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!752 static S rule = "If A likes B then A will greet B."; static S ifThenPattern = "If A then B."; static S fact = "John likes Paul."; static S toCheck = "John will greet Paul."; p { MultiMap ruleVars = singleCharacterVars(rule); assertEquals(2, l(ruleVars.keySet())); printStructure(ruleVars); match(ifThenPattern, rule); } static match(S pattern, S input) { MultiMap> vars = ); matchImpl(pattern, vars, 0, input, 0); } static void matchImpl(S pattern, Map> vars, int iPattern, S input, int iInput, Map values) { if (iPattern >= l(pattern)) { print("Match!"); ret; } vars } // a range of characters in a string sclass Range { int i, j; // i = from, j = to *() {} *(int *i, int *j) {} } static MultiMap singleCharacterVars(S s) { L tok = nlTok(s); int pos = 0; new MultiMap vars; for i over tok: { S t = tok.get(i); int nextPos = pos+l(t); if (l(t) == 1 && isUpperCaseLetter(t.charAt(0))) vars.put(t, new Range(pos, nextPos)); pos = nextPos; } ret (MultiMap) vars; }