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Merge pull request #74 from piever/given
added given macro to plot dataframes
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Original file line number | Diff line number | Diff line change |
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""" | ||
`@df d x` | ||
Convert every symbol in the expression `x` with the respective column in `d` if it exists. | ||
If you want to avoid replacing the symbol, escape it with `^`. | ||
`NA` values are replaced with `NaN` for columns of `Float64` and `""` or `Symbol()` | ||
for strings and symbols respectively. | ||
""" | ||
macro df(d, x) | ||
esc(_df(d,x)) | ||
end | ||
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_df(d, x) = x | ||
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function _df(d, x::Expr) | ||
(x.head == :quote) && return :(StatPlots.select_column($d, $x)) | ||
if x.head == :call | ||
x.args[1] == :^ && length(x.args) == 2 && return x.args[2] | ||
x.args[1] == :cols && return :(hcat((StatPlots.convert_column($d[i]) for i in $(x.args[2]))...)) | ||
end | ||
return Expr(x.head, _df.(d, x.args)...) | ||
end | ||
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function _argnames(d, x::Expr) | ||
[_arg2string(d, s) for s in x.args[2:end] if not_kw(s)] | ||
end | ||
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not_kw(x) = true | ||
not_kw(x::Expr) = !(x.head in [:kw, :parameters]) | ||
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_arg2string(d, x) = stringify(x) | ||
function _arg2string(d, x::Expr) | ||
if x.head == :call && x.args[1] == :cols | ||
return :(reshape([(DataFrames.names($d)[i]) for i in $(x.args[2])], 1, :)) | ||
elseif x.head == :call && x.args[1] == :hcat | ||
return hcat(stringify.(x.args[2:end])...) | ||
elseif x.head == :hcat | ||
return hcat(stringify.(x.args)...) | ||
else | ||
return stringify(x) | ||
end | ||
end | ||
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stringify(x) = filter(t -> t != ':', string(x)) | ||
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select_column(df, s) = haskey(df, s) ? convert_column(df[s]) : s | ||
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convert_column(col) = col | ||
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function convert_column(col::AbstractDataArray{T}) where T | ||
try | ||
convert(Array, col) | ||
catch | ||
error("Missing data of type $T is not supported") | ||
end | ||
end | ||
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convert_column(col::AbstractDataArray{<:AbstractString}) = convert(Array, col, "") | ||
convert_column(col::AbstractDataArray{Symbol}) = convert(Array, col, Symbol()) | ||
convert_column(col::AbstractDataArray{<:Real}) = convert(Array, convert(DataArray{Float64}, col), NaN) |