Difference between revisions of "ReNamer:Pascal Script:Break script execution"
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Below is a simple demo of how to use '''Exit''' command. If <Condition> is met, the script will break its execution, otherwise, script will continue execution. | Below is a simple demo of how to use '''Exit''' command. If <Condition> is met, the script will break its execution, otherwise, script will continue execution. | ||
| − | < | + | <syntaxhighlight lang="pascal"> |
begin | begin | ||
// do some processing ... | // do some processing ... | ||
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And here is a simple demo for using '''Break''' command, which will break the loop when <Condition> is met and will continue executing everything after the loop. | And here is a simple demo for using '''Break''' command, which will break the loop when <Condition> is met and will continue executing everything after the loop. | ||
| − | < | + | <syntaxhighlight lang="pascal"> |
var | var | ||
I: Integer; | I: Integer; | ||
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As we have learned the '''Exit''' command breaks the current pass of the script, but it doesn't stop the script from being executed for the next file in the files table and so on. We encounter here a similar problem as with [[ReNamer:Pascal Script:Initialization of variables|initialization of variables]]. Solution is also similar. We will use a variable to keep track if the main code of the script should be executed or not. | As we have learned the '''Exit''' command breaks the current pass of the script, but it doesn't stop the script from being executed for the next file in the files table and so on. We encounter here a similar problem as with [[ReNamer:Pascal Script:Initialization of variables|initialization of variables]]. Solution is also similar. We will use a variable to keep track if the main code of the script should be executed or not. | ||
| − | < | + | <syntaxhighlight lang="pascal"> |
var | var | ||
TimeToExit: Boolean; | TimeToExit: Boolean; | ||
Revision as of 15:00, 8 February 2017
There are several ways to break the execution of a script. Using the Exit command breaks the current pass of the script, while using the Break command breaks the execution of a loop. One can also design the script in such a way that will not require usage of either of these commands, by correctly structuring the script with If..Then..Else statements and looping mechanisms. But sometimes you come across cases when it is easier to simply break the execution with one command, instead of redesigning the whole script.
Exit command
Below is a simple demo of how to use Exit command. If <Condition> is met, the script will break its execution, otherwise, script will continue execution.
<syntaxhighlight lang="pascal"> begin
// do some processing ... if <Condition> then Exit; // do more processing ...
end. </source>
Break command
And here is a simple demo for using Break command, which will break the loop when <Condition> is met and will continue executing everything after the loop.
<syntaxhighlight lang="pascal"> var
I: Integer;
begin
for I := 1 to 10 do begin // do some processing ... if <Condition> then Break; end; // do more processing ...
end. </source>
Stop execution for next files
As we have learned the Exit command breaks the current pass of the script, but it doesn't stop the script from being executed for the next file in the files table and so on. We encounter here a similar problem as with initialization of variables. Solution is also similar. We will use a variable to keep track if the main code of the script should be executed or not.
<syntaxhighlight lang="pascal"> var
TimeToExit: Boolean;
begin
if not TimeToExit then
begin
// that's the block for the main script code
if DialogYesNo('Would you like to stop script execution?') then
TimeToExit := True;
end;
end. </source>
So the script is still executed for every file, but it's main code is executed only until TimeToExit becomes TRUE. After that script keeps starting just to see that it has nothing to do.