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const std = @import("std");
pub const Character = union(enum) {
const Self = @This();
pub const EPSILON: u8 = '_';
pub const END: u8 = 0;
epsilon: void,
terminal: u8,
non_terminal: u8,
pub fn from_u8(c: u8) Self {
if (c == '_') {
return Self { .epsilon = void{} };
} else if (std.ascii.isUpper(c)) {
return Self { .non_terminal = c };
} else {
return Self { .terminal = c };
}
}
pub fn format(
self: *const Self,
comptime fmt: []const u8,
options: std.fmt.FormatOptions,
writer: anytype,
) !void {
_ = fmt;
_ = options;
switch (self.*) {
.epsilon => _ = try writer.writeAll("ε"),
.terminal => |c| try writer.writeByte(c),
.non_terminal => |c| try writer.writeByte(c),
}
}
};
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