Java TernaryValue.forBoolean方法代码示例

import com.google.javascript.rhino.jstype.TernaryValue; //导入方法依赖的package包/类
/**
 * Gets the boolean value of a node that represents a literal. This method
 * effectively emulates the <code>Boolean()</code> JavaScript cast function.
 */
static TernaryValue getBooleanValue(Node n) {
  switch (n.getType()) {
    case Token.STRING:
      return TernaryValue.forBoolean(n.getString().length() > 0);

    case Token.NUMBER:
      return TernaryValue.forBoolean(n.getDouble() != 0);

    case Token.NULL:
    case Token.FALSE:
    case Token.VOID:
      return TernaryValue.FALSE;

    case Token.NAME:
      String name = n.getString();
      if ("undefined".equals(name)
          || "NaN".equals(name)) {
        // We assume here that programs don't change the value of the keyword
        // undefined to something other than the value undefined.
        return TernaryValue.FALSE;
      } else if ("Infinity".equals(name)) {
        return TernaryValue.TRUE;
      }
      break;

    case Token.TRUE:
    case Token.ARRAYLIT:
    case Token.OBJECTLIT:
    case Token.REGEXP:
      return TernaryValue.TRUE;
  }

  return TernaryValue.UNKNOWN;
}
 

import com.google.javascript.rhino.jstype.TernaryValue; //导入方法依赖的package包/类
/**
 * The result of the comparison, or UNKNOWN if the
 * result could not be determined.
 */
private static TernaryValue compareAsNumbers(int op, Node left, Node right) {
  Double leftValue = NodeUtil.getNumberValue(left);
  if (leftValue == null) {
    return TernaryValue.UNKNOWN;
  }
  Double rightValue = NodeUtil.getNumberValue(right);
  if (rightValue == null) {
    return TernaryValue.UNKNOWN;
  }

  double lv = leftValue;
  double rv = rightValue;

  switch (op) {
    case Token.SHEQ:
    case Token.EQ:
      Preconditions.checkState(
          left.isNumber() && right.isNumber());
      return TernaryValue.forBoolean(lv == rv);
    case Token.SHNE:
    case Token.NE:
      Preconditions.checkState(
          left.isNumber() && right.isNumber());
      return TernaryValue.forBoolean(lv != rv);
    case Token.LE:
      return TernaryValue.forBoolean(lv <= rv);
    case Token.LT:
      return TernaryValue.forBoolean(lv <  rv);
    case Token.GE:
      return TernaryValue.forBoolean(lv >= rv);
    case Token.GT:
      return TernaryValue.forBoolean(lv >  rv);
    default:
      return TernaryValue.UNKNOWN;  // don't handle that op
  }
}
 

import com.google.javascript.rhino.jstype.TernaryValue; //导入方法依赖的package包/类
/**
 * Gets the boolean value of a node that represents a literal. This method
 * effectively emulates the <code>Boolean()</code> JavaScript cast function
 * except it return UNKNOWN for known values with side-effects, use
 * getImpureBooleanValue if you don't care about side-effects.
 */
static TernaryValue getPureBooleanValue(Node n) {
  switch (n.getType()) {
    case Token.STRING:
      return TernaryValue.forBoolean(n.getString().length() > 0);

    case Token.NUMBER:
      return TernaryValue.forBoolean(n.getDouble() != 0);

    case Token.NOT:
      return getPureBooleanValue(n.getLastChild()).not();

    case Token.NULL:
    case Token.FALSE:
      return TernaryValue.FALSE;

    case Token.VOID:
      if (!mayHaveSideEffects(n.getFirstChild())) {
        return TernaryValue.FALSE;
      }
      break;

    case Token.NAME:
      String name = n.getString();
      if ("undefined".equals(name)
          || "NaN".equals(name)) {
        // We assume here that programs don't change the value of the keyword
        // undefined to something other than the value undefined.
        return TernaryValue.FALSE;
      } else if ("Infinity".equals(name)) {
        return TernaryValue.TRUE;
      }
      break;

    case Token.TRUE:
    case Token.REGEXP:
      return TernaryValue.TRUE;

    case Token.ARRAYLIT:
    case Token.OBJECTLIT:
      if (!mayHaveSideEffects(n)) {
        return TernaryValue.TRUE;
      }
      break;
  }

  return TernaryValue.UNKNOWN;
}
 

import com.google.javascript.rhino.jstype.TernaryValue; //导入方法依赖的package包/类
/**
 * Gets the boolean value of a node that represents a literal. This method
 * effectively emulates the <code>Boolean()</code> JavaScript cast function
 * except it return UNKNOWN for known values with side-effects, use
 * getImpureBooleanValue if you don't care about side-effects.
 */
static TernaryValue getPureBooleanValue(Node n) {
  switch (n.getToken()) {
    case TEMPLATELIT:
      if (n.hasOneChild()) {
        return TernaryValue.forBoolean(!n.getFirstChild().getString().isEmpty());
      }
      break;

    case STRING:
      return TernaryValue.forBoolean(n.getString().length() > 0);

    case NUMBER:
      return TernaryValue.forBoolean(n.getDouble() != 0);

    case NOT:
      return getPureBooleanValue(n.getLastChild()).not();

    case NULL:
    case FALSE:
      return TernaryValue.FALSE;

    case VOID:
      if (!mayHaveSideEffects(n.getFirstChild())) {
        return TernaryValue.FALSE;
      }
      break;

    case NAME:
      String name = n.getString();
      if ("undefined".equals(name)
          || "NaN".equals(name)) {
        // We assume here that programs don't change the value of the keyword
        // undefined to something other than the value undefined.
        return TernaryValue.FALSE;
      } else if ("Infinity".equals(name)) {
        return TernaryValue.TRUE;
      }
      break;

    case TRUE:
    case REGEXP:
      return TernaryValue.TRUE;

    case FUNCTION:
    case CLASS:
    case NEW:
    case ARRAYLIT:
    case OBJECTLIT:
      if (!mayHaveSideEffects(n)) {
        return TernaryValue.TRUE;
      }
      break;
    default:
      break;
  }

  return TernaryValue.UNKNOWN;
}