/** {@code (BLOCK (ALT .))} or {@code (BLOCK (ALT 'a') (ALT .))}. */
public static boolean blockHasWildcardAlt(@NotNull GrammarAST block) {
for (Object alt : block.getChildren()) {
if (!(alt instanceof AltAST)) continue;
AltAST altAST = (AltAST) alt;
if (altAST.getChildCount() == 1) {
Tree e = altAST.getChild(0);
if (e.getType() == ANTLRParser.WILDCARD) {
return true;
}
}
}
return false;
}
/**
*
*
* <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 void setAltASTPointers(LeftRecursiveRule r, RuleAST t) {
// System.out.println("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.size(); i++) {
LeftRecursiveRuleAltInfo altInfo = r.recPrimaryAlts.get(i);
altInfo.altAST = (AltAST) primaryBlk.getChild(i);
altInfo.altAST.leftRecursiveAltInfo = altInfo;
altInfo.originalAltAST.leftRecursiveAltInfo = altInfo;
// altInfo.originalAltAST.parent = altInfo.altAST.parent;
// System.out.println(altInfo.altAST.toStringTree());
}
for (int i = 0; i < r.recOpAlts.size(); 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.out.println(altInfo.altAST.toStringTree());
}
}