public Lexicon(Compiler compiler)
{
this.linhaAtual = 0;
this.colunaAtual = 0;
this.ponteiro = 0;
this.linhaFonte = "";
this.token = T_NULO;
this.compiler = compiler;
}
private String traduzSimbolo(CompilerCodes tipoDeComparacao)
{
switch (tipoDeComparacao)
{
case T_MAIOR: return(" > ");
case T_MENOR: return(" < ");
case T_MAIORIGUAL: return(" >= ");
case T_MENORIGUAL: return(" <= ");
case T_IGUAL: return(" == ");
case T_DIFERENTE: return(" != ");
}
return(null);
}
public void buscaProximoToken()
{
StringBuilder sbLexema = new StringBuilder("");
while ((lookAhead == 9) ||
(lookAhead == '\n') ||
(lookAhead == 8) ||
(lookAhead == 11) ||
(lookAhead == 12) ||
(lookAhead == '\r') ||
(lookAhead == 32))
{
movelookAhead();
}
/*--------------------------------------------------------------*
* Caso o primeiro caracter seja alfabetico, procuro capturar a *
* sequencia de caracteres que se segue a ele e classifica-la *
*--------------------------------------------------------------*/
if ((lookAhead >= 'A') && (lookAhead <= 'Z'))
{
sbLexema.Append(lookAhead);
movelookAhead();
while (((lookAhead >= 'A') && (lookAhead <= 'Z')) ||
((lookAhead >= '0') && (lookAhead <= '9')) ||
(lookAhead == '_'))
{
sbLexema.Append(lookAhead);
movelookAhead();
}
lexema = sbLexema.ToString();
/* Classifico o meu token como palavra reservada ou id */
if (lexema.Equals("CABO"))
{
token = T_CABO;
}
else if (lexema.Equals("MEMOSTRA"))
{
token = T_MEMOSTRA;
}
else if (lexema.Equals("MECAPTURA"))
{
token = T_MECAPTURA;
}
else if (lexema.Equals("MEREPETE"))
{
token = T_MEREPETE;
}
else if (lexema.Equals("VIRA"))
{
token = T_VIRA;
}
else
{
token = T_ID;
}
}
else if ((lookAhead >= '0') && (lookAhead <= '9'))
{
sbLexema.Append(lookAhead);
movelookAhead();
while ((lookAhead >= '0') && (lookAhead <= '9'))
{
sbLexema.Append(lookAhead);
movelookAhead();
}
if (lookAhead == '.')
{
sbLexema.Append(lookAhead);
movelookAhead();
while ((lookAhead >= '0') && (lookAhead <= '9'))
{
sbLexema.Append(lookAhead);
movelookAhead();
}
}
token = T_NUMERO;
}
else if (lookAhead == '}')
{
sbLexema.Append(lookAhead);
movelookAhead();
if (lookAhead == '}')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_ABREPROG;
}
else
{
token = T_ERRO_LEX;
}
}
else if (lookAhead == '{')
{
sbLexema.Append(lookAhead);
movelookAhead();
if (lookAhead == '{')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_FECHAPROG;
}
else
{
token = T_ERRO_LEX;
}
}
else if (lookAhead == '>')
{
sbLexema.Append(lookAhead);
movelookAhead();
if (lookAhead == '=')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_MAIORIGUAL;
}
else
{
token = T_MAIOR;
}
}
else if (lookAhead == '<')
{
sbLexema.Append(lookAhead);
movelookAhead();
if (lookAhead == '>')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_DIFERENTE;
}
else
{
if (lookAhead == '=')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_MENORIGUAL;
}
else
{
token = T_MENOR;
}
}
}
else if (lookAhead == '=')
{
sbLexema.Append(lookAhead);
movelookAhead();
if (lookAhead == '=')
{
sbLexema.Append(lookAhead);
movelookAhead();
if (lookAhead == '>')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_REPETE_PARA;
}
else
{
token = T_IGUAL;
}
}
else if (lookAhead == '>')
{
sbLexema.Append(lookAhead);
movelookAhead();
token = T_REPETE_DE;
}
else
{
token = T_ERRO_LEX;
compiler.errorMessage = "Erro Léxico na linha: " + linhaAtual + "\nReconhecido ao atingir a coluna: " + colunaAtual + "\nLinha do Erro: <" + linhaFonte + ">\nToken desconhecido: " + lookAhead;
sbLexema.Append(lookAhead);
}
}
else if (lookAhead == ']')
{
sbLexema.Append(lookAhead);
token = T_ABRE_BLOCO;
movelookAhead();
}
else if (lookAhead == '[')
{
sbLexema.Append(lookAhead);
token = T_FECHA_BLOCO;
movelookAhead();
}
else if (lookAhead == '(')
{
sbLexema.Append(lookAhead);
token = T_FECHA_PAR;
movelookAhead();
}
else if (lookAhead == ')')
{
sbLexema.Append(lookAhead);
token = T_ABRE_PAR;
movelookAhead();
}
else if (lookAhead == '+')
{
sbLexema.Append(lookAhead);
token = T_SOMA;
movelookAhead();
}
else if (lookAhead == '-')
{
sbLexema.Append(lookAhead);
token = T_SUBTRAI;
movelookAhead();
}
else if (lookAhead == '*')
{
sbLexema.Append(lookAhead);
token = T_MULTIPLICA;
movelookAhead();
}
else if (lookAhead == '/')
{
sbLexema.Append(lookAhead);
token = T_DIVIDE;
movelookAhead();
}
else if (((int)lookAhead) == (int)FIM_ARQUIVO)
{
token = T_FIM_FONTE;
}
else
{
token = T_ERRO_LEX;
compiler.errorMessage = "Erro Léxico na linha: " + linhaAtual + "\nReconhecido ao atingir a coluna: " + colunaAtual + "\nLinha do Erro: <" + linhaFonte + ">\nToken desconhecido: " + lookAhead;
sbLexema.Append(lookAhead);
}
lexema = sbLexema.ToString();
}
