5.4.3.7 RSet Statement

Note

This section describes the implementation of MS-VBAL §5.4.3.7 RSet Statement.

RSet (MS-VBAL §5.4.3.7) and LSet (MS-VBAL §5.4.3.6 LSet Statement; RD-VBAL §5.4.3.6 LSet Statement) are implemented.

Syntax

AST node	Instruction kind(s)	Notes
AssignmentStatementNode (Kind: RSet)	Simple	The same node shape as Let, Set and LSet.

See RD-VBAL §3.4.2 Simple Statements.

Runtime Semantics

RSet fits a value into the width the target already has, like LSet, but right-aligned. It takes the target's width from the target's current value, not from its declared type. Taking the width from the current value makes RSet meaningful on a variable-length String, and harmless on one.

RSet and LSet differ only in which end pads, and both truncate from the same end:

Value, compared with the target's width	RSet
Shorter	Right-aligned: padded at the start.
Longer	Truncated from the same end as LSet.

RSet has no UDT form: unlike LSet, it does not copy one UDT over another. See RD-VBAL §5.4.3.6 LSet Statement.

Implementation

RDCore.Runtime.Semantics.Statements.StatementRuntimeSemanticsProvider dispatches an AssignmentStatementNode whose Kind is LSet or RSet; see RD-VBAL §3.5.4 Execution.

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⏮️ RD-VBAL §5.4.3.6 LSet Statement | ⏭️ RD-VBAL §5.4.3.8 Let Statement