private PqlPatternNode Pattern()
{
PqlToken id = currentToken;
PqlSynonym synonym = new PqlSynonym(id);
Eat(PqlTokenType.IDENT);
Eat(PqlTokenType.LPAREN);
PqlArgument varRef = Ref();
Eat(PqlTokenType.COMMA);
PqlExpr expr = null;
if (currentToken.Type == PqlTokenType.STRING)
{
expr = Expr(true);
}
else if (currentToken.Type == PqlTokenType.FLOOR)
{
Eat(PqlTokenType.FLOOR);
if (currentToken.Type == PqlTokenType.STRING)
{
expr = Expr(false);
Eat(PqlTokenType.FLOOR);
}
else if (currentToken.Type == PqlTokenType.COMMA)
{
Eat(PqlTokenType.COMMA);
Eat(PqlTokenType.FLOOR);
}
}
Eat(PqlTokenType.RPAREN);
return(new PqlPatternNode(synonym, varRef, expr));
}
private PqlArgument Ref()
{
PqlToken id = currentToken;
if (currentToken.Type == PqlTokenType.IDENT)
{
Eat(PqlTokenType.IDENT);
if (currentToken.Type == PqlTokenType.DOT)
{
Eat(PqlTokenType.DOT);
PqlToken attrRef = currentToken;
Eat(PqlTokenType.ATTRIBUTE);
return(new PqlAttrRef(id, attrRef));
}
return(new PqlSynonym(id));
}
else if (currentToken.Type == PqlTokenType.INTEGER)
{
Eat(PqlTokenType.INTEGER);
return(new PqlInteger(id));
}
else if (currentToken.Type == PqlTokenType.STRING)
{
id = currentToken;
Eat(PqlTokenType.STRING);
return(new PqlString(id));
}
else if (currentToken.Type == PqlTokenType.FLOOR)
{
Eat(PqlTokenType.FLOOR);
return(new PqlEmptyArg());
}
throw new Exception();
}
public PqlParser(PqlLexer lexer)
{
this.lexer = lexer;
currentToken = lexer.GetNextToken();
isTestFile = false;
statementCounter = 0;
}
private void Eat(PqlTokenType type)
{
if (currentToken.Type == type)
{
currentToken = lexer.GetNextToken();
}
else
{
//throw new PqlParserException("Niespodziewany token. Spodziewany: " + type.ToString() + " Rzeczywisty: " + currentToken.Type.ToString(), lexer.lineCounter, lexer.rowCounter);
}
}
private PqlDeclaration Declaration(PqlToken declarationType)
{
PqlToken id = currentToken;
PqlSynonym synonym = new PqlSynonym(id);
Eat(PqlTokenType.IDENT);
if (currentToken.Type == PqlTokenType.COMMA)
{
Eat(PqlTokenType.COMMA);
}
return(new PqlDeclaration(declarationType, synonym));
}
private PqlElem Elem()
{
PqlToken id = currentToken;
Eat(PqlTokenType.IDENT);
if (currentToken.Type == PqlTokenType.DOT)
{
Eat(PqlTokenType.DOT);
PqlToken attrRef = currentToken;
Eat(PqlTokenType.ATTRIBUTE);
return(new PqlAttrRef(id, attrRef));
}
return(new PqlSynonym(id));
}
private void Reset()
{
lexer.Reset();
currentToken = lexer.GetNextToken();
isTestFile = false;
}
