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only store the high surrogate, and use \0 to indicate its empty

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This commit is contained in:
aG0aep6G 2018-04-23 23:04:46 +02:00
parent 2ab81bcbe7
commit bf1b4db8a3
1 changed files with 13 additions and 15 deletions
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28
std/stdio.d
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@ -2833,12 +2833,11 @@ is empty, throws an `Exception`. In case of an I/O error throws
int orientation_;
// A buffer for when we need to transcode.
wchar[2] rbuf16;
size_t rbuf16Filled = 0;
void rbuf16ShouldBeEmpty() @safe
wchar highSurrogate = '\0'; // '\0' indicates empty
void highSurrogateShouldBeEmpty() @safe
{
import std.utf : UTFException;
if (rbuf16Filled > 0)
if (highSurrogate != '\0')
throw new UTFException("unpaired surrogate UTF-16 value");
}
public:
@ -2864,7 +2863,7 @@ is empty, throws an `Exception`. In case of an I/O error throws
file_ = File.init;
/* Destroy file_ before possibly throwing. Else it wouldn't be
destroyed, and its reference count would be wrong. */
rbuf16ShouldBeEmpty();
highSurrogateShouldBeEmpty();
}
this(this) @trusted
@ -2921,7 +2920,7 @@ is empty, throws an `Exception`. In case of an I/O error throws
static if (c.sizeof == 1)
{
// simple char
rbuf16ShouldBeEmpty();
highSurrogateShouldBeEmpty();
if (orientation_ <= 0) trustedFPUTC(c, handle_);
else trustedFPUTWC(c, handle_);
}
@ -2934,21 +2933,20 @@ is empty, throws an `Exception`. In case of an I/O error throws
{
if (c <= 0x7F)
{
rbuf16ShouldBeEmpty();
highSurrogateShouldBeEmpty();
trustedFPUTC(c, handle_);
}
else if (0xD800 <= c && c <= 0xDBFF) // high surrogate
{
rbuf16ShouldBeEmpty();
rbuf16[0] = c;
rbuf16Filled = 1;
highSurrogateShouldBeEmpty();
highSurrogate = c;
}
else // standalone or low surrogate
{
rbuf16[rbuf16Filled] = c;
++rbuf16Filled;
wchar[] str = rbuf16[0 .. rbuf16Filled];
rbuf16Filled = 0;
immutable wchar[2] rbuf = [highSurrogate, c];
wstring str = rbuf[highSurrogate == '\0' ? 1 : 0 .. $];
// Skipping the high surrogate when there's none.
highSurrogate = '\0';
immutable dchar d = decodeFront(str);
char[4] wbuf;
immutable size = encode(wbuf, d);
@ -2965,7 +2963,7 @@ is empty, throws an `Exception`. In case of an I/O error throws
{
import std.utf : encode;
rbuf16ShouldBeEmpty();
highSurrogateShouldBeEmpty();
if (orientation_ <= 0)
{
if (c <= 0x7F)