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.NodeAdapter;
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11 | import org.eclipse.xtext.parsetree.NodeUtil;
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12 |
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13 | import de.ugoe.cs.swe.bnftools.ebnf.Atom;
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14 | import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry;
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15 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
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16 | import de.ugoe.cs.swe.bnftools.ebnf.DeltaEntry;
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17 | import de.ugoe.cs.swe.bnftools.ebnf.EtsiBnf;
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18 | import de.ugoe.cs.swe.bnftools.ebnf.ExtRule;
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19 | import de.ugoe.cs.swe.bnftools.ebnf.GlobalCombinator;
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20 | import de.ugoe.cs.swe.bnftools.ebnf.GroupedSequence;
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21 | import de.ugoe.cs.swe.bnftools.ebnf.HookCombinator;
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22 | import de.ugoe.cs.swe.bnftools.ebnf.Import;
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23 | import de.ugoe.cs.swe.bnftools.ebnf.ImportSection;
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24 | import de.ugoe.cs.swe.bnftools.ebnf.MergeEntry;
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25 | import de.ugoe.cs.swe.bnftools.ebnf.MergeRule;
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26 | import de.ugoe.cs.swe.bnftools.ebnf.OptionalSequence;
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27 | import de.ugoe.cs.swe.bnftools.ebnf.RepeatedSequence;
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28 | import de.ugoe.cs.swe.bnftools.ebnf.Rule;
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29 | import de.ugoe.cs.swe.bnftools.ebnf.RuleCombinator;
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30 | import de.ugoe.cs.swe.bnftools.ebnf.RuleReference;
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31 | import de.ugoe.cs.swe.bnftools.ebnf.SectionHeading;
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32 | import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition;
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33 | import de.ugoe.cs.swe.bnftools.ebnf.StringRule;
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34 | import de.ugoe.cs.swe.bnftools.ebnf.Term;
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35 | import de.ugoe.cs.swe.bnftools.visitor.EbnfVisitor;
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36 |
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37 | public class EbnfFormatterVisitor extends EbnfVisitor {
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38 | private StringBuffer buf;
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39 | private FormatterConfig config;
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40 | private int bufferPositionFormattedTextNoWhitespaces = 0;
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41 | private int bufferPositionOriginalText = 0;
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42 | private int allCommentsPosition = 0;
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43 | private ArrayList<LeafNode> allComments = new ArrayList<LeafNode>();
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44 |
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45 | private boolean lastWasSectionHeading=false;
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46 | private CompositeNode parserEtsiBnfNode;
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47 | private String originalText;
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48 | private int bufferPositionFormattedText;
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49 | private String formattedText;
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50 | private String formattedTextNoWhitespaces;
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51 | private String originalTextNoWhitespaces;
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52 | private int newLineOffsetCounter = 0;
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53 | private int rightHandSideRuleOffset = 0;
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54 | private Stack<Integer> ruleSpacingStack = new Stack<Integer>();
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55 | private Double averageSingleDefinitionLength;
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56 |
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57 | public EbnfFormatterVisitor(EObject rootNode, FormatterConfig config) {
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58 | super(rootNode);
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59 | this.config = config;
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60 | buf = new StringBuffer();
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61 | }
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62 |
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63 | public EbnfFormatterVisitor(FormatterConfig config) {
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64 | this.config = config;
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65 | buf = new StringBuffer();
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66 | }
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67 |
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68 | public StringBuffer getBuf() {
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69 | return buf;
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70 | }
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71 |
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72 | private boolean isCommentNode(LeafNode node) {
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73 | if ((node.getText().trim().startsWith("//") || node.getText().trim().startsWith("/*")) && (node.isHidden()))
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74 | return true;
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75 | return false;
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76 | }
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77 |
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78 | private void collectAllComments(CompositeNode node) {
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79 | for (int i=0; i < node.getChildren().size(); i++) {
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80 | AbstractNode currentNode = node.getChildren().get(i);
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81 | if (currentNode instanceof LeafNode) {
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82 | LeafNode leafNode = (LeafNode) currentNode;
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83 | if (isCommentNode(leafNode)) {
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84 | allComments.add(leafNode);
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85 | }
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86 | }
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87 |
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88 | if (currentNode instanceof CompositeNode) {
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89 | collectAllComments((CompositeNode) currentNode);
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90 | }
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91 | }
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92 | }
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93 |
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94 | private boolean isSingleLineComment(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 isMultiLineComment(String str) {
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101 | if (str.startsWith("/*"))
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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 boolean isWhitespace(char ch) {
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107 | if ((ch==' ') || (ch == '\t') || (ch == '\n') || (ch == '\r'))
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108 | return true;
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109 | return false;
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110 | }
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111 |
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112 | private void skipWhitespacesOriginalText() {
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113 | while (bufferPositionOriginalText < originalText.length() && isWhitespace(originalText.charAt(bufferPositionOriginalText))) {
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114 | bufferPositionOriginalText++;
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115 | }
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116 | }
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117 |
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118 | private void skipWhitespacesFormattedText(StringBuffer result) {
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119 | while (bufferPositionFormattedText < formattedText.length() && isWhitespace(formattedText.charAt(bufferPositionFormattedText))) {
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120 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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121 | bufferPositionFormattedText++;
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122 | }
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123 | }
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124 |
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125 | private boolean isSingleLineCommentNext(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 isMultiLineCommentNext(String str, int position) {
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132 | if ((str.charAt(position) == '/') && (str.charAt(position) == '*'))
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133 | return true;
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134 | return false;
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135 | }
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136 |
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137 | private boolean isCommentNext(String str, int position) {
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138 | if (isSingleLineCommentNext(str, position) || isMultiLineCommentNext(str, position))
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139 | return true;
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140 | else
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141 | return false;
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142 | }
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143 |
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144 | private String scanBackWhitespaces(String str, int position) {
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145 | StringBuffer whiteSpaces = new StringBuffer();
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146 | int currentPosition = position;
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147 | while (isWhitespace(str.charAt(currentPosition))) {
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148 | whiteSpaces.append(str.charAt(currentPosition));
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149 | currentPosition--;
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150 | }
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151 | return whiteSpaces.toString();
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152 | }
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153 |
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154 | private String stripEndingNewline(String str) {
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155 | int position = str.length() - 1;
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156 | while ((str.charAt(position) == '\n') || (str.charAt(position) == '\r')) {
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157 | position--;
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158 | }
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159 | return str.substring(0, position + 1);
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160 | }
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161 |
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162 | private int scanBackNewlinesCount(String str, int position) {
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163 | int newLinesCount = 0;
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164 | int currentPosition = position;
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165 | while ((str.charAt(currentPosition) == '\n') || (str.charAt(currentPosition) == '\r')) {
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166 | if (str.charAt(currentPosition) == '\n') {
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167 | if (str.charAt(currentPosition - 1) == '\r') {
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168 | currentPosition -= 2;
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169 | } else {
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170 | currentPosition -= 1;
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171 | }
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172 | newLinesCount++;
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173 | } else if (str.charAt(currentPosition) == '\r') {
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174 | currentPosition -= 1;
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175 | newLinesCount++;
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176 | }
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177 | }
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178 |
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179 | return newLinesCount;
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180 | }
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181 |
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182 | private void weaveComments() {
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183 | // if (true) {
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184 | // StringBuffer result = new StringBuffer();
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185 | // result.append(buf.toString());
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186 | // buf = result;
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187 | // return;
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188 | // }
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189 |
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190 | bufferPositionOriginalText = 0;
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191 | bufferPositionFormattedTextNoWhitespaces = 0;
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192 | bufferPositionFormattedText = 0;
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193 |
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194 | StringBuffer result = new StringBuffer();
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195 | formattedTextNoWhitespaces = buf.toString().replaceAll("[ \t\n\r]", "");
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196 | formattedText = buf.toString();
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197 |
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198 | while (bufferPositionFormattedTextNoWhitespaces <= formattedTextNoWhitespaces.length()) {
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199 | skipWhitespacesOriginalText();
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200 | skipWhitespacesFormattedText(result);
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201 |
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202 | if (!(bufferPositionOriginalText < originalText.length()))
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203 | break;
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204 |
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205 | char formattedPositionNoWhitespaces;
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206 | if (bufferPositionFormattedTextNoWhitespaces == formattedTextNoWhitespaces.length()) {
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207 | formattedPositionNoWhitespaces = ' ';
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208 | } else {
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209 | formattedPositionNoWhitespaces = formattedTextNoWhitespaces.charAt(bufferPositionFormattedTextNoWhitespaces);
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210 | }
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211 | char originalPosition = originalText.charAt(bufferPositionOriginalText);
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212 |
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213 | if (formattedPositionNoWhitespaces != originalPosition) {
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214 | if (formattedPositionNoWhitespaces == ';') { // formatted text always outputs the optional semicolon, skip it if necessary
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215 | bufferPositionFormattedTextNoWhitespaces++;
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216 | bufferPositionFormattedText++;
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217 | } else if (isCommentNext(originalText, bufferPositionOriginalText)) {
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218 | LeafNode currentComment = allComments.get(allCommentsPosition);
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219 | if (currentComment.getTotalOffset() == bufferPositionOriginalText) {
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220 | if (isMultiLineComment(currentComment.getText())) {
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221 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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222 | if (newLinesCount > 0) {
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223 | if (scanBackNewlinesCount(result.toString(), result.toString().length()-1) == 0) {
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224 | result.append("\n\n");
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225 | }
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226 |
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227 | result.append(currentComment.getText());
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228 | result.append("\n");
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229 | } else {
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230 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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231 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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232 | result.append(" " + stripEndingNewline(currentComment.getText()));
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233 | result.append(lastWhiteSpaces);
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234 | }
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235 | } else if (isSingleLineComment(currentComment.getText())) {
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236 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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237 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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238 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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239 | if (newLinesCount > 0) {
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240 | result.append("\n\n" + stripEndingNewline(currentComment.getText()));
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241 | } else {
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242 | result.append(" " + stripEndingNewline(currentComment.getText()));
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243 | }
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244 | result.append(lastWhiteSpaces);
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245 | }
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246 | bufferPositionOriginalText+=currentComment.getLength();
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247 | allCommentsPosition++;
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248 | }
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249 | } else { // disaster handling: return original unformatted text!
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250 | buf = new StringBuffer();
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251 | buf.append(originalText);
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252 | return;
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253 | }
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254 | } else {
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255 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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256 | bufferPositionOriginalText++;
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257 | bufferPositionFormattedText++;
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258 | bufferPositionFormattedTextNoWhitespaces++;
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259 | }
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260 | }
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261 | buf = result;
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262 | }
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263 |
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264 | private void newLine() {
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265 | buf.append("\n");
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266 | if ((ruleSpacingStack != null) && (!ruleSpacingStack.empty())) {
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267 | newLineOffsetCounter = ruleSpacingStack.peek();
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268 | } else {
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269 | newLineOffsetCounter = 0;
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270 | }
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271 | }
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272 |
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273 | private void text(String str) {
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274 | buf.append(str);
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275 | newLineOffsetCounter += str.length();
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276 | }
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277 |
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278 | private void space() {
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279 | buf.append(" ");
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280 | newLineOffsetCounter++;
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281 | }
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282 |
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283 | private void spaces(int count) {
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284 | for (int i=0; i < count; i++) {
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285 | buf.append(" ");
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286 | }
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287 | }
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288 |
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289 | // -----------------------------------------------------------------------------
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290 |
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291 | protected void visitBefore(EtsiBnf node) {
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292 | parserEtsiBnfNode = NodeUtil.getNodeAdapter(node).getParserNode();
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293 | collectAllComments(parserEtsiBnfNode);
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294 | originalText = NodeUtil.getNodeAdapter(node).getParserNode().serialize();
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295 | originalTextNoWhitespaces = originalText.replaceAll("[ \t\n\r]", "");
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296 |
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297 | text("grammar " + node.getName());
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298 | if (node.getType() != null)
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299 | text(node.getType());
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300 | text(";");
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301 |
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302 | newLine();
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303 | newLine();
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304 | }
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305 |
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306 | protected void visitAfter(EtsiBnf node) {
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307 | weaveComments();
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308 | }
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309 |
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310 | protected void visitBefore(ImportSection node) {
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311 | }
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312 |
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313 | protected void visitAfter(ImportSection node) {
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314 | newLine();
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315 | }
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316 |
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317 | protected void visitBefore(BnfEntry node) {
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318 | }
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319 |
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320 | protected void visitAfter(BnfEntry node) {
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321 | }
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322 |
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323 | protected void visitBefore(DeltaEntry node) {
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324 | }
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325 |
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326 | protected void visitAfter(DeltaEntry node) {
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327 | }
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328 |
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329 | protected void visitBefore(MergeEntry node) {
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330 | }
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331 |
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332 | protected void visitAfter(MergeEntry node) {
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333 | }
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334 |
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335 | protected void visitBefore(Atom node) {
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336 | }
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337 |
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338 | protected void visitAfter(Atom node) {
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339 | }
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340 |
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341 | protected void visitBefore(Term node) {
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342 | }
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343 |
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344 | protected void visitAfter(Term node) {
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345 | if (!isLastElement())
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346 | space();
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347 | }
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348 |
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349 | protected void visitBefore(DefinitionList node) {
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350 | averageSingleDefinitionLength = null;
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351 | int totalLength = 0;
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352 | for (int i=0; i < node.eContents().size(); i++) {
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353 | CompositeNode parseNode = NodeUtil.getNodeAdapter(node.eContents().get(i)).getParserNode();
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354 | totalLength += parseNode.serialize().trim().length();
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355 | }
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356 | averageSingleDefinitionLength = (double) totalLength / (double) node.eContents().size();
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357 | }
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358 |
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359 | protected void visitAfter(DefinitionList node) {
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360 | }
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361 |
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362 | protected void visitBefore(ExtRule node) {
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363 | }
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364 |
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365 | protected void visitAfter(ExtRule node) {
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366 | }
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367 |
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368 | protected void visitBefore(GlobalCombinator node) {
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369 | }
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370 |
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371 | protected void visitAfter(GlobalCombinator node) {
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372 | }
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373 |
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374 | protected void visitBefore(GroupedSequence node) {
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375 | text("(");
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376 | ruleSpacingStack.push(newLineOffsetCounter);
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377 | }
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378 |
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379 | protected void visitAfter(GroupedSequence node) {
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380 | text(")");
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381 | ruleSpacingStack.pop();
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382 | }
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383 |
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384 | protected void visitBefore(HookCombinator node) {
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385 | }
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386 |
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387 | protected void visitAfter(HookCombinator node) {
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388 | }
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389 |
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390 | protected void visitBefore(Import node) {
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391 | text("import \"" + node.getImportURI() + "\";");
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392 | newLine();
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393 | }
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394 |
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395 | protected void visitAfter(Import node) {
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396 | }
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397 |
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398 | protected void visitBefore(MergeRule node) {
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399 | }
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400 |
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401 | protected void visitAfter(MergeRule node) {
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402 | }
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403 |
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404 | protected void visitBefore(OptionalSequence node) {
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405 | text("[");
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406 | ruleSpacingStack.push(newLineOffsetCounter);
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407 | }
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408 |
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409 | protected void visitAfter(OptionalSequence node) {
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410 | text("]");
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411 | ruleSpacingStack.pop();
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412 | }
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413 |
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414 | protected void visitBefore(RepeatedSequence node) {
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415 | text("{");
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416 | ruleSpacingStack.push(newLineOffsetCounter);
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417 | }
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418 |
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419 | protected void visitAfter(RepeatedSequence node) {
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420 | text("}");
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421 | if (node.isMorethanonce())
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422 | text("+");
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423 | ruleSpacingStack.pop();
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424 | }
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425 |
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426 | protected void visitBefore(Rule node) {
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427 | if (lastWasSectionHeading)
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428 | newLine();
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429 |
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430 | lastWasSectionHeading=false;
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431 |
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432 | newLineOffsetCounter = 0;
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433 |
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434 | if (node.getRulenumber() > 0)
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435 | text(node.getRulenumber() + ". ");
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436 |
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437 | text(node.getName() + " ::= ");
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438 |
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439 | rightHandSideRuleOffset = newLineOffsetCounter;
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440 | ruleSpacingStack.push(newLineOffsetCounter);
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441 | }
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442 |
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443 | protected void visitAfter(Rule node) {
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444 | text(";");
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445 | newLine();
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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(RuleCombinator node) {
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450 | }
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451 |
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452 | protected void visitAfter(RuleCombinator node) {
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453 | }
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454 |
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455 | protected void visitBefore(RuleReference node) {
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456 | text(node.getRuleref().getName());
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457 | }
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458 |
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459 | protected void visitAfter(RuleReference node) {
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460 | }
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461 |
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462 | protected void visitBefore(SectionHeading node) {
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463 | if (!lastWasSectionHeading && !buf.substring(buf.length()-2).equals("\n\n"))
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464 | newLine();
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465 |
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466 | lastWasSectionHeading=true;
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467 |
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468 | text(node.getSectionHeader());
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469 | }
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470 |
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471 | protected void visitAfter(SectionHeading node) {
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472 | }
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473 |
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474 | protected void visitBefore(SingleDefinition node) {
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475 | }
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476 |
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477 | protected void visitAfter(SingleDefinition node) {
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478 | boolean preventAlternativeBreakShortAlternatives = config.isPreventNewLineAfterAlternativeOnShortAlternatives() && (averageSingleDefinitionLength <= config.getShortAlternativeThreshold());
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479 | if (!isLastElement()) {
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480 | text(" | ");
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481 | if (config.isNewLineAfterAlternative()) {
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482 | if (config.isPreventNewLineAfterAlternativeOnLessThanThreeElements()) {
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483 | DefinitionList definitionList = (DefinitionList) node.eContainer();
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484 |
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485 | if ((definitionList.eContents().size() > 2) && (!preventAlternativeBreakShortAlternatives)) {
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486 | newLine();
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487 | spaces(ruleSpacingStack.peek());
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488 | }
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489 | } else {
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490 | if (!preventAlternativeBreakShortAlternatives) {
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491 | newLine();
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492 | spaces(ruleSpacingStack.peek());
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493 | }
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494 | }
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495 | }
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496 | }
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497 | }
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498 |
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499 | protected void visitBefore(StringRule node) {
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500 | if (node.getLiteral() != null)
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501 | text("\"" + node.getLiteral() + "\"");
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502 | else if (node.getColon() != null)
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503 | text("\"\"\"");
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504 | }
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505 |
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506 | protected void visitAfter(StringRule node) {
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507 | }
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508 |
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509 | }
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