is mapped to a key sequence
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by a character mapper. That key sequence is then replayed to a delegate.
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Being given a delay and frequency at construction, the run_for interface can be used to produce time-based
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typing. Alternatively, an owner may decline to use run_for and simply call type_next_character each time a
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fresh key transition is ready to be consumed.
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*/
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class Typer {
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public:
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class Delegate: public KeyboardMachine::KeyActions {
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public:
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virtual void typer_reset(Typer *typer) = 0;
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};
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Typer(const std::string &string, HalfCycles delay, HalfCycles frequency, std::unique_ptr<CharacterMapper> character_mapper, Delegate *delegate);
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void run_for(const HalfCycles duration);
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bool type_next_character();
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bool is_completed();
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const char BeginString = 0x02; // i.e. ASCII start of text
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const char EndString = 0x03; // i.e. ASCII end of text
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private:
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std::string string_;
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std::size_t string_pointer_ = 0;
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HalfCycles frequency_;
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HalfCycles counter_;
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int phase_ = 0;
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Delegate *delegate_;
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std::unique_ptr<CharacterMapper> character_mapper_;
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bool try_type_next_character();
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};
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/*!
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Provides a default base class for type recipients: classes that want to attach a single typer at a time and
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which may or may not want to nominate an initial delay and typing frequency.
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*/
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class TypeRecipient: public Typer::Delegate {
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protected:
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/// Attaches a typer to this class that will type @c string using @c character_mapper as a source.
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void add_typer(const std::string &string, std::unique_ptr<CharacterMapper> character_mapper) {
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typer_.reset(new Typer(string, get_typer_delay(), get_typer_frequency(), std::move(character_mapper), this));
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}
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/*!
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Provided in order to conform to that part of the Typer::Delegate interface that goes above and
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beyond KeyboardMachine::Machine; responds to the end of typing by clearing all keys.
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*/
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void typer_reset(Typer *typer) {
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clear_all_keys();
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// It's unsafe to deallocate typer right now, since it is the caller, but also it has a small
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// memory footprint and it's desireable not to imply that the subclass need call it any more.
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// So shuffle it off into a siding.
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previous_typer_ = std::move(typer_);
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typer_ = nullptr;
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}
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virtual HalfCycles get_typer_delay() { return HalfCycles(0); }
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virtual HalfCycles get_typer_frequency() { return HalfCycles(0); }
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std::unique_ptr<Typer> typer_;
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private:
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std::unique_ptr<Typer> previous_typer_;
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};
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}
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#endif /* Typer_hpp */
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