// token.bux — Token kinds and helpers
module Token {

// ---------------------------------------------------------------------------
// TokenKind enum
// ---------------------------------------------------------------------------

// Literals
const tkIntLiteral: int = 0;
const tkFloatLiteral: int = 1;
const tkStringLiteral: int = 2;
const tkCharLiteral: int = 3;
const tkBoolLiteral: int = 4;

// Identifiers
const tkIdent: int = 5;
const tkUnderscore: int = 6;

// Control flow keywords
const tkIf: int = 7;
const tkElse: int = 8;
const tkWhile: int = 9;
const tkDo: int = 10;
const tkLoop: int = 11;
const tkFor: int = 12;
const tkIn: int = 13;
const tkBreak: int = 14;
const tkContinue: int = 15;
const tkReturn: int = 16;
const tkMatch: int = 17;

// Declaration keywords
const tkFunc: int = 18;
const tkLet: int = 19;
const tkVar: int = 20;
const tkConst: int = 21;
const tkType: int = 22;
const tkStruct: int = 23;
const tkEnum: int = 24;
const tkUnion: int = 25;
const tkInterface: int = 26;
const tkExtend: int = 27;
const tkModule: int = 28;
const tkImport: int = 29;
const tkPub: int = 30;
const tkExtern: int = 31;

// Other keywords
const tkAs: int = 32;
const tkIs: int = 33;
const tkNull: int = 34;
const tkSelf: int = 35;
const tkSuper: int = 36;
const tkSizeOf: int = 37;

// Punctuation
const tkLParen: int = 38;
const tkRParen: int = 39;
const tkLBrace: int = 40;
const tkRBrace: int = 41;
const tkLBracket: int = 42;
const tkRBracket: int = 43;
const tkComma: int = 44;
const tkSemicolon: int = 45;
const tkColon: int = 46;
const tkColonColon: int = 47;
const tkDot: int = 48;
const tkDotDot: int = 49;
const tkDotDotDot: int = 50;
const tkDotDotEqual: int = 51;
const tkArrow: int = 52;
const tkFatArrow: int = 53;
const tkAt: int = 54;
const tkHash: int = 55;
const tkQuestion: int = 56;

// Arithmetic operators
const tkPlus: int = 57;
const tkMinus: int = 58;
const tkStar: int = 59;
const tkSlash: int = 60;
const tkPercent: int = 61;
const tkStarStar: int = 62;
const tkPlusPlus: int = 63;
const tkMinusMinus: int = 64;

// Bitwise operators
const tkAmp: int = 65;
const tkPipe: int = 66;
const tkCaret: int = 67;
const tkTilde: int = 68;
const tkShl: int = 69;
const tkShr: int = 70;

// Logical operators
const tkAmpAmp: int = 71;
const tkPipePipe: int = 72;
const tkBang: int = 73;

// Comparison operators
const tkEq: int = 74;
const tkNe: int = 75;
const tkLt: int = 76;
const tkLe: int = 77;
const tkGt: int = 78;
const tkGe: int = 79;

// Assignment operators
const tkAssign: int = 80;
const tkPlusAssign: int = 81;
const tkMinusAssign: int = 82;
const tkStarAssign: int = 83;
const tkSlashAssign: int = 84;
const tkPercentAssign: int = 85;
const tkAmpAssign: int = 86;
const tkPipeAssign: int = 87;
const tkCaretAssign: int = 88;
const tkShlAssign: int = 89;
const tkShrAssign: int = 90;

// Compile-time intrinsics
const tkHashLine: int = 91;
const tkHashColumn: int = 92;
const tkHashFile: int = 93;
const tkHashFunction: int = 94;
const tkHashDate: int = 95;
const tkHashTime: int = 96;
const tkHashModule: int = 97;

// Special
const tkOwn: int = 98;
const tkNewLine: int = 99;
const tkEndOfFile: int = 100;
const tkUnknown: int = 101;

// Async / concurrency
const tkAsync: int = 102;
const tkAwait: int = 103;
const tkSpawn: int = 104;
const tkDiscard: int = 105;
const tkDefer: int = 106;
const tkSwitch: int = 107;
const tkCase: int = 108;
const tkDefault: int = 109;

// ---------------------------------------------------------------------------
// Token struct
// ---------------------------------------------------------------------------

struct Token {
    kind: int;
    text: String;
    line: uint32;
    column: uint32;
    offset: uint32;
}

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

func Token_IsKeyword(kind: int) -> bool {
    if kind >= tkIf && kind <= tkIn { return true; }
    if kind >= tkBreak && kind <= tkMatch { return true; }
    if kind >= tkFunc && kind <= tkExtern { return true; }
    if kind >= tkAs && kind <= tkSuper { return true; }
    if kind == tkSizeOf { return true; }
    if kind >= tkAsync && kind <= tkSpawn { return true; }
    return false;
}

func Token_IsLiteral(kind: int) -> bool {
    if kind >= tkIntLiteral && kind <= tkBoolLiteral { return true; }
    return false;
}

func Token_IsOperator(kind: int) -> bool {
    if kind >= tkPlus && kind <= tkShrAssign { return true; }
    return false;
}

func Token_IsEof(kind: int) -> bool {
    return kind == tkEndOfFile;
}

func Token_KeywordKind(text: String) -> int {
    if String_Eq(text, "func") { return tkFunc; }
    if String_Eq(text, "let") { return tkLet; }
    if String_Eq(text, "var") { return tkVar; }
    if String_Eq(text, "const") { return tkConst; }
    if String_Eq(text, "type") { return tkType; }
    if String_Eq(text, "struct") { return tkStruct; }
    if String_Eq(text, "enum") { return tkEnum; }
    if String_Eq(text, "union") { return tkUnion; }
    if String_Eq(text, "interface") { return tkInterface; }
    if String_Eq(text, "extend") { return tkExtend; }
    if String_Eq(text, "module") { return tkModule; }
    if String_Eq(text, "import") { return tkImport; }
    if String_Eq(text, "pub") { return tkPub; }
    if String_Eq(text, "extern") { return tkExtern; }
    if String_Eq(text, "if") { return tkIf; }
    if String_Eq(text, "else") { return tkElse; }
    if String_Eq(text, "while") { return tkWhile; }
    if String_Eq(text, "do") { return tkDo; }
    if String_Eq(text, "loop") { return tkLoop; }
    if String_Eq(text, "for") { return tkFor; }
    if String_Eq(text, "in") { return tkIn; }
    if String_Eq(text, "break") { return tkBreak; }
    if String_Eq(text, "continue") { return tkContinue; }
    if String_Eq(text, "return") { return tkReturn; }
    if String_Eq(text, "match") { return tkMatch; }
    if String_Eq(text, "as") { return tkAs; }
    if String_Eq(text, "is") { return tkIs; }
    if String_Eq(text, "null") { return tkNull; }
    if String_Eq(text, "self") { return tkSelf; }
    if String_Eq(text, "super") { return tkSuper; }
    if String_Eq(text, "sizeof") { return tkSizeOf; }
    if String_Eq(text, "true") { return tkBoolLiteral; }
    if String_Eq(text, "false") { return tkBoolLiteral; }
    return tkIdent;
}

func Token_KindName(kind: int) -> String {
    if kind == tkIntLiteral { return "integer literal"; }
    if kind == tkFloatLiteral { return "float literal"; }
    if kind == tkStringLiteral { return "string literal"; }
    if kind == tkCharLiteral { return "char literal"; }
    if kind == tkBoolLiteral { return "boolean literal"; }
    if kind == tkIdent { return "identifier"; }
    if kind == tkUnderscore { return "_"; }
    if kind == tkSizeOf { return "sizeof"; }
    if kind == tkIf { return "if"; }
    if kind == tkElse { return "else"; }
    if kind == tkWhile { return "while"; }
    if kind == tkDo { return "do"; }
    if kind == tkLoop { return "loop"; }
    if kind == tkFor { return "for"; }
    if kind == tkIn { return "in"; }
    if kind == tkBreak { return "break"; }
    if kind == tkContinue { return "continue"; }
    if kind == tkReturn { return "return"; }
    if kind == tkMatch { return "match"; }
    if kind == tkFunc { return "func"; }
    if kind == tkLet { return "let"; }
    if kind == tkVar { return "var"; }
    if kind == tkConst { return "const"; }
    if kind == tkType { return "type"; }
    if kind == tkStruct { return "struct"; }
    if kind == tkEnum { return "enum"; }
    if kind == tkUnion { return "union"; }
    if kind == tkInterface { return "interface"; }
    if kind == tkExtend { return "extend"; }
    if kind == tkModule { return "module"; }
    if kind == tkImport { return "import"; }
    if kind == tkPub { return "pub"; }
    if kind == tkExtern { return "extern"; }
    if kind == tkAs { return "as"; }
    if kind == tkIs { return "is"; }
    if kind == tkNull { return "null"; }
    if kind == tkSelf { return "self"; }
    if kind == tkSuper { return "super"; }
    if kind == tkLParen { return "("; }
    if kind == tkRParen { return ")"; }
    if kind == tkLBrace { return "{"; }
    if kind == tkRBrace { return "}"; }
    if kind == tkLBracket { return "["; }
    if kind == tkRBracket { return "]"; }
    if kind == tkComma { return ","; }
    if kind == tkSemicolon { return ";"; }
    if kind == tkColon { return ":"; }
    if kind == tkColonColon { return "::"; }
    if kind == tkDot { return "."; }
    if kind == tkDotDot { return ".."; }
    if kind == tkDotDotDot { return "..."; }
    if kind == tkDotDotEqual { return "..="; }
    if kind == tkArrow { return "->"; }
    if kind == tkFatArrow { return "=>"; }
    if kind == tkAt { return "@"; }
    if kind == tkHash { return "#"; }
    if kind == tkQuestion { return "?"; }
    if kind == tkPlus { return "+"; }
    if kind == tkMinus { return "-"; }
    if kind == tkStar { return "*"; }
    if kind == tkSlash { return "/"; }
    if kind == tkPercent { return "%"; }
    if kind == tkStarStar { return "**"; }
    if kind == tkPlusPlus { return "++"; }
    if kind == tkMinusMinus { return "--"; }
    if kind == tkAmp { return "&"; }
    if kind == tkPipe { return "|"; }
    if kind == tkCaret { return "^"; }
    if kind == tkTilde { return "~"; }
    if kind == tkShl { return "<<"; }
    if kind == tkShr { return ">>"; }
    if kind == tkAmpAmp { return "&&"; }
    if kind == tkPipePipe { return "||"; }
    if kind == tkBang { return "!"; }
    if kind == tkEq { return "=="; }
    if kind == tkNe { return "!="; }
    if kind == tkLt { return "<"; }
    if kind == tkLe { return "<="; }
    if kind == tkGt { return ">"; }
    if kind == tkGe { return ">="; }
    if kind == tkAssign { return "="; }
    if kind == tkPlusAssign { return "+="; }
    if kind == tkMinusAssign { return "-="; }
    if kind == tkStarAssign { return "*="; }
    if kind == tkSlashAssign { return "/="; }
    if kind == tkPercentAssign { return "%="; }
    if kind == tkAmpAssign { return "&="; }
    if kind == tkPipeAssign { return "|="; }
    if kind == tkCaretAssign { return "^="; }
    if kind == tkShlAssign { return "<<="; }
    if kind == tkShrAssign { return ">>="; }
    if kind == tkHashLine { return "#line"; }
    if kind == tkHashColumn { return "#column"; }
    if kind == tkHashFile { return "#file"; }
    if kind == tkHashFunction { return "#function"; }
    if kind == tkHashDate { return "#date"; }
    if kind == tkHashTime { return "#time"; }
    if kind == tkHashModule { return "#module"; }
    if kind == tkNewLine { return "newline"; }
    if kind == tkEndOfFile { return "end of file"; }
    return "unknown token";
}
}
