mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-22 10:29:35 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89372 91177308-0d34-0410-b5e6-96231b3b80d8
224 lines
6.3 KiB
C++
224 lines
6.3 KiB
C++
//===-- StringRef.cpp - Lightweight String References ---------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
using namespace llvm;
|
|
|
|
// MSVC emits references to this into the translation units which reference it.
|
|
#ifndef _MSC_VER
|
|
const size_t StringRef::npos;
|
|
#endif
|
|
|
|
static char ascii_tolower(char x) {
|
|
if (x >= 'A' && x <= 'Z')
|
|
return x - 'A' + 'a';
|
|
return x;
|
|
}
|
|
|
|
/// compare_lower - Compare strings, ignoring case.
|
|
int StringRef::compare_lower(StringRef RHS) const {
|
|
for (size_t I = 0, E = min(Length, RHS.Length); I != E; ++I) {
|
|
char LHC = ascii_tolower(Data[I]);
|
|
char RHC = ascii_tolower(RHS.Data[I]);
|
|
if (LHC != RHC)
|
|
return LHC < RHC ? -1 : 1;
|
|
}
|
|
|
|
if (Length == RHS.Length)
|
|
return 0;
|
|
return Length < RHS.Length ? -1 : 1;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// String Searching
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
/// find - Search for the first string \arg Str in the string.
|
|
///
|
|
/// \return - The index of the first occurence of \arg Str, or npos if not
|
|
/// found.
|
|
size_t StringRef::find(StringRef Str, size_t From) const {
|
|
size_t N = Str.size();
|
|
if (N > Length)
|
|
return npos;
|
|
for (size_t e = Length - N + 1, i = min(From, e); i != e; ++i)
|
|
if (substr(i, N).equals(Str))
|
|
return i;
|
|
return npos;
|
|
}
|
|
|
|
/// rfind - Search for the last string \arg Str in the string.
|
|
///
|
|
/// \return - The index of the last occurence of \arg Str, or npos if not
|
|
/// found.
|
|
size_t StringRef::rfind(StringRef Str) const {
|
|
size_t N = Str.size();
|
|
if (N > Length)
|
|
return npos;
|
|
for (size_t i = Length - N + 1, e = 0; i != e;) {
|
|
--i;
|
|
if (substr(i, N).equals(Str))
|
|
return i;
|
|
}
|
|
return npos;
|
|
}
|
|
|
|
/// find_first_of - Find the first character in the string that is in \arg
|
|
/// Chars, or npos if not found.
|
|
///
|
|
/// Note: O(size() * Chars.size())
|
|
StringRef::size_type StringRef::find_first_of(StringRef Chars,
|
|
size_t From) const {
|
|
for (size_type i = min(From, Length), e = Length; i != e; ++i)
|
|
if (Chars.find(Data[i]) != npos)
|
|
return i;
|
|
return npos;
|
|
}
|
|
|
|
/// find_first_not_of - Find the first character in the string that is not
|
|
/// \arg C or npos if not found.
|
|
StringRef::size_type StringRef::find_first_not_of(char C, size_t From) const {
|
|
for (size_type i = min(From, Length), e = Length; i != e; ++i)
|
|
if (Data[i] != C)
|
|
return i;
|
|
return npos;
|
|
}
|
|
|
|
/// find_first_not_of - Find the first character in the string that is not
|
|
/// in the string \arg Chars, or npos if not found.
|
|
///
|
|
/// Note: O(size() * Chars.size())
|
|
StringRef::size_type StringRef::find_first_not_of(StringRef Chars,
|
|
size_t From) const {
|
|
for (size_type i = min(From, Length), e = Length; i != e; ++i)
|
|
if (Chars.find(Data[i]) == npos)
|
|
return i;
|
|
return npos;
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Helpful Algorithms
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// count - Return the number of non-overlapped occurrences of \arg Str in
|
|
/// the string.
|
|
size_t StringRef::count(StringRef Str) const {
|
|
size_t Count = 0;
|
|
size_t N = Str.size();
|
|
if (N > Length)
|
|
return 0;
|
|
for (size_t i = 0, e = Length - N + 1; i != e; ++i)
|
|
if (substr(i, N).equals(Str))
|
|
++Count;
|
|
return Count;
|
|
}
|
|
|
|
/// GetAsUnsignedInteger - Workhorse method that converts a integer character
|
|
/// sequence of radix up to 36 to an unsigned long long value.
|
|
static bool GetAsUnsignedInteger(StringRef Str, unsigned Radix,
|
|
unsigned long long &Result) {
|
|
// Autosense radix if not specified.
|
|
if (Radix == 0) {
|
|
if (Str.startswith("0x")) {
|
|
Str = Str.substr(2);
|
|
Radix = 16;
|
|
} else if (Str.startswith("0b")) {
|
|
Str = Str.substr(2);
|
|
Radix = 2;
|
|
} else if (Str.startswith("0"))
|
|
Radix = 8;
|
|
else
|
|
Radix = 10;
|
|
}
|
|
|
|
// Empty strings (after the radix autosense) are invalid.
|
|
if (Str.empty()) return true;
|
|
|
|
// Parse all the bytes of the string given this radix. Watch for overflow.
|
|
Result = 0;
|
|
while (!Str.empty()) {
|
|
unsigned CharVal;
|
|
if (Str[0] >= '0' && Str[0] <= '9')
|
|
CharVal = Str[0]-'0';
|
|
else if (Str[0] >= 'a' && Str[0] <= 'z')
|
|
CharVal = Str[0]-'a'+10;
|
|
else if (Str[0] >= 'A' && Str[0] <= 'Z')
|
|
CharVal = Str[0]-'A'+10;
|
|
else
|
|
return true;
|
|
|
|
// If the parsed value is larger than the integer radix, the string is
|
|
// invalid.
|
|
if (CharVal >= Radix)
|
|
return true;
|
|
|
|
// Add in this character.
|
|
unsigned long long PrevResult = Result;
|
|
Result = Result*Radix+CharVal;
|
|
|
|
// Check for overflow.
|
|
if (Result < PrevResult)
|
|
return true;
|
|
|
|
Str = Str.substr(1);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool StringRef::getAsInteger(unsigned Radix, unsigned long long &Result) const {
|
|
return GetAsUnsignedInteger(*this, Radix, Result);
|
|
}
|
|
|
|
|
|
bool StringRef::getAsInteger(unsigned Radix, long long &Result) const {
|
|
unsigned long long ULLVal;
|
|
|
|
// Handle positive strings first.
|
|
if (empty() || front() != '-') {
|
|
if (GetAsUnsignedInteger(*this, Radix, ULLVal) ||
|
|
// Check for value so large it overflows a signed value.
|
|
(long long)ULLVal < 0)
|
|
return true;
|
|
Result = ULLVal;
|
|
return false;
|
|
}
|
|
|
|
// Get the positive part of the value.
|
|
if (GetAsUnsignedInteger(substr(1), Radix, ULLVal) ||
|
|
// Reject values so large they'd overflow as negative signed, but allow
|
|
// "-0". This negates the unsigned so that the negative isn't undefined
|
|
// on signed overflow.
|
|
(long long)-ULLVal > 0)
|
|
return true;
|
|
|
|
Result = -ULLVal;
|
|
return false;
|
|
}
|
|
|
|
bool StringRef::getAsInteger(unsigned Radix, int &Result) const {
|
|
long long Val;
|
|
if (getAsInteger(Radix, Val) ||
|
|
(int)Val != Val)
|
|
return true;
|
|
Result = Val;
|
|
return false;
|
|
}
|
|
|
|
bool StringRef::getAsInteger(unsigned Radix, unsigned &Result) const {
|
|
unsigned long long Val;
|
|
if (getAsInteger(Radix, Val) ||
|
|
(unsigned)Val != Val)
|
|
return true;
|
|
Result = Val;
|
|
return false;
|
|
}
|