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import { keyName, base } from 'w3c-keyname';
import { Plugin } from 'prosemirror-state';

Bindings should map key names to [command](https://prosemirror.net/docs/ref/#commands)-style
functions, which will be called with `(EditorState, dispatch,
EditorView)` arguments, and should return true when they've handled
the key. Note that the view argument isn't part of the command
protocol, but can be used as an escape hatch if a binding needs to
directly interact with the UI.

Key names may be strings like `"Shift-Ctrl-Enter"`—a key
identifier prefixed with zero or more modifiers. Key identifiers
are based on the strings that can appear in
[`KeyEvent.key`](https:developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key).
Use lowercase letters to refer to letter keys (or uppercase letters
if you want shift to be held). You may use `"Space"` as an alias
for the `" "` name.

Modifiers can be given in any order. `Shift-` (or `s-`), `Alt-` (or
`a-`), `Ctrl-` (or `c-` or `Control-`) and `Cmd-` (or `m-` or
`Meta-`) are recognized. For characters that are created by holding
shift, the `Shift-` prefix is implied, and should not be added
explicitly.

You can use `Mod-` as a shorthand for `Cmd-` on Mac and `Ctrl-` on
other platforms.

You can add multiple keymap plugins to an editor. The order in
which they appear determines their precedence (the ones early in
the array get to dispatch first).
*/
function keymap(bindings) {
    return new Plugin({ props: { handleKeyDown: keydownHandler(bindings) } });
}
/**
Given a set of bindings (using the same format as
[`keymap`](https://prosemirror.net/docs/ref/#keymap.keymap)), return a [keydown
handler](https://prosemirror.net/docs/ref/#view.EditorProps.handleKeyDown) that handles them.
*/
function keydownHandler(bindings) {
    let map = normalize(bindings);
    return function (view, event) {
        let name = keyName(event), baseName, direct = map[modifiers(name, event)];
        if (direct && direct(view.state, view.dispatch, view))
            return true;
        // A character key
        if (name.length == 1 && name != " ") {
            if (event.shiftKey) {
                // In case the name was already modified by shift, try looking
                // it up without its shift modifier
                let noShift = map[modifiers(name, event, false)];
                if (noShift && noShift(view.state, view.dispatch, view))
                    return true;
            }
            if ((event.altKey || event.metaKey || event.ctrlKey) &&
                // Ctrl-Alt may be used for AltGr on Windows
                !(windows && event.ctrlKey && event.altKey) &&
                (baseName = base[event.keyCode]) && baseName != name) {
                // Try falling back to the keyCode when there's a modifier
                // active or the character produced isn't ASCII, and our table
                // produces a different name from the the keyCode. See #668,
                // #1060, #1529.
                let fromCode = map[modifiers(baseName, event)];
                if (fromCode && fromCode(view.state, view.dispatch, view))
                    return true;
            }
        }
        return false;
    };
}

export { keydownHandler, keymap };

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