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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(u16)]
#[allow(non_camel_case_types)]
pub enum SyntaxKind {
    // Internals
    TOKEN_COMMENT,
    TOKEN_ERROR,
    TOKEN_WHITESPACE,

    // Keywords
    TOKEN_ASSERT,
    TOKEN_ELSE,
    TOKEN_IF,
    TOKEN_IN,
    TOKEN_INHERIT,
    TOKEN_LET,
    TOKEN_OR,
    TOKEN_REC,
    TOKEN_THEN,
    TOKEN_WITH,

    // Symbols
    TOKEN_L_BRACE,
    TOKEN_R_BRACE,
    TOKEN_L_BRACK,
    TOKEN_R_BRACK,
    TOKEN_ASSIGN,
    TOKEN_AT,
    TOKEN_COLON,
    TOKEN_COMMA,
    TOKEN_DOT,
    TOKEN_ELLIPSIS,
    TOKEN_QUESTION,
    TOKEN_SEMICOLON,

    // Operators
    TOKEN_L_PAREN,
    TOKEN_R_PAREN,
    TOKEN_CONCAT,
    TOKEN_INVERT,
    TOKEN_UPDATE,

    TOKEN_ADD,
    TOKEN_SUB,
    TOKEN_MUL,
    TOKEN_DIV,

    TOKEN_AND_AND,
    TOKEN_EQUAL,
    TOKEN_IMPLICATION,
    TOKEN_LESS,
    TOKEN_LESS_OR_EQ,
    TOKEN_MORE,
    TOKEN_MORE_OR_EQ,
    TOKEN_NOT_EQUAL,
    TOKEN_OR_OR,

    // Identifiers and values
    TOKEN_FLOAT,
    TOKEN_IDENT,
    TOKEN_INTEGER,
    TOKEN_INTERPOL_END,
    TOKEN_INTERPOL_START,
    TOKEN_PATH,
    TOKEN_URI,
    TOKEN_STRING_CONTENT,
    TOKEN_STRING_END,
    TOKEN_STRING_START,

    NODE_APPLY,
    NODE_ASSERT,
    NODE_ATTRPATH,
    NODE_DYNAMIC,
    NODE_ERROR,
    NODE_IDENT,
    NODE_IF_ELSE,
    NODE_SELECT,
    NODE_INHERIT,
    NODE_INHERIT_FROM,
    NODE_STRING,
    NODE_INTERPOL,
    NODE_LAMBDA,
    NODE_IDENT_PARAM,
    // An old let { x = 92; body = x; } syntax
    NODE_LEGACY_LET,
    NODE_LET_IN,
    NODE_LIST,
    NODE_BIN_OP,
    NODE_PAREN,
    NODE_PATTERN,
    NODE_PAT_BIND,
    NODE_PAT_ENTRY,
    NODE_ROOT,
    NODE_ATTR_SET,
    NODE_ATTRPATH_VALUE,
    NODE_UNARY_OP,
    NODE_LITERAL,
    NODE_WITH,
    NODE_PATH,
    // Attrpath existence check: foo ? bar.${baz}."bux"
    NODE_HAS_ATTR,

    #[doc(hidden)]
    __LAST,
}
use SyntaxKind::*;

impl SyntaxKind {
    /// Returns true if this token is a literal, such as an integer or a string
    pub fn is_literal(self) -> bool {
        matches!(self, TOKEN_FLOAT | TOKEN_INTEGER | TOKEN_PATH | TOKEN_URI)
    }

    /// Returns true if this token should be used as a function argument.
    /// ```ignore
    /// Example:
    /// add 1 2 + 3
    /// ^   ^ ^ ^
    /// |   | | +- false
    /// |   | +- true
    /// |   +- true
    /// +- true
    /// ```
    pub fn is_fn_arg(self) -> bool {
        match self {
            TOKEN_REC | TOKEN_L_BRACE | TOKEN_L_BRACK | TOKEN_L_PAREN | TOKEN_STRING_START
            | TOKEN_IDENT => true,
            _ => self.is_literal(),
        }
    }
    /// Returns true if this token is a comment, whitespace, or similar, and
    /// should be skipped over by the parser.
    pub fn is_trivia(self) -> bool {
        matches!(self, TOKEN_COMMENT | TOKEN_ERROR | TOKEN_WHITESPACE)
    }
}