intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 505 insertions, 0 deletions

diff --git a/contrib/libs/llvm12/include/llvm/ADT/StringExtras.h b/contrib/libs/llvm12/include/llvm/ADT/StringExtras.h
new file mode 100644
index 0000000000..1ddaf13978
--- /dev/null
+++ b/contrib/libs/llvm12/include/llvm/ADT/StringExtras.h
@@ -0,0 +1,505 @@
+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//===- llvm/ADT/StringExtras.h - Useful string functions --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains some functions that are useful when dealing with strings.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_STRINGEXTRAS_H
+#define LLVM_ADT_STRINGEXTRAS_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <iterator>
+#include <string>
+#include <utility>
+
+namespace llvm {
+
+template<typename T> class SmallVectorImpl;
+class raw_ostream;
+
+/// hexdigit - Return the hexadecimal character for the
+/// given number \p X (which should be less than 16).
+inline char hexdigit(unsigned X, bool LowerCase = false) {
+  const char HexChar = LowerCase ? 'a' : 'A';
+  return X < 10 ? '0' + X : HexChar + X - 10;
+}
+
+/// Given an array of c-style strings terminated by a null pointer, construct
+/// a vector of StringRefs representing the same strings without the terminating
+/// null string.
+inline std::vector<StringRef> toStringRefArray(const char *const *Strings) {
+  std::vector<StringRef> Result;
+  while (*Strings)
+    Result.push_back(*Strings++);
+  return Result;
+}
+
+/// Construct a string ref from a boolean.
+inline StringRef toStringRef(bool B) { return StringRef(B ? "true" : "false"); }
+
+/// Construct a string ref from an array ref of unsigned chars.
+inline StringRef toStringRef(ArrayRef<uint8_t> Input) {
+  return StringRef(reinterpret_cast<const char *>(Input.begin()), Input.size());
+}
+
+/// Construct a string ref from an array ref of unsigned chars.
+inline ArrayRef<uint8_t> arrayRefFromStringRef(StringRef Input) {
+  return {Input.bytes_begin(), Input.bytes_end()};
+}
+
+/// Interpret the given character \p C as a hexadecimal digit and return its
+/// value.
+///
+/// If \p C is not a valid hex digit, -1U is returned.
+inline unsigned hexDigitValue(char C) {
+  struct HexTable {
+    unsigned LUT[255] = {};
+    constexpr HexTable() {
+      // Default initialize everything to invalid.
+      for (int i = 0; i < 255; ++i)
+        LUT[i] = ~0U;
+      // Initialize `0`-`9`.
+      for (int i = 0; i < 10; ++i)
+        LUT['0' + i] = i;
+      // Initialize `A`-`F` and `a`-`f`.
+      for (int i = 0; i < 6; ++i)
+        LUT['A' + i] = LUT['a' + i] = 10 + i;
+    }
+  };
+  constexpr HexTable Table;
+  return Table.LUT[static_cast<unsigned char>(C)];
+}
+
+/// Checks if character \p C is one of the 10 decimal digits.
+inline bool isDigit(char C) { return C >= '0' && C <= '9'; }
+
+/// Checks if character \p C is a hexadecimal numeric character.
+inline bool isHexDigit(char C) { return hexDigitValue(C) != ~0U; }
+
+/// Checks if character \p C is a valid letter as classified by "C" locale.
+inline bool isAlpha(char C) {
+  return ('a' <= C && C <= 'z') || ('A' <= C && C <= 'Z');
+}
+
+/// Checks whether character \p C is either a decimal digit or an uppercase or
+/// lowercase letter as classified by "C" locale.
+inline bool isAlnum(char C) { return isAlpha(C) || isDigit(C); }
+
+/// Checks whether character \p C is valid ASCII (high bit is zero).
+inline bool isASCII(char C) { return static_cast<unsigned char>(C) <= 127; }
+
+/// Checks whether all characters in S are ASCII.
+inline bool isASCII(llvm::StringRef S) {
+  for (char C : S)
+    if (LLVM_UNLIKELY(!isASCII(C)))
+      return false;
+  return true;
+}
+
+/// Checks whether character \p C is printable.
+///
+/// Locale-independent version of the C standard library isprint whose results
+/// may differ on different platforms.
+inline bool isPrint(char C) {
+  unsigned char UC = static_cast<unsigned char>(C);
+  return (0x20 <= UC) && (UC <= 0x7E);
+}
+
+/// Checks whether character \p C is whitespace in the "C" locale.
+///
+/// Locale-independent version of the C standard library isspace.
+inline bool isSpace(char C) {
+  return C == ' ' || C == '\f' || C == '\n' || C == '\r' || C == '\t' ||
+         C == '\v';
+}
+
+/// Returns the corresponding lowercase character if \p x is uppercase.
+inline char toLower(char x) {
+  if (x >= 'A' && x <= 'Z')
+    return x - 'A' + 'a';
+  return x;
+}
+
+/// Returns the corresponding uppercase character if \p x is lowercase.
+inline char toUpper(char x) {
+  if (x >= 'a' && x <= 'z')
+    return x - 'a' + 'A';
+  return x;
+}
+
+inline std::string utohexstr(uint64_t X, bool LowerCase = false) {
+  char Buffer[17];
+  char *BufPtr = std::end(Buffer);
+
+  if (X == 0) *--BufPtr = '0';
+
+  while (X) {
+    unsigned char Mod = static_cast<unsigned char>(X) & 15;
+    *--BufPtr = hexdigit(Mod, LowerCase);
+    X >>= 4;
+  }
+
+  return std::string(BufPtr, std::end(Buffer));
+}
+
+/// Convert buffer \p Input to its hexadecimal representation.
+/// The returned string is double the size of \p Input.
+inline std::string toHex(StringRef Input, bool LowerCase = false) {
+  static const char *const LUT = "0123456789ABCDEF";
+  const uint8_t Offset = LowerCase ? 32 : 0;
+  size_t Length = Input.size();
+
+  std::string Output;
+  Output.reserve(2 * Length);
+  for (size_t i = 0; i < Length; ++i) {
+    const unsigned char c = Input[i];
+    Output.push_back(LUT[c >> 4] | Offset);
+    Output.push_back(LUT[c & 15] | Offset);
+  }
+  return Output;
+}
+
+inline std::string toHex(ArrayRef<uint8_t> Input, bool LowerCase = false) {
+  return toHex(toStringRef(Input), LowerCase);
+}
+
+/// Store the binary representation of the two provided values, \p MSB and
+/// \p LSB, that make up the nibbles of a hexadecimal digit. If \p MSB or \p LSB
+/// do not correspond to proper nibbles of a hexadecimal digit, this method
+/// returns false. Otherwise, returns true.
+inline bool tryGetHexFromNibbles(char MSB, char LSB, uint8_t &Hex) {
+  unsigned U1 = hexDigitValue(MSB);
+  unsigned U2 = hexDigitValue(LSB);
+  if (U1 == ~0U || U2 == ~0U)
+    return false;
+
+  Hex = static_cast<uint8_t>((U1 << 4) | U2);
+  return true;
+}
+
+/// Return the binary representation of the two provided values, \p MSB and
+/// \p LSB, that make up the nibbles of a hexadecimal digit.
+inline uint8_t hexFromNibbles(char MSB, char LSB) {
+  uint8_t Hex = 0;
+  bool GotHex = tryGetHexFromNibbles(MSB, LSB, Hex);
+  (void)GotHex;
+  assert(GotHex && "MSB and/or LSB do not correspond to hex digits");
+  return Hex;
+}
+
+/// Convert hexadecimal string \p Input to its binary representation and store
+/// the result in \p Output. Returns true if the binary representation could be
+/// converted from the hexadecimal string. Returns false if \p Input contains
+/// non-hexadecimal digits. The output string is half the size of \p Input.
+inline bool tryGetFromHex(StringRef Input, std::string &Output) {
+  if (Input.empty())
+    return true;
+
+  Output.reserve((Input.size() + 1) / 2);
+  if (Input.size() % 2 == 1) {
+    uint8_t Hex = 0;
+    if (!tryGetHexFromNibbles('0', Input.front(), Hex))
+      return false;
+
+    Output.push_back(Hex);
+    Input = Input.drop_front();
+  }
+
+  assert(Input.size() % 2 == 0);
+  while (!Input.empty()) {
+    uint8_t Hex = 0;
+    if (!tryGetHexFromNibbles(Input[0], Input[1], Hex))
+      return false;
+
+    Output.push_back(Hex);
+    Input = Input.drop_front(2);
+  }
+  return true;
+}
+
+/// Convert hexadecimal string \p Input to its binary representation.
+/// The return string is half the size of \p Input.
+inline std::string fromHex(StringRef Input) {
+  std::string Hex;
+  bool GotHex = tryGetFromHex(Input, Hex);
+  (void)GotHex;
+  assert(GotHex && "Input contains non hex digits");
+  return Hex;
+}
+
+/// Convert the string \p S to an integer of the specified type using
+/// the radix \p Base.  If \p Base is 0, auto-detects the radix.
+/// Returns true if the number was successfully converted, false otherwise.
+template <typename N> bool to_integer(StringRef S, N &Num, unsigned Base = 0) {
+  return !S.getAsInteger(Base, Num);
+}
+
+namespace detail {
+template <typename N>
+inline bool to_float(const Twine &T, N &Num, N (*StrTo)(const char *, char **)) {
+  SmallString<32> Storage;
+  StringRef S = T.toNullTerminatedStringRef(Storage);
+  char *End;
+  N Temp = StrTo(S.data(), &End);
+  if (*End != '\0')
+    return false;
+  Num = Temp;
+  return true;
+}
+}
+
+inline bool to_float(const Twine &T, float &Num) {
+  return detail::to_float(T, Num, strtof);
+}
+
+inline bool to_float(const Twine &T, double &Num) {
+  return detail::to_float(T, Num, strtod);
+}
+
+inline bool to_float(const Twine &T, long double &Num) {
+  return detail::to_float(T, Num, strtold);
+}
+
+inline std::string utostr(uint64_t X, bool isNeg = false) {
+  char Buffer[21];
+  char *BufPtr = std::end(Buffer);
+
+  if (X == 0) *--BufPtr = '0';  // Handle special case...
+
+  while (X) {
+    *--BufPtr = '0' + char(X % 10);
+    X /= 10;
+  }
+
+  if (isNeg) *--BufPtr = '-';   // Add negative sign...
+  return std::string(BufPtr, std::end(Buffer));
+}
+
+inline std::string itostr(int64_t X) {
+  if (X < 0)
+    return utostr(static_cast<uint64_t>(1) + ~static_cast<uint64_t>(X), true);
+  else
+    return utostr(static_cast<uint64_t>(X));
+}
+
+/// StrInStrNoCase - Portable version of strcasestr.  Locates the first
+/// occurrence of string 's1' in string 's2', ignoring case.  Returns
+/// the offset of s2 in s1 or npos if s2 cannot be found.
+StringRef::size_type StrInStrNoCase(StringRef s1, StringRef s2);
+
+/// getToken - This function extracts one token from source, ignoring any
+/// leading characters that appear in the Delimiters string, and ending the
+/// token at any of the characters that appear in the Delimiters string.  If
+/// there are no tokens in the source string, an empty string is returned.
+/// The function returns a pair containing the extracted token and the
+/// remaining tail string.
+std::pair<StringRef, StringRef> getToken(StringRef Source,
+                                         StringRef Delimiters = " \t\n\v\f\r");
+
+/// SplitString - Split up the specified string according to the specified
+/// delimiters, appending the result fragments to the output list.
+void SplitString(StringRef Source,
+                 SmallVectorImpl<StringRef> &OutFragments,
+                 StringRef Delimiters = " \t\n\v\f\r");
+
+/// Returns the English suffix for an ordinal integer (-st, -nd, -rd, -th).
+inline StringRef getOrdinalSuffix(unsigned Val) {
+  // It is critically important that we do this perfectly for
+  // user-written sequences with over 100 elements.
+  switch (Val % 100) {
+  case 11:
+  case 12:
+  case 13:
+    return "th";
+  default:
+    switch (Val % 10) {
+      case 1: return "st";
+      case 2: return "nd";
+      case 3: return "rd";
+      default: return "th";
+    }
+  }
+}
+
+/// Print each character of the specified string, escaping it if it is not
+/// printable or if it is an escape char.
+void printEscapedString(StringRef Name, raw_ostream &Out);
+
+/// Print each character of the specified string, escaping HTML special
+/// characters.
+void printHTMLEscaped(StringRef String, raw_ostream &Out);
+
+/// printLowerCase - Print each character as lowercase if it is uppercase.
+void printLowerCase(StringRef String, raw_ostream &Out);
+
+/// Converts a string from camel-case to snake-case by replacing all uppercase
+/// letters with '_' followed by the letter in lowercase, except if the
+/// uppercase letter is the first character of the string.
+std::string convertToSnakeFromCamelCase(StringRef input);
+
+/// Converts a string from snake-case to camel-case by replacing all occurrences
+/// of '_' followed by a lowercase letter with the letter in uppercase.
+/// Optionally allow capitalization of the first letter (if it is a lowercase
+/// letter)
+std::string convertToCamelFromSnakeCase(StringRef input,
+                                        bool capitalizeFirst = false);
+
+namespace detail {
+
+template <typename IteratorT>
+inline std::string join_impl(IteratorT Begin, IteratorT End,
+                             StringRef Separator, std::input_iterator_tag) {
+  std::string S;
+  if (Begin == End)
+    return S;
+
+  S += (*Begin);
+  while (++Begin != End) {
+    S += Separator;
+    S += (*Begin);
+  }
+  return S;
+}
+
+template <typename IteratorT>
+inline std::string join_impl(IteratorT Begin, IteratorT End,
+                             StringRef Separator, std::forward_iterator_tag) {
+  std::string S;
+  if (Begin == End)
+    return S;
+
+  size_t Len = (std::distance(Begin, End) - 1) * Separator.size();
+  for (IteratorT I = Begin; I != End; ++I)
+    Len += (*I).size();
+  S.reserve(Len);
+  size_t PrevCapacity = S.capacity();
+  (void)PrevCapacity;
+  S += (*Begin);
+  while (++Begin != End) {
+    S += Separator;
+    S += (*Begin);
+  }
+  assert(PrevCapacity == S.capacity() && "String grew during building");
+  return S;
+}
+
+template <typename Sep>
+inline void join_items_impl(std::string &Result, Sep Separator) {}
+
+template <typename Sep, typename Arg>
+inline void join_items_impl(std::string &Result, Sep Separator,
+                            const Arg &Item) {
+  Result += Item;
+}
+
+template <typename Sep, typename Arg1, typename... Args>
+inline void join_items_impl(std::string &Result, Sep Separator, const Arg1 &A1,
+                            Args &&... Items) {
+  Result += A1;
+  Result += Separator;
+  join_items_impl(Result, Separator, std::forward<Args>(Items)...);
+}
+
+inline size_t join_one_item_size(char) { return 1; }
+inline size_t join_one_item_size(const char *S) { return S ? ::strlen(S) : 0; }
+
+template <typename T> inline size_t join_one_item_size(const T &Str) {
+  return Str.size();
+}
+
+inline size_t join_items_size() { return 0; }
+
+template <typename A1> inline size_t join_items_size(const A1 &A) {
+  return join_one_item_size(A);
+}
+template <typename A1, typename... Args>
+inline size_t join_items_size(const A1 &A, Args &&... Items) {
+  return join_one_item_size(A) + join_items_size(std::forward<Args>(Items)...);
+}
+
+} // end namespace detail
+
+/// Joins the strings in the range [Begin, End), adding Separator between
+/// the elements.
+template <typename IteratorT>
+inline std::string join(IteratorT Begin, IteratorT End, StringRef Separator) {
+  using tag = typename std::iterator_traits<IteratorT>::iterator_category;
+  return detail::join_impl(Begin, End, Separator, tag());
+}
+
+/// Joins the strings in the range [R.begin(), R.end()), adding Separator
+/// between the elements.
+template <typename Range>
+inline std::string join(Range &&R, StringRef Separator) {
+  return join(R.begin(), R.end(), Separator);
+}
+
+/// Joins the strings in the parameter pack \p Items, adding \p Separator
+/// between the elements.  All arguments must be implicitly convertible to
+/// std::string, or there should be an overload of std::string::operator+=()
+/// that accepts the argument explicitly.
+template <typename Sep, typename... Args>
+inline std::string join_items(Sep Separator, Args &&... Items) {
+  std::string Result;
+  if (sizeof...(Items) == 0)
+    return Result;
+
+  size_t NS = detail::join_one_item_size(Separator);
+  size_t NI = detail::join_items_size(std::forward<Args>(Items)...);
+  Result.reserve(NI + (sizeof...(Items) - 1) * NS + 1);
+  detail::join_items_impl(Result, Separator, std::forward<Args>(Items)...);
+  return Result;
+}
+
+/// A helper class to return the specified delimiter string after the first
+/// invocation of operator StringRef().  Used to generate a comma-separated
+/// list from a loop like so:
+///
+/// \code
+///   ListSeparator LS;
+///   for (auto &I : C)
+///     OS << LS << I.getName();
+/// \end
+class ListSeparator {
+  bool First = true;
+  StringRef Separator;
+
+public:
+  ListSeparator(StringRef Separator = ", ") : Separator(Separator) {}
+  operator StringRef() {
+    if (First) {
+      First = false;
+      return {};
+    }
+    return Separator;
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_ADT_STRINGEXTRAS_H
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif