Hacktoberfest 2026: los issues que los mantenedores marcaron para octubre, abiertos y aptos para principiantes. Explorar issues de Hacktoberfest

CSS pv() function missing in Phoebus

Abierto
  • ¿Algo no está bien?
#3,745 1 comentario 0 reacciones 0 asignados Ver en GitHub

Los mantenedores suelen responder en 2 días

Nadie ha tomado este issue todavía.

Evaluación

Dificultad
5/5
Tiempo estimado
Más de una semana
Aptitud para principiantes
35/100
Tipo de issue
Nueva funcionalidad
Claridad
Bastante claro
Estado de actividad
Estancado
Stack tecnológico
java
Área
backend

Línea de trabajo

The issue describes a missing pv() expression function and gives a nested expression example, but names no implementation files or tests. First check how Phoebus currently parses backtick expressions and whether they support nested evaluation; then assess the scope of adding pv() as an alternative. Done would mean the example can resolve the computed PV name and retrieve its value, with tests covering that behavior.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Many of the functions available in CS-Studio are also available in Phoebus, however I have noticed that one that we make heavy use of is missing and that is the pv() function. This basically turns whatever is inside it into a PV object that CSS then gets the value of.

In many instances we can just replace that with the Phoebus syntax using backticks ``.

However there are some cases that do not work in Phoebus, for example, functions within the backticks or nested backticks. An example of what was done in CSS is shown below:

=pv(concat(pv("XXX:NAME:OF:PV"), ":HELLO"))

where:

  • pv("XXX:NAME:OF:PV") would return the value of this PV, which is a string with the name of another PV, e.g. XXX:NAME:OF:PV.val = "TEST:VAC:01"

  • concat(..., ":HELLO") takes the string PV value from above and appends "HELLO" to it to get a new PV name, e.g. "TEST:VAC:01:HELLO"

  • then =pv(...) gets the value of "TEST:VAC:01:HELLO"

As far as I can tell, there is no easy way of doing this in Phoebus except using scripts.

I was just wondering whether there was a reason that the pv() function from CSS wasn't re-implemented in Phoebus? Would it be beneficial to have it?

Lenguaje dominante
Java
Estrellas
130
Forks
132
Merge medio
2 d 11 h
PR fusionados (30 d)
19

Preparar el entorno

  • Sin Dockerfile ni archivo de Docker Compose
  • Tiene una plantilla de pull request
  • Sin guía de contribución

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

Más de ControlSystemStudio/phoebus

Todos los issues de ControlSystemStudio/phoebus

Issues similares

Más issues de Java

Recibe los nuevos issues en tu correo

Un resumen breve de issues de GitHub para principiantes.