1 files changed, 114 insertions, 0 deletions
diff --git a/lib/Support/StringExtras.cpp b/lib/Support/StringExtras.cpp
new file mode 100644
index 000000000000..1618086e602e
--- /dev/null
+++ b/lib/Support/StringExtras.cpp
@@ -0,0 +1,114 @@
+//===-- StringExtras.cpp - Implement the StringExtras header --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the StringExtras.h header
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/StringExtras.h"
+#include <cstring>
+using namespace llvm;
+
+/// getToken - This function extracts one token from source, ignoring any
+/// leading characters that appear in the Delimiters string, and ending the
+/// token at any of the characters that appear in the Delimiters string.  If
+/// there are no tokens in the source string, an empty string is returned.
+/// The Source source string is updated in place to remove the returned string
+/// and any delimiter prefix from it.
+std::string llvm::getToken(std::string &Source, const char *Delimiters) {
+  size_t NumDelimiters = std::strlen(Delimiters);
+
+  // Figure out where the token starts.
+  std::string::size_type Start =
+    Source.find_first_not_of(Delimiters, 0, NumDelimiters);
+  if (Start == std::string::npos) Start = Source.size();
+
+  // Find the next occurance of the delimiter.
+  std::string::size_type End =
+    Source.find_first_of(Delimiters, Start, NumDelimiters);
+  if (End == std::string::npos) End = Source.size();
+
+  // Create the return token.
+  std::string Result = std::string(Source.begin()+Start, Source.begin()+End);
+
+  // Erase the token that we read in.
+  Source.erase(Source.begin(), Source.begin()+End);
+
+  return Result;
+}
+
+/// SplitString - Split up the specified string according to the specified
+/// delimiters, appending the result fragments to the output list.
+void llvm::SplitString(const std::string &Source, 
+                       std::vector<std::string> &OutFragments,
+                       const char *Delimiters) {
+  std::string S = Source;
+  
+  std::string S2 = getToken(S, Delimiters);
+  while (!S2.empty()) {
+    OutFragments.push_back(S2);
+    S2 = getToken(S, Delimiters);
+  }
+}
+
+
+
+/// UnescapeString - Modify the argument string, turning two character sequences
+/// @verbatim
+/// like '\\' 'n' into '\n'.  This handles: \e \a \b \f \n \r \t \v \' \ and
+/// \num (where num is a 1-3 byte octal value).
+/// @endverbatim
+void llvm::UnescapeString(std::string &Str) {
+  for (unsigned i = 0; i != Str.size(); ++i) {
+    if (Str[i] == '\\' && i != Str.size()-1) {
+      switch (Str[i+1]) {
+      default: continue;  // Don't execute the code after the switch.
+      case 'a': Str[i] = '\a'; break;
+      case 'b': Str[i] = '\b'; break;
+      case 'e': Str[i] = 27; break;
+      case 'f': Str[i] = '\f'; break;
+      case 'n': Str[i] = '\n'; break;
+      case 'r': Str[i] = '\r'; break;
+      case 't': Str[i] = '\t'; break;
+      case 'v': Str[i] = '\v'; break;
+      case '"': Str[i] = '\"'; break;
+      case '\'': Str[i] = '\''; break;
+      case '\\': Str[i] = '\\'; break;
+      }
+      // Nuke the second character.
+      Str.erase(Str.begin()+i+1);
+    }
+  }
+}
+
+/// EscapeString - Modify the argument string, turning '\\' and anything that
+/// doesn't satisfy std::isprint into an escape sequence.
+void llvm::EscapeString(std::string &Str) {
+  for (unsigned i = 0; i != Str.size(); ++i) {
+    if (Str[i] == '\\') {
+      ++i;
+      Str.insert(Str.begin()+i, '\\');
+    } else if (Str[i] == '\t') {
+      Str[i++] = '\\';
+      Str.insert(Str.begin()+i, 't');
+    } else if (Str[i] == '"') {
+      Str.insert(Str.begin()+i++, '\\');
+    } else if (Str[i] == '\n') {
+      Str[i++] = '\\';
+      Str.insert(Str.begin()+i, 'n');
+    } else if (!std::isprint(Str[i])) {
+      // Always expand to a 3-digit octal escape.
+      unsigned Char = Str[i];
+      Str[i++] = '\\';
+      Str.insert(Str.begin()+i++, '0'+((Char/64) & 7));
+      Str.insert(Str.begin()+i++, '0'+((Char/8)  & 7));
+      Str.insert(Str.begin()+i  , '0'+( Char     & 7));
+    }
+  }
+}