77 lines
1.7 KiB
Text
77 lines
1.7 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{CSVFileReader}
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file reader for comma separated data@section{related}
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Classes/File
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@section{categories}
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Files
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@section{description}
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CSVFileReader reads comma-separated text files into 2D arrays line by line.
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For tab delimited files use link::Classes/TabFileReader::. For semi-colon-delimited files use link::Classes/SemiColonFileReader::. For space-delimited files, or custom delimiters, use link::Classes/FileReader::.
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@section{Examples}
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@racketblock[
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(
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// write a test file:
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f = File("CSVReadTest.sc", "w");
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f.write(
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"Some,comma,delimited,items, in line 1
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and then, some more, with several commas,,,, in line 3
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"
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);
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f.close;
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)
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// open file, read and put strings into array, close file.
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x = CSVFileReader.read("CSVReadTest.sc").postcs;
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// can skip empty lines:
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x = CSVFileReader.read("CSVReadTest.sc", true).postcs;
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// can skip blank entries caused by multiple commas:
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x = CSVFileReader.read("CSVReadTest.sc", true, true).postcs;
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// do file open/close by hand if you prefer:
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f = File("CSVReadTest.sc", "r"); f.isOpen;
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t = CSVFileReader(f);
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t.read(true, true).postcs;
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f.close;
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(
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// write a test file with numbers:
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f = File("CSVReadTestNum.sc", "w");
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(1..10).do { |n| f.write(n.asString ++ ","); };
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f.close;
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)
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x = CSVFileReader.read("CSVReadTestNum.sc", true, true).postcs;
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x.collect(_.collect(_.interpret)); // convert to numbers.
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// or do it immediately:
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x = CSVFileReader.readInterpret("CSVReadTestNum.sc").postcs;
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(
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// write a test file with several lines of numbers:
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f = File("CSVReadTestNum.sc", "w");
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(1..100).do { |n|
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f.write(n.asString ++ if (n % 10 != 0, ",", Char.nl)); };
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f.close;
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)
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x = CSVFileReader.readInterpret("CSVReadTestNum.sc", true, true).postln;
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]
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