const std = @import("std"); const Allocator = std.mem.Allocator; // NOTE: right now, only numbers. pub const ValueType = enum(u8) { Bool, Nil, Number, }; pub const ValueValue = union(ValueType) { Bool: bool, Nil: void, Number: f64, }; pub const Value = struct { vtype: ValueType, as: ValueValue, }; // helper functions pub fn BoolVal(val: bool) Value { return Value{ .vtype = .Bool, .as = ValueValue{ .Bool = val } }; } pub fn NilVal() Value { return Value{ .vtype = .Nil, .as = ValueValue{ .Nil = {} } }; } pub fn NumberVal(val: f64) Value { return Value{ .vtype = .Number, .as = ValueValue{ .Number = val } }; } pub fn printValue(stdout: var, value: Value) !void { switch (value.as) { .Nil => try stdout.print("nil"), .Bool => try stdout.print("{}", value.as.Bool), .Number => try stdout.print("{}", value.as.Number), else => unreachable, } } pub const ValueList = struct { count: usize, values: []Value, allocator: *Allocator, pub fn init(allocator: *Allocator) !ValueList { return ValueList{ .count = 0, .allocator = allocator, .values = try allocator.alloc(Value, 0), }; } pub fn write(self: *ValueList, value: Value) !void { if (self.values.len < self.count + 1) { self.values = try self.allocator.realloc( self.values, self.count + 1, ); } self.values[self.count] = value; self.count += 1; } };