81 lines
1.8 KiB
Text
81 lines
1.8 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{FileReader}
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file reader for space-delimited text files@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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FileReader reads space-delimited 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 comma-separated files use link::Classes/CSVFileReader::.
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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("FileReaderTest.sc", "w");
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f.write(
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"Some space delimited items in line 1
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and then some more with several blanks 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 = FileReader.read("FileReaderTest.sc").postcs;
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// can skip empty lines:
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x = FileReader.read("FileReaderTest.sc", true).postcs;
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// can skip blank entries caused by multiple spaces:
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x = FileReader.read("FileReaderTest.sc", true, true).postcs;
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// do file open/close by hand if you prefer:
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f = File("FileReaderTest.sc", "r"); f.isOpen;
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t = FileReader(f, true, true);
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t.read;
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f.close;
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// take letter "a" as delimiter:
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x = FileReader.read("FileReaderTest.sc", true, true, delimiter: $a).postcs;
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(
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// write a test file with numbers:
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f = File("FileReadTestNum.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 = FileReader.read("FileReadTestNum.sc").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 = FileReader.readInterpret("FileReadTestNum.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("FileReadTestNum.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 = FileReader.readInterpret("FileReadTestNum.sc", true, true).postln;
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::
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]
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