The Tor Browser: browser/components/translation/cld2/internal/stringpiece.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright 2013 Google Inc. All Rights Reserved.

     2 //

     3 // Licensed under the Apache License, Version 2.0 (the "License");

     4 // you may not use this file except in compliance with the License.

     5 // You may obtain a copy of the License at

     6 //

     7 //     http://www.apache.org/licenses/LICENSE-2.0

     8 //

     9 // Unless required by applicable law or agreed to in writing, software

    10 // distributed under the License is distributed on an "AS IS" BASIS,

    11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    12 // See the License for the specific language governing permissions and

    13 // limitations under the License.

    15 //

    16 // A StringPiece points to part or all of a string, double-quoted string

    17 // literal, or other string-like object.  A StringPiece does *not* own the

    18 // string to which it points.  A StringPiece is not null-terminated. [subset]

    19 //

    21 #ifndef STRINGS_STRINGPIECE_H_

    22 #define STRINGS_STRINGPIECE_H_

    24 #include <string.h>

    25 #include <string>

    28 typedef int stringpiece_ssize_type;

    30 class StringPiece {

    31  private:

    32   const char* ptr_;

    33   stringpiece_ssize_type length_;

    35  public:

    36   // We provide non-explicit singleton constructors so users can pass

    37   // in a "const char*" or a "string" wherever a "StringPiece" is

    38   // expected.

    39   StringPiece() : ptr_(NULL), length_(0) {}

    41   StringPiece(const char* str)  // NOLINT(runtime/explicit)

    42       : ptr_(str), length_(0) {

    43     if (str != NULL) {

    44       length_ = strlen(str);

    45     }

    46   }

    48   StringPiece(const std::string& str)  // NOLINT(runtime/explicit)

    49       : ptr_(str.data()), length_(0) {

    50     length_ = str.size();

    51   }

    53   StringPiece(const char* offset, stringpiece_ssize_type len)

    54       : ptr_(offset), length_(len) {

    55   }

    57   void remove_prefix(stringpiece_ssize_type n) {

    58     ptr_ += n;

    59     length_ -= n;

    60   }

    62   void remove_suffix(stringpiece_ssize_type n) {

    63     length_ -= n;

    64   }

    66   // data() may return a pointer to a buffer with embedded NULs, and the

    67   // returned buffer may or may not be null terminated.  Therefore it is

    68   // typically a mistake to pass data() to a routine that expects a NUL

    69   // terminated string.

    70   const char* data() const { return ptr_; }

    71   stringpiece_ssize_type size() const { return length_; }

    72   stringpiece_ssize_type length() const { return length_; }

    73   bool empty() const { return length_ == 0; }

    74 };

    76 class StringPiece;

    78 #endif  // STRINGS_STRINGPIECE_H__

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