Include RE2 library

third_party/re2/re2/stringpiece.h

Index: third_party/re2/re2/stringpiece.h
diff --git a/third_party/re2/re2/stringpiece.h b/third_party/re2/re2/stringpiece.h
new file mode 100644
index 0000000000000000000000000000000000000000..38a515097be43078bc21af8f40a1bf0e8eb3d41c
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+++ b/third_party/re2/re2/stringpiece.h
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+// Copyright 2001-2010 The RE2 Authors.  All Rights Reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// A string-like object that points to a sized piece of memory.
+//
+// Functions or methods may use const StringPiece& parameters to accept either
+// a "const char*" or a "string" value that will be implicitly converted to
+// a StringPiece.  The implicit conversion means that it is often appropriate
+// to include this .h file in other files rather than forward-declaring
+// StringPiece as would be appropriate for most other Google classes.
+//
+// Systematic usage of StringPiece is encouraged as it will reduce unnecessary
+// conversions from "const char*" to "string" and back again.
+//
+//
+// Arghh!  I wish C++ literals were "string".
+
+#ifndef STRINGS_STRINGPIECE_H__
+#define STRINGS_STRINGPIECE_H__
+
+#include <string.h>
+#include <cstddef>
+#include <iosfwd>
+#include <string>
+#ifdef WIN32
+#include <algorithm>
+#endif
+
+namespace re2 {
+
+class StringPiece {
+ private:
+  const char*   ptr_;
+  int           length_;
+
+ public:
+  // We provide non-explicit singleton constructors so users can pass
+  // in a "const char*" or a "string" wherever a "StringPiece" is
+  // expected.
+  StringPiece() : ptr_(NULL), length_(0) { }
+  StringPiece(const char* str)
+    : ptr_(str), length_((str == NULL) ? 0 : static_cast<int>(strlen(str))) { }
+  StringPiece(const std::string& str)
+    : ptr_(str.data()), length_(static_cast<int>(str.size())) { }
+  StringPiece(const char* offset, int len) : ptr_(offset), length_(len) { }
+
+  // data() may return a pointer to a buffer with embedded NULs, and the
+  // returned buffer may or may not be null terminated.  Therefore it is
+  // typically a mistake to pass data() to a routine that expects a NUL
+  // terminated string.
+  const char* data() const { return ptr_; }
+  int size() const { return length_; }
+  int length() const { return length_; }
+  bool empty() const { return length_ == 0; }
+
+  void clear() { ptr_ = NULL; length_ = 0; }
+  void set(const char* data, int len) { ptr_ = data; length_ = len; }
+  void set(const char* str) {
+    ptr_ = str;
+    if (str != NULL)
+      length_ = static_cast<int>(strlen(str));
+    else
+      length_ = 0;
+  }
+  void set(const void* data, int len) {
+    ptr_ = reinterpret_cast<const char*>(data);
+    length_ = len;
+  }
+
+  char operator[](int i) const { return ptr_[i]; }
+
+  void remove_prefix(int n) {
+    ptr_ += n;
+    length_ -= n;
+  }
+
+  void remove_suffix(int n) {
+    length_ -= n;
+  }
+
+  int compare(const StringPiece& x) const {
+    int r = memcmp(ptr_, x.ptr_, std::min(length_, x.length_));
+    if (r == 0) {
+      if (length_ < x.length_) r = -1;
+      else if (length_ > x.length_) r = +1;
+    }
+    return r;
+  }
+
+  std::string as_string() const {
+    return std::string(data(), size());
+  }
+  // We also define ToString() here, since many other string-like
+  // interfaces name the routine that converts to a C++ string
+  // "ToString", and it's confusing to have the method that does that
+  // for a StringPiece be called "as_string()".  We also leave the
+  // "as_string()" method defined here for existing code.
+  std::string ToString() const {
+    return std::string(data(), size());
+  }
+
+  void CopyToString(std::string* target) const;
+  void AppendToString(std::string* target) const;
+
+  // Does "this" start with "x"
+  bool starts_with(const StringPiece& x) const {
+    return ((length_ >= x.length_) &&
+            (memcmp(ptr_, x.ptr_, x.length_) == 0));
+  }
+
+  // Does "this" end with "x"
+  bool ends_with(const StringPiece& x) const {
+    return ((length_ >= x.length_) &&
+            (memcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));
+  }
+
+  // standard STL container boilerplate
+  typedef char value_type;
+  typedef const char* pointer;
+  typedef const char& reference;
+  typedef const char& const_reference;
+  typedef size_t size_type;
+  typedef ptrdiff_t difference_type;
+  static const size_type npos;
+  typedef const char* const_iterator;
+  typedef const char* iterator;
+  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+  typedef std::reverse_iterator<iterator> reverse_iterator;
+  iterator begin() const { return ptr_; }
+  iterator end() const { return ptr_ + length_; }
+  const_reverse_iterator rbegin() const {
+    return const_reverse_iterator(ptr_ + length_);
+  }
+  const_reverse_iterator rend() const {
+    return const_reverse_iterator(ptr_);
+  }
+  // STLS says return size_type, but Google says return int
+  int max_size() const { return length_; }
+  int capacity() const { return length_; }
+
+  int copy(char* buf, size_type n, size_type pos = 0) const;
+
+  int find(const StringPiece& s, size_type pos = 0) const;
+  int find(char c, size_type pos = 0) const;
+  int rfind(const StringPiece& s, size_type pos = npos) const;
+  int rfind(char c, size_type pos = npos) const;
+
+  StringPiece substr(size_type pos, size_type n = npos) const;
+  
+  static bool _equal(const StringPiece&, const StringPiece&);
+};
+
+inline bool operator==(const StringPiece& x, const StringPiece& y) {
+  return StringPiece::_equal(x, y);
+}
+
+inline bool operator!=(const StringPiece& x, const StringPiece& y) {
+  return !(x == y);
+}
+
+inline bool operator<(const StringPiece& x, const StringPiece& y) {
+  const int r = memcmp(x.data(), y.data(),
+                       std::min(x.size(), y.size()));
+  return ((r < 0) || ((r == 0) && (x.size() < y.size())));
+}
+
+inline bool operator>(const StringPiece& x, const StringPiece& y) {
+  return y < x;
+}
+
+inline bool operator<=(const StringPiece& x, const StringPiece& y) {
+  return !(x > y);
+}
+
+inline bool operator>=(const StringPiece& x, const StringPiece& y) {
+  return !(x < y);
+}
+
+}  // namespace re2
+
+// allow StringPiece to be logged
+extern std::ostream& operator<<(std::ostream& o, const re2::StringPiece& piece);
+
+#endif  // STRINGS_STRINGPIECE_H__