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sbool lispMatch_debug; static Map lispMatch(Lisp pat, Lisp nl, Collection variables) { new Map matches; ret lispMatch_sub(pat, nl, variables, matches) ? matches : null; } static bool lispMatch_sub(Lisp pat, Lisp nl, Collection variables, Map m) { if (pat == null || nl == null) ret false; if (pat.isLeaf() && variables.contains(pat.head)) { if (lispMatch_debug) print("Var: " + pat.head + " => " + nl); ret lispMatch_putMatch(m, pat.head, nl); } if (neq(pat.head, nl.head)) ret false; // heads identical, proceed to children int n = pat.size(); if (n != nl.size()) ret false; for (int i = 0; i < n; i++) { if (lispMatch_debug) print("Sub " + i + ": " + pat.get(i) + " => " + nl.get(i)); if (!lispMatch_sub(pat.get(i), nl.get(i), variables, m)) false; } true; } static bool lispMatch_putMatch(Map matches, S key, Lisp val) { if (matches.containsKey(key)) { if (neq(matches.get(key), val)) false; //fail("multi-matching not implemented"); } matches.put(key, val); true; }