1 abstract class Token |
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2 case object T_SEMI extends Token |
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3 case object T_LPAREN extends Token |
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4 case object T_RPAREN extends Token |
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5 case class T_ID(s: String) extends Token |
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6 case class T_OP(s: String) extends Token |
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7 case class T_NUM(n: Int) extends Token |
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8 case class T_KWD(s: String) extends Token |
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9 case class T_STR(s: String) extends Token |
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10 |
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11 |
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12 // Loops program |
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13 //=============== |
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14 |
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15 /* |
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16 start := 1000; |
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17 x := start; |
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18 y := start; |
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19 z := start; |
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20 while 0 < x do { |
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21 while 0 < y do { |
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22 while 0 < z do { z := z - 1 }; |
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23 z := start; |
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24 y := y - 1 |
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25 }; |
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26 y := start; |
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27 x := x - 1 |
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28 } |
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29 */ |
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30 |
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31 val loops = |
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32 List(T_ID("start"), T_OP(":="), T_NUM(1000), T_SEMI, T_ID("x"), T_OP(":="), |
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33 T_ID("start"), T_SEMI, T_ID("y"), T_OP(":="), T_ID("start"), T_SEMI, |
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34 T_ID("z"), T_OP(":="), T_ID("start"), T_SEMI, T_KWD("while"), T_NUM(0), |
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35 T_OP("<"), T_ID("x"), T_KWD("do"), T_LPAREN, T_KWD("while"), T_NUM(0), |
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36 T_OP("<"), T_ID("y"), T_KWD("do"), T_LPAREN, T_KWD("while"), T_NUM(0), |
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37 T_OP("<"), T_ID("z"), T_KWD("do"), T_LPAREN, T_ID("z"), T_OP(":="), |
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38 T_ID("z"), T_OP("-"), T_NUM(1), T_RPAREN, T_SEMI, T_ID("z"), T_OP(":="), |
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39 T_ID("start"), T_SEMI, T_ID("y"), T_OP(":="), T_ID("y"), T_OP("-"), |
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40 T_NUM(1), T_RPAREN, T_SEMI, T_ID("y"), T_OP(":="), T_ID("start"), |
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41 T_SEMI, T_ID("x"), T_OP(":="), T_ID("x"), T_OP("-"), T_NUM(1), T_RPAREN) |
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42 |
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43 |
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44 |
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45 |
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46 // Fib program |
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47 //============= |
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48 |
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49 /* |
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50 write "Fib"; |
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51 read n; |
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52 minus1 := 0; |
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53 minus2 := 1; |
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54 while n > 0 do { |
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55 temp := minus2; |
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56 minus2 := minus1 + minus2; |
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57 minus1 := temp; |
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58 n := n - 1 |
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59 }; |
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60 write "Result"; |
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61 write minus2 |
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62 */ |
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63 |
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64 val fib = |
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65 List(T_KWD("write"), T_STR("Fib"), T_SEMI, T_KWD("read"), T_ID("n"), |
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66 T_SEMI, T_ID("minus1"), T_OP(":="), T_NUM(0), T_SEMI, T_ID("minus2"), |
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67 T_OP(":="), T_NUM(1), T_SEMI, T_KWD("while"), T_ID("n"), T_OP(">"), |
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68 T_NUM(0), T_KWD("do"), T_LPAREN, T_ID("temp"), T_OP(":="), |
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69 T_ID("minus2"), T_SEMI, T_ID("minus2"), T_OP(":="), T_ID("minus1"), |
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70 T_OP("+"), T_ID("minus2"), T_SEMI, T_ID("minus1"), T_OP(":="), |
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71 T_ID("temp"), T_SEMI, T_ID("n"), T_OP(":="), T_ID("n"), T_OP("-"), |
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72 T_NUM(1), T_RPAREN, T_SEMI, T_KWD("write"), T_STR("Result"), T_SEMI, |
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73 T_KWD("write"), T_ID("minus2")) |
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74 |
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75 |
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76 |
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77 // Factors program |
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78 //================= |
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79 |
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80 /* |
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81 write "Input n please"; |
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82 read n; |
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83 write "The factors of n are"; |
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84 f := 2; |
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85 while n != 1 do { |
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86 while (n / f) * f == n do { |
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87 write f; |
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88 n := n / f |
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89 }; |
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90 f := f + 1 |
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91 } |
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92 */ |
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93 |
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94 val factors = |
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95 List(T_KWD("write"), T_STR("Input n please"), T_SEMI, T_KWD("read"), |
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96 T_ID("n"), T_SEMI, T_KWD("write"), T_STR("The factors of n are"), |
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97 T_SEMI, T_ID("f"), T_OP(":="), T_NUM(2), T_SEMI, T_KWD("while"), |
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98 T_ID("n"), T_OP("!="), T_NUM(1), T_KWD("do"), T_LPAREN, |
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99 T_KWD("while"), T_ID("n"), T_OP("/"), T_ID("f"), T_OP("*"), |
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100 T_ID("f"), T_OP("=="), T_ID("n"), T_KWD("do"), T_LPAREN, |
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101 T_KWD("write"), T_ID("f"), T_SEMI, T_ID("n"), T_OP(":="), |
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102 T_ID("n"), T_OP("/"), T_ID("f"), T_RPAREN, T_SEMI, T_ID("f"), |
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103 T_OP(":="), T_ID("f"), T_OP("+"), T_NUM(1), T_RPAREN) |
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104 |
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105 |
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106 // Primes program |
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107 //================ |
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108 |
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109 /* |
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110 end := 100; |
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111 n := 2; |
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112 while (n < end) do { |
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113 f := 2; |
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114 tmp := 0; |
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115 while ((f < n / 2 + 1) && (tmp == 0)) do { |
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116 if ((n / f) * f == n) then { tmp := 1 } else { skip }; |
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117 f := f + 1 |
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118 }; |
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119 if (tmp == 0) then { write(n) } else { skip }; |
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120 n := n + 1 |
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121 } |
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122 */ |
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123 |
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124 val primes = |
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125 List(T_ID("end"), T_OP(":="), T_NUM(100), T_SEMI, T_ID("n"), T_OP(":="), |
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126 T_NUM(2), T_SEMI, T_KWD("while"), T_ID("n"), T_OP("<"), T_ID("end"), |
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127 T_KWD("do"), T_LPAREN, T_ID("f"), T_OP(":="), T_NUM(2), T_SEMI, |
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128 T_ID("tmp"), T_OP(":="), T_NUM(0), T_SEMI, T_KWD("while"), T_ID("f"), |
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129 T_OP("<"), T_ID("n"), T_OP("/"), T_NUM(2), T_OP("+"), T_NUM(1), |
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130 T_OP("&&"), T_ID("tmp"), T_OP("=="), T_NUM(0), T_KWD("do"), T_LPAREN, |
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131 T_KWD("if"), T_ID("n"), T_OP("/"), T_ID("f"), T_OP("*"), T_ID("f"), |
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132 T_OP("=="), T_ID("n"), T_KWD("then"), T_LPAREN, T_ID("tmp"), T_OP(":="), |
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133 T_NUM(1), T_RPAREN, T_KWD("else"), T_LPAREN, T_KWD("skip"), T_RPAREN, |
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134 T_SEMI, T_ID("f"), T_OP(":="), T_ID("f"), T_OP("+"), T_NUM(1), |
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135 T_RPAREN, T_SEMI, T_KWD("if"), T_ID("tmp"), T_OP("=="), T_NUM(0), |
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136 T_KWD("then"), T_LPAREN, T_KWD("write"), T_ID("n"), T_RPAREN, |
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137 T_KWD("else"), T_LPAREN, T_KWD("skip"), T_RPAREN, T_SEMI, T_ID("n"), |
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138 T_OP(":="), T_ID("n"), T_OP("+"), T_NUM(1), T_RPAREN) |
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