Keyboard Support

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Debug Window

Debug window - Debug State

The debug window is shown at the bottom of an keyboard editor when debugging the keyboard. There are several user interface areas: The debugger input window, the debugger status window, a debugger toolbar (usually docked under the menu), and the status bar will show the current debugger status.

Debugger input window

Debug window - Debug State

The debugger input window is used for typing input to test the keyboard. In the top half of this window, input you type while testing your keyboard will be displayed, exactly the same as in use, with one exception: deadkeys will be shown visually with an OBJ symbol.

The lower half of the window shows a grid of the characters to the virtual left of the insertion point, or the selected characters if you make a selection. Deadkeys will be identified in the grid. The grid will show characters in right-to-left scripts in backing store order, from left to right. If there are more characters in your text than can fit on the screen, then only those that fit will be shown in the grid.

Debug controls

The debug menu and debug toolbar control the debugger.

Debug toolbar

Debug menu

Set/Clear breakpoint
A breakpoint can be put on a line of code to ask Keyman Developer to stop and show what is happening in the keyboard layout when that line is reached. Typically, you would put a breakpoint on a particular rule, so you could debug an unexpected behaviour on that rule.
Start Debugging
Starts the debugger
Stop Debugger
Stops the current debug session
Single Step Mode
When this option is active, you will step through every group and rule that your keyboard applies when a keystroke is pressed. The Step Forward and Run controls are only relevant in Single Step Mode.
Step Forward
Move to the next step in your keyboard code.
Stop processing the current keystroke event in single step mode (unless a breakpoint is hit). The next keystroke event will drop into single step mode again.
Use the Pause button or press Shift+Esc to pause the debugger. When the debugger is paused, it will not accept any input, and ordinary shortcut keys (Shift+F5, Alt+Tab, etc.) will function as usual. Press Pause again to resume debugging.
System keyboard
The system keyboard layout currently being used. You can test your keyboard with a different underlying layout by selecting Select System Keyboard from the Debug menu.

Debug State box

The debug state box shows the internal state of the keyboard interpreter.


Debug window - Debug State

This window shows the current keystroke state, and the sequence of keystrokes that were typed to arrive at this state. Clearing the text in the debug window will also clear the keystroke log; as will pressing the Restart button.

The Restart button is disabled while stepping through an event.


Debug window - Debug Elements

This shows the elements that make up rule currently being processed: the context, the key, and also what the output will be. If the rule uses stores, the contents of the store will be shown in the right-hand column, with the matched letter in red.

Call Stack

Debug window - Debug Call stack

Here all the lines that have been processed to this point are shown in a list. You can double-click on any entry in the list to display the line in the keyboard source.


Debug window - Debug Deadkeys

This lists all the deadkeys that are currently in the context. You can select one from the list to see it highlighted in the debug input box. This information can also be seen in the character grid in the lower half of the debugger input window.

Regression Testing

Debug window - Debug Regression Test

The idea in regression testing is to record a sequence of keystrokes and the output the keyboard produced, in order to test for the same behaviour when you make changes to the keyboard.

Use Start Log/Stop Log to record the input and output. You can then use Run Test to run the test again, or go the Options menu to clear the log, or save or load a test, or use the batch mode to run several tests in a row.

If the output produced while running a test is different to that stored when recording it, Keyman will halt the test on the line where the failure occurred, and activate Single Step mode.

Status bar

The input status is shown in the second pane of the status bar. It can show one of the following messages:

Ready for input
The debugger is waiting for more input
Focused for input
The debugger is waiting for more input, and the Debug Input window is active
The debugger is paused
Receiving events
The debugger is processing input
The debugger is active during Single Step mode or after a breakpoint

Test mode

Enter test mode by clicking the Test Mode button on the debugger toolbar.

The test mode lets you test your keyboard without the debugger being active. This lets you test functionality that is not available within the debugger - primarily IMX code.

Once in test mode, no debugger controls are available.

You can see the character codes for the current or selected characters in the status bar, which can be useful when debugging your keyboard.