Examples of melnorme.lang.ide.ui.text.BlockHeuristicsScannner

melnorme.lang.ide.ui.text.BlockHeuristicsScannner
A scanner to parse block tokens, and determine the balance of open vs. close tokens. The blocks are specified by pairs of characters (must be one char in length each). The scanning is partition aware, it only parse partitions of a given type. The scanner is heuristic in that the block balance may not be 100% accurate according to the underlying language sematics of the source being scanned.

  protected BlockHeuristicsScannner createBlockHeuristicsScanner(IDocument doc) {
    BlockTokenRule[] blockTokens = array(new BlockTokenRule('{', '}'));
    if(parenthesesAsBlocks) {
      blockTokens = ArrayUtil.concat(blockTokens, new BlockTokenRule('(', ')'));
    }
    return new BlockHeuristicsScannner(doc, partitioning, contentType, blockTokens);
  }

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  protected BlockHeuristicsScannner createBlockHeuristicsScanner(IDocument doc) {
    // Default implementation
    String partitioning = IDocumentExtension3.DEFAULT_PARTITIONING;
    String contentType = IDocument.DEFAULT_CONTENT_TYPE;
    return new BlockHeuristicsScannner(doc, partitioning, contentType, new BlockTokenRule('{', '}'));
  }

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  public static int getRegionEnd(IRegion region) {
    return region.getOffset() + region.getLength();
  }
  
  protected void smartIndentAfterNewLine(IDocument doc, DocumentCommand cmd) throws BadLocationException {
    BlockHeuristicsScannner bhscanner = createBlockHeuristicsScanner(doc);
    // Find block balances of preceding text (line start to edit cursor)
    LineIndentResult nli = determineIndent(doc, bhscanner, doc.getLineOfOffset(cmd.offset), cmd.offset);
    cmd.text += nli.nextLineIndent;
    BlockBalanceResult blockInfo = nli.blockInfo;
    
    if(blockInfo.unbalancedOpens > 0) {
      IRegion lineRegion = doc.getLineInformationOfOffset(cmd.offset);
      int lineEnd = getRegionEnd(lineRegion);
      
      int postWsEndPos = AutoEditUtils.findEndOfWhiteSpace(doc, cmd.offset, lineEnd); 
      boolean hasPendingTextAfterEdit = postWsEndPos != lineEnd;
      if (fCloseBlocks && !hasPendingTextAfterEdit){
        if(bhscanner.shouldCloseBlock(blockInfo.rightmostUnbalancedBlockOpenOffset)) {
          //close block
          cmd.caretOffset = cmd.offset + cmd.text.length();
          cmd.shiftsCaret = false;
          String delimiter = TextUtilities.getDefaultLineDelimiter(doc);
          char openChar = doc.getChar(blockInfo.rightmostUnbalancedBlockOpenOffset);
          char closeChar = bhscanner.getClosingPeer(openChar); 
          cmd.text += delimiter + addIndent(nli.editLineIndent, blockInfo.unbalancedOpens - 1) + closeChar;
        }
      }
      return;
    }

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  protected int findEndOfWhiteSpace(IDocument doc, IRegion region) throws BadLocationException {
    return AutoEditUtils.findEndOfWhiteSpace(doc, region.getOffset(), getRegionEnd(region));
  }
  
  protected String determineExpectedIndent(IDocument doc, int line) throws BadLocationException {
    BlockHeuristicsScannner bhscanner = createBlockHeuristicsScanner(doc);
    LineIndentResult nli = determineIndent(doc, bhscanner, line);
    String expectedIndentStr = nli.nextLineIndent;
    return expectedIndentStr;
  }

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  public static BlockHeuristicsScannner createBlockHeuristicScannerWithSamplePartitioning(IDocument document) {
    String partitioning = SamplePartitionScanner.LANG_PARTITIONING;
    String contentType = IDocument.DEFAULT_CONTENT_TYPE;
    BlockTokenRule[] blockTokens = BlockHeuristicsScannnerTest.SAMPLE_BLOCK_TOKENS;
    return new BlockHeuristicsScannner(document, partitioning, contentType, blockTokens);
  }

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Related Classes of melnorme.lang.ide.ui.text.BlockHeuristicsScannner

melnorme.lang.ide.ui.editor.text.LangAutoEditStrategy

melnorme.lang.ide.ui.editor.text.LangAutoEditStrategyExt

melnorme.lang.ide.ui.text.Scanner_BaseTest

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