The time of day that you have missed. Recently I began to study the expressive expressions, but the task before me is too complicated.
I think many people need the ability to quickly format texts of almost any type. Problem is not easy and I hope to get a solution to this problem from professionals.
If you use a limited breakdown for each line, then only large lines are broken which is much better. That is, to break only those lines that are larger than a certain size and which are more or less evenly broken Correct formatting of the text is quite Difficult to take into account a lot, I will go out for a long time. As you can see, there are small lines and they have to be sent back by connecting the previous line, but the problem is. And again have to apply formatting. But it is unclear whether this new formatting will create new problems.
All this is write in the macro via notepad ++ one after another and use.
However, it is necessary to solve the most important problems:
It is important to
I want to immediately note: textFX does not offer. My attempts to write a macro with textFX (including attempts with 75 or a number from the clipboard failed, the text was written with unreadable code), I sent a corresponding message to the site notepad ++ a day ago
Use a regular point also do not offer. The fact is that notepad ++ macro does not understand the point of replacing the indentation with spaces by default 4pcs. (Yes, the macro must also indent the text, but this is all right)
About soft wordwrap (not formatted just click) is also not worth talking about.
inscrease line indent 2-4
split lines
descrease line indet 2-4
^(.?)$\s+?^(?=.^\1$) null
2017 (\d+:\d+) 17
subscribe .+$ null
(^.{1,30}$)\R \1
\r\r\n \n
^ spaces\1
i create macro and solved more problems
Related
For an school project, I need to parse a text/source file containing a simplified "fake" programming language to build an AST. I've looked at boost::spirit, however since this is a group project and most seems reluctant to learn extra libraries, plus the lecturer/TA recommended leaning to create a simple one on C++. I thought of going that route. Is there some examples out there or ideas on how to start? I have a few attempts but not really successful yet ...
parsing line by line
Test each line with a bunch of regex (1 for procedure/function declaration), one for assignment, one for while etc...
But I will need to assume there are no multiple statements in one line: eg. a=b;x=1;
When I reach a container statement, procedures, whiles etc, I will increase the indent. So all nested statements will go under this
When I reach a } I will decrement indent
Any better ideas or suggestions? Example code I need to parse (very simplified here ...)
procedure Hello {
a = 1;
while a {
b = a + 1 + z;
}
}
Another idea was to read whole file into a string, and go top down. Match all procedures, then capture everything in { ... } then start matching statements (end with ;) or containers while { ... }. This is similar to how PEG does things? But I will need to read entire file
Multipass makes things easier. On a first pass, split things into tokens, like "=", or "abababa", or a quote-delimited string, or a block of whitespace. Don't be destructive (keep the original data), but break things down to simple chunks, and maybe have a little struct or enum that describes what the token is (ie, whitespace, a string literal, an identifier type thing, etc).
So your sample code gets turned into:
identifier(procedure) whitespace( ) identifier(Hello) whitespace( ) operation({) whitespace(\n\t) identifier(a) whitespace( ) operation(=) whitespace( ) number(1) operation(;) whitespace(\n\t) etc.
In those tokens, you might also want to store line number and offset on the line (this will help with error message generation later).
A quick test would be to turn this back into the original text. Another quick test might be to dump out pretty-printed version in html or something (where you color whitespace to have a pink background, identifiers as light blue, operations as light green, numbers as light orange), and see if your tokenizer is making sense.
Now, your language may be whitespace insensitive. So discard the whitespace if that is the case! (C++ isn't, because you need newlines to learn when // comments end)
(Note: a professional language parser will be as close to one-pass as possible, because it is faster. But you are a student, and your goal should be to get it to work.)
So now you have a stream of such tokens. There are a bunch of approaches at this point. You could pull out some serious parsing chops and build a CFG to parse them. (Do you know what a CFG is? LR(1)? LL(1)?)
An easier method might be to do it a bit more ad-hoc. Look for operator({) and find the matching operator(}) by counting up and down. Look for language keywords (like procedure), which then expects a name (the next token), then a block (a {). An ad-hoc parser for a really simple language may work fine.
I've done exactly this for a ridiculously simple language, where the parser consisted of a really simple PDA. It might work for you guys. Or it might not.
Since you mentioned PEG i'll like to throw in my open source project : https://github.com/leblancmeneses/NPEG/tree/master/Languages/npeg_c++
Here is a visual tool that can export C++ version: http://www.robusthaven.com/blog/parsing-expression-grammar/npeg-language-workbench
Documentation for rule grammar: http://www.robusthaven.com/blog/parsing-expression-grammar/npeg-dsl-documentation
If i was writing my own language I would probably look at the terminals/non-terminals found in System.Linq.Expressions as these would be a great start for your grammar rules.
http://msdn.microsoft.com/en-us/library/system.linq.expressions.aspx
System.Linq.Expressions.Expression
System.Linq.Expressions.BinaryExpression
System.Linq.Expressions.BlockExpression
System.Linq.Expressions.ConditionalExpression
System.Linq.Expressions.ConstantExpression
System.Linq.Expressions.DebugInfoExpression
System.Linq.Expressions.DefaultExpression
System.Linq.Expressions.DynamicExpression
System.Linq.Expressions.GotoExpression
System.Linq.Expressions.IndexExpression
System.Linq.Expressions.InvocationExpression
System.Linq.Expressions.LabelExpression
System.Linq.Expressions.LambdaExpression
System.Linq.Expressions.ListInitExpression
System.Linq.Expressions.LoopExpression
System.Linq.Expressions.MemberExpression
System.Linq.Expressions.MemberInitExpression
System.Linq.Expressions.MethodCallExpression
System.Linq.Expressions.NewArrayExpression
System.Linq.Expressions.NewExpression
System.Linq.Expressions.ParameterExpression
System.Linq.Expressions.RuntimeVariablesExpression
System.Linq.Expressions.SwitchExpression
System.Linq.Expressions.TryExpression
System.Linq.Expressions.TypeBinaryExpression
System.Linq.Expressions.UnaryExpression
I posted a question similar to this earlier, however, after thinking about it and testing the answers, I believe I misinterpreted the answers and the answerer(s) misinterpreted me. The original question is here. I think people believed that I just wanted to highlight strings, I didn't state my exact purpose. So, I will now:
What I've been trying to do lately is create a 100% from scratch text box in C++ CLR using GDI+. I've gotten to the challange of placing the caret when the user clicks in the textbox. Doing simple math (Where they clicked divided by line width) I can figure out which line they clicked. But in order to get the character clicked, I need (unless there are better ways) to compare the bounding rectangles of all the characters in the line and place the caret before the one the mouse fits into. In order to do this, I need to get the exact bounds of each individual character, not an entire string.
I've already tried a few things, none of which seemed to work:
Graphics::MeasureString is not recommended by anyone, nor does
it give what I want
TextRenderer::MeasureText is more accurate, but for this not accurate enough
Graphics::MeasureCharacterRanges has a 32 character
cap, and I'm expecting lines to be over 32 characters long in some
cases
I believe I can't use these methods, unless there are ways around their limitations. I hope I made my problem and expected solution a lot more clear than I previously did.
Because of the way text is kerned and anti-aliased, the boundary of a character depends on all of the characters to the left of it. However you don't need to know every character boundary, only the ones on either side of your click point. You can find those with a binary search - split your string in half, measure that (using TextRenderer::MeasureText), and determine if it's to the left or right of your click point. Keep narrowing down the size of the string until there's only one possibility remaining.
There's a completion type that isn't listed in the vim help files (notably: insert.txt), but which I instinctively feel the need for rather often. Let's say I have the words "Awesome" and "SuperCrazyAwesome" in my file. I find an instance of Awesome that should really be SuperCrazyAwesome, so I hop to the beginning of the word, enter insert mode, and then must type "SuperCrazy".
I feel I should be able to type "S", creating "SCrazy", and then simply hit a completion hotkey or two to have it find what's to the left of the cursor ("S"), what's to the right ("Crazy"), regex this against all words in the file ("/S\w*Crazy/"), and provide me with a completion popup menu of choices, or just do the replace if there's only one match.
I'd like to use the actual completion system for this. There exists a "user defined" completion which uses a function, and has a good example in the helps for replacing from a given list. However, I can't seem to track down many particulars that I'd need to make this happen, including:
How do I get a list of all words in the file from a vim function?
Can I list words from all buffers (with filenames), as vim's complete does?
How do I, in insert mode, get the text in the word before/after the cursor?
Can completion replace the entire word, and not just up to the cursor?
I've been at this for a couple of hours now. I keep hitting dead ends, like this one, which introduced me to \%# for matching with the cursor position, which doesn't seem to work for me. For instance, a search for \w*\%# returns only the first character of the word I'm on, regardless of where I'm in it. The \%# doesn't seem to anchor.
Although its not exactly following your desired method in the past I've written https://github.com/mjbrownie/swapit which might perform your task if you are looking for related keywords. It would fall down in this scenario if you have hundreds of matches.
It's mainly useful for 2-10 possible sequenced matches.
You would define a list
:SwapList awesomes Awesome MoreAwesome SuperCrazyAwesome FullyCompletelyAwesome UnbelievablyAwesome
and move through the matches with the incrementor decrementor keys (c+a) (c+x)
There are also a few other cycling type plugins like swap words that I know of on vim.org and github.
The advantage here is you don't have to group words together with regex.
I wrote something like that years ago when working with 3rd party libraries with rather long CamelCasePrefixes in every function different for each component. But it was in Before Git Hub era and I considered it a lost jewel, but search engine says I am not a complete ass and posted it to Vim wiki.
Here it is: http://vim.wikia.com/wiki/Custom_keyword_completion
Just do not ask me what 'MKw' means. No idea.
This will need some adaptation to your needs, as it is looking up only the word up to the cursor, but the idea is there. It works for current buffer only. Iterating through all buffers would be sluggish as it is not creating any index. For those purposes I would go with external grep.
I have a peculiar problem. I have an email group that pipes emails to a message board. The word wrap of the emails varies. In yahoo, the messages tend to fill the entire container on the message board. But in all other mail clients, only part of the container width is filled, because the original mail was wrapped. I want all of the email messages to fill the entire width of the container. I've thought of two possible solutions: CSS, or a Regex that eliminates line breaks. Because I am only a garage mechanic (at these sorts of things), I simply cannot get the job done. Any help out there?
Here is a link that shows the issue: http://seanwilson.org/forum/index.php?t=msg&th=1729&start=0&S=171399e41f2c10c4357dd9b217caaa3f
(compare the message of "sean" with that of "rob." One fills the container, the other not).
Can any of you suggest how to get all the mail to fill the container?
You gave too little information - what programming language are you using - PHP/Javascript/anything different?
I think you only need to replace \n, \r and \r\n with whitespace. PHP code for that:
$nowrap = str_replace('\r\n', ' ', $nowrap);
$nowrap = str_replace('\r', ' ', $nowrap);
$nowrap = str_replace('\n', ' ', $nowrap);
You can do that analogically in other languages (for JS see string.replace method: http://www.tizag.com/javascriptT/javascript-string-replace.php).
Depending on the situation (people always seem to add 2 linebreaks between paragraphs), you could say the problem is: replace all newlines not directly preceded or followed by a newline with a space.
//just to be sure, remove \r's
$string = str_replace("\r",'',$string);
$string = preg_replace('/(?<!\n)\n(?!\n)/',' ',$string);
While allowing \r's:
$string = preg_replace('/(?<!\r|\n)\r?\n(?!\r|\n)/',' ',$string);
Edit: nevermind: do not use: while people tend to write their email text in paragraphs, you will break their signature / signoff with this regex. One could fiddle around with a minimum linelength before deeming it 'breakable' (i chose 63), but fiddly it will be:
$string = preg_replace('/([^\r\n]{63,})\r?\n(?!\r|\n)/','$1 ',$string);
The problem is: there are no assurance the linebreak wasn't intended. With a fiddleable line-length you could base it on average users, but the question is: what do they mind more: the differences between breaking & non-breaking paragraphs, or the breaking of their signatures?
Thanks for getting back so quickly!
The discussion board uses php (and also CSS). The only trouble is that I am somewhat limited in my ability to tinker with its programing. If I am to do this at my current level of skilty, I have only one of two options.
using a preg-replace in php. The discussion board allows us to do this from a control panel. So If I could do it with one preg-replace statement, it should work.
Would Wrikken's solution work if I do not remove \r's? Because that seems to be spot on. (could the \r's be added to the preg-replace?)
I had hoped the solution could come through a css property of some sort. I guess that isn't possible.
Thanks so much for your help!
[NOTE: thanks so much for your help! The solution worked!!! I changed the number to 53 or so. It needed to be a little smaller. I don't care that a rare, long signature lines may lose its carriage return. That's a small price to pay for a full message box! You easily saved me several days of learning something that was bound to be moderately frustrating, Thanks so much for that quick fix. I am joyous at the help I received here.]
I recently discussed editors with a co-worker. He uses one of the less popular editors and I use another (I won't say which ones since it's not relevant and I want to avoid an editor flame war). I was saying that I didn't like his editor as much because it doesn't let you do find/replace with regular expressions.
He said he's never wanted to do that, which was surprising since it's something I find myself doing all the time. However, off the top of my head I wasn't able to come up with more than one or two examples. Can anyone here offer some examples of times when they've found regex find/replace useful in their editor? Here's what I've been able to come up with since then as examples of things that I've actually had to do:
Strip the beginning of a line off of every line in a file that looks like:
Line 25634 :
Line 632157 :
Taking a few dozen files with a standard header which is slightly different for each file and stripping the first 19 lines from all of them all at once.
Piping the result of a MySQL select statement into a text file, then removing all of the formatting junk and reformatting it as a Python dictionary for use in a simple script.
In a CSV file with no escaped commas, replace the first character of the 8th column of each row with a capital A.
Given a bunch of GDB stack traces with lines like
#3 0x080a6d61 in _mvl_set_req_done (req=0x82624a4, result=27158) at ../../mvl/src/mvl_serv.c:850
strip out everything from each line except the function names.
Does anyone else have any real-life examples? The next time this comes up, I'd like to be more prepared to list good examples of why this feature is useful.
Just last week, I used regex find/replace to convert a CSV file to an XML file.
Simple enough to do really, just chop up each field (luckily it didn't have any escaped commas) and push it back out with the appropriate tags in place of the commas.
Regex make it easy to replace whole words using word boundaries.
(\b\w+\b)
So you can replace unwanted words in your file without disturbing words like Scunthorpe
Yesterday I took a create table statement I made for an Oracle table and converted the fields to setString() method calls using JDBC and PreparedStatements. The table's field names were mapped to my class properties, so regex search and replace was the perfect fit.
Create Table text:
...
field_1 VARCHAR2(100) NULL,
field_2 VARCHAR2(10) NULL,
field_3 NUMBER(8) NULL,
field_4 VARCHAR2(100) NULL,
....
My Regex Search:
/([a-z_])+ .*?,?/
My Replacement:
pstmt.setString(1, \1);
The result:
...
pstmt.setString(1, field_1);
pstmt.setString(1, field_2);
pstmt.setString(1, field_3);
pstmt.setString(1, field_4);
....
I then went through and manually set the position int for each call and changed the method to setInt() (and others) where necessary, but that worked handy for me. I actually used it three or four times for similar field to method call conversions.
I like to use regexps to reformat lists of items like this:
int item1
double item2
to
public void item1(int item1){
}
public void item2(double item2){
}
This can be a big time saver.
I use it all the time when someone sends me a list of patient visit numbers in a column (say 100-200) and I need them in a '0000000444','000000004445' format. works wonders for me!
I also use it to pull out email addresses in an email. I send out group emails often and all the bounced returns come back in one email. So, I regex to pull them all out and then drop them into a string var to remove from the database.
I even wrote a little dialog prog to apply regex to my clipboard. It grabs the contents applies the regex and then loads it back into the clipboard.
One thing I use it for in web development all the time is stripping some text of its HTML tags. This might need to be done to sanitize user input for security, or for displaying a preview of a news article. For example, if you have an article with lots of HTML tags for formatting, you can't just do LEFT(article_text,100) + '...' (plus a "read more" link) and render that on a page at the risk of breaking the page by splitting apart an HTML tag.
Also, I've had to strip img tags in database records that link to images that no longer exist. And let's not forget web form validation. If you want to make a user has entered a correct email address (syntactically speaking) into a web form this is about the only way of checking it thoroughly.
I've just pasted a long character sequence into a string literal, and now I want to break it up into a concatenation of shorter string literals so it doesn't wrap. I also want it to be readable, so I want to break only after spaces. I select the whole string (minus the quotation marks) and do an in-selection-only replace-all with this regex:
/.{20,60} /
...and this replacement:
/$0"ΒΆ + "/
...where the pilcrow is an actual newline, and the number of spaces varies from one incident to the next. Result:
String s = "I recently discussed editors with a co-worker. He uses one "
+ "of the less popular editors and I use another (I won't say "
+ "which ones since it's not relevant and I want to avoid an "
+ "editor flame war). I was saying that I didn't like his "
+ "editor as much because it doesn't let you do find/replace "
+ "with regular expressions.";
The first thing I do with any editor is try to figure out it's Regex oddities. I use it all the time. Nothing really crazy, but it's handy when you've got to copy/paste stuff between different types of text - SQL <-> PHP is the one I do most often - and you don't want to fart around making the same change 500 times.
Regex is very handy any time I am trying to replace a value that spans multiple lines. Or when I want to replace a value with something that contains a line break.
I also like that you can match things in a regular expression and not replace the full match using the $# syntax to output the portion of the match you want to maintain.
I agree with you on points 3, 4, and 5 but not necessarily points 1 and 2.
In some cases 1 and 2 are easier to achieve using a anonymous keyboard macro.
By this I mean doing the following:
Position the cursor on the first line
Start a keyboard macro recording
Modify the first line
Position the cursor on the next line
Stop record.
Now all that is needed to modify the next line is to repeat the macro.
I could live with out support for regex but could not live without anonymous keyboard macros.