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#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <string.h>
using std::cout;
using std::cerr;
using std::endl;
using std::ifstream;
using std::ofstream;
%%{
machine garticle;
write data;
}%%
int main( int argc, char **argv )
{
std::ios::sync_with_stdio(false);
if ( argc != 5 ) {
cerr << "usage: garticle <dump-file> <article-index> <section> <article>" << endl;
return -1;
}
char *dumpFile = argv[1];
char *articleIndex = argv[2];
char *section = argv[3];
char *article = argv[4];
ifstream dump( dumpFile );
if ( !dump.is_open() ) {
cerr << "error: unable to open " << dumpFile << " for reading" << endl;
return -1;
}
ifstream index( articleIndex );
if ( !index.is_open() ) {
cerr << "error: unable to open " << articleIndex << " for writing" << endl;
return -1;
}
long long articleNum = atoll(article);
index.seekg( articleNum * sizeof(long long) );
long long start, end;
index.read( (char*)&start, sizeof(long long) );
index.read( (char*)&end, sizeof(long long) );
long long len = end - start;
char *buf = new char[len];
dump.seekg( start-5 );
dump.read( buf, len );
char tn[2048];
long ptn = 0;
bool emit = false;
char *p = buf, *pe = buf+len;
int cs;
%%{
newline = '\n';
sp = [ \t\n\r];
name = [a-zA-Z:_0-9]+;
# Tag names.
tag_name = name
>{ ptn = 0; }
${ tn[ptn++] = *p; }
%{ tn[ptn++] = 0; }
;
attr_name = name;
# Attributes
attr_val = '"' ( [^"\\] | newline | ( '\\' any ) )* '"';
attr = attr_name '=' attr_val;
attrs = ( sp attr )*;
action maybe_open {
if ( strcmp( tn, section ) == 0 )
emit = true;
}
action maybe_close {
if ( strcmp( tn, section ) == 0 )
emit = false;
}
# Tags
tag = '<' tag_name %maybe_open attrs sp? ( '>' | '/>' );
close_tag = '</' tag_name %maybe_close '>';
# Character data, not spaces and not tag starts.
char_data_char = ^('<'|'&');
char_data = char_data_char+
${
if ( emit )
cout << *p;
} ;
defined_entities =
'quot' %{if (emit) cout << '"';} |
'amp' %{if (emit) cout << '&';} |
'apos' %{if (emit) cout << '\'';} |
'lt' %{if (emit) cout << '<';} |
'gt' %{if (emit) cout << '>';};
entity_ref = '&' defined_entities ';';
main := (
tag |
close_tag |
entity_ref |
char_data
)*
;
write init;
write exec;
}%%
if ( cs < garticle_first_final ) {
cerr << endl << endl << "garticle: error parsing dump file" << endl;
return 1;
}
//cout.write( buf, len );
cout << endl;
return 0;
}
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