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  1. %{
  2. /*
  3.  * We now build a lexical analyzer to be used by a higher-level parser.
  4.  */
  5.  
  6. #include "y.tab.h"    /* token codes from the parser */
  7.  
  8. #define   LOOKUP 0   /* default - not a defined word type. */
  9.  
  10. int state;
  11.  
  12. %}
  13.  
  14. %%
  15.  
  16. \n    { state = LOOKUP; }
  17.  
  18. \.\n  {     state = LOOKUP;
  19.             return 0;  /* end of sentence */
  20.       }
  21.  
  22. ^verb { state = VERB; }
  23. ^adj  { state = ADJECTIVE; }
  24. ^adv  { state = ADVERB; }
  25. ^noun { state = NOUN; }
  26. ^prep { state = PREPOSITION; }
  27. ^pron { state = PRONOUN; }
  28. ^conj { state = CONJUNCTION; }
  29.  
  30. [a-zA-Z]+ {
  31.            if(state != LOOKUP) {
  32.             add_word(state, yytext);
  33.            } else {
  34.             switch(lookup_word(yytext)) {
  35.             case VERB:
  36.               return(VERB);
  37.             case ADJECTIVE:
  38.               return(ADJECTIVE);
  39.             case ADVERB:
  40.               return(ADVERB);
  41.             case NOUN:
  42.               return(NOUN);
  43.             case PREPOSITION:
  44.               return(PREPOSITION);
  45.             case PRONOUN:
  46.               return(PRONOUN);
  47.             case CONJUNCTION:
  48.               return(CONJUNCTION);
  49.             default:
  50.               printf("%s: don't recognize\n", yytext);
  51.               /* don't return, just ignore it */
  52.             }
  53.             }
  54.           }
  55. .    ;
  56.  
  57. %%
Success #stdin #stdout #stderr 0.02s 6320KB
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Standard input is empty
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Standard output is empty
stderr
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ERROR: /home/9r2aTn/prog:6:1: Syntax error: Operator expected
ERROR: /home/9r2aTn/prog:57:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/XeEtDo
language:
Prolog (swi 7.6.4)
created:
6 years ago
visibility:
public

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