private RegExp ParseSimpleExp()
{
if (this.Match('.'))
{
return(MakeAnyPrintableASCIIChar());
}
/* Issue 32, https://github.com/moodmosaic/Fare/issues/32
* The intent of the original code is a little unclear. The comment for the Empty value in the
* enum is 'Enables empty language.' Using '#' as token seems non-standard, and caused
* unhandled exception in some cases. The best option at this point is to remove handling of the
* Empty option until a proper implementation is proposed.
*/
// if (this.Check(RegExpSyntaxOptions.Empty) && this.Match('#'))
// {
// return RegExp.MakeEmpty();
// }
if (this.Check(RegExpSyntaxOptions.Anystring) && this.Match('@'))
{
return(RegExp.MakeAnyString());
}
if (this.Match('"'))
{
int start = pos;
while (this.More() && !this.Peek("\""))
{
this.Next();
}
if (!this.Match('"'))
{
throw new ArgumentException("expected '\"' at position " + pos);
}
return(RegExp.MakeString(b.Substring(start, ((pos - 1) - start))));
}
if (this.Match('('))
{
if (this.Match('?'))
{
this.SkipNonCapturingSubpatternExp();
}
if (this.Match(')'))
{
return(RegExp.MakeString(string.Empty));
}
RegExp e = this.ParseUnionExp();
if (!this.Match(')'))
{
throw new ArgumentException("expected ')' at position " + pos);
}
return(e);
}
if ((this.Check(RegExpSyntaxOptions.Automaton) || this.Check(RegExpSyntaxOptions.Interval)) && this.Match('<'))
{
int start = pos;
while (this.More() && !this.Peek(">"))
{
this.Next();
}
if (!this.Match('>'))
{
throw new ArgumentException("expected '>' at position " + pos);
}
string str = b.Substring(start, ((pos - 1) - start));
int i = str.IndexOf('-');
if (i == -1)
{
if (!this.Check(RegExpSyntaxOptions.Automaton))
{
throw new ArgumentException("interval syntax error at position " + (pos - 1));
}
return(RegExp.MakeAutomaton(str));
}
if (!this.Check(RegExpSyntaxOptions.Interval))
{
throw new ArgumentException("illegal identifier at position " + (pos - 1));
}
try
{
if (i == 0 || i == str.Length - 1 || i != str.LastIndexOf('-'))
{
throw new FormatException();
}
string smin = str.Substring(0, i - 0);
string smax = str.Substring(i + 1, (str.Length - (i + 1)));
int imin = int.Parse(smin, System.Globalization.NumberFormatInfo.CurrentInfo);
int imax = int.Parse(smax, System.Globalization.NumberFormatInfo.CurrentInfo);
int numdigits = smin.Length == smax.Length ? smin.Length : 0;
if (imin > imax)
{
int t = imin;
imin = imax;
imax = t;
}
return(RegExp.MakeInterval(imin, imax, numdigits));
}
catch (FormatException)
{
throw new ArgumentException("interval syntax error at position " + (pos - 1));
}
}
if (this.Match('\\'))
{
// Escaped '\' character.
if (this.Match('\\'))
{
return(MakeChar('\\'));
}
bool inclusion;
// Digits.
if ((inclusion = this.Match('d')) || this.Match('D'))
{
RegExp digitChars = MakeCharRange('0', '9');
return(inclusion ? digitChars : ExcludeChars(digitChars, MakeAnyPrintableASCIIChar()));
}
// Whitespace chars only.
if ((inclusion = this.Match('s')) || this.Match('S'))
{
// Do not add line breaks, as usually RegExp is single line.
RegExp whitespaceChars = MakeUnion(MakeChar(' '), MakeChar('\t'));
return(inclusion ? whitespaceChars : ExcludeChars(whitespaceChars, MakeAnyPrintableASCIIChar()));
}
// Word character. Range is [A-Za-z0-9_]
if ((inclusion = this.Match('w')) || this.Match('W'))
{
var ranges = new[] { MakeCharRange('A', 'Z'), MakeCharRange('a', 'z'), MakeCharRange('0', '9') };
RegExp wordChars = ranges.Aggregate(MakeChar('_'), MakeUnion);
return(inclusion ? wordChars : ExcludeChars(wordChars, MakeAnyPrintableASCIIChar()));
}
}
return(RegExp.MakeChar(this.ParseCharExp()));
}
private RegExp ParseSimpleExp()
{
if (this.Match('.'))
{
return(MakeAnyPrintableASCIIChar(this.anyCharAlphabet));
}
if (this.Check(RegExpSyntaxOptions.Empty) && this.Match('#'))
{
return(RegExp.MakeEmpty());
}
if (this.Check(RegExpSyntaxOptions.Anystring) && this.Match('@'))
{
return(RegExp.MakeAnyString());
}
if (this.Match('"'))
{
int start = pos;
while (this.More() && !this.Peek("\""))
{
this.Next();
}
if (!this.Match('"'))
{
throw new ArgumentException("expected '\"' at position " + pos);
}
return(RegExp.MakeString(b.Substring(start, ((pos - 1) - start))));
}
if (this.Match('('))
{
if (this.Match('?'))
{
this.SkipNonCapturingSubpatternExp();
}
if (this.Match(')'))
{
return(RegExp.MakeString(string.Empty));
}
RegExp e = this.ParseUnionExp();
if (!this.Match(')'))
{
throw new ArgumentException("expected ')' at position " + pos);
}
return(e);
}
if ((this.Check(RegExpSyntaxOptions.Automaton) || this.Check(RegExpSyntaxOptions.Interval)) && this.Match('<'))
{
int start = pos;
while (this.More() && !this.Peek(">"))
{
this.Next();
}
if (!this.Match('>'))
{
throw new ArgumentException("expected '>' at position " + pos);
}
string str = b.Substring(start, ((pos - 1) - start));
int i = str.IndexOf('-');
if (i == -1)
{
if (!this.Check(RegExpSyntaxOptions.Automaton))
{
throw new ArgumentException("interval syntax error at position " + (pos - 1));
}
return(RegExp.MakeAutomaton(str));
}
if (!this.Check(RegExpSyntaxOptions.Interval))
{
throw new ArgumentException("illegal identifier at position " + (pos - 1));
}
try
{
if (i == 0 || i == str.Length - 1 || i != str.LastIndexOf('-'))
{
throw new FormatException();
}
string smin = str.Substring(0, i - 0);
string smax = str.Substring(i + 1, (str.Length - (i + 1)));
int imin = int.Parse(smin);
int imax = int.Parse(smax);
int numdigits = smin.Length == smax.Length ? smin.Length : 0;
if (imin > imax)
{
int t = imin;
imin = imax;
imax = t;
}
return(RegExp.MakeInterval(imin, imax, numdigits));
}
catch (FormatException)
{
throw new ArgumentException("interval syntax error at position " + (pos - 1));
}
}
if (this.Match('\\'))
{
// Escaped '\' character.
if (this.Match('\\'))
{
return(MakeChar('\\'));
}
bool inclusion;
// Digits.
if ((inclusion = this.Match('d')) || this.Match('D'))
{
RegExp digitChars = MakeCharRange('0', '9');
return(inclusion
? this.anyCharAlphabet == null
? digitChars
: MakeAnyPrintableASCIIChar(new string((char[])this.anyCharAlphabet.ToCharArray().Where(char.IsDigit).ToArray()))
: ExcludeChars(digitChars, MakeAnyPrintableASCIIChar(this.anyCharAlphabet)));
}
// Whitespace chars only.
if ((inclusion = this.Match('s')) || this.Match('S'))
{
RegExp whitespaceChars = MakeUnion(MakeChar(' '), MakeChar('\t'));
return(inclusion
? this.anyCharAlphabet == null
? whitespaceChars
: MakeAnyPrintableASCIIChar(new string((char[])this.anyCharAlphabet.ToCharArray().Where(char.IsWhiteSpace).ToArray()))
: ExcludeChars(whitespaceChars, MakeAnyPrintableASCIIChar(this.anyCharAlphabet)));
}
// Word character. Range is [A-Za-z0-9_]
if ((inclusion = this.Match('w')) || this.Match('W'))
{
var ranges = new[] { MakeCharRange('A', 'Z'), MakeCharRange('a', 'z'), MakeCharRange('0', '9') };
RegExp wordChars = ranges.Aggregate(MakeChar('_'), MakeUnion);
return(inclusion
? this.anyCharAlphabet == null
? wordChars
: MakeAnyPrintableASCIIChar(new string((char[])this.anyCharAlphabet.ToCharArray()
.Where(x => char.IsLetter(x) || char.IsDigit(x) || x == '_').ToArray()))
: ExcludeChars(wordChars, MakeAnyPrintableASCIIChar(this.anyCharAlphabet)));
}
}
return(RegExp.MakeChar(this.ParseCharExp()));
}
private RegExp ParseSimpleExp()
{
if (this.Match('.'))
{
return(RegExp.MakeAnyChar());
}
if (this.Check(RegExpSyntaxOptions.Empty) && this.Match('#'))
{
return(RegExp.MakeEmpty());
}
if (this.Check(RegExpSyntaxOptions.Anystring) && this.Match('@'))
{
return(RegExp.MakeAnyString());
}
if (this.Match('"'))
{
int start = this.pos;
while (this.More() && !this.Peek("\""))
{
this.Next();
}
if (!this.Match('"'))
{
throw new ArgumentException("expected '\"' at position " + this.pos);
}
return(RegExp.MakeString(this.b.Substring(start, ((this.pos - 1) - start))));
}
if (this.Match('('))
{
if (this.Match('?'))
{
this.SkipNonCapturingSubpatternExp();
}
if (this.Match(')'))
{
return(RegExp.MakeString(string.Empty));
}
RegExp e = this.ParseUnionExp();
if (!this.Match(')'))
{
throw new ArgumentException("expected ')' at position " + this.pos);
}
return(e);
}
if ((this.Check(RegExpSyntaxOptions.Automaton) || this.Check(RegExpSyntaxOptions.Interval)) && this.Match('<'))
{
int start = this.pos;
while (this.More() && !this.Peek(">"))
{
this.Next();
}
if (!this.Match('>'))
{
throw new ArgumentException("expected '>' at position " + this.pos);
}
string str = this.b.Substring(start, ((this.pos - 1) - start));
int i = str.IndexOf('-');
if (i == -1)
{
if (!this.Check(RegExpSyntaxOptions.Automaton))
{
throw new ArgumentException("interval syntax error at position " + (this.pos - 1));
}
return(RegExp.MakeAutomaton(str));
}
if (!this.Check(RegExpSyntaxOptions.Interval))
{
throw new ArgumentException("illegal identifier at position " + (this.pos - 1));
}
try
{
if (i == 0 || i == str.Length - 1 || i != str.LastIndexOf('-'))
{
throw new FormatException();
}
string smin = str.Substring(0, i - 0);
string smax = str.Substring(i + 1, (str.Length - (i + 1)));
int imin = int.Parse(smin, CultureInfo.CurrentCulture);
int imax = int.Parse(smax, CultureInfo.CurrentCulture);
int numdigits = smin.Length == smax.Length ? smin.Length : 0;
if (imin > imax)
{
int t = imin;
imin = imax;
imax = t;
}
return(RegExp.MakeInterval(imin, imax, numdigits));
}
catch (FormatException)
{
throw new ArgumentException("interval syntax error at position " + (this.pos - 1));
}
}
return(RegExp.MakeChar(this.ParseCharExp()));
}