The Tor Browser: comparison intl/icu/source/common/unicode/stringpiece.h

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+:26626729bff5
+// Copyright (C) 2009-2013, International Business Machines
+// Corporation and others. All Rights Reserved.
+//
+// Copyright 2001 and onwards Google Inc.
+// Author: Sanjay Ghemawat
+// This code is a contribution of Google code, and the style used here is
+// a compromise between the original Google code and the ICU coding guidelines.
+// For example, data types are ICU-ified (size_t,int->int32_t),
+// and API comments doxygen-ified, but function names and behavior are
+// as in the original, if possible.
+// Assertion-style error handling, not available in ICU, was changed to
+// parameter "pinning" similar to UnicodeString.
+//
+// In addition, this is only a partial port of the original Google code,
+// limited to what was needed so far. The (nearly) complete original code
+// is in the ICU svn repository at icuhtml/trunk/design/strings/contrib
+// (see ICU ticket 6765, r25517).
+#ifndef __STRINGPIECE_H__
+#define __STRINGPIECE_H__
+/**
+* \file
+* \brief C++ API: StringPiece: Read-only byte string wrapper class.
+*/
+#include "unicode/utypes.h"
+#include "unicode/uobject.h"
+#include "unicode/std_string.h"
+// Arghh!  I wish C++ literals were "string".
+U_NAMESPACE_BEGIN
+/**
+* A string-like object that points to a sized piece of memory.
+*
+* We provide non-explicit singleton constructors so users can pass
+* in a "const char*" or a "string" wherever a "StringPiece" is
+* expected.
+*
+* 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.
+*
+* Systematic usage of StringPiece is encouraged as it will reduce unnecessary
+* conversions from "const char*" to "string" and back again.
+*
+* @stable ICU 4.2
+*/
+class U_COMMON_API StringPiece : public UMemory {
+private:
+const char*   ptr_;
+int32_t       length_;
+public:
+/**
+* Default constructor, creates an empty StringPiece.
+* @stable ICU 4.2
+*/
+StringPiece() : ptr_(NULL), length_(0) { }
+/**
+* Constructs from a NUL-terminated const char * pointer.
+* @param str a NUL-terminated const char * pointer
+* @stable ICU 4.2
+*/
+StringPiece(const char* str);
+#if U_HAVE_STD_STRING
+/**
+* Constructs from a std::string.
+* @stable ICU 4.2
+*/
+StringPiece(const std::string& str)
+: ptr_(str.data()), length_(static_cast<int32_t>(str.size())) { }
+#endif
+/**
+* Constructs from a const char * pointer and a specified length.
+* @param offset a const char * pointer (need not be terminated)
+* @param len the length of the string; must be non-negative
+* @stable ICU 4.2
+*/
+StringPiece(const char* offset, int32_t len) : ptr_(offset), length_(len) { }
+/**
+* Substring of another StringPiece.
+* @param x the other StringPiece
+* @param pos start position in x; must be non-negative and <= x.length().
+* @stable ICU 4.2
+*/
+StringPiece(const StringPiece& x, int32_t pos);
+/**
+* Substring of another StringPiece.
+* @param x the other StringPiece
+* @param pos start position in x; must be non-negative and <= x.length().
+* @param len length of the substring;
+*            must be non-negative and will be pinned to at most x.length() - pos.
+* @stable ICU 4.2
+*/
+StringPiece(const StringPiece& x, int32_t pos, int32_t len);
+/**
+* Returns the string pointer. May be NULL if it is empty.
+*
+* 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.
+* @return the string pointer
+* @stable ICU 4.2
+*/
+const char* data() const { return ptr_; }
+/**
+* Returns the string length. Same as length().
+* @return the string length
+* @stable ICU 4.2
+*/
+int32_t size() const { return length_; }
+/**
+* Returns the string length. Same as size().
+* @return the string length
+* @stable ICU 4.2
+*/
+int32_t length() const { return length_; }
+/**
+* Returns whether the string is empty.
+* @return TRUE if the string is empty
+* @stable ICU 4.2
+*/
+UBool empty() const { return length_ == 0; }
+/**
+* Sets to an empty string.
+* @stable ICU 4.2
+*/
+void clear() { ptr_ = NULL; length_ = 0; }
+/**
+* Reset the stringpiece to refer to new data.
+* @param xdata pointer the new string data.  Need not be nul terminated.
+* @param len the length of the new data
+* @stable ICU 4.8
+*/
+void set(const char* xdata, int32_t len) { ptr_ = xdata; length_ = len; }
+/**
+* Reset the stringpiece to refer to new data.
+* @param str a pointer to a NUL-terminated string.
+* @stable ICU 4.8
+*/
+void set(const char* str);
+/**
+* Removes the first n string units.
+* @param n prefix length, must be non-negative and <=length()
+* @stable ICU 4.2
+*/
+void remove_prefix(int32_t n) {
+if (n >= 0) {
+if (n > length_) {
+n = length_;
+}
+ptr_ += n;
+length_ -= n;
+}
+}
+/**
+* Removes the last n string units.
+* @param n suffix length, must be non-negative and <=length()
+* @stable ICU 4.2
+*/
+void remove_suffix(int32_t n) {
+if (n >= 0) {
+if (n <= length_) {
+length_ -= n;
+} else {
+length_ = 0;
+}
+}
+}
+/**
+* Maximum integer, used as a default value for substring methods.
+* @stable ICU 4.2
+*/
+static const int32_t npos; // = 0x7fffffff;
+/**
+* Returns a substring of this StringPiece.
+* @param pos start position; must be non-negative and <= length().
+* @param len length of the substring;
+*            must be non-negative and will be pinned to at most length() - pos.
+* @return the substring StringPiece
+* @stable ICU 4.2
+*/
+StringPiece substr(int32_t pos, int32_t len = npos) const {
+return StringPiece(*this, pos, len);
+}
+};
+/**
+* Global operator == for StringPiece
+* @param x The first StringPiece to compare.
+* @param y The second StringPiece to compare.
+* @return TRUE if the string data is equal
+* @stable ICU 4.8
+*/
+U_EXPORT UBool U_EXPORT2
+operator==(const StringPiece& x, const StringPiece& y);
+/**
+* Global operator != for StringPiece
+* @param x The first StringPiece to compare.
+* @param y The second StringPiece to compare.
+* @return TRUE if the string data is not equal
+* @stable ICU 4.8
+*/
+inline UBool operator!=(const StringPiece& x, const StringPiece& y) {
+return !(x == y);
+}
+U_NAMESPACE_END
+#endif  // __STRINGPIECE_H__

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comparison: intl/icu/source/common/unicode/stringpiece.h

intl/icu/source/common/unicode/stringpiece.h