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/// Tokenizer that the tokenizer can be switched to from within the emitter.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum State {
    /// The data state.
    Data,
    /// The plain text state.
    PlainText,
    /// The RC data state.
    RcData,
    /// The raw text state.
    RawText,
    /// The script data state.
    ScriptData,
    /// The cdata section state.
    CdataSection,
}

#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub(crate) enum MachineState {
    Data,
    RcData,
    RawText,
    ScriptData,
    PlainText,
    TagOpen,
    EndTagOpen,
    TagName,
    RcDataLessThanSign,
    RcDataEndTagOpen,
    RcDataEndTagName,
    RawTextLessThanSign,
    RawTextEndTagOpen,
    RawTextEndTagName,
    ScriptDataLessThanSign,
    ScriptDataEndTagOpen,
    ScriptDataEndTagName,
    ScriptDataEscapeStart,
    ScriptDataEscapeStartDash,
    ScriptDataEscaped,
    ScriptDataEscapedDash,
    ScriptDataEscapedDashDash,
    ScriptDataEscapedLessThanSign,
    ScriptDataEscapedEndTagOpen,
    ScriptDataEscapedEndTagName,
    ScriptDataDoubleEscapeStart,
    ScriptDataDoubleEscaped,
    ScriptDataDoubleEscapedDash,
    ScriptDataDoubleEscapedDashDash,
    ScriptDataDoubleEscapedLessThanSign,
    ScriptDataDoubleEscapeEnd,
    BeforeAttributeName,
    AttributeName,
    AfterAttributeName,
    BeforeAttributeValue,
    AttributeValueDoubleQuoted,
    AttributeValueSingleQuoted,
    AttributeValueUnquoted,
    AfterAttributeValueQuoted,
    SelfClosingStartTag,
    BogusComment,
    MarkupDeclarationOpen,
    CommentStart,
    CommentStartDash,
    Comment,
    CommentLessThanSign,
    CommentLessThanSignBang,
    CommentLessThanSignBangDash,
    CommentLessThanSignBangDashDash,
    CommentEndDash,
    CommentEnd,
    CommentEndBang,
    Doctype,
    BeforeDoctypeName,
    DoctypeName,
    AfterDoctypeName,
    AfterDoctypePublicKeyword,
    BeforeDoctypePublicIdentifier,
    DoctypePublicIdentifierDoubleQuoted,
    DoctypePublicIdentifierSingleQuoted,
    AfterDoctypePublicIdentifier,
    BetweenDoctypePublicAndSystemIdentifiers,
    AfterDoctypeSystemKeyword,
    BeforeDoctypeSystemIdentifier,
    DoctypeSystemIdentifierDoubleQuoted,
    DoctypeSystemIdentifierSingleQuoted,
    AfterDoctypeSystemIdentifier,
    BogusDoctype,
    CdataSection,
    CdataSectionBracket,
    CdataSectionEnd,
    CharacterReference,
    NamedCharacterReference,
    AmbiguousAmpersand,
    NumericCharacterReference,
    HexadecimalCharacterReferenceStart,
    HexadecimalCharacterReference,
    DecimalCharacterReference,
    NumericCharacterReferenceEnd,
}

impl From<State> for MachineState {
    fn from(s: State) -> MachineState {
        // TODO: instead of this conversion, can we rig the enums to be of same layout?
        match s {
            State::Data => MachineState::Data,
            State::PlainText => MachineState::PlainText,
            State::RcData => MachineState::RcData,
            State::RawText => MachineState::RawText,
            State::ScriptData => MachineState::ScriptData,
            State::CdataSection => MachineState::CdataSection,
        }
    }
}