Parses an R expression written with the data pronouns .i$field, .t,
.b and .x into a small abstract syntax tree. Either a bare expression
or a ~ formula may be supplied; constant sub-expressions are evaluated in
the calling environment (or the formula's environment) and folded.
Usage
pronoun_expressions(expression)
Arguments
- expression
A pronoun expression, optionally written as a ~ formula.
Value
An it_node, the root of the parsed expression tree.
Examples
pronoun_expressions(.i$pension > 0)
#> call `>`
#> field .i$pension
#> lit 0
pronoun_expressions(~ .t - .b)
#> call `-`
#> time .t
#> field .i$birth
