39 |
39 |
40 |
40 |
41 //optional: one or zero times |
41 //optional: one or zero times |
42 def OPT(r: Rexp) = ALT(r, EMPTY) |
42 def OPT(r: Rexp) = ALT(r, EMPTY) |
43 |
43 |
44 def EVIL(n: Int) = SEQ(NTIMES(OPT(CHAR('a')), n), NTIMES(CHAR('a'), n)) |
44 def EVIL1(n: Int) = SEQ(NTIMES(OPT(CHAR('a')), n), NTIMES(CHAR('a'), n)) |
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45 val EVIL2 = SEQ(STAR(CHAR('a')), CHAR('b')) |
45 |
46 |
46 def time_needed[T](i: Int, code: => T) = { |
47 def time_needed[T](i: Int, code: => T) = { |
47 val start = System.nanoTime() |
48 val start = System.nanoTime() |
48 for (j <- 1 to i) code |
49 for (j <- 1 to i) code |
49 val end = System.nanoTime() |
50 val end = System.nanoTime() |
50 (end - start)/(i * 1.0e9) |
51 (end - start)/(i * 1.0e9) |
51 } |
52 } |
52 |
53 |
53 //for (i <- 1 to 100) { |
54 //for (i <- 1 to 100) { |
54 // println(i + ": " + "%.5f".format(time_needed(1, matches(EVIL(i), "a" * i)))) |
55 // println(i + ": " + "%.5f".format(time_needed(1, matches(EVIL1(i), "a" * i)))) |
55 //} |
56 //} |
56 |
57 |
57 //a bit bolder test |
58 //a bit bolder test |
58 for (i <- 1 to 1000 by 50) { |
59 for (i <- 1 to 1000 by 50) { |
59 println(i + " " + "%.5f".format(time_needed(1, matches(EVIL(i), "a" * i)))) |
60 println(i + " " + "%.5f".format(time_needed(1, matches(EVIL1(i), "a" * i)))) |
60 } |
61 } |
61 |
62 |
62 |
63 |
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64 for (i <- 1 to 4002 by 500) { |
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65 println(i + " " + "%.5f".format(time_needed(4, matches(EVIL2, "a" * i)))) |
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66 } |
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67 |
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68 |