Julia macro for Python like dict literals.

dict_macro.jl

module DictMacro

export @dict


"""
    @dict {k₁: v₁, k₂: v₂, …, kₙ₋₁: vₙ₋₁, kₙ: vₙ}

Use Python's `dict`, JSON like syntax for `Dict` literals.

# Usage

```
julia> @dict {"a": :b, 'c': 1, :d: π, Function: print, (1:10): range(1, 10)}
Dict{Any,Any} with 5 entries:
  1:10     => 1:10
  Function => print
  "a"      => :b
  :d       => π = 3.1415926535897...
  'c'      => 1
```
"""
macro dict(expr)
    if expr.head ≠ :cell1d || any(sub_expr.head ≠ :(:) for sub_expr ∈ expr.args)
        error("syntax: expected `{k₁: v₁, k₂: v₂, …, kₙ₋₁: vₙ₋₁, kₙ: vₙ}`")
    end

    block = Expr(:call, :Dict)

    for pair in expr.args
        k, v = pair.args
        push!(block.args, :($k => $v))
    end

    return esc(block)
end


end