/*
 * Created on 09.08.2003
 *
 */
package net.sourceforge.phpdt.internal.ui.util;

import org.eclipse.core.resources.IFile;

/**
 * @author khartlage
 *
 */
public class PHPFileUtil {
  public final static char[] SUFFIX_php = ".php".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_PHP = ".PHP".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_php3 = ".php3".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_PHP3 = ".PHP3".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_php4 = ".php4".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_PHP4 = ".PHP4".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_inc = ".inc".toCharArray(); //$NON-NLS-1$
  public final static char[] SUFFIX_INC = ".INC".toCharArray(); //$NON-NLS-1$

  public  static boolean isPHPFile(IFile file) {
    String extension = file.getFileExtension();
    return isPHPFileName(file.getLocation().toString());
  }

  /**
   * Returns true iff str.toLowerCase().endsWith(".php")
   * implementation is not creating extra strings.
   */
  public final static boolean isPHPFileName(String name) {
    return isPHP_FileName(name) || isPHP3_FileName(name) || isPHP4_FileName(name) || isINC_FileName(name);
  }
  //  static public boolean isPHPFile(String extension) {
  //    if ("php".equalsIgnoreCase(extension)
  //      || "php3".equalsIgnoreCase(extension)
  //      || "php4".equalsIgnoreCase(extension)
  //      || "inc".equalsIgnoreCase(extension)) {
  //      return true;
  //    }
  //    return false;
  //  }

  /**
   * Returns true iff str.toLowerCase().endsWith(".php")
   * implementation is not creating extra strings.
   */
  private final static boolean isPHP_FileName(String name) {
    int nameLength = name == null ? 0 : name.length();
    int suffixLength = SUFFIX_PHP.length;
    if (nameLength < suffixLength)
      return false;

    for (int i = 0, offset = nameLength - suffixLength; i < suffixLength; i++) {
      char c = name.charAt(offset + i);
      if (c != SUFFIX_php[i] && c != SUFFIX_PHP[i])
        return false;
    }
    return true;
  }

  /**
   * Returns true iff str.toLowerCase().endsWith(".php3")
   * implementation is not creating extra strings.
   */
  private final static boolean isPHP3_FileName(String name) {
    int nameLength = name == null ? 0 : name.length();
    int suffixLength = SUFFIX_PHP3.length;
    if (nameLength < suffixLength)
      return false;

    for (int i = 0, offset = nameLength - suffixLength; i < suffixLength; i++) {
      char c = name.charAt(offset + i);
      if (c != SUFFIX_php3[i] && c != SUFFIX_PHP3[i])
        return false;
    }
    return true;
  }

  /**
   * Returns true iff str.toLowerCase().endsWith(".php4")
   * implementation is not creating extra strings.
   */
  private final static boolean isPHP4_FileName(String name) {
    int nameLength = name == null ? 0 : name.length();
    int suffixLength = SUFFIX_PHP4.length;
    if (nameLength < suffixLength)
      return false;

    for (int i = 0, offset = nameLength - suffixLength; i < suffixLength; i++) {
      char c = name.charAt(offset + i);
      if (c != SUFFIX_php4[i] && c != SUFFIX_PHP4[i])
        return false;
    }
    return true;
  }

  /**
   * Returns true iff str.toLowerCase().endsWith(".inc")
   * implementation is not creating extra strings.
   */
  private final static boolean isINC_FileName(String name) {
    int nameLength = name == null ? 0 : name.length();
    int suffixLength = SUFFIX_INC.length;
    if (nameLength < suffixLength)
      return false;

    for (int i = 0, offset = nameLength - suffixLength; i < suffixLength; i++) {
      char c = name.charAt(offset + i);
      if (c != SUFFIX_inc[i] && c != SUFFIX_INC[i])
        return false;
    }
    return true;
  }
}