chromium/third_party/cld_3/src/src/script_span/getonescriptspan.h

// 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.

//
// Author: [email protected] (Dick Sites)
//


#ifndef SCRIPT_SPAN_GETONESCRIPTSPAN_H_
#define SCRIPT_SPAN_GETONESCRIPTSPAN_H_

#include "generated_ulscript.h"
#include "integral_types.h"
#include "offsetmap.h"

namespace chrome_lang_id {
namespace CLD2 {

static const int kMaxScriptBuffer = …;
static const int kMaxScriptLowerBuffer = …;
static const int kMaxScriptBytes = …;   // Leave some room
static const int kWithinScriptTail = …;    // Stop at word space in last
                                            // N bytes of script buffer

struct LangSpan { … };

static inline bool IsContinuationByte(char c) { … }

// Gets lscript number for letters; always returns
//   0 (common script) for non-letters
int GetUTF8LetterScriptNum(const char* src);

// Update src pointer to point to next quadgram, +2..+5
// Looks at src[0..4]
const char* AdvanceQuad(const char* src);

// Utility routine to search alphabetical tables
int BinarySearch(const char* key, int lo, int hi, const CharIntPair* cipair);

// Returns the length in bytes of the prefix of src that is all
//  interchange valid UTF-8
int SpanInterchangeValid(const char* src, int byte_length);

class ScriptScanner { … };

}  // namespace CLD2
}  // namespace chrome_lang_id

#endif  // SCRIPT_SPAN_GETONESCRIPTSPAN_H_