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Diffstat (limited to 'chromium/third_party/cld_3/src/src/script_span/stringpiece.h')
-rw-r--r-- | chromium/third_party/cld_3/src/src/script_span/stringpiece.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/chromium/third_party/cld_3/src/src/script_span/stringpiece.h b/chromium/third_party/cld_3/src/src/script_span/stringpiece.h new file mode 100644 index 00000000000..8b80f81641b --- /dev/null +++ b/chromium/third_party/cld_3/src/src/script_span/stringpiece.h @@ -0,0 +1,81 @@ +// Copyright 2013 Google Inc. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// +// A StringPiece points to part or all of a string, double-quoted string +// literal, or other string-like object. A StringPiece does *not* own the +// string to which it points. A StringPiece is not null-terminated. [subset] +// + +#ifndef SCRIPT_SPAN_STRINGPIECE_H_ +#define SCRIPT_SPAN_STRINGPIECE_H_ + +#include <string.h> +#include <string> + +namespace chrome_lang_id { + +typedef int stringpiece_ssize_type; + +class StringPiece { + private: + const char* ptr_; + stringpiece_ssize_type 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) // NOLINT(runtime/explicit) + : ptr_(str), length_(0) { + if (str != NULL) { + length_ = static_cast<stringpiece_ssize_type>(strlen(str)); + } + } + + StringPiece(const std::string& str) // NOLINT(runtime/explicit) + : ptr_(str.data()), length_(0) { + length_ = static_cast<stringpiece_ssize_type>(str.size()); + } + + StringPiece(const char* offset, stringpiece_ssize_type len) + : ptr_(offset), length_(len) { + } + + void remove_prefix(stringpiece_ssize_type n) { + ptr_ += n; + length_ -= n; + } + + void remove_suffix(stringpiece_ssize_type n) { + length_ -= n; + } + + // 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_; } + stringpiece_ssize_type size() const { return length_; } + stringpiece_ssize_type length() const { return length_; } + bool empty() const { return length_ == 0; } +}; + +class StringPiece; + +} // namespace chrome_lang_id + +#endif // SCRIPT_SPAN_STRINGPIECE_H__ |