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1 "{ Package: 'stx:goodies/petitparser/islands' }"! |
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2 |
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3 !PPChoiceParser methodsFor:'*petitislands'! |
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4 |
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5 acceptsEpsilonOpenSet: set |
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6 set add: self. |
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7 ^ self children anySatisfy: [:e | e acceptsEpsilonOpenSet: set ]. |
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8 ! ! |
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9 |
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10 !PPContext methodsFor:'*petitislands'! |
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11 |
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12 waterPosition |
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13 ^ self globalAt: #waterPosition ifAbsentPut: [ nil ] |
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14 ! ! |
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15 |
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16 !PPContext methodsFor:'*petitislands'! |
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17 |
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18 waterPosition: position |
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19 ^ self globalAt: #waterPosition put: position |
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20 ! ! |
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21 |
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22 !PPDelegateParser methodsFor:'*petitislands'! |
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23 |
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24 acceptsEpsilon |
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25 ^ parser acceptsEpsilonOpenSet: (IdentitySet with: self). |
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26 ! ! |
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27 |
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28 !PPDelegateParser methodsFor:'*petitislands'! |
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29 |
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30 acceptsEpsilonOpenSet: set |
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31 (set includes: parser) ifFalse: [ |
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32 set add: parser. |
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33 ^ parser acceptsEpsilonOpenSet: set |
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34 ]. |
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35 ^ false |
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36 ! ! |
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37 |
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38 !PPEpsilonParser methodsFor:'*petitislands'! |
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39 |
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40 acceptsEpsilon |
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41 ^ true |
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42 ! ! |
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43 |
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44 !PPListParser methodsFor:'*petitislands'! |
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45 |
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46 acceptsEpsilon |
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47 ^ self acceptsEpsilonOpenSet: IdentitySet new. |
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48 ! ! |
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49 |
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50 !PPLiteralParser methodsFor:'*petitislands'! |
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51 |
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52 acceptsEpsilon |
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53 ^ false |
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54 ! ! |
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55 |
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56 !PPOptionalParser methodsFor:'*petitislands'! |
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57 |
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58 acceptsEpsilon |
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59 ^ true |
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60 ! ! |
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61 |
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62 !PPOptionalParser methodsFor:'*petitislands'! |
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63 |
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64 acceptsEpsilonOpenSet: set |
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65 ^ true |
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66 ! ! |
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67 |
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68 !PPParser methodsFor:'*petitislands'! |
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69 |
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70 acceptsEpsilon |
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71 "return true, if parser can accept epsilon without failure" |
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72 ^ self subclassResponsibility |
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73 ! ! |
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74 |
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75 !PPParser methodsFor:'*petitislands'! |
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76 |
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77 acceptsEpsilonOpenSet: set |
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78 "private helper for acceptsEmpsilon that makes sure to avoid cycles (using open set)" |
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79 self children isEmpty ifTrue: [ ^ self acceptsEpsilon ]. |
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80 |
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81 self shouldBeImplemented . |
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82 ! ! |
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83 |
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84 !PPParser methodsFor:'*petitislands'! |
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85 |
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86 island |
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87 ^ PPIsland new |
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88 island: self; |
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89 yourself; |
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90 memoized |
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91 ! ! |
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92 |
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93 !PPParser methodsFor:'*petitislands'! |
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94 |
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95 island: water |
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96 ^ PPIsland new |
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97 island: self; |
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98 water: water; |
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99 yourself; |
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100 memoized |
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101 ! ! |
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102 |
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103 !PPParser methodsFor:'*petitislands'! |
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104 |
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105 nextSets |
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106 | nextSets | |
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107 |
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108 nextSets := IdentityDictionary new. |
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109 self allParsersDo: [ :each | nextSets at: each put: IdentitySet new ]. |
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110 |
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111 (nextSets at: self) add: PPSentinel instance. |
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112 |
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113 [ | changed | |
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114 changed := false. |
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115 |
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116 nextSets keysAndValuesDo: [:parser :next | |
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117 changed := (parser |
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118 nextSets: nextSets |
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119 into: next) or: [ changed ]. |
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120 ]. |
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121 changed ] whileTrue. |
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122 |
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123 ^ nextSets |
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124 ! ! |
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125 |
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126 !PPParser methodsFor:'*petitislands'! |
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127 |
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128 nextSets: aNextDictionary into: aSet |
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129 "return true/false, if something has changed or not...." |
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130 | childSet change tally | |
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131 |
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132 change := false. |
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133 |
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134 self children do: [:each | |
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135 childSet := aNextDictionary at: each. |
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136 tally := childSet size. |
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137 childSet addAll: aSet. |
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138 change := change or: [ tally ~= childSet size ]. |
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139 ]. |
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140 |
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141 ^ change |
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142 |
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143 ! ! |
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144 |
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145 !PPPredicateParser methodsFor:'*petitislands'! |
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146 |
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147 acceptsEpsilon |
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148 ^ false |
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149 ! ! |
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150 |
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151 !PPRepeatingParser methodsFor:'*petitislands'! |
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152 |
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153 nextSets: aNextDictionary into: aSet |
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154 | tally childSet change | |
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155 |
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156 change := super nextSets: aNextDictionary into: aSet. |
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157 |
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158 childSet := aNextDictionary at: parser. |
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159 tally := aSet size. |
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160 childSet add: parser. |
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161 ^ change or: [ tally ~= aSet size ]. |
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162 ! ! |
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163 |
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164 !PPSequenceParser methodsFor:'*petitislands'! |
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165 |
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166 acceptsEpsilonOpenSet: set |
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167 set add: self. |
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168 ^ self children allSatisfy: [:e | e acceptsEpsilonOpenSet: set ] |
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169 ! ! |
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170 |
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171 !PPSequenceParser methodsFor:'*petitislands'! |
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172 |
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173 nextSets: aNextDictionary into: aSet |
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174 |
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175 | nextSet eachNextSet change tally | |
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176 nextSet := aSet copy. |
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177 |
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178 change := false. |
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179 |
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180 self children reverseDo: [:each | |
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181 eachNextSet := aNextDictionary at: each. |
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182 tally := eachNextSet size. |
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183 eachNextSet addAll: nextSet. |
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184 change := change or: [ tally ~= eachNextSet size ]. |
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185 |
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186 each acceptsEpsilon ifTrue: [ |
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187 nextSet add: each. |
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188 ] ifFalse: [ |
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189 nextSet := IdentitySet with: each. |
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190 ]. |
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191 ]. |
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192 |
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193 ^ change |
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194 ! ! |
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195 |
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196 !stx_goodies_petitparser_islands class methodsFor:'documentation'! |
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197 |
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198 extensionsVersion_HG |
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199 |
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200 ^ '$Changeset: <not expanded> $' |
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201 ! ! |