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| 1 | const std = @import("std.zig"); |
| 2 | const math = std.math; |
| 3 | const assert = std.debug.assert; |
| 4 | const mem = std.mem; |
| 5 | const builtin = @import("builtin"); |
| 6 | const errol = @import("fmt/errol.zig"); |
| 7 | const lossyCast = std.math.lossyCast; |
| 8 | |
| 9 | pub const default_max_depth = 3; |
| 10 | |
| 11 | pub const Alignment = enum { |
| 12 | Left, |
| 13 | Center, |
| 14 | Right, |
| 15 | }; |
| 16 | |
| 17 | pub const FormatOptions = struct { |
| 18 | precision: ?usize = null, |
| 19 | width: ?usize = null, |
| 20 | alignment: ?Alignment = null, |
| 21 | fill: u8 = ' ', |
| 22 | }; |
| 23 | |
| 24 | fn peekIsAlign(comptime fmt: []const u8) bool { |
| 25 | // Should only be called during a state transition to the format segment. |
| 26 | comptime assert(fmt[0] == ':'); |
| 27 | |
| 28 | inline for (([_]u8{ 1, 2 })[0..]) |i| { |
| 29 | if (fmt.len > i and (fmt[i] == '<' or fmt[i] == '^' or fmt[i] == '>')) { |
| 30 | return true; |
| 31 | } |
| 32 | } |
| 33 | return false; |
| 34 | } |
| 35 | |
| 36 | /// Renders fmt string with args, calling output with slices of bytes. |
| 37 | /// If `output` returns an error, the error is returned from `format` and |
| 38 | /// `output` is not called again. |
| 39 | /// |
| 40 | /// The format string must be comptime known and may contain placeholders following |
| 41 | /// this format: |
| 42 | /// `{[position][specifier]:[fill][alignment][width].[precision]}` |
| 43 | /// |
| 44 | /// Each word between `[` and `]` is a parameter you have to replace with something: |
| 45 | /// |
| 46 | /// - *position* is the index of the argument that should be inserted |
| 47 | /// - *specifier* is a type-dependent formatting option that determines how a type should formatted (see below) |
| 48 | /// - *fill* is a single character which is used to pad the formatted text |
| 49 | /// - *alignment* is one of the three characters `<`, `^` or `>`. they define if the text is *left*, *center*, or *right* aligned |
| 50 | /// - *width* is the total width of the field in characters |
| 51 | /// - *precision* specifies how many decimals a formatted number should have |
| 52 | /// |
| 53 | /// Note that most of the parameters are optional and may be omitted. Also you can leave out separators like `:` and `.` when |
| 54 | /// all parameters after the separator are omitted. |
| 55 | /// Only exception is the *fill* parameter. If *fill* is required, one has to specify *alignment* as well, as otherwise |
| 56 | /// the digits after `:` is interpreted as *width*, not *fill*. |
| 57 | /// |
| 58 | /// The *specifier* has several options for types: |
| 59 | /// - `x` and `X`: |
| 60 | /// - format the non-numeric value as a string of bytes in hexadecimal notation ("binary dump") in either lower case or upper case |
| 61 | /// - output numeric value in hexadecimal notation |
| 62 | /// - `s`: print a pointer-to-many as a c-string, use zero-termination |
| 63 | /// - `B` and `Bi`: output a memory size in either metric (1000) or power-of-two (1024) based notation. works for both float and integer values. |
| 64 | /// - `e`: output floating point value in scientific notation |
| 65 | /// - `d`: output numeric value in decimal notation |
| 66 | /// - `b`: output integer value in binary notation |
| 67 | /// - `c`: output integer as an ASCII character. Integer type must have 8 bits at max. |
| 68 | /// - `*`: output the address of the value instead of the value itself. |
| 69 | /// |
| 70 | /// If a formatted user type contains a function of the type |
| 71 | /// ``` |
| 72 | /// fn format(value: ?, comptime fmt: []const u8, options: std.fmt.FormatOptions, context: var, comptime Errors: type, comptime output: fn (@TypeOf(context), []const u8) Errors!void) Errors!void |
| 73 | /// ``` |
| 74 | /// with `?` being the type formatted, this function will be called instead of the default implementation. |
| 75 | /// This allows user types to be formatted in a logical manner instead of dumping all fields of the type. |
| 76 | /// |
| 77 | /// A user type may be a `struct`, `vector`, `union` or `enum` type. |
| 78 | pub fn format( |
| 79 | context: var, |
| 80 | comptime Errors: type, |
| 81 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 82 | comptime fmt: []const u8, |
| 83 | args: var, |
| 84 | ) Errors!void { |
| 85 | const ArgSetType = u32; |
| 86 | if (@typeInfo(@TypeOf(args)) != .Struct) { |
| 87 | @compileError("Expected tuple or struct argument, found " ++ @typeName(@TypeOf(args))); |
| 88 | } |
| 89 | if (args.len > ArgSetType.bit_count) { |
| 90 | @compileError("32 arguments max are supported per format call"); |
| 91 | } |
| 92 | |
| 93 | const State = enum { |
| 94 | Start, |
| 95 | Positional, |
| 96 | CloseBrace, |
| 97 | Specifier, |
| 98 | FormatFillAndAlign, |
| 99 | FormatWidth, |
| 100 | FormatPrecision, |
| 101 | }; |
| 102 | |
| 103 | comptime var start_index = 0; |
| 104 | comptime var state = State.Start; |
| 105 | comptime var maybe_pos_arg: ?comptime_int = null; |
| 106 | comptime var specifier_start = 0; |
| 107 | comptime var specifier_end = 0; |
| 108 | comptime var options = FormatOptions{}; |
| 109 | comptime var arg_state: struct { |
| 110 | next_arg: usize = 0, |
| 111 | used_args: ArgSetType = 0, |
| 112 | args_len: usize = args.len, |
| 113 | |
| 114 | fn hasUnusedArgs(comptime self: *@This()) bool { |
| 115 | return (@popCount(ArgSetType, self.used_args) != self.args_len); |
| 116 | } |
| 117 | |
| 118 | fn nextArg(comptime self: *@This(), comptime pos_arg: ?comptime_int) comptime_int { |
| 119 | const next_idx = pos_arg orelse blk: { |
| 120 | const arg = self.next_arg; |
| 121 | self.next_arg += 1; |
| 122 | break :blk arg; |
| 123 | }; |
| 124 | |
| 125 | if (next_idx >= self.args_len) { |
| 126 | @compileError("Too few arguments"); |
| 127 | } |
| 128 | |
| 129 | // Mark this argument as used |
| 130 | self.used_args |= 1 << next_idx; |
| 131 | |
| 132 | return next_idx; |
| 133 | } |
| 134 | } = .{}; |
| 135 | |
| 136 | inline for (fmt) |c, i| { |
| 137 | switch (state) { |
| 138 | .Start => switch (c) { |
| 139 | '{' => { |
| 140 | if (start_index < i) { |
| 141 | try output(context, fmt[start_index..i]); |
| 142 | } |
| 143 | |
| 144 | start_index = i; |
| 145 | specifier_start = i + 1; |
| 146 | specifier_end = i + 1; |
| 147 | maybe_pos_arg = null; |
| 148 | state = .Positional; |
| 149 | options = FormatOptions{}; |
| 150 | }, |
| 151 | '}' => { |
| 152 | if (start_index < i) { |
| 153 | try output(context, fmt[start_index..i]); |
| 154 | } |
| 155 | state = .CloseBrace; |
| 156 | }, |
| 157 | else => {}, |
| 158 | }, |
| 159 | .Positional => switch (c) { |
| 160 | '{' => { |
| 161 | state = .Start; |
| 162 | start_index = i; |
| 163 | }, |
| 164 | ':' => { |
| 165 | state = if (comptime peekIsAlign(fmt[i..])) State.FormatFillAndAlign else State.FormatWidth; |
| 166 | specifier_end = i; |
| 167 | }, |
| 168 | '0'...'9' => { |
| 169 | if (maybe_pos_arg == null) { |
| 170 | maybe_pos_arg = 0; |
| 171 | } |
| 172 | |
| 173 | maybe_pos_arg.? *= 10; |
| 174 | maybe_pos_arg.? += c - '0'; |
| 175 | specifier_start = i + 1; |
| 176 | |
| 177 | if (maybe_pos_arg.? >= args.len) { |
| 178 | @compileError("Positional value refers to non-existent argument"); |
| 179 | } |
| 180 | }, |
| 181 | '}' => { |
| 182 | const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg); |
| 183 | |
| 184 | try formatType( |
| 185 | args[arg_to_print], |
| 186 | fmt[0..0], |
| 187 | options, |
| 188 | context, |
| 189 | Errors, |
| 190 | output, |
| 191 | default_max_depth, |
| 192 | ); |
| 193 | |
| 194 | state = .Start; |
| 195 | start_index = i + 1; |
| 196 | }, |
| 197 | else => { |
| 198 | state = .Specifier; |
| 199 | specifier_start = i; |
| 200 | }, |
| 201 | }, |
| 202 | .CloseBrace => switch (c) { |
| 203 | '}' => { |
| 204 | state = .Start; |
| 205 | start_index = i; |
| 206 | }, |
| 207 | else => @compileError("Single '}' encountered in format string"), |
| 208 | }, |
| 209 | .Specifier => switch (c) { |
| 210 | ':' => { |
| 211 | specifier_end = i; |
| 212 | state = if (comptime peekIsAlign(fmt[i..])) State.FormatFillAndAlign else State.FormatWidth; |
| 213 | }, |
| 214 | '}' => { |
| 215 | const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg); |
| 216 | |
| 217 | try formatType( |
| 218 | args[arg_to_print], |
| 219 | fmt[specifier_start..i], |
| 220 | options, |
| 221 | context, |
| 222 | Errors, |
| 223 | output, |
| 224 | default_max_depth, |
| 225 | ); |
| 226 | state = .Start; |
| 227 | start_index = i + 1; |
| 228 | }, |
| 229 | else => {}, |
| 230 | }, |
| 231 | // Only entered if the format string contains a fill/align segment. |
| 232 | .FormatFillAndAlign => switch (c) { |
| 233 | '<' => { |
| 234 | options.alignment = Alignment.Left; |
| 235 | state = .FormatWidth; |
| 236 | }, |
| 237 | '^' => { |
| 238 | options.alignment = Alignment.Center; |
| 239 | state = .FormatWidth; |
| 240 | }, |
| 241 | '>' => { |
| 242 | options.alignment = Alignment.Right; |
| 243 | state = .FormatWidth; |
| 244 | }, |
| 245 | else => { |
| 246 | options.fill = c; |
| 247 | }, |
| 248 | }, |
| 249 | .FormatWidth => switch (c) { |
| 250 | '0'...'9' => { |
| 251 | if (options.width == null) { |
| 252 | options.width = 0; |
| 253 | } |
| 254 | |
| 255 | options.width.? *= 10; |
| 256 | options.width.? += c - '0'; |
| 257 | }, |
| 258 | '.' => { |
| 259 | state = .FormatPrecision; |
| 260 | }, |
| 261 | '}' => { |
| 262 | const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg); |
| 263 | |
| 264 | try formatType( |
| 265 | args[arg_to_print], |
| 266 | fmt[specifier_start..specifier_end], |
| 267 | options, |
| 268 | context, |
| 269 | Errors, |
| 270 | output, |
| 271 | default_max_depth, |
| 272 | ); |
| 273 | state = .Start; |
| 274 | start_index = i + 1; |
| 275 | }, |
| 276 | else => { |
| 277 | @compileError("Unexpected character in width value: " ++ [_]u8{c}); |
| 278 | }, |
| 279 | }, |
| 280 | .FormatPrecision => switch (c) { |
| 281 | '0'...'9' => { |
| 282 | if (options.precision == null) { |
| 283 | options.precision = 0; |
| 284 | } |
| 285 | |
| 286 | options.precision.? *= 10; |
| 287 | options.precision.? += c - '0'; |
| 288 | }, |
| 289 | '}' => { |
| 290 | const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg); |
| 291 | |
| 292 | try formatType( |
| 293 | args[arg_to_print], |
| 294 | fmt[specifier_start..specifier_end], |
| 295 | options, |
| 296 | context, |
| 297 | Errors, |
| 298 | output, |
| 299 | default_max_depth, |
| 300 | ); |
| 301 | state = .Start; |
| 302 | start_index = i + 1; |
| 303 | }, |
| 304 | else => { |
| 305 | @compileError("Unexpected character in precision value: " ++ [_]u8{c}); |
| 306 | }, |
| 307 | }, |
| 308 | } |
| 309 | } |
| 310 | comptime { |
| 311 | if (comptime arg_state.hasUnusedArgs()) { |
| 312 | @compileError("Unused arguments"); |
| 313 | } |
| 314 | if (state != State.Start) { |
| 315 | @compileError("Incomplete format string: " ++ fmt); |
| 316 | } |
| 317 | } |
| 318 | if (start_index < fmt.len) { |
| 319 | try output(context, fmt[start_index..]); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | pub fn formatType( |
| 324 | value: var, |
| 325 | comptime fmt: []const u8, |
| 326 | options: FormatOptions, |
| 327 | context: var, |
| 328 | comptime Errors: type, |
| 329 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 330 | max_depth: usize, |
| 331 | ) Errors!void { |
| 332 | if (comptime std.mem.eql(u8, fmt, "*")) { |
| 333 | try output(context, @typeName(@TypeOf(value).Child)); |
| 334 | try output(context, "@"); |
| 335 | try formatInt(@ptrToInt(value), 16, false, FormatOptions{}, context, Errors, output); |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | const T = @TypeOf(value); |
| 340 | switch (@typeInfo(T)) { |
| 341 | .ComptimeInt, .Int, .Float => { |
| 342 | return formatValue(value, fmt, options, context, Errors, output); |
| 343 | }, |
| 344 | .Void => { |
| 345 | return output(context, "void"); |
| 346 | }, |
| 347 | .Bool => { |
| 348 | return output(context, if (value) "true" else "false"); |
| 349 | }, |
| 350 | .Optional => { |
| 351 | if (value) |payload| { |
| 352 | return formatType(payload, fmt, options, context, Errors, output, max_depth); |
| 353 | } else { |
| 354 | return output(context, "null"); |
| 355 | } |
| 356 | }, |
| 357 | .ErrorUnion => { |
| 358 | if (value) |payload| { |
| 359 | return formatType(payload, fmt, options, context, Errors, output, max_depth); |
| 360 | } else |err| { |
| 361 | return formatType(err, fmt, options, context, Errors, output, max_depth); |
| 362 | } |
| 363 | }, |
| 364 | .ErrorSet => { |
| 365 | try output(context, "error."); |
| 366 | return output(context, @errorName(value)); |
| 367 | }, |
| 368 | .Enum => |enumInfo| { |
| 369 | if (comptime std.meta.trait.hasFn("format")(T)) { |
| 370 | return value.format(fmt, options, context, Errors, output); |
| 371 | } |
| 372 | |
| 373 | try output(context, @typeName(T)); |
| 374 | if (enumInfo.is_exhaustive) { |
| 375 | try output(context, "."); |
| 376 | try output(context, @tagName(value)); |
| 377 | } else { |
| 378 | // TODO: when @tagName works on exhaustive enums print known enum strings |
| 379 | try output(context, "("); |
| 380 | try formatType(@enumToInt(value), fmt, options, context, Errors, output, max_depth); |
| 381 | try output(context, ")"); |
| 382 | } |
| 383 | }, |
| 384 | .Union => { |
| 385 | if (comptime std.meta.trait.hasFn("format")(T)) { |
| 386 | return value.format(fmt, options, context, Errors, output); |
| 387 | } |
| 388 | |
| 389 | try output(context, @typeName(T)); |
| 390 | if (max_depth == 0) { |
| 391 | return output(context, "{ ... }"); |
| 392 | } |
| 393 | const info = @typeInfo(T).Union; |
| 394 | if (info.tag_type) |UnionTagType| { |
| 395 | try output(context, "{ ."); |
| 396 | try output(context, @tagName(@as(UnionTagType, value))); |
| 397 | try output(context, " = "); |
| 398 | inline for (info.fields) |u_field| { |
| 399 | if (@enumToInt(@as(UnionTagType, value)) == u_field.enum_field.?.value) { |
| 400 | try formatType(@field(value, u_field.name), fmt, options, context, Errors, output, max_depth - 1); |
| 401 | } |
| 402 | } |
| 403 | try output(context, " }"); |
| 404 | } else { |
| 405 | try format(context, Errors, output, "@{x}", .{@ptrToInt(&value)}); |
| 406 | } |
| 407 | }, |
| 408 | .Struct => |StructT| { |
| 409 | if (comptime std.meta.trait.hasFn("format")(T)) { |
| 410 | return value.format(fmt, options, context, Errors, output); |
| 411 | } |
| 412 | |
| 413 | try output(context, @typeName(T)); |
| 414 | if (max_depth == 0) { |
| 415 | return output(context, "{ ... }"); |
| 416 | } |
| 417 | try output(context, "{"); |
| 418 | inline for (StructT.fields) |f, i| { |
| 419 | if (i == 0) { |
| 420 | try output(context, " ."); |
| 421 | } else { |
| 422 | try output(context, ", ."); |
| 423 | } |
| 424 | try output(context, f.name); |
| 425 | try output(context, " = "); |
| 426 | try formatType(@field(value, f.name), fmt, options, context, Errors, output, max_depth - 1); |
| 427 | } |
| 428 | try output(context, " }"); |
| 429 | }, |
| 430 | .Pointer => |ptr_info| switch (ptr_info.size) { |
| 431 | .One => switch (@typeInfo(ptr_info.child)) { |
| 432 | .Array => |info| { |
| 433 | if (info.child == u8) { |
| 434 | return formatText(value, fmt, options, context, Errors, output); |
| 435 | } |
| 436 | return format(context, Errors, output, "{}@{x}", .{ @typeName(T.Child), @ptrToInt(value) }); |
| 437 | }, |
| 438 | .Enum, .Union, .Struct => { |
| 439 | return formatType(value.*, fmt, options, context, Errors, output, max_depth); |
| 440 | }, |
| 441 | else => return format(context, Errors, output, "{}@{x}", .{ @typeName(T.Child), @ptrToInt(value) }), |
| 442 | }, |
| 443 | .Many, .C => { |
| 444 | if (ptr_info.sentinel) |sentinel| { |
| 445 | return formatType(mem.span(value), fmt, options, context, Errors, output, max_depth); |
| 446 | } |
| 447 | if (ptr_info.child == u8) { |
| 448 | if (fmt.len > 0 and fmt[0] == 's') { |
| 449 | return formatText(mem.span(value), fmt, options, context, Errors, output); |
| 450 | } |
| 451 | } |
| 452 | return format(context, Errors, output, "{}@{x}", .{ @typeName(T.Child), @ptrToInt(value) }); |
| 453 | }, |
| 454 | .Slice => { |
| 455 | if (fmt.len > 0 and ((fmt[0] == 'x') or (fmt[0] == 'X'))) { |
| 456 | return formatText(value, fmt, options, context, Errors, output); |
| 457 | } |
| 458 | if (ptr_info.child == u8) { |
| 459 | return formatText(value, fmt, options, context, Errors, output); |
| 460 | } |
| 461 | return format(context, Errors, output, "{}@{x}", .{ @typeName(ptr_info.child), @ptrToInt(value.ptr) }); |
| 462 | }, |
| 463 | }, |
| 464 | .Array => |info| { |
| 465 | const Slice = @Type(builtin.TypeInfo{ |
| 466 | .Pointer = .{ |
| 467 | .size = .Slice, |
| 468 | .is_const = true, |
| 469 | .is_volatile = false, |
| 470 | .is_allowzero = false, |
| 471 | .alignment = @alignOf(info.child), |
| 472 | .child = info.child, |
| 473 | .sentinel = null, |
| 474 | }, |
| 475 | }); |
| 476 | return formatType(@as(Slice, &value), fmt, options, context, Errors, output, max_depth); |
| 477 | }, |
| 478 | .Vector => { |
| 479 | const len = @typeInfo(T).Vector.len; |
| 480 | try output(context, "{ "); |
| 481 | var i: usize = 0; |
| 482 | while (i < len) : (i += 1) { |
| 483 | try formatValue(value[i], fmt, options, context, Errors, output); |
| 484 | if (i < len - 1) { |
| 485 | try output(context, ", "); |
| 486 | } |
| 487 | } |
| 488 | try output(context, " }"); |
| 489 | }, |
| 490 | .Fn => { |
| 491 | return format(context, Errors, output, "{}@{x}", .{ @typeName(T), @ptrToInt(value) }); |
| 492 | }, |
| 493 | .Type => return output(context, @typeName(T)), |
| 494 | .EnumLiteral => { |
| 495 | const buffer = [_]u8{'.'} ++ @tagName(value); |
| 496 | return formatType(buffer, fmt, options, context, Errors, output, max_depth); |
| 497 | }, |
| 498 | else => @compileError("Unable to format type '" ++ @typeName(T) ++ "'"), |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | fn formatValue( |
| 503 | value: var, |
| 504 | comptime fmt: []const u8, |
| 505 | options: FormatOptions, |
| 506 | context: var, |
| 507 | comptime Errors: type, |
| 508 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 509 | ) Errors!void { |
| 510 | if (comptime std.mem.eql(u8, fmt, "B")) { |
| 511 | return formatBytes(value, options, 1000, context, Errors, output); |
| 512 | } else if (comptime std.mem.eql(u8, fmt, "Bi")) { |
| 513 | return formatBytes(value, options, 1024, context, Errors, output); |
| 514 | } |
| 515 | |
| 516 | const T = @TypeOf(value); |
| 517 | switch (@typeInfo(T)) { |
| 518 | .Float => return formatFloatValue(value, fmt, options, context, Errors, output), |
| 519 | .Int, .ComptimeInt => return formatIntValue(value, fmt, options, context, Errors, output), |
| 520 | .Bool => return output(context, if (value) "true" else "false"), |
| 521 | else => comptime unreachable, |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | pub fn formatIntValue( |
| 526 | value: var, |
| 527 | comptime fmt: []const u8, |
| 528 | options: FormatOptions, |
| 529 | context: var, |
| 530 | comptime Errors: type, |
| 531 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 532 | ) Errors!void { |
| 533 | comptime var radix = 10; |
| 534 | comptime var uppercase = false; |
| 535 | |
| 536 | const int_value = if (@TypeOf(value) == comptime_int) blk: { |
| 537 | const Int = math.IntFittingRange(value, value); |
| 538 | break :blk @as(Int, value); |
| 539 | } else |
| 540 | value; |
| 541 | |
| 542 | if (fmt.len == 0 or comptime std.mem.eql(u8, fmt, "d")) { |
| 543 | radix = 10; |
| 544 | uppercase = false; |
| 545 | } else if (comptime std.mem.eql(u8, fmt, "c")) { |
| 546 | if (@TypeOf(int_value).bit_count <= 8) { |
| 547 | return formatAsciiChar(@as(u8, int_value), options, context, Errors, output); |
| 548 | } else { |
| 549 | @compileError("Cannot print integer that is larger than 8 bits as a ascii"); |
| 550 | } |
| 551 | } else if (comptime std.mem.eql(u8, fmt, "b")) { |
| 552 | radix = 2; |
| 553 | uppercase = false; |
| 554 | } else if (comptime std.mem.eql(u8, fmt, "x")) { |
| 555 | radix = 16; |
| 556 | uppercase = false; |
| 557 | } else if (comptime std.mem.eql(u8, fmt, "X")) { |
| 558 | radix = 16; |
| 559 | uppercase = true; |
| 560 | } else { |
| 561 | @compileError("Unknown format string: '" ++ fmt ++ "'"); |
| 562 | } |
| 563 | |
| 564 | return formatInt(int_value, radix, uppercase, options, context, Errors, output); |
| 565 | } |
| 566 | |
| 567 | fn formatFloatValue( |
| 568 | value: var, |
| 569 | comptime fmt: []const u8, |
| 570 | options: FormatOptions, |
| 571 | context: var, |
| 572 | comptime Errors: type, |
| 573 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 574 | ) Errors!void { |
| 575 | if (fmt.len == 0 or comptime std.mem.eql(u8, fmt, "e")) { |
| 576 | return formatFloatScientific(value, options, context, Errors, output); |
| 577 | } else if (comptime std.mem.eql(u8, fmt, "d")) { |
| 578 | return formatFloatDecimal(value, options, context, Errors, output); |
| 579 | } else { |
| 580 | @compileError("Unknown format string: '" ++ fmt ++ "'"); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | pub fn formatText( |
| 585 | bytes: []const u8, |
| 586 | comptime fmt: []const u8, |
| 587 | options: FormatOptions, |
| 588 | context: var, |
| 589 | comptime Errors: type, |
| 590 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 591 | ) Errors!void { |
| 592 | if (fmt.len == 0) { |
| 593 | return output(context, bytes); |
| 594 | } else if (comptime std.mem.eql(u8, fmt, "s")) { |
| 595 | return formatBuf(bytes, options, context, Errors, output); |
| 596 | } else if (comptime (std.mem.eql(u8, fmt, "x") or std.mem.eql(u8, fmt, "X"))) { |
| 597 | for (bytes) |c| { |
| 598 | try formatInt(c, 16, fmt[0] == 'X', FormatOptions{ .width = 2, .fill = '0' }, context, Errors, output); |
| 599 | } |
| 600 | return; |
| 601 | } else { |
| 602 | @compileError("Unknown format string: '" ++ fmt ++ "'"); |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | pub fn formatAsciiChar( |
| 607 | c: u8, |
| 608 | options: FormatOptions, |
| 609 | context: var, |
| 610 | comptime Errors: type, |
| 611 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 612 | ) Errors!void { |
| 613 | return output(context, @as(*const [1]u8, &c)[0..]); |
| 614 | } |
| 615 | |
| 616 | pub fn formatBuf( |
| 617 | buf: []const u8, |
| 618 | options: FormatOptions, |
| 619 | context: var, |
| 620 | comptime Errors: type, |
| 621 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 622 | ) Errors!void { |
| 623 | try output(context, buf); |
| 624 | |
| 625 | const width = options.width orelse 0; |
| 626 | var leftover_padding = if (width > buf.len) (width - buf.len) else return; |
| 627 | const pad_byte: u8 = options.fill; |
| 628 | while (leftover_padding > 0) : (leftover_padding -= 1) { |
| 629 | try output(context, @as(*const [1]u8, &pad_byte)[0..1]); |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | // Print a float in scientific notation to the specified precision. Null uses full precision. |
| 634 | // It should be the case that every full precision, printed value can be re-parsed back to the |
| 635 | // same type unambiguously. |
| 636 | pub fn formatFloatScientific( |
| 637 | value: var, |
| 638 | options: FormatOptions, |
| 639 | context: var, |
| 640 | comptime Errors: type, |
| 641 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 642 | ) Errors!void { |
| 643 | var x = @floatCast(f64, value); |
| 644 | |
| 645 | // Errol doesn't handle these special cases. |
| 646 | if (math.signbit(x)) { |
| 647 | try output(context, "-"); |
| 648 | x = -x; |
| 649 | } |
| 650 | |
| 651 | if (math.isNan(x)) { |
| 652 | return output(context, "nan"); |
| 653 | } |
| 654 | if (math.isPositiveInf(x)) { |
| 655 | return output(context, "inf"); |
| 656 | } |
| 657 | if (x == 0.0) { |
| 658 | try output(context, "0"); |
| 659 | |
| 660 | if (options.precision) |precision| { |
| 661 | if (precision != 0) { |
| 662 | try output(context, "."); |
| 663 | var i: usize = 0; |
| 664 | while (i < precision) : (i += 1) { |
| 665 | try output(context, "0"); |
| 666 | } |
| 667 | } |
| 668 | } else { |
| 669 | try output(context, ".0"); |
| 670 | } |
| 671 | |
| 672 | try output(context, "e+00"); |
| 673 | return; |
| 674 | } |
| 675 | |
| 676 | var buffer: [32]u8 = undefined; |
| 677 | var float_decimal = errol.errol3(x, buffer[0..]); |
| 678 | |
| 679 | if (options.precision) |precision| { |
| 680 | errol.roundToPrecision(&float_decimal, precision, errol.RoundMode.Scientific); |
| 681 | |
| 682 | try output(context, float_decimal.digits[0..1]); |
| 683 | |
| 684 | // {e0} case prints no `.` |
| 685 | if (precision != 0) { |
| 686 | try output(context, "."); |
| 687 | |
| 688 | var printed: usize = 0; |
| 689 | if (float_decimal.digits.len > 1) { |
| 690 | const num_digits = math.min(float_decimal.digits.len, precision + 1); |
| 691 | try output(context, float_decimal.digits[1..num_digits]); |
| 692 | printed += num_digits - 1; |
| 693 | } |
| 694 | |
| 695 | while (printed < precision) : (printed += 1) { |
| 696 | try output(context, "0"); |
| 697 | } |
| 698 | } |
| 699 | } else { |
| 700 | try output(context, float_decimal.digits[0..1]); |
| 701 | try output(context, "."); |
| 702 | if (float_decimal.digits.len > 1) { |
| 703 | const num_digits = if (@TypeOf(value) == f32) math.min(@as(usize, 9), float_decimal.digits.len) else float_decimal.digits.len; |
| 704 | |
| 705 | try output(context, float_decimal.digits[1..num_digits]); |
| 706 | } else { |
| 707 | try output(context, "0"); |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | try output(context, "e"); |
| 712 | const exp = float_decimal.exp - 1; |
| 713 | |
| 714 | if (exp >= 0) { |
| 715 | try output(context, "+"); |
| 716 | if (exp > -10 and exp < 10) { |
| 717 | try output(context, "0"); |
| 718 | } |
| 719 | try formatInt(exp, 10, false, FormatOptions{ .width = 0 }, context, Errors, output); |
| 720 | } else { |
| 721 | try output(context, "-"); |
| 722 | if (exp > -10 and exp < 10) { |
| 723 | try output(context, "0"); |
| 724 | } |
| 725 | try formatInt(-exp, 10, false, FormatOptions{ .width = 0 }, context, Errors, output); |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | // Print a float of the format x.yyyyy where the number of y is specified by the precision argument. |
| 730 | // By default floats are printed at full precision (no rounding). |
| 731 | pub fn formatFloatDecimal( |
| 732 | value: var, |
| 733 | options: FormatOptions, |
| 734 | context: var, |
| 735 | comptime Errors: type, |
| 736 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 737 | ) Errors!void { |
| 738 | var x = @as(f64, value); |
| 739 | |
| 740 | // Errol doesn't handle these special cases. |
| 741 | if (math.signbit(x)) { |
| 742 | try output(context, "-"); |
| 743 | x = -x; |
| 744 | } |
| 745 | |
| 746 | if (math.isNan(x)) { |
| 747 | return output(context, "nan"); |
| 748 | } |
| 749 | if (math.isPositiveInf(x)) { |
| 750 | return output(context, "inf"); |
| 751 | } |
| 752 | if (x == 0.0) { |
| 753 | try output(context, "0"); |
| 754 | |
| 755 | if (options.precision) |precision| { |
| 756 | if (precision != 0) { |
| 757 | try output(context, "."); |
| 758 | var i: usize = 0; |
| 759 | while (i < precision) : (i += 1) { |
| 760 | try output(context, "0"); |
| 761 | } |
| 762 | } else { |
| 763 | try output(context, ".0"); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | return; |
| 768 | } |
| 769 | |
| 770 | // non-special case, use errol3 |
| 771 | var buffer: [32]u8 = undefined; |
| 772 | var float_decimal = errol.errol3(x, buffer[0..]); |
| 773 | |
| 774 | if (options.precision) |precision| { |
| 775 | errol.roundToPrecision(&float_decimal, precision, errol.RoundMode.Decimal); |
| 776 | |
| 777 | // exp < 0 means the leading is always 0 as errol result is normalized. |
| 778 | var num_digits_whole = if (float_decimal.exp > 0) @intCast(usize, float_decimal.exp) else 0; |
| 779 | |
| 780 | // the actual slice into the buffer, we may need to zero-pad between num_digits_whole and this. |
| 781 | var num_digits_whole_no_pad = math.min(num_digits_whole, float_decimal.digits.len); |
| 782 | |
| 783 | if (num_digits_whole > 0) { |
| 784 | // We may have to zero pad, for instance 1e4 requires zero padding. |
| 785 | try output(context, float_decimal.digits[0..num_digits_whole_no_pad]); |
| 786 | |
| 787 | var i = num_digits_whole_no_pad; |
| 788 | while (i < num_digits_whole) : (i += 1) { |
| 789 | try output(context, "0"); |
| 790 | } |
| 791 | } else { |
| 792 | try output(context, "0"); |
| 793 | } |
| 794 | |
| 795 | // {.0} special case doesn't want a trailing '.' |
| 796 | if (precision == 0) { |
| 797 | return; |
| 798 | } |
| 799 | |
| 800 | try output(context, "."); |
| 801 | |
| 802 | // Keep track of fractional count printed for case where we pre-pad then post-pad with 0's. |
| 803 | var printed: usize = 0; |
| 804 | |
| 805 | // Zero-fill until we reach significant digits or run out of precision. |
| 806 | if (float_decimal.exp <= 0) { |
| 807 | const zero_digit_count = @intCast(usize, -float_decimal.exp); |
| 808 | const zeros_to_print = math.min(zero_digit_count, precision); |
| 809 | |
| 810 | var i: usize = 0; |
| 811 | while (i < zeros_to_print) : (i += 1) { |
| 812 | try output(context, "0"); |
| 813 | printed += 1; |
| 814 | } |
| 815 | |
| 816 | if (printed >= precision) { |
| 817 | return; |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | // Remaining fractional portion, zero-padding if insufficient. |
| 822 | assert(precision >= printed); |
| 823 | if (num_digits_whole_no_pad + precision - printed < float_decimal.digits.len) { |
| 824 | try output(context, float_decimal.digits[num_digits_whole_no_pad .. num_digits_whole_no_pad + precision - printed]); |
| 825 | return; |
| 826 | } else { |
| 827 | try output(context, float_decimal.digits[num_digits_whole_no_pad..]); |
| 828 | printed += float_decimal.digits.len - num_digits_whole_no_pad; |
| 829 | |
| 830 | while (printed < precision) : (printed += 1) { |
| 831 | try output(context, "0"); |
| 832 | } |
| 833 | } |
| 834 | } else { |
| 835 | // exp < 0 means the leading is always 0 as errol result is normalized. |
| 836 | var num_digits_whole = if (float_decimal.exp > 0) @intCast(usize, float_decimal.exp) else 0; |
| 837 | |
| 838 | // the actual slice into the buffer, we may need to zero-pad between num_digits_whole and this. |
| 839 | var num_digits_whole_no_pad = math.min(num_digits_whole, float_decimal.digits.len); |
| 840 | |
| 841 | if (num_digits_whole > 0) { |
| 842 | // We may have to zero pad, for instance 1e4 requires zero padding. |
| 843 | try output(context, float_decimal.digits[0..num_digits_whole_no_pad]); |
| 844 | |
| 845 | var i = num_digits_whole_no_pad; |
| 846 | while (i < num_digits_whole) : (i += 1) { |
| 847 | try output(context, "0"); |
| 848 | } |
| 849 | } else { |
| 850 | try output(context, "0"); |
| 851 | } |
| 852 | |
| 853 | // Omit `.` if no fractional portion |
| 854 | if (float_decimal.exp >= 0 and num_digits_whole_no_pad == float_decimal.digits.len) { |
| 855 | return; |
| 856 | } |
| 857 | |
| 858 | try output(context, "."); |
| 859 | |
| 860 | // Zero-fill until we reach significant digits or run out of precision. |
| 861 | if (float_decimal.exp < 0) { |
| 862 | const zero_digit_count = @intCast(usize, -float_decimal.exp); |
| 863 | |
| 864 | var i: usize = 0; |
| 865 | while (i < zero_digit_count) : (i += 1) { |
| 866 | try output(context, "0"); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | try output(context, float_decimal.digits[num_digits_whole_no_pad..]); |
| 871 | } |
| 872 | } |
| 873 | |
| 874 | pub fn formatBytes( |
| 875 | value: var, |
| 876 | options: FormatOptions, |
| 877 | comptime radix: usize, |
| 878 | context: var, |
| 879 | comptime Errors: type, |
| 880 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 881 | ) Errors!void { |
| 882 | if (value == 0) { |
| 883 | return output(context, "0B"); |
| 884 | } |
| 885 | |
| 886 | const mags_si = " kMGTPEZY"; |
| 887 | const mags_iec = " KMGTPEZY"; |
| 888 | const magnitude = switch (radix) { |
| 889 | 1000 => math.min(math.log2(value) / comptime math.log2(1000), mags_si.len - 1), |
| 890 | 1024 => math.min(math.log2(value) / 10, mags_iec.len - 1), |
| 891 | else => unreachable, |
| 892 | }; |
| 893 | const new_value = lossyCast(f64, value) / math.pow(f64, lossyCast(f64, radix), lossyCast(f64, magnitude)); |
| 894 | const suffix = switch (radix) { |
| 895 | 1000 => mags_si[magnitude], |
| 896 | 1024 => mags_iec[magnitude], |
| 897 | else => unreachable, |
| 898 | }; |
| 899 | |
| 900 | try formatFloatDecimal(new_value, options, context, Errors, output); |
| 901 | |
| 902 | if (suffix == ' ') { |
| 903 | return output(context, "B"); |
| 904 | } |
| 905 | |
| 906 | const buf = switch (radix) { |
| 907 | 1000 => &[_]u8{ suffix, 'B' }, |
| 908 | 1024 => &[_]u8{ suffix, 'i', 'B' }, |
| 909 | else => unreachable, |
| 910 | }; |
| 911 | return output(context, buf); |
| 912 | } |
| 913 | |
| 914 | pub fn formatInt( |
| 915 | value: var, |
| 916 | base: u8, |
| 917 | uppercase: bool, |
| 918 | options: FormatOptions, |
| 919 | context: var, |
| 920 | comptime Errors: type, |
| 921 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 922 | ) Errors!void { |
| 923 | const int_value = if (@TypeOf(value) == comptime_int) blk: { |
| 924 | const Int = math.IntFittingRange(value, value); |
| 925 | break :blk @as(Int, value); |
| 926 | } else |
| 927 | value; |
| 928 | |
| 929 | if (@TypeOf(int_value).is_signed) { |
| 930 | return formatIntSigned(int_value, base, uppercase, options, context, Errors, output); |
| 931 | } else { |
| 932 | return formatIntUnsigned(int_value, base, uppercase, options, context, Errors, output); |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | fn formatIntSigned( |
| 937 | value: var, |
| 938 | base: u8, |
| 939 | uppercase: bool, |
| 940 | options: FormatOptions, |
| 941 | context: var, |
| 942 | comptime Errors: type, |
| 943 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 944 | ) Errors!void { |
| 945 | const new_options = FormatOptions{ |
| 946 | .width = if (options.width) |w| (if (w == 0) 0 else w - 1) else null, |
| 947 | .precision = options.precision, |
| 948 | .fill = options.fill, |
| 949 | }; |
| 950 | const bit_count = @typeInfo(@TypeOf(value)).Int.bits; |
| 951 | const Uint = std.meta.IntType(false, bit_count); |
| 952 | if (value < 0) { |
| 953 | try output(context, "-"); |
| 954 | const new_value = math.absCast(value); |
| 955 | return formatIntUnsigned(new_value, base, uppercase, new_options, context, Errors, output); |
| 956 | } else if (options.width == null or options.width.? == 0) { |
| 957 | return formatIntUnsigned(@intCast(Uint, value), base, uppercase, options, context, Errors, output); |
| 958 | } else { |
| 959 | try output(context, "+"); |
| 960 | const new_value = @intCast(Uint, value); |
| 961 | return formatIntUnsigned(new_value, base, uppercase, new_options, context, Errors, output); |
| 962 | } |
| 963 | } |
| 964 | |
| 965 | fn formatIntUnsigned( |
| 966 | value: var, |
| 967 | base: u8, |
| 968 | uppercase: bool, |
| 969 | options: FormatOptions, |
| 970 | context: var, |
| 971 | comptime Errors: type, |
| 972 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 973 | ) Errors!void { |
| 974 | assert(base >= 2); |
| 975 | var buf: [math.max(@TypeOf(value).bit_count, 1)]u8 = undefined; |
| 976 | const min_int_bits = comptime math.max(@TypeOf(value).bit_count, @TypeOf(base).bit_count); |
| 977 | const MinInt = std.meta.IntType(@TypeOf(value).is_signed, min_int_bits); |
| 978 | var a: MinInt = value; |
| 979 | var index: usize = buf.len; |
| 980 | |
| 981 | while (true) { |
| 982 | const digit = a % base; |
| 983 | index -= 1; |
| 984 | buf[index] = digitToChar(@intCast(u8, digit), uppercase); |
| 985 | a /= base; |
| 986 | if (a == 0) break; |
| 987 | } |
| 988 | |
| 989 | const digits_buf = buf[index..]; |
| 990 | const width = options.width orelse 0; |
| 991 | const padding = if (width > digits_buf.len) (width - digits_buf.len) else 0; |
| 992 | |
| 993 | if (padding > index) { |
| 994 | const zero_byte: u8 = options.fill; |
| 995 | var leftover_padding = padding - index; |
| 996 | while (true) { |
| 997 | try output(context, @as(*const [1]u8, &zero_byte)[0..]); |
| 998 | leftover_padding -= 1; |
| 999 | if (leftover_padding == 0) break; |
| 1000 | } |
| 1001 | mem.set(u8, buf[0..index], options.fill); |
| 1002 | return output(context, &buf); |
| 1003 | } else { |
| 1004 | const padded_buf = buf[index - padding ..]; |
| 1005 | mem.set(u8, padded_buf[0..padding], options.fill); |
| 1006 | return output(context, padded_buf); |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | pub fn formatIntBuf(out_buf: []u8, value: var, base: u8, uppercase: bool, options: FormatOptions) usize { |
| 1011 | var context = FormatIntBuf{ |
| 1012 | .out_buf = out_buf, |
| 1013 | .index = 0, |
| 1014 | }; |
| 1015 | formatInt(value, base, uppercase, options, &context, error{}, formatIntCallback) catch unreachable; |
| 1016 | return context.index; |
| 1017 | } |
| 1018 | const FormatIntBuf = struct { |
| 1019 | out_buf: []u8, |
| 1020 | index: usize, |
| 1021 | }; |
| 1022 | fn formatIntCallback(context: *FormatIntBuf, bytes: []const u8) (error{}!void) { |
| 1023 | mem.copy(u8, context.out_buf[context.index..], bytes); |
| 1024 | context.index += bytes.len; |
| 1025 | } |
| 1026 | |
| 1027 | pub fn parseInt(comptime T: type, buf: []const u8, radix: u8) !T { |
| 1028 | if (!T.is_signed) return parseUnsigned(T, buf, radix); |
| 1029 | if (buf.len == 0) return @as(T, 0); |
| 1030 | if (buf[0] == '-') { |
| 1031 | return math.negate(try parseUnsigned(T, buf[1..], radix)); |
| 1032 | } else if (buf[0] == '+') { |
| 1033 | return parseUnsigned(T, buf[1..], radix); |
| 1034 | } else { |
| 1035 | return parseUnsigned(T, buf, radix); |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | test "parseInt" { |
| 1040 | std.testing.expect((parseInt(i32, "-10", 10) catch unreachable) == -10); |
| 1041 | std.testing.expect((parseInt(i32, "+10", 10) catch unreachable) == 10); |
| 1042 | std.testing.expect(if (parseInt(i32, " 10", 10)) |_| false else |err| err == error.InvalidCharacter); |
| 1043 | std.testing.expect(if (parseInt(i32, "10 ", 10)) |_| false else |err| err == error.InvalidCharacter); |
| 1044 | std.testing.expect(if (parseInt(u32, "-10", 10)) |_| false else |err| err == error.InvalidCharacter); |
| 1045 | std.testing.expect((parseInt(u8, "255", 10) catch unreachable) == 255); |
| 1046 | std.testing.expect(if (parseInt(u8, "256", 10)) |_| false else |err| err == error.Overflow); |
| 1047 | } |
| 1048 | |
| 1049 | pub const ParseUnsignedError = error{ |
| 1050 | /// The result cannot fit in the type specified |
| 1051 | Overflow, |
| 1052 | |
| 1053 | /// The input had a byte that was not a digit |
| 1054 | InvalidCharacter, |
| 1055 | }; |
| 1056 | |
| 1057 | pub fn parseUnsigned(comptime T: type, buf: []const u8, radix: u8) ParseUnsignedError!T { |
| 1058 | var x: T = 0; |
| 1059 | |
| 1060 | for (buf) |c| { |
| 1061 | const digit = try charToDigit(c, radix); |
| 1062 | |
| 1063 | if (x != 0) x = try math.mul(T, x, try math.cast(T, radix)); |
| 1064 | x = try math.add(T, x, try math.cast(T, digit)); |
| 1065 | } |
| 1066 | |
| 1067 | return x; |
| 1068 | } |
| 1069 | |
| 1070 | test "parseUnsigned" { |
| 1071 | std.testing.expect((try parseUnsigned(u16, "050124", 10)) == 50124); |
| 1072 | std.testing.expect((try parseUnsigned(u16, "65535", 10)) == 65535); |
| 1073 | std.testing.expectError(error.Overflow, parseUnsigned(u16, "65536", 10)); |
| 1074 | |
| 1075 | std.testing.expect((try parseUnsigned(u64, "0ffffffffffffffff", 16)) == 0xffffffffffffffff); |
| 1076 | std.testing.expectError(error.Overflow, parseUnsigned(u64, "10000000000000000", 16)); |
| 1077 | |
| 1078 | std.testing.expect((try parseUnsigned(u32, "DeadBeef", 16)) == 0xDEADBEEF); |
| 1079 | |
| 1080 | std.testing.expect((try parseUnsigned(u7, "1", 10)) == 1); |
| 1081 | std.testing.expect((try parseUnsigned(u7, "1000", 2)) == 8); |
| 1082 | |
| 1083 | std.testing.expectError(error.InvalidCharacter, parseUnsigned(u32, "f", 10)); |
| 1084 | std.testing.expectError(error.InvalidCharacter, parseUnsigned(u8, "109", 8)); |
| 1085 | |
| 1086 | std.testing.expect((try parseUnsigned(u32, "NUMBER", 36)) == 1442151747); |
| 1087 | |
| 1088 | // these numbers should fit even though the radix itself doesn't fit in the destination type |
| 1089 | std.testing.expect((try parseUnsigned(u1, "0", 10)) == 0); |
| 1090 | std.testing.expect((try parseUnsigned(u1, "1", 10)) == 1); |
| 1091 | std.testing.expectError(error.Overflow, parseUnsigned(u1, "2", 10)); |
| 1092 | std.testing.expect((try parseUnsigned(u1, "001", 16)) == 1); |
| 1093 | std.testing.expect((try parseUnsigned(u2, "3", 16)) == 3); |
| 1094 | std.testing.expectError(error.Overflow, parseUnsigned(u2, "4", 16)); |
| 1095 | } |
| 1096 | |
| 1097 | pub const parseFloat = @import("fmt/parse_float.zig").parseFloat; |
| 1098 | |
| 1099 | test "parseFloat" { |
| 1100 | _ = @import("fmt/parse_float.zig"); |
| 1101 | } |
| 1102 | |
| 1103 | pub fn charToDigit(c: u8, radix: u8) (error{InvalidCharacter}!u8) { |
| 1104 | const value = switch (c) { |
| 1105 | '0'...'9' => c - '0', |
| 1106 | 'A'...'Z' => c - 'A' + 10, |
| 1107 | 'a'...'z' => c - 'a' + 10, |
| 1108 | else => return error.InvalidCharacter, |
| 1109 | }; |
| 1110 | |
| 1111 | if (value >= radix) return error.InvalidCharacter; |
| 1112 | |
| 1113 | return value; |
| 1114 | } |
| 1115 | |
| 1116 | fn digitToChar(digit: u8, uppercase: bool) u8 { |
| 1117 | return switch (digit) { |
| 1118 | 0...9 => digit + '0', |
| 1119 | 10...35 => digit + ((if (uppercase) @as(u8, 'A') else @as(u8, 'a')) - 10), |
| 1120 | else => unreachable, |
| 1121 | }; |
| 1122 | } |
| 1123 | |
| 1124 | const BufPrintContext = struct { |
| 1125 | remaining: []u8, |
| 1126 | }; |
| 1127 | |
| 1128 | fn bufPrintWrite(context: *BufPrintContext, bytes: []const u8) !void { |
| 1129 | if (context.remaining.len < bytes.len) { |
| 1130 | mem.copy(u8, context.remaining, bytes[0..context.remaining.len]); |
| 1131 | return error.BufferTooSmall; |
| 1132 | } |
| 1133 | mem.copy(u8, context.remaining, bytes); |
| 1134 | context.remaining = context.remaining[bytes.len..]; |
| 1135 | } |
| 1136 | |
| 1137 | pub const BufPrintError = error{ |
| 1138 | /// As much as possible was written to the buffer, but it was too small to fit all the printed bytes. |
| 1139 | BufferTooSmall, |
| 1140 | }; |
| 1141 | pub fn bufPrint(buf: []u8, comptime fmt: []const u8, args: var) BufPrintError![]u8 { |
| 1142 | var context = BufPrintContext{ .remaining = buf }; |
| 1143 | try format(&context, BufPrintError, bufPrintWrite, fmt, args); |
| 1144 | return buf[0 .. buf.len - context.remaining.len]; |
| 1145 | } |
| 1146 | |
| 1147 | pub const AllocPrintError = error{OutOfMemory}; |
| 1148 | |
| 1149 | pub fn allocPrint(allocator: *mem.Allocator, comptime fmt: []const u8, args: var) AllocPrintError![]u8 { |
| 1150 | var size: usize = 0; |
| 1151 | format(&size, error{}, countSize, fmt, args) catch |err| switch (err) {}; |
| 1152 | const buf = try allocator.alloc(u8, size); |
| 1153 | return bufPrint(buf, fmt, args) catch |err| switch (err) { |
| 1154 | error.BufferTooSmall => unreachable, // we just counted the size above |
| 1155 | }; |
| 1156 | } |
| 1157 | |
| 1158 | fn countSize(size: *usize, bytes: []const u8) (error{}!void) { |
| 1159 | size.* += bytes.len; |
| 1160 | } |
| 1161 | |
| 1162 | pub fn allocPrint0(allocator: *mem.Allocator, comptime fmt: []const u8, args: var) AllocPrintError![:0]u8 { |
| 1163 | const result = try allocPrint(allocator, fmt ++ "\x00", args); |
| 1164 | return result[0 .. result.len - 1 :0]; |
| 1165 | } |
| 1166 | |
| 1167 | test "bufPrintInt" { |
| 1168 | var buffer: [100]u8 = undefined; |
| 1169 | const buf = buffer[0..]; |
| 1170 | |
| 1171 | std.testing.expectEqualSlices(u8, "-1", bufPrintIntToSlice(buf, @as(i1, -1), 10, false, FormatOptions{})); |
| 1172 | |
| 1173 | std.testing.expectEqualSlices(u8, "-101111000110000101001110", bufPrintIntToSlice(buf, @as(i32, -12345678), 2, false, FormatOptions{})); |
| 1174 | std.testing.expectEqualSlices(u8, "-12345678", bufPrintIntToSlice(buf, @as(i32, -12345678), 10, false, FormatOptions{})); |
| 1175 | std.testing.expectEqualSlices(u8, "-bc614e", bufPrintIntToSlice(buf, @as(i32, -12345678), 16, false, FormatOptions{})); |
| 1176 | std.testing.expectEqualSlices(u8, "-BC614E", bufPrintIntToSlice(buf, @as(i32, -12345678), 16, true, FormatOptions{})); |
| 1177 | |
| 1178 | std.testing.expectEqualSlices(u8, "12345678", bufPrintIntToSlice(buf, @as(u32, 12345678), 10, true, FormatOptions{})); |
| 1179 | |
| 1180 | std.testing.expectEqualSlices(u8, " 666", bufPrintIntToSlice(buf, @as(u32, 666), 10, false, FormatOptions{ .width = 6 })); |
| 1181 | std.testing.expectEqualSlices(u8, " 1234", bufPrintIntToSlice(buf, @as(u32, 0x1234), 16, false, FormatOptions{ .width = 6 })); |
| 1182 | std.testing.expectEqualSlices(u8, "1234", bufPrintIntToSlice(buf, @as(u32, 0x1234), 16, false, FormatOptions{ .width = 1 })); |
| 1183 | |
| 1184 | std.testing.expectEqualSlices(u8, "+42", bufPrintIntToSlice(buf, @as(i32, 42), 10, false, FormatOptions{ .width = 3 })); |
| 1185 | std.testing.expectEqualSlices(u8, "-42", bufPrintIntToSlice(buf, @as(i32, -42), 10, false, FormatOptions{ .width = 3 })); |
| 1186 | } |
| 1187 | |
| 1188 | fn bufPrintIntToSlice(buf: []u8, value: var, base: u8, uppercase: bool, options: FormatOptions) []u8 { |
| 1189 | return buf[0..formatIntBuf(buf, value, base, uppercase, options)]; |
| 1190 | } |
| 1191 | |
| 1192 | test "parse u64 digit too big" { |
| 1193 | _ = parseUnsigned(u64, "123a", 10) catch |err| { |
| 1194 | if (err == error.InvalidCharacter) return; |
| 1195 | unreachable; |
| 1196 | }; |
| 1197 | unreachable; |
| 1198 | } |
| 1199 | |
| 1200 | test "parse unsigned comptime" { |
| 1201 | comptime { |
| 1202 | std.testing.expect((try parseUnsigned(usize, "2", 10)) == 2); |
| 1203 | } |
| 1204 | } |
| 1205 | |
| 1206 | test "optional" { |
| 1207 | { |
| 1208 | const value: ?i32 = 1234; |
| 1209 | try testFmt("optional: 1234\n", "optional: {}\n", .{value}); |
| 1210 | } |
| 1211 | { |
| 1212 | const value: ?i32 = null; |
| 1213 | try testFmt("optional: null\n", "optional: {}\n", .{value}); |
| 1214 | } |
| 1215 | } |
| 1216 | |
| 1217 | test "error" { |
| 1218 | { |
| 1219 | const value: anyerror!i32 = 1234; |
| 1220 | try testFmt("error union: 1234\n", "error union: {}\n", .{value}); |
| 1221 | } |
| 1222 | { |
| 1223 | const value: anyerror!i32 = error.InvalidChar; |
| 1224 | try testFmt("error union: error.InvalidChar\n", "error union: {}\n", .{value}); |
| 1225 | } |
| 1226 | } |
| 1227 | |
| 1228 | test "int.small" { |
| 1229 | { |
| 1230 | const value: u3 = 0b101; |
| 1231 | try testFmt("u3: 5\n", "u3: {}\n", .{value}); |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | test "int.specifier" { |
| 1236 | { |
| 1237 | const value: u8 = 'a'; |
| 1238 | try testFmt("u8: a\n", "u8: {c}\n", .{value}); |
| 1239 | } |
| 1240 | { |
| 1241 | const value: u8 = 0b1100; |
| 1242 | try testFmt("u8: 0b1100\n", "u8: 0b{b}\n", .{value}); |
| 1243 | } |
| 1244 | } |
| 1245 | |
| 1246 | test "int.padded" { |
| 1247 | try testFmt("u8: ' 1'", "u8: '{:4}'", .{@as(u8, 1)}); |
| 1248 | try testFmt("u8: 'xxx1'", "u8: '{:x<4}'", .{@as(u8, 1)}); |
| 1249 | } |
| 1250 | |
| 1251 | test "buffer" { |
| 1252 | { |
| 1253 | var buf1: [32]u8 = undefined; |
| 1254 | var context = BufPrintContext{ .remaining = buf1[0..] }; |
| 1255 | try formatType(1234, "", FormatOptions{}, &context, error{BufferTooSmall}, bufPrintWrite, default_max_depth); |
| 1256 | var res = buf1[0 .. buf1.len - context.remaining.len]; |
| 1257 | std.testing.expect(mem.eql(u8, res, "1234")); |
| 1258 | |
| 1259 | context = BufPrintContext{ .remaining = buf1[0..] }; |
| 1260 | try formatType('a', "c", FormatOptions{}, &context, error{BufferTooSmall}, bufPrintWrite, default_max_depth); |
| 1261 | res = buf1[0 .. buf1.len - context.remaining.len]; |
| 1262 | std.testing.expect(mem.eql(u8, res, "a")); |
| 1263 | |
| 1264 | context = BufPrintContext{ .remaining = buf1[0..] }; |
| 1265 | try formatType(0b1100, "b", FormatOptions{}, &context, error{BufferTooSmall}, bufPrintWrite, default_max_depth); |
| 1266 | res = buf1[0 .. buf1.len - context.remaining.len]; |
| 1267 | std.testing.expect(mem.eql(u8, res, "1100")); |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | test "array" { |
| 1272 | { |
| 1273 | const value: [3]u8 = "abc".*; |
| 1274 | try testFmt("array: abc\n", "array: {}\n", .{value}); |
| 1275 | try testFmt("array: abc\n", "array: {}\n", .{&value}); |
| 1276 | |
| 1277 | var buf: [100]u8 = undefined; |
| 1278 | try testFmt( |
| 1279 | try bufPrint(buf[0..], "array: [3]u8@{x}\n", .{@ptrToInt(&value)}), |
| 1280 | "array: {*}\n", |
| 1281 | .{&value}, |
| 1282 | ); |
| 1283 | } |
| 1284 | } |
| 1285 | |
| 1286 | test "slice" { |
| 1287 | { |
| 1288 | const value: []const u8 = "abc"; |
| 1289 | try testFmt("slice: abc\n", "slice: {}\n", .{value}); |
| 1290 | } |
| 1291 | { |
| 1292 | const value = @intToPtr([*]align(1) const []const u8, 0xdeadbeef)[0..0]; |
| 1293 | try testFmt("slice: []const u8@deadbeef\n", "slice: {}\n", .{value}); |
| 1294 | } |
| 1295 | |
| 1296 | try testFmt("buf: Test \n", "buf: {s:5}\n", .{"Test"}); |
| 1297 | try testFmt("buf: Test\n Other text", "buf: {s}\n Other text", .{"Test"}); |
| 1298 | } |
| 1299 | |
| 1300 | test "pointer" { |
| 1301 | { |
| 1302 | const value = @intToPtr(*align(1) i32, 0xdeadbeef); |
| 1303 | try testFmt("pointer: i32@deadbeef\n", "pointer: {}\n", .{value}); |
| 1304 | try testFmt("pointer: i32@deadbeef\n", "pointer: {*}\n", .{value}); |
| 1305 | } |
| 1306 | { |
| 1307 | const value = @intToPtr(fn () void, 0xdeadbeef); |
| 1308 | try testFmt("pointer: fn() void@deadbeef\n", "pointer: {}\n", .{value}); |
| 1309 | } |
| 1310 | { |
| 1311 | const value = @intToPtr(fn () void, 0xdeadbeef); |
| 1312 | try testFmt("pointer: fn() void@deadbeef\n", "pointer: {}\n", .{value}); |
| 1313 | } |
| 1314 | } |
| 1315 | |
| 1316 | test "cstr" { |
| 1317 | try testFmt( |
| 1318 | "cstr: Test C\n", |
| 1319 | "cstr: {s}\n", |
| 1320 | .{@ptrCast([*c]const u8, "Test C")}, |
| 1321 | ); |
| 1322 | try testFmt( |
| 1323 | "cstr: Test C \n", |
| 1324 | "cstr: {s:10}\n", |
| 1325 | .{@ptrCast([*c]const u8, "Test C")}, |
| 1326 | ); |
| 1327 | } |
| 1328 | |
| 1329 | test "filesize" { |
| 1330 | try testFmt("file size: 63MiB\n", "file size: {Bi}\n", .{@as(usize, 63 * 1024 * 1024)}); |
| 1331 | try testFmt("file size: 66.06MB\n", "file size: {B:.2}\n", .{@as(usize, 63 * 1024 * 1024)}); |
| 1332 | } |
| 1333 | |
| 1334 | test "struct" { |
| 1335 | { |
| 1336 | const Struct = struct { |
| 1337 | field: u8, |
| 1338 | }; |
| 1339 | const value = Struct{ .field = 42 }; |
| 1340 | try testFmt("struct: Struct{ .field = 42 }\n", "struct: {}\n", .{value}); |
| 1341 | try testFmt("struct: Struct{ .field = 42 }\n", "struct: {}\n", .{&value}); |
| 1342 | } |
| 1343 | { |
| 1344 | const Struct = struct { |
| 1345 | a: u0, |
| 1346 | b: u1, |
| 1347 | }; |
| 1348 | const value = Struct{ .a = 0, .b = 1 }; |
| 1349 | try testFmt("struct: Struct{ .a = 0, .b = 1 }\n", "struct: {}\n", .{value}); |
| 1350 | } |
| 1351 | } |
| 1352 | |
| 1353 | test "enum" { |
| 1354 | const Enum = enum { |
| 1355 | One, |
| 1356 | Two, |
| 1357 | }; |
| 1358 | const value = Enum.Two; |
| 1359 | try testFmt("enum: Enum.Two\n", "enum: {}\n", .{value}); |
| 1360 | try testFmt("enum: Enum.Two\n", "enum: {}\n", .{&value}); |
| 1361 | } |
| 1362 | |
| 1363 | test "non-exhaustive enum" { |
| 1364 | const Enum = enum(u16) { |
| 1365 | One = 0x000f, |
| 1366 | Two = 0xbeef, |
| 1367 | _, |
| 1368 | }; |
| 1369 | try testFmt("enum: Enum(15)\n", "enum: {}\n", .{Enum.One}); |
| 1370 | try testFmt("enum: Enum(48879)\n", "enum: {}\n", .{Enum.Two}); |
| 1371 | try testFmt("enum: Enum(4660)\n", "enum: {}\n", .{@intToEnum(Enum, 0x1234)}); |
| 1372 | try testFmt("enum: Enum(f)\n", "enum: {x}\n", .{Enum.One}); |
| 1373 | try testFmt("enum: Enum(beef)\n", "enum: {x}\n", .{Enum.Two}); |
| 1374 | try testFmt("enum: Enum(1234)\n", "enum: {x}\n", .{@intToEnum(Enum, 0x1234)}); |
| 1375 | } |
| 1376 | |
| 1377 | test "float.scientific" { |
| 1378 | try testFmt("f32: 1.34000003e+00", "f32: {e}", .{@as(f32, 1.34)}); |
| 1379 | try testFmt("f32: 1.23400001e+01", "f32: {e}", .{@as(f32, 12.34)}); |
| 1380 | try testFmt("f64: -1.234e+11", "f64: {e}", .{@as(f64, -12.34e10)}); |
| 1381 | try testFmt("f64: 9.99996e-40", "f64: {e}", .{@as(f64, 9.999960e-40)}); |
| 1382 | } |
| 1383 | |
| 1384 | test "float.scientific.precision" { |
| 1385 | try testFmt("f64: 1.40971e-42", "f64: {e:.5}", .{@as(f64, 1.409706e-42)}); |
| 1386 | try testFmt("f64: 1.00000e-09", "f64: {e:.5}", .{@as(f64, @bitCast(f32, @as(u32, 814313563)))}); |
| 1387 | try testFmt("f64: 7.81250e-03", "f64: {e:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1006632960)))}); |
| 1388 | // libc rounds 1.000005e+05 to 1.00000e+05 but zig does 1.00001e+05. |
| 1389 | // In fact, libc doesn't round a lot of 5 cases up when one past the precision point. |
| 1390 | try testFmt("f64: 1.00001e+05", "f64: {e:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1203982400)))}); |
| 1391 | } |
| 1392 | |
| 1393 | test "float.special" { |
| 1394 | try testFmt("f64: nan", "f64: {}", .{math.nan_f64}); |
| 1395 | // negative nan is not defined by IEE 754, |
| 1396 | // and ARM thus normalizes it to positive nan |
| 1397 | if (builtin.arch != builtin.Arch.arm) { |
| 1398 | try testFmt("f64: -nan", "f64: {}", .{-math.nan_f64}); |
| 1399 | } |
| 1400 | try testFmt("f64: inf", "f64: {}", .{math.inf_f64}); |
| 1401 | try testFmt("f64: -inf", "f64: {}", .{-math.inf_f64}); |
| 1402 | } |
| 1403 | |
| 1404 | test "float.decimal" { |
| 1405 | try testFmt("f64: 152314000000000000000000000000", "f64: {d}", .{@as(f64, 1.52314e+29)}); |
| 1406 | try testFmt("f32: 0", "f32: {d}", .{@as(f32, 0.0)}); |
| 1407 | try testFmt("f32: 1.1", "f32: {d:.1}", .{@as(f32, 1.1234)}); |
| 1408 | try testFmt("f32: 1234.57", "f32: {d:.2}", .{@as(f32, 1234.567)}); |
| 1409 | // -11.1234 is converted to f64 -11.12339... internally (errol3() function takes f64). |
| 1410 | // -11.12339... is rounded back up to -11.1234 |
| 1411 | try testFmt("f32: -11.1234", "f32: {d:.4}", .{@as(f32, -11.1234)}); |
| 1412 | try testFmt("f32: 91.12345", "f32: {d:.5}", .{@as(f32, 91.12345)}); |
| 1413 | try testFmt("f64: 91.1234567890", "f64: {d:.10}", .{@as(f64, 91.12345678901235)}); |
| 1414 | try testFmt("f64: 0.00000", "f64: {d:.5}", .{@as(f64, 0.0)}); |
| 1415 | try testFmt("f64: 6", "f64: {d:.0}", .{@as(f64, 5.700)}); |
| 1416 | try testFmt("f64: 10.0", "f64: {d:.1}", .{@as(f64, 9.999)}); |
| 1417 | try testFmt("f64: 1.000", "f64: {d:.3}", .{@as(f64, 1.0)}); |
| 1418 | try testFmt("f64: 0.00030000", "f64: {d:.8}", .{@as(f64, 0.0003)}); |
| 1419 | try testFmt("f64: 0.00000", "f64: {d:.5}", .{@as(f64, 1.40130e-45)}); |
| 1420 | try testFmt("f64: 0.00000", "f64: {d:.5}", .{@as(f64, 9.999960e-40)}); |
| 1421 | } |
| 1422 | |
| 1423 | test "float.libc.sanity" { |
| 1424 | try testFmt("f64: 0.00001", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 916964781)))}); |
| 1425 | try testFmt("f64: 0.00001", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 925353389)))}); |
| 1426 | try testFmt("f64: 0.10000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1036831278)))}); |
| 1427 | try testFmt("f64: 1.00000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1065353133)))}); |
| 1428 | try testFmt("f64: 10.00000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1092616192)))}); |
| 1429 | |
| 1430 | // libc differences |
| 1431 | // |
| 1432 | // This is 0.015625 exactly according to gdb. We thus round down, |
| 1433 | // however glibc rounds up for some reason. This occurs for all |
| 1434 | // floats of the form x.yyyy25 on a precision point. |
| 1435 | try testFmt("f64: 0.01563", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1015021568)))}); |
| 1436 | // errol3 rounds to ... 630 but libc rounds to ...632. Grisu3 |
| 1437 | // also rounds to 630 so I'm inclined to believe libc is not |
| 1438 | // optimal here. |
| 1439 | try testFmt("f64: 18014400656965630.00000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1518338049)))}); |
| 1440 | } |
| 1441 | |
| 1442 | test "custom" { |
| 1443 | const Vec2 = struct { |
| 1444 | const SelfType = @This(); |
| 1445 | x: f32, |
| 1446 | y: f32, |
| 1447 | |
| 1448 | pub fn format( |
| 1449 | self: SelfType, |
| 1450 | comptime fmt: []const u8, |
| 1451 | options: FormatOptions, |
| 1452 | context: var, |
| 1453 | comptime Errors: type, |
| 1454 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 1455 | ) Errors!void { |
| 1456 | if (fmt.len == 0 or comptime std.mem.eql(u8, fmt, "p")) { |
| 1457 | return std.fmt.format(context, Errors, output, "({d:.3},{d:.3})", .{ self.x, self.y }); |
| 1458 | } else if (comptime std.mem.eql(u8, fmt, "d")) { |
| 1459 | return std.fmt.format(context, Errors, output, "{d:.3}x{d:.3}", .{ self.x, self.y }); |
| 1460 | } else { |
| 1461 | @compileError("Unknown format character: '" ++ fmt ++ "'"); |
| 1462 | } |
| 1463 | } |
| 1464 | }; |
| 1465 | |
| 1466 | var buf1: [32]u8 = undefined; |
| 1467 | var value = Vec2{ |
| 1468 | .x = 10.2, |
| 1469 | .y = 2.22, |
| 1470 | }; |
| 1471 | try testFmt("point: (10.200,2.220)\n", "point: {}\n", .{&value}); |
| 1472 | try testFmt("dim: 10.200x2.220\n", "dim: {d}\n", .{&value}); |
| 1473 | |
| 1474 | // same thing but not passing a pointer |
| 1475 | try testFmt("point: (10.200,2.220)\n", "point: {}\n", .{value}); |
| 1476 | try testFmt("dim: 10.200x2.220\n", "dim: {d}\n", .{value}); |
| 1477 | } |
| 1478 | |
| 1479 | test "struct" { |
| 1480 | const S = struct { |
| 1481 | a: u32, |
| 1482 | b: anyerror, |
| 1483 | }; |
| 1484 | |
| 1485 | const inst = S{ |
| 1486 | .a = 456, |
| 1487 | .b = error.Unused, |
| 1488 | }; |
| 1489 | |
| 1490 | try testFmt("S{ .a = 456, .b = error.Unused }", "{}", .{inst}); |
| 1491 | } |
| 1492 | |
| 1493 | test "union" { |
| 1494 | const TU = union(enum) { |
| 1495 | float: f32, |
| 1496 | int: u32, |
| 1497 | }; |
| 1498 | |
| 1499 | const UU = union { |
| 1500 | float: f32, |
| 1501 | int: u32, |
| 1502 | }; |
| 1503 | |
| 1504 | const EU = extern union { |
| 1505 | float: f32, |
| 1506 | int: u32, |
| 1507 | }; |
| 1508 | |
| 1509 | const tu_inst = TU{ .int = 123 }; |
| 1510 | const uu_inst = UU{ .int = 456 }; |
| 1511 | const eu_inst = EU{ .float = 321.123 }; |
| 1512 | |
| 1513 | try testFmt("TU{ .int = 123 }", "{}", .{tu_inst}); |
| 1514 | |
| 1515 | var buf: [100]u8 = undefined; |
| 1516 | const uu_result = try bufPrint(buf[0..], "{}", .{uu_inst}); |
| 1517 | std.testing.expect(mem.eql(u8, uu_result[0..3], "UU@")); |
| 1518 | |
| 1519 | const eu_result = try bufPrint(buf[0..], "{}", .{eu_inst}); |
| 1520 | std.testing.expect(mem.eql(u8, uu_result[0..3], "EU@")); |
| 1521 | } |
| 1522 | |
| 1523 | test "enum" { |
| 1524 | const E = enum { |
| 1525 | One, |
| 1526 | Two, |
| 1527 | Three, |
| 1528 | }; |
| 1529 | |
| 1530 | const inst = E.Two; |
| 1531 | |
| 1532 | try testFmt("E.Two", "{}", .{inst}); |
| 1533 | } |
| 1534 | |
| 1535 | test "struct.self-referential" { |
| 1536 | const S = struct { |
| 1537 | const SelfType = @This(); |
| 1538 | a: ?*SelfType, |
| 1539 | }; |
| 1540 | |
| 1541 | var inst = S{ |
| 1542 | .a = null, |
| 1543 | }; |
| 1544 | inst.a = &inst; |
| 1545 | |
| 1546 | try testFmt("S{ .a = S{ .a = S{ .a = S{ ... } } } }", "{}", .{inst}); |
| 1547 | } |
| 1548 | |
| 1549 | test "struct.zero-size" { |
| 1550 | const A = struct { |
| 1551 | fn foo() void {} |
| 1552 | }; |
| 1553 | const B = struct { |
| 1554 | a: A, |
| 1555 | c: i32, |
| 1556 | }; |
| 1557 | |
| 1558 | const a = A{}; |
| 1559 | const b = B{ .a = a, .c = 0 }; |
| 1560 | |
| 1561 | try testFmt("B{ .a = A{ }, .c = 0 }", "{}", .{b}); |
| 1562 | } |
| 1563 | |
| 1564 | test "bytes.hex" { |
| 1565 | const some_bytes = "\xCA\xFE\xBA\xBE"; |
| 1566 | try testFmt("lowercase: cafebabe\n", "lowercase: {x}\n", .{some_bytes}); |
| 1567 | try testFmt("uppercase: CAFEBABE\n", "uppercase: {X}\n", .{some_bytes}); |
| 1568 | //Test Slices |
| 1569 | try testFmt("uppercase: CAFE\n", "uppercase: {X}\n", .{some_bytes[0..2]}); |
| 1570 | try testFmt("lowercase: babe\n", "lowercase: {x}\n", .{some_bytes[2..]}); |
| 1571 | const bytes_with_zeros = "\x00\x0E\xBA\xBE"; |
| 1572 | try testFmt("lowercase: 000ebabe\n", "lowercase: {x}\n", .{bytes_with_zeros}); |
| 1573 | } |
| 1574 | |
| 1575 | fn testFmt(expected: []const u8, comptime template: []const u8, args: var) !void { |
| 1576 | var buf: [100]u8 = undefined; |
| 1577 | const result = try bufPrint(buf[0..], template, args); |
| 1578 | if (mem.eql(u8, result, expected)) return; |
| 1579 | |
| 1580 | std.debug.warn("\n====== expected this output: =========\n", .{}); |
| 1581 | std.debug.warn("{}", .{expected}); |
| 1582 | std.debug.warn("\n======== instead found this: =========\n", .{}); |
| 1583 | std.debug.warn("{}", .{result}); |
| 1584 | std.debug.warn("\n======================================\n", .{}); |
| 1585 | return error.TestFailed; |
| 1586 | } |
| 1587 | |
| 1588 | pub fn trim(buf: []const u8) []const u8 { |
| 1589 | var start: usize = 0; |
| 1590 | while (start < buf.len and isWhiteSpace(buf[start])) : (start += 1) {} |
| 1591 | |
| 1592 | var end: usize = buf.len; |
| 1593 | while (true) { |
| 1594 | if (end > start) { |
| 1595 | const new_end = end - 1; |
| 1596 | if (isWhiteSpace(buf[new_end])) { |
| 1597 | end = new_end; |
| 1598 | continue; |
| 1599 | } |
| 1600 | } |
| 1601 | break; |
| 1602 | } |
| 1603 | return buf[start..end]; |
| 1604 | } |
| 1605 | |
| 1606 | test "trim" { |
| 1607 | std.testing.expect(mem.eql(u8, "abc", trim("\n abc \t"))); |
| 1608 | std.testing.expect(mem.eql(u8, "", trim(" "))); |
| 1609 | std.testing.expect(mem.eql(u8, "", trim(""))); |
| 1610 | std.testing.expect(mem.eql(u8, "abc", trim(" abc"))); |
| 1611 | std.testing.expect(mem.eql(u8, "abc", trim("abc "))); |
| 1612 | } |
| 1613 | |
| 1614 | pub fn isWhiteSpace(byte: u8) bool { |
| 1615 | return switch (byte) { |
| 1616 | ' ', '\t', '\n', '\r' => true, |
| 1617 | else => false, |
| 1618 | }; |
| 1619 | } |
| 1620 | |
| 1621 | pub fn hexToBytes(out: []u8, input: []const u8) !void { |
| 1622 | if (out.len * 2 < input.len) |
| 1623 | return error.InvalidLength; |
| 1624 | |
| 1625 | var in_i: usize = 0; |
| 1626 | while (in_i != input.len) : (in_i += 2) { |
| 1627 | const hi = try charToDigit(input[in_i], 16); |
| 1628 | const lo = try charToDigit(input[in_i + 1], 16); |
| 1629 | out[in_i / 2] = (hi << 4) | lo; |
| 1630 | } |
| 1631 | } |
| 1632 | |
| 1633 | test "hexToBytes" { |
| 1634 | const test_hex_str = "909A312BB12ED1F819B3521AC4C1E896F2160507FFC1C8381E3B07BB16BD1706"; |
| 1635 | var pb: [32]u8 = undefined; |
| 1636 | try hexToBytes(pb[0..], test_hex_str); |
| 1637 | try testFmt(test_hex_str, "{X}", .{pb}); |
| 1638 | } |
| 1639 | |
| 1640 | test "formatIntValue with comptime_int" { |
| 1641 | const value: comptime_int = 123456789123456789; |
| 1642 | |
| 1643 | var buf = std.ArrayList(u8).init(std.testing.allocator); |
| 1644 | defer buf.deinit(); |
| 1645 | try formatIntValue(value, "", FormatOptions{}, &buf, @TypeOf(std.ArrayList(u8).appendSlice).ReturnType.ErrorSet, std.ArrayList(u8).appendSlice); |
| 1646 | std.testing.expect(mem.eql(u8, buf.toSliceConst(), "123456789123456789")); |
| 1647 | } |
| 1648 | |
| 1649 | test "formatType max_depth" { |
| 1650 | const Vec2 = struct { |
| 1651 | const SelfType = @This(); |
| 1652 | x: f32, |
| 1653 | y: f32, |
| 1654 | |
| 1655 | pub fn format( |
| 1656 | self: SelfType, |
| 1657 | comptime fmt: []const u8, |
| 1658 | options: FormatOptions, |
| 1659 | context: var, |
| 1660 | comptime Errors: type, |
| 1661 | comptime output: fn (@TypeOf(context), []const u8) Errors!void, |
| 1662 | ) Errors!void { |
| 1663 | if (fmt.len == 0) { |
| 1664 | return std.fmt.format(context, Errors, output, "({d:.3},{d:.3})", .{ self.x, self.y }); |
| 1665 | } else { |
| 1666 | @compileError("Unknown format string: '" ++ fmt ++ "'"); |
| 1667 | } |
| 1668 | } |
| 1669 | }; |
| 1670 | const E = enum { |
| 1671 | One, |
| 1672 | Two, |
| 1673 | Three, |
| 1674 | }; |
| 1675 | const TU = union(enum) { |
| 1676 | const SelfType = @This(); |
| 1677 | float: f32, |
| 1678 | int: u32, |
| 1679 | ptr: ?*SelfType, |
| 1680 | }; |
| 1681 | const S = struct { |
| 1682 | const SelfType = @This(); |
| 1683 | a: ?*SelfType, |
| 1684 | tu: TU, |
| 1685 | e: E, |
| 1686 | vec: Vec2, |
| 1687 | }; |
| 1688 | |
| 1689 | var inst = S{ |
| 1690 | .a = null, |
| 1691 | .tu = TU{ .ptr = null }, |
| 1692 | .e = E.Two, |
| 1693 | .vec = Vec2{ .x = 10.2, .y = 2.22 }, |
| 1694 | }; |
| 1695 | inst.a = &inst; |
| 1696 | inst.tu.ptr = &inst.tu; |
| 1697 | |
| 1698 | var buf0 = std.ArrayList(u8).init(std.testing.allocator); |
| 1699 | defer buf0.deinit(); |
| 1700 | try formatType(inst, "", FormatOptions{}, &buf0, @TypeOf(std.ArrayList(u8).appendSlice).ReturnType.ErrorSet, std.ArrayList(u8).appendSlice, 0); |
| 1701 | std.testing.expect(mem.eql(u8, buf0.toSlice(), "S{ ... }")); |
| 1702 | |
| 1703 | var buf1 = std.ArrayList(u8).init(std.testing.allocator); |
| 1704 | defer buf1.deinit(); |
| 1705 | try formatType(inst, "", FormatOptions{}, &buf1, @TypeOf(std.ArrayList(u8).appendSlice).ReturnType.ErrorSet, std.ArrayList(u8).appendSlice, 1); |
| 1706 | std.testing.expect(mem.eql(u8, buf1.toSlice(), "S{ .a = S{ ... }, .tu = TU{ ... }, .e = E.Two, .vec = (10.200,2.220) }")); |
| 1707 | |
| 1708 | var buf2 = std.ArrayList(u8).init(std.testing.allocator); |
| 1709 | defer buf2.deinit(); |
| 1710 | try formatType(inst, "", FormatOptions{}, &buf2, @TypeOf(std.ArrayList(u8).appendSlice).ReturnType.ErrorSet, std.ArrayList(u8).appendSlice, 2); |
| 1711 | std.testing.expect(mem.eql(u8, buf2.toSlice(), "S{ .a = S{ .a = S{ ... }, .tu = TU{ ... }, .e = E.Two, .vec = (10.200,2.220) }, .tu = TU{ .ptr = TU{ ... } }, .e = E.Two, .vec = (10.200,2.220) }")); |
| 1712 | |
| 1713 | var buf3 = std.ArrayList(u8).init(std.testing.allocator); |
| 1714 | defer buf3.deinit(); |
| 1715 | try formatType(inst, "", FormatOptions{}, &buf3, @TypeOf(std.ArrayList(u8).appendSlice).ReturnType.ErrorSet, std.ArrayList(u8).appendSlice, 3); |
| 1716 | std.testing.expect(mem.eql(u8, buf3.toSlice(), "S{ .a = S{ .a = S{ .a = S{ ... }, .tu = TU{ ... }, .e = E.Two, .vec = (10.200,2.220) }, .tu = TU{ .ptr = TU{ ... } }, .e = E.Two, .vec = (10.200,2.220) }, .tu = TU{ .ptr = TU{ .ptr = TU{ ... } } }, .e = E.Two, .vec = (10.200,2.220) }")); |
| 1717 | } |
| 1718 | |
| 1719 | test "positional" { |
| 1720 | try testFmt("2 1 0", "{2} {1} {0}", .{ @as(usize, 0), @as(usize, 1), @as(usize, 2) }); |
| 1721 | try testFmt("2 1 0", "{2} {1} {}", .{ @as(usize, 0), @as(usize, 1), @as(usize, 2) }); |
| 1722 | try testFmt("0 0", "{0} {0}", .{@as(usize, 0)}); |
| 1723 | try testFmt("0 1", "{} {1}", .{ @as(usize, 0), @as(usize, 1) }); |
| 1724 | try testFmt("1 0 0 1", "{1} {} {0} {}", .{ @as(usize, 0), @as(usize, 1) }); |
| 1725 | } |
| 1726 | |
| 1727 | test "positional with specifier" { |
| 1728 | try testFmt("10.0", "{0d:.1}", .{@as(f64, 9.999)}); |
| 1729 | } |
| 1730 | |
| 1731 | test "positional/alignment/width/precision" { |
| 1732 | try testFmt("10.0", "{0d: >3.1}", .{@as(f64, 9.999)}); |
| 1733 | } |
| 1734 | |
| 1735 | test "vector" { |
| 1736 | // https://github.com/ziglang/zig/issues/3317 |
| 1737 | if (builtin.arch == .mipsel) return error.SkipZigTest; |
| 1738 | |
| 1739 | const vbool: @Vector(4, bool) = [_]bool{ true, false, true, false }; |
| 1740 | const vi64: @Vector(4, i64) = [_]i64{ -2, -1, 0, 1 }; |
| 1741 | const vu64: @Vector(4, u64) = [_]u64{ 1000, 2000, 3000, 4000 }; |
| 1742 | |
| 1743 | try testFmt("{ true, false, true, false }", "{}", .{vbool}); |
| 1744 | try testFmt("{ -2, -1, 0, 1 }", "{}", .{vi64}); |
| 1745 | try testFmt("{ - 2, - 1, + 0, + 1 }", "{d:5}", .{vi64}); |
| 1746 | try testFmt("{ 1000, 2000, 3000, 4000 }", "{}", .{vu64}); |
| 1747 | try testFmt("{ 3e8, 7d0, bb8, fa0 }", "{x}", .{vu64}); |
| 1748 | try testFmt("{ 1kB, 2kB, 3kB, 4kB }", "{B}", .{vu64}); |
| 1749 | try testFmt("{ 1000B, 1.953125KiB, 2.9296875KiB, 3.90625KiB }", "{Bi}", .{vu64}); |
| 1750 | } |
| 1751 | |
| 1752 | test "enum-literal" { |
| 1753 | try testFmt(".hello_world", "{}", .{.hello_world}); |
| 1754 | } |
Benjamin Feng <benjamin.feng@glassdoor.com> 2020-02-29 11:56:21-06:00
lib