Class TCasScriptParameterValue

Unit

CastleScript

Declaration

type TCasScriptParameterValue = class(TCasScriptValue)

Description

This is a very special CastleScript value, used to represent user-defined function parameter. This poses itself as a TCasScriptValue descendant, and it has working AssignValue and everything else. This way it can be used in "Variables" list for various CastleScriptParser functions.

Except it's cheating: it doesn't actually store the value. Instead, it has SourceValue property that is used when doing AssignValue. So AssignValue is handled by SourceValue.AssignValue, and Execute is handled by SourceValue.Execute, and so reading/writing this works.

The advantage: the exact type of function parameter is not known, and still we can parse the function expression. This is crucial for parser implementation: when parsing you need to create TCasScriptParameterValue instance, but you don't know actual type of parameter that will be passed here.

Hierarchy

• TObject
• TCasScriptExpression
• TCasScriptValue
• TCasScriptParameterValue

Overview

Methods

	function CoreExecute: TCasScriptValue; override;
	procedure AssignValue(Source: TCasScriptValue); override;

Properties

property SourceValue: TCasScriptValue read FSourceValue write FSourceValue;

Description

Methods

	function CoreExecute: TCasScriptValue; override;

	procedure AssignValue(Source: TCasScriptValue); override;

Properties

	property SourceValue: TCasScriptValue read FSourceValue write FSourceValue;

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