/**
* <pre>
* (RULE e int _p (returns int v)
* (BLOCK
* (ALT
* (BLOCK
* (ALT INT {$v = $INT.int;})
* (ALT '(' (= x e) ')' {$v = $x.v;})
* (ALT ID))
* (* (BLOCK
* (OPTIONS ...)
* (ALT {7 >= $_p}? '*' (= b e) {$v = $a.v * $b.v;})
* (ALT {6 >= $_p}? '+' (= b e) {$v = $a.v + $b.v;})
* (ALT {3 >= $_p}? '++') (ALT {2 >= $_p}? '--'))))))
* </pre>
*/
public virtual void SetAltASTPointers(LeftRecursiveRule r, RuleAST t)
{
//System.Console.WriteLine("RULE: " + t.ToStringTree());
BlockAST ruleBlk = (BlockAST)t.GetFirstChildWithType(ANTLRParser.BLOCK);
AltAST mainAlt = (AltAST)ruleBlk.GetChild(0);
BlockAST primaryBlk = (BlockAST)mainAlt.GetChild(0);
BlockAST opsBlk = (BlockAST)mainAlt.GetChild(1).GetChild(0); // (* BLOCK ...)
for (int i = 0; i < r.recPrimaryAlts.Count; i++)
{
LeftRecursiveRuleAltInfo altInfo = r.recPrimaryAlts[i];
altInfo.altAST = (AltAST)primaryBlk.GetChild(i);
altInfo.altAST.leftRecursiveAltInfo = altInfo;
altInfo.originalAltAST.leftRecursiveAltInfo = altInfo;
//altInfo.originalAltAST.Parent = altInfo.altAST.Parent;
//System.Console.WriteLine(altInfo.altAST.ToStringTree());
}
for (int i = 0; i < r.recOpAlts.Count; i++)
{
LeftRecursiveRuleAltInfo altInfo = r.recOpAlts.GetElement(i);
altInfo.altAST = (AltAST)opsBlk.GetChild(i);
altInfo.altAST.leftRecursiveAltInfo = altInfo;
altInfo.originalAltAST.leftRecursiveAltInfo = altInfo;
//altInfo.originalAltAST.Parent = altInfo.altAST.Parent;
//System.Console.WriteLine(altInfo.altAST.ToStringTree());
}
}
/**
* {@code (BLOCK (ALT .))} or {@code (BLOCK (ALT 'a') (ALT .))}.
*/
public static bool BlockHasWildcardAlt([NotNull] GrammarAST block)
{
foreach (object alt in block.Children)
{
if (!(alt is AltAST))
{
continue;
}
AltAST altAST = (AltAST)alt;
if (altAST.ChildCount == 1 || (altAST.ChildCount == 2 && altAST.GetChild(0).Type == ANTLRParser.ELEMENT_OPTIONS))
{
ITree e = altAST.GetChild(altAST.ChildCount - 1);
if (e.Type == ANTLRParser.WILDCARD)
{
return(true);
}
}
}
return(false);
}
