src/expr.zig

   1 const Token = @import("Token.zig");
   2
   3 pub const Expr = union(enum) {
   4     binary: Binary,
   5     grouping: Grouping,
   6     literal: Literal,
   7     unary: Unary,
   8
   9     const Binary = struct {
  10         left: *const Expr,
  11         operator: Token,
  12         right: *const Expr,
  13
  14         pub fn init(left: *const Expr, operator: Token, right: *const Expr) Binary {
  15             return .{
  16                 .left = left,
  17                 .operator = operator,
  18                 .right = right,
  19             };
  20         }
  21     };
  22
  23     const Grouping = struct {
  24         expression: *const Expr,
  25
  26         pub fn init(expression: *const Expr) Grouping {
  27             return .{
  28                 .expression = expression,
  29             };
  30         }
  31     };
  32
  33     const Literal = struct {
  34         value: Token.Literal,
  35
  36         pub fn init(value: Token.Literal) Literal {
  37             return .{
  38                 .value = value,
  39             };
  40         }
  41     };
  42
  43     const Unary = struct {
  44         operator: Token,
  45         right: *const Expr,
  46
  47         pub fn init(operator: Token, right: *const Expr) Unary {
  48             return Unary{
  49                 .operator = operator,
  50                 .right = right,
  51             };
  52         }
  53     };
  54 };