Getting a specific line from a file in Haxe

[Andy Green]

In Haxe, is it possible to obtain a specific line from a file (using one of the standard classes, such as Sys)?

static function getMethodName(lineNumber, fileName){

//Is there a method that does this?

}

[j...@justinfront.net]

You can with trace...

http://haxe.org/doc/cross/trace

And also with macros but unsure of details.

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[David Peek]

static function readLine(path:String, line:Int):String

{

if (line < 1) throw "Can't read line " + line;

var out = sys.io.File.read(path);

for (i in 0...line - 1) out.readLine();

var line = out.readLine();

out.close();

return line;

}

[Mihail Ivanchev]

A bit hacky and slow, but quick:

File.getContent(path).split("\n")[lineNumber - 1];

I am using this code in exactly the same case as you, processing CTAGs info and generating code stubs.

Regards,

Mihail

[Andy Green]

Is it really possible to print the lines from a file using the trace method alone? I don't see anything in the documentation that suggests that.

[Mihail Ivanchev]

It's not possible.

[j...@justinfront.net]

Sorry Mihail your wrong, it is possible I have done it lots of times, it was in the first haxe book, but never really thought about it.

Just double checked with js target... 

Read the page carefully ( especially the last part ) and then add this to your Main class....

    static function traceComment( comment : String, ?pos : haxe.PosInfos )

    {

        haxe.Log.trace( comment + " :: Line no " + pos.lineNumber );

    }

Then test...

96        Main.traceComment( 'this is line 96' );

It will trace out...

"this is line 96 :: Line no 96"

Best 

Justin

On 13 Nov 2012, at 14:40, Mihail Ivanchev wrote:

It's not possible.

[Mihail Ivanchev]

Oh yeah, Justin, it's possible to print the line of the trace in the source file, of course, you're 100% correct, but it's not possible to load an external file, navigate to a line, and print that line:

trace("myfile.txt", 75);

[j...@justinfront.net]

Oh sorry missed the meaning of the question... oops.

Well you need to load it in and have a callback for loaded, and put the characters in a string then something like fileString.split('\n').[75];   or \r\n or \r.

I have parsed CSV files in haxe flash lots of times.