LLVM  10.0.0svn
StringExtras.cpp
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1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the StringExtras.h header
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/ADT/StringExtras.h"
14 #include "llvm/ADT/SmallVector.h"
16 using namespace llvm;
17 
18 /// StrInStrNoCase - Portable version of strcasestr. Locates the first
19 /// occurrence of string 's1' in string 's2', ignoring case. Returns
20 /// the offset of s2 in s1 or npos if s2 cannot be found.
22  size_t N = s2.size(), M = s1.size();
23  if (N > M)
24  return StringRef::npos;
25  for (size_t i = 0, e = M - N + 1; i != e; ++i)
26  if (s1.substr(i, N).equals_lower(s2))
27  return i;
28  return StringRef::npos;
29 }
30 
31 /// getToken - This function extracts one token from source, ignoring any
32 /// leading characters that appear in the Delimiters string, and ending the
33 /// token at any of the characters that appear in the Delimiters string. If
34 /// there are no tokens in the source string, an empty string is returned.
35 /// The function returns a pair containing the extracted token and the
36 /// remaining tail string.
37 std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
38  StringRef Delimiters) {
39  // Figure out where the token starts.
40  StringRef::size_type Start = Source.find_first_not_of(Delimiters);
41 
42  // Find the next occurrence of the delimiter.
43  StringRef::size_type End = Source.find_first_of(Delimiters, Start);
44 
45  return std::make_pair(Source.slice(Start, End), Source.substr(End));
46 }
47 
48 /// SplitString - Split up the specified string according to the specified
49 /// delimiters, appending the result fragments to the output list.
51  SmallVectorImpl<StringRef> &OutFragments,
52  StringRef Delimiters) {
53  std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);
54  while (!S.first.empty()) {
55  OutFragments.push_back(S.first);
56  S = getToken(S.second, Delimiters);
57  }
58 }
59 
61  for (unsigned i = 0, e = Name.size(); i != e; ++i) {
62  unsigned char C = Name[i];
63  if (isPrint(C) && C != '\\' && C != '"')
64  Out << C;
65  else
66  Out << '\\' << hexdigit(C >> 4) << hexdigit(C & 0x0F);
67  }
68 }
69 
71  for (char C : String) {
72  if (C == '&')
73  Out << "&amp;";
74  else if (C == '<')
75  Out << "&lt;";
76  else if (C == '>')
77  Out << "&gt;";
78  else if (C == '\"')
79  Out << "&quot;";
80  else if (C == '\'')
81  Out << "&apos;";
82  else
83  Out << C;
84  }
85 }
86 
88  for (const char C : String)
89  Out << toLower(C);
90 }
uint64_t CallInst * C
bool isPrint(char C)
Checks whether character C is printable.
Definition: StringExtras.h:105
This class represents lattice values for constants.
Definition: AllocatorList.h:23
LLVM_NODISCARD bool equals_lower(StringRef RHS) const
equals_lower - Check for string equality, ignoring case.
Definition: StringRef.h:167
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
void push_back(const T &Elt)
Definition: SmallVector.h:211
void printEscapedString(StringRef Name, raw_ostream &Out)
Print each character of the specified string, escaping it if it is not printable or if it is an escap...
LLVM_NODISCARD StringRef slice(size_t Start, size_t End) const
Return a reference to the substring from [Start, End).
Definition: StringRef.h:679
LLVM_NODISCARD StringRef substr(size_t Start, size_t N=npos) const
Return a reference to the substring from [Start, Start + N).
Definition: StringRef.h:578
void SplitString(StringRef Source, SmallVectorImpl< StringRef > &OutFragments, StringRef Delimiters=" \\\)
SplitString - Split up the specified string according to the specified delimiters, appending the result fragments to the output list.
std::pair< StringRef, StringRef > getToken(StringRef Source, StringRef Delimiters=" \\\)
getToken - This function extracts one token from source, ignoring any leading characters that appear ...
LLVM_NODISCARD size_t size() const
size - Get the string size.
Definition: StringRef.h:130
char hexdigit(unsigned X, bool LowerCase=false)
hexdigit - Return the hexadecimal character for the given number X (which should be less than 16)...
Definition: StringExtras.h:36
LLVM_NODISCARD size_t find_first_not_of(char C, size_t From=0) const
Find the first character in the string that is not C or npos if not found.
Definition: StringRef.cpp:249
char toLower(char x)
Returns the corresponding lowercase character if x is uppercase.
Definition: StringExtras.h:111
static const size_t npos
Definition: StringRef.h:50
LLVM_NODISCARD size_t find_first_of(char C, size_t From=0) const
Find the first character in the string that is C, or npos if not found.
Definition: StringRef.h:380
#define N
StringRef::size_type StrInStrNoCase(StringRef s1, StringRef s2)
StrInStrNoCase - Portable version of strcasestr.
void printLowerCase(StringRef String, raw_ostream &Out)
printLowerCase - Print each character as lowercase if it is uppercase.
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:45
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
void printHTMLEscaped(StringRef String, raw_ostream &Out)
Print each character of the specified string, escaping HTML special characters.