/* gnu/regexp/RETokenNamedProperty.java
   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package gnu.java.util.regex;

import gnu.java.lang.CPStringBuilder;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

final class RETokenNamedProperty extends REToken
{
  String name;
  boolean insens;
  boolean negate;
  Handler handler;

  // Grouped properties
  static final byte[] LETTER = new byte[]{ Character.LOWERCASE_LETTER,
    Character.UPPERCASE_LETTER,
    Character.TITLECASE_LETTER,
    Character.MODIFIER_LETTER,
    Character.OTHER_LETTER
  };

  static final byte[] MARK = new byte[]{ Character.NON_SPACING_MARK,
    Character.COMBINING_SPACING_MARK,
    Character.ENCLOSING_MARK
  };

  static final byte[] SEPARATOR = new byte[]{ Character.SPACE_SEPARATOR,
    Character.LINE_SEPARATOR,
    Character.PARAGRAPH_SEPARATOR
  };

  static final byte[] SYMBOL = new byte[]{ Character.MATH_SYMBOL,
    Character.CURRENCY_SYMBOL,
    Character.MODIFIER_SYMBOL,
    Character.OTHER_SYMBOL
  };

  static final byte[] NUMBER = new byte[]{ Character.DECIMAL_DIGIT_NUMBER,
    Character.LETTER_NUMBER,
    Character.OTHER_NUMBER
  };

  static final byte[] PUNCTUATION = new byte[]{ Character.DASH_PUNCTUATION,
    Character.START_PUNCTUATION,
    Character.END_PUNCTUATION,
    Character.CONNECTOR_PUNCTUATION,
    Character.OTHER_PUNCTUATION,
    Character.INITIAL_QUOTE_PUNCTUATION,
    Character.FINAL_QUOTE_PUNCTUATION
  };

  static final byte[] OTHER = new byte[]{ Character.CONTROL,
    Character.FORMAT,
    Character.PRIVATE_USE,
    Character.SURROGATE,
    Character.UNASSIGNED
  };

  RETokenNamedProperty (int subIndex, String name, boolean insens,
                        boolean negate) throws REException
  {
    super (subIndex);
    this.name = name;
    this.insens = insens;
    this.negate = negate;
    handler = getHandler (name);
  }

  int getMinimumLength ()
  {
    return 1;
  }

  int getMaximumLength ()
  {
    return 1;
  }

  REMatch matchThis (CharIndexed input, REMatch mymatch)
  {
    char ch = input.charAt (mymatch.index);
    boolean retval = matchOneChar (ch);
    if (retval)
      {
        ++mymatch.index;
        return mymatch;
      }
    return null;
  }

  private boolean matchOneChar (char ch)
  {
    if (ch == CharIndexed.OUT_OF_BOUNDS)
      return false;

    boolean retval = handler.includes (ch);
    if (insens)
      {
        retval = retval ||
          handler.includes (toUpperCase (ch, unicodeAware)) ||
          handler.includes (toLowerCase (ch, unicodeAware));
      }

    if (negate)
      retval = !retval;
    return retval;
  }

  boolean returnsFixedLengthMatches ()
  {
    return true;
  }

  int findFixedLengthMatches (CharIndexed input, REMatch mymatch, int max)
  {
    int index = mymatch.index;
    int numRepeats = 0;
    while (true)
      {
        if (numRepeats >= max)
          break;
        char ch = input.charAt (index++);
        if (!matchOneChar (ch))
          break;
        numRepeats++;
      }
    return numRepeats;
  }

  void dump (CPStringBuilder os)
  {
    os.append ("\\").append (negate ? "P" : "p").append ("{" + name + "}");
  }

  private abstract static class Handler
  {
    public abstract boolean includes (char c);
  }

  private Handler getHandler (String name) throws REException
  {
    if (name.equals ("Lower") || name.equals ("Upper") ||
        // name.equals("ASCII") ||
        name.equals ("Alpha") ||
        name.equals ("Digit") ||
        name.equals ("Alnum") ||
        name.equals ("Punct") ||
        name.equals ("Graph") ||
        name.equals ("Print") ||
        name.equals ("Blank") ||
        name.equals ("Cntrl") ||
        name.equals ("XDigit") || name.equals ("Space"))
      {
        return new POSIXHandler (name);
      }
    if (name.startsWith ("In"))
      {
        try
        {
          name = name.substring (2);
          Character.UnicodeBlock block =
            Character.UnicodeBlock.forName (name);
          return new UnicodeBlockHandler (block);
        }
        catch (IllegalArgumentException e)
        {
          throw new REException ("Invalid Unicode block name: " + name,
                                 REException.REG_ESCAPE, 0);
        }
      }
    if (name.startsWith ("Is"))
      {
        name = name.substring (2);
      }

    // "grouped properties"
    if (name.equals ("L"))
      return new UnicodeCategoriesHandler (LETTER);
    if (name.equals ("M"))
      return new UnicodeCategoriesHandler (MARK);
    if (name.equals ("Z"))
      return new UnicodeCategoriesHandler (SEPARATOR);
    if (name.equals ("S"))
      return new UnicodeCategoriesHandler (SYMBOL);
    if (name.equals ("N"))
      return new UnicodeCategoriesHandler (NUMBER);
    if (name.equals ("P"))
      return new UnicodeCategoriesHandler (PUNCTUATION);
    if (name.equals ("C"))
      return new UnicodeCategoriesHandler (OTHER);

    if (name.equals ("Mc"))
      return new UnicodeCategoryHandler (Character.COMBINING_SPACING_MARK);
    if (name.equals ("Pc"))
      return new UnicodeCategoryHandler (Character.CONNECTOR_PUNCTUATION);
    if (name.equals ("Cc"))
      return new UnicodeCategoryHandler (Character.CONTROL);
    if (name.equals ("Sc"))
      return new UnicodeCategoryHandler (Character.CURRENCY_SYMBOL);
    if (name.equals ("Pd"))
      return new UnicodeCategoryHandler (Character.DASH_PUNCTUATION);
    if (name.equals ("Nd"))
      return new UnicodeCategoryHandler (Character.DECIMAL_DIGIT_NUMBER);
    if (name.equals ("Me"))
      return new UnicodeCategoryHandler (Character.ENCLOSING_MARK);
    if (name.equals ("Pe"))
      return new UnicodeCategoryHandler (Character.END_PUNCTUATION);
    if (name.equals ("Pf"))
      return new UnicodeCategoryHandler (Character.FINAL_QUOTE_PUNCTUATION);
    if (name.equals ("Cf"))
      return new UnicodeCategoryHandler (Character.FORMAT);
    if (name.equals ("Pi"))
      return new UnicodeCategoryHandler (Character.INITIAL_QUOTE_PUNCTUATION);
    if (name.equals ("Nl"))
      return new UnicodeCategoryHandler (Character.LETTER_NUMBER);
    if (name.equals ("Zl"))
      return new UnicodeCategoryHandler (Character.LINE_SEPARATOR);
    if (name.equals ("Ll"))
      return new UnicodeCategoryHandler (Character.LOWERCASE_LETTER);
    if (name.equals ("Sm"))
      return new UnicodeCategoryHandler (Character.MATH_SYMBOL);
    if (name.equals ("Lm"))
      return new UnicodeCategoryHandler (Character.MODIFIER_LETTER);
    if (name.equals ("Sk"))
      return new UnicodeCategoryHandler (Character.MODIFIER_SYMBOL);
    if (name.equals ("Mn"))
      return new UnicodeCategoryHandler (Character.NON_SPACING_MARK);
    if (name.equals ("Lo"))
      return new UnicodeCategoryHandler (Character.OTHER_LETTER);
    if (name.equals ("No"))
      return new UnicodeCategoryHandler (Character.OTHER_NUMBER);
    if (name.equals ("Po"))
      return new UnicodeCategoryHandler (Character.OTHER_PUNCTUATION);
    if (name.equals ("So"))
      return new UnicodeCategoryHandler (Character.OTHER_SYMBOL);
    if (name.equals ("Zp"))
      return new UnicodeCategoryHandler (Character.PARAGRAPH_SEPARATOR);
    if (name.equals ("Co"))
      return new UnicodeCategoryHandler (Character.PRIVATE_USE);
    if (name.equals ("Zs"))
      return new UnicodeCategoryHandler (Character.SPACE_SEPARATOR);
    if (name.equals ("Ps"))
      return new UnicodeCategoryHandler (Character.START_PUNCTUATION);
    if (name.equals ("Cs"))
      return new UnicodeCategoryHandler (Character.SURROGATE);
    if (name.equals ("Lt"))
      return new UnicodeCategoryHandler (Character.TITLECASE_LETTER);
    if (name.equals ("Cn"))
      return new UnicodeCategoryHandler (Character.UNASSIGNED);
    if (name.equals ("Lu"))
      return new UnicodeCategoryHandler (Character.UPPERCASE_LETTER);
    if (name.equals ("all"))
      return new Handler ()
      {
        public boolean includes (char c)
        {
          return true;
        }
      };
    if (name.startsWith ("java"))
      {
        try
        {
          Method m = Character.class.getMethod ("is" + name.substring (4),
                                                Character.TYPE);
          return new JavaCategoryHandler (m);
        }
        catch (NoSuchMethodException e)
        {
          throw new REException ("Unsupported Java handler: " + name, e,
                                 REException.REG_ESCAPE, 0);
        }
      }
    throw new REException ("unsupported name " + name, REException.REG_ESCAPE,
                           0);
  }

  private static class POSIXHandler extends Handler
  {
    private RETokenPOSIX retoken;
    public POSIXHandler (String name)
    {
      int posixId = RETokenPOSIX.intValue (name.toLowerCase ());
      if (posixId != -1)
          retoken = new RETokenPOSIX (0, posixId, false, false);
      else
          throw new RuntimeException ("Unknown posix ID: " + name);
    }
    public boolean includes (char c)
    {
      return retoken.matchOneChar (c);
    }
  }

  private static class UnicodeCategoryHandler extends Handler
  {
    public UnicodeCategoryHandler (byte category)
    {
      this.category = (int) category;
    }
    private int category;
    public boolean includes (char c)
    {
      return Character.getType (c) == category;
    }
  }

  private static class UnicodeCategoriesHandler extends Handler
  {
    public UnicodeCategoriesHandler (byte[]categories)
    {
      this.categories = categories;
    }
    private byte[] categories;
    public boolean includes (char c)
    {
      int category = Character.getType (c);
      for (int i = 0; i < categories.length; i++)
        if (category == categories[i])
          return true;
      return false;
    }
  }

  private static class UnicodeBlockHandler extends Handler
  {
    public UnicodeBlockHandler (Character.UnicodeBlock block)
    {
      this.block = block;
    }
    private Character.UnicodeBlock block;
    public boolean includes (char c)
    {
      Character.UnicodeBlock cblock = Character.UnicodeBlock.of (c);
      return (cblock != null && cblock.equals (block));
    }
  }

  /**
   * Handle the Java-specific extensions \p{javaX} where X
   * is a method from Character of the form isX
   *
   * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
   */
  private static class JavaCategoryHandler extends Handler
  {
    private Method method;

    public JavaCategoryHandler (Method m)
    {
      this.method = m;
    }

    public boolean includes (char c)
    {
      try
      {
        return (Boolean) method.invoke (null, c);
      }
      catch (IllegalAccessException e)
      {
        throw new InternalError ("Unable to access method " + method);
      }
      catch (InvocationTargetException e)
      {
        throw new InternalError ("Error invoking " + method);
      }
    }
  }

}