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GeezerVison is showing github.com — gpython/py/string.go at main · go-python/gpython Expand file tree/ Copy pathstring.goMore file actions 837 lines (735 loc) · 22.6 KB / Copy pathstring.goFile metadata and controls837 lines (735 loc) · 22.6 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 // Copyright 2018 The go-python Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // String objects // // Note that string objects in Python are arrays of unicode // characters. However we are using the native Go string which is // UTF-8 encoded. This makes very little difference most of the time, // but care is needed when indexing, slicing or iterating through // strings. package py import ( "bytes" "fmt" "strconv" "strings" "unicode" "unicode/utf8" ) type String string var StringType = ObjectType.NewType("str", `str(object='') -> str str(bytes_or_buffer[, encoding[, errors]]) -> str Create a new string object from the given object. If encoding or errors is specified, then the object must expose a data buffer that will be decoded using the given encoding and error handler. Otherwise, returns the result of object.__str__() (if defined) or repr(object). encoding defaults to sys.getdefaultencoding(). errors defaults to 'strict'.`, StrNew, nil) // Escape the py.String func StringEscape(a String, ascii bool) string { s := string(a) var out bytes.Buffer quote := '\'' if strings.ContainsRune(s, '\'') && !strings.ContainsRune(s, '"') { quote = '"' } if !ascii { out.WriteRune(quote) } for _, c := range s { switch { case c < 0x20: switch c { case '\t': out.WriteString(`\t`) case '\n': out.WriteString(`\n`) case '\r': out.WriteString(`\r`) default: fmt.Fprintf(&out, `\x%02x`, c) } case !ascii && c < 0x7F: if c == '\\' || (quote == '\'' && c == '\'') || (quote == '"' && c == '"') { out.WriteRune('\\') } out.WriteRune(c) case c < 0x100: if ascii || strconv.IsPrint(c) { out.WriteRune(c) } else { fmt.Fprintf(&out, "\\x%02x", c) } case c < 0x10000: if !ascii && strconv.IsPrint(c) { out.WriteRune(c) } else { fmt.Fprintf(&out, "\\u%04x", c) } default: if !ascii && strconv.IsPrint(c) { out.WriteRune(c) } else { fmt.Fprintf(&out, "\\U%08x", c) } } } if !ascii { out.WriteRune(quote) } return out.String() } // standard golang strings.Fields doesn't have a 'first N' argument func fieldsN(s string, n int) []string { out := []string{} cur := []rune{} for _, c := range s { //until we have covered the first N elements, multiple white-spaces are 'merged' if n < 0 || len(out) < n { if unicode.IsSpace(c) { if len(cur) > 0 { out = append(out, string(cur)) cur = []rune{} } } else { cur = append(cur, c) } //until we see the next letter, after collecting the first N fields, continue to merge whitespaces } else if len(out) == n && len(cur) == 0 { if !unicode.IsSpace(c) { cur = append(cur, c) } //now that enough words have been collected, just copy into the last element } else { cur = append(cur, c) } } if len(cur) > 0 { out = append(out, string(cur)) } return out } func init() { StringType.Dict["endswith"] = MustNewMethod("endswith", func(self Object, args Tuple) (Object, error) { selfStr := string(self.(String)) suffix := []string{} if len(args) > 0 { if s, ok := args[0].(String); ok { suffix = append(suffix, string(s)) } else if s, ok := args[0].(Tuple); ok { for _, t := range s { if v, ok := t.(String); ok { suffix = append(suffix, string(v)) } } } else { return nil, ExceptionNewf(TypeError, "endswith first arg must be str, unicode, or tuple, not %s", args[0].Type()) } } else { return nil, ExceptionNewf(TypeError, "endswith() takes at least 1 argument (0 given)") } for _, s := range suffix { if strings.HasSuffix(selfStr, s) { return Bool(true), nil } } return Bool(false), nil }, 0, "endswith(suffix[, start[, end]]) -> bool") StringType.Dict["count"] = MustNewMethod("count", func(self Object, args Tuple) (Object, error) { return self.(String).Count(args) }, 0, `count(sub[, start[, end]]) -> int Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation.`) StringType.Dict["find"] = MustNewMethod("find", func(self Object, args Tuple) (Object, error) { return self.(String).find(args) }, 0, `find(...) S.find(sub[, start[, end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure.`) StringType.Dict["replace"] = MustNewMethod("replace", func(self Object, args Tuple) (Object, error) { return self.(String).Replace(args) }, 0, `replace(self, old, new, count=-1) -> return a copy with all occurrences of substring old replaced by new. count Maximum number of occurrences to replace. -1 (the default value) means replace all occurrences. If the optional argument count is given, only the first count occurrences are replaced.`) StringType.Dict["split"] = MustNewMethod("split", func(self Object, args Tuple, kwargs StringDict) (Object, error) { return self.(String).Split(args, kwargs) }, 0, "split(sub) -> split string with sub.") StringType.Dict["startswith"] = MustNewMethod("startswith", func(self Object, args Tuple) (Object, error) { selfStr := string(self.(String)) prefix := []string{} if len(args) > 0 { if s, ok := args[0].(String); ok { prefix = append(prefix, string(s)) } else if s, ok := args[0].(Tuple); ok { for _, t := range s { if v, ok := t.(String); ok { prefix = append(prefix, string(v)) } } } else { return nil, ExceptionNewf(TypeError, "startswith first arg must be str, unicode, or tuple, not %s", args[0].Type()) } } else { return nil, ExceptionNewf(TypeError, "startswith() takes at least 1 argument (0 given)") } if len(args) > 1 { if s, ok := args[1].(Int); ok { selfStr = selfStr[s:] } } for _, s := range prefix { if strings.HasPrefix(selfStr, s) { return Bool(true), nil } } return Bool(false), nil }, 0, "startswith(prefix[, start[, end]]) -> bool") StringType.Dict["strip"] = MustNewMethod("strip", func(self Object, args Tuple, kwargs StringDict) (Object, error) { return self.(String).Strip(args) }, 0, "strip(chars) -> replace chars from begining and end of string") StringType.Dict["rstrip"] = MustNewMethod("rstrip", func(self Object, args Tuple, kwargs StringDict) (Object, error) { return self.(String).RStrip(args) }, 0, "rstrip(chars) -> replace chars from end of string") StringType.Dict["lstrip"] = MustNewMethod("lstrip", func(self Object, args Tuple, kwargs StringDict) (Object, error) { return self.(String).LStrip(args) }, 0, "lstrip(chars) -> replace chars from begining of string") StringType.Dict["upper"] = MustNewMethod("upper", func(self Object, args Tuple, kwargs StringDict) (Object, error) { return self.(String).Upper() }, 0, "upper() -> a copy of the string converted to uppercase") StringType.Dict["lower"] = MustNewMethod("lower", func(self Object, args Tuple, kwargs StringDict) (Object, error) { return self.(String).Lower() }, 0, "lower() -> a copy of the string converted to lowercase") StringType.Dict["join"] = MustNewMethod("join", func(self Object, args Tuple) (Object, error) { return self.(String).Join(args) }, 0, "join(iterable) -> return a string which is the concatenation of the strings in iterable") } // Type of this object func (s String) Type() *Type { return StringType } // StrNew func StrNew(metatype *Type, args Tuple, kwargs StringDict) (Object, error) { var ( sObj Object = String("") encoding Object errors Object ) // FIXME ignoring encoding and errors err := ParseTupleAndKeywords(args, kwargs, "|OOO:str", []string{"bytes_or_buffer", "encoding", "errors"}, &sObj, &encoding, &errors) if err != nil { return nil, err } // FIXME ignoring encoding // FIXME ignoring buffer protocol return Str(sObj) } // Intern s possibly returning a reference to an already interned string func (s String) Intern() String { // fmt.Printf("FIXME interning %q\n", s) return s } func (a String) M__str__() (Object, error) { return a, nil } func (a String) M__repr__() (Object, error) { out := StringEscape(a, false) return String(out), nil } func (s String) M__bool__() (Object, error) { return NewBool(len(s) > 0), nil } // len returns length of the string in unicode characters func (s String) len() int { return utf8.RuneCountInString(string(s)) } func (s String) M__len__() (Object, error) { return Int(s.len()), nil } func (a String) M__add__(other Object) (Object, error) { if b, ok := other.(String); ok { return a + b, nil } return NotImplemented, nil } func (a String) M__radd__(other Object) (Object, error) { if b, ok := other.(String); ok { return b + a, nil } return NotImplemented, nil } func (a String) M__iadd__(other Object) (Object, error) { return a.M__add__(other) } func (a String) M__mul__(other Object) (Object, error) { if b, ok := convertToInt(other); ok { if b < 0 { b = 0 } var out bytes.Buffer for i := 0; i < int(b); i++ { out.WriteString(string(a)) } return String(out.String()), nil } return NotImplemented, nil } func (a String) M__rmul__(other Object) (Object, error) { return a.M__mul__(other) } func (a String) M__imul__(other Object) (Object, error) { return a.M__mul__(other) } // Convert an Object to an String // // Returns ok as to whether the conversion worked or not func convertToString(other Object) (String, bool) { switch b := other.(type) { case String: return b, true } return "", false } // Rich comparison func (a String) M__lt__(other Object) (Object, error) { if b, ok := convertToString(other); ok { return NewBool(a < b), nil } return NotImplemented, nil } func (a String) M__le__(other Object) (Object, error) { if b, ok := convertToString(other); ok { return NewBool(a <= b), nil } return NotImplemented, nil } func (a String) M__eq__(other Object) (Object, error) { if b, ok := convertToString(other); ok { return NewBool(a == b), nil } return NotImplemented, nil } func (a String) M__ne__(other Object) (Object, error) { if b, ok := convertToString(other); ok { return NewBool(a != b), nil } return NotImplemented, nil } func (a String) M__gt__(other Object) (Object, error) { if b, ok := convertToString(other); ok { return NewBool(a > b), nil } return NotImplemented, nil } func (a String) M__ge__(other Object) (Object, error) { if b, ok := convertToString(other); ok { return NewBool(a >= b), nil } return NotImplemented, nil } // % operator /* 4.7.2. printf-style String Formatting Note The formatting operations described here exhibit a variety of quirks that lead to a number of common errors (such as failing to display tuples and dictionaries correctly). Using the newer str.format() interface helps avoid these errors, and also provides a generally more powerful, flexible and extensible approach to formatting text. String objects have one unique built-in operation: the % operator (modulo). This is also known as the string formatting or interpolation operator. Given format % values (where format is a string), % conversion specifications in format are replaced with zero or more elements of values. The effect is similar to using the sprintf() in the C language. If format requires a single argument, values may be a single non-tuple object. [5] Otherwise, values must be a tuple with exactly the number of items specified by the format string, or a single mapping object (for example, a dictionary). A conversion specifier contains two or more characters and has the following components, which must occur in this order: The '%' character, which marks the start of the specifier. Mapping key (optional), consisting of a parenthesised sequence of characters (for example, (somename)). Conversion flags (optional), which affect the result of some conversion types. Minimum field width (optional). If specified as an '*' (asterisk), the actual width is read from the next element of the tuple in values, and the object to convert comes after the minimum field width and optional precision. Precision (optional), given as a '.' (dot) followed by the precision. If specified as '*' (an asterisk), the actual precision is read from the next element of the tuple in values, and the value to convert comes after the precision. Length modifier (optional). Conversion type. When the right argument is a dictionary (or other mapping type), then the formats in the string must include a parenthesised mapping key into that dictionary inserted immediately after the '%' character. The mapping key selects the value to be formatted from the mapping. For example: >>> >>> print('%(language)s has %(number)03d quote types.' % ... {'language': "Python", "number": 2}) Python has 002 quote types. In this case no * specifiers may occur in a format (since they require a sequential parameter list). The conversion flag characters are: Flag Meaning '#' The value conversion will use the “alternate form” (where defined below). '0' The conversion will be zero padded for numeric values. '-' The converted value is left adjusted (overrides the '0' conversion if both are given). ' ' (a space) A blank should be left before a positive number (or empty string) produced by a signed conversion. '+' A sign character ('+' or '-') will precede the conversion (overrides a “space” flag). A length modifier (h, l, or L) may be present, but is ignored as it is not necessary for Python – so e.g. %ld is identical to %d. The conversion types are: Conversion Meaning Notes 'd' Signed integer decimal. 'i' Signed integer decimal. 'o' Signed octal value. (1) 'u' Obsolete type – it is identical to 'd'. (7) 'x' Signed hexadecimal (lowercase). (2) 'X' Signed hexadecimal (uppercase). (2) 'e' Floating point exponential format (lowercase). (3) 'E' Floating point exponential format (uppercase). (3) 'f' Floating point decimal format. (3) 'F' Floating point decimal format. (3) 'g' Floating point format. Uses lowercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise. (4) 'G' Floating point format. Uses uppercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise. (4) 'c' Single character (accepts integer or single character string). 'r' String (converts any Python object using repr()). (5) 's' String (converts any Python object using str()). (5) 'a' String (converts any Python object using ascii()). (5) '%' No argument is converted, results in a '%' character in the result. Notes: The alternate form causes a leading zero ('0') to be inserted between left-hand padding and the formatting of the number if the leading character of the result is not already a zero. The alternate form causes a leading '0x' or '0X' (depending on whether the 'x' or 'X' format was used) to be inserted between left-hand padding and the formatting of the number if the leading character of the result is not already a zero. The alternate form causes the result to always contain a decimal point, even if no digits follow it. The precision determines the number of digits after the decimal point and defaults to 6. The alternate form causes the result to always contain a decimal point, and trailing zeroes are not removed as they would otherwise be. The precision determines the number of significant digits before and after the decimal point and defaults to 6. If precision is N, the output is truncated to N characters. See PEP 237. Since Python strings have an explicit length, %s conversions do not assume that '\0' is the end of the string. Changed in version 3.1: %f conversions for numbers whose absolute value is over 1e50 are no longer replaced by %g conversions. */ func (a String) M__mod__(other Object) (Object, error) { var values Tuple switch b := other.(type) { case Tuple: values = b default: values = Tuple{other} } // FIXME not a full implementation ;-) params := make([]interface{}, len(values)) for i := range values { params[i] = values[i] } s := string(a) s = strings.Replace(s, "%s", "%v", -1) s = strings.Replace(s, "%r", "%#v", -1) return String(fmt.Sprintf(s, params...)), nil } func (a String) M__rmod__(other Object) (Object, error) { switch b := other.(type) { case String: return b.M__mod__(a) } return NotImplemented, nil } func (a String) M__imod__(other Object) (Object, error) { return a.M__mod__(other) } // Returns position in string of n-th character // // returns end of string if not found func (s String) pos(n int) int { characterNumber := 0 for i := range s { if characterNumber == n { return i } characterNumber++ } return len(s) } // slice returns the slice of this string using character positions // // length should be the length of the string in unicode characters func (s String) slice(start, stop, length int) String { if start >= stop { return String("") } if length == len(s) { return s[start:stop] // ascii only } if start <= 0 && stop >= length { return s } startI := s.pos(start) stopI := s[startI:].pos(stop-start) + startI return s[startI:stopI] } func (s String) M__getitem__(key Object) (Object, error) { length := s.len() asciiOnly := length == len(s) if slice, ok := key.(*Slice); ok { start, stop, step, slicelength, err := slice.GetIndices(length) if err != nil { return nil, err } if step == 1 { // Return a subslice since strings are immutable return s.slice(start, stop, length), nil } if asciiOnly { newString := make([]byte, slicelength) for i, j := start, 0; j < slicelength; i, j = i+step, j+1 { newString[j] = s[i] } return String(newString), nil } // Unpack the string into a []rune to do this for speed runeString := []rune(string(s)) newString := make([]rune, slicelength) for i, j := start, 0; j < slicelength; i, j = i+step, j+1 { newString[j] = runeString[i] } return String(newString), nil } i, err := IndexIntCheck(key, length) if err != nil { return nil, err } if asciiOnly { return s[i : i+1], nil } s = s[s.pos(i):] _, runeSize := utf8.DecodeRuneInString(string(s)) return s[:runeSize], nil } func (s String) M__contains__(item Object) (Object, error) { needle, ok := item.(String) if !ok { return nil, ExceptionNewf(TypeError, "'in <string>' requires string as left operand, not %s", item.Type().Name) } return NewBool(strings.Contains(string(s), string(needle))), nil } func (s String) Count(args Tuple) (Object, error) { var ( pysub Object pybeg Object = Int(0) pyend Object = Int(s.len()) pyfmt = "s|ii:count" ) err := ParseTuple(args, pyfmt, &pysub, &pybeg, &pyend) if err != nil { return nil, err } var ( beg = int(pybeg.(Int)) end = int(pyend.(Int)) size = s.len() ) if beg > size { beg = size } if end < 0 { end = size } if end > size { end = size } var ( str = string(s.slice(beg, end, s.len())) sub = string(pysub.(String)) ) return Int(strings.Count(str, sub)), nil } func (s String) find(args Tuple) (Object, error) { var ( pysub Object pybeg Object = Int(0) pyend Object = Int(s.len()) pyfmt = "s|ii:find" ) err := ParseTuple(args, pyfmt, &pysub, &pybeg, &pyend) if err != nil { return nil, err } var ( beg = int(pybeg.(Int)) end = int(pyend.(Int)) size = s.len() ) if beg > size { beg = size } if end < 0 { end = size } if end > size { end = size } var ( off = s.slice(0, beg, s.len()).len() str = string(s.slice(beg, end, s.len())) sub = string(pysub.(String)) idx = strings.Index(str, sub) ) if idx < 0 { return Int(idx), nil } return Int(off + String(str[:idx]).len()), nil } func (s String) Split(args Tuple, kwargs StringDict) (Object, error) { var ( pyval Object = None pymax Object = Int(-2) pyfmt = "|Oi:split" kwlst = []string{"sep", "maxsplit"} ) err := ParseTupleAndKeywords(args, kwargs, pyfmt, kwlst, &pyval, &pymax) if err != nil { return nil, err } var ( max = pymax.(Int) vs []string ) switch v := pyval.(type) { case String: vs = strings.SplitN(string(s), string(v), int(max)+1) case NoneType: vs = fieldsN(string(s), int(max)) default: return nil, ExceptionNewf(TypeError, "Can't convert '%s' object to str implicitly", pyval.Type()) } o := List{} for _, j := range vs { o.Items = append(o.Items, String(j)) } return &o, nil } func (s String) Replace(args Tuple) (Object, error) { var ( pyold Object = None pynew Object = None pycnt Object = Int(-1) ) err := ParseTuple(args, "ss|i:replace", &pyold, &pynew, &pycnt) if err != nil { return nil, err } var ( old = string(pyold.(String)) new = string(pynew.(String)) cnt = int(pycnt.(Int)) ) return String(strings.Replace(string(s), old, new, cnt)), nil } func stripFunc(args Tuple) (func(rune) bool, error) { var ( pyval Object = None ) err := ParseTuple(args, "|s", &pyval) if err != nil { return nil, err } f := unicode.IsSpace switch v := pyval.(type) { case String: chars := []rune(string(v)) f = func(s rune) bool { for _, i := range chars { if s == i { return true } } return false } } return f, nil } func (s String) Strip(args Tuple) (Object, error) { f, err := stripFunc(args) if err != nil { return nil, err } return String(strings.TrimFunc(string(s), f)), nil } func (s String) LStrip(args Tuple) (Object, error) { f, err := stripFunc(args) if err != nil { return nil, err } return String(strings.TrimLeftFunc(string(s), f)), nil } func (s String) RStrip(args Tuple) (Object, error) { f, err := stripFunc(args) if err != nil { return nil, err } return String(strings.TrimRightFunc(string(s), f)), nil } func (s String) Upper() (Object, error) { return String(strings.ToUpper(string(s))), nil } func (s String) Lower() (Object, error) { return String(strings.ToLower(string(s))), nil } func (s String) Join(args Tuple) (Object, error) { if len(args) != 1 { return nil, ExceptionNewf(TypeError, "join() takes exactly one argument (%d given)", len(args)) } var parts []string iterable, err := Iter(args[0]) if err != nil { return nil, err } item, err := Next(iterable) for err == nil { str, ok := item.(String) if !ok { return nil, ExceptionNewf(TypeError, "sequence item %d: expected str instance, %s found", len(parts), item.Type().Name) } parts = append(parts, string(str)) item, err = Next(iterable) } if err != StopIteration { return nil, err } return String(strings.Join(parts, string(s))), nil } // Check stringerface is satisfied var ( _ richComparison = String("") _ sequenceArithmetic = String("") _ I__mod__ = String("") _ I__rmod__ = String("") _ I__imod__ = String("") _ I__len__ = String("") _ I__bool__ = String("") _ I__getitem__ = String("") _ I__contains__ = String("") ) |
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