#include <fstream.hfa>
#include <parseargs.hfa>
#include "parseconfig.hfa"


// *********************************** exceptions ***********************************


EHM_VIRTUAL_TABLE(Validation_Failure, Validation_Failure_main_table);
void ?{}( Validation_Failure & this, config_entry & entry ) with ( entry ) {
	this.virtual_table = &Validation_Failure_main_table;
	this.key = key;
	this.variable = variable;
}
void throwValidation_Failure( config_entry & entry ) {
	Validation_Failure exc = { entry };
}


// *********************************** main code ***********************************


struct KVPairs {
	int size, max_size;
	* [ char *, char * ] data;
};
void ?{}( KVPairs & kvp ) with ( kvp ) {	// default constructor
	size = 0; max_size = 0; data = 0p;
}
void ?{}( KVPairs & kvp, int size ) { 		// initialization
	kvp.[ size, max_size ] = [ 0, size ];
	kvp.data = alloc( size );
}
void ^?{}( KVPairs & kvp ) with ( kvp ) {	// destructor
	free( data );
	size = 0; max_size = 0; data = 0p;
}

void add_kv_pair( KVPairs kv_pairs, char * k, char * v ) with ( kv_pairs ) {
	if ( size == max_size ) {
		max_size *= 2;
		data = resize( data, max_size );
	}

	data[size] = [ k, v ];
	++size;
}

bool comments( ifstream & in, char * name ) {
	while () {
		in | name;
	  if ( fail( in ) ) return true;
	  if ( name[0] != '#' ) break;
		in | nl;	// ignore remainder of line
	} // for
	return false;
} // comments

// Parse configuration from a file formatted in shell style
KVPairs & parse_shell_config_format( const char * config_file, size_t num_entries ) {
	KVPairs kv_pairs = { num_entries };

	ifstream in;
	try {
		open( in, config_file );							// open the configuration file for input

		while () {
			char * key;
			char * value;
		  if ( comments( in, key ) ) break;			// eof ?
		  	// Should we just overwrite duplicate config entries? Having a hash map would make this much easier
			in | value;

			add_kv_pair( kv_pairs, key, value );

		  if ( fail( in ) ) break;
		  	in | nl; // ignore remainder of line
		} // for
	} catch( Open_Failure * ex; ex->istream == &in ) {
		exit | "Error: could not open input file \"" | config_file | "\"";
	} // try
	close( in );

	return kv_pairs;
}

// Parse configuration values from intermediate format
void parse_config( const char * config_file, config_entry entries[], size_t num_entries ) {
	KVPairs kv_pairs = parse_shell_config_format( config_file, num_entries );

	int entries_so_far = 0;
	for ( i; kv_pairs.size ) {
	  if ( entries_so_far == num_entries ) break;

		char * src_key, * src_value;
		[ src_key, src_value ] = kv_pairs.data[i];

		for ( j; num_entries ) {
		  if ( strcmp( src_key, entries[j].key ) != 0 ) continue;
		  	if ( entries[j].parse( src_value, entries[j].variable ) ) {
				++entries_so_far;
				break;
			}

			serr | "Value '" | src_value | "' for key '" | src_key | "' could not be parsed";
		}
	}
} // processConfigFile


// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa parseconfig.cfa" //
// End: //