I know it can be done in other languages like Powershell, I did a lot of searching but couldn't find any how it can be done in node.js or javascript.
For example let's say I have:
carModel,price,color
"Audi",10000,"blue"
"BMW",15000,"red"
"Mercedes",20000,"yellow"
"Porsche",30000,"green"
and I want to append to line 3 something like:
carModel,price,color,errorcode,errormsg
"Audi",10000,"blue"
"BMW",15000,"red","05","wrong price"
"Mercedes",20000,"yellow"
"Porsche",30000,"green"
My question isn't really about how to solve the above, but:
Is there any way to manipulate a csv file in js directly without converting it to json objects and converting it back to csv?
Is there any way to manipulate a csv file in js directly...
Sure, you could read it all into memory as one big string, then splice content into the string. It probably wouldn't be a great idea, though, as compared to at least reading it in as an array of strings or an array of arrays.
Also note that reading a CSV can be more work than it seems thanks to line breaks within quoted fields, etc., so you're probably best off using one of the CSV parser npm modules...
Related
I'm pretty new to coding in general, and am trying to create an editor plugin which uses sublime files like sublime-syntax and tmThemes for things like syntax highlighting. However I need to find a way to parse XML by key value so that i can simply search through tmTheme files like settings.backgroundcolor etc... in js.
How would I be able to do this in JS?
As tmTheme format is indeed just plain XML, you would want to find yourself a XML parser (there is more than enough of these) and pick it apart - the format is pretty straightforward, the only subject of consideration would be <dict> (for which you would have to loop over it's children to recognize subsequent <key>+<value> pairs.
I have already looked here, here, and here:
D3.js: How to combine 2 datasets in order to create a map and show values on.mouseover?
How to add properties to topojson file?
https://github.com/topojson/topojson-1.x-api-reference/blob/master/Command-Line-Reference.md
They were a great help in getting me as close as I am now. However, I'm attempting to recursively parse several datasets in .tsv format and join them together with the json geometry data. I use the word join loosely; I know that topojson has some command line abilities to join .tsv to the json file. I think that would simplify things a lot, but if I'm not mistaken that requires Node. I tried many times to get Node working on my computer, it is either a compatibility issue or I'm not adept enough.
So, simply put, my question is:
Bearing in mind that I don't have Node, what changes do I need to make (data file related, or other) to get my block working (parsing dynamically)
I'm assuming that it's not working because of my chaotic data structure (as suggested by the post title), but if you think its something else, let me know.
My block:
http://bl.ocks.org/diggetybo/42f4534b2168a00694219888ebb1a2fb
ternJS have several. JSON files defs which contains the definition of librarys. Can someone explain to me how I can best generate my own to my javascript libraries / or only definition objects?
I can not see that there is no common procedure for this?
There's a tool for this included in Tern. See condense at http://ternjs.net/doc/manual.html#utils . It runs Tern on your file and tries to output the types that it finds. It's far from flawless, but for simple programs it works well. For files with a complicated structure or interface, you'll often have to hand-write the definitions.
There are three ways I have thought about to solve your problem:
Using Abstract Syntax Tree Parser and Visitor
One way to solve your problem would be to use abstract syntax tree parser and visitor in order to automate the task of scanning through the code and documenting it.
The resources here will be of help:
-http://ramkulkarni.com/blog/understanding-ast-created-by-mozilla-rhino-parser/
-What is JavaScript AST, how to play with it?
You usually use a parser to retrieve a tree, and then use a visitor to visit all the nodes and do your work within there.
You will essentially have a tree representing the specific library and then you must write the code to store this in the def format you link to.
Getting a Documentation Generator and Modifying
Another idea is to download the source code for a documentation generator, e.g. https://github.com/yui/yuidoc/
By modifying the styling/output format you can generate "documentation" in the appropriate json format.
Converting Existing Documentation (HTML doc) into JSON
You can make a parser that takes a standard documentation format (I'm sure as Javadoc is one for java there should be one for javascript), and write a converter that exctracts the relevant information and stores in a JSON definition.
I have a problem I'd like to solve to not have to spend a lot of manual work to analyze as an alternative.
I have 2 JSON objects (returned from different web service API or HTTP responses). There is intersecting data between the 2 JSON objects, and they share similar JSON structure, but not identical. One JSON (the smaller one) is like a subset of the bigger JSON object.
I want to find all the interesecting data between the two objects. Actually, I'm more interested in the shared parameters/properties within the object, not really the actual values of the parameters/properties of each object. Because I want to eventually use data from one JSON output to construct the other JSON as input to an API call. Unfortunately, I don't have the documentation that defines the JSON for each API. :(
What makes this tougher is the JSON objects are huge. One spans a page if you print it out via Windows Notepad. The other spans 37 pages. The APIs return the JSON output compressed as a single line. Normal text compare doesn't do much, I'd have to reformat manually or w/ script to break up object w/ newlines, etc. for a text compare to work well. Tried with Beyond Compare tool.
I could do manual search/grep but that's a pain to cycle through all the parameters inside the smaller JSON. Could write code to do it but I'd also have to spend time to do that, and test if the code works also. Or maybe there's some ready made code already for that...
Or can look for JSON diff type tools. Searched for some. Came across these:
https://github.com/samsonjs/json-diff or https://tlrobinson.net/projects/javascript-fun/jsondiff
https://github.com/andreyvit/json-diff
both failed to do what I wanted. Presumably the JSON is either too complex or too large to process.
Any thoughts on best solution? Or might the best solution for now be manual analysis w/ grep for each parameter/property?
In terms of a code solution, any language will do. I just need a parser or diff tool that will do what I want.
Sorry, can't share the JSON data structure with you either, it may be considered confidential.
Beyond Compare works well, if you set up a JSON file format in it to use Python to pretty-print the JSON. Sample setup for Windows:
Install Python 2.7.
In Beyond Compare, go under Tools, under File Formats.
Click New. Choose Text Format. Enter "JSON" as a name.
Under the General tab:
Mask: *.json
Under the Conversion tab:
Conversion: External program (Unicode filenames)
Loading: c:\Python27\python.exe -m json.tool %s %t
Note, that second parameter in the command line must be %t, if you enter two %ss you will suffer data loss.
Click Save.
Jeremy Simmons has created a better File Format package Posted on forum: "JsonFileFormat.bcpkg" for BEYOND COMPARE that does not require python or so to be installed.
Just download the file and open it with BC and you are good to go. So, its much more simpler.
JSON File Format
I needed a file format for JSON files.
I wanted to pretty-print & sort my JSON to make comparison easy.
I have attached my bcpackage with my completed JSON File Format.
The formatting is done via jq - http://stedolan.github.io/jq/
Props to
Stephen Dolan for the utility https://github.com/stedolan.
I have sent a message to the folks at Scooter Software asking them to
include it in the page with additional formats.
If you're interested in seeing it on there, I'm sure a quick reply to
the thread with an up-vote would help them see the value posting it.
Attached Files Attached Files File Type: bcpkg JsonFileFormat.bcpkg
(449.8 KB, 58 views)
I have a small GPL project that would do the trick for simple JSON. I have not added support for nested entities as it is more of a simple ObjectDB solution and not actually JSON (Despite the fact it was clearly inspired by it.
Long and short the API is pretty simple. Make a new group, populate it, and then pull a subset via whatever logical parameters you need.
https://github.com/danielbchapman/groups
The API is used basically like ->
SubGroup items = group
.notEqual("field", "value")
.lessThan("field2", 50); //...etc...
There's actually support for basic unions and joins which would do pretty much what you want.
Long and short you probably want a Set as your data-type. Considering your comparisons are probably complex you need a more complex set of methods.
My only caution is that it is GPL. If your data is confidential, odds are you may not be interested in that license.
Mostly I have just used XML files to store config info and to provide elementary data persistence. Now I am building a website where I need to store some XML type data. However I am already using JSON extensively throughout the whole thing. Is it bad to store JSON directly instead of XML, or should I store the XML and introduce an XML parser.
Not bad at all. Although there are more XML editors, so if you're going to need to manually edit the files, XML may be better.
Differences between using XML and JSON are:
A lot easier to find an editor supporting nice way to edit XML. I'm aware of no editors that do this for JSON, but there might be some, I hope :)
Extreme portability/interoperability - not everything can read JSON natively whereas pretty much any language/framework these days has XML libraries.
JSON takes up less space
JSON may be faster to process, ESPECIALLY in a JavaScript app where it's native data.
JSON is more human readable for programmers (this is subjective but everyone I know agrees so).
Now, please notice the common thread: any of the benefits of using pure XML listed above are 100% lost immediately as soon as you store JSON as XML payload.
Therefore, the gudelines are as follows:
If wide interoperability is an issue and you talk to something that can't read JSON (like a DB that can read XML natively), use XML.
Otherwise, I'd recommend using JSON
NEVER EVER use JSON as XML payload unless you must use XML as a transport container due to existing protocol needs AND the cost of encoding and decoding JSON to/from XML is somehow prohibitively high as compared to network/storage lossage due to double encoding (I have a major trouble imagining a plausible scenario like this, but who knows...)
UPDATED: Removed Unicode bullets as per info in comments
It's just data, like XML. There's nothing about it that would preclude saving it to disk.
Define "bad". They're both just plain-text formats. Knock yourself out.
If your storing the data as a cache (meaning it was in one format and you had to process it programatically to "make" it JSON. Then I say no problem. As long as the consumer of your JSON reads native JSON then it's standard practice to save cache data to disk or memory.
However if you're storing a configuration file in JSON which needs human interaction to "process" then I may reconsider. Using JSON for simple Key:Value pairs is cool, but anything beyond that, the format may be too compact (meaning nested { and [ brackets can be hard to decipher).
one potential issue with JSON, when there is deep nesting, is readability,
you may actually see ]]]}], making debugging difficult