com/ohrasys/cad/bnf/validator/BracketedTermValidator.java

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package com.ohrasys.cad.bnf.validator;
import com.ohrasys.cad.bnf.*;
import java.util.*;

public class BracketedTermValidator
  extends BNFRequiredTest {
  public BracketedTermValidator()
    throws BNFTestException {super(createTests());}

  private static BNFTestImplementor[] createTests()
    throws BNFTestException {
    BNFTestImplementor result[] = new BNFTestImplementor[] {
        new WhitespaceValidator(), new BNFNoFallthruTest('['),
        new FactorsValidator(), new BNFNoFallthruTest(']'),
        new WhitespaceValidator()
      };
    return result;
  }
  public Object collect(){
    if(formatting){
      return format(ValidatorUtils.flattenList((List)super.collect()));
    } else { 
      return ValidatorUtils.flattenList((List)super.collect());
    }
  }
  
  private Object format(Object tokens){
    if(!(tokens instanceof List)) return tokens;    
    ValidatorFormattingRules rules = null;
    StringBuffer result = new StringBuffer(((List)tokens).size());
    List tokenList = (List)tokens;
    for(int i = 0; i < tokenList.size(); i++){
      result.append(tokenList.get(i));
        result.append(" ");
    }
    StringBuffer newResult = new StringBuffer(result.toString().trim());
    newResult.deleteCharAt(newResult.indexOf(" "));
    newResult.deleteCharAt(newResult.lastIndexOf(" "));
    for(int i = 0; i < rules.groupingSymbolInteriorWhitespace; i++) {
      newResult.insert(newResult.indexOf("[")+1," ");
      newResult.insert(newResult.indexOf("]")," ");
    }
    return newResult.toString().trim();
  }}

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