.. _auto_string_eval:

*STRING EVAL*
=============

Evaluates a PHP string expression at runtime and returns one of two configurable string tokens depending on whether the expression resolves to 1 (truthy) or not. Use it for lightweight conditional branching within a workflow where the pass/fail decision can be expressed as an inline string expression.

When to use
-----------

Classification: **process**.

Tagged: ``branching``, ``conditional``, ``eval``, ``expression``, ``scalar``, ``string_eval``, ``token``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Expression
     - expression
     - scalar
     - —
     - ✓
     - A PHP-compatible string expression (e.g. '$a > 5') that will be evaluated at runtime; the result is compared to 1 to decide which token to return.
   * - Pass Token
     - pass_token
     - scalar
     - —
     - ✓
     - String value returned when the expression evaluates to 1 (truthy); defaults to 'yes' if left blank.
   * - Fail Token
     - fail_token
     - scalar
     - —
     - ✓
     - String value returned when the expression does not evaluate to 1; defaults to 'no' if left blank.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - string_eval_output_1
     - string_eval_output_1
     - scalar
     - The resolved token string — either the pass token or the fail token — depending on the outcome of the evaluated expression.

Disciplines
-----------

- platform.workflow

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=string_eval <https://www.d3view.com/api/workflow/example?id=string_eval>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>string_eval</code>. Schema hash: <code>1178db7b7f83</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>