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// Scintilla source code edit control
/** @file DBCS.h
** Functions to handle DBCS double byte encodings like Shift-JIS.
**/
// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#ifndef DBCS_H
#define DBCS_H
namespace Scintilla::Internal {
constexpr int cp932 = 932;
constexpr int cp936 = 936;
constexpr int cp949 = 949;
constexpr int cp950 = 950;
constexpr int cp1361 = 1361;
constexpr bool IsDBCSCodePage(int codePage) noexcept {
return codePage == cp932
|| codePage == cp936
|| codePage == cp949
|| codePage == cp950
|| codePage == cp1361;
}
bool DBCSIsLeadByte(int codePage, char ch) noexcept;
bool DBCSIsTrailByte(int codePage, char ch) noexcept;
bool IsDBCSValidSingleByte(int codePage, int ch) noexcept;
// Calculate a number from a DBCS byte pair that can be used to index into an array or map.
// Should only be called with genuine DBCS character pairs which means that ch1 has top bit set.
constexpr uint16_t DBCSIndex(char ch1, char ch2) noexcept {
const unsigned char uch1 = ch1 & 0x7F;
const unsigned char uch2 = ch2;
return (uch1 << 8) | uch2;
}
struct DBCSPair {
char chars[2];
};
using FoldMap = std::array<DBCSPair, 0x8000>;
bool DBCSHasFoldMap(int codePage);
void DBCSSetFoldMap(int codePage, const FoldMap &foldMap);
FoldMap *DBCSGetMutableFoldMap(int codePage);
const FoldMap *DBCSGetFoldMap(int codePage);
}
#endif
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