static string ExpandChrSet([CanBeNull] string alphabet)
{
var sb = new StringBuilder(100);
if (alphabet == null)
{
alphabet = "";
}
for (int i = 26; i > alphabet.Length; i--)
{
sb.Append("32,");
}
foreach (char c in alphabet)
{
sb.Append(UnicodeTranslation.ToZscii(c));
sb.Append(',');
}
sb.Remove(sb.Length - 1, 1);
return(sb.ToString());
}
static string TranslateString([NotNull] ZilString zstr, [NotNull] Context ctx, char crlfChar, StringSpacesMode spacesMode)
{
// strip CR/LF and ensure 1 space afterward, translate crlfChar to LF,
// and collapse two spaces after '.' or crlfChar into one
var sb = new StringBuilder(zstr.Text);
char?last = null;
bool sawDotSpace = false;
var zversion = ctx.ZEnvironment.ZVersion;
string DescribeChar(byte zscii)
{
switch (zscii)
{
case 8:
return("backspace");
case 9:
return("tab");
case 11:
return("sentence space");
case 27:
return("escape");
case var _ when zscii < 32:
return("^" + (char)(zscii + 64));
case var _ when zscii < 127:
return("'" + (char)zscii + "'");
default:
return(null);
}
}
for (int i = 0; i < sb.Length; i++)
{
char c = sb[i];
byte b = UnicodeTranslation.ToZscii(c);
if (!StringEncoder.IsPrintable(b, zversion))
{
var warning = new CompilerError(zstr,
CompilerMessages.ZSCII_0_1_Cannot_Be_Safely_Printed_In_Zmachine_Version_2,
b,
DescribeChar(b),
zversion);
ctx.HandleError(warning);
}
switch (spacesMode)
{
case StringSpacesMode.CollapseAfterPeriod:
if ((last == '.' || last == crlfChar) && c == ' ')
{
sawDotSpace = true;
}
else if (sawDotSpace && c == ' ')
{
sb.Remove(i--, 1);
sawDotSpace = false;
last = c;
continue;
}
else
{
sawDotSpace = false;
}
break;
case StringSpacesMode.CollapseWithSentenceSpace:
if ((last == '.' || last == '?' || last == '!') && c == ' ')
{
sawDotSpace = true;
}
else if (sawDotSpace && c == ' ')
{
sb.Remove(i--, 1);
sb[i] = SentenceSpaceChar;
sawDotSpace = false;
last = c;
continue;
}
else
{
sawDotSpace = false;
}
break;
}
switch (c)
{
case '\r':
sb.Remove(i--, 1);
continue;
case '\n':
if (last == crlfChar)
{
sb.Remove(i--, 1);
}
else
{
sb[i] = ' ';
}
break;
default:
if (c == crlfChar)
{
sb[i] = '\n';
}
break;
}
last = c;
}
return(sb.ToString());
}
