Frontend: simplify custom predicates interfaces#83
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…se to define Statement Template arguments
The main idea is that when defining the arguments at a statement
template, it can be done from 3 different inputs:
i. `(&str, literal)`: this is to set a POD and a field, ie. `(POD, literal("field")`)
ii. `(&str, &str)`: this is to define a origin-key wildcard pair, ie. `(src_origin, src_dest)`
iii. `Value`: this is to define a literal value, ie. `0`
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The main idea is that when defining the arguments at a statement template, it can be done from 3 different inputs:
i.
(&str, literal): this is to set a POD and a field, ie.(POD, literal("field"))ii.
(&str, &str): this is to define a origin-key wildcard pair, ie.(src_origin, src_dest)iii.
Value: this is to define a literal value, ie.0(this is documented in the code, and it's usage can be seen at the frontend::custom tests)
This PR is in the direction of #80 .