85
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
1 |
// A parser and evaluator for the WHILE language
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
2 |
//
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85
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
3 |
import matcher._
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
4 |
import parser._
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
5 |
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66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
6 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
7 |
// some regular expressions
|
70
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
8 |
val SYM = RANGE("ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz_")
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68
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
9 |
val DIGIT = RANGE("0123456789")
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69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
10 |
val ID = SEQ(SYM, STAR(ALT(SYM, DIGIT)))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
11 |
val NUM = PLUS(DIGIT)
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
12 |
val KEYWORD = ALTS("skip", "while", "do", "if", "then", "else", "true", "false", "write")
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69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
13 |
val SEMI: Rexp = ";"
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80
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
14 |
val OP: Rexp = ALTS(":=", "=", "-", "+", "*", "!=", "<", ">")
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66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
15 |
val WHITESPACE = PLUS(RANGE(" \n"))
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
16 |
val RPAREN: Rexp = ")"
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
17 |
val LPAREN: Rexp = "("
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
18 |
val BEGIN: Rexp = "{"
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
19 |
val END: Rexp = "}"
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75
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
20 |
val COMMENT = SEQS("/*", NOT(SEQS(STAR(ALLC), "*/", STAR(ALLC))), "*/")
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66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
21 |
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70
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
22 |
// tokens for classifying the strings that have been recognised
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66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
23 |
abstract class Token
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
24 |
case object T_WHITESPACE extends Token
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75
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
25 |
case object T_COMMENT extends Token
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69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
26 |
case object T_SEMI extends Token
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
27 |
case object T_LPAREN extends Token
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
28 |
case object T_RPAREN extends Token
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
29 |
case object T_BEGIN extends Token
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
30 |
case object T_END extends Token
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
31 |
case class T_ID(s: String) extends Token
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
32 |
case class T_OP(s: String) extends Token
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
33 |
case class T_NUM(s: String) extends Token
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
34 |
case class T_KWD(s: String) extends Token
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
35 |
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85
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
36 |
val lexing_rules: List[(Rexp, List[Char] => Token)] =
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69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
37 |
List((KEYWORD, (s) => T_KWD(s.mkString)),
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
38 |
(ID, (s) => T_ID(s.mkString)),
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
39 |
(OP, (s) => T_OP(s.mkString)),
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
40 |
(NUM, (s) => T_NUM(s.mkString)),
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
41 |
(SEMI, (s) => T_SEMI),
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
42 |
(LPAREN, (s) => T_LPAREN),
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
43 |
(RPAREN, (s) => T_RPAREN),
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
44 |
(BEGIN, (s) => T_BEGIN),
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
45 |
(END, (s) => T_END),
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75
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
46 |
(WHITESPACE, (s) => T_WHITESPACE),
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
47 |
(COMMENT, (s) => T_COMMENT))
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66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
48 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
49 |
// the tokenizer
|
75
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
50 |
val Tok = Tokenizer(lexing_rules, List(T_WHITESPACE, T_COMMENT))
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
51 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
52 |
// the abstract syntax trees
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
53 |
abstract class Stmt
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
54 |
abstract class AExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
55 |
abstract class BExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
56 |
type Block = List[Stmt]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
57 |
case object Skip extends Stmt
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
58 |
case class If(a: BExp, bl1: Block, bl2: Block) extends Stmt
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
59 |
case class While(b: BExp, bl: Block) extends Stmt
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
60 |
case class Assign(s: String, a: AExp) extends Stmt
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
61 |
case class Write(s: String) extends Stmt
|
70
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
62 |
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
63 |
case class Var(s: String) extends AExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
64 |
case class Num(i: Int) extends AExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
65 |
case class Aop(o: String, a1: AExp, a2: AExp) extends AExp
|
70
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
66 |
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
67 |
case object True extends BExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
68 |
case object False extends BExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
69 |
case class Bop(o: String, a1: AExp, a2: AExp) extends BExp
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
70 |
|
70
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
71 |
// atomic parsers
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
72 |
case class TokParser(tok: Token) extends Parser[List[Token], Token] {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
73 |
def parse(ts: List[Token]) = ts match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
74 |
case t::ts if (t == tok) => Set((t, ts))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
75 |
case _ => Set ()
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
76 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
77 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
78 |
implicit def token2tparser(t: Token) = TokParser(t)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
79 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
80 |
case object NumParser extends Parser[List[Token], Int] {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
81 |
def parse(ts: List[Token]) = ts match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
82 |
case T_NUM(s)::ts => Set((s.toInt, ts))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
83 |
case _ => Set ()
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
84 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
85 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
86 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
87 |
case object IdParser extends Parser[List[Token], String] {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
88 |
def parse(ts: List[Token]) = ts match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
89 |
case T_ID(s)::ts => Set((s, ts))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
90 |
case _ => Set ()
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
91 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
92 |
}
|
66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
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|
93 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
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|
94 |
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
95 |
// arithmetic expressions
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
96 |
lazy val AExp: Parser[List[Token], AExp] =
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
97 |
(T ~ T_OP("+") ~ AExp) ==> { case ((x, y), z) => Aop("+", x, z): AExp } ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
98 |
(T ~ T_OP("-") ~ AExp) ==> { case ((x, y), z) => Aop("-", x, z): AExp } || T
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
99 |
lazy val T: Parser[List[Token], AExp] =
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
100 |
(F ~ T_OP("*") ~ T) ==> { case ((x, y), z) => Aop("*", x, z): AExp } || F
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
101 |
lazy val F: Parser[List[Token], AExp] =
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
102 |
(T_LPAREN ~> AExp <~ T_RPAREN) ||
|
70
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
103 |
IdParser ==> Var ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
104 |
NumParser ==> Num
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
105 |
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
106 |
// boolean expressions
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
107 |
lazy val BExp: Parser[List[Token], BExp] =
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
108 |
(T_KWD("true") ==> ((_) => True: BExp)) ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
109 |
(T_KWD("false") ==> ((_) => False: BExp)) ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
110 |
(T_LPAREN ~> BExp <~ T_RPAREN) ||
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
111 |
(AExp ~ T_OP("=") ~ AExp) ==> { case ((x, y), z) => Bop("=", x, z): BExp } ||
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
112 |
(AExp ~ T_OP("!=") ~ AExp) ==> { case ((x, y), z) => Bop("!=", x, z): BExp } ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
113 |
(AExp ~ T_OP("<") ~ AExp) ==> { case ((x, y), z) => Bop("<", x, z): BExp } ||
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
114 |
(AExp ~ T_OP(">") ~ AExp) ==> { case ((x, y), z) => Bop("<", z, x): BExp }
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
115 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
116 |
lazy val Stmt: Parser[List[Token], Stmt] =
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
117 |
(T_KWD("skip") ==> ((_) => Skip: Stmt)) ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
118 |
(IdParser ~ T_OP(":=") ~ AExp) ==> { case ((x, y), z) => Assign(x, z): Stmt } ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
119 |
(T_KWD("if") ~ BExp ~ T_KWD("then") ~ Block ~ T_KWD("else") ~ Block) ==>
|
71
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
120 |
{ case (((((x,y),z),u),v),w) => If(y, u, w): Stmt } ||
|
75
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
121 |
(T_KWD("while") ~ BExp ~ T_KWD("do") ~ Block) ==> { case (((x, y), z), w) => While(y, w) } ||
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
122 |
(T_KWD("write") ~ IdParser) ==> { case (x, y) => Write(y) }
|
75
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
123 |
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
124 |
lazy val Stmts: Parser[List[Token], Block] =
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
125 |
(Stmt ~ T_SEMI ~ Stmts) ==> { case ((x, y), z) => x :: z : Block } ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
126 |
(Stmt ==> ((s) => List(s) : Block))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
127 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
128 |
lazy val Block: Parser[List[Token], Block] =
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
129 |
(T_BEGIN ~> Stmts <~ T_END) ||
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
130 |
(Stmt ==> ((s) => List(s)))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
131 |
|
70
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
132 |
// interpreter
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
133 |
type Env = Map[String, Int]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
134 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
135 |
def eval_bexp(b: BExp, env: Env) : Boolean = b match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
136 |
case True => true
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
137 |
case False => false
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
138 |
case Bop("=", a1, a2) => eval_aexp(a1, env) == eval_aexp(a2, env)
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
139 |
case Bop("!=", a1, a2) => !(eval_aexp(a1, env) == eval_aexp(a2, env))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
140 |
case Bop("<", a1, a2) => eval_aexp(a1, env) < eval_aexp(a2, env)
|
66
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
141 |
}
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
142 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
143 |
def eval_aexp(a: AExp, env : Env) : Int = a match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
144 |
case Num(i) => i
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
145 |
case Var(s) => env(s)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
146 |
case Aop("+", a1, a2) => eval_aexp(a1, env) + eval_aexp(a2, env)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
147 |
case Aop("-", a1, a2) => eval_aexp(a1, env) - eval_aexp(a2, env)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
148 |
case Aop("*", a1, a2) => eval_aexp(a1, env) * eval_aexp(a2, env)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
149 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
150 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
151 |
def eval_stmt(s: Stmt, env: Env) : Env = s match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
152 |
case Skip => env
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
153 |
case Assign(x, a) => env + (x -> eval_aexp(a, env))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
154 |
case If(b, bl1, bl2) => if (eval_bexp(b, env)) eval_bl(bl1, env) else eval_bl(bl2, env)
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
155 |
case While(b, bl) =>
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
156 |
if (eval_bexp(b, env)) eval_stmt(While(b, bl), eval_bl(bl, env))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
157 |
else env
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
158 |
case Write(x) => { println(env(x)); env }
|
69
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
159 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
160 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
161 |
def eval_bl(bl: Block, env: Env) : Env = bl match {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
162 |
case Nil => env
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
163 |
case s::bl => eval_bl(bl, eval_stmt(s, env))
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
164 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
165 |
|
75
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
166 |
def eval_prog(name: String) : Env = {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
167 |
val tks = Tok.fromFile(name)
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
168 |
val ast = Stmts.parse_single(tks)
|
75
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
169 |
eval_bl(ast, Map.empty)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
170 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
171 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
172 |
|
72
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
173 |
//examples
|
75
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
174 |
|
80
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
175 |
//eval_prog("loops.while")
|
83
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
176 |
eval_prog("fib.while")
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
177 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
178 |
|
80
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
179 |
def time_needed[T](i: Int, code: => T) = {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
180 |
val start = System.nanoTime()
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
181 |
for (j <- 1 to i) code
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
182 |
val end = System.nanoTime()
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
183 |
(end - start)/(i * 1.0e9)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
184 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
185 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
186 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
187 |
val test_prog = """
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
188 |
start := XXX;
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
189 |
x := start;
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
190 |
y := start;
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
191 |
z := start;
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
192 |
while 0 < x do {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
193 |
while 0 < y do {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
194 |
while 0 < z do {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
195 |
z := z - 1
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
196 |
};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
197 |
z := start;
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
198 |
y := y - 1
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
199 |
};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
200 |
y := start;
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
201 |
x := x - 1
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
202 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
203 |
"""
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
204 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
205 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
206 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
207 |
def eval_test(n: Int) : Unit = {
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
208 |
val tks = Tok.fromString(test_prog.replaceAllLiterally("XXX", n.toString))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
209 |
val ast = Stmts.parse_single(tks)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
210 |
println(n + " " + time_needed(2, eval_bl(ast, Map.empty)))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
211 |
}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
212 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
213 |
List(1, 200, 400, 600, 800, 1000, 1200, 1400, 1600).map(eval_test(_))
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
214 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
215 |
|
76
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
216 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
217 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
218 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
219 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
220 |
|