Annotation of gforth/wordinfo.fs, revision 1.2

1.1       anton       1: \ WORDINFO.FS  V1.0                                    17may93jaw
                      2: 
                      3: \ May be cross-compiled
                      4: \ If you want check values then exclude comments,
                      5: \ but keep in mind that this can't be cross-compiled
                      6: 
                      7: INCLUDE look.fs
                      8: 
                      9: \ Wordinfo is a tool that checks a nfa
                     10: \ and finds out what wordtype we have
                     11: \ it is used in SEE.FS
                     12: 
                     13: : alias? ( nfa -- flag )
                     14:         dup name> look
                     15:         0= ABORT" WINFO: CFA not found"
                     16:         cell+
                     17:         2dup <>
                     18:         IF   nip dup 1 cells - here !
                     19:              count $1f and here cell+ place true
                     20:         ELSE 2drop false THEN ;
                     21: 
                     22: : var?  ( nfa -- flag )
                     23:         (name>)
1.2     ! pazsan     24:         >code-address ['] leavings >code-address = ;
1.1       anton      25: 
                     26: : con?  ( nfa -- flag )
                     27:         (name>)
1.2     ! pazsan     28:         >code-address ['] bl >code-address = ;
1.1       anton      29: 
                     30: : does? ( nfa -- flag )
                     31:         dup (name>)
1.2     ! pazsan     32:         >code-address ['] source >code-address =
1.1       anton      33:         dup IF swap (name>) cell+ @ here ! ELSE nip THEN ;
                     34: 
                     35: : defered? ( nfa -- flag )
                     36:         dup does?
                     37:         IF here @ ['] source cell+ @ =
                     38:            dup IF swap (name>) >body @ here ! ELSE nip THEN
                     39:         ELSE drop false THEN ;
                     40: 
                     41: : colon? ( nfa -- flag )
                     42:         (name>)
1.2     ! pazsan     43:         >code-address ['] does? >code-address = ;
1.1       anton      44: 
                     45: \ VALUE VCheck
                     46: 
                     47: \ : value? ( nfa -- flag )
                     48: \         dup does?
                     49: \         IF here @ ['] VCheck cell+ @ =
                     50: \            dup IF swap (name>) >body @ here ! ELSE nip THEN
                     51: \         ELSE drop false THEN ;
                     52: 
                     53: : prim? ( nfa -- flag )
                     54:         name>
                     55:         forthstart u< ;
                     56: 
                     57: \ None nestable IDs:
                     58: 
                     59: 1 CONSTANT Pri#         \ Primitives
                     60: 2 CONSTANT Con#         \ Constants
                     61: 3 CONSTANT Var#         \ Variables
                     62: 4 CONSTANT Val#         \ Values
                     63: 
                     64: \ Nestabe IDs:
                     65: 
                     66: 5 CONSTANT Doe#         \ Does part
                     67: 6 CONSTANT Def#         \ Defer
                     68: 7 CONSTANT Col#         \ Colon def
                     69: 
                     70: \ Nobody knows:
                     71: 
                     72: 8 CONSTANT Ali#         \ Alias
                     73: 
                     74: 9 CONSTANT Str#         \ Structure words
                     75: 
                     76: 10 CONSTANT Com#        \ Compiler directives : ; POSTPONE
                     77: 
                     78: CREATE InfoTable
                     79:         ' Alias? A, Ali# ,
                     80:         ' Con?   A, Con# ,
                     81:         ' Var?   A, Var# ,
                     82: \        ' Value? A, Val# ,
                     83:         ' Defered? A, Def# ,
                     84:         ' Does? A, Doe# ,
                     85:         ' Colon? A, Col# ,
                     86:         ' Prim? A, Pri# ,
                     87:         0 ,
                     88: 
                     89: : WordInfo ( nfa --- code )
                     90:         InfoTable
                     91:         BEGIN  dup @ dup
                     92:         WHILE  swap 2 cells + swap
                     93:                2 pick swap execute
                     94:         UNTIL
                     95:         1 cells - @ nip
                     96:         ELSE
                     97:         2drop drop 0
                     98:         THEN ;
                     99: 

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