/// <summary> /// http://www.ecma-international.org/ecma-262/5.1/#sec-9.2 /// </summary> /// <param name="o"></param> /// <returns></returns> public static bool ToBoolean(JsValue o) { if (o.IsObject()) { return true; } if (o == Undefined.Instance || o == Null.Instance) { return false; } if (o.IsBoolean()) { return o.AsBoolean(); } if (o.IsNumber()) { var n = o.AsNumber(); if (n.Equals(0) || double.IsNaN(n)) { return false; } else { return true; } } if (o.IsString()) { var s = o.AsString(); if (String.IsNullOrEmpty(s)) { return false; } else { return true; } } return true; }
/// <summary> /// http://www.ecma-international.org/ecma-262/5.1/#sec-9.8 /// </summary> /// <param name="o"></param> /// <returns></returns> public static string ToString(JsValue o) { if (o.IsObject()) { var p = o.AsObject() as IPrimitiveInstance; if (p != null) { o = p.PrimitiveValue; } } if (o.IsString()) { return o.AsString(); } if (o == Undefined.Instance) { return Undefined.Text; } if (o == Null.Instance) { return Null.Text; } if (o.IsBoolean()) { return o.AsBoolean() ? "true" : "false"; } if (o.IsNumber()) { return NumberPrototype.ToNumberString(o.AsNumber()); } return ToString(ToPrimitive(o, Types.String)); }
public static ObjectInstance ToObject(Engine engine, JsValue value) { if (value.IsObject()) { return value.AsObject(); } if (value == Undefined.Instance) { throw new JavaScriptException(engine.TypeError); } if (value == Null.Instance) { throw new JavaScriptException(engine.TypeError); } if (value.IsBoolean()) { return engine.Boolean.Construct(value.AsBoolean()); } if (value.IsNumber()) { return engine.Number.Construct(value.AsNumber()); } if (value.IsString()) { return engine.String.Construct(value.AsString()); } throw new JavaScriptException(engine.TypeError); }
/// <summary> /// http://www.ecma-international.org/ecma-262/5.1/#sec-9.3 /// </summary> /// <param name="o"></param> /// <returns></returns> public static double ToNumber(JsValue o) { // check number first as this is what is usually expected if (o.IsNumber()) { return o.AsNumber(); } if (o.IsObject()) { var p = o.AsObject() as IPrimitiveInstance; if (p != null) { o = p.PrimitiveValue; } } if (o == Undefined.Instance) { return double.NaN; } if (o == Null.Instance) { return 0; } if (o.IsBoolean()) { return o.AsBoolean() ? 1 : 0; } if (o.IsString()) { var s = o.AsString().Trim(); if (String.IsNullOrEmpty(s)) { return 0; } if ("+Infinity".Equals(s) || "Infinity".Equals(s)) { return double.PositiveInfinity; } if ("-Infinity".Equals(s)) { return double.NegativeInfinity; } // todo: use a common implementation with JavascriptParser try { if (!s.StartsWith("0x", StringComparison.OrdinalIgnoreCase)) { var start = s[0]; if (start != '+' && start != '-' && start != '.' && !char.IsDigit(start)) { return double.NaN; } double n = Double.Parse(s, NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign | NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite | NumberStyles.AllowExponent, CultureInfo.InvariantCulture); if (s.StartsWith("-") && n.Equals(0)) { return -0.0; } return n; } int i = int.Parse(s.Substring(2), NumberStyles.HexNumber, CultureInfo.InvariantCulture); return i; } catch (OverflowException) { return s.StartsWith("-") ? double.NegativeInfinity : double.PositiveInfinity; } catch { return double.NaN; } } return ToNumber(ToPrimitive(o, Types.Number)); }