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📄 Statistic.h(7.01 KB)
📄 StringExtras.h(13.25 KB)
📄 StringMap.h(15.7 KB)
📄 StringMapEntry.h(4.83 KB)
📄 StringRef.h(31.68 KB)
📄 StringSet.h(1.51 KB)
📄 StringSwitch.h(6.25 KB)
📄 TinyPtrVector.h(10.19 KB)
📄 Triple.h(27.4 KB)
📄 Twine.h(17.48 KB)
📄 TypeSwitch.h(5.82 KB)
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📄 Waymarking.h(11.96 KB)
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📄 edit_distance.h(3.57 KB)
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📄 ilist_node_options.h(5.07 KB)
📄 iterator.h(13.46 KB)
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📄 simple_ilist.h(10.78 KB)

Editing: StringSwitch.h

//===--- StringSwitch.h - Switch-on-literal-string Construct --------------===/
//
// 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 implements the StringSwitch template, which mimics a switch()
//  statement whose cases are string literals.
//
//===----------------------------------------------------------------------===/
#ifndef LLVM_ADT_STRINGSWITCH_H
#define LLVM_ADT_STRINGSWITCH_H

#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Compiler.h"
#include <cassert>
#include <cstring>

namespace llvm {

/// A switch()-like statement whose cases are string literals.
///
/// The StringSwitch class is a simple form of a switch() statement that
/// determines whether the given string matches one of the given string
/// literals. The template type parameter \p T is the type of the value that
/// will be returned from the string-switch expression. For example,
/// the following code switches on the name of a color in \c argv[i]:
///
/// \code
/// Color color = StringSwitch<Color>(argv[i])
///   .Case("red", Red)
///   .Case("orange", Orange)
///   .Case("yellow", Yellow)
///   .Case("green", Green)
///   .Case("blue", Blue)
///   .Case("indigo", Indigo)
///   .Cases("violet", "purple", Violet)
///   .Default(UnknownColor);
/// \endcode
template<typename T, typename R = T>
class StringSwitch {
  /// The string we are matching.
  const StringRef Str;

/// The pointer to the result of this switch statement, once known,
  /// null before that.
  Optional<T> Result;

public:
  explicit StringSwitch(StringRef S)
  : Str(S), Result() { }

// StringSwitch is not copyable.
  StringSwitch(const StringSwitch &) = delete;

// StringSwitch is not assignable due to 'Str' being 'const'.
  void operator=(const StringSwitch &) = delete;
  void operator=(StringSwitch &&other) = delete;

StringSwitch(StringSwitch &&other)
    : Str(other.Str), Result(std::move(other.Result)) { }

~StringSwitch() = default;

// Case-sensitive case matchers
  StringSwitch &Case(StringLiteral S, T Value) {
    if (!Result && Str == S) {
      Result = std::move(Value);
    }
    return *this;
  }

StringSwitch& EndsWith(StringLiteral S, T Value) {
    if (!Result && Str.endswith(S)) {
      Result = std::move(Value);
    }
    return *this;
  }

StringSwitch& StartsWith(StringLiteral S, T Value) {
    if (!Result && Str.startswith(S)) {
      Result = std::move(Value);
    }
    return *this;
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, T Value) {
    return Case(S0, Value).Case(S1, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      T Value) {
    return Case(S0, Value).Cases(S1, S2, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, StringLiteral S4, T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, S4, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, StringLiteral S4, StringLiteral S5,
                      T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, S4, S5, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, StringLiteral S4, StringLiteral S5,
                      StringLiteral S6, T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, S4, S5, S6, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, StringLiteral S4, StringLiteral S5,
                      StringLiteral S6, StringLiteral S7, T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, S4, S5, S6, S7, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, StringLiteral S4, StringLiteral S5,
                      StringLiteral S6, StringLiteral S7, StringLiteral S8,
                      T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, S4, S5, S6, S7, S8, Value);
  }

StringSwitch &Cases(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                      StringLiteral S3, StringLiteral S4, StringLiteral S5,
                      StringLiteral S6, StringLiteral S7, StringLiteral S8,
                      StringLiteral S9, T Value) {
    return Case(S0, Value).Cases(S1, S2, S3, S4, S5, S6, S7, S8, S9, Value);
  }

// Case-insensitive case matchers.
  StringSwitch &CaseLower(StringLiteral S, T Value) {
    if (!Result && Str.equals_lower(S))
      Result = std::move(Value);

return *this;
  }

StringSwitch &EndsWithLower(StringLiteral S, T Value) {
    if (!Result && Str.endswith_lower(S))
      Result = Value;

return *this;
  }

StringSwitch &StartsWithLower(StringLiteral S, T Value) {
    if (!Result && Str.startswith_lower(S))
      Result = std::move(Value);

return *this;
  }

StringSwitch &CasesLower(StringLiteral S0, StringLiteral S1, T Value) {
    return CaseLower(S0, Value).CaseLower(S1, Value);
  }

StringSwitch &CasesLower(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                           T Value) {
    return CaseLower(S0, Value).CasesLower(S1, S2, Value);
  }

StringSwitch &CasesLower(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                           StringLiteral S3, T Value) {
    return CaseLower(S0, Value).CasesLower(S1, S2, S3, Value);
  }

StringSwitch &CasesLower(StringLiteral S0, StringLiteral S1, StringLiteral S2,
                           StringLiteral S3, StringLiteral S4, T Value) {
    return CaseLower(S0, Value).CasesLower(S1, S2, S3, S4, Value);
  }

LLVM_NODISCARD
  R Default(T Value) {
    if (Result)
      return std::move(*Result);
    return Value;
  }

LLVM_NODISCARD
  operator R() {
    assert(Result && "Fell off the end of a string-switch");
    return std::move(*Result);
  }
};

} // end namespace llvm

#endif // LLVM_ADT_STRINGSWITCH_H

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