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package edu.rice.cs.drjava.model.definitions.reducedmodel;

import static edu.rice.cs.drjava.model.definitions.reducedmodel.ReducedModelStates.*;

/** Shadowing state that indicates normal, unshadowed text.
  * @version $Id: Free.java 5175 2010-01-20 08:46:32Z mgricken $
  */
public class Free extends ReducedModelState {
  public static final Free ONLY = new Free();
  
  private Free() { }
  
  /** Walk function for when we're not inside a string or comment. Mutually recursive with other walk functions.
    * <ol>
    *  <li> atEnd: return
    *  <li> If we find / *, * /, or / /, combine them into a single Brace, and keep the cursor on that Brace.
    *  <li> If current brace = //, go to next then call updateLineComment.<BR>
    *       If current brace = /*, go to next then call updateBlockComment.<BR>
    *       If current brace = ", go to next then call updateInsideDoubleQuote.<BR>
    *       Else, mark current brace as FREE, go to the next brace, and recur.
    * </ol>
    */
  ReducedModelState update(TokenList.Iterator copyCursor) {
    if (copyCursor.atEnd()) return STUTTER;
    
    _combineCurrentAndNextIfFind("/", "*", copyCursor);
    _combineCurrentAndNextIfFind("/", "/", copyCursor);
    _combineCurrentAndNextIfFind("","", copyCursor);
    //if a / preceeds a /* or a // combine them.
    _combineCurrentAndNextIfFind("/","/*",copyCursor);
    _combineCurrentAndNextIfFind("/","//",copyCursor);
    _combineCurrentAndNextIfEscape(copyCursor);
    
    String type = copyCursor.current().getType();
    if (type.equals("*/")) {
      copyCursor._splitCurrentIfCommentBlock(true,false);
      copyCursor.prev();
      return STUTTER;
    }
    else if (type.equals("//")) {
      // open comment blocks are not set commented, they're set free
      copyCursor.current().setState(FREE);
      copyCursor.next();
      return INSIDE_LINE_COMMENT;
    }
    else if (type.equals("/*")) {
      // open comment blocks are not set commented, they're set free
      copyCursor.current().setState(FREE);
      copyCursor.next();
      return INSIDE_BLOCK_COMMENT;
    }
    else if (type.equals("\'")) {
      // make sure this is a OPEN single quote
      if (copyCursor.current().isClosed()) {
        copyCursor.current().flip();
      }
      copyCursor.current().setState(FREE);
      copyCursor.next();
      return INSIDE_SINGLE_QUOTE;
    }
    else if (type.equals("\"")) {
      // make sure this is a OPEN quote
      if (copyCursor.current().isClosed()) {
        copyCursor.current().flip();
      }
      copyCursor.current().setState(FREE);
      copyCursor.next();
      return INSIDE_DOUBLE_QUOTE;
    }
    else {
      copyCursor.current().setState(FREE);
      copyCursor.next();
      return FREE;
    }
  }
}
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