1 | // This file is part of PyANTLR. See LICENSE.txt for license |
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2 | // details..........Copyright (C) Wolfgang Haefelinger, 2004. |
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3 | // |
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4 | // $Id$ |
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5 | |
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6 | // |
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7 | // Pascal Tree Super Grammar (symtab.g derives from this) |
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8 | // |
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9 | // Adapted from, |
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10 | // Pascal User Manual And Report (Second Edition-1978) |
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11 | // Kathleen Jensen - Niklaus Wirth |
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12 | // |
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13 | // By |
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14 | // |
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15 | // Hakki Dogusan dogusanh@tr-net.net.tr |
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16 | // |
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17 | // Then significantly enhanced by Piet Schoutteten |
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18 | // with some guidance by Terence Parr. Piet added tree |
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19 | // construction, and some tree walkers. |
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20 | // |
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21 | |
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22 | options { |
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23 | language=Python; |
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24 | } |
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25 | |
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26 | class pascal_w extends TreeParser; |
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27 | |
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28 | options { |
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29 | importVocab = Pascal; |
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30 | ASTLabelType = "pascal.PascalAST"; |
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31 | } |
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32 | |
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33 | program |
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34 | : programHeading |
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35 | block |
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36 | ; |
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37 | |
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38 | programHeading |
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39 | : #(PROGRAM IDENT identifierList) |
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40 | | #(UNIT IDENT) |
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41 | ; |
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42 | |
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43 | identifier |
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44 | : IDENT |
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45 | ; |
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46 | |
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47 | block |
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48 | : ( labelDeclarationPart |
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49 | | constantDefinitionPart |
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50 | | typeDefinitionPart |
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51 | | variableDeclarationPart |
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52 | | procedureAndFunctionDeclarationPart |
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53 | | usesUnitsPart |
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54 | | IMPLEMENTATION |
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55 | )* |
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56 | compoundStatement |
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57 | ; |
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58 | |
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59 | usesUnitsPart |
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60 | : #(USES identifierList) |
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61 | ; |
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62 | |
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63 | labelDeclarationPart |
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64 | : #(LABEL ( label )+) |
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65 | ; |
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66 | |
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67 | label |
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68 | : NUM_INT |
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69 | ; |
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70 | |
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71 | constantDefinitionPart |
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72 | : #(CONST ( constantDefinition )+ ) |
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73 | ; |
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74 | |
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75 | constantDefinition |
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76 | : #(EQUAL IDENT constant) |
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77 | ; |
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78 | |
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79 | constant |
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80 | : NUM_INT |
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81 | | NUM_REAL |
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82 | | #( PLUS |
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83 | ( NUM_INT |
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84 | | NUM_REAL |
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85 | | IDENT |
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86 | ) |
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87 | ) |
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88 | | #( MINUS |
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89 | ( NUM_INT |
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90 | | NUM_REAL |
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91 | | IDENT |
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92 | ) |
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93 | ) |
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94 | | IDENT |
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95 | | STRING_LITERAL |
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96 | | #(CHR (NUM_INT|NUM_REAL)) |
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97 | ; |
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98 | |
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99 | string |
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100 | : STRING_LITERAL |
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101 | ; |
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102 | |
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103 | typeDefinitionPart |
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104 | : #(TYPE ( typeDefinition )+) |
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105 | ; |
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106 | |
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107 | typeDefinition |
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108 | : #(TYPEDECL IDENT |
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109 | ( type |
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110 | | #(FUNCTION (formalParameterList)? resultType) |
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111 | | #(PROCEDURE (formalParameterList)?) |
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112 | ) |
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113 | ) |
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114 | ; |
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115 | |
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116 | type |
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117 | : #(SCALARTYPE identifierList) |
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118 | | #(DOTDOT constant constant) |
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119 | | typeIdentifier |
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120 | | structuredType |
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121 | | #(POINTER typeIdentifier) |
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122 | ; |
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123 | |
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124 | typeIdentifier |
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125 | : IDENT |
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126 | | CHAR |
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127 | | BOOLEAN |
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128 | | INTEGER |
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129 | | REAL |
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130 | | #( STRING |
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131 | ( IDENT |
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132 | | NUM_INT |
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133 | | NUM_REAL |
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134 | | |
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135 | ) |
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136 | ) |
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137 | ; |
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138 | |
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139 | structuredType |
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140 | : #(PACKED unpackedStructuredType) |
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141 | | unpackedStructuredType |
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142 | ; |
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143 | |
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144 | unpackedStructuredType |
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145 | : arrayType |
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146 | | recordType |
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147 | | setType |
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148 | | fileType |
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149 | ; |
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150 | |
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151 | /** Note here that the syntactic diff between brackets disappears. |
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152 | * If the brackets mean different things semantically, we need |
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153 | * two different alternatives here. |
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154 | */ |
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155 | arrayType |
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156 | : #(ARRAY typeList type) |
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157 | ; |
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158 | |
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159 | typeList |
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160 | : #( TYPELIST ( type )+ ) |
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161 | ; |
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162 | |
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163 | recordType |
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164 | : #(RECORD fieldList) |
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165 | ; |
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166 | |
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167 | fieldList |
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168 | : #( FIELDLIST |
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169 | ( fixedPart ( variantPart )? |
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170 | | variantPart |
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171 | ) |
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172 | ) |
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173 | ; |
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174 | |
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175 | fixedPart |
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176 | : ( recordSection )+ |
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177 | ; |
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178 | |
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179 | recordSection |
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180 | : #(FIELD identifierList type) |
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181 | ; |
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182 | |
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183 | variantPart |
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184 | : #( CASE tag ( variant )+ ) |
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185 | ; |
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186 | |
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187 | tag |
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188 | : #(VARIANT_TAG identifier typeIdentifier) |
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189 | | #(VARIANT_TAG_NO_ID typeIdentifier) |
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190 | ; |
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191 | |
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192 | variant |
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193 | : #(VARIANT_CASE constList fieldList) |
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194 | ; |
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195 | |
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196 | setType |
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197 | : #(SET type) |
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198 | ; |
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199 | |
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200 | fileType |
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201 | : #(FILE (type)?) |
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202 | ; |
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203 | |
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204 | /** Yields a list of VARDECL-rooted subtrees with VAR at the overall root */ |
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205 | variableDeclarationPart |
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206 | : #( VAR ( variableDeclaration )+ ) |
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207 | ; |
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208 | |
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209 | variableDeclaration |
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210 | : #(VARDECL identifierList type) |
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211 | ; |
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212 | |
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213 | procedureAndFunctionDeclarationPart |
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214 | : procedureOrFunctionDeclaration |
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215 | ; |
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216 | |
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217 | procedureOrFunctionDeclaration |
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218 | : procedureDeclaration |
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219 | | functionDeclaration |
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220 | ; |
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221 | |
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222 | procedureDeclaration |
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223 | : #(PROCEDURE IDENT (formalParameterList)? block ) |
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224 | ; |
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225 | |
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226 | formalParameterList |
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227 | : #(ARGDECLS ( formalParameterSection )+) |
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228 | ; |
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229 | |
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230 | formalParameterSection |
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231 | : parameterGroup |
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232 | | #(VAR parameterGroup) |
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233 | | #(FUNCTION parameterGroup) |
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234 | | #(PROCEDURE parameterGroup) |
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235 | ; |
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236 | |
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237 | parameterGroup |
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238 | : #(ARGDECL identifierList typeIdentifier) |
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239 | ; |
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240 | |
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241 | identifierList |
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242 | : #(IDLIST (IDENT)+) |
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243 | ; |
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244 | |
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245 | constList |
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246 | : #(CONSTLIST ( constant )+) |
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247 | ; |
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248 | |
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249 | functionDeclaration |
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250 | : #(FUNCTION IDENT (formalParameterList)? resultType block) |
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251 | ; |
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252 | |
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253 | resultType |
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254 | : typeIdentifier |
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255 | ; |
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256 | |
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257 | statement |
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258 | : #(COLON label unlabelledStatement) |
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259 | | unlabelledStatement |
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260 | ; |
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261 | |
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262 | unlabelledStatement |
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263 | : simpleStatement |
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264 | | structuredStatement |
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265 | ; |
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266 | |
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267 | simpleStatement |
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268 | : assignmentStatement |
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269 | | procedureStatement |
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270 | | gotoStatement |
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271 | ; |
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272 | |
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273 | assignmentStatement |
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274 | : #(ASSIGN variable expression) |
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275 | ; |
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276 | |
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277 | /** A variable is an id with a suffix and can look like: |
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278 | * id |
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279 | * id[expr,...] |
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280 | * id.id |
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281 | * id.id[expr,...] |
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282 | * id^ |
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283 | * id^.id |
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284 | * id^.id[expr,...] |
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285 | * ... |
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286 | * |
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287 | * LL has a really hard time with this construct as it's naturally |
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288 | * left-recursive. We have to turn into a simple loop rather than |
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289 | * recursive loop, hence, the suffixes. I keep in the same rule |
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290 | * for easy tree construction. |
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291 | */ |
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292 | variable |
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293 | : #(LBRACK variable (expression)+) |
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294 | | #(LBRACK2 variable (expression)+) |
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295 | | #(DOT variable IDENT) |
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296 | | #(POINTER variable) |
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297 | | #(AT IDENT) |
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298 | | IDENT |
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299 | ; |
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300 | |
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301 | expression |
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302 | : #(EQUAL expression expression) |
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303 | | #(NOT_EQUAL expression expression) |
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304 | | #(LT expression expression) |
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305 | | #(LE expression expression) |
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306 | | #(GE expression expression) |
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307 | | #(GT expression expression) |
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308 | | #(IN expression expression) |
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309 | | #(PLUS expression (expression)?) |
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310 | | #(MINUS expression (expression)?) |
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311 | | #(OR expression expression) |
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312 | | #(STAR expression expression) |
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313 | | #(SLASH expression expression) |
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314 | | #(DIV expression expression) |
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315 | | #(MOD expression expression) |
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316 | | #(AND expression expression) |
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317 | | #(NOT expression) |
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318 | | variable |
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319 | | functionDesignator |
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320 | | set |
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321 | | NUM_INT |
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322 | | NUM_REAL |
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323 | | #(CHR (NUM_INT|NUM_REAL)) |
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324 | | string |
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325 | | NIL |
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326 | ; |
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327 | |
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328 | functionDesignator |
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329 | : #(FUNC_CALL IDENT (parameterList)?) |
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330 | ; |
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331 | |
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332 | parameterList |
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333 | : #( ARGLIST (actualParameter)+ ) |
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334 | ; |
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335 | |
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336 | set |
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337 | : #(SET (element)*) |
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338 | ; |
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339 | |
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340 | element |
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341 | : #(DOTDOT expression expression) |
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342 | | expression |
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343 | ; |
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344 | |
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345 | procedureStatement |
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346 | : #(PROC_CALL IDENT ( parameterList )?) |
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347 | ; |
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348 | |
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349 | actualParameter |
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350 | : expression |
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351 | ; |
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352 | |
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353 | gotoStatement |
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354 | : #(GOTO label) |
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355 | ; |
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356 | |
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357 | structuredStatement |
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358 | : compoundStatement |
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359 | | conditionalStatement |
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360 | | repetetiveStatement |
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361 | | withStatement |
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362 | ; |
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363 | |
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364 | compoundStatement |
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365 | : statements |
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366 | ; |
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367 | |
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368 | statements |
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369 | : #(BLOCK (statement)*) |
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370 | ; |
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371 | |
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372 | conditionalStatement |
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373 | : ifStatement |
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374 | | caseStatement |
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375 | ; |
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376 | |
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377 | ifStatement |
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378 | : #(IF expression statement (statement)?) |
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379 | ; |
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380 | |
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381 | caseStatement //pspsps ??? |
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382 | : #(CASE expression |
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383 | ( caseListElement )+ |
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384 | ( statements )? |
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385 | ) |
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386 | ; |
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387 | |
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388 | caseListElement |
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389 | : #(COLON constList statement) |
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390 | ; |
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391 | |
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392 | repetetiveStatement |
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393 | : whileStatement |
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394 | | repeatStatement |
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395 | | forStatement |
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396 | ; |
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397 | |
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398 | whileStatement |
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399 | : #(WHILE expression statement) |
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400 | ; |
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401 | |
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402 | repeatStatement |
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403 | : #(REPEAT statements expression) |
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404 | ; |
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405 | |
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406 | forStatement |
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407 | : #(FOR IDENT forList statement) |
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408 | ; |
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409 | |
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410 | forList |
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411 | : #(TO initialValue finalValue) |
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412 | | #(DOWNTO initialValue finalValue) |
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413 | ; |
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414 | |
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415 | initialValue |
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416 | : expression |
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417 | ; |
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418 | |
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419 | finalValue |
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420 | : expression |
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421 | ; |
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422 | |
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423 | withStatement |
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424 | : #(WITH recordVariableList statement) |
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425 | ; |
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426 | |
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427 | recordVariableList |
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428 | : ( variable )+ |
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429 | ; |
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