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  1. // ragel -J Atoi.rl && javac Atoi.java && java Atoi 123 23 " -12" 21
  2. // output:
  3. // value = 12323
  4. // value = -1221
  5.  
  6. public class Atoi {
  7.     %% machine atoi;
  8.     %% write data;
  9.  
  10.     int cs;
  11.     boolean neg = false;
  12.     long val = 0;
  13.  
  14.     %% write init;
  15.  
  16.     private void integerFound(final long val) {
  17.         System.out.println("value = " + val);
  18.     }
  19.  
  20.     private void process(final char[] data) {
  21.         int p = 0;
  22.         int eof = 0;
  23.         final int pe;
  24.         if (data == null) {
  25.             pe = 0;
  26.         } else {
  27.             pe = data.length;
  28.         }
  29.         %%{
  30.             action set_neg {
  31.                 neg = true;
  32.             }
  33.  
  34.             action add_digit {
  35.                 val = val * 10 + (fc - '0');
  36.             }
  37.  
  38.             action readed {
  39.                 if (neg) {
  40.                     val *= -1;
  41.                 }
  42.                 integerFound(val);
  43.                 val = 0;
  44.                 neg = false;
  45.             }
  46.  
  47.             number = ('-'@set_neg|'+')? (digit@add_digit)+ %readed;
  48.             main := number (' ' number)*;
  49. /tmp/Atoi.rl[ragel]                                                                                                   ascii:112[0x70] pos:     1 line:   1:1/56
  50. :!cat Atoi.rl
  51. public class Atoi {
  52.     %% machine atoi;
  53.     %% write data;
  54.  
  55.     int cs;
  56.     boolean neg = false;
  57.     long val = 0;
  58.  
  59.     %% write init;
  60.  
  61.     private void integerFound(final long val) {
  62.         System.out.println("value = " + val);
  63.     }
  64.  
  65.     private void process(final char[] data) {
  66.         int p = 0;
  67.         int eof = 0;
  68.         final int pe;
  69.         if (data == null) {
  70.             pe = 0;
  71.         } else {
  72.             pe = data.length;
  73.         }
  74.         %%{
  75.             action set_neg {
  76.                 neg = true;
  77.             }
  78.  
  79.             action add_digit {
  80.                 val = val * 10 + (fc - '0');
  81.             }
  82.  
  83.             action readed {
  84.                 if (neg) {
  85.                     val *= -1;
  86.                 }
  87.                 integerFound(val);
  88.                 val = 0;
  89.                 neg = false;
  90.             }
  91.  
  92.             number = ('-'@set_neg|'+')? (digit@add_digit)+ %readed;
  93.             main := number (' ' number)*;
  94.             write exec;
  95.         }%%
  96.     }
  97.  
  98.     public static void main(final String[] args) {
  99.         Atoi atoi = new Atoi();
  100.         for (int i = 0; i < args.length; ++i) {
  101.             atoi.process(args[i].toCharArray());
  102.         }
  103.         atoi.process(null);
  104.     }
  105. }
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https://ideone.com/g3oHMe
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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