func_from_expr
From functionMap v1.0.0
by Gábor Csárdi
Get funcion(s) from a single expression. Usually a single function, but not necessarily.
Get funcion(s) from a single expression. Usually a single function, but not necessarily.
 Keywords
 internal
Usage
func_from_expr(expr, rfile, env)
Arguments
 expr
 Expression to evaluate.
 rfile
 Name of the R file being parsed, to be able to use it in a warning message.
 env
 Environment to store the parsed objects in.
Details
If the expression has a function
token and at least
one assignment, then we assume that it is a function definition
and evaluate it to get the function name.
This is the current algorithm:
 We evaluate the expression in
env
.  Then we check if there is anything new in
env
.  If there is a single new function, then we assume that the expression is the definition of this function, and use the function's name as expression name.
 Otherwise (zero or more than one new functions),
we assume that the expression is not a function defition
and we assign it to the function body (
_
).Othewise we assume it is not a function definition.
Value

A named list of length one. (It is easy to concatenate
these lists in the caller, hence the format. A list with a
name and an expression is less convenient.)
Community examples
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