/**
* Returns true if all relevant children of the widget managed by this
* instance are valid AND if #isOtherValid() returns true; otherwise returns
* false. Disabled children and children without validation
* are skipped and don't affect the result.
*
* The method emits the #isValidRequested() signal before calling
* #isOtherValid(), thus giving someone an opportunity to affect its result by
* calling #setOtherValid() from the signal handler. Note that #isOtherValid()
* returns true by default, until #setOtherValid( false ) is called.
*
* @note If #isOtherValid() returns true this method does a hierarchy scan, so
* it's a good idea to store the returned value in a local variable if needed
* more than once within a context of a single check.
*/
bool QIWidgetValidator::isValid() const
{
// wgt is null, we assume we're valid
if (!mWidget)
return true;
QIWidgetValidator *that = const_cast <QIWidgetValidator *> (this);
emit that->isValidRequested (that);
if (!isOtherValid())
return false;
QValidator::State state = QValidator::Acceptable;
foreach (Watched watched, mWatched)
{
if (watched.widget->inherits ("QLineEdit"))
{
QLineEdit *le = ((QLineEdit *) watched.widget);
Assert (le->validator());
if (!le->validator() || !le->isEnabled())
continue;
QString text = le->text();
int pos;
state = le->validator()->validate (text, pos);
}
else if (watched.widget->inherits ("QComboBox"))
{
QComboBox *cb = ((QComboBox *) watched.widget);
Assert (cb->validator());
if (!cb->validator() || !cb->isEnabled())
continue;
QString text = cb->lineEdit()->text();
int pos;
state = cb->lineEdit()->validator()->validate (text, pos);
}
if (state != QValidator::Acceptable)
{
that->mLastInvalid = watched;
that->mLastInvalid.state = state;
return false;
}
}
/* reset last invalid */
that->mLastInvalid = Watched();
return true;
}
int main( void ){
int i; //Loop counter.
int tempTokCtr = 0; //Count number of tokens.
char buffer[ 10000 ]; //For reading in tokens.
char temp[ 10000 ]; //Back-up buffer.
//Prompt user for source program name.
char sp[50]; //Name of input file.
printf( "What is the file name for your source program?\n" );
scanf( "%s", sp );
//Open file input stream to main input (the program).
FILE *fin = fopen( sp, "r" );
//Open file output stream to intermediary output file.
//In this file, unprocessed tokens will be stored for further processing.
FILE *temp_fout = fopen( "temp_output.txt", "w" );
//Procedure for creating intermediary output.
/** BEGIN PROCEDURE **/
while( fscanf( fin, "%s", buffer ) != EOF ){
int len = (int) strlen( buffer ); //Length of read-in token.
//For the length of the read-in token:
for( i = 0; i < len; i++ ){
//If we've reached the end of the buffer, and it's not a special symbol, print the token.
//If invalid symbols are present, they're ignored and taken care of later.
if( i == len-1 && !isSpecialSymbol( buffer[ i ] ) ){
fprintf( temp_fout, "%s ", buffer );
tempTokCtr++; //Increment the token counter.
}
//If the i-th element of the token is a special symbol.
else if( isSpecialSymbol( buffer[ i ] ) ){
//Brute force examine particular token cases: comment tokems, not equal, less-than-or-equal, ... , null, and odd.
if( len > 1 ){
if( buffer[ i ] == '/' && buffer[ i+1 ] == '*' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "/* " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+2, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( buffer[ i ] == '*' && buffer[ i+1 ] == '/' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "*/ " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+2, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( buffer[ i ] == '!' && buffer[ i+1 ] == '=' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "!= " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+2, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( buffer[ i ] == '<' && buffer[ i+1 ] == '=' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "<= " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+2, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( buffer[ i ] == '>' && buffer[ i+1 ] == '=' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, ">= " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+2, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( buffer[ i ] == ':' && buffer[ i+1 ] == '=' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, ":= " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+2, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( len > 3 && buffer[ i ] == 'n' && buffer[ i+1 ] == 'u' && buffer[ i+2 ] == 'l' && buffer[ i+3 ] =='l' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "null " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+4, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
else if( len > 2 && buffer[ i ] == 'o' && buffer[ i+1 ] == 'd' && buffer[ i+2 ] == 'd' ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "odd " );
tempTokCtr++;
strncpy( buffer, &buffer[i]+3, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
}
//Special symbol token at the beginning.
if( i == 0 ){
//Print symbol as individual token.
fprintf( temp_fout, "%c ", buffer[i] );
tempTokCtr++; //Increment token counter.
//Shift buffer, and update loop index.
//Similar procedure used for brute force token examination, and further token examination.
strncpy( buffer, &buffer[i]+1, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
//Valid symbol is splitting tokens within the buffer; split, print, and shift the tokens left of the valid symbol, including the symbol.
if( i > 0 ){
strncpy( temp, buffer, i );
temp[ i ] = '\0';
fprintf( temp_fout, "%s ", temp );
tempTokCtr++;
fprintf( temp_fout, "%c ", buffer[i] );
tempTokCtr++;
strncpy( buffer, &buffer[i]+1, len-1 );
buffer[ len - 1 ] = '\0';
len = (int) strlen( buffer );
i = -1;
}
}
}
}
/** END OF PROCEDURE **/
//Resource management.
fclose( temp_fout );
fclose( fin );
//Open file input stream to intermediary output created by the procedure above (unprocessed tokens).
fin = fopen( "temp_output.txt", "r" );
FILE *table = fopen( "lexeme_table.txt", "w" ); //Will hold the lexeme table.
FILE *list = fopen( "lexeme_list.txt", "w" ); //Will hold the lexeme list.
//Print header for lexeme table.
fprintf( table, "Lexeme Table:\n%15s%15s\n", "lexeme", "token type");
//Procedure to examine printed tokens.
/** BEGIN PROCEDURE **/
//Initialize.
int isResWord = -1; //If currently examined token is a reserved word, != -1; otherwise, = -1.
int len = 0; //Length of examined token.
int isComment = 0; //If currently reading in a comment, = 1; otherwise, = 0.
//For the length of tokens.
while( fscanf( fin, "%s ", buffer ) != EOF ){
//fscanf( fin, "%s", buffer ); //Read in token.
len = (int) strlen( buffer ); //Get token string length.
//Recognize beginning of comment block.
if( !strcmp( buffer, "/*" ) ){
isComment = 1;
}
//Recognize end of comment block.
else if( isComment == 1 && !strcmp( buffer, "*/" ) ){
isComment = 0;
}
//Only read in tokens while not examining a comment block.
else if( !isComment ){
//Error detection by token.
if( detectError( buffer ) ){
fclose( fin );
fclose( table );
fclose( list );
exit( 0 );
}
//Is the current token a reserved word? Print to table and list appropriately.
isResWord = isReservedWord( buffer );
if( isResWord != -1 ){
fprintf( table, "%15s%15d\n", buffer, isResWord );
fprintf( list, "%d ", isResWord );
}
//Is the current token an identifier? Print to table and list appropriately.
else if( isalpha( buffer[0] ) ){
fprintf( table, "%15s%15d\n", buffer, 2 );
fprintf( list, "2 %s ", buffer );
}
//Is the current token a number? Print to table and list appropriately.
else if( isdigit( buffer[0] ) ){
fprintf( table, "%15s%15d\n", buffer, 3 );
fprintf( list, "3 %s ", buffer );
}
//Otherwise, our token is some other valid symbol (checked for errors above). Print appropriately.
else{
fprintf( table, "%15s%15d\n", buffer, isOtherValid( buffer ) );
fprintf( list, "%d ", isOtherValid( buffer ) );
}
}
}
//Resource management.
fclose( fin );
fclose( table );
fclose( list );
/** END OF PROCEDURE **/
//Procedure to copy and source program.
/** BEGIN PROCEDURE **/
fin = fopen( sp, "r" ); //File containing source program.
FILE *source = fopen( "source_program.txt", "w" ); //File to copy source program to.
char copy; //Used to copy file, character by character.
//Copy character by character, until end of file.
while( ( copy = fgetc( fin ) ) != EOF )
fputc( copy, source );
//Resource management.
fclose( fin );
fclose( source );
remove( "temp_output.txt" ); //Delete intermediary output.
/** END OF PROCEDURE **/
return 0;
} //End of main.
