[9] | 1 | package de.ugoe.cs.swe.bnftools.ui.formatter;
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| 2 |
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[21] | 3 | import java.util.ArrayList;
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| 4 |
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[9] | 5 | import org.eclipse.emf.ecore.EObject;
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[21] | 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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[9] | 10 |
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| 11 | import de.ugoe.cs.swe.bnftools.ebnf.Atom;
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[13] | 12 | import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry;
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[9] | 13 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
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[13] | 14 | import de.ugoe.cs.swe.bnftools.ebnf.DeltaEntry;
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[9] | 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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[12] | 20 | import de.ugoe.cs.swe.bnftools.ebnf.Import;
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[13] | 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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[9] | 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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[25] | 38 | private int bufferPositionFormattedTextNoWhitespaces = 0;
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[21] | 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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[17] | 43 | private boolean lastWasSectionHeading=false;
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[21] | 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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[25] | 48 | private String formattedTextNoWhitespaces;
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[23] | 49 | private String originalTextNoWhitespaces;
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[17] | 50 |
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[9] | 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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[21] | 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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[25] | 107 | while (bufferPositionOriginalText < originalText.length() && isWhitespace(originalText.charAt(bufferPositionOriginalText))) {
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[21] | 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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[25] | 113 | while (bufferPositionFormattedText < formattedText.length() && isWhitespace(formattedText.charAt(bufferPositionFormattedText))) {
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[21] | 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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[22] | 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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[24] | 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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[21] | 176 | private void weaveComments() {
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[25] | 177 | // if (true) {
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| 178 | // StringBuffer result = new StringBuffer();
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| 179 | // result.append(buf.toString());
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| 180 | // buf = result;
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| 181 | // return;
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| 182 | // }
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| 183 |
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[21] | 184 | bufferPositionOriginalText = 0;
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[25] | 185 | bufferPositionFormattedTextNoWhitespaces = 0;
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[21] | 186 | bufferPositionFormattedText = 0;
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| 187 |
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| 188 | StringBuffer result = new StringBuffer();
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[25] | 189 | formattedTextNoWhitespaces = buf.toString().replaceAll("[ \t\n\r]", "");
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[21] | 190 | formattedText = buf.toString();
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| 191 |
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[26] | 192 | while (bufferPositionFormattedTextNoWhitespaces <= formattedTextNoWhitespaces.length()) {
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[21] | 193 | skipWhitespacesOriginalText();
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| 194 | skipWhitespacesFormattedText(result);
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[25] | 195 |
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| 196 | if (!(bufferPositionOriginalText < originalText.length()))
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| 197 | break;
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| 198 |
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[26] | 199 | char formattedPositionNoWhitespaces;
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| 200 | if (bufferPositionFormattedTextNoWhitespaces == formattedTextNoWhitespaces.length()) {
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| 201 | formattedPositionNoWhitespaces = ' ';
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| 202 | } else {
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| 203 | formattedPositionNoWhitespaces = formattedTextNoWhitespaces.charAt(bufferPositionFormattedTextNoWhitespaces);
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| 204 | }
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[25] | 205 | char originalPosition = originalText.charAt(bufferPositionOriginalText);
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[21] | 206 |
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[25] | 207 | if (formattedPositionNoWhitespaces != originalPosition) {
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| 208 | if (formattedPositionNoWhitespaces == ';') { // formatted text always outputs the optional semicolon, skip it if necessary
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| 209 | bufferPositionFormattedTextNoWhitespaces++;
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| 210 | bufferPositionFormattedText++;
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| 211 | } else if (isCommentNext(originalText, bufferPositionOriginalText)) {
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[21] | 212 | LeafNode currentComment = allComments.get(allCommentsPosition);
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| 213 | if (currentComment.getTotalOffset() == bufferPositionOriginalText) {
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| 214 | if (isMultiLineComment(currentComment.getText())) {
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[24] | 215 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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| 216 | if (newLinesCount > 0) {
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[25] | 217 | if (scanBackNewlinesCount(result.toString(), result.toString().length()-1) == 0) {
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| 218 | result.append("\n\n");
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| 219 | }
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| 220 |
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[24] | 221 | result.append(currentComment.getText());
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| 222 | result.append("\n");
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| 223 | } else {
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| 224 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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| 225 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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| 226 | result.append(" " + stripEndingNewline(currentComment.getText()));
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| 227 | result.append(lastWhiteSpaces);
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| 228 | }
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[23] | 229 | } else if (isSingleLineComment(currentComment.getText())) {
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[24] | 230 | int newLinesCount = scanBackNewlinesCount(originalText, bufferPositionOriginalText-1);
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[22] | 231 | String lastWhiteSpaces = scanBackWhitespaces(result.toString(), result.toString().length()-1);
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| 232 | result.delete(result.toString().length() - lastWhiteSpaces.length(), result.toString().length());
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[24] | 233 | if (newLinesCount > 0) {
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| 234 | result.append("\n\n" + stripEndingNewline(currentComment.getText()));
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| 235 | } else {
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| 236 | result.append(" " + stripEndingNewline(currentComment.getText()));
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| 237 | }
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[22] | 238 | result.append(lastWhiteSpaces);
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| 239 | }
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[21] | 240 | bufferPositionOriginalText+=currentComment.getLength();
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| 241 | allCommentsPosition++;
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| 242 | }
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[25] | 243 | } else { // disaster handling: return original unformatted text!
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| 244 | buf = new StringBuffer();
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| 245 | buf.append(originalText);
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| 246 | return;
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[21] | 247 | }
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| 248 | } else {
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| 249 | result.append(formattedText.substring(bufferPositionFormattedText, bufferPositionFormattedText+1));
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| 250 | bufferPositionOriginalText++;
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| 251 | bufferPositionFormattedText++;
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[25] | 252 | bufferPositionFormattedTextNoWhitespaces++;
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[21] | 253 | }
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| 254 | }
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| 255 | buf = result;
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| 256 |
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| 257 | }
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[23] | 258 |
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[21] | 259 |
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[9] | 260 | // -----------------------------------------------------------------------------
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| 261 |
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[11] | 262 | protected void visitBefore(EtsiBnf node) {
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[21] | 263 | parserEtsiBnfNode = NodeUtil.getNodeAdapter(node).getParserNode();
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| 264 | collectAllComments(parserEtsiBnfNode);
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| 265 | originalText = NodeUtil.getNodeAdapter(node).getParserNode().serialize();
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| 266 | originalTextNoWhitespaces = originalText.replaceAll("[ \t\n\r]", "");
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| 267 |
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| 268 | //System.out.println(allComments.toString());
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[9] | 269 | buf.append("grammar " + node.getName());
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| 270 | if (node.getType() != null)
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| 271 | buf.append(node.getType());
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| 272 | buf.append(";");
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[21] | 273 |
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| 274 | buf.append("\n\n");
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[9] | 275 | }
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| 276 |
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[11] | 277 | protected void visitAfter(EtsiBnf node) {
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[21] | 278 | weaveComments();
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[9] | 279 | }
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| 280 |
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[13] | 281 | protected void visitBefore(ImportSection node) {
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| 282 | }
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| 283 |
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| 284 | protected void visitAfter(ImportSection node) {
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| 285 | buf.append("\n");
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| 286 | }
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| 287 |
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| 288 | protected void visitBefore(BnfEntry node) {
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| 289 | }
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| 290 |
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| 291 | protected void visitAfter(BnfEntry node) {
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| 292 | }
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| 293 |
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| 294 | protected void visitBefore(DeltaEntry node) {
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| 295 | }
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| 296 |
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| 297 | protected void visitAfter(DeltaEntry node) {
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| 298 | }
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| 299 |
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| 300 | protected void visitBefore(MergeEntry node) {
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| 301 | }
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| 302 |
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| 303 | protected void visitAfter(MergeEntry node) {
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| 304 | }
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| 305 |
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[11] | 306 | protected void visitBefore(Atom node) {
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[9] | 307 | }
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| 308 |
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[11] | 309 | protected void visitAfter(Atom node) {
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[9] | 310 | }
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| 311 |
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[11] | 312 | protected void visitBefore(Term node) {
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[9] | 313 | }
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| 314 |
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[11] | 315 | protected void visitAfter(Term node) {
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[12] | 316 | if (!isLastElement())
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[11] | 317 | buf.append(" ");
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[9] | 318 | }
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| 319 |
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[11] | 320 | protected void visitBefore(DefinitionList node) {
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[9] | 321 | }
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| 322 |
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[11] | 323 | protected void visitAfter(DefinitionList node) {
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[9] | 324 | }
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| 325 |
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[11] | 326 | protected void visitBefore(ExtRule node) {
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[9] | 327 | }
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| 328 |
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[11] | 329 | protected void visitAfter(ExtRule node) {
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[9] | 330 | }
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| 331 |
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[11] | 332 | protected void visitBefore(GlobalCombinator node) {
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[9] | 333 | }
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| 334 |
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[11] | 335 | protected void visitAfter(GlobalCombinator node) {
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[9] | 336 | }
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| 337 |
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[11] | 338 | protected void visitBefore(GroupedSequence node) {
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| 339 | buf.append("(");
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[9] | 340 | }
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| 341 |
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[11] | 342 | protected void visitAfter(GroupedSequence node) {
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| 343 | buf.append(")");
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[9] | 344 | }
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| 345 |
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[11] | 346 | protected void visitBefore(HookCombinator node) {
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[9] | 347 | }
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| 348 |
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[11] | 349 | protected void visitAfter(HookCombinator node) {
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[9] | 350 | }
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| 351 |
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[11] | 352 | protected void visitBefore(Import node) {
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[21] | 353 | buf.append("import \"" + node.getImportURI() + "\";");
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| 354 | buf.append("\n");
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[9] | 355 | }
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| 356 |
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[11] | 357 | protected void visitAfter(Import node) {
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[9] | 358 | }
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| 359 |
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[11] | 360 | protected void visitBefore(MergeRule node) {
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| 361 | }
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| 362 |
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| 363 | protected void visitAfter(MergeRule node) {
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| 364 | }
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| 365 |
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| 366 | protected void visitBefore(OptionalSequence node) {
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[12] | 367 | buf.append("[");
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[11] | 368 | }
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| 369 |
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| 370 | protected void visitAfter(OptionalSequence node) {
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[12] | 371 | buf.append("]");
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[11] | 372 | }
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| 373 |
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| 374 | protected void visitBefore(RepeatedSequence node) {
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[12] | 375 | buf.append("{");
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[11] | 376 | }
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| 377 |
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| 378 | protected void visitAfter(RepeatedSequence node) {
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[12] | 379 | buf.append("}");
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| 380 | if (node.isMorethanonce())
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| 381 | buf.append("+");
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[11] | 382 | }
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| 383 |
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| 384 | protected void visitBefore(Rule node) {
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[17] | 385 | if (lastWasSectionHeading)
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| 386 | buf.append("\n");
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| 387 |
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| 388 | lastWasSectionHeading=false;
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| 389 |
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[11] | 390 | if (node.getRulenumber() > 0)
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| 391 | buf.append(node.getRulenumber() + ". ");
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| 392 |
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| 393 | buf.append(node.getName() + " ::= ");
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| 394 | }
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| 395 |
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| 396 | protected void visitAfter(Rule node) {
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[21] | 397 | buf.append(";");
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| 398 | // appendComments(node);
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| 399 | buf.append("\n");
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[11] | 400 | }
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| 401 |
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| 402 | protected void visitBefore(RuleCombinator node) {
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| 403 | }
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| 404 |
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| 405 | protected void visitAfter(RuleCombinator node) {
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| 406 | }
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| 407 |
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| 408 | protected void visitBefore(RuleReference node) {
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[12] | 409 | buf.append(node.getRuleref().getName());
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[11] | 410 | }
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| 411 |
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| 412 | protected void visitAfter(RuleReference node) {
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| 413 | }
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| 414 |
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| 415 | protected void visitBefore(SectionHeading node) {
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[17] | 416 | if (!lastWasSectionHeading && !buf.substring(buf.length()-2).equals("\n\n"))
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[13] | 417 | buf.append("\n");
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| 418 |
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[17] | 419 | lastWasSectionHeading=true;
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| 420 | // if (!lastWasSectionHeading || !buf.substring(buf.length()-2).equals("\n\n"))
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| 421 | // if (!buf.substring(buf.length()-2).equals("\n\n"))
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| 422 | // buf.append("\n");
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| 423 |
|
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[13] | 424 | buf.append(node.getSectionHeader());
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[11] | 425 | }
|
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| 426 |
|
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| 427 | protected void visitAfter(SectionHeading node) {
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[17] | 428 | // buf.append("\n");
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[11] | 429 | }
|
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| 430 |
|
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| 431 | protected void visitBefore(SingleDefinition node) {
|
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| 432 | }
|
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| 433 |
|
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| 434 | protected void visitAfter(SingleDefinition node) {
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[12] | 435 | if (!isLastElement())
|
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| 436 | buf.append(" | ");
|
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| 437 |
|
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[11] | 438 | }
|
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| 439 |
|
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| 440 | protected void visitBefore(StringRule node) {
|
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| 441 | if (node.getLiteral() != null)
|
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| 442 | buf.append("\"" + node.getLiteral() + "\"");
|
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| 443 | else if (node.getColon() != null)
|
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[12] | 444 | buf.append("\"\"\"");
|
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[11] | 445 | }
|
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| 446 |
|
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| 447 | protected void visitAfter(StringRule node) {
|
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| 448 | }
|
---|
| 449 |
|
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| 450 |
|
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| 451 |
|
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[9] | 452 | }
|
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