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/*
* Show off concurrent abilities.
*/
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
using namespace std;
#define BUFSIZE 2048
struct Concurrent
{
int cur_char;
int start_word;
int start_comment;
int start_literal;
int cs;
int init( );
int execute( const char *data, int len, bool isEof );
int finish( );
};
%%{
machine Concurrent;
action next_char {
cur_char += 1;
}
action start_word {
start_word = cur_char;
}
action end_word {
cout << "word: " << start_word <<
" " << cur_char-1 << endl;
}
action start_comment {
start_comment = cur_char;
}
action end_comment {
cout << "comment: " << start_comment <<
" " << cur_char-1 << endl;
}
action start_literal {
start_literal = cur_char;
}
action end_literal {
cout << "literal: " << start_literal <<
" " << cur_char-1 << endl;
}
# Count characters.
chars = ( any @next_char )*;
# Words are non-whitespace.
word = ( any-space )+ >start_word %end_word;
words = ( ( word | space ) $1 %0 )*;
# Finds C style comments.
comment = ( '/*' any* :>> '*/' ) >start_comment %end_comment;
comments = ( comment | any )**;
# Finds single quoted strings.
literalChar = ( any - ['\\] ) | ( '\\' . any );
literal = ('\'' literalChar* '\'' ) >start_literal %end_literal;
literals = ( ( literal | (any-'\'') ) $1 %0 )*;
main := chars | words | comments | literals;
}%%
%% write data;
int Concurrent::init( )
{
%% write init;
cur_char = 0;
return 1;
}
int Concurrent::execute( const char *data, int len, bool isEof )
{
const char *p = data;
const char *pe = data + len;
const char *eof = isEof ? pe : 0;
%% write exec;
if ( cs == Concurrent_error )
return -1;
if ( cs >= Concurrent_first_final )
return 1;
return 0;
}
int Concurrent::finish( )
{
if ( cs == Concurrent_error )
return -1;
if ( cs >= Concurrent_first_final )
return 1;
return 0;
}
Concurrent concurrent;
char buf[BUFSIZE];
int main()
{
concurrent.init();
while ( 1 ) {
int len = fread( buf, 1, BUFSIZE, stdin );
concurrent.execute( buf, len, len != BUFSIZE );
if ( len != BUFSIZE )
break;
}
if ( concurrent.finish() <= 0 )
cerr << "concurrent: error parsing input" << endl;
return 0;
}
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