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# Glossary
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This document is intended to name and describe the concepts, functions and data structures inside Kaleidoscope.
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It is, as yet, incredibly incomplete.
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When describing an identifier of any kind from the codebase, it should be
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written using identical capitalization to its use in the code and surrounded by backticks: `identifierName`
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## Firmware Terminology
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These terms commonly arise when discussing the firmware.
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### Keyswitch
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A single physical input, such as a keyswitch or other input like a knob or a slider
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### Key number
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An integer representing a Keyswitch’s position in the “Physical Layout”
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### Physical Layout
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A mapping of keyswitches to key numbers
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### Key binding
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A mapping from a key number to a behavior.
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### `Key`
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A representation of a specific behavior. Most often a representation of a specific entry in the USB HID Usage Tables.
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### Keymap
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A list of key bindings for all keyswitchess on the Physical Layout
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### Keymaps
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An ordered list of all the Keymaps installed on a keyboard.
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### Layer
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An entry in that ordered list of keymaps. Each layer has a unique id number that does not change. Layer numbers start at 0.
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### Active Layer Stack
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An ordered list of all the currently-active layers, in the order they should be evaluated when figuring out what a key does.
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### Override Layer
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A special layer that’s always active and evaluated before checking keys in the “Active layer stack”
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## Keyswitch state
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### Pressed
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The state of a keyswitch that has been actuated by the user or a routine acting on behalf of the user
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### Unpressed
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The state of a keyswitch that is not currently actuated
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### Toggled on
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The state of a keyswitch that was not pressed during the last scan cycle and is now pressed.
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### Toggled off
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The state of a keyswitch that was pressed during the last scan cycle and is no longer pressed.
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### Cycle
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The `loop` method in one's sketch file is the heart of the firmware. It runs -
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as the name suggests - in a loop. We call these runs cycles. A lot of things
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happen within a cycle: from key scanning, through key event handling, LED
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animations, and so on and so forth.
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### Event handler
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A function, usually provided by a [`Plugin`](#plugin) that is run by a [`Hook`](#hook).
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At the time of this writing, the following event handlers are run by hooks:
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- `onSetup`: Run once, when the plugin is initialised during
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`Kaleidoscope.setup()`.
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- `beforeEachCycle`: Run as the first thing at the start of each [cycle](#cycle).
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- `onKeyswitchEvent`: Run for every non-idle key, in each [cycle](#cycle) the
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key isn't idle in. If a key gets pressed, released, or is held, it is not
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considered idle, and this event handler will run for it too.
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- `beforeReportingState`: Runs each [cycle](#cycle) right before sending the
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various reports (keys pressed, mouse events, etc) to the host.
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- `afterEachCycle`: Runs at the very end of each [cycle](#cycle).
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### Hook
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A point where the core firmware calls [event handlers](#event-handler), allowing
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[plugins](#plugin) to augment the firmware behaviour, by running custom code.
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### Plugin
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An Arduino library prepared to work with Kaleidoscope. They implement methods
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from the `kaleidoscope::Plugin` (usually a subset of them). See [event
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handlers](#event-handler) above for a list of methods.
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## Testing
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These terms arise when discussing the testing framworks and related tests.
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### Sim Harness
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An abstraction used in testing to inject events into or invoke actions on the
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simulated firmware. This abstraction comprises half of the interface to the
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[test simulator](#test-simulator).
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### Sim State
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An abstraction used in testing to encapsulate, snapshot, and examine firmware
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state. This abstraction comprises half of the interface to the [test
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simulator](#test-simulator).
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### Test
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An indivial assertion or expectation that must hold for a [test
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case](#test-case) to pass.
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### Test Case
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An indivual `TEST*` macro invocation. Its body consists of one or [tests](#test)
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and optionally other code, e.g. to invoke the [test harness](#test-harness).
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Note that gtest uses the non-standard term _Test_ for what we call a [Test
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Case](#test-case).
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### Test File
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An individual file containing one or more [test suites](#test-suite).
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### Test Fixture
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A class comprising setup, teardown, and other code and common state to make
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writing [test cases](#test-case) easieer. A fresh object of the fixture class
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associated with a [test suite](#test-suite) is constructed for each run of each
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[teset case](#test-case) in the [test suite](#test-suite).
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### Test Simulator
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An abstraction wrapping a virtual firmware build that allows performing
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actions against the virtual firmware and reading state out of the virtual
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firmware. The interface to the test simular is comprised of the [sim
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harness](#sim-harness) and the [sim state](#sim-state).
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### Test Suite
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A collection of related [test cases](#test-case), optionally with an associated
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[test fixture](#test-fixture).
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