private void AdvanceUntil(LexemeKind kind)
{
while (Current.Kind != kind)
{
Advance();
}
}
public Lexeme(LexemeKind kind, SourceLocation begin, SourceLocation end, string content)
{
this.Kind = kind;
this.Begin = begin;
this.End = end;
this.Content = content;
}
private Lexeme Lexeme(LexemeKind kind)
{
var content = Builder.ToString();
Builder.Clear();
return(Lexeme(kind, content));
}
private bool Peek(LexemeKind kind, bool ignoreWhitespace = true)
{
if (ignoreWhitespace)
{
SkipWhitespaces();
}
return(Index < Lexemes.Length - 1 && Lexemes[Index + 1].Kind == kind);
}
private Lexeme Lexeme(LexemeKind kind, string content = null)
{
content = content ?? Buffer;
Buffer = "";
var begin = Location;
var end = new SourceLocation(Line, Column + content.Length, Index + content.Length);
return(new Lexeme(kind, begin, end, content));
}
private Lexeme Lexeme(LexemeKind kind, string content = null)
{
if (kind == LexemeKind.NewLine)
{
Column = 0;
Line++;
}
content = content ?? kind.GetCharacter() ?? Buffer.ToString();
Buffer.Clear();
return(new Lexeme(kind, Location, content));
}
private Lexeme Take(LexemeKind lexemeKind, bool ignoreWhitespace = true)
{
if (ignoreWhitespace)
{
SkipWhitespaces();
}
if (Current.Kind != lexemeKind)
{
Error($"Unexpected lexeme: expected {lexemeKind}, found {Current}");
}
return(TakeAny());
}
private Lexeme Take(LexemeKind lexemeKind, string expected = null, bool ignoreWhitespace = true)
{
if (ignoreWhitespace)
{
SkipWhitespaces();
}
if (Current.Kind != lexemeKind)
{
var lexemeChar = lexemeKind.GetCharacter();
Error($"expected {expected ?? lexemeKind.ToString()}{(lexemeChar != null ? $" '{lexemeChar}'" : "")}, found '{Current.Content}' ({Current.Kind})");
}
return(TakeAny());
}
private bool Take(LexemeKind lexemeKind, out Lexeme lexeme, bool ignoreWhitespace = true)
{
if (ignoreWhitespace)
{
SkipWhitespaces();
}
if (Current.Kind == lexemeKind)
{
lexeme = TakeAny();
return(true);
}
lexeme = null;
return(false);
}
private Lexeme Lexeme(LexemeKind kind, string content) => new Lexeme(kind, content, new SourceLocation(Line, Column - (content?.Length ?? 0)));
public static string GetCharacter(this LexemeKind kind)
{
return(CharCache.TryGetValue(kind, out var c)
? c
: CharCache[kind] = typeof(LexemeKind).GetField(kind.ToString()).GetCustomAttribute <DescriptionAttribute>()?.Description);
}
public Lexeme(LexemeKind kind)
{
Kind = kind;
}
public Lexeme(LexemeKind kind, string content, SourceLocation location)
{
this.Kind = kind;
this.Content = content;
this.Location = location;
}