private Lexeme PeekLexeme(int lookAhead)
{
while (m_lookAheadQueue.Count < lookAhead)
{
//look ahead more
m_lookAheadQueue.Enqueue(m_masterScanner.Read());
}
Lexeme lookAheadLexeme = m_lookAheadQueue[lookAhead - 1];
return(lookAheadLexeme);
}
public Lexeme Read()
{
Lexeme result;
Debug.Assert(m_offset <= m_masterScanner.History.Count);
if (m_offset < m_masterScanner.History.Count)
{
//queue is available to fetch tokens
result = m_masterScanner.History[m_offset];
}
else
{
result = m_masterScanner.Read();
}
m_offset += 1;
return(result);
}
public void CompactCharSetTest()
{
Lexicon lexicon = new Lexicon();
Lexer global = lexicon.Lexer;
Lexer keywords = global.CreateSubLexer();
Lexer xml = keywords.CreateSubLexer();
var lettersCategories = new[] { UnicodeCategory.LetterNumber,
UnicodeCategory.LowercaseLetter,
UnicodeCategory.ModifierLetter,
UnicodeCategory.OtherLetter,
UnicodeCategory.TitlecaseLetter,
UnicodeCategory.UppercaseLetter};
var RE_IDCHAR = RE.CharsOf(c => lettersCategories.Contains(Char.GetUnicodeCategory(c)));
var ID = global.DefineToken(RE_IDCHAR.Concat(
(RE_IDCHAR | RE.Range('0', '9')).Many()));
var NUM = global.DefineToken(RE.Range('0', '9').Many1());
var WHITESPACE = global.DefineToken(RE.Symbol(' ').Many());
var IF = keywords.DefineToken(RE.Literal("if"));
var ELSE = keywords.DefineToken(RE.Literal("else"));
var XMLNS = xml.DefineToken(RE.Literal("xmlns"));
var scannerInfo = lexicon.CreateScannerInfo();
scannerInfo.CurrentLexerIndex = xml.Index;
Scanner s = new Scanner(scannerInfo);
string source = "xmlns 你好吗1 123 蘏臦囧綗 AＢＣＤ if";
SourceReader sr = new SourceReader(new StringReader(source));
s.SetSource(sr);
s.SetTriviaTokens(WHITESPACE.Index);
var l1 = s.Read();
Assert.AreEqual(XMLNS.Index, l1.TokenIndex);
var l2 = s.Read();
Assert.AreEqual(ID.Index, l2.TokenIndex);
var l3 = s.Read();
Assert.AreEqual(NUM.Index, l3.TokenIndex);
var l4 = s.Read();
Assert.AreEqual(ID.Index, l4.TokenIndex);
var l5 = s.Read();
Assert.AreEqual(ID.Index, l5.TokenIndex);
var l6 = s.Read();
Assert.AreEqual(IF.Index, l6.TokenIndex);
}
public void SkipTokenTest()
{
Lexicon lexicon = new Lexicon();
Lexer global = lexicon.Lexer;
Lexer keywords = global.CreateSubLexer();
Lexer xml = keywords.CreateSubLexer();
var ID = global.DefineToken(RE.Range('a', 'z').Concat(
(RE.Range('a', 'z') | RE.Range('0', '9')).Many()));
var NUM = global.DefineToken(RE.Range('0', '9').Many1());
var WHITESPACE = global.DefineToken(RE.Symbol(' ').Many());
var ERROR = global.DefineToken(RE.Range(Char.MinValue, (char)255));
var IF = keywords.DefineToken(RE.Literal("if"));
var ELSE = keywords.DefineToken(RE.Literal("else"));
var XMLNS = xml.DefineToken(RE.Literal("xmlns"));
ScannerInfo info = lexicon.CreateScannerInfo();
Scanner scanner = new Scanner(info);
string source = "asdf04a 1107 else Z if vvv xmlns 772737";
StringReader sr = new StringReader(source);
scanner.SetSource(new SourceReader(sr));
scanner.SetTriviaTokens(WHITESPACE.Index, ERROR.Index);
info.CurrentLexerIndex = xml.Index;
Lexeme l1 = scanner.Read();
Assert.AreEqual(ID.Index, l1.TokenIndex);
Assert.AreEqual("asdf04a", l1.Value.Content);
Assert.AreEqual(0, l1.PrefixTrivia.Count);
Lexeme l2 = scanner.Read();
Assert.AreEqual(NUM.Index, l2.TokenIndex);
Assert.AreEqual("1107", l2.Value.Content);
Assert.AreEqual(1, l2.PrefixTrivia.Count);
Lexeme l3 = scanner.Read();
Assert.AreEqual(ELSE.Index, l3.TokenIndex);
Assert.AreEqual("else", l3.Value.Content);
Assert.AreEqual(1, l2.PrefixTrivia.Count);
Lexeme l4 = scanner.Read();
Assert.AreEqual(IF.Index, l4.TokenIndex);
Assert.AreEqual("if", l4.Value.Content);
Assert.AreEqual(3, l4.PrefixTrivia.Count);
int p1 = scanner.Peek();
Assert.AreEqual(ID.Index, p1);
int p2 = scanner.Peek2();
int p3 = scanner.Peek(3);
int peof = scanner.Peek(4);
Assert.AreEqual(info.EndOfStreamTokenIndex, peof);
Lexeme l6 = scanner.Read();
Lexeme l7 = scanner.Read();
Assert.AreEqual(XMLNS.Index, l7.TokenIndex);
Lexeme l8 = scanner.Read();
Assert.AreEqual(NUM.Index, l8.TokenIndex);
Lexeme leof = scanner.Read();
Assert.AreEqual(info.EndOfStreamTokenIndex, leof.TokenIndex);
Assert.AreEqual(leof.Value.Span.StartLocation.CharIndex, leof.Value.Span.EndLocation.CharIndex);
Assert.AreEqual(source.Length, leof.Value.Span.StartLocation.CharIndex);
}
public void ScannerTest()
{
Lexicon lexicon = new Lexicon();
Lexer global = lexicon.Lexer;
Lexer keywords = global.CreateSubLexer();
Lexer xml = keywords.CreateSubLexer();
var ID = global.DefineToken(RE.Range('a', 'z').Concat(
(RE.Range('a', 'z') | RE.Range('0', '9')).Many()));
var NUM = global.DefineToken(RE.Range('0', '9').Many1());
var WHITESPACE = global.DefineToken(RE.Symbol(' ').Many());
var ERROR = global.DefineToken(RE.Range(Char.MinValue, (char)255));
var IF = keywords.DefineToken(RE.Literal("if"));
var ELSE = keywords.DefineToken(RE.Literal("else"));
var XMLNS = xml.DefineToken(RE.Literal("xmlns"));
ScannerInfo info = lexicon.CreateScannerInfo();
Scanner scanner = new Scanner(info);
string source = "asdf04a 1107 else Z if vvv xmlns 772737";
StringReader sr = new StringReader(source);
scanner.SetSource(new SourceReader(sr));
Lexeme l1 = scanner.Read();
Assert.AreEqual(ID.Index, l1.TokenIndex);
Assert.AreEqual("asdf04a", l1.Value.Content);
Assert.AreEqual(0, l1.Value.Span.StartLocation.Column);
Assert.AreEqual(6, l1.Value.Span.EndLocation.Column);
Lexeme l2 = scanner.Read();
Assert.AreEqual(WHITESPACE.Index, l2.TokenIndex);
Assert.AreEqual(" ", l2.Value.Content);
Lexeme l3 = scanner.Read();
Assert.AreEqual(NUM.Index, l3.TokenIndex);
Assert.AreEqual("1107", l3.Value.Content);
Lexeme l4 = scanner.Read();
Assert.AreEqual(WHITESPACE.Index, l4.TokenIndex);
Lexeme l5 = scanner.Read();
Assert.AreEqual(ID.Index, l5.TokenIndex);
int p1 = scanner.Peek();
Assert.AreEqual(WHITESPACE.Index, p1);
int p2 = scanner.Peek2();
Assert.AreEqual(ERROR.Index, p2);
int p3 = scanner.Peek(3);
Assert.AreEqual(WHITESPACE.Index, p3);
int p4 = scanner.Peek(4);
Assert.AreEqual(ID.Index, p4);
int p5 = scanner.Peek(5);
Assert.AreEqual(WHITESPACE.Index, p5);
Lexeme l6 = scanner.Read();
Lexeme l7 = scanner.Read();
Assert.AreEqual(ERROR.Index, l7.TokenIndex);
int p3_2 = scanner.Peek();
Assert.AreEqual(p3, p3_2);
Lexeme l8 = scanner.Read(); // whitespace
Lexeme l9 = scanner.Read(); // ID:if
Lexeme l10 = scanner.Read(); // whitespace
Lexeme l11 = scanner.Read(); // ID:vvv
Lexeme l12 = scanner.Read(); // whitespace
Lexeme l13 = scanner.Read(); // ID:xmlns
Lexeme l14 = scanner.Read(); // whitespace
Lexeme l15 = scanner.Read(); // NUM:772737
Lexeme leof = scanner.Read(); // eof
Assert.AreEqual(info.EndOfStreamTokenIndex, leof.TokenIndex);
Assert.AreEqual(leof.Value.Span.StartLocation.CharIndex, leof.Value.Span.EndLocation.CharIndex);
Assert.AreEqual(source.Length, leof.Value.Span.StartLocation.CharIndex);
Lexeme leof2 = scanner.Read(); //after eof, should return eof again
Assert.AreEqual(info.EndOfStreamTokenIndex, leof2.TokenIndex);
Assert.AreEqual(leof.Value.Span.StartLocation.CharIndex, leof2.Value.Span.StartLocation.CharIndex);
}
public void ErrorRecoveryTest()
{
Lexicon lexicon = new Lexicon();
Lexer global = lexicon.Lexer;
var ID = global.DefineToken(RE.Range('a', 'z').Concat(
(RE.Range('a', 'z') | RE.Range('0', '9')).Many()));
var NUM = global.DefineToken(RE.Range('0', '9').Many1());
var WHITESPACE = global.DefineToken(RE.Symbol(' ').Many());
ScannerInfo info = lexicon.CreateScannerInfo();
Scanner scanner = new Scanner(info);
string source = "asdf04a 1107 !@#$!@ Z if vvv xmlns 772737";
StringReader sr = new StringReader(source);
scanner.SetSource(new SourceReader(sr));
scanner.SetTriviaTokens(WHITESPACE.Index);
scanner.RecoverErrors = true;
CompilationErrorManager em = new CompilationErrorManager();
em.DefineError(101, 0, CompilationStage.Scanning, "Invalid token: {0}");
var el = em.CreateErrorList();
scanner.ErrorList = el;
scanner.LexicalErrorId = 101;
Lexeme l1 = scanner.Read();
Assert.AreEqual(ID.Index, l1.TokenIndex);
Lexeme l2 = scanner.Read();
Assert.AreEqual(NUM.Index, l2.TokenIndex);
Assert.AreEqual(0, el.Count);
Lexeme l3 = scanner.Read();
Assert.AreEqual(ID.Index, l3.TokenIndex);
Assert.IsTrue(el.Count > 0);
Assert.AreEqual(101, el[0].Info.Id);
}