ExprTools
ExprTools provides tooling for working with Julia expressions during metaprogramming. This package aims to provide light-weight performant tooling without requiring additional package dependencies.
Alternatively see the MacroTools package for more powerful set of tools.
ExprTools provides tooling for working with Julia expressions during metaprogramming. This package aims to provide light-weight performant tooling without requiring additional package dependencies.
Alternatively see the MacroTools package for more powerful set of tools.
Currently, this package provides the splitdef
, signature
and combinedef
functions which are useful for inspecting and manipulating function definition expressions.
splitdef
works on a function definition expression and returns aDict
of its parts.combinedef
takesDict
fromsplitdef
and builds it into an expression.signature
works on aMethod
returning a similarDict
that holds the parts of the expressions that would form its signature.
e.g.
julia> using ExprTools
julia> ex = :(
function Base.f(x::T, y::T) where T
x + y
end
)
:(function Base.f(x::T, y::T) where T
#= none:3 =#
x + y
end)
julia> def = splitdef(ex)
Dict{Symbol,Any} with 5 entries:
:args => Any[:(x::T), :(y::T)]
:body => quote…
:name => :(Base.f)
:head => :function
:whereparams => Any[:T]
julia> def[:name] = :g;
julia> def[:head] = :(=);
julia> def[:body] = :(x * y);
julia> g_expr = combinedef(def)
:((g(x::T, y::T) where T) = x * y)
julia> eval(g_expr)
g (generic function with 1 method)
julia> g_method = first(methods(g))
g(x::T, y::T) where T in Main
julia> signature(g_method)
Dict{Symbol,Any} with 3 entries:
:name => :g
:args => Expr[:(x::T), :(y::T)]
:whereparams => Any[:T]