YugabyteDB (2.13.1.0-b60, 21121d69985fbf76aa6958d8f04a9bfa936293b5)

// Copyright 2008 and onwards Google, Inc.

//

// #status: RECOMMENDED

// #category: operations on strings

// #summary: Merges strings or numbers with no delimiter.

//

// The following only applies to changes made to this file as part of YugaByte development.

//

// Portions Copyright (c) YugaByte, Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except

// in compliance with the License.  You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software distributed under the License

// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

// or implied.  See the License for the specific language governing permissions and limitations

// under the License.

//

#ifndef YB_GUTIL_STRINGS_STRCAT_H

#define YB_GUTIL_STRINGS_STRCAT_H

#include <string>

using std::string;

#include "yb/gutil/integral_types.h"

#include "yb/gutil/strings/numbers.h"

#include "yb/gutil/strings/stringpiece.h"

// The AlphaNum type was designed to be used as the parameter type for StrCat().

// I suppose that any routine accepting either a string or a number could accept

// it.  The basic idea is that by accepting a "const AlphaNum &" as an argument

// to your function, your callers will automagically convert bools, integers,

// and floating point values to strings for you.

//

// Conversion from 8-bit values is not accepted because if it were, then an

// attempt to pass ':' instead of ":" might result in a 58 ending up in your

// result.

//

// Bools convert to "0" or "1".

//

// Floating point values are converted to a string which, if passed to strtod(),

// would produce the exact same original double (except in case of NaN; all NaNs

// are considered the same value). We try to keep the string short but it's not

// guaranteed to be as short as possible.

//

// This class has implicit constructors.

// Style guide exception granted:

// http://goto/style-guide-exception-20978288

//

struct AlphaNum {

  GStringPiece piece;

  char digits[kFastToBufferSize];

  // No bool ctor -- bools convert to an integral type.

  // A bool ctor would also convert incoming pointers (bletch).

  // It is OK that digits is not initialized.

  //-V:digits:730

  AlphaNum(int32 i32)  // NOLINT(runtime/explicit)

      : piece(digits, FastInt32ToBufferLeft(i32, digits) - &digits[0]) {}

  //-V:digits_:730

  AlphaNum(uint32 u32)  // NOLINT(runtime/explicit)

      : piece(digits, FastUInt32ToBufferLeft(u32, digits) - &digits[0]) {}

  //-V:digits_:730

  AlphaNum(int64 i64)  // NOLINT(runtime/explicit)

      : piece(digits, FastInt64ToBufferLeft(i64, digits) - &digits[0]) {}

  //-V:digits_:730

  AlphaNum(uint64 u64)  // NOLINT(runtime/explicit)

      : piece(digits, FastUInt64ToBufferLeft(u64, digits) - &digits[0]) {}

#if defined(__APPLE__)

  //-V:digits_:730

  AlphaNum(size_t size)  // NOLINT(runtime/explicit)

      : piece(digits, FastUInt64ToBufferLeft(size, digits) - &digits[0]) {}

#endif

  //-V:digits_:730

  AlphaNum(float f)  // NOLINT(runtime/explicit)

      : piece(digits, strlen(FloatToBuffer(f, digits))) {}

  //-V:digits_:730

  AlphaNum(double f)  // NOLINT(runtime/explicit)

      : piece(digits, strlen(DoubleToBuffer(f, digits))) {}

  //-V:digits_:730

  AlphaNum(const char *c_str) : piece(c_str) {}  // NOLINT(runtime/explicit)

  //-V:digits_:730

  AlphaNum(GStringPiece pc) : piece(std::move(pc)) {}  // NOLINT(runtime/explicit)

  //-V:digits_:730

  AlphaNum(const string &s) : piece(s) {}  // NOLINT(runtime/explicit)

  GStringPiece::size_type size() const { return piece.size(); }

  const char *data() const { return piece.data(); }

 private:

  // Use ":" not ':'

  AlphaNum(char c);  // NOLINT(runtime/explicit)

};

extern AlphaNum gEmptyAlphaNum;

// ----------------------------------------------------------------------

// StrCat()

//    This merges the given strings or numbers, with no delimiter.  This

//    is designed to be the fastest possible way to construct a string out

//    of a mix of raw C strings, GStringPieces, strings, bool values,

//    and numeric values.

//

//    Don't use this for user-visible strings.  The localization process

//    works poorly on strings built up out of fragments.

//

//    For clarity and performance, don't use StrCat when appending to a

//    string.  In particular, avoid using any of these (anti-)patterns:

//      str.append(StrCat(...)

//      str += StrCat(...)

//      str = StrCat(str, ...)

//    where the last is the worse, with the potential to change a loop

//    from a linear time operation with O(1) dynamic allocations into a

//    quadratic time operation with O(n) dynamic allocations.  StrAppend

//    is a better choice than any of the above, subject to the restriction

//    of StrAppend(&str, a, b, c, ...) that none of the a, b, c, ... may

//    be a reference into str.

// ----------------------------------------------------------------------

string StrCat(const AlphaNum &a);

string StrCat(const AlphaNum &a, const AlphaNum &b);

string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c);

string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

              const AlphaNum &d);

string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

              const AlphaNum &d, const AlphaNum &e);

string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

              const AlphaNum &d, const AlphaNum &e, const AlphaNum &f);

string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

              const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

              const AlphaNum &g);

string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

              const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

              const AlphaNum &g, const AlphaNum &h);

namespace strings {

namespace internal {

// Do not call directly - this is not part of the public API.

string StrCatNineOrMore(const AlphaNum *a1, ...);

}  // namespace internal

}  // namespace strings

// Support 9 or more arguments

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t, const AlphaNum &u) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, &u, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t, const AlphaNum &u,

                     const AlphaNum &v) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, &u, &v, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t, const AlphaNum &u,

                     const AlphaNum &v, const AlphaNum &w) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, &u, &v, &w, null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t, const AlphaNum &u,

                     const AlphaNum &v, const AlphaNum &w, const AlphaNum &x) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, &u, &v, &w, &x,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t, const AlphaNum &u,

                     const AlphaNum &v, const AlphaNum &w, const AlphaNum &x,

                     const AlphaNum &y) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, &u, &v, &w, &x, &y,

                                             null_alphanum);

}

inline string StrCat(const AlphaNum &a, const AlphaNum &b, const AlphaNum &c,

                     const AlphaNum &d, const AlphaNum &e, const AlphaNum &f,

                     const AlphaNum &g, const AlphaNum &h, const AlphaNum &i,

                     const AlphaNum &j, const AlphaNum &k, const AlphaNum &l,

                     const AlphaNum &m, const AlphaNum &n, const AlphaNum &o,

                     const AlphaNum &p, const AlphaNum &q, const AlphaNum &r,

                     const AlphaNum &s, const AlphaNum &t, const AlphaNum &u,

                     const AlphaNum &v, const AlphaNum &w, const AlphaNum &x,

                     const AlphaNum &y, const AlphaNum &z) {

  const AlphaNum* null_alphanum = NULL;

  return strings::internal::StrCatNineOrMore(&a, &b, &c, &d, &e, &f, &g, &h, &i,

                                             &j, &k, &l, &m, &n, &o, &p, &q, &r,

                                             &s, &t, &u, &v, &w, &x, &y, &z,

                                             null_alphanum);

}

// ----------------------------------------------------------------------

// StrAppend()

//    Same as above, but adds the output to the given string.

//    WARNING: For speed, StrAppend does not try to check each of its input

//    arguments to be sure that they are not a subset of the string being

//    appended to.  That is, while this will work:

//

//    string s = "foo";

//    s += s;

//

//    This will not (necessarily) work:

//

//    string s = "foo";

//    StrAppend(&s, s);

//

//    Note: while StrCat supports appending up to 12 arguments, StrAppend

//    is currently limited to 9.  That's rarely an issue except when

//    automatically transforming StrCat to StrAppend, and can easily be

//    worked around as consecutive calls to StrAppend are quite efficient.

// ----------------------------------------------------------------------

void StrAppend(string *dest,      const AlphaNum &a);

void StrAppend(string *dest,      const AlphaNum &a, const AlphaNum &b);

void StrAppend(string *dest,      const AlphaNum &a, const AlphaNum &b,

               const AlphaNum &c);

void StrAppend(string *dest,      const AlphaNum &a, const AlphaNum &b,

               const AlphaNum &c, const AlphaNum &d);

// Support up to 9 params by using a default empty AlphaNum.

void StrAppend(string *dest,      const AlphaNum &a, const AlphaNum &b,

               const AlphaNum &c, const AlphaNum &d, const AlphaNum &e,

               const AlphaNum &f = gEmptyAlphaNum,

               const AlphaNum &g = gEmptyAlphaNum,

               const AlphaNum &h = gEmptyAlphaNum,

               const AlphaNum &i = gEmptyAlphaNum);

#endif  // YB_GUTIL_STRINGS_STRCAT_H