I completed the stage that takes keyboard layout files from XKB (X.Org) and converts them to XML documents, based on a keyboard layout Relax NG schema. Then, these XML documents can also be converted back to keyboard layout files.
Here is an imaginary example of a keyboard layout file.
// Keyboard layout for the Zzurope country (code: zz).
// Yeah.
partial alphanumeric_keys alternate_group hidden
xkb_symbols "bare" {
key <AE01> { [ 1, exclam, onesuperior, exclamdown ] };
};
partial alphanumeric_keys alternate_group
xkb_symbols "basic" {
name[Group1] = "ZZurope";
include "zz(bare)"
key <AD04> { [ r, R, ediaeresis, Ediaeresis ] };
key <AC07> { [ j, J, idiaeresis, Idiaeresis ] };
key <AB02> { [ x, X, oe, OE ] };
key <AB04> { [ v, V, registered, registered ] };
};
partial alphanumeric_keys alternate_group
xkb_symbols "extended" {
include "zz(basic)"
name[Group1] = "ZZurope Extended";
key.type = "THREE_LEVEL"; // We use three levels.
override key <AD01> { type[Group1] = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC",
[ U1C9, U1C8], [ any, U1C7 ] }; // q
override key <AD02> { [ U1CC, U1CB, any,U1CA ],
type[Group1] = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC" }; // w
key <BKSP> {
type[Group1]="CTRL+ALT",
symbols[Group1]= [ BackSpace, Terminate_Server ]
};
key <BKSR> { virtualMods = AltGr, [ 1, 2 ] };
modifier_map Control { Control_L };
modifier_map Mod5 { <LVL3>, <MDSW> };
key <BKST> { [1, 2,3, 4] };
};
When converted to an XML document, it looks like
<?xml version="1.0" encoding="UTF-8"?>
<layout layoutname="zz">
<symbols>
<mapoption>hidden</mapoption>
<mapoption>xkb_symbols</mapoption>
<mapname>bare</mapname>
<mapmaterial>
<tokenkey override="False">
<keycodename>AE01</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>1</symbol>
<symbol>exclam</symbol>
<symbol>onesuperior</symbol>
<symbol>exclamdown</symbol>
</symbolsgroup>
</keysymgroup>
</tokenkey>
</mapmaterial>
</symbols>
<symbols>
<mapoption>xkb_symbols</mapoption>
<mapname>basic</mapname>
<mapmaterial>
<tokenname name="ZZurope"/>
<tokeninclude>zz(bare)</tokeninclude>
<tokenkey override="False">
<keycodename>AD04</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>r</symbol>
<symbol>R</symbol>
<symbol>ediaeresis</symbol>
<symbol>Ediaeresis</symbol>
</symbolsgroup>
</keysymgroup>
</tokenkey>
<tokenkey override="False">
<keycodename>AC07</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>j</symbol>
<symbol>J</symbol>
<symbol>idiaeresis</symbol>
<symbol>Idiaeresis</symbol>
</symbolsgroup>
</keysymgroup>
</tokenkey>
<tokenkey override="False">
<keycodename>AB02</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>x</symbol>
<symbol>X</symbol>
<symbol>oe</symbol>
<symbol>OE</symbol>
</symbolsgroup>
</keysymgroup>
</tokenkey>
<tokenkey override="False">
<keycodename>AB04</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>v</symbol>
<symbol>V</symbol>
<symbol>registered</symbol>
<symbol>registered</symbol>
</symbolsgroup>
</keysymgroup>
</tokenkey>
</mapmaterial>
</symbols>
<symbols>
<mapoption>xkb_symbols</mapoption>
<mapname>extended</mapname>
<mapmaterial>
<tokenname name="ZZurope Extended"/>
<tokeninclude>zz(basic)</tokeninclude>
<tokentype>THREE_LEVEL</tokentype>
<tokenmodifiermap state="Control">
<keycode value="Control_L"/>
</tokenmodifiermap>
<tokenmodifiermap state="Mod5">
<keycodex value="LVL3"/>
<keycodex value="MDSW"/>
</tokenmodifiermap>
<tokenkey override="True">
<keycodename>AD01</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>U1C9</symbol>
<symbol>U1C8</symbol>
</symbolsgroup>
<symbolsgroup>
<symbol>any</symbol>
<symbol>U1C7</symbol>
</symbolsgroup>
<typegroup value="SEPARATE_CAPS_AND_SHIFT_ALPHABETIC"/>
</keysymgroup>
</tokenkey>
<tokenkey override="True">
<keycodename>AD02</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>U1CC</symbol>
<symbol>U1CB</symbol>
<symbol>any</symbol>
<symbol>U1CA</symbol>
</symbolsgroup>
<typegroup value="SEPARATE_CAPS_AND_SHIFT_ALPHABETIC"/>
</keysymgroup>
</tokenkey>
<tokenkey override="False">
<keycodename>BKSP</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>BackSpace</symbol>
<symbol>Terminate_Server</symbol>
</symbolsgroup>
<typegroup value="CTRL+ALT"/>
</keysymgroup>
</tokenkey>
<tokenkey override="False">
<keycodename>BKSR</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>1</symbol>
<symbol>2</symbol>
</symbolsgroup>
<tokenvirtualmodifiers value="AltGr"/>
</keysymgroup>
</tokenkey>
<tokenkey override="False">
<keycodename>BKST</keycodename>
<keysymgroup>
<symbolsgroup>
<symbol>1</symbol>
<symbol>2</symbol>
<symbol>3</symbol>
<symbol>4</symbol>
</symbolsgroup>
</keysymgroup>
</tokenkey>
</mapmaterial>
</symbols>
</layout>
When we convert the XML document back to the XKB format, it looks like
hidden xkb_symbols "bare"
{
key <AE01> { [ 1, exclam, onesuperior, exclamdown ] };
};
xkb_symbols "basic"
{
name = "ZZurope";
include "zz(bare)"
key <AD04> { [ r, R, ediaeresis, Ediaeresis ] };
key <AC07> { [ j, J, idiaeresis, Idiaeresis ] };
key <AB02> { [ x, X, oe, OE ] };
key <AB04> { [ v, V, registered, registered ] };
};
xkb_symbols "extended"
{
name = "ZZurope Extended";
include "zz(basic)"
key.type = "THREE_LEVEL";
modifier_map Control { Control_L };
modifier_map Mod5 { <LVL3>, <MDSW> };
override key <AD01> { [ U1C9, U1C8 ], [ any, U1C7 ], type = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC" };
override key <AD02> { [ U1CC, U1CB, any, U1CA ], type = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC" };
key <BKSP> { [ BackSpace, Terminate_Server ], type = "CTRL+ALT" };
key <BKSR> { [ 1, 2 ], virtualMods = AltGr };
key <BKST> { [ 1, 2, 3, 4 ] };
};
Some things are missing such as partial, alphanumeric_keys and alternate_group, which I discussed with Sergey and he said they should be ok to go away.
In addition, we simplify by keeping just Group1 (we do not specify it, as it is implied).
I performed the round-trip with all layout files, and all parsed and validated OK (there is some extra work with the level3 file remaining, though).
Some issues that are remaining, include
- Figuring out how to use XLink to link to documents in the same folder (+providing a parameter; the name of the variant), and how to represent that in the Relax NG schema.
- Sort the layout entries by keycode value.
Tags: fdo, planetellak by Simos Xenitellis
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