ladybird/Userland/Libraries/LibVT/StateMachine.txt

// This file is used for automatically generating the ANSI escape sequence state machine
//
// The description of the state machine is taken from https://vt100.net/emu/dec_ansi_parser
// with added support for UTF-8 parsing

@name EscapeSequenceStateMachine
@namespace VT
@begin Ground

@anywhere {
    0x18         => (Ground, Execute)
    0x1a         => (Ground, Execute)
    0x1b         => (Escape, _)
}

Ground {
    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)

    [0x20..0x7f] => (_, Print)

    [0x80..0xc1] => (Ground, FailUTF8)
    [0xc2..0xdf] => (UTF81ByteNeeded, BeginUTF8)
    [0xe0..0xef] => (UTF82BytesNeeded, BeginUTF8)
    [0xf0..0xf4] => (UTF83BytesNeeded, BeginUTF8)
    [0xf5..0xff] => (Ground, FailUTF8)
}

UTF81ByteNeeded {
    [0x00..0x7f] => (Ground, FailUTF8)
    [0x80..0xbf] => (Ground, PrintUTF8)
    [0xc0..0xff] => (Ground, FailUTF8)
}

UTF82BytesNeeded {
    [0x00..0x7f] => (Ground, FailUTF8)
    [0x80..0xbf] => (UTF81ByteNeeded, AdvanceUTF8)
    [0xc0..0xff] => (Ground, FailUTF8)
}

UTF83BytesNeeded {
    [0x00..0x7f] => (Ground, FailUTF8)
    [0x80..0xbf] => (UTF82BytesNeeded, AdvanceUTF8)
    [0xc0..0xff] => (Ground, FailUTF8)
}

Escape {
    @entry Clear

    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)

    [0x20..0x2f] => (EscapeIntermediate, Collect)
    [0x30..0x4f] => (Ground, EscDispatch)
    0x50         => (DcsEntry, _)
    [0x51..0x57] => (Ground, EscDispatch)
    0x58         => (SosPmApcString, _)
    0x59         => (Ground, EscDispatch)
    0x5a         => (Ground, EscDispatch)
    0x5b         => (CsiEntry, _)
    0x5c         => (Ground, EscDispatch)
    0x5d         => (OscString, _)
    0x5e         => (SosPmApcString, _)
    0x5f         => (SosPmApcString, _)
    [0x60..0x7e] => (Ground, EscDispatch)
    0x7f         => (_, _)
}

EscapeIntermediate {
    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)
    [0x20..0x2f] => (_, Collect)
    [0x30..0x7e] => (Ground, EscDispatch)
    0x7f         => (_, _)
}

CsiEntry {
    @entry Clear

    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)

    [0x20..0x2f] => (CsiIntermediate, Execute)
    [0x30..0x39] => (CsiParam, Param)
    0x3a         => (CsiIgnore, _)
    0x3b         => (CsiParam, Param)
    [0x3c..0x3f] => (CsiParam, Collect)
    [0x40..0x7e] => (Ground, CsiDispatch)
    0x7f         => (_, _)
}

CsiIgnore {
    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)

    [0x20..0x3f] => (_, _)
    [0x40..0x7e] => (Ground, _)
    0x7f         => (_, _)
}

CsiParam {
    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)

    [0x20..0x2f] => (CsiIntermediate, Collect)
    [0x30..0x39] => (_, Param)
    0x3a         => (CsiIgnore, _)
    0x3b         => (_, Param)
    [0x3c..0x3f] => (CsiIgnore, _)
    [0x40..0x7e] => (Ground, CsiDispatch)
    0x7f         => (_, _)
}

CsiIntermediate {
    [0x00..0x17] => (_, Execute)
    0x19         => (_, Execute)
    [0x1c..0x1f] => (_, Execute)

    [0x20..0x2f] => (_, Collect)
    [0x30..0x3f] => (CsiIgnore, _)
    [0x40..0x7e] => (Ground, CsiDispatch)
    0x7f         => (_, _)
}

DcsEntry {
    @entry Clear

    [0x00..0x17] => (_, _)
    0x19         => (_, _)
    [0x1c..0x1f] => (_, _)

    [0x20..0x2f] => (DcsIntermediate, Collect)
    [0x30..0x39] => (DcsParam, Param)
    0x3a         => (DcsIgnore, _)
    0x3b         => (DcsParam, Param)
    [0x3c..0x3f] => (DcsParam, Collect)
    [0x40..0x7e] => (DcsPassthrough, _)
    0x7f         => (_, _)
}

DcsIntermediate {
    [0x00..0x17] => (_, _)
    0x19         => (_, _)
    [0x1c..0x1f] => (_, _)

    [0x20..0x2f] => (_, Collect)
    [0x30..0x3f] => (DcsIgnore, _)
    [0x40..0x7e] => (DcsPassthrough, _)
    0x7f         => (_, _)
}

DcsIgnore {
    [0x00..0x17] => (_, _)
    0x19         => (_, _)
    [0x1c..0x1f] => (_, _)
    [0x20..0x7f] => (_, _)
    0x9c         => (Ground, _)
}

DcsParam {
    [0x00..0x17] => (_, _)
    0x19         => (_, _)
    [0x1c..0x1f] => (_, _)

    [0x20..0x2f] => (DcsIntermediate, Collect)
    [0x30..0x39] => (_, Param)
    0x3a         => (DcsIgnore, _)
    0x3b         => (_, Param)
    [0x3c..0x3f] => (DcsIgnore, _)
    [0x40..0x7e] => (DcsPassthrough, _)
    0x7f         => (_, _)
}

DcsPassthrough {
    @entry Hook

    [0x00..0x17] => (_, Put)
    0x19         => (_, Put)
    [0x1c..0x1f] => (_, Put)
    [0x20..0x7e] => (_, Put)
    0x7f         => (_, _)
    0x9c         => (Ground, _)

    @exit Unhook
}

SosPmApcString {
    [0x00..0x17] => (_, _)
    0x19         => (_, _)
    [0x1c..0x1f] => (_, _)
    [0x20..0x7f] => (_, _)
    0x9c         => (Ground, _)
}

OscString {
    @entry OscStart

    [0x00..0x06] => (_, _)

    // While the standard says that only ST can terminate the string,
    // xterm uses BEL (0x07)
    0x07         => (Ground, _)

    [0x08..0x17] => (_, _)
    0x19         => (_, _)
    [0x1c..0x1f] => (_, _)

    [0x20..0xff] => (_, OscPut)
    @exit OscEnd
}