PV formulae not supported #81
Description
Phoebus supports the PV names passed in being part of or containing formulae. This can take various forms, as seen below:
These do not currently work properly in cs-web-lib. Comparing Phoebus and cs-web-lib we can see the desired behaviour versus (left) the current behaviour (right)
To fix this, we should add support for:
- PV names that contain a PV name and an equation e.g.
=TEST-TEST-01:VAL + 5 - PV names that contain a sim PV and an equation e.g.
=sim://sine + 5 - Simple equations e.g.
=3+4 - Conditional formula e.g.
sim://ramp