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//------------------------------------------------------------------------------
// <license file="ScriptableConst.cs">
//
// The use and distribution terms for this software are contained in the file
// named 'LICENSE', which can be found in the resources directory of this
// distribution.
//
// By using this software in any fashion, you are agreeing to be bound by the
// terms of this license.
//
// </license>
//------------------------------------------------------------------------------
// API class
using System;
namespace EcmaScript.NET
{
/// <summary>
/// This is interface that all objects in JavaScript must implement.
/// The interface provides for the management of properties and for
/// performing conversions.
/// <p>
/// Host system implementors may find it easier to extend the ScriptableObject
/// class rather than implementing Scriptable when writing host objects.
/// <p>
/// There are many static methods defined in ScriptableObject that perform
/// the multiple calls to the Scriptable interface needed in order to
/// manipulate properties in prototype chains.
/// <p>
///
/// </summary>
public interface IScriptable
{
/// <summary> Get the name of the set of objects implemented by this Java class.
/// This corresponds to the [[Class]] operation in ECMA and is used
/// by Object.prototype.toString() in ECMA.<p>
/// See ECMA 8.6.2 and 15.2.4.2.
/// </summary>
string ClassName
{
get;
}
/// <summary> Get the parent scope of the object.</summary>
/// <returns> the parent scope
/// </returns>
/// <summary> Set the parent scope of the object.</summary>
/// <param name="parent">the parent scope to set
/// </param>
IScriptable ParentScope
{
get;
set;
}
/// <summary> Get a named property from the object.
///
/// Looks property up in this object and returns the associated value
/// if found. Returns NOT_FOUND if not found.
/// Note that this method is not expected to traverse the prototype
/// chain. This is different from the ECMA [[Get]] operation.
///
/// Depending on the property selector, the runtime will call
/// this method or the form of <code>get</code> that takes an
/// integer:
/// <table>
/// <tr><th>JavaScript code</th><th>Java code</th></tr>
/// <tr><td>a.b </td><td>a.get("b", a)</td></tr>
/// <tr><td>a["foo"] </td><td>a.get("foo", a)</td></tr>
/// <tr><td>a[3] </td><td>a.get(3, a)</td></tr>
/// <tr><td>a["3"] </td><td>a.get(3, a)</td></tr>
/// <tr><td>a[3.0] </td><td>a.get(3, a)</td></tr>
/// <tr><td>a["3.0"] </td><td>a.get("3.0", a)</td></tr>
/// <tr><td>a[1.1] </td><td>a.get("1.1", a)</td></tr>
/// <tr><td>a[-4] </td><td>a.get(-4, a)</td></tr>
/// </table>
/// <p>
/// The values that may be returned are limited to the following:
/// <UL>
/// <LI>java.lang.Boolean objects</LI>
/// <LI>java.lang.String objects</LI>
/// <LI>java.lang.Number objects</LI>
/// <LI>EcmaScript.NET.Scriptable objects</LI>
/// <LI>null</LI>
/// <LI>The value returned by Context.getUndefinedValue()</LI>
/// <LI>NOT_FOUND</LI>
/// </UL>
/// </summary>
/// <param name="name">the name of the property
/// </param>
/// <param name="start">the object in which the lookup began
/// </param>
/// <returns> the value of the property (may be null), or NOT_FOUND
/// </returns>
object Get (string name, IScriptable start);
/// <summary> Get a property from the object selected by an integral index.
///
/// Identical to <code>get(String, Scriptable)</code> except that
/// an integral index is used to select the property.
///
/// </summary>
/// <param name="index">the numeric index for the property
/// </param>
/// <param name="start">the object in which the lookup began
/// </param>
/// <returns> the value of the property (may be null), or NOT_FOUND
/// </returns>
object Get (int index, IScriptable start);
/// <summary> Indicates whether or not a named property is defined in an object.
///
/// Does not traverse the prototype chain.<p>
///
/// The property is specified by a String name
/// as defined for the <code>get</code> method.<p>
///
/// </summary>
/// <param name="name">the name of the property
/// </param>
/// <param name="start">the object in which the lookup began
/// </param>
/// <returns> true if and only if the named property is found in the object
/// </returns>
bool Has (string name, IScriptable start);
/// <summary> Indicates whether or not an indexed property is defined in an object.
///
/// Does not traverse the prototype chain.<p>
///
/// The property is specified by an integral index
/// as defined for the <code>get</code> method.<p>
///
/// </summary>
/// <param name="index">the numeric index for the property
/// </param>
/// <param name="start">the object in which the lookup began
/// </param>
/// <returns> true if and only if the indexed property is found in the object
/// </returns>
bool Has (int index, IScriptable start);
/// <summary> Sets a named property in this object.
/// <p>
/// The property is specified by a string name
/// as defined for <code>get</code>.
/// <p>
/// The possible values that may be passed in are as defined for
/// <code>get</code>. A class that implements this method may choose
/// to ignore calls to set certain properties, in which case those
/// properties are effectively read-only.<p>
/// For properties defined in a prototype chain,
/// use <code>putProperty</code> in ScriptableObject. <p>
/// Note that if a property <i>a</i> is defined in the prototype <i>p</i>
/// of an object <i>o</i>, then evaluating <code>o.a = 23</code> will cause
/// <code>set</code> to be called on the prototype <i>p</i> with
/// <i>o</i> as the <i>start</i> parameter.
/// To preserve JavaScript semantics, it is the Scriptable
/// object's responsibility to modify <i>o</i>. <p>
/// This design allows properties to be defined in prototypes and implemented
/// in terms of getters and setters of Java values without consuming slots
/// in each instance.<p>
/// <p>
/// The values that may be set are limited to the following:
/// <UL>
/// <LI>java.lang.Boolean objects</LI>
/// <LI>java.lang.String objects</LI>
/// <LI>java.lang.Number objects</LI>
/// <LI>EcmaScript.NET.Scriptable objects</LI>
/// <LI>null</LI>
/// <LI>The value returned by Context.getUndefinedValue()</LI>
/// </UL><p>
/// Arbitrary Java objects may be wrapped in a Scriptable by first calling
/// <code>Context.toObject</code>. This allows the property of a JavaScript
/// object to contain an arbitrary Java object as a value.<p>
/// Note that <code>has</code> will be called by the runtime first before
/// <code>set</code> is called to determine in which object the
/// property is defined.
/// Note that this method is not expected to traverse the prototype chain,
/// which is different from the ECMA [[Put]] operation.
/// </summary>
/// <param name="name">the name of the property
/// </param>
/// <param name="start">the object whose property is being set
/// </param>
/// <param name="value">value to set the property to
/// </param>
object Put (string name, IScriptable start, object value);
/// <summary> Sets an indexed property in this object.
/// <p>
/// The property is specified by an integral index
/// as defined for <code>get</code>.<p>
///
/// Identical to <code>put(String, Scriptable, Object)</code> except that
/// an integral index is used to select the property.
///
/// </summary>
/// <param name="index">the numeric index for the property
/// </param>
/// <param name="start">the object whose property is being set
/// </param>
/// <param name="value">value to set the property to
/// </param>
object Put (int index, IScriptable start, object value);
/// <summary> Removes a property from this object.
/// This operation corresponds to the ECMA [[Delete]] except that
/// the no result is returned. The runtime will guarantee that this
/// method is called only if the property exists. After this method
/// is called, the runtime will call Scriptable.has to see if the
/// property has been removed in order to determine the boolean
/// result of the delete operator as defined by ECMA 11.4.1.
/// <p>
/// A property can be made permanent by ignoring calls to remove
/// it.<p>
/// The property is specified by a String name
/// as defined for <code>get</code>.
/// <p>
/// To delete properties defined in a prototype chain,
/// see deleteProperty in ScriptableObject.
/// </summary>
/// <param name="name">the identifier for the property
/// </param>
void Delete (string name);
/// <summary> Removes a property from this object.
///
/// The property is specified by an integral index
/// as defined for <code>get</code>.
/// <p>
/// To delete properties defined in a prototype chain,
/// see deleteProperty in ScriptableObject.
///
/// Identical to <code>delete(String)</code> except that
/// an integral index is used to select the property.
///
/// </summary>
/// <param name="index">the numeric index for the property
/// </param>
void Delete (int index);
/// <summary> Get the prototype of the object.</summary>
/// <returns> the prototype
/// </returns>
IScriptable GetPrototype ();
/// <summary> Set the prototype of the object.</summary>
/// <param name="prototype">the prototype to set
/// </param>
void SetPrototype (IScriptable prototype);
/// <summary> Get an array of property ids.
///
/// Not all property ids need be returned. Those properties
/// whose ids are not returned are considered non-enumerable.
///
/// </summary>
/// <returns> an array of Objects. Each entry in the array is either
/// a java.lang.String or a java.lang.Number
/// </returns>
object [] GetIds ();
/// <summary> Get the default value of the object with a given hint.
/// The hints are String.class for type String, Number.class for type
/// Number, Scriptable.class for type Object, and Boolean.class for
/// type Boolean. <p>
///
/// A <code>hint</code> of null means "no hint".
///
/// See ECMA 8.6.2.6.
///
/// </summary>
/// <param name="hint">the type hint
/// </param>
/// <returns> the default value
/// </returns>
object GetDefaultValue (Type hint);
/// <summary> The instanceof operator.
///
/// <p>
/// The JavaScript code "lhs instanceof rhs" causes rhs.hasInstance(lhs) to
/// be called.
///
/// <p>
/// The return value is implementation dependent so that embedded host objects can
/// return an appropriate value. See the JS 1.3 language documentation for more
/// detail.
///
/// <p>This operator corresponds to the proposed EMCA [[HasInstance]] operator.
///
/// </summary>
/// <param name="instance">The value that appeared on the LHS of the instanceof
/// operator
///
/// </param>
/// <returns> an implementation dependent value
/// </returns>
bool HasInstance (IScriptable instance);
}
}