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#ifndef CORE_LIB_TEXT_IO_H
#define CORE_LIB_TEXT_IO_H
#include "secure-crt.h"
#include "stream.h"
namespace Slang
{
using Slang::List;
using Slang::_EndLine;
class TextReader
{
protected:
char decodedChar[5];
int decodedCharPtr = 0, decodedCharSize = 0;
virtual void ReadChar() = 0;
public:
virtual ~TextReader()
{
Close();
}
virtual void Close(){}
virtual String ReadLine()=0;
virtual String ReadToEnd()=0;
virtual bool IsEnd() = 0;
int Read(char * buffer, int count);
char Read()
{
if (decodedCharPtr == decodedCharSize)
ReadChar();
if (decodedCharPtr < decodedCharSize)
return decodedChar[decodedCharPtr++];
else
return 0;
}
char Peak()
{
if (decodedCharPtr == decodedCharSize)
ReadChar();
if (decodedCharPtr < decodedCharSize)
return decodedChar[decodedCharPtr];
else
return 0;
}
};
class TextWriter
{
public:
virtual ~TextWriter()
{
Close();
}
virtual void Write(const String & str)=0;
virtual void Write(const char * str)=0;
virtual void Close(){}
template<typename T>
TextWriter & operator << (const T& val)
{
Write(val.ToString());
return *this;
}
TextWriter & operator << (int value)
{
Write(String(value));
return *this;
}
TextWriter & operator << (float value)
{
Write(String(value));
return *this;
}
TextWriter & operator << (double value)
{
Write(String(value));
return *this;
}
TextWriter & operator << (const char* value)
{
Write(value);
return *this;
}
TextWriter & operator << (const String & val)
{
Write(val);
return *this;
}
TextWriter & operator << (const _EndLine &)
{
#ifdef _WIN32
Write("\r\n");
#else
Write("\n");
#endif
return *this;
}
};
template <typename ReadCharFunc>
int GetUnicodePointFromUTF8(const ReadCharFunc & get)
{
int codePoint = 0;
int leading = get(0);
int mask = 0x80;
int count = 0;
while (leading & mask)
{
count++;
mask >>= 1;
}
codePoint = (leading & (mask - 1));
for (int i = 1; i <= count - 1; i++)
{
codePoint <<= 6;
codePoint += (get(i) & 0x3F);
}
return codePoint;
}
template <typename ReadCharFunc>
int GetUnicodePointFromUTF16(const ReadCharFunc & get)
{
int byte0 = (unsigned char)get(0);
int byte1 = (unsigned char)get(1);
int word0 = byte0 + (byte1 << 8);
if (word0 >= 0xD800 && word0 <= 0xDFFF)
{
int byte2 = (unsigned char)get(2);
int byte3 = (unsigned char)get(3);
int word1 = byte2 + (byte3 << 8);
return ((word0 & 0x3FF) << 10) + (word1 & 0x3FF) + 0x10000;
}
else
return word0;
}
template <typename ReadCharFunc>
int GetUnicodePointFromUTF16Reversed(const ReadCharFunc & get)
{
int byte0 = (unsigned char)get(0);
int byte1 = (unsigned char)get(1);
int word0 = (byte0 << 8) + byte1;
if (word0 >= 0xD800 && word0 <= 0xDFFF)
{
int byte2 = (unsigned char)get(2);
int byte3 = (unsigned char)get(3);
int word1 = (byte2 << 8) + byte3;
return ((word0 & 0x3FF) << 10) + (word1 & 0x3FF);
}
else
return word0;
}
template <typename ReadCharFunc>
int GetUnicodePointFromUTF32(const ReadCharFunc & get)
{
int byte0 = (unsigned char)get(0);
int byte1 = (unsigned char)get(1);
int byte2 = (unsigned char)get(2);
int byte3 = (unsigned char)get(3);
return byte0 + (byte1 << 8) + (byte2 << 16) + (byte3 << 24);
}
inline int EncodeUnicodePointToUTF8(char * buffer, int codePoint)
{
int count = 0;
if (codePoint <= 0x7F)
buffer[count++] = ((char)codePoint);
else if (codePoint <= 0x7FF)
{
unsigned char byte = (unsigned char)(0xC0 + (codePoint >> 6));
buffer[count++] = ((char)byte);
byte = 0x80 + (codePoint & 0x3F);
buffer[count++] = ((char)byte);
}
else if (codePoint <= 0xFFFF)
{
unsigned char byte = (unsigned char)(0xE0 + (codePoint >> 12));
buffer[count++] = ((char)byte);
byte = (unsigned char)(0x80 + ((codePoint >> 6) & (0x3F)));
buffer[count++] = ((char)byte);
byte = (unsigned char)(0x80 + (codePoint & 0x3F));
buffer[count++] = ((char)byte);
}
else
{
unsigned char byte = (unsigned char)(0xF0 + (codePoint >> 18));
buffer[count++] = ((char)byte);
byte = (unsigned char)(0x80 + ((codePoint >> 12) & 0x3F));
buffer[count++] = ((char)byte);
byte = (unsigned char)(0x80 + ((codePoint >> 6) & 0x3F));
buffer[count++] = ((char)byte);
byte = (unsigned char)(0x80 + (codePoint & 0x3F));
buffer[count++] = ((char)byte);
}
return count;
}
inline int EncodeUnicodePointToUTF16(unsigned short * buffer, int codePoint)
{
int count = 0;
if (codePoint <= 0xD7FF || (codePoint >= 0xE000 && codePoint <= 0xFFFF))
buffer[count++] = (unsigned short)codePoint;
else
{
int sub = codePoint - 0x10000;
int high = (sub >> 10) + 0xD800;
int low = (sub & 0x3FF) + 0xDC00;
buffer[count++] = (unsigned short)high;
buffer[count++] = (unsigned short)low;
}
return count;
}
inline unsigned short ReverseBitOrder(unsigned short val)
{
int byte0 = val & 0xFF;
int byte1 = val >> 8;
return (unsigned short)(byte1 + (byte0 << 8));
}
inline int EncodeUnicodePointToUTF16Reversed(unsigned short * buffer, int codePoint)
{
int count = 0;
if (codePoint <= 0xD7FF || (codePoint >= 0xE000 && codePoint <= 0xFFFF))
buffer[count++] = ReverseBitOrder((unsigned short)codePoint);
else
{
int sub = codePoint - 0x10000;
int high = (sub >> 10) + 0xD800;
int low = (sub & 0x3FF) + 0xDC00;
buffer[count++] = ReverseBitOrder((unsigned short)high);
buffer[count++] = ReverseBitOrder((unsigned short)low);
}
return count;
}
class Encoding
{
public:
static Encoding * UTF8, * UTF16, *UTF16Reversed, * UTF32;
virtual void GetBytes(List<char>& buffer, const String & str) = 0;
virtual String ToString(const char * buffer, int length) = 0;
virtual ~Encoding()
{}
};
class StreamWriter : public TextWriter
{
private:
List<char> encodingBuffer;
RefPtr<Stream> stream;
Encoding * encoding;
public:
StreamWriter(const String & path, Encoding * encoding = Encoding::UTF8);
StreamWriter(RefPtr<Stream> stream, Encoding * encoding = Encoding::UTF8);
virtual void Write(const String & str);
virtual void Write(const char * str);
virtual void Close()
{
stream->Close();
}
void ReleaseStream()
{
stream = 0;
}
};
class StreamReader : public TextReader
{
private:
RefPtr<Stream> stream;
List<char> buffer;
Encoding * encoding;
UInt ptr;
char ReadBufferChar();
void ReadBuffer();
Encoding * DetermineEncoding();
protected:
virtual void ReadChar()
{
decodedCharPtr = 0;
int codePoint = 0;
if (encoding == Encoding::UTF8)
codePoint = GetUnicodePointFromUTF8([&](int) {return ReadBufferChar(); });
else if (encoding == Encoding::UTF16)
codePoint = GetUnicodePointFromUTF16([&](int) {return ReadBufferChar(); });
else if (encoding == Encoding::UTF16Reversed)
codePoint = GetUnicodePointFromUTF16Reversed([&](int) {return ReadBufferChar(); });
else if (encoding == Encoding::UTF32)
codePoint = GetUnicodePointFromUTF32([&](int) {return ReadBufferChar(); });
decodedCharSize = EncodeUnicodePointToUTF8(decodedChar, codePoint);
}
public:
StreamReader(const String & path);
StreamReader(RefPtr<Stream> stream, Encoding * encoding = nullptr);
virtual String ReadLine();
virtual String ReadToEnd();
virtual bool IsEnd()
{
return ptr == buffer.Count() && stream->IsEnd();
}
virtual void Close()
{
stream->Close();
}
void ReleaseStream()
{
stream = 0;
}
};
}
#endif
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