const std = @import("std"); const builtin = @import("builtin"); const Builder = std.build.Builder; const Step = std.build.Step; const assert = std.debug.assert; const print = std.debug.print; // When changing this version, be sure to also update README.md in two places: // 1) Getting Started // 2) Version Changes const needed_version = std.SemanticVersion.parse("0.10.0-dev.3952") catch unreachable; const Exercise = struct { /// main_file must have the format key_name.zig. /// The key will be used as a shorthand to build /// just one example. main_file: []const u8, /// This is the desired output of the program. /// A program passes if its output ends with this string. output: []const u8, /// This is an optional hint to give if the program does not succeed. hint: []const u8 = "", /// By default, we verify output against stderr. /// Set this to true to check stdout instead. check_stdout: bool = false, /// This exercise makes use of the async feature. /// We need to keep track of this, so we compile without the self hosted compiler @"async": bool = false, /// Returns the name of the main file with .zig stripped. pub fn baseName(self: Exercise) []const u8 { assert(std.mem.endsWith(u8, self.main_file, ".zig")); return self.main_file[0 .. self.main_file.len - 4]; } /// Returns the key of the main file, the string before the '_' with /// "zero padding" removed. /// For example, "001_hello.zig" has the key "1". pub fn key(self: Exercise) []const u8 { const end_index = std.mem.indexOfScalar(u8, self.main_file, '_'); assert(end_index != null); // main file must be key_description.zig // remove zero padding by advancing index past '0's var start_index: usize = 0; while (self.main_file[start_index] == '0') start_index += 1; return self.main_file[start_index..end_index.?]; } }; const exercises = [_]Exercise{ .{ .main_file = "001_hello.zig", .output = "Hello world", .hint = "DON'T PANIC!\nRead the error above.\nSee how it has something to do with 'main'?\nOpen up the source file as noted and read the comments.\nYou can do this!", }, .{ .main_file = "002_std.zig", .output = "Standard Library", }, .{ .main_file = "003_assignment.zig", .output = "55 314159 -11", .hint = "There are three mistakes in this one!", }, .{ .main_file = "004_arrays.zig", .output = "First: 2, Fourth: 7, Length: 8", .hint = "There are two things to complete here.", }, .{ .main_file = "005_arrays2.zig", .output = "LEET: 1337, Bits: 100110011001", .hint = "Fill in the two arrays.", }, .{ .main_file = "006_strings.zig", .output = "d=d ha ha ha Major Tom", .hint = "Each '???' needs something filled in.", }, .{ .main_file = "007_strings2.zig", .output = "Ziggy played guitar\nJamming good with Andrew Kelley\nAnd the Spiders from Mars", .hint = "Please fix the lyrics!", }, .{ .main_file = "008_quiz.zig", .output = "Program in Zig!", .hint = "See if you can fix the program!", }, .{ .main_file = "009_if.zig", .output = "Foo is 1!", }, .{ .main_file = "010_if2.zig", .output = "With the discount, the price is $17.", }, .{ .main_file = "011_while.zig", .output = "2 4 8 16 32 64 128 256 512 n=1024", .hint = "You probably want a 'less than' condition.", }, .{ .main_file = "012_while2.zig", .output = "2 4 8 16 32 64 128 256 512 n=1024", .hint = "It might help to look back at the previous exercise.", }, .{ .main_file = "013_while3.zig", .output = "1 2 4 7 8 11 13 14 16 17 19", }, .{ .main_file = "014_while4.zig", .output = "n=4", }, .{ .main_file = "015_for.zig", .output = "A Dramatic Story: :-) :-) :-( :-| :-) The End.", }, .{ .main_file = "016_for2.zig", .output = "13", }, .{ .main_file = "017_quiz2.zig", .output = "1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, Buzz, 11, Fizz, 13, 14, FizzBuzz, 16,", .hint = "This is a famous game!", }, .{ .main_file = "018_functions.zig", .output = "Answer to the Ultimate Question: 42", .hint = "Can you help write the function?", }, .{ .main_file = "019_functions2.zig", .output = "2 4 8 16", }, .{ .main_file = "020_quiz3.zig", .output = "32 64 128 256", .hint = "Unexpected pop quiz! Help!", }, .{ .main_file = "021_errors.zig", .output = "2<4. 3<4. 4=4. 5>4. 6>4.", .hint = "What's the deal with fours?", }, .{ .main_file = "022_errors2.zig", .output = "I compiled", .hint = "Get the error union type right to allow this to compile.", }, .{ .main_file = "023_errors3.zig", .output = "a=64, b=22", }, .{ .main_file = "024_errors4.zig", .output = "a=20, b=14, c=10", }, .{ .main_file = "025_errors5.zig", .output = "a=0, b=19, c=0", }, .{ .main_file = "026_hello2.zig", .output = "Hello world!", .hint = "Try using a try!", .check_stdout = true, }, .{ .main_file = "027_defer.zig", .output = "One Two", }, .{ .main_file = "028_defer2.zig", .output = "(Goat) (Cat) (Dog) (Dog) (Goat) (Unknown) done.", }, .{ .main_file = "029_errdefer.zig", .output = "Getting number...got 5. Getting number...failed!", }, .{ .main_file = "030_switch.zig", .output = "ZIG?", }, .{ .main_file = "031_switch2.zig", .output = "ZIG!", }, .{ .main_file = "032_unreachable.zig", .output = "1 2 3 9 8 7", }, .{ .main_file = "033_iferror.zig", .output = "2<4. 3<4. 4=4. 5>4. 6>4.", .hint = "Seriously, what's the deal with fours?", }, .{ .main_file = "034_quiz4.zig", .output = "my_num=42", .hint = "Can you make this work?", .check_stdout = true, }, .{ .main_file = "035_enums.zig", .output = "1 2 3 9 8 7", .hint = "This problem seems familiar...", }, .{ .main_file = "036_enums2.zig", .output = "

\n Red\n Green\n Blue\n

", .hint = "I'm feeling blue about this.", }, .{ .main_file = "037_structs.zig", .output = "Your wizard has 90 health and 25 gold.", }, .{ .main_file = "038_structs2.zig", .output = "Character 1 - G:20 H:100 XP:10\nCharacter 2 - G:10 H:100 XP:20", }, .{ .main_file = "039_pointers.zig", .output = "num1: 5, num2: 5", .hint = "Pointers aren't so bad.", }, .{ .main_file = "040_pointers2.zig", .output = "a: 12, b: 12", }, .{ .main_file = "041_pointers3.zig", .output = "foo=6, bar=11", }, .{ .main_file = "042_pointers4.zig", .output = "num: 5, more_nums: 1 1 5 1", }, .{ .main_file = "043_pointers5.zig", .output = "Wizard (G:10 H:100 XP:20)\n Mentor: Wizard (G:10000 H:100 XP:2340)", }, .{ .main_file = "044_quiz5.zig", .output = "Elephant A. Elephant B. Elephant C.", .hint = "Oh no! We forgot Elephant B!", }, .{ .main_file = "045_optionals.zig", .output = "The Ultimate Answer: 42.", }, .{ .main_file = "046_optionals2.zig", .output = "Elephant A. Elephant B. Elephant C.", .hint = "Elephants again!", }, .{ .main_file = "047_methods.zig", .output = "5 aliens. 4 aliens. 1 aliens. 0 aliens. Earth is saved!", .hint = "Use the heat ray. And the method!", }, .{ .main_file = "048_methods2.zig", .output = "A B C", .hint = "This just needs one little fix.", }, .{ .main_file = "049_quiz6.zig", .output = "A B C Cv Bv Av", .hint = "Now you're writing Zig!", }, .{ .main_file = "050_no_value.zig", .output = "That is not dead which can eternal lie / And with strange aeons even death may die.", }, .{ .main_file = "051_values.zig", .output = "1:false!. 2:true!. 3:true!. XP before:0, after:200.", }, .{ .main_file = "052_slices.zig", .output = "Hand1: A 4 K 8 \nHand2: 5 2 Q J", }, .{ .main_file = "053_slices2.zig", .output = "'all your base are belong to us.' 'for great justice.'", }, .{ .main_file = "054_manypointers.zig", .output = "Memory is a resource.", }, .{ .main_file = "055_unions.zig", .output = "Insect report! Ant alive is: true. Bee visited 15 flowers.", }, .{ .main_file = "056_unions2.zig", .output = "Insect report! Ant alive is: true. Bee visited 16 flowers.", }, .{ .main_file = "057_unions3.zig", .output = "Insect report! Ant alive is: true. Bee visited 17 flowers.", }, .{ .main_file = "058_quiz7.zig", .output = "Archer's Point--2->Bridge--1->Dogwood Grove--3->Cottage--2->East Pond--1->Fox Pond", .hint = "This is the biggest program we've seen yet. But you can do it!", }, .{ .main_file = "059_integers.zig", .output = "Zig is cool.", }, .{ .main_file = "060_floats.zig", .output = "Shuttle liftoff weight: 1995796kg", }, .{ .main_file = "061_coercions.zig", .output = "Letter: A", }, .{ .main_file = "062_loop_expressions.zig", .output = "Current language: Zig", .hint = "Surely the current language is 'Zig'!", }, .{ .main_file = "063_labels.zig", .output = "Enjoy your Cheesy Chili!", }, .{ .main_file = "064_builtins.zig", .output = "1101 + 0101 = 0010 (true). Without overflow: 00010010. Furthermore, 11110000 backwards is 00001111.", }, .{ .main_file = "065_builtins2.zig", .output = "A Narcissus loves all Narcissuses. He has room in his heart for: me myself.", }, .{ .main_file = "066_comptime.zig", .output = "Immutable: 12345, 987.654; Mutable: 54321, 456.789; Types: comptime_int, comptime_float, u32, f32", .hint = "It may help to read this one out loud to your favorite stuffed animal until it sinks in completely.", }, .{ .main_file = "067_comptime2.zig", .output = "A BB CCC DDDD", }, .{ .main_file = "068_comptime3.zig", .output = "Minnow (1:32, 4 x 2)\nShark (1:16, 8 x 5)\nWhale (1:1, 143 x 95)\n", }, .{ .main_file = "069_comptime4.zig", .output = "s1={ 1, 2, 3 }, s2={ 1, 2, 3, 4, 5 }, s3={ 1, 2, 3, 4, 5, 6, 7 }", }, .{ .main_file = "070_comptime5.zig", .output = "\"Quack.\" ducky1: true, \"Squeek!\" ducky2: true, ducky3: false", .hint = "Have you kept the wizard hat on?", }, .{ .main_file = "071_comptime6.zig", .output = "Narcissus has room in his heart for: me myself.", }, .{ .main_file = "072_comptime7.zig", .output = "26", }, .{ .main_file = "073_comptime8.zig", .output = "My llama value is 25.", }, .{ .main_file = "074_comptime9.zig", .output = "My llama value is 2.", }, .{ .main_file = "075_quiz8.zig", .output = "Archer's Point--2->Bridge--1->Dogwood Grove--3->Cottage--2->East Pond--1->Fox Pond", .hint = "Roll up those sleeves. You get to WRITE some code for this one.", }, .{ .main_file = "076_sentinels.zig", .output = "Array:123056. Many-item pointer:123.", }, .{ .main_file = "077_sentinels2.zig", .output = "Weird Data!", }, .{ .main_file = "078_sentinels3.zig", .output = "Weird Data!", }, .{ .main_file = "079_quoted_identifiers.zig", .output = "Sweet freedom: 55, false.", .hint = "Help us, Zig Programmer, you're our only hope!", }, .{ .main_file = "080_anonymous_structs.zig", .output = "[Circle(i32): 25,70,15] [Circle(f32): 25.2,71.0,15.7]", }, .{ .main_file = "081_anonymous_structs2.zig", .output = "x:205 y:187 radius:12", }, .{ .main_file = "082_anonymous_structs3.zig", .output = "\"0\"(bool):true \"1\"(bool):false \"2\"(i32):42 \"3\"(f32):3.14159202e+00", .hint = "This one is a challenge! But you have everything you need.", }, .{ .main_file = "083_anonymous_lists.zig", .output = "I say hello!", }, .{ .main_file = "084_async.zig", .output = "foo() A", .hint = "Read the facts. Use the facts.", .@"async" = true, }, .{ .main_file = "085_async2.zig", .output = "Hello async!", .@"async" = true, }, .{ .main_file = "086_async3.zig", .output = "5 4 3 2 1", .@"async" = true, }, .{ .main_file = "087_async4.zig", .output = "1 2 3 4 5", .@"async" = true, }, .{ .main_file = "088_async5.zig", .output = "Example Title.", .@"async" = true, }, .{ .main_file = "089_async6.zig", .output = ".com: Example Title, .org: Example Title.", .@"async" = true, }, .{ .main_file = "090_async7.zig", .output = "beef? BEEF!", .@"async" = true, }, .{ .main_file = "091_async8.zig", .output = "ABCDEF", .@"async" = true, }, }; /// Check the zig version to make sure it can compile the examples properly. /// This will compile with Zig 0.6.0 and later. fn checkVersion() bool { if (!@hasDecl(builtin, "zig_version")) { return false; } const version = builtin.zig_version; const order = version.order(needed_version); return order != .lt; } pub fn build(b: *Builder) void { // Use a comptime branch for the version check. // If this fails, code after this block is not compiled. // It is parsed though, so versions of zig from before 0.6.0 // cannot do the version check and will just fail to compile. // We could fix this by moving the ziglings code to a separate file, // but 0.5.0 was a long time ago, it is unlikely that anyone who // attempts these exercises is still using it. if (comptime !checkVersion()) { // very old versions of Zig used warn instead of print. const stderrPrintFn = if (@hasDecl(std.debug, "print")) std.debug.print else std.debug.warn; stderrPrintFn( \\ERROR: Sorry, it looks like your version of zig is too old. :-( \\ \\Ziglings requires development build \\ \\ {} \\ \\or higher. Please download a development ("master") build from \\ \\ https://ziglang.org/download/ \\ \\ , .{needed_version}); std.os.exit(0); } use_color_escapes = false; switch (b.color) { .on => use_color_escapes = true, .off => use_color_escapes = false, .auto => { if (std.io.getStdErr().supportsAnsiEscapeCodes()) { use_color_escapes = true; } else if (builtin.os.tag == .windows) { const w32 = struct { const WINAPI = std.os.windows.WINAPI; const DWORD = std.os.windows.DWORD; const ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x0004; const STD_ERROR_HANDLE = @bitCast(DWORD, @as(i32, -12)); extern "kernel32" fn GetStdHandle(id: DWORD) callconv(WINAPI) ?*anyopaque; extern "kernel32" fn GetConsoleMode(console: ?*anyopaque, out_mode: *DWORD) callconv(WINAPI) u32; extern "kernel32" fn SetConsoleMode(console: ?*anyopaque, mode: DWORD) callconv(WINAPI) u32; }; const handle = w32.GetStdHandle(w32.STD_ERROR_HANDLE); var mode: w32.DWORD = 0; if (w32.GetConsoleMode(handle, &mode) != 0) { mode |= w32.ENABLE_VIRTUAL_TERMINAL_PROCESSING; use_color_escapes = w32.SetConsoleMode(handle, mode) != 0; } } }, } if (use_color_escapes) { red_text = "\x1b[31m"; green_text = "\x1b[32m"; bold_text = "\x1b[1m"; reset_text = "\x1b[0m"; } const header_step = b.addLog( \\ \\ _ _ _ \\ ___(_) __ _| (_)_ __ __ _ ___ \\ |_ | |/ _' | | | '_ \ / _' / __| \\ / /| | (_| | | | | | | (_| \__ \ \\ /___|_|\__, |_|_|_| |_|\__, |___/ \\ |___/ |___/ \\ \\ , .{}); const verify_all = b.step("ziglings", "Check all ziglings"); verify_all.dependOn(&header_step.step); b.default_step = verify_all; var prev_chain_verify = verify_all; const use_healed = b.option(bool, "healed", "Run exercises from patches/healed") orelse false; for (exercises) |ex| { const base_name = ex.baseName(); const file_path = std.fs.path.join(b.allocator, &[_][]const u8{ if (use_healed) "patches/healed" else "exercises", ex.main_file, }) catch unreachable; const build_step = b.addExecutable(base_name, file_path); build_step.install(); const verify_step = ZiglingStep.create(b, ex, use_healed); const key = ex.key(); const named_test = b.step(b.fmt("{s}_test", .{key}), b.fmt("Run {s} without checking output", .{ex.main_file})); const run_step = build_step.run(); named_test.dependOn(&run_step.step); const named_install = b.step(b.fmt("{s}_install", .{key}), b.fmt("Install {s} to zig-cache/bin", .{ex.main_file})); named_install.dependOn(&build_step.install_step.?.step); const named_verify = b.step(key, b.fmt("Check {s} only", .{ex.main_file})); named_verify.dependOn(&verify_step.step); const chain_verify = b.allocator.create(Step) catch unreachable; chain_verify.* = Step.initNoOp(.custom, b.fmt("chain {s}", .{key}), b.allocator); chain_verify.dependOn(&verify_step.step); const named_chain = b.step(b.fmt("{s}_start", .{key}), b.fmt("Check all solutions starting at {s}", .{ex.main_file})); named_chain.dependOn(&header_step.step); named_chain.dependOn(chain_verify); prev_chain_verify.dependOn(chain_verify); prev_chain_verify = chain_verify; } } var use_color_escapes = false; var red_text: []const u8 = ""; var green_text: []const u8 = ""; var bold_text: []const u8 = ""; var reset_text: []const u8 = ""; const ZiglingStep = struct { step: Step, exercise: Exercise, builder: *Builder, use_healed: bool, pub fn create(builder: *Builder, exercise: Exercise, use_healed: bool) *@This() { const self = builder.allocator.create(@This()) catch unreachable; self.* = .{ .step = Step.init(.custom, exercise.main_file, builder.allocator, make), .exercise = exercise, .builder = builder, .use_healed = use_healed, }; return self; } fn make(step: *Step) anyerror!void { const self = @fieldParentPtr(@This(), "step", step); self.makeInternal() catch { if (self.exercise.hint.len > 0) { print("\n{s}HINT: {s}{s}", .{ bold_text, self.exercise.hint, reset_text }); } print("\n{s}Edit exercises/{s} and run this again.{s}", .{ red_text, self.exercise.main_file, reset_text }); print("\n{s}To continue from this zigling, use this command:{s}\n {s}zig build {s}{s}\n", .{ red_text, reset_text, bold_text, self.exercise.key(), reset_text }); std.os.exit(0); }; } fn makeInternal(self: *@This()) !void { print("Compiling {s}...\n", .{self.exercise.main_file}); const exe_file = try self.doCompile(); print("Checking {s}...\n", .{self.exercise.main_file}); const cwd = self.builder.build_root; const argv = [_][]const u8{exe_file}; var child = std.ChildProcess.init(&argv, self.builder.allocator); child.cwd = cwd; child.env_map = self.builder.env_map; child.stdin_behavior = .Inherit; if (self.exercise.check_stdout) { child.stdout_behavior = .Pipe; child.stderr_behavior = .Inherit; } else { child.stdout_behavior = .Inherit; child.stderr_behavior = .Pipe; } child.spawn() catch |err| { print("{s}Unable to spawn {s}: {s}{s}\n", .{ red_text, argv[0], @errorName(err), reset_text }); return err; }; // Allow up to 1 MB of stdout capture const max_output_len = 1 * 1024 * 1024; const output = if (self.exercise.check_stdout) try child.stdout.?.reader().readAllAlloc(self.builder.allocator, max_output_len) else try child.stderr.?.reader().readAllAlloc(self.builder.allocator, max_output_len); // at this point stdout is closed, wait for the process to terminate const term = child.wait() catch |err| { print("{s}Unable to spawn {s}: {s}{s}\n", .{ red_text, argv[0], @errorName(err), reset_text }); return err; }; // make sure it exited cleanly. switch (term) { .Exited => |code| { if (code != 0) { print("{s}{s} exited with error code {d} (expected {d}){s}\n", .{ red_text, self.exercise.main_file, code, 0, reset_text }); return error.BadExitCode; } }, else => { print("{s}{s} terminated unexpectedly{s}\n", .{ red_text, self.exercise.main_file, reset_text }); return error.UnexpectedTermination; }, } // validate the output if (std.mem.indexOf(u8, output, self.exercise.output) == null) { print( \\ \\{s}----------- Expected this output -----------{s} \\{s} \\{s}----------- but found -----------{s} \\{s} \\{s}-----------{s} \\ , .{ red_text, reset_text, self.exercise.output, red_text, reset_text, output, red_text, reset_text }); return error.InvalidOutput; } print("{s}PASSED:\n{s}{s}\n", .{ green_text, output, reset_text }); } // The normal compile step calls os.exit, so we can't use it as a library :( // This is a stripped down copy of std.build.LibExeObjStep.make. fn doCompile(self: *@This()) ![]const u8 { const builder = self.builder; var zig_args = std.ArrayList([]const u8).init(builder.allocator); defer zig_args.deinit(); zig_args.append(builder.zig_exe) catch unreachable; zig_args.append("build-exe") catch unreachable; // Enable the stage 1 compiler if using the async feature if (self.exercise.@"async") { zig_args.append("-fstage1") catch unreachable; } if (builder.color != .auto) { zig_args.append("--color") catch unreachable; zig_args.append(@tagName(builder.color)) catch unreachable; } const zig_file = std.fs.path.join(builder.allocator, &[_][]const u8{ if (self.use_healed) "patches/healed" else "exercises", self.exercise.main_file }) catch unreachable; zig_args.append(builder.pathFromRoot(zig_file)) catch unreachable; zig_args.append("--cache-dir") catch unreachable; zig_args.append(builder.pathFromRoot(builder.cache_root)) catch unreachable; zig_args.append("--enable-cache") catch unreachable; const argv = zig_args.items; var code: u8 = undefined; const output_dir_nl = builder.execAllowFail(argv, &code, .Inherit) catch |err| { switch (err) { error.FileNotFound => { print("{s}{s}: Unable to spawn the following command: file not found{s}\n", .{ red_text, self.exercise.main_file, reset_text }); for (argv) |v| print("{s} ", .{v}); print("\n", .{}); }, error.ExitCodeFailure => { print("{s}{s}: The following command exited with error code {}:{s}\n", .{ red_text, self.exercise.main_file, code, reset_text }); for (argv) |v| print("{s} ", .{v}); print("\n", .{}); }, error.ProcessTerminated => { print("{s}{s}: The following command terminated unexpectedly:{s}\n", .{ red_text, self.exercise.main_file, reset_text }); for (argv) |v| print("{s} ", .{v}); print("\n", .{}); }, else => {}, } return err; }; const build_output_dir = std.mem.trimRight(u8, output_dir_nl, "\r\n"); const target_info = std.zig.system.NativeTargetInfo.detect( .{}, ) catch unreachable; const target = target_info.target; const file_name = std.zig.binNameAlloc(builder.allocator, .{ .root_name = self.exercise.baseName(), .target = target, .output_mode = .Exe, .link_mode = .Static, .version = null, }) catch unreachable; return std.fs.path.join(builder.allocator, &[_][]const u8{ build_output_dir, file_name, }); } };