Forth 2012: [ELSE]

Compilation:

Perform the execution semantics given below.

Execution:

( "<spaces>name ..." -- )

Skipping leading spaces, parse and discard space-delimited words from the parse area, including nested occurrences of [IF] ... [THEN] and [IF] ... [ELSE] ... [THEN], until the word [THEN] has been parsed and discarded. If the parse area becomes exhausted, it is refilled as with REFILL. [ELSE] is an immediate word.

See:

3.4.1 Parsing, A.15.6.2.2531 [ELSE].

Rationale:

Typical use: ... flag [IF] ... [ELSE] ... [THEN] ...

Implementation:

: [ELSE] ( -- )
    1 BEGIN                                          \ level
       BEGIN BL WORD COUNT DUP WHILE                  \ level adr len
         2DUP S" [IF]" COMPARE 0= IF                  \ level adr len
             2DROP 1+                                 \ level'
          ELSE                                        \ level adr len
            2DUP S" [ELSE]" COMPARE 0= IF             \ level adr len
                2DROP 1- DUP IF 1+ THEN               \ level'
            ELSE                                      \ level adr len
                S" [THEN]" COMPARE 0= IF              \ level
                   1-                                 \ level'
               THEN
             THEN
          THEN ?DUP 0= IF EXIT THEN                   \ level'
       REPEAT 2DROP                                   \ level
   REFILL 0= UNTIL                                   \ level
    DROP
; IMMEDIATE