/// <summary>
/// Returns true if it quoted.
/// </summary>
public static bool QuoteValue(string str, StringBuilder sb, bool force = false)
{
int ich = sb.Length;
bool f = QuoteValueCore(str, sb, force);
#if DEBUG // Verify the result.
string v = sb.ToString(ich, sb.Length - ich);
var curs = new CharCursor(v);
Contracts.Assert(f == (force || curs.ChCur == '{'));
var lex = new CmdLexer(curs);
var res = new StringBuilder();
// If it was quoted, gathering curly contents should get us the original. Otherwise,
// the result should be equivalent to the original and should be a single token.
if (f)
{
Contracts.Assert(v.StartsWith("{") && v.EndsWith("}"));
lex.GatherCurlyContents(res);
}
else
{
lex.GetToken(res);
}
Contracts.Assert(!lex.Error);
Contracts.Assert(curs.Eof);
Contracts.Assert(str == res.ToString());
#endif
return(f);
}
public static bool NeedsQuoting(StringBuilder sb, int ich)
{
Contracts.AssertValue(sb);
Contracts.Assert(0 <= ich && ich <= sb.Length);
if (ich >= sb.Length)
{
return(true);
}
if (sb[ich] == '{')
{
return(true);
}
// See if we need to quote. If lexing produces a single token with the exact
// same value, then we don't need to.
int ichLim = sb.Length;
int cch = ichLim - ich;
var curs = new CharCursor(sb.ToString(ich, cch));
var lex = new CmdLexer(curs);
lex.GetToken(sb);
Contracts.Assert(curs.IchCur > 0 || lex.Error);
try
{
if (!lex.Error && curs.Eof && sb.Length == ichLim + cch)
{
// See if the characters match.
for (int ichSrc = ich; ; ichSrc++)
{
if (ichSrc >= ichLim)
{
return(false);
}
if (sb[ichSrc] != sb[ichSrc + cch])
{
break;
}
}
}
return(true);
}
finally
{
sb.Length = ich + cch;
}
}
// Try to quote by just slapping curlies around the string. This will normally be sufficient
// and produces a much more aesthetic result than escaping everything.
private static bool TryNaiveQuoting(string str, StringBuilder sb)
{
Contracts.AssertNonEmpty(str);
var curs = new CharCursor("{" + str + "}");
var lex = new CmdLexer(curs);
var res = new StringBuilder();
lex.GatherCurlyContents(res);
if (lex.Error || !curs.Eof || res.Length != str.Length || res.ToString() != str)
{
return(false);
}
sb.Append("{");
sb.Append(str);
sb.Append("}");
return(true);
}
public static string UnquoteValue(string str)
{
if (!str.StartsWith("{") || !str.EndsWith("}"))
{
return(str);
}
CharCursor curs = new CharCursor(str);
CmdLexer lex = new CmdLexer(curs);
// Gather the curly group contents and make sure it consumes everything.
StringBuilder sb = new StringBuilder();
lex.GatherCurlyContents(sb);
if (lex._error || !curs.Eof)
{
return(str);
}
return(sb.ToString());
}
// Determines whether str needs quoting. If not, appends the string to sb and returns try.
// If so, sb's contents are preserved and returns false.
private static bool TryNoQuoting(string str, StringBuilder sb)
{
Contracts.AssertNonEmpty(str);
if (str[0] == '{')
{
return(false);
}
int ichDst = sb.Length;
// See if we need to quote. If lexing produces a single token with the exact
// same value, then we don't need to.
var curs = new CharCursor(str);
var lex = new CmdLexer(curs);
lex.GetToken(sb);
Contracts.Assert(curs.IchCur > 0 || lex.Error);
if (!lex.Error && curs.Eof && sb.Length == ichDst + str.Length)
{
// See if the characters match.
for (int ichSrc = 0; ; ichSrc++)
{
if (ichSrc >= str.Length)
{
return(true);
}
if (sb[ichDst + ichSrc] != str[ichSrc])
{
break;
}
}
}
// Reset the string builder.
sb.Length = ichDst;
return(false);
}
public CmdLexer(CharCursor curs, bool escapes = true)
{
_curs = curs;
_escapes = escapes;
}