forked from GiovineItalia/Gadfly.jl
/
varset.jl
74 lines (58 loc) · 1.63 KB
/
varset.jl
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# Generate large types where each field has a default value to which it's
# initialized.
macro varset(name::Symbol, table)
@assert table.head == :block
table = table.args
names = {}
vars = {}
defaults = {}
parameters = {}
parameters_expr = Expr(:parameters)
for row in table
if typeof(row) == Expr && row.head == :line
continue
end
if typeof(row) == Symbol
var = row
typ = :Any
default = :nothing
elseif row.head == :tuple
@assert 2 <= length(row.args) <= 3
var = row.args[1]
typ = row.args[2]
default = length(row.args) > 2 ? row.args[3] : :nothing
else
error("Bad varset systax")
end
push!(names, var)
push!(vars, :($(var)::$(typ)))
push!(defaults, default)
push!(parameters, Expr(:kw, var, default))
parameters_expr = Expr(:parameters, parameters...)
end
new_with_defaults = Expr(:call, :new, names...)
ex =
quote
type $(name)
$(vars...)
function $(name)()
new($(defaults...))
end
function $(name)($(parameters_expr))
$(new_with_defaults)
end
# shallow copy constructor
function $(name)(a::$(name))
b = new()
for name in $(name).names
setfield!(b, name, getfield(a, name))
end
b
end
end
function copy(a::$(name))
$(name)(a)
end
end
esc(ex)
end