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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef void effector(int);
  5. typedef struct transition transition;
  6. struct transition {
  7.   int state;
  8.   effector *effect;
  9. };
  10.  
  11. enum sigil { Letter, Slash, Star, EndOfFile, Squote, Dquote, Bslash };
  12. typedef enum sigil sigil;
  13.  
  14. sigil sigilify(int c) {
  15.   switch (c) {
  16.     case '/':  return Slash;
  17.     case '*':  return Star;
  18.     case EOF:  return EndOfFile;
  19.     case '\'': return Squote;
  20.     case '"':  return Dquote;
  21.     case '\\': return Bslash;
  22.     default:   return Letter;
  23.   }
  24. }
  25.  
  26. void emit    (int c) { putchar(c); }
  27. void slash   (int c) { putchar('/'); putchar(c); }
  28. void nothing (int c) { }
  29. void halt    (int c) { exit(EXIT_SUCCESS); }
  30.  
  31. #define T(state, sigil) (((state) << 4) | sigil)
  32.  
  33. int main() {
  34.   transition state = { 0, emit };
  35.   transition table[] = {
  36.  
  37.     [T(0, Slash)] =     { 1, nothing },
  38.     [T(0, Letter)] =    { 0, emit },
  39.     [T(0, Star)] =      { 0, emit },
  40.     [T(0, EndOfFile)] = { 0, halt },
  41.     [T(0, Squote)] =    { 6, emit },
  42.     [T(0, Dquote)] =    { 4, emit },
  43.     [T(0, Bslash)] =    { 0, emit  },
  44.  
  45.     [T(1, Slash)] =     { 0, slash },
  46.     [T(1, Letter)] =    { 0, slash },
  47.     [T(1, Star)] =      { 2, nothing },
  48.     [T(1, EndOfFile)] = { 0, halt },
  49.     [T(1, Squote)] =    { 0, slash },
  50.     [T(1, Dquote)] =    { 0, slash },
  51.     [T(1, Bslash)] =    { 0, slash },
  52.  
  53.     [T(2, Slash)] =     { 2, nothing },
  54.     [T(2, Letter)] =    { 2, nothing},
  55.     [T(2, Star)] =      { 3, nothing },
  56.     [T(2, EndOfFile)] = { 0, halt },
  57.     [T(2, Squote)] =    { 2, nothing },
  58.     [T(2, Dquote)] =    { 2, nothing },
  59.     [T(2, Bslash)] =    { 2, nothing },
  60.  
  61.     [T(3, Slash)] =     { 0, nothing },
  62.     [T(3, Letter)] =    { 2, nothing },
  63.     [T(3, Star)] =      { 2, nothing },
  64.     [T(3, EndOfFile)] = { 0, halt },
  65.     [T(3, Squote)] =    { 2, nothing },
  66.     [T(3, Dquote)] =    { 2, nothing },
  67.     [T(3, Bslash)] =    { 2, nothing },
  68.  
  69.     [T(4, Slash)] =     { 4, emit },
  70.     [T(4, Letter)] =    { 4, emit },
  71.     [T(4, Star)] =      { 4, emit },
  72.     [T(4, EndOfFile)] = { 0, halt },
  73.     [T(4, Squote)] =    { 4, emit },
  74.     [T(4, Dquote)] =    { 0, emit },
  75.     [T(4, Bslash)] =    { 5, emit },
  76.  
  77.     [T(5, Slash)] =     { 4, emit },
  78.     [T(5, Letter)] =    { 4, emit },
  79.     [T(5, Star)] =      { 4, emit },
  80.     [T(5, EndOfFile)] = { 0, halt },
  81.     [T(5, Squote)] =    { 4, emit },
  82.     [T(5, Dquote)] =    { 4, emit },
  83.     [T(5, Bslash)] =    { 4, emit},
  84.  
  85.     [T(6, Slash)] =     { 8, emit },
  86.     [T(6, Letter)] =    { 8, emit },
  87.     [T(6, Star)] =      { 8, emit },
  88.     [T(6, EndOfFile)] = { 0, halt },
  89.     [T(6, Squote)] =    { 8, emit },
  90.     [T(6, Dquote)] =    { 8, emit },
  91.     [T(6, Bslash)] =    { 7, emit },
  92.  
  93.     [T(7, Slash)] =     { 8, emit },
  94.     [T(7, Letter)] =    { 8, emit },
  95.     [T(7, Star)] =      { 8, emit },
  96.     [T(7, EndOfFile)] = { 8, emit },
  97.     [T(7, Squote)] =    { 8, emit },
  98.     [T(7, Dquote)] =    { 8, emit },
  99.     [T(7, Bslash)] =    { 8, emit },
  100.  
  101.     [T(8, Slash)] =     { 0, emit },
  102.     [T(8, Letter)] =    { 0, emit },
  103.     [T(8, Star)] =      { 0, emit },
  104.     [T(8, EndOfFile)] = { 0, halt },
  105.     [T(8, Squote)] =    { 0, emit },
  106.     [T(8, Dquote)] =    { 0, emit },
  107.     [T(8, Bslash)] =    { 0, emit },
  108.   };
  109.  
  110.   for (;;) {
  111.     int c = getchar();
  112.     (state = table[T(state.state, sigilify(c))]).effect(c);
  113.   }
  114. }
  115.  
Success #stdin #stdout 0s 9432KB
comments (?)
stdin
copy 
abc/*comment/*still comment*/def
" /*not a comment "
'/* broken syntax, but not a comment
stdout
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abcdef
" /*not a comment "
'/* broken syntax, but not a comment
https://ideone.com/94U6aJ
language:
C99 (gcc 8.3)
created:
5 years ago
visibility:
public

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