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named-rewrite

Input Stack:
name: String
rewritten: TimeSeriesExpr
original: TimeSeriesExpr
 ⇨ Output Stack:
TimeSeriesExpr
 
 

Create a macro-like operation that shows a simplified name in expression displays while executing the full expanded implementation. This allows complex operations to be represented with user-friendly names while maintaining the full implementation for execution.

When expressions are displayed or serialized, the simplified name will be shown instead of the complex expanded form. However, the actual evaluation uses the full rewritten expression to ensure correct behavior.

Parameters

  • original: The complex expression that performs the actual computation
  • rewritten: An equivalent but possibly optimized version of the expression
  • name: The simplified name to display instead of the complex expression

Examples

Create an avg macro that displays simply but executes the full sum/count/divide logic:

BeforeAfter
name,ssCpuUser,:eq,
:dup,
:dup,
:sum,
:swap,
:count,
:div

name,ssCpuUser,:eq,
:dup,
:dup,
:sum,
:swap,
:count,
:div,
avg,:named-rewrite

In this example, the complex expression :dup,:dup,:sum,:swap,:count,:div will execute to calculate the average, but when the expression is displayed, it will simply show avg.

  • :avg - A built-in macro that uses named-rewrite internally
  • Commonly used by macro implementations to provide clean user interfaces