LLVM  8.0.0svn
StringExtras.cpp
Go to the documentation of this file.
1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the StringExtras.h header
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/ADT/StringExtras.h"
15 #include "llvm/ADT/SmallVector.h"
17 using namespace llvm;
18 
19 /// StrInStrNoCase - Portable version of strcasestr. Locates the first
20 /// occurrence of string 's1' in string 's2', ignoring case. Returns
21 /// the offset of s2 in s1 or npos if s2 cannot be found.
23  size_t N = s2.size(), M = s1.size();
24  if (N > M)
25  return StringRef::npos;
26  for (size_t i = 0, e = M - N + 1; i != e; ++i)
27  if (s1.substr(i, N).equals_lower(s2))
28  return i;
29  return StringRef::npos;
30 }
31 
32 /// getToken - This function extracts one token from source, ignoring any
33 /// leading characters that appear in the Delimiters string, and ending the
34 /// token at any of the characters that appear in the Delimiters string. If
35 /// there are no tokens in the source string, an empty string is returned.
36 /// The function returns a pair containing the extracted token and the
37 /// remaining tail string.
38 std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
39  StringRef Delimiters) {
40  // Figure out where the token starts.
41  StringRef::size_type Start = Source.find_first_not_of(Delimiters);
42 
43  // Find the next occurrence of the delimiter.
44  StringRef::size_type End = Source.find_first_of(Delimiters, Start);
45 
46  return std::make_pair(Source.slice(Start, End), Source.substr(End));
47 }
48 
49 /// SplitString - Split up the specified string according to the specified
50 /// delimiters, appending the result fragments to the output list.
52  SmallVectorImpl<StringRef> &OutFragments,
53  StringRef Delimiters) {
54  std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);
55  while (!S.first.empty()) {
56  OutFragments.push_back(S.first);
57  S = getToken(S.second, Delimiters);
58  }
59 }
60 
62  for (unsigned i = 0, e = Name.size(); i != e; ++i) {
63  unsigned char C = Name[i];
64  if (isPrint(C) && C != '\\' && C != '"')
65  Out << C;
66  else
67  Out << '\\' << hexdigit(C >> 4) << hexdigit(C & 0x0F);
68  }
69 }
70 
72  for (char C : String) {
73  if (C == '&')
74  Out << "&amp;";
75  else if (C == '<')
76  Out << "&lt;";
77  else if (C == '>')
78  Out << "&gt;";
79  else if (C == '\"')
80  Out << "&quot;";
81  else if (C == '\'')
82  Out << "&apos;";
83  else
84  Out << C;
85  }
86 }
87 
89  for (const char C : String)
90  Out << toLower(C);
91 }
uint64_t CallInst * C
void push_back(const T &Elt)
Definition: SmallVector.h:218
bool isPrint(char C)
Checks whether character C is printable.
Definition: StringExtras.h:106
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
LLVM_NODISCARD bool equals_lower(StringRef RHS) const
equals_lower - Check for string equality, ignoring case.
Definition: StringRef.h:176
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
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...
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 LLVM_ATTRIBUTE_ALWAYS_INLINE StringRef substr(size_t Start, size_t N=npos) const
Return a reference to the substring from [Start, Start + N).
Definition: StringRef.h:598
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:37
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:250
char toLower(char x)
Returns the corresponding lowercase character if x is uppercase.
Definition: StringExtras.h:112
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE StringRef slice(size_t Start, size_t End) const
Return a reference to the substring from [Start, End).
Definition: StringRef.h:710
static const size_t npos
Definition: StringRef.h:51
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:395
#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:46
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
void printHTMLEscaped(StringRef String, raw_ostream &Out)
Print each character of the specified string, escaping HTML special characters.