public Stref(Stringe stringe, string str)
{
String = str;
Chares = new Chare[str.Length];
Bases = new bool[str.Length];
var elems = StringInfo.GetTextElementEnumerator(str);
while (elems.MoveNext())
{
Bases[elems.ElementIndex] = true;
}
var length = str.Length;
int line = 1;
int col = 1;
for (int i = 0; i < length; i++)
{
if (str[i] == '\n')
{
line++;
col = 1;
}
else if (Bases[i]) // Advance column only for non-combining characters
{
col++;
}
Chares[i] = new Chare(stringe, str[i], i, line, col);
}
}
internal Chare(Stringe source, char c, int offset)
{
_src = source;
_character = c;
_offset = offset;
_line = _column = 0;
}
private Stringe(Stringe parent, int relativeOffset, int length)
{
_stref = parent._stref;
_offset = parent._offset + relativeOffset;
_length = length;
_substring = null;
}
/// <summary>
/// Determines whether the current stringe is a substringe of the specified parent stringe.
/// </summary>
/// <param name="parent">The parent stringe to compare to.</param>
/// <returns></returns>
public bool IsSubstringeOf(Stringe parent)
{
if (_stref != parent._stref)
{
return(false);
}
return(_offset >= parent._offset && _offset + _length <= parent._offset + parent._length);
}
internal Stringe(Stringe value)
{
_stref = value._stref;
_offset = value._offset;
_length = value._length;
_offset = value._offset;
_substring = value._substring;
}
internal Chare(Stringe source, char c, int offset, int line, int col)
{
_src = source;
_character = c;
_offset = offset;
_line = line;
_column = col;
}
/// <summary>
/// Tokenizes the input stringe and enumerates the resulting tokens.
/// </summary>
/// <param name="input">The input to tokenize.</param>
/// <returns></returns>
public IEnumerable <Token <T> > Tokenize(Stringe input)
{
var reader = new StringeReader(input);
while (!reader.EndOfStringe)
{
yield return(reader.ReadToken(this));
}
}
internal Stringe(Stringe value)
{
_stref = value._stref;
_offset = value._offset;
_length = value._length;
_line = value._line;
_column = value._column;
_offset = value._offset;
_substring = value._substring;
}
/// <summary>
/// Returns a stringe whose endpoints are the specified stringes. The stringes must both belong to the same parent string.
/// </summary>
/// <param name="a">The first stringe.</param>
/// <param name="b">The second stringe.</param>
/// <returns></returns>
public static Stringe Range(Stringe a, Stringe b)
{
if (a == null)
{
throw new ArgumentNullException("a");
}
if (b == null)
{
throw new ArgumentNullException("b");
}
if (a._stref != b._stref)
{
throw new ArgumentException("The stringes do not belong to the same parent.");
}
if (a == b)
{
return(a);
}
if (a.IsSubstringeOf(b))
{
return(b);
}
if (b.IsSubstringeOf(a))
{
return(a);
}
// Right side of A intersects left side of B.
if (a._offset > b._offset && a._offset + a._length < b._offset + b._length)
{
return(a.Substringe(0, b._offset + b._length - a._offset));
}
// Left side of A intersects right side of B.
if (a._offset < b._offset + b._length && a._offset > b._offset)
{
return(b.Substringe(0, a._offset + a._length - b._offset));
}
// A is to the left of B.
if (a._offset + a._length <= b._offset)
{
return(a.Substringe(0, b._offset + b._length - a._offset));
}
// B is to the left of A.
if (b._offset + b._length <= a._offset)
{
return(b.Substringe(0, a._offset + a._length - b._offset));
}
return(null);
}
/// <summary>
/// Indicates whether the specified regular expression matches the input at the reader's current position, and outputs the result.
/// </summary>
/// <param name="regex">The regular expression to test for.</param>
/// <param name="result">The stringe to output the result to.</param>
/// <returns></returns>
public bool IsNext(Regex regex, out Stringe result)
{
if (regex == null)
{
throw new ArgumentNullException("regex");
}
result = null;
var match = regex.Match(_stringe.Value, _pos);
if (!match.Success || match.Index != _pos)
{
return(false);
}
result = _stringe.Substringe(_pos, match.Length);
return(true);
}
private Stringe(Stringe parent, int relativeOffset, int length)
{
_stref = parent._stref;
_offset = parent._offset + relativeOffset;
_length = length;
_substring = null;
// Calculate line/col
_line = parent._line;
_column = parent._column;
// If the offset is to the left, the line/col is already calculated. Fetch it from the Chare cache.
if (relativeOffset < 0)
{
_line = _stref.Chares[_offset].Line;
_column = _stref.Chares[_offset].Column;
return;
}
if (relativeOffset == 0)
{
return; // Do nothing if the offset is the same
}
int aOffset;
for (int i = 0; i < relativeOffset; i++)
{
aOffset = parent._offset + i;
if (_stref.String[aOffset] == '\n')
{
_line++;
_column = 1;
}
else if (_stref.Bases[i]) // Advance column only for non-combining characters
{
_column++;
}
if (_stref.Chares[aOffset] == null)
{
_stref.Chares[aOffset] = new Chare(parent, _stref.String[aOffset], aOffset, _line, _column);
}
}
}
/// <summary>
/// Indicates whether the specified stringe is null or empty.
/// </summary>
/// <param name="stringe">The stringe to test.</param>
/// <returns></returns>
public static bool IsNullOrEmpty(Stringe stringe)
{
return(stringe == null || stringe.Length == 0);
}
/// <summary>
/// Returns an empty stringe based on the position of another stringe.
/// </summary>
/// <param name="basis">The basis stringe to get position info from.</param>
/// <returns></returns>
public static Stringe Empty(Stringe basis)
{
return(new Stringe(basis, 0, 0));
}
public static Match Match(this Regex regex, Stringe value, int startat = 0)
{
return(regex.Match(value.Value, startat));
}
public Token(T id, Stringe value) : base(value)
{
_id = id;
}
/// <summary>
/// Creates a new StringeReader instance using the specified stringe as input.
/// </summary>
/// <param name="value">The stringe to use as input.</param>
public StringeReader(Stringe value)
{
_stringe = value;
_pos = 0;
}
/// <summary>
/// Creates a new StringeReader instance using the specified string as input.
/// </summary>
/// <param name="value">The string to use as input. This will be converted to a root-level stringe.</param>
public StringeReader(string value)
{
_stringe = value.ToStringe();
_pos = 0;
}