//===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file contains some functions that are useful when dealing with strings.
#define LLVM_ADT_STRINGEXTRAS_H
#include "llvm/Support/DataTypes.h"
+#include "llvm/ADT/APFloat.h"
+#include "llvm/ADT/StringRef.h"
#include <cctype>
#include <cstdio>
#include <string>
+#include <vector>
namespace llvm {
+template<typename T> class SmallVectorImpl;
-static inline std::string utohexstr(uint64_t X) {
- char Buffer[40];
- char *BufPtr = Buffer+39;
+/// hexdigit - Return the hexadecimal character for the
+/// given number \arg X (which should be less than 16).
+static inline char hexdigit(unsigned X, bool LowerCase = false) {
+ const char HexChar = LowerCase ? 'a' : 'A';
+ return X < 10 ? '0' + X : HexChar + X - 10;
+}
- *BufPtr = 0; // Null terminate buffer...
- if (X == 0) *--BufPtr = '0'; // Handle special case...
+/// utohex_buffer - Emit the specified number into the buffer specified by
+/// BufferEnd, returning a pointer to the start of the string. This can be used
+/// like this: (note that the buffer must be large enough to handle any number):
+/// char Buffer[40];
+/// printf("0x%s", utohex_buffer(X, Buffer+40));
+///
+/// This should only be used with unsigned types.
+///
+template<typename IntTy>
+static inline char *utohex_buffer(IntTy X, char *BufferEnd) {
+ char *BufPtr = BufferEnd;
+ *--BufPtr = 0; // Null terminate buffer.
+ if (X == 0) {
+ *--BufPtr = '0'; // Handle special case.
+ return BufPtr;
+ }
while (X) {
- unsigned char Mod = (unsigned char)X & 15;
- if (Mod < 10)
- *--BufPtr = '0' + Mod;
- else
- *--BufPtr = 'A' + Mod-10;
+ unsigned char Mod = static_cast<unsigned char>(X) & 15;
+ *--BufPtr = hexdigit(Mod);
X >>= 4;
}
- return std::string(BufPtr);
+ return BufPtr;
}
-static inline std::string utostr(unsigned long long X, bool isNeg = false) {
- char Buffer[40];
- char *BufPtr = Buffer+39;
+static inline std::string utohexstr(uint64_t X) {
+ char Buffer[17];
+ return utohex_buffer(X, Buffer+17);
+}
+
+static inline std::string utostr_32(uint32_t X, bool isNeg = false) {
+ char Buffer[11];
+ char *BufPtr = Buffer+11;
- *BufPtr = 0; // Null terminate buffer...
if (X == 0) *--BufPtr = '0'; // Handle special case...
while (X) {
}
if (isNeg) *--BufPtr = '-'; // Add negative sign...
- return std::string(BufPtr);
-}
-static inline std::string utostr(unsigned long X, bool isNeg = false) {
- return utostr(static_cast<unsigned long long>(X), isNeg);
+ return std::string(BufPtr, Buffer+11);
}
-static inline std::string utostr(unsigned X, bool isNeg = false) {
- char Buffer[20];
- char *BufPtr = Buffer+19;
+static inline std::string utostr(uint64_t X, bool isNeg = false) {
+ char Buffer[21];
+ char *BufPtr = Buffer+21;
- *BufPtr = 0; // Null terminate buffer...
if (X == 0) *--BufPtr = '0'; // Handle special case...
while (X) {
}
if (isNeg) *--BufPtr = '-'; // Add negative sign...
-
- return std::string(BufPtr);
+ return std::string(BufPtr, Buffer+21);
}
-static inline std::string itostr(long long X) {
- if (X < 0)
- return utostr(static_cast<uint64_t>(-X), true);
- else
- return utostr(static_cast<uint64_t>(X));
-}
-
-static inline std::string itostr(long X) {
- if (X < 0)
+
+static inline std::string itostr(int64_t X) {
+ if (X < 0)
return utostr(static_cast<uint64_t>(-X), true);
else
return utostr(static_cast<uint64_t>(X));
}
-static inline std::string itostr(int X) {
- if (X < 0)
- return utostr(static_cast<unsigned>(-X), true);
- else
- return utostr(static_cast<unsigned>(X));
-}
-
static inline std::string ftostr(double V) {
char Buffer[200];
sprintf(Buffer, "%20.6e", V);
return B;
}
-static inline std::string LowercaseString(const std::string &S) {
+static inline std::string ftostr(const APFloat& V) {
+ if (&V.getSemantics() == &APFloat::IEEEdouble)
+ return ftostr(V.convertToDouble());
+ else if (&V.getSemantics() == &APFloat::IEEEsingle)
+ return ftostr((double)V.convertToFloat());
+ return "<unknown format in ftostr>"; // error
+}
+
+static inline std::string LowercaseString(const std::string &S) {
std::string result(S);
for (unsigned i = 0; i < S.length(); ++i)
if (isupper(result[i]))
- result[i] = (char)tolower(result[i]);
+ result[i] = char(tolower(result[i]));
+ return result;
+}
+
+static inline std::string UppercaseString(const std::string &S) {
+ std::string result(S);
+ for (unsigned i = 0; i < S.length(); ++i)
+ if (islower(result[i]))
+ result[i] = char(toupper(result[i]));
return result;
}
+/// 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 Source source string is updated in place to remove the returned string
-/// and any delimiter prefix from it.
-std::string getToken(std::string &Source,
- const char *Delimiters = " \t\n\v\f\r");
+/// 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");
+
+/// HashString - Hash funtion for strings.
+///
+/// This is the Bernstein hash function.
+//
+// FIXME: Investigate whether a modified bernstein hash function performs
+// better: http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx
+// X*33+c -> X*33^c
+static inline unsigned HashString(StringRef Str, unsigned Result = 0) {
+ for (unsigned i = 0, e = Str.size(); i != e; ++i)
+ Result = Result * 33 + Str[i];
+ return Result;
+}
} // End llvm namespace
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