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/*
* @LANG: c++
* Show off concurrent abilities.
*/
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
using namespace std;
#define BUFSIZE 2048
struct Concurrent
{
int cur_char;
int start_word;
int start_comment;
int start_literal;
int cs;
// Initialize the machine. Invokes any init statement blocks. Returns 0
// if the machine begins in a non-accepting state and 1 if the machine
// begins in an accepting state.
void init( );
// Execute the machine on a block of data. Returns -1 if after processing
// the data, the machine is in the error state and can never accept, 0 if
// the machine is in a non-accepting state and 1 if the machine is in an
// accepting state.
void execute( const char *data, int len );
// Indicate that there is no more data. Returns -1 if the machine finishes
// in the error state and does not accept, 0 if the machine finishes
// in any other non-accepting state and 1 if the machine finishes in an
// accepting state.
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* $0 '*/'@1 ) >start_comment %end_comment;
comments = ( ( comment | any ) $1 %0 )*;
# 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;
void Concurrent::init( )
{
cur_char = 0;
%% write init;
}
void Concurrent::execute( const char *data, int len )
{
const char *p = data;
const char *pe = data + len;
const char *eof = pe;
%% write exec;
}
int Concurrent::finish( )
{
if ( cs == Concurrent_error )
return -1;
if ( cs >= Concurrent_first_final )
return 1;
return 0;
}
void test( const char *buf )
{
Concurrent concurrent;
concurrent.init();
concurrent.execute( buf, strlen(buf) );
if ( concurrent.finish() > 0 )
cout << "ACCEPT" << endl;
else
cout << "FAIL" << endl;
}
int main()
{
test(
"/* in a comment,\n"
" * ' and now in a literal string\n"
" */ \n"
" \n"
"the comment has now ended but the literal string lives on\n"
"\n"
"' comment closed\n" );
test( "/* * ' \\' */ \\' '\n" );
test( "/**/'\\''/*/*/\n" );
return 0;
}
#ifdef _____OUTPUT_____
word: 1 2
word: 4 5
word: 7 7
word: 9 16
word: 19 19
word: 21 21
word: 23 25
word: 27 29
word: 31 32
word: 34 34
word: 36 42
word: 44 49
word: 52 53
comment: 1 53
word: 58 60
word: 62 68
word: 70 72
word: 74 76
word: 78 82
word: 84 86
word: 88 90
word: 92 98
word: 100 105
word: 107 111
word: 113 114
word: 117 117
literal: 21 117
word: 119 125
word: 127 132
ACCEPT
word: 1 2
word: 4 4
word: 6 6
word: 8 9
word: 11 12
comment: 1 12
word: 14 15
word: 17 17
literal: 6 17
ACCEPT
comment: 1 4
literal: 5 8
word: 1 13
comment: 9 13
ACCEPT
#endif
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