I am developing an application using Qt/KDE. While writing code for this, I need to read a QString that contains values like ( ; delimited)
<http://example.com/example.ext.torrent>; rel=describedby; type="application/x-bittorrent"; name="differentname.ext"
I need to read every attribute like rel, type and name into a different QString. The apporach I have taken so far is something like this
if (line.contains("describedby")) {
m_reltype = "describedby" ;
}
if (line.contains("duplicate")) {
m_reltype = "duplicate";
}
That is if I need to be bothered only by the presence of an attribute (and not its value) I am manually looking for the text and setting if the attribute is present. This approach however fails for attributes like "type" and name whose actual values need to be stored in a QString. Although I know this can be done by splitting the entire string at the delimiter ; and then searching for the attribute or its value, I wanted to know is there a cleaner and a more efficient way of doing it.
As I understand, the data is not always an URL.
So,
1: Split the string
2: For each substring, separate the identifier from the value:
id = str.mid(0,str.indexOf("="));
value = str.mid(str.indexOf("=")+1);
You can also use a RegExp:
regexp = "^([a-z]+)\s*=\s*(.*)$";
id = \1 of the regexp;
value = \2 of the regexp;
I need to read every attribute like rel, type and name into a different QString.
Is there a gurantee that this string will always be a URL?
I wanted to know is there a cleaner and a more efficient way of doing it.
Don't reinvent the wheel! You can use QURL::queryItems which would parse these query variables and return a map of name-value pairs.
However, make sure that your string is a well-formed URL (so that QURL does not reject it).
Related
I want sort view by a value that is string. but before that, i want convert string to int then sort by that.
main = models.Main.objects.all().order_by('fore_key__n')
In this code fore_key__n is string value like '20'
Annotations and DB functions can probably do this. Cast the string value to an int and then use it to order the queryset. I haven't ever had cause to try this, so treat the following as a suggestion:
main = models.Main.objects.annotate(
fkn_int_cast=Cast('fore_key__n', output_field=IntegerField()),
).order_by('fkn_int_cast')
It will throw a django.db.utils.DataError should the data in the field not be capable of conversion. Therefore, it's probably necessary to apply a regex filter as well
main = models.Main.objects.filter(
fore_key_n__regex='^[0-9]+$'
).annotate(
fkn_int_cast=Cast('fore_key__n', output_field=IntegerField()),
).order_by('fkn_int_cast')
There are other DB functions you might use, for example, to replace the commas in '1,234,456' with null strings so it becomes Cast'able
I am using data sources in Terraform to fetch a list of ids of my security groups as such:
data "aws_security_groups" "test" {
filter {
name = "group-name"
values = ["the-name"]
}
}
output "security_group_id" {
value = "The id is ${data.aws_security_groups.test.ids[*]}"
}
However, this is giving me the following error:
Error: Invalid template interpolation value
on main.tf line 11, in output "security_group_id":
11: value = "The id is ${data.aws_security_groups.test.ids[*]}"
|----------------
| data.aws_security_groups.test.ids is list of string with 1 element
Cannot include the given value in a string template: string required.
But if I use data.aws_security_groups.test.ids[0] instead it displays the ID.
Can someone help me to display the list of IDs?
First, I want to note that you don't necessarily need to combine this list with a string message at all if you don't want to, because Terraform will accept output values of any type:
output "security_group_ids" {
value = data.aws_security_groups.test.ids
}
If having them included as part of a bigger string is important for your underlying problem then you'll need to make a decision about how you want to present these multiple ids in your single string. There are various different ways you could do that, depending on what you intend to do with this information.
One relatively-straightforward answer would be to make the string include a JSON representation of the list using jsonencode, like this:
output "security_group_id_message" {
value = "The ids are ${jsonencode(data.aws_security_groups.test.ids)}"
}
If you want a more human-friendly presentation then you might prefer to use a multi-line string instead, in which case you can customize the output using string templates.
output "security_group_id_message" {
value = <<-EOT
The ids are:
%{ for id in data.aws_security_groups.test.ids ~}
- ${id}
%{ endfor ~}
EOT
}
Or, for an answer somewhere in between, you could use join to just concatenate the values together with a simple delimiter, like this:
output "security_group_id_message" {
value = "The ids are ${join(",", data.aws_security_groups.test.ids)}"
}
Note that I removed the [*] from your reference in all of these examples, since it isn't really doing anything here: data.aws_security_groups.test.ids is already an iterable collection, and so is compatible with all of the language features I used in the examples above.
IIRC the provider considers this ids attribute to be a set of strings rather than a list of strings, and so that [*] suffix could potentially be useful in other situations to force converting the set into a list if you need it to be typed that way, although if that is your intent then I'd suggest using one of the following instead so that it's clearer to a future reader what it does:
sort(data.aws_security_groups.test.ids) (if it being in lexical order is important to the behavior; Terraform uses lexical sorting by default anyway, but calling sort is a good prompt to a reader unfamiliar with Terraform to look up that function to see what the actual sort order is.)
tolist(data.aws_security_groups.test.ids) (functionally equivalent to sort above when it's a set of strings, but avoids the implication that the specific ordering is important, if all that matters is that it's a list regardless of the ordering)
I have been trying to search for an item which is there in a text file.
The text file is like
Eg: `
>HEADING
00345
XYZ
MethodName : fdsafk
Date: 23-4-2012
More text and some part containing instances of XYZ`
So I did a dictionary search for XYZ initially and found the positions, but I want only the 1st XYZ and not the rest. There is a property of XYZ that , it will always be between the 5 digit code and the text MethondName .
I am unable to do that.
WORDLIST ZipList = 'Zipcode.txt';
DECLARE Zip;
Document
Document{-> MARKFAST(Zip, ZipList)};
DECLARE Method;
"MethodName" -> Method;
WORDLIST typelist = 'typelist.txt';
DECLARE type;
Document{-> MARKFAST(type, typelist)};
Also how do we use REGEX in UIMA RUTA?
There are many ways to specify this. Here are some examples (not tested):
// just remove the other annotations (assuming type is the one you want)
type{-> UNMARK(type)} ANY{-STARTSWITH(Method)};
// only keep the first one: remove any annotation if there is one somewhere in front of it
// you can also specify this with POSISTION or CURRENTCOUNT, but both are slow
type # #type{-> UNMARK(type)}
// just create a new annotation in between
NUM{REGEXP(".....")} #{-> type} #Method;
There are two options to use regex in UIMA Ruta:
(find) simple regex rules like "[A-Za-z]+" -> Type;
(matches) REGEXP conditions for validating the match of a rule element like
ANY{REGEXP("[A-Za-z]+")-> Type};
Let me know if something is not clear. I will extend the description then.
DISCLAIMER: I am a developer of UIMA Ruta
It looks like a simple task, but how would you solve it? I don't get any solution right now.
ls_message-text = 'Pernr. 12345678 (Pete Peterson) is valid (06/2015).
append ls_message to lt_message.
ls_message-text = 'Pernr. 12345678 (Pete Peterson) is valid (07/2015).
append ls_message to lt_message.
This is the code I got, the thing is, this is the message I am showing in my application. The customer says that the 2 messages are the same. The second should be deleted.
How would you compare it to delete the line? The table might contain more then 2 lines and also with another text like "is not valid".
I can't extend the structure to have more fields for comparison, I can only use the string comparison on this one field. Are there string comparisons possible with a regex or something?
Maybe you could solve your requirement using the Levenshtein distance . ABAP has a built-in function "distance" that gives you the number of operations to convert one string into another. Ex:
DATA msg1 type string.
DATA msg2 type string.
msg1 = 'Levehnstein Distance 7/2015'.
msg2 = 'Levehnstein Distance 6/2015'.
data l_distance type i.
l_distance = distance( val1 = msg1 val2 = msg2 ).
if l_distance lt 2 .
"It's almost the same text
endif.
In this case l_distance will be 1, because only one operation is necessary (replacing).
Hope this helps,
Assuming you want to retain only one message for each unique Pernr. in lt_message, you can use regex to filter for the Pernr. and use that as "key". Now you can delete all but the first message of lt_message that matches this key.
Expand your regex if you want to keep only certain messages, e.g. only the "is valid" ones.
have you tried looking to program DEMO_REGEX_TOY.
Gives an idea on how to work with Regular expresion, that probably will save the problem
I have an application loading CAD data (Custom format), either from the local filesystem specifing an absolute path to a drawing or from a database.
Database access is realized through a library function taking the drawings identifier as a parameter.
the identifiers have a format like ABC 01234T56-T, while my paths a typical windows Paths (eg x:\Data\cadfiles\cadfile001.bin).
I would like to write a wrapper function Taking a String as an argument which can be either a path or an identifier which calls the appropriate functions to load my data.
Like this:
Function CadLoader(nameOrPath : String):TCadData;
My Question: How can I elegantly decide wether my string is an idnetifier or a Path to a file?
Use A regexp? Or just search for '\' and ':', which are not appearing in the Identifiers?
Try this one
Function CadLoader(nameOrPath : String):TCadData;
begin
if FileExists(nameOrPath) then
<Load from file>
else
<Load from database>
end;
I would do something like this:
function CadLoader(nameOrPath : String) : TCadData;
begin
if ((Pos('\\',NameOrPath) = 1) {UNC} or (Pos(':\',NameOrPath) = 2) { Path })
and FileExists(NameOrPath) then
begin
// Load from File
end
else
begin
// Load From Name
end;
end;
The RegEx To do the same thing would be: \\\\|.:\\ I think the first one is more readable.
In my opinion, the K.I.S.S. principle applies (or Keep It Simple Stupid!). Sounds harsh, but if you're absolutely certain that the combination :\ will never be in your identifiers, I'd just look for it on the 2nd position of the string. Keeps things understandable and readable. Also, one more quote:
Some people, when confronted with a
problem, think "I know, I'll use
regular expressions." Now they have
two problems. - Jamie Zawinski
You should pass in an additional parameter that says exactly what the identifier actually represents, ie:
type
CadLoadType = (CadFromPath, CadFromDatabase);
Function CadLoader(aType: CadLoadType; const aIdentifier: String): TCadData;
begin
case aType of
CadFromPath: begin
// aIdentifier is a file path...
end;
CadFromDatabase: begin
// aIdentifier is a database ID ...
end;
end;
end;
Then you can do this:
Cad := CadLoader(CadFromFile, 'x:\Data\cadfiles\cadfile001.bin');
Cad := CadLoader(CadFromDatabase, 'ABC 01234T56-T');