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annotate code/mike00.lm @ 21:5a27dd6f03cd

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Added filter function
author Michael Pavone <pavone@retrodev.com>
date Fri, 25 Jul 2014 22:17:47 -0700
parents 5a36fda13a47
children edc89d9c9e10
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14
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1 #{
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2 length <- :lst {
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3 len <- []
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4 while: { not: (lst isInteger?)} do: {
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5 lst <- lst tail
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6 len <- len + 1
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7 }
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8 len
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9 }
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10
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11 reverse <- :lst {
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12 new <- []
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13 while: { not: (lst isInteger?)} do: {
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14 new <- (lst value) | new
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15 lst <- lst tail
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16 }
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17 new
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18 }
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19
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20 split:at <- :lst :pos {
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21 first <- []
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22 i <- 0
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23 while: { i < pos } do: {
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24 first <- (lst value) | first
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25 lst <- lst tail
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26 i <- i + 1
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27 }
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28 #[(reverse: first) lst]
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29 }
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30
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31 map <- :lst fun {
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32 new <- []
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33 while: { not: (lst isInteger?) } do: {
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34 new <- (fun: (lst value)) | new
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35 lst <- lst tail
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36 }
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37 reverse: new
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38 }
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39
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40 fold:with <- :lst acc :fun {
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41 while: { not: (lst isInteger?) } do: {
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42 acc <- fun: acc (lst value)
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43 lst <- lst tail
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44 }
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45 acc
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46 }
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47
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48 filter <- :lst pred {
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49 new <- []
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50 while: { not: (lst isInteger?) } do: {
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51 if: (pred: (lst value)) {
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52 new <- (lst value) | new
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53 } else: {}
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54 lst <- lst tail
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55 }
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56 reverse: new
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57 }
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58
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59 makeTree:size <- :lst :size {
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60 ret <- 0
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61 sub <- 0
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62 half <- size / 2
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63 if: size = 2 {
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64 ret <- #[(lst value) ((lst tail) value)]
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65 } else: {
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66 if: size = 1 {
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67 ret <- lst
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68 } else: {
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69 sub <- split: lst at: half
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70 ret <- #[
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71 (makeTree: (sub value) size: half)
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72 (makeTree: (sub tail) size: size-half)
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73 ]
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74 }
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75 }
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76 ret
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77 }
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78
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79 makeTree <- :lst {
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80 size <- lst length
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81 #[size (makeTree: lst size: size)]
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82 }
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83
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84 get:fromTree:size <- :idx :tree :size {
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85 print: #[1 tree size]
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86 ret <- 0
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87 half <- size / 2
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88 if: size <= 2 {
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89 if: idx = 0 {
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90 ret <- tree value
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91 } else: {
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92 ret <- tree tail
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93 }
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94 } else: {
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95 if: idx < half {
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96 ret <- get: idx fromTree: (tree value) size: half
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97 } else: {
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98 ret <- get: idx-half fromTree: (tree tail) size: size-half
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99 }
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100 }
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101 ret
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102 }
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103
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104 get:fromTree <- :idx :tree {
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105 size <- tree value
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106 print: #[0 size]
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107 get: idx fromTree: (tree tail) size: size
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108 }
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109
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110 treeMap:size <- :tree fun :size {
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111 ret <- 0
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112 half <- size / 2
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113 if: size = 2 {
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114 ret <- #[(fun: (tree value)) (fun: (tree tail))]
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115 } else: {
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116 if: size = 1 {
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117 ret <- #[(fun: (tree value)) 0]
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118 } else: {
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119 ret <- #[
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120 (treeMap: (tree value) fun size: half)
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121 (treeMap: (tree tail) fun size: size-half)
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122 ]
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123 }
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124 }
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125 ret
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126 }
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127
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128 treeMap <- :tree fun {
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129 #[(tree value) (treeMap: (tree tail) fun size: (tree value))]
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130 }
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131
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132 tree:size:set:to <- :tree :size :idx :val {
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133 ret <- 0
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134 half <- size / 2
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135 if: size = 2 {
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136 if: idx = 0 {
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137 ret <- #[val (tree tail)]
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138 } else: {
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139 ret <- #[(tree value) val]
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140 }
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141 } else: {
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142 if: size = 1 {
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143 ret <- #[val 0]
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144 } else: {
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145 if: (idx < half) {
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146 ret <- #[
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147 (tree: (tree value) size: half set: idx to: val)
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148 (tree tail)
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149 ]
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150 } else: {
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151 ret <- #[
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152 (tree value)
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153 (tree: (tree tail) size: size-half set: idx-half to: val)
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154 ]
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155 }
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156 }
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157 }
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158 ret
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159 }
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160
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161 tree:set:to <- :tree :idx :val {
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162 #[(tree value) (tree: (tree tail) size: (tree value) set: idx to: val)]
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163 }
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164
14
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165 height <- 0
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166 width <- 0
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167
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168 main <- {
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169 /* map <- initWorld value
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170 height <- map length
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171 width <- (map value) length
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172 */
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173
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174 lst <- [1 2 3 4 5 6 7 8 9]
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175 print: (length: lst)
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176 print: (map: lst :el { el + 1 })
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177 print: (split: lst at: (length: lst) / 2)
17
c33dce59ce3d Store tree size in outer node so it does not need to be manually passed in
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178 tree <- makeTree: lst
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179 print: tree
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180 print: (get: 0 fromTree: tree)
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181 print: (get: 6 fromTree: tree)
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182 print: (get: 8 fromTree: tree)
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8ff2349f36c6 Wrote treeMap function
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183 print: (treeMap: tree :el { el + 1 })
19
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184 print: (tree: tree set: 0 to: 42)
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185 print: (tree: tree set: 6 to: 42)
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186 print: (tree: tree set: 8 to: 42)
20
5a36fda13a47 Added fold:with function
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187 print: (fold: lst 0 with: :acc el { acc + el })
21
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188 print: (filter: lst :el { el > 4 })
14
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189 }
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190
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191 }