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"
15 #include "llvm/Support/raw_ostream.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.
StrInStrNoCase(StringRef s1,StringRef s2)21 StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {
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.
getToken(StringRef Source,StringRef Delimiters)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.
SplitString(StringRef Source,SmallVectorImpl<StringRef> & OutFragments,StringRef Delimiters)50 void llvm::SplitString(StringRef Source,
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
printEscapedString(StringRef Name,raw_ostream & Out)60 void llvm::printEscapedString(StringRef Name, raw_ostream &Out) {
61 for (unsigned i = 0, e = Name.size(); i != e; ++i) {
62 unsigned char C = Name[i];
63 if (C == '\\')
64 Out << '\\' << C;
65 else if (isPrint(C) && C != '"')
66 Out << C;
67 else
68 Out << '\\' << hexdigit(C >> 4) << hexdigit(C & 0x0F);
69 }
70 }
71
printHTMLEscaped(StringRef String,raw_ostream & Out)72 void llvm::printHTMLEscaped(StringRef String, raw_ostream &Out) {
73 for (char C : String) {
74 if (C == '&')
75 Out << "&";
76 else if (C == '<')
77 Out << "<";
78 else if (C == '>')
79 Out << ">";
80 else if (C == '\"')
81 Out << """;
82 else if (C == '\'')
83 Out << "'";
84 else
85 Out << C;
86 }
87 }
88
printLowerCase(StringRef String,raw_ostream & Out)89 void llvm::printLowerCase(StringRef String, raw_ostream &Out) {
90 for (const char C : String)
91 Out << toLower(C);
92 }
93