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Diff for /gforth/kernel/recognizer.fs between versions 1.4 and 1.15

version 1.4, 2011/10/05 21:06:11 version 1.15, 2011/12/28 13:39:49
Line 15 Line 15
 \ interpret it, compile interpretation semantics  \ interpret it, compile interpretation semantics
 \ compile it, compile it as literal.  \ compile it, compile it as literal.
   
 : recognizer: ( xt1 xt2 xt3 xt4 -- ) Create 2swap swap 2, swap 2, ;  : recognizer: ( xt1 xt2 xt3 -- ) Create rot , swap , , ;
   
 (field) r>int     ( r-addr -- addr )  0 cells ,  (field) r>int      ( r-addr -- addr )  0 cells ,
 (field) r>compint ( r-addr -- )       1 cells ,  (field) r>comp     ( r-addr -- addr )  1 cells ,
 (field) r>comp    ( r-addr -- )       2 cells ,  (field) r>lit      ( r-addr -- addr )  2 cells ,
 (field) r>lit     ( r-addr -- )       3 cells ,  
   
 :noname ( ... nt -- ) name>int execute ;  
 :noname ( ... nt -- ) name>int compile, ;  
 :noname ( ... nt -- ) name>comp execute ;  
 :noname ( ... nt -- ) postpone Literal ;  
 recognizer: r:int-table  
   
 :noname ( addr u -- nt int-table true | addr u false )  ' no.extensions dup dup Create r:fail A, A, A,
   
   : lit, ( n -- ) postpone Literal ;
   : 2lit, ( n -- ) postpone 2Literal ;
   : nt, ( nt -- ) name>comp execute ;
   
   ' name>int
   :noname ( ... nt -- ... xt ) ['] nt, ;
   :noname ( ... nt -- xt ) ['] lit, ;
   Create r:word rot A, swap A, A,
   
   : word-recognizer ( addr u -- nt r:word | addr u r:fail )
     2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup      2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup
     IF      IF  nip nip r:word  ELSE  drop r:fail  THEN ;
         nip nip r:int-table true  EXIT  
     THEN ; Constant int-recognizer  
   
 ' noop  :noname  ['] noop ;
 :noname  postpone Literal ;  :noname  ['] lit, ;
 dup  dup
 dup  Create r:num rot A, swap A, A,
 recognizer: r:number  
   
 ' noop  :noname  ['] noop ;
 :noname  postpone 2Literal ;  :noname  ['] 2lit, ;
 dup  
 dup  dup
 recognizer: r:2number  Create r:2num rot A, swap A, A,
   
   \ snumber? should be implemented as recognizer stack
   
 :noname ( addr u -- nt int-table true | addr u false )  : num-recognizer ( addr u -- n/d table | addr u r:fail )
     2dup 2>r snumber?  dup      2dup 2>r snumber?  dup
     IF      IF
         2rdrop 0> IF  r:2number   ELSE  r:number  THEN  true  EXIT          2rdrop 0> IF  r:2num   ELSE  r:num  THEN  EXIT
     THEN      THEN
     drop 2r> false ; Constant num-recognizer      drop 2r> r:fail ;
   
 ' no.extensions dup 2dup recognizer: r:fail  
   
 \ recognizer stack  \ recognizer stack
   
 $10 Constant max-rec#  $10 Constant max-rec#
 Variable forth-recognizer max-rec# cells allot  
   
 : get-recognizers ( rec-addr -- xt1 .. xtn n )  : get-recognizers ( rec-addr -- xt1 .. xtn n )
     dup cell+ swap @ dup >r cells bounds ?DO      dup swap @ dup >r cells bounds swap ?DO
         I @          I @
     cell +LOOP  r> ;      cell -LOOP  r> ;
   
 : set-recognizers ( xt1 .. xtn n rec-addr -- )  : set-recognizers ( xt1 .. xtn n rec-addr -- )
     over max-rec# u>= abort" Too many recognizers"      over max-rec# u>= abort" Too many recognizers"
     2dup ! swap cells bounds swap ?DO      2dup ! cell+ swap cells bounds ?DO
         I !          I !
     cell -LOOP ;      cell +LOOP ;
   
   Variable forth-recognizer
   
 num-recognizer int-recognizer 2 forth-recognizer set-recognizers  ' word-recognizer A, ' num-recognizer A, max-rec# 2 - cells allot
   2 forth-recognizer !
   \ ' num-recognizer ' word-recognizer 2 forth-recognizer set-recognizers
   
 \ recognizer loop  \ recognizer loop
   
 : do-recognizer ( addr u rec-addr -- token table )  : do-recognizer ( addr u rec-addr -- token table )
     dup cell+ swap @ cells bounds ?DO      dup cell+ swap @ cells bounds ?DO
         I perform IF  UNLOOP  EXIT  THEN          I perform dup r:fail <>  IF  UNLOOP  EXIT  THEN  drop
     cell +LOOP      cell +LOOP
     r:fail ;      r:fail ;
   
   \ nested recognizer helper
   
   \ : nest-recognizer ( addr u -- token table | addr u r:fail )
   \   xxx-recognizer do-recognizer ;
   
 : interpreter-r ( addr u -- ... xt )  : interpreter-r ( addr u -- ... xt )
     forth-recognizer do-recognizer r>int @ ;      forth-recognizer do-recognizer r>int perform ;
   
   ' interpreter-r IS parser1
   
 : compiler-r ( addr u -- ... xt )  : compiler-r ( addr u -- ... xt )
     forth-recognizer do-recognizer r>comp @ ;      forth-recognizer do-recognizer r>comp perform ;
   
 : [ ( -- ) \  core      left-bracket  : [ ( -- ) \  core      left-bracket
     \G Enter interpretation state. Immediate word.      \G Enter interpretation state. Immediate word.
Line 95  num-recognizer int-recognizer 2 forth-re Line 105  num-recognizer int-recognizer 2 forth-re
     \G Enter compilation state.      \G Enter compilation state.
     ['] compiler-r     IS parser1 state on  ;      ['] compiler-r     IS parser1 state on  ;
   
   : >int      ( token table -- )  r>int perform execute ;
   : >comp     ( token table -- )  r>comp perform execute ;
   : >postpone ( token table -- )
       >r r@ r>lit perform execute r> r>comp perform compile, ;
   
 : postpone ( "name" -- ) \ core  : postpone ( "name" -- ) \ core
     \g Compiles the compilation semantics of @i{name}.      \g Compiles the compilation semantics of @i{name}.
     parse-name forth-recognizer do-recognizer >r      parse-name forth-recognizer do-recognizer >postpone ; immediate
     r@ r>lit perform r> r>comp @ compile, ; immediate  
   
Removed from v.1.4  
changed lines
  Added in v.1.15

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