dxb←{                                           ⍝ Drop eXtraneous Blanks.
    ⍺←' ' ⋄ 1<|≡⍵:(⊂⍺)∇¨⍵                       ⍝ nested?
    2<⍴⍴⍵:(¯1↓⍴⍵){(⍺,1↓⍴⍵)⍴⍵}⍺ ∇,[¯1↓⍳⍴⍴⍵]⍵     ⍝ array
    b←⍵∊⍺                                       ⍝ mask
    1≥⍴⍴⍵:(1↑b)↓(b⍲1↓b,1)/⍵                     ⍝ vector
    b←∧⌿b ⋄ (0,1↑b)↓(b⍲1↓b,1)/⍵                 ⍝ matrix
}

code_colours

test script

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