ecflow.PartExpression

class ecflow.PartExpression

Bases: instance

PartExpression holds part of a trigger or complete expression.

Expressions can contain references to events, meters, user variables, repeat variables and generated variables. The part expression allows us to split a large trigger or complete expression into smaller ones

Constructor:

PartExpression(exp )
    string   exp: This represents the *first* expression

PartExpression(exp, bool and_expr)
    string   exp: This represents the expression
    bool and_exp: If true the expression is to be anded, with a previously added expression
                  If false the expression is to be 'ored', with a previously added expression

Usage: To add simple expression this class can be by-passed, i.e. can use:

task = Task('t1')
task.add_trigger( 't2 == active' )
task.add_complete( 't2 == complete' )

To add large triggers and complete expression:

exp1 = PartExpression('t1 == complete')
# a simple expression can be added as a string
....
task2.add_part_trigger( PartExpression('t1 == complete or t4 == complete') )
task2.add_part_trigger( PartExpression('t5 == active',True) )    # anded with first expression
task2.add_part_trigger( PartExpression('t7 == active',False) )   # or'ed with last expression added

The trigger for task2 is equivalent to ‘t1 == complete or t4 == complete and t5 == active or t7 == active’

PartExpression.and_expr((PartExpression)arg1) → bool

PartExpression.get_expression((PartExpression)arg1) → str :

returns the part expression as a string

PartExpression.or_expr((PartExpression)arg1) → bool