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;

This item has no description. Showing description inherited from TCasScriptExpression.CoreExecute. More internal version of Execute. This doesn't necessarily check floating-point exceptions. Execute actually calls CoreExecute and then ClearExceptions. Also this doesn't try to convert EIntError and EMathError to ECasScriptAnyMathError. This is done by Execute. When one CastleScript CoreExecute calls another function, it can use CoreExecute instead of Execute. This way only one ClearExceptions will be needed for whole expression execution, instead of doing ClearExceptions after each function handler.

	procedure AssignValue(Source: TCasScriptValue); override;
This item has no description. Showing description inherited from TCasScriptValue.AssignValue. Assign value from Source to Self.

Properties

	property SourceValue: TCasScriptValue read FSourceValue write FSourceValue;
This item has no description.

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