Merge pull request #22 from clue-labs/tsv

Add reference to TSV (Tab-Separated Values)

Author: clue

README.md

@@ -128,6 +128,16 @@ to process newline-delimited JSON (NDJSON) files (`.ndjson` file extension).
 {"name":"Bob","age":50,"comment":"Hello\nWorld!"}
 ```
 
+As another alternative, if you want to use a CSV-variant that avoids some of its
+shortcomings (and is somewhat faster!), you may want to use [clue/reactphp-tsv](https://github.com/clue/reactphp-tsv)
+to process Tab-Separated-Values (TSV) files (`.tsv` file extension).
+
+```tsv
+name	age	comment
+Alice	30	Yes, I like cheese
+Bob	50	Hello world!
+```
+
 ## Usage
 
 ### Decoder
@@ -407,6 +417,10 @@ This project is released under the permissive [MIT license](LICENSE).
   you may want to use [clue/reactphp-ndjson](https://github.com/clue/reactphp-ndjson)
   to process newline-delimited JSON (NDJSON) files (`.ndjson` file extension).
 
+* If you want to process a slightly simpler text-based tabular data format,
+  you may want to use [clue/reactphp-tsv](https://github.com/clue/reactphp-tsv)
+  to process Tab-Separated-Values (TSV) files (`.tsv` file extension).
+
 * If you want to process compressed CSV files (`.csv.gz` file extension)
   you may want to use [clue/reactphp-zlib](https://github.com/clue/reactphp-zlib)
   on the compressed input stream before passing the decompressed stream to the CSV decoder.

examples/11-csv2ndjson.php

@@ -1,6 +1,7 @@
 <?php
 
 // $ php examples/11-csv2ndjson.php < examples/users.csv > examples/users.ndjson
+// see also https://github.com/clue/reactphp-ndjson
 
 use Clue\React\Csv\AssocDecoder;
 use React\EventLoop\Factory;

examples/12-csv2tsv.php

@@ -0,0 +1,55 @@
+<?php
+
+// $ php examples/12-csv2tsv.php < examples/users.csv > examples/users.tsv
+// see also https://github.com/clue/reactphp-tsv
+
+use Clue\React\Csv\Decoder;
+use React\EventLoop\Factory;
+use React\Stream\ReadableResourceStream;
+use React\Stream\WritableResourceStream;
+use React\Stream\ThroughStream;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$loop = Factory::create();
+
+$exit = 0;
+$in = new ReadableResourceStream(STDIN, $loop);
+$out = new WritableResourceStream(STDOUT, $loop);
+$info = new WritableResourceStream(STDERR, $loop);
+
+$delimiter = isset($argv[1]) ? $argv[1] : ',';
+
+$decoder = new Decoder($in, $delimiter);
+
+$encoder = new ThroughStream(function ($data) {
+    $data = \array_map(function ($value) {
+        return \addcslashes($value, "\0..\37");
+    }, $data);
+
+    return \implode("\t", $data) . "\n";
+});
+
+$decoder->pipe($encoder)->pipe($out);
+
+$decoder->on('error', function (Exception $e) use ($info, &$exit) {
+    $info->write('ERROR: ' . $e->getMessage() . PHP_EOL);
+    $exit = 1;
+});
+
+// TSV files MUST include a header line, so complain if CSV input ends without a single line
+$decoder->on('end', $empty = function () use ($info, &$exit) {
+    $info->write('ERROR: Empty CSV input' . PHP_EOL);
+    $exit = 1;
+});
+$decoder->once('data', function () use ($decoder, $empty) {
+    $decoder->removeListener('end', $empty);
+});
+
+$info->write('You can pipe/write a valid CSV stream to STDIN' . PHP_EOL);
+$info->write('Valid TSV (Tab-Separated Values) will be forwarded to STDOUT' . PHP_EOL);
+$info->write('Invalid CSV will raise an error on STDERR and exit with code 1' . PHP_EOL);
+
+$loop->run();
+
+exit($exit);