/**
* exprA(0) ::= integer | float | variable | atom | atom( exprA(1200) { , exprA(1200) }* ) | '['
* exprA(1200) { , exprA(1200) }* [ | exprA(1200) ] ']' | '{' [ exprA(1200) ] '}' | '('
* exprA(1200) ')'
*/
private Term expr0() throws InvalidTermException, IOException {
Token t1 = tokenizer.readToken();
/*Castagna 06/2011*/
/*
if (t1.isType(Tokenizer.INTEGER))
return Parser.parseInteger(t1.seq); //todo moved method to Number
if (t1.isType(Tokenizer.FLOAT))
return Parser.parseFloat(t1.seq); //todo moved method to Number
if (t1.isType(Tokenizer.VARIABLE))
return new Var(t1.seq); //todo switched to use the internal check for "_" in Var(String)
*/
int tempStart = tokenizer.tokenStart();
if (t1.isType(Tokenizer.INTEGER)) {
Term i = Parser.parseInteger(t1.seq);
map(i, tokenizer.tokenStart());
return i; // todo moved method to Number
}
if (t1.isType(Tokenizer.FLOAT)) {
Term f = Parser.parseFloat(t1.seq);
map(f, tokenizer.tokenStart());
return f; // todo moved method to Number
}
if (t1.isType(Tokenizer.VARIABLE)) {
Term v = new Var(t1.seq);
map(v, tokenizer.tokenStart());
return v; // todo switched to use the internal check for "_" in Var(String)
}
/**/
if (t1.isType(Tokenizer.ATOM)
|| t1.isType(Tokenizer.SQ_SEQUENCE)
|| t1.isType(Tokenizer.DQ_SEQUENCE)) {
if (!t1.isFunctor())
/*Castagna 06/2011*/
{
// return new Struct(t1.seq);
Term f = new Struct(t1.seq);
map(f, tokenizer.tokenStart());
return f;
}
/**/
String functor = t1.seq;
Token t2 = tokenizer.readToken(); // reading left par
if (!t2.isType(Tokenizer.LPAR))
throw new InvalidTermException(
"Something identified as functor misses its first left parenthesis"); // todo check can
// be skipped
LinkedList<Term> a = expr0_arglist(); // reading arguments
Token t3 = tokenizer.readToken();
if (t3.isType(Tokenizer.RPAR)) // reading right par
/*Castagna 06/2011*/
{
// return new Struct(functor, a);
Term c = new Struct(functor, a);
map(c, tempStart);
return c;
}
/**/
/*Castagna 06/2011*/
// throw new InvalidTermException("Missing right parenthesis: ("+a + " -> here <-");
throw new InvalidTermException(
"Missing right parenthesis '(" + a + "' -> here <-",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
}
if (t1.isType(Tokenizer.LPAR)) {
Term term = expr(false);
if (tokenizer.readToken().isType(Tokenizer.RPAR)) return term;
/*Castagna 06/2011*/
// throw new InvalidTermException("Missing right parenthesis: ("+term + " -> here <-");
throw new InvalidTermException(
"Missing right parenthesis '(" + term + "' -> here <-",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
}
if (t1.isType(Tokenizer.LBRA)) {
Token t2 = tokenizer.readToken();
if (t2.isType(Tokenizer.RBRA)) return new Struct();
tokenizer.unreadToken(t2);
Term term = expr0_list();
if (tokenizer.readToken().isType(Tokenizer.RBRA)) return term;
/*Castagna 06/2011*/
// throw new InvalidTermException("Missing right bracket: ["+term + " -> here <-");
throw new InvalidTermException(
"Missing right bracket '[" + term + " ->' here <-",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
}
if (t1.isType(Tokenizer.LBRA2)) {
Token t2 = tokenizer.readToken();
if (t2.isType(Tokenizer.RBRA2))
/*Castagna 06/2011*/
{
// return new Struct("{}");
Term b = new Struct("{}");
map(b, tempStart);
return b;
}
/**/
tokenizer.unreadToken(t2);
Term arg = expr(false);
t2 = tokenizer.readToken();
if (t2.isType(Tokenizer.RBRA2))
/*Castagna 06/2011*/
{
// return new Struct("{}", arg);
Term b = new Struct("{}", arg);
map(b, tempStart);
return b;
}
/*Castagna 06/2011*/
// throw new InvalidTermException("Missing right braces: {"+arg + " -> here <-");
throw new InvalidTermException(
"Missing right braces '{" + arg + "' -> here <-",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
}
/*Castagna 06/2011*/
// throw new InvalidTermException("The following token could not be identified: "+t1.seq);
throw new InvalidTermException(
"Unexpected token '" + t1.seq + "'",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
}