Documentation Moodle ActiveProLearn

STATUS: Draft.

Freezes the execution stack context and prevents the execution of instructions from modifying it.

A number of instructions can alter the value of context variables when they execute. For example, creating a course category sets, by default, the current course category to the newly created category. A succession of category creations using the 'current' meta will create a succession of nested categories.

 ADD CATEGORY My Root TO id:1

 ADD CATEGORY Cat 1 TO current
 
 ADD CATEGORY Cat 2 TO current

 ADD CATEGORY Cat 3 TO current

Will give the following tree:

 Miscelaneous > My Root > Cat 1 > Cat 2 > Cat 3

To successively create “siblings” of the same category, the context must be frozen so that current always represents the initial category before the first addition. Thus:

 ADD CATEGORY My Root TO id:1
 
 FREEZE CONTEXT
 
 ADD CATEGORY Cat 1 TO current
 
 ADD CATEGORY Cat 2 TO current
 
 ADD CATEGORY Cat 3 TO current
 
 UNFREEZE CONTEXT

Will generate a tree like this:

• Miscelaneous
  • My root
    • Cat 1
    • Cat 2
    • Cat 3

  FREEZE CONTEXT

None

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