Extended Attributes R←X ⎕ATX Y

This function provides information about a name in a workspace, including its usage, history, restrictions, role and origin.

Note: To retrieve this information for an unnamed value, wrap ⎕ATX in a dfn and use the name ⍵, for example {60⎕ATX'⍵'}

Y can be a simple character scalar, a simple or enclosed character vector, or a vector of character scalars and vectors (as least one must be a character vector) of the name(s) for which information is required.

X can be a scalar or a vector indicating the information required:

Group X Meaning Default  
Identity 0 Name ''  
Syntax 10 Function result (0: none or not a function, 1: explicit, ¯1: shy) 0  
11 Function valence (0: niladic, 1: monadic, 2: dyadic, ¯2: ambivalent) 0  
12 Operator valence: (0: not an operator, 1: monadic, 2: dyadic) 0  
Last edit 20 Author of last edit ''  
21 Number of days passed between 1899-12-31 at 00:00 UTC and last edit (includes fractional days) 0  
22 Local timestamp at last edit (format is the 7-item vector described by ⎕TS. See Timestamp) ⍬  
23 Number of bytes required for storage without sharing 0  
Restrictions 30 Source can be displayed ¯1  
31 Execution can be suspended mid-execution ¯1  
32 Responds to weak interrupt ¯1  
Class* 40 Syntactic supra-class (¯1: invalid name, 0: undefined, 1: label, 2: variable, 3: function, 4: operator, 8: event, 9: object) ¯1  
41 Syntactic sub-class (0: none, 1: traditional/plain, 2: field/dynamic/instance, 3: property/derived/primitive, 4: class, 5: interface, 6: external, 7: external interface) 0  
42 Full syntactic class (sum of supra- and sub-class) ¯1  
Source 50 File name ''  
51 File encoding ''  
52 File checksum ''  
53 File line separators (13: Carriage Return, 10: Line Feed, 13 10: Carriage Return followed by Line Feed, 133: New Line, 11: Vertical Tab, 12: Form Feed, 8232: Line Separator, 8233: Paragraph Separator) ⍬  
54 Definition's offset from top 0  
55 Number of lines in definition 0  
Definition 60 Verbatim source (as typed) 0⍴⊂''  
61 Normalised source (with AUTOFORMAT=1 and TABSTOPS=4) 0⍴⊂''  
62 Most precise available source (verbatim with fallback to normalised) 0⍴⊂''  

* Names in the Class group that can return ¯1 (meaning "invalid name") might return a different value in future versions of Dyalog, including values that are not currently possible and ones that deviate from the current ⎕NC values.

R depends on the combination of X and Y:

X
Scalar Vector
Y Simple character scalar/vector Requested value (not enclosed) Vector of requested values
Enclosed character vector Requested value (enclosed) Scalar containing vector of requested values
Vector of character scalars/vectors Vector of requested values Outer shape from ⍴⍺, inner shape from ⍴⍵

Examples:

      Att
10 11 12 20 23 30 31 32 40 41 42 50 51 52 53 54 55

      foo←{⍵ ⍵}
      Att ⎕ATX 'foo'
┌─┬──┬─┬┬───┬──┬──┬──┬─┬─┬───┬┬┬┬┬─┬─┐
│1│¯2│0││616│¯1│¯1│¯1│3│2│3.2│││││0│0│
└─┴──┴─┴┴───┴──┴──┴──┴─┴─┴───┴┴┴┴┴─┴─┘

      x←42
      Att ⎕ATX 'x'
┌─┬─┬─┬┬──┬──┬──┬──┬─┬─┬───┬┬┬┬┬─┬─┐
│0│0│0││32│¯1│¯1│¯1│2│1│2.1│││││0│0│
└─┴─┴─┴┴──┴──┴──┴──┴─┴─┴───┴┴┴┴┴─┴─┘

      10 11 12 30 31 32 40 41 42 ⎕ATX 'x' 'foo'
┌───┬────┬───┬─────┬─────┬─────┬───┬───┬───────┐
│0 1│0 ¯2│0 0│¯1 ¯1│¯1 ¯1│¯1 ¯1│2 3│1 2│2.1 3.2│
└───┴────┴───┴─────┴─────┴─────┴───┴───┴───────┘

      2 ⎕FIX'foo ← {' '⍵ ⍵ }'
      60 61 ⎕ATX 'foo'
┌───────────────┬──────────────────┐
│┌───────┬─────┐│┌──────┬─────────┐│
││foo ← {│⍵ ⍵ }│││ foo←{│     ⍵ ⍵}││
│└───────┴─────┘│└──────┴─────────┘│
└───────────────┴──────────────────┘

      src←':namespace c' ':endnamespace' '' 'range←{⍺↓⍳⍵}'
      2 ⎕FIX src
      55 54 ⎕ATX'c' 'range'
┌───┬───┐
│2 1│0 3│
└───┴───┘

      2 1↑¨0 3↓¨⊂src
┌────────────────────────────┬──────────────┐
│┌────────────┬─────────────┐│┌────────────┐│
││:namespace c│:endnamespace│││range←{⍺↓⍳⍵}││
│└────────────┴─────────────┘│└────────────┘│
└────────────────────────────┴──────────────┘