package test;


/**
 * A Variable usage. It could be a first use, an in code use of an already declared var.
 * In fact I'm not sure for the moment I will keep this
 * @author Matthieu Casanova
 */
public class PHPVar {

  /** The name of the variable. It couldn't be changed. */
  private final String name;

  /** The value. It could change. */
  private String value;

  /**
   * Tell if the variable is a reference or not (given in function by &$varname,
   * or comming from a 'global' keyword.
   */
  private boolean reference;

  /**
   * Does the variable have a value or not.
   * If we don't know if it was initialized it should be set on true.
   * (when we have a global keyword for example)
   */
  private boolean initialized;

  /** This variable indicate if it is used or not in the code. */
  private boolean used;

  /**
   * We initialize the name and the value of the variable.
   * @param name the name of the variable
   * @param value the value of the variable
   */
  public PHPVar(String name, String value) {
    this.name = name;
    this.value = value;
    initialized = value != null;
  }

  /**
   * We initialize the name of the variable. The value will be null
   * @param name the name of the variable
   */
  public PHPVar(String name) {
    this.name = name;
  }

  /**
   * Initialize the variable name and set the initialization status.
   * @param name the name of the variable
   * @param initialized the initialization status (it should be true or it's unuseful)
   */
  public PHPVar(String name, boolean initialized) {
    this(name);
    this.initialized = initialized;
  }

  /**
   * Give a reference to the variable.
   * @param reference a reference
   */
  public void setReference(boolean reference) {
    this.reference = reference;
    if (reference) {// a reference variable status is unknown so is initialized for me
      //example : global
      initialized = true;
    }
  }

  /**
   * Tell if the variable is reference.
   * @return a boolean
   */
  public boolean isReference() {
    return reference;
  }

  public void setUsed(boolean used) {
    this.used = used;
  }

  public void setInitialized(boolean initialized) {
    this.initialized = initialized;
  }

  /**
   * Get the name of the variable.
   * @return a string containing the name of the variable
   */
  public String getName() {
    return name;
  }

  /**
   * Tell if the variable was used.
   * @return a boolean telling if the variable is used
   */
  public boolean isUsed() {
    return used;
  }

  /**
   * Return a human readable variable (:
   * @return  a string representation of the object.
   */
  public String toString() {
    if (value == null) {
      if (reference) {
        return "&$" + name;
      }
      return "$" + name;
    }
    if (reference) {
      return "&$" + name + "=" + value;
    }
    return "$" + name + "=" + value;
  }
}