// expression syntax:
// show title | actor [for actor | title ]
public string interpret(string expression)
{
List <string> result = new List <string>();
result.Add("Query Result: ");
char mainQuery = ' ';
char subQuery = ' ';
bool forUsed = false;
string searchString = null;
bool searchStarted = false;
bool searchEnded = false;
foreach (string currentToken in expression.Split(' '))
{
if (currentToken == null || currentToken.Equals(string.Empty))
{
continue;
}
if (currentToken.Equals("show"))
{
continue;
//show in all queries, not really used
}
else if (currentToken.Equals("title"))
{
if (mainQuery == ' ')
{
mainQuery = 'T';
}
else
{
if ((subQuery == ' ') && (forUsed))
{
subQuery = 'T';
}
}
}
else if (currentToken.Equals("actor"))
{
if (mainQuery == ' ')
{
mainQuery = 'A';
}
else
{
if ((subQuery == ' ') && (forUsed))
{
subQuery = 'A';
}
}
}
else if (currentToken.Equals("for"))
{
forUsed = true;
}
else if ((searchString == null) &&
(subQuery != ' ') &&
(currentToken.StartsWith("<")))
{
searchString = currentToken;
searchStarted = true;
if (currentToken.EndsWith(">"))
{
searchEnded = true;
}
}
else if ((searchStarted) && (!searchEnded))
{
searchString = searchString + " " + currentToken;
if (currentToken.EndsWith(">"))
{
searchEnded = true;
}
}
}
if (searchString != null)
{
searchString = searchString.Replace("<", null).Replace(">", null);
//remove <>
}
DvdAbstractExpression abstractExpression;
switch (mainQuery)
{
case 'A': {
switch (subQuery)
{
case 'T': {
abstractExpression =
new DvdActorTitleExpression(searchString);
break;
}
default: {
abstractExpression =
new DvdActorExpression();
break;
}
}
break;
}
case 'T': {
switch (subQuery)
{
case 'A': {
abstractExpression =
new DvdTitleActorExpression(searchString);
break;
}
default: {
abstractExpression = new DvdTitleExpression();
break;
}
}
break;
}
default: return(result.ToString());
}
result.Add(
abstractExpression.interpret(dvdInterpreterContext));
return(string.Join("", result.ToArray()));
}
// expression syntax:
// show title | actor [for actor | title ]
public string interpret(string expression)
{
List<string> result = new List<string>();
result.Add("Query Result: ");
char mainQuery = ' ';
char subQuery = ' ';
bool forUsed = false;
string searchString = null;
bool searchStarted = false;
bool searchEnded = false;
foreach (string currentToken in expression.Split(' '))
{
if( currentToken == null || currentToken.Equals(string.Empty) )
continue;
if (currentToken.Equals("show")) {
continue;
//show in all queries, not really used
} else if (currentToken.Equals("title")) {
if (mainQuery == ' ') {
mainQuery = 'T';
} else {
if ((subQuery == ' ') && (forUsed)) {
subQuery = 'T';
}
}
} else if (currentToken.Equals("actor")) {
if (mainQuery == ' ') {
mainQuery = 'A';
} else {
if ((subQuery == ' ') && (forUsed)) {
subQuery = 'A';
}
}
} else if (currentToken.Equals("for")) {
forUsed = true;
} else if ((searchString == null) &&
(subQuery != ' ') &&
(currentToken.StartsWith("<"))) {
searchString = currentToken;
searchStarted = true;
if (currentToken.EndsWith(">")) {
searchEnded = true;
}
} else if ((searchStarted) && (!searchEnded)) {
searchString = searchString + " " + currentToken;
if (currentToken.EndsWith(">")) {
searchEnded = true;
}
}
}
if (searchString != null) {
searchString = searchString.Replace("<",null).Replace(">",null);
//remove <>
}
DvdAbstractExpression abstractExpression;
switch (mainQuery) {
case 'A' : {
switch (subQuery) {
case 'T' : {
abstractExpression =
new DvdActorTitleExpression(searchString);
break;
}
default : {
abstractExpression =
new DvdActorExpression();
break;
}
}
break;
}
case 'T' : {
switch (subQuery) {
case 'A' : {
abstractExpression =
new DvdTitleActorExpression(searchString);
break;
}
default : {
abstractExpression = new DvdTitleExpression();
break;
}
}
break;
}
default : return result.ToString();
}
result.Add(
abstractExpression.interpret(dvdInterpreterContext));
return string.Join("",result.ToArray());
}