I'm looking for a function that displays a LaTeX or a MathML string in a windows GUI app.
For example given: char* myLaTeX = "\\dfrac{5}{3}";
the function I'm looking for can display the formatted fraction in my window, in the logical coordinates i set.
Is there a way to do so just using the DrawText() or TextOut()?
I'm a Smalltalk programmer so let me tell you how I've worked this out:
Use the EM_GETOLEINTERFACE message to get an IRichEditOle interface
Use this interface to QueryInterface ITextDocument2
Use GetSelection and then SetText to output '5/3' (the String)
Use Range and Select to select all (i.e., '5/3')
Use BuildUpMath with argument 0 to produce the math notation
For general expressions replace step 3 with a printing visitor on the expression's parse tree.
Note that steps 3 and 5 are not intended for TeX but for the Unicode Nearly Plain-Text Encoding of Mathematics, which is a derived format. The reason to use this format is that, at least in my experience, only fairly simple TeX expressions got correctly rendered. Of course, it would be worth giving it a try. In such case, use the TeX format (as far as I know LaTeX is not supported, so in the example \dfrac{5}{3} should be written as {5 \over 3}) and the tomTeX constant (=1) instead of 0 as the argument of BuildUpMath.
Here is a TeX example:
which I produced from the expression:
$\int_{-\infty}^\pi {x_0\over {\sqrt{y_0^{t^2} + 1}} + {5\over 3}}\; dt$
Another thing to keep in mind when using this feature is that it requires RichEdit version 6+, which comes with recent versions of Office.
Finally, after some experimentation I realized that only two modules are needed for this to work: RICHED20.dll and MSPTLS.DLL, the first one not to be confused with the dll that comes with Windows. Look for them in
%ProgramFiles%\Microsoft Office\root\VFS\ProgramFilesCommonX86\Microsoft Shared\OFFICE16
Related
I want to search for all lines that match this regex
^([0-9IVX]\.)*.*\R
and report with the page number they are at. The output would be something like:
1. Heading/page number
1.1 Subheading/page number
1.1.1. Subsubheading/page number
Is this possible to do in PDF? I suppose that would require Ghostscript, but searching the How to Use Ghostscript page for regex I find nothing.
I can't think why you would expect Ghostscript to do search for you.
I'm not sure if you are hoping to get the data type 'heading, page number' etc from the PDF file, or if you are going to work that out yourself based on the data you find.
If it's the former then the first problem is that, in general, PDF files don't have the kind of structure information you are looking for. There is nothing in most PDF files which says 'this is a heading', 'this is a page number' etc.
There are such things as 'tagged PDF' which adds non-printing elements to a PDF file which do carry that kind of data around with them. This is an entirely optional feature, the vast majority of PDF files don't contain it, and Ghostscript completely ignores it.
Since most PDF files don't have that information, you can't rely on it, unless you are in the happy position of knowing where your PDF files are being generated and that they contain this kind of information. In which case there are numerous tools around which will extract it for you, or enable you to write code to do so.
The problem with just searching for the text is that firstly the text need not be written as a contiguous stream. So if you are looking for '1.1' that might be written as:
(1.1) Tj
(1) Tj
(.) Tj
(1) Tj
[(1) -0.1 (.) 0.1 (1)] TJ
or any combination of those. The individual character codes need not even appear in order or in the same content stream.
Secondly the character code in a PDF content stream need not be (and often is not) a Unicode code point. Or ASCII, or any other standard coding scheme, it can be totally arbitrary.
Some PDF files carry a ToUnicode CMap around which maps the character codes to Unicode code points, but not all do. Some fonts may use a standard (that's PDF standard) Encoding, in which case it's possible to infer the Unicode code points. Some Encodings may contain glyph names, from which it's again possible to infer Unicode code points.
In the end though, some PDF files are simply impossible to extract text from without using OCR.
Your best bet is probably to write code to extract text, and Ghostscript will do that. It even goes through the heirarchy of fallbacks listed above to try and find a Unicode code point. If all else fails it just uses the character code and hopes that's good enough.
If you use Ghostscript's txtwrite device it will produce either a faked up text page (the default) which attempts, as far as possible, to mimic the text layout in the original PDF file, including merging bits of text that aren't contiguous in the PDF file but are next to each other on the page. Or an 'XML-like' output which will tell you which Unicode code points, or character codes, were encountered and what their position is on the original page. If you don't like txtwrite's attempts to figure out which text goes with what, then you can use this to write your own.
I suspect the text page is probably good enough for your purposes. You can have the txtwrite device produce one file per page, so you can get the page number from the filename. Then you can write your own regex expression(s) to search the files and find your matches.
Is it possible to look for numbers in a text file and do some math evaluation on them in the replace feature ? Using a built-in feature or a plugin.
For example, suppose I have following text file content :
1
2
3
4
5
And I want to increment each number, for a result like this :
2
3
4
5
6
It's possible that PackageControl contains a Sublime Text 2 package that would do something like this. Some quick searching found Evaluate and Selection Evaluator (which is deprecated) which can both replace the selection by doing something external and may be workable for your use case.
The Emmet package also has an Evaluate Math Expression functionality that may be useful, if you happen to already use Emmet in your workflow. A note on Emmet is that it's fairly intrusive and steals your Tab key, so extra configuration may be required to keep other things working as you expect.
Although you've tagged Sublime Text 2 specifically, I'd also point out that the latest development versions of Sublime Text 3 have among their list of new features something like the following, which may be what you want.
Here I use a simple regex that matches all numbers, then use the new Arithmetic command to manipulate the values using an arbitrary expression.
Something to note is that this is a feature added in the latest development series and hasn't made its way to stable yet. As such if you want to use it right now you need to have an ST3 license (only licensed users can use development versions).
I want to create a C++ console application that print some text to different parts of the console. For example in QBasic you can use:
locate(8,5)
print "hi"
And hi would be printed in column 8 line 5. In C++ when I use cout it always prints on the next line, and begins printing in the first column.
Is there any way I can do this?
C++ itself does not have this feature, it's I/O model is a fairly simple, sequential one.
If you want to do fancy cursor positioning, you'll need to output (for example) control characters which your terminal will recognise as special commands (such as ANSI or VT escape sequences), or use a library like curses (see ncurses here) which can do a lot of the grunt work for you, not just cursor positioning but also things like text mode windows and so forth.
A library, like ncurses can help you do this.
If for some reason I want to selectively convert camelCase named things to being underscore separated in vim, how could I go about doing so?
Currently I've found that I can do a search /s[a-z][A-Z] and record a macro to add an underscore and convert to lower case, but I'm curious as to if I can do it with something like :
%s/([a-z])([A-Z])/\1\u\2/gc
Thanks in advance!
EDIT: I figured out the answer for camelCase (which is what I really needed), but can someone else answer how to change CamelCase to camel_case?
You might want to try out the Abolish plugin by Tim Pope. It provides a few shortcuts to coerce from one style to another. For example, starting with:
MixedCase
Typing crc [mnemonic: CoeRce to Camelcase] would give you:
mixedCase
Typing crs [mnemonic: CoeRce to Snake_case] would give you:
mixed_case
And typing crm [mnemonic: CoeRce to MixedCase] would take you back to:
MixedCase
If you also install repeat.vim, then you can repeat the coercion commands by pressing the dot key.
This is a bit long, but seems to do the job:
:%s/\<\u\|\l\u/\= join(split(tolower(submatch(0)), '\zs'), '_')/gc
I suppose I should have just kept trying for about 5 more minutes. Well... if anyone is curious:
%s/\(\l\)\(\u\)/\1\_\l\2/gc does the trick.
Actually, I realized this works for camelCase, but not CamelCase, which could also be useful for someone.
I whipped up a plugin that does this.
https://github.com/chiedojohn/vim-case-convert
To convert the case, select a block of text in visual mode and the enter one of the following (Self explanatory) :
:CamelToHyphen
:CamelToSnake
:HyphenToCamel
:HyphenToSnake
:SnakeToCamel
:SnakeToHyphen
To convert all occerences in your document then run one of the following commands:
:CamelToHyphenAll
:CamelToSnakeAll
:HyphenToCamelAll
:HyphenToSnakeAll
:SnakeToCamelAll
:SnakeToHyphen
Add a bang (eg. :CamelToHyphen!) to any of the above command to bypass the prompts before each conversion.
You may not want to do that though as the plugin wouldn't know the different between variables or other text in your file.
For the CamelCase case:%s#(\<\u\|\l)(\l+)(\u)#\l\1\2_\l\3#gc
Tip: the regex delimiters can be altered as in my example to make it (somewhat) more legible.
I have an API for various development oriented processing. Among other things, it provides a few functions for transforming names between (configurable) conventions (variable <-> attribute <-> getter <-> setter <-> constant <-> parameter <-> ...) and styles (camelcase (low/high) <-> underscores). These conversion functions have been wrapped into a plugin.
The plugin + API can be fetch from here: https://github.com/LucHermitte/lh-dev, for this names conversion task, it requires lh-vim-lib
It can be used the following way:
put the cursor on the symbol you want to rename
type :NameConvert + the type of conversion you wish (here : underscore). NB: this command supports auto-completion.
et voilà!
Usually I use streams for formatting stuff however in this case ?I don't know the format until runtime.
I want to be able to take something like the following format string:
Hello {0}! Your last login was on {1,date:dd/mm/yy}.
...and feed in the variables "Fire Lancer" and 1247859223, and end up with the following formatted string:
Hello Fire Lancer! Your last login was on 17/07/09.
In other languages I use there is built in support for this kind of thing, eg pythons format string method, however in c++ there doesn't seem to be any such functionality, accept the C print methods which are not very safe.
Also this is for a high performance program, so whatever solution I use needs to parse the format string once and store it (eg mayby a Parse method that returns a FormatString object with a Format(string) method), not reparse the string every time the format method is called...
Your format string looks very much like those used in ICU MessageFormat. Did you consider using it?
Boost Formatting does that for you:
http://www.boost.org/doc/libs/1_39_0/libs/format/doc/format.html
Check out this question and answer for examples of usage:
boost::format will do the positional arguments portion, but not the date formatting...