1 | package de.ugoe.cs.swe.bnftools.ui.formatter;
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2 |
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3 | import java.util.ArrayList;
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4 |
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5 | import org.eclipse.emf.ecore.EObject;
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6 | import org.eclipse.xtext.parsetree.AbstractNode;
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7 | import org.eclipse.xtext.parsetree.CompositeNode;
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8 | import org.eclipse.xtext.parsetree.LeafNode;
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9 | import org.eclipse.xtext.parsetree.NodeUtil;
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10 |
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11 | import de.ugoe.cs.swe.bnftools.ebnf.Atom;
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12 | import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry;
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13 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
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14 | import de.ugoe.cs.swe.bnftools.ebnf.DeltaEntry;
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15 | import de.ugoe.cs.swe.bnftools.ebnf.EtsiBnf;
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16 | import de.ugoe.cs.swe.bnftools.ebnf.ExtRule;
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17 | import de.ugoe.cs.swe.bnftools.ebnf.GlobalCombinator;
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18 | import de.ugoe.cs.swe.bnftools.ebnf.GroupedSequence;
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19 | import de.ugoe.cs.swe.bnftools.ebnf.HookCombinator;
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20 | import de.ugoe.cs.swe.bnftools.ebnf.Import;
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21 | import de.ugoe.cs.swe.bnftools.ebnf.ImportSection;
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22 | import de.ugoe.cs.swe.bnftools.ebnf.MergeEntry;
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23 | import de.ugoe.cs.swe.bnftools.ebnf.MergeRule;
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24 | import de.ugoe.cs.swe.bnftools.ebnf.OptionalSequence;
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25 | import de.ugoe.cs.swe.bnftools.ebnf.RepeatedSequence;
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26 | import de.ugoe.cs.swe.bnftools.ebnf.Rule;
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27 | import de.ugoe.cs.swe.bnftools.ebnf.RuleCombinator;
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28 | import de.ugoe.cs.swe.bnftools.ebnf.RuleReference;
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29 | import de.ugoe.cs.swe.bnftools.ebnf.SectionHeading;
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30 | import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition;
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31 | import de.ugoe.cs.swe.bnftools.ebnf.StringRule;
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32 | import de.ugoe.cs.swe.bnftools.ebnf.Term;
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33 | import de.ugoe.cs.swe.bnftools.visitor.EbnfVisitor;
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34 |
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35 | public class EbnfFormatterVisitor extends EbnfVisitor {
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36 | private StringBuffer buf;
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37 | private FormatterConfig config;
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38 | private int bufferPosition = 0;
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39 | private int bufferPositionOriginalText = 0;
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40 | private int allCommentsPosition = 0;
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41 | private ArrayList<LeafNode> allComments = new ArrayList<LeafNode>();
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42 |
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43 | private boolean lastWasSectionHeading=false;
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44 | private CompositeNode parserEtsiBnfNode;
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45 | private String originalText;
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46 | private int bufferPositionFormattedText;
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47 | private String formattedText;
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48 | private String bufNoWhitespaces;
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49 | private String originalTextNoWhitespaces;
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50 |
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51 | public EbnfFormatterVisitor(EObject rootNode, FormatterConfig config) {
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52 | super(rootNode);
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53 | this.config = config;
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54 | buf = new StringBuffer();
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55 | }
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56 |
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57 | public EbnfFormatterVisitor(FormatterConfig config) {
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58 | this.config = config;
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59 | buf = new StringBuffer();
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60 | }
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61 |
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62 | public StringBuffer getBuf() {
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63 | return buf;
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64 | }
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65 |
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66 | private boolean isCommentNode(LeafNode node) {
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67 | if ((node.getText().trim().startsWith("//") || node.getText().trim().startsWith("/*")) && (node.isHidden()))
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68 | return true;
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69 | return false;
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70 | }
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71 |
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72 | private void collectAllComments(CompositeNode node) {
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73 | for (int i=0; i < node.getChildren().size(); i++) {
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74 | AbstractNode currentNode = node.getChildren().get(i);
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75 | if (currentNode instanceof LeafNode) {
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76 | LeafNode leafNode = (LeafNode) currentNode;
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77 | if (isCommentNode(leafNode)) {
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78 | allComments.add(leafNode);
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79 | }
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80 | }
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81 |
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82 | if (currentNode instanceof CompositeNode) {
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83 | collectAllComments((CompositeNode) currentNode);
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84 | }
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85 | }
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86 | }
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87 |
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88 | private boolean isSingleLineComment(String str) {
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89 | if (str.startsWith("//"))
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90 | return true;
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91 | return false;
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92 | }
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93 |
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94 | private boolean isMultiLineComment(String str) {
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95 | if (str.startsWith("/*"))
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96 | return true;
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97 | return false;
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98 | }
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99 |
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100 | private boolean isWhitespace(char ch) {
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101 | if ((ch==' ') || (ch == '\t') || (ch == '\n') || (ch == '\r'))
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102 | return true;
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103 | return false;
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104 | }
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105 |
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106 | private void skipWhitespacesOriginalText() {
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107 | while (isWhitespace(originalText.charAt(bufferPositionOriginalText))) {
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108 | bufferPositionOriginalText++;
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109 | }
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110 | }
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111 |
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112 | private void skipWhitespacesFormattedText(StringBuffer result) {
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113 | while (isWhitespace(formattedText.charAt(bufferPositionFormattedText))) {
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114 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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115 | bufferPositionFormattedText++;
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116 | }
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117 | }
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118 |
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119 | private boolean isSingleLineCommentNext(String str, int position) {
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120 | if ((str.charAt(position) == '/') && (str.charAt(position) == '/'))
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121 | return true;
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122 | return false;
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123 | }
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124 |
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125 | private boolean isMultiLineCommentNext(String str, int position) {
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126 | if ((str.charAt(position) == '/') && (str.charAt(position) == '*'))
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127 | return true;
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128 | return false;
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129 | }
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130 |
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131 | private boolean isCommentNext(String str, int position) {
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132 | if (isSingleLineCommentNext(str, position) || isMultiLineCommentNext(str, position))
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133 | return true;
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134 | else
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135 | return false;
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136 | }
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137 |
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138 | private String scanBackWhitespaces(String str, int position) {
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139 | StringBuffer whiteSpaces = new StringBuffer();
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140 | int currentPosition = position;
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141 | while (isWhitespace(str.charAt(currentPosition))) {
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142 | whiteSpaces.append(str.charAt(currentPosition));
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143 | currentPosition--;
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144 | }
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145 | return whiteSpaces.toString();
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146 | }
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147 |
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148 | private String stripEndingNewline(String str) {
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149 | int position = str.length() - 1;
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150 | while ((str.charAt(position) == '\n') || (str.charAt(position) == '\r')) {
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151 | position--;
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152 | }
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153 | return str.substring(0, position + 1);
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154 | }
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155 |
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156 | private int scanBackNewlinesCount(String str, int position) {
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157 | int newLinesCount = 0;
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158 | int currentPosition = position;
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159 | while ((str.charAt(currentPosition) == '\n') || (str.charAt(currentPosition) == '\r')) {
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160 | if (str.charAt(currentPosition) == '\n') {
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161 | if (str.charAt(currentPosition - 1) == '\r') {
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162 | currentPosition -= 2;
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163 | } else {
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164 | currentPosition -= 1;
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165 | }
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166 | newLinesCount++;
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167 | } else if (str.charAt(currentPosition) == '\r') {
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168 | currentPosition -= 1;
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169 | newLinesCount++;
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170 | }
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171 | }
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172 |
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173 | return newLinesCount;
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174 | }
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175 |
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176 | private void weaveComments() {
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177 | bufferPosition = 0;
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178 | bufferPositionOriginalText = 0;
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179 | bufferPositionFormattedText = 0;
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180 |
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181 | StringBuffer result = new StringBuffer();
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182 | bufNoWhitespaces = buf.toString().replaceAll("[ \t\n\r]", "");
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183 | formattedText = buf.toString();
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184 |
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185 | while (bufferPosition < bufNoWhitespaces.length()) {
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186 | skipWhitespacesOriginalText();
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187 | skipWhitespacesFormattedText(result);
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188 |
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189 | if (bufNoWhitespaces.charAt(bufferPosition) != originalText.charAt(bufferPositionOriginalText)) {
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190 | if (isCommentNext(originalText, bufferPositionOriginalText)) {
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191 | LeafNode currentComment = allComments.get(allCommentsPosition);
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192 | if (currentComment.getTotalOffset() == bufferPositionOriginalText) {
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193 | if (isMultiLineComment(currentComment.getText())) {
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194 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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195 | if (newLinesCount > 0) {
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196 | result.append(currentComment.getText());
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197 | result.append("\n");
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198 | } else {
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199 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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200 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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201 | result.append(" " + stripEndingNewline(currentComment.getText()));
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202 | result.append(lastWhiteSpaces);
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203 | }
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204 | } else if (isSingleLineComment(currentComment.getText())) {
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205 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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206 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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207 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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208 | if (newLinesCount > 0) {
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209 | result.append("\n\n" + stripEndingNewline(currentComment.getText()));
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210 | } else {
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211 | result.append(" " + stripEndingNewline(currentComment.getText()));
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212 | }
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213 | result.append(lastWhiteSpaces);
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214 | }
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215 | bufferPositionOriginalText+=currentComment.getLength();
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216 | allCommentsPosition++;
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217 | }
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218 | }
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219 | } else {
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220 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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221 |
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222 | bufferPositionOriginalText++;
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223 | bufferPositionFormattedText++;
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224 | bufferPosition++;
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225 | }
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226 | }
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227 | buf = result;
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228 |
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229 | }
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230 |
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231 |
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232 | // -----------------------------------------------------------------------------
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233 |
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234 | protected void visitBefore(EtsiBnf node) {
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235 | parserEtsiBnfNode = NodeUtil.getNodeAdapter(node).getParserNode();
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236 | collectAllComments(parserEtsiBnfNode);
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237 | originalText = NodeUtil.getNodeAdapter(node).getParserNode().serialize();
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238 | originalTextNoWhitespaces = originalText.replaceAll("[ \t\n\r]", "");
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239 |
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240 | //System.out.println(allComments.toString());
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241 | buf.append("grammar " + node.getName());
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242 | if (node.getType() != null)
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243 | buf.append(node.getType());
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244 | buf.append(";");
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245 |
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246 | buf.append("\n\n");
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247 | }
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248 |
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249 | protected void visitAfter(EtsiBnf node) {
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250 | weaveComments();
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251 | }
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252 |
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253 | protected void visitBefore(ImportSection node) {
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254 | }
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255 |
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256 | protected void visitAfter(ImportSection node) {
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257 | buf.append("\n");
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258 | }
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259 |
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260 | protected void visitBefore(BnfEntry node) {
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261 | }
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262 |
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263 | protected void visitAfter(BnfEntry node) {
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264 | }
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265 |
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266 | protected void visitBefore(DeltaEntry node) {
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267 | }
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268 |
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269 | protected void visitAfter(DeltaEntry node) {
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270 | }
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271 |
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272 | protected void visitBefore(MergeEntry node) {
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273 | }
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274 |
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275 | protected void visitAfter(MergeEntry node) {
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276 | }
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277 |
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278 | protected void visitBefore(Atom node) {
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279 | }
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280 |
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281 | protected void visitAfter(Atom node) {
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282 | }
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283 |
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284 | protected void visitBefore(Term node) {
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285 | }
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286 |
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287 | protected void visitAfter(Term node) {
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288 | if (!isLastElement())
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289 | buf.append(" ");
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290 | }
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291 |
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292 | protected void visitBefore(DefinitionList node) {
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293 | }
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294 |
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295 | protected void visitAfter(DefinitionList node) {
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296 | }
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297 |
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298 | protected void visitBefore(ExtRule node) {
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299 | }
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300 |
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301 | protected void visitAfter(ExtRule node) {
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302 | }
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303 |
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304 | protected void visitBefore(GlobalCombinator node) {
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305 | }
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306 |
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307 | protected void visitAfter(GlobalCombinator node) {
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308 | }
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309 |
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310 | protected void visitBefore(GroupedSequence node) {
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311 | buf.append("(");
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312 | }
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313 |
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314 | protected void visitAfter(GroupedSequence node) {
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315 | buf.append(")");
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316 | }
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317 |
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318 | protected void visitBefore(HookCombinator node) {
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319 | }
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320 |
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321 | protected void visitAfter(HookCombinator node) {
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322 | }
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323 |
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324 | protected void visitBefore(Import node) {
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325 | buf.append("import \"" + node.getImportURI() + "\";");
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326 | buf.append("\n");
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327 | }
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328 |
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329 | protected void visitAfter(Import node) {
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330 | }
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331 |
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332 | protected void visitBefore(MergeRule node) {
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333 | }
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334 |
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335 | protected void visitAfter(MergeRule node) {
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336 | }
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337 |
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338 | protected void visitBefore(OptionalSequence node) {
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339 | buf.append("[");
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340 | }
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341 |
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342 | protected void visitAfter(OptionalSequence node) {
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343 | buf.append("]");
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344 | }
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345 |
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346 | protected void visitBefore(RepeatedSequence node) {
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347 | buf.append("{");
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348 | }
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349 |
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350 | protected void visitAfter(RepeatedSequence node) {
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351 | buf.append("}");
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352 | if (node.isMorethanonce())
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353 | buf.append("+");
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354 | }
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355 |
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356 | protected void visitBefore(Rule node) {
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357 | if (lastWasSectionHeading)
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358 | buf.append("\n");
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359 |
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360 | lastWasSectionHeading=false;
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361 |
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362 | if (node.getRulenumber() > 0)
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363 | buf.append(node.getRulenumber() + ". ");
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364 |
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365 | buf.append(node.getName() + " ::= ");
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366 | }
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367 |
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368 | protected void visitAfter(Rule node) {
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369 | buf.append(";");
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370 | // appendComments(node);
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371 | buf.append("\n");
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372 | }
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373 |
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374 | protected void visitBefore(RuleCombinator node) {
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375 | }
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376 |
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377 | protected void visitAfter(RuleCombinator node) {
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378 | }
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379 |
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380 | protected void visitBefore(RuleReference node) {
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381 | buf.append(node.getRuleref().getName());
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382 | }
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383 |
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384 | protected void visitAfter(RuleReference node) {
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385 | }
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386 |
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387 | protected void visitBefore(SectionHeading node) {
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388 | if (!lastWasSectionHeading && !buf.substring(buf.length()-2).equals("\n\n"))
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389 | buf.append("\n");
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390 |
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391 | lastWasSectionHeading=true;
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392 | // if (!lastWasSectionHeading || !buf.substring(buf.length()-2).equals("\n\n"))
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393 | // if (!buf.substring(buf.length()-2).equals("\n\n"))
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394 | // buf.append("\n");
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395 |
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396 | buf.append(node.getSectionHeader());
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397 | }
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398 |
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399 | protected void visitAfter(SectionHeading node) {
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400 | // buf.append("\n");
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401 | }
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402 |
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403 | protected void visitBefore(SingleDefinition node) {
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404 | }
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405 |
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406 | protected void visitAfter(SingleDefinition node) {
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407 | if (!isLastElement())
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408 | buf.append(" | ");
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409 |
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410 | }
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411 |
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412 | protected void visitBefore(StringRule node) {
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413 | if (node.getLiteral() != null)
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414 | buf.append("\"" + node.getLiteral() + "\"");
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415 | else if (node.getColon() != null)
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416 | buf.append("\"\"\"");
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417 | }
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418 |
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419 | protected void visitAfter(StringRule node) {
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420 | }
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421 |
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422 |
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423 |
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424 | }
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