Suppose I have a string like this: Conditions for Paris, FR at 10:29 pm CET.
I'm wanting to grab the time: 10:29.
I know how to scan a string into another string up to a certain point, like this:
NSString *something;
NSScanner *scanner = [NSScanner scannerWithString:#"Sometest_something"];
[scanner scanUpToString:#"_" intoString:&something];
And the result will be Sometest.
However, this doesn't seem to help me get the time string I'm looking for. Any ideas? I'm sure it's quite simple.
Update: I also need to have am/pm as a separate string. For getting the time, Caleb's answer works perfectly. But I still haven't figured out how to get am/pm. Any ideas?
Yep, here we go, figured it out. :)
NSScanner *scanner = [NSScanner scannerWithString:timestring];
NSString *ampm;
[scanner scanUpToCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet] intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet letterCharacterSet] intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet uppercaseLetterCharacterSet] intoString:&m];
It's not clear from your question, but I'm guessing that the "Paris, FR" part of the string might change but the rest of the string (obviously not including the time) is constant? If so, you could:
[scanner scanUpToString:#" at " intoString:nil];
[scanner scanString:#" at " intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet letterCharacterSet] intoString:&something];
Edit: Come to think of it, if you know that there are no digits before the time, you could just use -scanUpToCharactersFromSet: for the whole thing:
[scanner scanUpToCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet] intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet letterCharacterSet] intoString:&something];
Related
I found some good code for parsing .srt files on stackoverflow (Parsing SRT file with Objective C) shown below:
NSScanner *scanner = [NSScanner scannerWithString:[theTextView string]];
while (![scanner isAtEnd])
{
#autoreleasepool
{
NSString *indexString;
(void) [scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&indexString];
NSString *startString;
(void) [scanner scanUpToString:#" --> " intoString:&startString];
(void) [scanner scanString:#"-->" intoString:NULL];
NSString *endString;
(void) [scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&endString];
NSString *textString;
(void) [scanner scanUpToString:#"\r\n\r\n" intoString:&textString];
textString = [textString stringByReplacingOccurrencesOfString:#"\r\n" withString:#" "];
textString = [textString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
indexString, #"index",
startString, #"start",
endString , #"end",
textString , #"text",
nil];
NSLog(#"%#", dictionary);
}
}
I have a number of .srt files from a TV series that contain a lot of ‘credit’ subs which kinda spoil the experience and coded them out, leaving me with non-sequential indexes like this:
// deleted subtitles
3
00:00:11,070 --> 00:00:14,466
Screenwriter: Name here...
4
00:00:14,633 --> 00:00:17,466
Music: Name here...
5
00:00:17,686 --> 00:00:20,680
Narrator: Name here...
// deleted subtitle
7
00:01:17,966 --> 00:01:21,966
Episode 12
which chokes FCPX when I try to import the file. I’m completely new to NSScanner and tried everything I can think of without success. I'd appreciate any help in modifying the above just to skip the sub index line altogether (if possible?). I'm okay with adding them back in sequentially with separate code. Thanks!
UPDATE:
Thanks for your suggestion of indexing through the 'while' loop skaak, but the problem still seems to defy logic as it never increases beyond the very first pass (!!). The logs are shown below - firstly using an NSDictionary and then appending to an NSMutableString (probably more useful for my purposes). Note that in both cases the first sub does get changed to 1, but indices 4,5,7 remain unchanged rather than being renumbered 2,3,4.
2020-07-29 18:35:26.267 SRT Editor[12494:903]
{
end = "00:00:14,466";
index = 1;
start = "00:00:11,070";
text = "Screenwriter: Hashida Sugako\n\n4 00:00:14,633 --> 00:00:17,466 Music: Sakada Koichi\n\n5 00:00:17,686 --> 00:00:20,680 Narrator: Naraoka Tomoko\n\n7 00:01:28,633 --> 00:01:34,233 It was early spring in 1958...
}
2020-07-29 18:51:15.612 SRT Editor[12646:903]
1
00:00:11,07000:00:14,466Screenwriter: Hashida Sugako
4 00:00:14,633 --> 00:00:17,466 Music: Sakada Koichi
5 00:00:17,686 --> 00:00:20,680 Narrator: Naraoka Tomoko
7 00:01:28,633 --> 00:01:34,233 It was early spring in 1958...
Another puzzling observation is that if I put in a loopCounter++ it also suggests the 'while' loop only makes one pass through which baffles me, though I did mention being unfamiliar with NSScanner.
Try this
NSUInteger index = 1;
NSScanner *scanner = [NSScanner scannerWithString:[theTextView string]];
while (![scanner isAtEnd])
{
#autoreleasepool
{
NSString *indexString;
(void) [scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&indexString];
NSString *startString;
(void) [scanner scanUpToString:#" --> " intoString:&startString];
(void) [scanner scanString:#"-->" intoString:NULL];
NSString *endString;
(void) [scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&endString];
NSString *textString;
(void) [scanner scanUpToString:#"\r\n\r\n" intoString:&textString];
textString = [textString stringByReplacingOccurrencesOfString:#"\r\n" withString:#" "];
textString = [textString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
// Use my own incremental index
#( index ), #"index",
startString, #"start",
endString , #"end",
textString , #"text",
nil];
NSLog(#"%#", dictionary);
// Move to next index
index ++;
}
}
I am helpless. I parse this text...
<parse>HELLO</parse>
<parse>World</parse>
<parse>digit</parse>
<parse>wow</parse>
<parse>hellonewitem</parse>
<parse>lastitem</parse>
with an instance of NSScanner:
-(NSMutableArray *)parseTest
{
if (parserTest != NULL)
{
NSScanner *scanner = [[NSScanner alloc] initWithString:parserTest];
NSString *test;
NSMutableArray *someArray = [NSMutableArray array];
while ([scanner isAtEnd]!=YES)
{
[scanner scanUpToString:#"<parse>" intoString:nil];
[scanner scanString:#"<parse>" intoString:nil];
[scanner scanUpToString:#"</parse>" intoString:&test];
[scanner scanString:#"</parse>" intoString:nil];
[someArray addObject:test];
NSLog(#"%#",test);
}
return someArray;
}
Can't get my head around why I am getting the last object twice here in the returned array. What am I missing? Is there something wrong with the:
[scanner isAtEnd]!=Yes?
Thanks for any help!
Matthias
check the count of the someArray,
NSLog(#"%d",[someArray count]);
if it is 6, then you are doing something wrong in printing the values.
else if it is 7, then something going wrong somewhere, and need to be sorted
Hope the first condition is true.
What would be the best way to get every substring between double quotes and make it into an array?
For example, if the string (NSString) is:
#"abcd \"efgh\" ijklm \"no\" p \"qrst\" uvwx \"y\" z"
I want the result to be:
{#"efgh", #"no", #"qrst", #"y"}
as an NSArray.
This should get you started:
NSString *str = #"abcd \"efgh\" ijklm \"no\" p \"qrst\" uvwx \"y\" z";
NSMutableArray *target = [NSMutableArray array];
NSScanner *scanner = [NSScanner scannerWithString:str];
NSString *tmp;
while ([scanner isAtEnd] == NO)
{
[scanner scanUpToString:#"\"" intoString:NULL];
[scanner scanString:#"\"" intoString:NULL];
[scanner scanUpToString:#"\"" intoString:&tmp];
if ([scanner isAtEnd] == NO)
[target addObject:tmp];
[scanner scanString:#"\"" intoString:NULL];
}
for (NSString *item in target)
{
NSLog(#"%#", item);
}
One way would be to use componentsSeparatedByString: to split them based on ". This should give you an array of words the count of which should be odd. Filter all the even numbered words into an array. This should be your desired array.
Alternatively look at NSPredicate.
I am trying to parse a .rtf file that was created by someone else, and I don't have control over the file contents or format. There are several blocks to the file and each block has a set of information that I need to get. Each block is set up like this:
[Title]
[Type] ([sub type])
Level: [CSV list of levels]
Components: [CSV list of components]
Time: [proprietary time format]
Length: [length value]
Target: [target text]
Dwell: [dwell time in proprietary time format]
Saves: [yes/no]
Additional Information: [additional information]
[notes]
There may be from 50 to 100 blocks like the one above in each file. I have used the NSRegularExpression class to do some other parsing in my app, but I can't even think about how to accomplish this.
As far as I can tell, each block is separated by a double line.
Try using a NSScanner, like this:
NSString *input =
#"[Title]\n"
#"[Type] ([sub type])\n"
#"Level: [CSV list of levels]\n"
#"Components: [CSV list of components]\n"
#"Time: [proprietary time format]\n"
#"Length: [length value]\n"
#"Target: [target text]\n"
#"Dwell: [dwell time in proprietary time format]\n"
#"Saves: [yes/no]\n"
#"Additional Information: [additional information]\n"
#"[notes]\n";
NSString *title, *type, *subType, *level, *components, *time, *length, *target, *dwell, *saves, *additional, *notes;
title = type = subType = level = components = time = length = target = dwell = saves = additional = notes = nil;
NSScanner *scanner = [NSScanner scannerWithString:input];
// read the first line into title...
[scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&title];
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
// read the first part of the second line into type
[scanner scanUpToString:#" (" intoString:&type];
[scanner scanString:#"(" intoString:nil];
// read the next part of the second line into subType
[scanner scanUpToString:#")" intoString:&subType];
// read the end of the line
[scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
// read in level
[scanner scanString:#"Level: " intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&level];
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
// read in components:
[scanner scanString:#"Components: " intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&components];
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
// read in time:
[scanner scanString:#"Time: " intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&time];
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
// read in length
[scanner scanString:#"Length: " intoString:nil];
[scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&length];
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:nil];
// complete for all other metadata
NSLog(#"%#", title);
NSLog(#"%# (%#)", type, subType);
NSLog(#"%#", level);
NSLog(#"%#", components);
NSLog(#"%#", time);
NSLog(#"%#", length);
NSLog(#"%#", target);
NSLog(#"%#", dwell);
NSLog(#"%#", saves);
NSLog(#"%#", additional);
NSLog(#"%#", notes);
This works for me, obviously complete the process for all the other fields.
For the time being, I can just convert the .rtf files to regular text files. This allows me to process them more easily.
Thanks for the help! I am going to look into using the NSScanner to do this more elegantly.
I have NSString's in the form of Johnny likes "eating" apples. I want to remove the quotations from my strings so that.
Johnny likes "eating" apples
becomes
John likes apples
I've been playing with NSScanner to do the trick but I'm getting some crashes.
- (NSString*)clean:(NSString*) _string
{
NSString *string = nil;
NSScanner *scanner = [NSScanner scannerWithString:_string];
while ([scanner isAtEnd] == NO)
{
[scanner scanUpToString:#"\"" intoString:&string];
[scanner scanUpToString:#"\"" intoString:nil];
[scanner scanUpToString:#"." intoString:&string]; // picked . becuase it's not in the string, really just want rest of string scanned
}
return string;
}
This code is hacky, but seems to produce the output you want.
It was not tested with unexpected inputs (string not in the form described, nil string...), but should get you started.
- (NSString *)stringByStrippingQuottedSubstring:(NSString *) stringToClean
{
NSString *strippedString,
*strippedString2;
NSScanner *scanner = [NSScanner scannerWithString:stringToClean];
[scanner scanUpToString:#"\"" intoString:&strippedString]; // Getting first part of the string, up to the first quote
[scanner scanUpToString:#"\" " intoString:NULL]; // Scanning without caring about the quoted part of the string, up to the second quote
strippedString2 = [[scanner string] substringFromIndex:[scanner scanLocation]]; // Getting remainder of the string
// Having to trim the second part of the string
// (Cf. doc: "If stopString is present in the receiver, then on return the scan location is set to the beginning of that string.")
strippedString2 = [strippedString2 stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#"\" "]];
return [strippedString stringByAppendingString:strippedString2];
}
I will come back (much) later to clean it, and drill into the documentation of the class NSScanner to figure what I am missing, and had to take care with a manual string trimming.