/usr/include/llvm-3.9/llvm/ADT/StringSwitch.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.
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//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===/
//
// 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 {
/// \brief 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 {
/// \brief The string we are matching.
StringRef Str;
/// \brief The pointer to the result of this switch statement, once known,
/// null before that.
const T *Result;
public:
LLVM_ATTRIBUTE_ALWAYS_INLINE
explicit StringSwitch(StringRef S)
: Str(S), Result(nullptr) { }
template<unsigned N>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& Case(const char (&S)[N], const T& Value) {
if (!Result && N-1 == Str.size() &&
(std::memcmp(S, Str.data(), N-1) == 0)) {
Result = &Value;
}
return *this;
}
template<unsigned N>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& EndsWith(const char (&S)[N], const T &Value) {
if (!Result && Str.size() >= N-1 &&
std::memcmp(S, Str.data() + Str.size() + 1 - N, N-1) == 0) {
Result = &Value;
}
return *this;
}
template<unsigned N>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& StartsWith(const char (&S)[N], const T &Value) {
if (!Result && Str.size() >= N-1 &&
std::memcmp(S, Str.data(), N-1) == 0) {
Result = &Value;
}
return *this;
}
template<unsigned N0, unsigned N1>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& Cases(const char (&S0)[N0], const char (&S1)[N1],
const T& Value) {
if (!Result && (
(N0-1 == Str.size() && std::memcmp(S0, Str.data(), N0-1) == 0) ||
(N1-1 == Str.size() && std::memcmp(S1, Str.data(), N1-1) == 0))) {
Result = &Value;
}
return *this;
}
template<unsigned N0, unsigned N1, unsigned N2>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& Cases(const char (&S0)[N0], const char (&S1)[N1],
const char (&S2)[N2], const T& Value) {
if (!Result && (
(N0-1 == Str.size() && std::memcmp(S0, Str.data(), N0-1) == 0) ||
(N1-1 == Str.size() && std::memcmp(S1, Str.data(), N1-1) == 0) ||
(N2-1 == Str.size() && std::memcmp(S2, Str.data(), N2-1) == 0))) {
Result = &Value;
}
return *this;
}
template<unsigned N0, unsigned N1, unsigned N2, unsigned N3>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& Cases(const char (&S0)[N0], const char (&S1)[N1],
const char (&S2)[N2], const char (&S3)[N3],
const T& Value) {
if (!Result && (
(N0-1 == Str.size() && std::memcmp(S0, Str.data(), N0-1) == 0) ||
(N1-1 == Str.size() && std::memcmp(S1, Str.data(), N1-1) == 0) ||
(N2-1 == Str.size() && std::memcmp(S2, Str.data(), N2-1) == 0) ||
(N3-1 == Str.size() && std::memcmp(S3, Str.data(), N3-1) == 0))) {
Result = &Value;
}
return *this;
}
template<unsigned N0, unsigned N1, unsigned N2, unsigned N3, unsigned N4>
LLVM_ATTRIBUTE_ALWAYS_INLINE
StringSwitch& Cases(const char (&S0)[N0], const char (&S1)[N1],
const char (&S2)[N2], const char (&S3)[N3],
const char (&S4)[N4], const T& Value) {
if (!Result && (
(N0-1 == Str.size() && std::memcmp(S0, Str.data(), N0-1) == 0) ||
(N1-1 == Str.size() && std::memcmp(S1, Str.data(), N1-1) == 0) ||
(N2-1 == Str.size() && std::memcmp(S2, Str.data(), N2-1) == 0) ||
(N3-1 == Str.size() && std::memcmp(S3, Str.data(), N3-1) == 0) ||
(N4-1 == Str.size() && std::memcmp(S4, Str.data(), N4-1) == 0))) {
Result = &Value;
}
return *this;
}
LLVM_ATTRIBUTE_ALWAYS_INLINE
R Default(const T& Value) const {
if (Result)
return *Result;
return Value;
}
LLVM_ATTRIBUTE_ALWAYS_INLINE
operator R() const {
assert(Result && "Fell off the end of a string-switch");
return *Result;
}
};
} // end namespace llvm
#endif // LLVM_ADT_STRINGSWITCH_H
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