extension PureYAML.Parsing.LibYAML {
    /// The parser state, mirroring `yaml_parser_state_e`. Each case names the
    /// production the state machine is in the middle of recognizing.
    enum ParserState: Equatable {
        case streamStart
        case implicitDocumentStart
        case documentStart
        case documentContent
        case documentEnd
        case blockNode
        case blockNodeOrIndentlessSequence
        case flowNode
        case blockSequenceFirstEntry
        case blockSequenceEntry
        case indentlessSequenceEntry
        case blockMappingFirstKey
        case blockMappingKey
        case blockMappingValue
        case flowSequenceFirstEntry
        case flowSequenceEntry
        case flowSequenceEntryMappingKey
        case flowSequenceEntryMappingValue
        case flowSequenceEntryMappingEnd
        case flowMappingFirstKey
        case flowMappingKey
        case flowMappingValue
        case flowMappingEmptyValue
        case end
    }
}