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Annotation of gforth/wordinfo.fs, revision 1.5

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"
1.4       pazsan     16: \       cell+
1.1       anton      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 )
1.4       pazsan     23:         cell+ (name>)
1.3       pazsan     24:         >code-address ['] udp >code-address = ;
1.1       anton      25: 
                     26: : con?  ( nfa -- flag )
1.4       pazsan     27:         cell+ (name>)
1.2       pazsan     28:         >code-address ['] bl >code-address = ;
1.1       anton      29: 
1.5     ! pazsan     30: : user?  ( nfa -- flag )
        !            31:         cell+ (name>)
        !            32:         >code-address ['] s0 >code-address = ;
        !            33: 
1.1       anton      34: : does? ( nfa -- flag )
1.4       pazsan     35:         cell+ dup (name>)
1.2       pazsan     36:         >code-address ['] source >code-address =
1.1       anton      37:         dup IF swap (name>) cell+ @ here ! ELSE nip THEN ;
                     38: 
                     39: : defered? ( nfa -- flag )
                     40:         dup does?
                     41:         IF here @ ['] source cell+ @ =
1.4       pazsan     42:            dup IF swap cell+ (name>) >body @ here ! ELSE nip THEN
1.1       anton      43:         ELSE drop false THEN ;
                     44: 
                     45: : colon? ( nfa -- flag )
1.4       pazsan     46:         cell+ (name>)
1.2       pazsan     47:         >code-address ['] does? >code-address = ;
1.1       anton      48: 
                     49: \ VALUE VCheck
                     50: 
                     51: \ : value? ( nfa -- flag )
                     52: \         dup does?
                     53: \         IF here @ ['] VCheck cell+ @ =
                     54: \            dup IF swap (name>) >body @ here ! ELSE nip THEN
                     55: \         ELSE drop false THEN ;
                     56: 
                     57: : prim? ( nfa -- flag )
                     58:         name>
                     59:         forthstart u< ;
                     60: 
                     61: \ None nestable IDs:
                     62: 
                     63: 1 CONSTANT Pri#         \ Primitives
                     64: 2 CONSTANT Con#         \ Constants
                     65: 3 CONSTANT Var#         \ Variables
                     66: 4 CONSTANT Val#         \ Values
                     67: 
                     68: \ Nestabe IDs:
                     69: 
                     70: 5 CONSTANT Doe#         \ Does part
                     71: 6 CONSTANT Def#         \ Defer
                     72: 7 CONSTANT Col#         \ Colon def
1.5     ! pazsan     73: 8 CONSTANT Use#         \ User variable
1.1       anton      74: 
                     75: \ Nobody knows:
                     76: 
1.5     ! pazsan     77: 9 CONSTANT Ali#         \ Alias
1.1       anton      78: 
1.5     ! pazsan     79: 10 CONSTANT Str#         \ Structure words
1.1       anton      80: 
1.5     ! pazsan     81: 11 CONSTANT Com#        \ Compiler directives : ; POSTPONE
1.1       anton      82: 
                     83: CREATE InfoTable
1.5     ! pazsan     84:         ' Prim?    A, Pri# ,
        !            85:         ' Alias?   A, Ali# ,
        !            86:         ' Con?     A, Con# ,
        !            87:         ' Var?     A, Var# ,
        !            88: \        ' Value?  A, Val# ,
1.1       anton      89:         ' Defered? A, Def# ,
1.5     ! pazsan     90:         ' Does?    A, Doe# ,
        !            91:         ' Colon?   A, Col# ,
        !            92:        ' User?    A, Use# ,
1.1       anton      93:         0 ,
                     94: 
                     95: : WordInfo ( nfa --- code )
                     96:         InfoTable
                     97:         BEGIN  dup @ dup
                     98:         WHILE  swap 2 cells + swap
                     99:                2 pick swap execute
                    100:         UNTIL
                    101:         1 cells - @ nip
                    102:         ELSE
                    103:         2drop drop 0
                    104:         THEN ;
                    105: