namespace StellaOps.PolicyDsl;

/// <summary>
/// Represents the kind of token in the policy DSL.
/// </summary>
public enum TokenKind
{
    EndOfFile = 0,
    Identifier,
    StringLiteral,
    NumberLiteral,
    BooleanLiteral,
    LeftBrace,
    RightBrace,
    LeftParen,
    RightParen,
    LeftBracket,
    RightBracket,
    Comma,
    Semicolon,
    Colon,
    Arrow,          // =>
    Assign,         // =
    Define,         // :=
    Dot,
    KeywordPolicy,
    KeywordSyntax,
    KeywordMetadata,
    KeywordProfile,
    KeywordRule,
    KeywordMap,
    KeywordSource,
    KeywordEnv,
    KeywordIf,
    KeywordThen,
    KeywordWhen,
    KeywordAnd,
    KeywordOr,
    KeywordNot,
    KeywordPriority,
    KeywordElse,
    KeywordBecause,
    KeywordSettings,
    KeywordIgnore,
    KeywordUntil,
    KeywordEscalate,
    KeywordTo,
    KeywordRequireVex,
    KeywordWarn,
    KeywordMessage,
    KeywordDefer,
    KeywordAnnotate,
    KeywordIn,
    EqualEqual,
    NotEqual,
    LessThan,
    LessThanOrEqual,
    GreaterThan,
    GreaterThanOrEqual,
    Unknown,
}

/// <summary>
/// Represents a single token in the policy DSL.
/// </summary>
public readonly record struct DslToken(
    TokenKind Kind,
    string Text,
    SourceSpan Span,
    object? Value = null);