private void ReadSignAsID()
{
SymbolQueue.Enqueue(character);
while (true)
{
if ('a' <= (char)Reader.Peek() && 'z' >= (char)Reader.Peek() || 'A' <= (char)Reader.Peek() && 'Z' >= (char)Reader.Peek())
{
SymbolQueue.Enqueue((char)Reader.Peek());
}
else if ('0' <= (char)Reader.Peek() && '9' >= (char)Reader.Peek())
{
SymbolQueue.Enqueue((char)Reader.Peek());
}
else
{
LexicalLabel label = GetLexicalLabel(new string(SymbolQueue.ToArray()));
if (LexicalLabel.PL0_ID == label)
{
VocabularyUnitNext = new IdentifierVocabularyUnit(label, new string(SymbolQueue.ToArray()), Line);
}
else
{
VocabularyUnitNext = new GeneralVocabularyUnit(label, Line);
}
SymbolQueue.Clear();
return;
}
character = (char)Reader.Read();
}
}
public void LexAnalys()
{
StreamReader reader = new StreamReader(ReaderPath);
try
{
LexAnalysisUnit LexAnalysis = new LexAnalysisUnit(reader);
Console.WriteLine(string.Format("{0,-10}\t{1,-10}\t{2,-8}\t{3,-8}",
"符号类型", "符号名", "符号值", "行号"));
while (null != LexAnalysis.Peek)
{
GeneralVocabularyUnit unit = LexAnalysis.Read;
Console.WriteLine(string.Format("{0,-10}\t{1,-15}\t{2,-8}\t{3,-8}",
unit.LexicalLabel.ToString(), unit.GetString(), unit.GetInt(), unit.Line));
}
}
catch (Exception e)
{
throw e;
}
finally
{
reader.Close();
}
}
public LexAnalysisUnit(StreamReader reader)
{
SymbolQueue = new Queue <char>();
Reader = reader;
VocabularyUnit = null;
VocabularyUnitNext = null;
character = ' ';
Line = 1;
Init();
}
private void ReadSignAsUInt()
{
SymbolQueue.Enqueue(character);
while (true)
{
if ('0' <= (char)Reader.Peek() && '9' >= (char)Reader.Peek())
{
SymbolQueue.Enqueue((char)Reader.Peek());
}
else
{
VocabularyUnitNext = new UnsignedNumberVocabularyUnit(LexicalLabel.PL0_Number, FormatNumber(new string(SymbolQueue.ToArray())), Line);
SymbolQueue.Clear();
return;
}
character = (char)Reader.Read();
}
}
private void ReadStr()
{
if ('a' <= character && 'z' >= character || 'A' <= character && 'Z' >= character)
{
ReadSignAsID();
}
else if ('0' <= character && '9' >= character)
{
ReadSignAsUInt();
}
else if ('\uffff' == character)
{
VocabularyUnitNext = null;
return;
}
else
{
throw new LexAnalysisException(Line, "‘" + character.ToString() + "’");
}
}
private void LexicalAnalysis()
{
if (!Reader.EndOfStream)
{
RemoveSplitSign();
switch (character)
{
case ',':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Comma, Line);
break;
case '(':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_LBrace, Line);
break;
case ')':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_RBrace, Line);
break;
case '.':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Dot, Line);
break;
case ';':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Semicolon, Line);
break;
case '+':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Plus, Line);
break;
case '-':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Sub, Line);
break;
case '*':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Mul, Line);
break;
case '/':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Div, Line);
break;
case '#':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Nequal, Line);
break;
case '=':
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Equal, Line);
break;
case '<':
if ('=' == (char)Reader.Peek())
{
Reader.Read();
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_LessEqual, Line);
}
else
{
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Less, Line);
}
break;
case '>':
if ('=' == (char)Reader.Peek())
{
Reader.Read();
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_GreaterQeual, Line);
}
else
{
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Greater, Line);
}
break;
case ':':
if ('=' == (char)Reader.Peek())
{
Reader.Read();
VocabularyUnitNext = new GeneralVocabularyUnit(LexicalLabel.PL0_Become, Line);
}
else
{
throw new LexAnalysisException(Line, "‘:’、‘" + (char)Reader.Peek() + "’");
}
break;
default:
ReadStr();
break;
}
}
else
{
VocabularyUnitNext = null;
}
}
private void Init()
{
LexicalAnalysis();
VocabularyUnit = VocabularyUnitNext;
LexicalAnalysis();
}