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 | import java.util.Stack;
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5 |
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6 | import org.eclipse.emf.ecore.EObject;
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7 | import org.eclipse.xtext.parsetree.AbstractNode;
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8 | import org.eclipse.xtext.parsetree.CompositeNode;
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9 | import org.eclipse.xtext.parsetree.LeafNode;
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10 | import org.eclipse.xtext.parsetree.NodeUtil;
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11 |
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12 | import de.ugoe.cs.swe.bnftools.ebnf.Atom;
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13 | import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry;
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14 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
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15 | import de.ugoe.cs.swe.bnftools.ebnf.DeltaEntry;
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16 | import de.ugoe.cs.swe.bnftools.ebnf.EtsiBnf;
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17 | import de.ugoe.cs.swe.bnftools.ebnf.ExtRule;
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18 | import de.ugoe.cs.swe.bnftools.ebnf.GlobalCombinator;
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19 | import de.ugoe.cs.swe.bnftools.ebnf.GroupedSequence;
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20 | import de.ugoe.cs.swe.bnftools.ebnf.HookCombinator;
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21 | import de.ugoe.cs.swe.bnftools.ebnf.Import;
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22 | import de.ugoe.cs.swe.bnftools.ebnf.ImportSection;
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23 | import de.ugoe.cs.swe.bnftools.ebnf.MergeEntry;
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24 | import de.ugoe.cs.swe.bnftools.ebnf.MergeRule;
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25 | import de.ugoe.cs.swe.bnftools.ebnf.OptionalSequence;
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26 | import de.ugoe.cs.swe.bnftools.ebnf.RepeatedSequence;
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27 | import de.ugoe.cs.swe.bnftools.ebnf.Rule;
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28 | import de.ugoe.cs.swe.bnftools.ebnf.RuleCombinator;
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29 | import de.ugoe.cs.swe.bnftools.ebnf.RuleReference;
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30 | import de.ugoe.cs.swe.bnftools.ebnf.SectionHeading;
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31 | import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition;
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32 | import de.ugoe.cs.swe.bnftools.ebnf.StringRule;
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33 | import de.ugoe.cs.swe.bnftools.ebnf.Term;
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34 | import de.ugoe.cs.swe.bnftools.visitor.EbnfVisitor;
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35 |
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36 | public class EbnfFormatterVisitor extends EbnfVisitor {
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37 | protected StringBuffer buf;
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38 | protected FormatterConfig config;
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39 | protected int bufferPositionFormattedTextNoWhitespaces = 0;
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40 | protected int bufferPositionOriginalText = 0;
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41 | protected int allCommentsPosition = 0;
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42 | protected ArrayList<LeafNode> allComments = new ArrayList<LeafNode>();
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43 |
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44 | protected boolean lastWasSectionHeading=false;
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45 | protected CompositeNode parserEtsiBnfNode;
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46 | protected String originalText;
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47 | protected int bufferPositionFormattedText;
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48 | protected String formattedText;
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49 | protected String formattedTextNoWhitespaces;
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50 | protected String originalTextNoWhitespaces;
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51 | protected int newLineOffsetCounter = 0;
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52 | protected int rightHandSideRuleOffset = 0;
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53 | protected Stack<Integer> ruleSpacingStack = new Stack<Integer>();
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54 | protected Double averageSingleDefinitionLength;
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55 |
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56 | public EbnfFormatterVisitor(EObject rootNode, FormatterConfig config) {
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57 | super(rootNode);
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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 EbnfFormatterVisitor(FormatterConfig config) {
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63 | this.config = config;
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64 | buf = new StringBuffer();
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65 | }
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66 |
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67 | public StringBuffer getBuf() {
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68 | return buf;
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69 | }
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70 |
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71 | private boolean isCommentNode(LeafNode node) {
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72 | if ((node.getText().trim().startsWith("//") || node.getText().trim().startsWith("/*")) && (node.isHidden()))
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73 | return true;
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74 | return false;
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75 | }
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76 |
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77 | private void collectAllComments(CompositeNode node) {
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78 | for (int i=0; i < node.getChildren().size(); i++) {
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79 | AbstractNode currentNode = node.getChildren().get(i);
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80 | if (currentNode instanceof LeafNode) {
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81 | LeafNode leafNode = (LeafNode) currentNode;
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82 | if (isCommentNode(leafNode)) {
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83 | allComments.add(leafNode);
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84 | }
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85 | }
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86 |
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87 | if (currentNode instanceof CompositeNode) {
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88 | collectAllComments((CompositeNode) currentNode);
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89 | }
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90 | }
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91 | }
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92 |
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93 | private boolean isSingleLineComment(String str) {
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94 | if (str.startsWith("//"))
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95 | return true;
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96 | return false;
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97 | }
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98 |
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99 | private boolean isMultiLineComment(String str) {
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100 | if (str.startsWith("/*"))
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101 | return true;
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102 | return false;
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103 | }
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104 |
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105 | private boolean isWhitespace(char ch) {
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106 | if ((ch==' ') || (ch == '\t') || (ch == '\n') || (ch == '\r'))
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107 | return true;
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108 | return false;
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109 | }
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110 |
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111 | private void skipWhitespacesOriginalText() {
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112 | while (bufferPositionOriginalText < originalText.length() && isWhitespace(originalText.charAt(bufferPositionOriginalText))) {
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113 | bufferPositionOriginalText++;
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114 | }
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115 | }
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116 |
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117 | private void skipWhitespacesFormattedText(StringBuffer result) {
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118 | while (bufferPositionFormattedText < formattedText.length() && isWhitespace(formattedText.charAt(bufferPositionFormattedText))) {
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119 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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120 | bufferPositionFormattedText++;
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121 | }
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122 | }
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123 |
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124 | private boolean isSingleLineCommentNext(String str, int position) {
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125 | if ((str.charAt(position) == '/') && (str.charAt(position) == '/'))
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126 | return true;
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127 | return false;
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128 | }
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129 |
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130 | private boolean isMultiLineCommentNext(String str, int position) {
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131 | if ((str.charAt(position) == '/') && (str.charAt(position) == '*'))
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132 | return true;
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133 | return false;
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134 | }
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135 |
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136 | private boolean isCommentNext(String str, int position) {
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137 | if (isSingleLineCommentNext(str, position) || isMultiLineCommentNext(str, position))
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138 | return true;
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139 | else
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140 | return false;
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141 | }
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142 |
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143 | private String scanBackWhitespaces(String str, int position) {
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144 | StringBuffer whiteSpaces = new StringBuffer();
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145 | int currentPosition = position;
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146 | while (isWhitespace(str.charAt(currentPosition))) {
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147 | whiteSpaces.append(str.charAt(currentPosition));
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148 | currentPosition--;
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149 | }
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150 | return whiteSpaces.toString();
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151 | }
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152 |
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153 | private String stripEndingNewline(String str) {
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154 | int position = str.length() - 1;
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155 | while ((str.charAt(position) == '\n') || (str.charAt(position) == '\r')) {
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156 | position--;
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157 | }
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158 | return str.substring(0, position + 1);
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159 | }
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160 |
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161 | private int scanBackNewlinesCount(String str, int position) {
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162 | int newLinesCount = 0;
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163 | int currentPosition = position;
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164 | while ((str.charAt(currentPosition) == '\n') || (str.charAt(currentPosition) == '\r')) {
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165 | if (str.charAt(currentPosition) == '\n') {
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166 | if (str.charAt(currentPosition - 1) == '\r') {
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167 | currentPosition -= 2;
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168 | } else {
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169 | currentPosition -= 1;
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170 | }
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171 | newLinesCount++;
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172 | } else if (str.charAt(currentPosition) == '\r') {
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173 | currentPosition -= 1;
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174 | newLinesCount++;
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175 | }
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176 | }
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177 |
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178 | return newLinesCount;
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179 | }
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180 |
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181 | private void weaveComments() {
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182 | bufferPositionOriginalText = 0;
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183 | bufferPositionFormattedTextNoWhitespaces = 0;
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184 | bufferPositionFormattedText = 0;
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185 |
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186 | StringBuffer result = new StringBuffer();
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187 | formattedTextNoWhitespaces = buf.toString().replaceAll("[ \t\n\r]", "");
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188 | formattedText = buf.toString();
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189 |
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190 | while (bufferPositionFormattedTextNoWhitespaces <= formattedTextNoWhitespaces.length()) {
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191 | skipWhitespacesOriginalText();
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192 | skipWhitespacesFormattedText(result);
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193 |
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194 | if (!(bufferPositionOriginalText < originalText.length()))
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195 | break;
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196 |
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197 | char formattedPositionNoWhitespaces;
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198 | if (bufferPositionFormattedTextNoWhitespaces == formattedTextNoWhitespaces.length()) {
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199 | formattedPositionNoWhitespaces = ' ';
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200 | } else {
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201 | formattedPositionNoWhitespaces = formattedTextNoWhitespaces.charAt(bufferPositionFormattedTextNoWhitespaces);
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202 | }
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203 | char originalPosition = originalText.charAt(bufferPositionOriginalText);
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204 |
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205 | if (formattedPositionNoWhitespaces != originalPosition) {
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206 | if (formattedPositionNoWhitespaces == ';') { // formatted text always outputs the optional semicolon, skip it if necessary
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207 | bufferPositionFormattedTextNoWhitespaces++;
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208 | bufferPositionFormattedText++;
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209 | } else if (isCommentNext(originalText, bufferPositionOriginalText)) {
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210 | LeafNode currentComment = allComments.get(allCommentsPosition);
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211 | if (currentComment.getTotalOffset() == bufferPositionOriginalText) {
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212 | if (isMultiLineComment(currentComment.getText())) {
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213 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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214 | if (newLinesCount > 0) {
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215 | if (scanBackNewlinesCount(result.toString(), result.toString().length()-1) == 0) {
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216 | result.append("\n\n");
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217 | }
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218 |
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219 | result.append(currentComment.getText());
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220 | result.append("\n");
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221 | } else {
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222 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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223 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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224 | result.append(" " + stripEndingNewline(currentComment.getText()));
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225 | result.append(lastWhiteSpaces);
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226 | }
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227 | } else if (isSingleLineComment(currentComment.getText())) {
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228 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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229 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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230 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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231 | if (newLinesCount > 0) {
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232 | result.append("\n\n" + stripEndingNewline(currentComment.getText()));
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233 | } else {
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234 | result.append(" " + stripEndingNewline(currentComment.getText()));
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235 | }
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236 | result.append(lastWhiteSpaces);
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237 | }
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238 | bufferPositionOriginalText+=currentComment.getLength();
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239 | allCommentsPosition++;
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240 | }
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241 | } else { // disaster handling: return original unformatted text!
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242 | System.err.println("Disaster Recovery: returning original text!!");
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243 | buf = new StringBuffer();
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244 | buf.append(originalText);
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245 | return;
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246 | }
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247 | } else {
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248 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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249 | bufferPositionOriginalText++;
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250 | bufferPositionFormattedText++;
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251 | bufferPositionFormattedTextNoWhitespaces++;
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252 | }
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253 | }
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254 | buf = result;
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255 | }
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256 |
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257 | private void newLine() {
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258 | buf.append("\n");
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259 | if ((ruleSpacingStack != null) && (!ruleSpacingStack.empty())) {
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260 | newLineOffsetCounter = ruleSpacingStack.peek();
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261 | } else {
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262 | newLineOffsetCounter = 0;
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263 | }
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264 | }
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265 |
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266 | private void text(String str) {
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267 | buf.append(str);
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268 | newLineOffsetCounter += str.length();
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269 | }
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270 |
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271 | private void space() {
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272 | buf.append(" ");
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273 | newLineOffsetCounter++;
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274 | }
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275 |
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276 | private void spaces(int count) {
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277 | for (int i=0; i < count; i++) {
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278 | buf.append(" ");
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279 | }
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280 | }
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281 |
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282 | private boolean lastIsClosingParentheses() {
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283 | char ch = buf.toString().charAt(buf.toString().length()-1);
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284 | if ((ch == ')') || (ch == ']') || (ch == '}'))
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285 | return true;
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286 | return false;
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287 | }
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288 |
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289 | private void wrap() {
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290 | if ((config.isWrapAfterThreshold()) && (newLineOffsetCounter > config.getWrapThreshold())) {
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291 | char last = buf.toString().charAt(buf.toString().length()-1);
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292 | if (!((last == '(' || last == '[' || last == '{' ))) {
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293 | newLine();
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294 | if (ruleSpacingStack.size() > 1)
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295 | spaces(ruleSpacingStack.peek() + 1);
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296 | else
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297 | spaces(ruleSpacingStack.peek());
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298 | }
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299 | }
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300 | }
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301 |
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302 | // -----------------------------------------------------------------------------
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303 |
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304 | protected void visitBefore(EtsiBnf node) {
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305 | parserEtsiBnfNode = NodeUtil.getNodeAdapter(node).getParserNode();
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306 | collectAllComments(parserEtsiBnfNode);
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307 | originalText = NodeUtil.getNodeAdapter(node).getParserNode().serialize();
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308 | originalTextNoWhitespaces = originalText.replaceAll("[ \t\n\r]", "");
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309 |
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310 | text("grammar " + node.getName());
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311 | if (node.getType() != null)
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312 | text(node.getType());
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313 | text(";");
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314 |
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315 | newLine();
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316 | newLine();
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317 | }
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318 |
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319 | protected void visitAfter(EtsiBnf node) {
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320 | weaveComments();
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321 | }
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322 |
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323 | protected void visitBefore(ImportSection node) {
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324 | }
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325 |
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326 | protected void visitAfter(ImportSection node) {
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327 | newLine();
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328 | }
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329 |
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330 | protected void visitBefore(BnfEntry node) {
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331 | }
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332 |
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333 | protected void visitAfter(BnfEntry node) {
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334 | }
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335 |
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336 | protected void visitBefore(DeltaEntry node) {
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337 | }
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338 |
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339 | protected void visitAfter(DeltaEntry node) {
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340 | }
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341 |
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342 | protected void visitBefore(MergeEntry node) {
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343 | }
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344 |
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345 | protected void visitAfter(MergeEntry node) {
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346 | }
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347 |
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348 | protected void visitBefore(Atom node) {
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349 | }
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350 |
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351 | protected void visitAfter(Atom node) {
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352 | }
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353 |
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354 | protected void visitBefore(Term node) {
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355 | }
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356 |
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357 | protected void visitAfter(Term node) {
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358 | if (!isLastElement())
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359 | space();
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360 | }
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361 |
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362 | protected void visitBefore(DefinitionList node) {
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363 | averageSingleDefinitionLength = null;
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364 | int totalLength = 0;
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365 | for (int i=0; i < node.eContents().size(); i++) {
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366 | CompositeNode parseNode = NodeUtil.getNodeAdapter(node.eContents().get(i)).getParserNode();
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367 | totalLength += parseNode.serialize().trim().length();
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368 | }
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369 | averageSingleDefinitionLength = (double) totalLength / (double) node.eContents().size();
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370 | }
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371 |
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372 | protected void visitAfter(DefinitionList node) {
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373 | }
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374 |
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375 | protected void visitBefore(ExtRule node) {
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376 | }
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377 |
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378 | protected void visitAfter(ExtRule node) {
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379 | }
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380 |
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381 | protected void visitBefore(GlobalCombinator node) {
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382 | }
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383 |
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384 | protected void visitAfter(GlobalCombinator node) {
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385 | }
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386 |
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387 | protected void visitBefore(HookCombinator node) {
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388 | }
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389 |
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390 | protected void visitAfter(HookCombinator node) {
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391 | }
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392 |
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393 | protected void visitBefore(Import node) {
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394 | text("import \"" + node.getImportURI() + "\"");
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395 | if (node.getGrammarType() != null) {
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396 | text("/" + node.getGrammarType());
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397 | }
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398 | if (node.getLabel() != null) {
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399 | space();
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400 | text("label: " + node.getLabel());
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401 | }
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402 | text(";");
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403 | newLine();
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404 | }
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405 |
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406 | protected void visitAfter(Import node) {
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407 | }
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408 |
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409 | protected void visitBefore(MergeRule node) {
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410 | }
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411 |
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412 | protected void visitAfter(MergeRule node) {
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413 | }
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414 |
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415 | protected void visitBefore(GroupedSequence node) {
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416 | wrap();
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417 | text("(");
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418 | ruleSpacingStack.push(newLineOffsetCounter-1);
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419 | }
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420 |
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421 | protected void visitAfter(GroupedSequence node) {
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422 | // if ((config.isAlignParentheses() && (node.eContents().get(0).eContents().size() >= config.getAlignParenthesesElementCountThreshold())) || (lastIsClosingParentheses())) {
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423 | if (config.isAlignParentheses() && (node.eContents().get(0).eContents().size() >= config.getAlignParenthesesElementCountThreshold())) {
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424 | newLine();
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425 | spaces(ruleSpacingStack.peek());
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426 | }
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427 |
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428 | text(")");
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429 | ruleSpacingStack.pop();
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430 | }
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431 |
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432 | protected void visitBefore(OptionalSequence node) {
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433 | wrap();
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434 | text("[");
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435 | ruleSpacingStack.push(newLineOffsetCounter-1);
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436 | }
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437 |
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438 | protected void visitAfter(OptionalSequence node) {
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439 | // if ((config.isAlignParentheses() && (node.eContents().get(0).eContents().size() >= config.getAlignParenthesesElementCountThreshold())) || (lastIsClosingParentheses())) {
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440 | if (config.isAlignParentheses() && (node.eContents().get(0).eContents().size() >= config.getAlignParenthesesElementCountThreshold())) {
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441 | newLine();
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442 | spaces(ruleSpacingStack.peek());
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443 | }
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444 |
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445 | text("]");
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446 | ruleSpacingStack.pop();
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447 | }
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448 |
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449 | protected void visitBefore(RepeatedSequence node) {
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450 | wrap();
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451 | text("{");
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452 | ruleSpacingStack.push(newLineOffsetCounter-1);
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453 | }
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454 |
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455 | protected void visitAfter(RepeatedSequence node) {
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456 | // if ((config.isAlignParentheses() && (node.eContents().get(0).eContents().size() >= config.getAlignParenthesesElementCountThreshold())) || (lastIsClosingParentheses())) {
|
---|
457 | if (config.isAlignParentheses() && (node.eContents().get(0).eContents().size() >= config.getAlignParenthesesElementCountThreshold())) {
|
---|
458 | newLine();
|
---|
459 | spaces(ruleSpacingStack.peek());
|
---|
460 | }
|
---|
461 |
|
---|
462 | text("}");
|
---|
463 | if (node.isMorethanonce())
|
---|
464 | text("+");
|
---|
465 | ruleSpacingStack.pop();
|
---|
466 | }
|
---|
467 |
|
---|
468 | protected void visitBefore(Rule node) {
|
---|
469 | if (lastWasSectionHeading)
|
---|
470 | newLine();
|
---|
471 |
|
---|
472 | lastWasSectionHeading=false;
|
---|
473 |
|
---|
474 | newLineOffsetCounter = 0;
|
---|
475 |
|
---|
476 | if (node.getRulenumber() > 0)
|
---|
477 | text(node.getRulenumber() + ". ");
|
---|
478 |
|
---|
479 | text(node.getName() + " ::= ");
|
---|
480 |
|
---|
481 | rightHandSideRuleOffset = newLineOffsetCounter;
|
---|
482 | ruleSpacingStack.push(newLineOffsetCounter);
|
---|
483 | }
|
---|
484 |
|
---|
485 | protected void visitAfter(Rule node) {
|
---|
486 | text(";");
|
---|
487 | newLine();
|
---|
488 | ruleSpacingStack.pop();
|
---|
489 | }
|
---|
490 |
|
---|
491 | protected void visitBefore(RuleCombinator node) {
|
---|
492 | }
|
---|
493 |
|
---|
494 | protected void visitAfter(RuleCombinator node) {
|
---|
495 | }
|
---|
496 |
|
---|
497 | protected void visitBefore(RuleReference node) {
|
---|
498 | wrap();
|
---|
499 | text(node.getRuleref().getName());
|
---|
500 | }
|
---|
501 |
|
---|
502 | protected void visitAfter(RuleReference node) {
|
---|
503 | }
|
---|
504 |
|
---|
505 | protected void visitBefore(SectionHeading node) {
|
---|
506 | if (!lastWasSectionHeading && !buf.substring(buf.length()-2).equals("\n\n"))
|
---|
507 | newLine();
|
---|
508 |
|
---|
509 | lastWasSectionHeading=true;
|
---|
510 |
|
---|
511 | text(node.getSectionHeader());
|
---|
512 | }
|
---|
513 |
|
---|
514 | protected void visitAfter(SectionHeading node) {
|
---|
515 | }
|
---|
516 |
|
---|
517 | protected void visitBefore(SingleDefinition node) {
|
---|
518 | }
|
---|
519 |
|
---|
520 | protected void visitAfter(SingleDefinition node) {
|
---|
521 | boolean preventAlternativeBreakShortAlternatives = config.isPreventNewLineAfterAlternativeOnShortAlternatives() && (averageSingleDefinitionLength <= config.getShortAlternativeThreshold());
|
---|
522 | if (!isLastElement()) {
|
---|
523 | text(" | ");
|
---|
524 | if (config.isNewLineAfterAlternative()) {
|
---|
525 | if (config.isPreventNewLineAfterAlternativeOnLessThanThreeElements()) {
|
---|
526 | DefinitionList definitionList = (DefinitionList) node.eContainer();
|
---|
527 | if ((definitionList.eContents().size() > 2) && (!preventAlternativeBreakShortAlternatives)) {
|
---|
528 | newLine();
|
---|
529 | if (ruleSpacingStack.size() > 1)
|
---|
530 | spaces(ruleSpacingStack.peek() + 1);
|
---|
531 | else
|
---|
532 | spaces(ruleSpacingStack.peek());
|
---|
533 | }
|
---|
534 | } else {
|
---|
535 | if (!preventAlternativeBreakShortAlternatives) {
|
---|
536 | newLine();
|
---|
537 | if (ruleSpacingStack.size() > 1)
|
---|
538 | spaces(ruleSpacingStack.peek() + 1);
|
---|
539 | else
|
---|
540 | spaces(ruleSpacingStack.peek());
|
---|
541 | }
|
---|
542 | }
|
---|
543 | }
|
---|
544 | }
|
---|
545 | }
|
---|
546 |
|
---|
547 | protected void visitBefore(StringRule node) {
|
---|
548 | wrap();
|
---|
549 | if (node.getLiteral() != null)
|
---|
550 | text("\"" + node.getLiteral() + "\"");
|
---|
551 | else if (node.getColon() != null)
|
---|
552 | text("\"\"\"");
|
---|
553 | }
|
---|
554 |
|
---|
555 | protected void visitAfter(StringRule node) {
|
---|
556 | }
|
---|
557 |
|
---|
558 | }
|
---|