equal
deleted
inserted
replaced
24 case CHAR(d) => if (c == d) ONE else ZERO |
24 case CHAR(d) => if (c == d) ONE else ZERO |
25 case ALT(r1, r2) => ALT(der(c, r1), der(c, r2)) |
25 case ALT(r1, r2) => ALT(der(c, r1), der(c, r2)) |
26 case SEQ(r1, r2) => |
26 case SEQ(r1, r2) => |
27 if (nullable(r1)) ALT(SEQ(der(c, r1), r2), der(c, r2)) |
27 if (nullable(r1)) ALT(SEQ(der(c, r1), r2), der(c, r2)) |
28 else SEQ(der(c, r1), r2) |
28 else SEQ(der(c, r1), r2) |
29 case STAR(r) => SEQ(der(c, r), STAR(r)) |
29 case STAR(r1) => SEQ(der(c, r1), STAR(r1)) |
30 } |
30 } |
31 |
31 |
32 // derivative w.r.t. a string (iterates der) |
32 // derivative w.r.t. a string (iterates der) |
33 def ders (s: List[Char], r: Rexp) : Rexp = s match { |
33 def ders (s: List[Char], r: Rexp) : Rexp = s match { |
34 case Nil => r |
34 case Nil => r |
56 |
56 |
57 // the evil regular expression a?{n} a{n} |
57 // the evil regular expression a?{n} a{n} |
58 def EVIL1(n: Int) = SEQ(NTIMES(OPT(CHAR('a')), n), NTIMES(CHAR('a'), n)) |
58 def EVIL1(n: Int) = SEQ(NTIMES(OPT(CHAR('a')), n), NTIMES(CHAR('a'), n)) |
59 |
59 |
60 // the evil regular expression (a*)*b |
60 // the evil regular expression (a*)*b |
61 val EVIL2 = SEQ(STAR(CHAR('a')), CHAR('b')) |
61 val EVIL2 = SEQ(STAR(STAR(CHAR('a'))), CHAR('b')) |
62 |
62 |
63 //for measuring time |
63 //for measuring time |
64 def time_needed[T](i: Int, code: => T) = { |
64 def time_needed[T](i: Int, code: => T) = { |
65 val start = System.nanoTime() |
65 val start = System.nanoTime() |
66 for (j <- 1 to i) code |
66 for (j <- 1 to i) code |
76 for (i <- 1 to 20) { |
76 for (i <- 1 to 20) { |
77 println(i + ": " + "%.5f".format(time_needed(2, matches(EVIL1(i), "a" * i)))) |
77 println(i + ": " + "%.5f".format(time_needed(2, matches(EVIL1(i), "a" * i)))) |
78 } |
78 } |
79 |
79 |
80 //test: (a*)* b |
80 //test: (a*)* b |
81 for (i <- 1 to 6502 by 500) { |
81 for (i <- 1 to 20) { |
82 println(i + " " + "%.5f".format(time_needed(2, matches(EVIL2, "a" * i)))) |
82 println(i + " " + "%.5f".format(time_needed(2, matches(EVIL2, "a" * i)))) |
83 } |
83 } |
84 |
84 |
85 for (i <- 1 to 6502 by 500) { |
85 for (i <- 1 to 20) { |
86 println(i + " " + "%.5f".format(time_needed(2, matches(EVIL2, "a" * i)))) |
86 println(i + " " + "%.5f".format(time_needed(2, matches(EVIL2, "a" * i)))) |
87 } |
87 } |
88 |
88 |