I would like to remove the space after decltype( in the following SFINAE test:
template<typename C> static one test(typename std::remove_reference<decltype( &C::fromString)>::type);
Obviously, I don't want to lose spaces before ampersands in other cases like std::string &s or whatever.
Can anyone tell me which option governs this space?
Related
I'm trying to replace newline etc kind of values using regexp_replace. But when I open the result in query result window, I can still see the new lines in the text. Even when I copy the result, I can see new line characters. See output for example, I just copied from the result.
Below is my query
select regexp_replace('abc123
/n
CHAR(10)
头疼,'||CHR(10)||'allo','[^[:alpha:][:digit:][ \t]]','') from dual;
/ I just kept for testing characters.
Output:
abc123
/n
CHAR(10)
头疼,
allo
How to remove the new lines from the text?
Expected output:
abc123 /nCHAR(10)头疼,allo
There are two mistakes in your code. One of them causes the issue you noticed.
First, in a bracket expression, in Oracle regular expressions (which follow the POSIX standard), there are no escape sequences. You probably meant \t as escape sequence for tab - within the bracket expression. (Note also that in Oracle regular expressions, there are no escape sequences like \t and \n anyway. If you must preserve tabs, it can be done, but not like that.)
Second, regardless of this, you include two character classes, [:alpha:] and [:digit:], and also [ \t] in the (negated) bracket expression. The last one is not a character class, so the [ as well as the space, the backslash and the letter t are interpreted as literal characters - they stand in for themselves. The closing bracket, on the other hand, has special meaning. The first of your two closing brackets is interpreted as the end of the bracket expression; and the second closing bracket is interpreted as being an additional, literal character that must be matched! Since there is no such literal closing bracket anywhere in the string, nothing is replaced.
To fix both mistakes, replace [ \t] with the [:blank:] character class, which consists exactly of space and tab. (And, note that [:alpha:][:digit:] can be written more compactly as [:alnum:].)
I am working on macOS, not iOS, XCode 11.
My app allows in a specific location to enter text. This text can be anything. Once done it exports a csv which will be passed to an external process i cannot influence.
The issue: the external process uses semicolon ";" as a separator (csv is separated differently). If the user writes semicolon the external process will fail.
If I manually add an escaping backslash before each semicolon to the csv and then pass it to the external app it works.
What I need: having each semicolon escaped with ONE backslash in the final csv
What I tried
Escaping the whole text with quotation marks - fail
Escaping semicolons in objective-c before writing csv by trying
stringByReplacingOccurrencesOfString (look for #";" replace with #"\;" - compiler throws a warning that escape character is unknown - fail
Appreciate any help
UPDATE:
I also tried to set a double backslash like #Corbell mentioned but this leads in a double backslash in the exported CSV -> fail
I also tried to set a single backslash by using its unicode character:
[NSString stringWithFormat:#"%C;",0x5C]; --> "\\;"
Also failed and produces two backslashes in the final CSV (where i need ONE only).
In your stringByReplacingOccurencesOfString call, second parameter, try escaping your backslash with a backslash to make it a literal character to insert, i.e. #"\\;" - otherwise the compiler thinks you're trying to specify #"\;" as an escape sequence (backslash-semicolon) which is invalid.
Solved. It was the CSV Parser that added additional escaping characters. Once solved that it worked like a charm.
I'm using this library to convert a block to a CSV. However, when it encounters a string with a comma in it it molds that string. Normally not a problem except that the curly-braces seem to confuse Excel.
So, {This, is a test} gets turned into | {this | is a test} | (each side of the comma is put into separate cells).
At first I thought I needed to escape the comma but it turns out what I need to do is turn the curly braces into quotes. Is there a quick or REBOL-recommended way to do this?
The purpose of 'MOLD in %csv.r is to wrap values containing commas into double quotes.
But unfortunately 'MOLD puts strings longer than 50 characters into curly braces instead of double quotes, for better readability.
I don't know how to affect this behaviour, so I would just replace 'MOLD in Item: mold Item and Heading: mold Heading with 'DBL-QUOTE, which would simply be defined as
dbl-quote: func[s][rejoin [{"} s {"}]]
Use csv-tools.r instead. It has that functionality built in, and is verified to be Excel compatible. It will work with Rebol 2 and 3, and has been in production use for years.
I am using CMake to build my project and I have the following line:
include_directories(${LLVM_INCLUDE_DIRS})
which, after evaluating LLVM_INCLUDE_DIRS, evaluates to:
include_directories(C:\Program Files\LLVM\include)
The problem is that this is being considered two include directories, "C:\Program" and "Files\LLVM\include".
Any idea how can I solve this problem? I tried using quotation marks, but it didn't work.
EDIT: It turned out that the problem is in the file llvm-3.0\share\llvm\cmake\LLVMConfig.cmake. I enclosed the following paths with quotation marks and the problem was solved:
set(LLVM_INSTALL_PREFIX C:/Program Files/LLVM)
set(LLVM_INCLUDE_DIRS ${LLVM_INSTALL_PREFIX}/include)
set(LLVM_LIBRARY_DIRS ${LLVM_INSTALL_PREFIX}/lib)
In CMake,
whitespace is a list separator (like ;),
evaluating variable names basically replaces the variable name with its content and
\ is an escape character (to get the symbol, it needs to be escaped as well)
So, in your example, include_directories(C:\\Pogram Files\\LLVM\\include) is the same as
include_directories( C:\\Program;Files\\LLVM\\include)
that is, a list with two items. To avoid this, either
escape the whitespace as well:
include_directories( C:\\Program\ Files\\LLVM\\include) or
surround the path with quotation marks:
include_directories( "C:\\Program Files\\LLVM\\include")
Obviously, the second option is the better choice as it is
simpler and easier to read and
can be used with variable evaluation like in your example (since the result of the evaluation is then surrounded by quotation marks and thus, treated a single item)
include_directories("${LLVM_INCLUDE_DIRS}")
This works as well, if LLVM_INCLUDE_DIRS is a list of multiple directories because the items in this list will then be explicitly separated by ; so that there is no need for unquoted whitespace as implicit list item separator.
Side note:
When using hard-coded path-names (for whatever reason) in my CMake files, I usually uses forward slashes as directory separators as this works on Windows as well and avoids the need to escape all backslashes.
This is more likely to be an error at the point where LLVM_INCLUDE_DIRS is set rather than a problem with include_directories.
To check this, try calling include_directories("C:\\Program Files\\LLVM\\include") - it should work correctly.
The problem seems to be that LLVM_INCLUDE_DIRS was constructed without using quotation marks. Try for example running this:
set(LLVM_INCLUDE_DIRS C:\\Program Files\\LLVM\\include)
message("${LLVM_INCLUDE_DIRS}")
set(LLVM_INCLUDE_DIRS "C:\\Program Files\\LLVM\\include")
message("${LLVM_INCLUDE_DIRS}")
The output is:
C:\Program;Files\LLVM\include
C:\Program Files\LLVM\include
Note the semi-colon in the first output line. This is a list with 2 items.
So the way to fix this is to modify the way in which LLVM_INCLUDE_DIRS is created.
I have a string that is quite long and complicated, with special characters inside. I want to define this string as a variable, but don't want to escape each of them (because there are so many). I remember that in XML they have a special syntax for that, is there something similar for Objective-C?
Edit: I know I can save the thing in a file and load it easily, but is it possible to do so without a new file? I'm having quite some of them...
No, you have to escape the characters (though you only have to escape ", \, and control characters... is the string mostly control characters and quotes?)
A better idea might be to put the string in a file. Load it using +[NSString stringWithContentsOfFile:encoding:error:].