1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the StringExtras.h header
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/SmallVector.h"
15 #include "llvm/ADT/STLExtras.h"
16 #include "llvm/ADT/StringExtras.h"
19 /// getToken - This function extracts one token from source, ignoring any
20 /// leading characters that appear in the Delimiters string, and ending the
21 /// token at any of the characters that appear in the Delimiters string. If
22 /// there are no tokens in the source string, an empty string is returned.
23 /// The function returns a pair containing the extracted token and the
24 /// remaining tail string.
25 std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
26 StringRef Delimiters) {
27 // Figure out where the token starts.
28 StringRef::size_type Start = Source.find_first_not_of(Delimiters);
29 if (Start == StringRef::npos) Start = Source.size();
31 // Find the next occurrence of the delimiter.
32 StringRef::size_type End = Source.find_first_of(Delimiters, Start);
33 if (End == StringRef::npos) End = Source.size();
35 return std::make_pair(Source.substr(Start, End), Source.substr(End));
38 /// SplitString - Split up the specified string according to the specified
39 /// delimiters, appending the result fragments to the output list.
40 void llvm::SplitString(StringRef Source,
41 SmallVectorImpl<StringRef> &OutFragments,
42 StringRef Delimiters) {
44 tie(S2, S) = getToken(Source, Delimiters);
46 OutFragments.push_back(S2);
47 tie(S2, S) = getToken(S, Delimiters);
51 void llvm::StringRef::split(SmallVectorImpl<StringRef> &A,
52 StringRef Separators, int MaxSplit,
53 bool KeepEmpty) const {
54 StringRef rest = *this;
56 // rest.data() is used to distinguish cases like "a," that splits into
57 // "a" + "" and "a" that splits into "a" + 0.
59 rest.data() != NULL && (MaxSplit < 0 || splits < MaxSplit);
61 std::pair<llvm::StringRef, llvm::StringRef> p = rest.split(Separators);
63 if (p.first.size() != 0 || KeepEmpty)
67 // If we have a tail left, add it.
68 if (rest.data() != NULL && (rest.size() != 0 || KeepEmpty))