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//
// A labeled switch in zig allows the usage of continue and break
// just like loops, these allow you to create very concise
// Finite State Automata to represent state transitions
//
// foo: switch (state) {
// 1 => continue :foo 2,
// 2 => continue :foo 3,
// 3 => break :foo,
// 4 => {},
// ...
// }
//
const std = @import("std");
const PullRequestState = enum(u8) {
Draft,
InReview,
Approved,
Rejected,
Merged,
};
pub fn main() void {
// Oh no, your pull request keeps being rejected,
// how would you fix it?
pr: switch (@as(PullRequestState, PullRequestState.Draft)) {
PullRequestState.Draft => continue :pr PullRequestState.InReview,
PullRequestState.InReview => continue :pr PullRequestState.Rejected,
PullRequestState.Approved => continue :pr PullRequestState.Merged,
PullRequestState.Rejected => {
std.debug.print("The pull request has been rejected", .{});
return;
},
PullRequestState.Merged => break, // Would you know where to break to?
}
std.debug.print("The pull request has been merged", .{});
}
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