public void prefixTest1() // balanced parenthesis
{
String sg1 = "S -> S S|(S)|";
ContextFreeGrammar g = GrammarParser <char> .Parse(f1, sg1);
g = GrammarUtilities.getEquivalentCNF(g);
Assert.AreEqual(-2, GrammarUtilities.longestPrefixLength(g, "()(())()()")); // full
Assert.AreEqual("()(())".Length, GrammarUtilities.longestPrefixLength(g, "()(()))()()"));
Assert.AreEqual("()(())((((".Length, GrammarUtilities.longestPrefixLength(g, "()(())(((("));
Assert.AreEqual("".Length, GrammarUtilities.longestPrefixLength(g, ")(()()())"));
}
public void prefixTest2() // a^n b^n
{
String sg1 = "S->aSb|S X| X->cX";
ContextFreeGrammar g = GrammarParser <char> .Parse(f1, sg1);
g = GrammarUtilities.getEquivalentCNF(g);
Assert.AreEqual(-2, GrammarUtilities.longestPrefixLength(g, "aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbb")); // full
Assert.AreEqual("a".Length, GrammarUtilities.longestPrefixLength(g, "a"));
Assert.AreEqual("".Length, GrammarUtilities.longestPrefixLength(g, "b"));
Assert.AreEqual("aab".Length, GrammarUtilities.longestPrefixLength(g, "aab"));
Assert.AreEqual("aabb".Length, GrammarUtilities.longestPrefixLength(g, "aabbb"));
Assert.AreEqual("aaaaaaaaaaaabbbbbbbbbbbb".Length, GrammarUtilities.longestPrefixLength(g, "aaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbababc"));
}
public void prefixTest3() // balanced parenthesis () and {} Exercise 8.5
{
String sg1 = "S -> S S|(S)|{S}|";
ContextFreeGrammar g = GrammarParser <char> .Parse(f1, sg1);
g = GrammarUtilities.getEquivalentCNF(g);
Assert.AreEqual(-2, GrammarUtilities.longestPrefixLength(g, "(){()}")); // full
Assert.AreEqual("(){(".Length, GrammarUtilities.longestPrefixLength(g, "(){("));
Assert.AreEqual("()".Length, GrammarUtilities.longestPrefixLength(g, "()}"));
String sg2 = "S->A B| C D | A T | C U | S S T-> A B U->S D A->( B->) C->{ D->}";
g = GrammarParser <char> .Parse(f1, sg2);
g = GrammarUtilities.getEquivalentCNF(g);
Assert.AreEqual(-2, GrammarUtilities.longestPrefixLength(g, "(){()}")); // full
Assert.AreEqual("(){(".Length, GrammarUtilities.longestPrefixLength(g, "(){("));
Assert.AreEqual("()".Length, GrammarUtilities.longestPrefixLength(g, "()}"));
}