support for stdin

TurtleValidator.js

@@ -1,45 +1,84 @@
 #!/usr/bin/env node
 
-var N3 = require('n3'), fs = require('fs'), N3Util = N3.Util;
+var N3 = require('n3'),
+    fs = require('fs'),
+    N3Util = N3.Util,
+    http = require('http'),
+    fs = require('fs');
 
-if (!process.argv[2]) {
+var validateStream = function (turtleStream) {
-	console.log('RDF N3/NTriples/Turtle file validator');
+  var parser = N3.Parser();
-	console.log('Usage: $ ttl <path-to-file>');
+  var errorCount = 0, warningCount = 0;
-	process.exit(1);
+  var regexp = {
-}
+    'dateTime' : /^(-?(?:[1-9][0-9]*)?[0-9]{4})-(1[0-2]|0[1-9])-(3[0-1]|0[1-9]|[1-2][0-9])?T(2[0-3]|[0-1][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)??(Z|[+-](?:2[0-3]|[0-1][0-9]):[0-5][0-9])?$/,
+    'double' : /[-+]?\d*([.]\d+)?/,
+    'float' : /[-+]?\d*[.]\d+/,
+    'int' : /^[-+]?(0|[1-9]\d*)$/
+  };
 
-console.log('Validating ' + process.argv[2]);
+  parser.parse(turtleStream, function(error, triple, prefixes) {
+    if (error) {
+      console.log(error);
+      errorCount++;
+    }
 
-var parser = N3.Parser(), turtleStream = fs.createReadStream(process.argv[2]);
+    if (triple) {
+      if (N3Util.isLiteral(triple.object)) {
+        var value = N3Util.getLiteralValue(triple.object);
+        var type = N3Util.getLiteralType(triple.object);
 
-var errorCount = 0, warningCount = 0;
+        type = type.replace('http://www.w3.org/2001/XMLSchema#', '');
-
+        
-var regexp = {
+        if (regexp[type] && !regexp[type].test(value)) {
-	'dateTime' : /^(-?(?:[1-9][0-9]*)?[0-9]{4})-(1[0-2]|0[1-9])-(3[0-1]|0[1-9]|[1-2][0-9])?T(2[0-3]|[0-1][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)??(Z|[+-](?:2[0-3]|[0-1][0-9]):[0-5][0-9])?$/,
+	  console.log('WARNING: xsd:', type, 'does not validate for literal. {', triple.subject, triple.predicate, triple.object, '}');
-	'double' : /[-+]?\d*([.]\d+)?/,
+	  warningCount++;
-	'float' : /[-+]?\d*[.]\d+/,
+        }
-	'int' : /^[-+]?(0|[1-9]\d*)$/
+      }
+    } else {
+      console.log('Validation done:', errorCount, 'errors and', warningCount ,'warnings found.');
+    }
+  });
 };
 
-parser.parse(turtleStream, function(error, triple, prefixes) {
+var help = function () {
-	if (error) {
+  // In all other cases, let's help the user and return some help
-		console.log(error);
+  console.log('RDF NTriples/Turtle validator using Ruben Verborgh\'s N3 nodejs library');
-		errorCount++;
+  console.log('© 2014 - MMLab - Ghent University - iMinds');
-	}
+  console.log('Source code: https://github.com/MMLab/TurtleValidator');
+  console.log('');
+  console.log('Examples:');
+  console.log('');
+  console.log('  $ ttl <path-to-file>');
+  console.log('  $ curl http://data.linkeddatafragments.org/dbpedia -H "accept: text/turtle" | ttl');
+  console.log('  $ ttl http://triples.demo.thedatatank.com/demo.ttl');
+};
+
+if (process.argv[2] && (process.argv[2] === "-h" || process.argv[2] === "--help") ) {
+  help();
+} else if (process.argv.length === 2) {
+  // Use stdio as an input stream
+  validateStream(process.stdin);
+} else if (process.argv.length === 3 ) {
+  // Create a stream from the file, whether it is a local file or a http stream
+  var filename = process.argv[2];
+  fs.exists(filename, function (exists) {
+    if (exists) {
+      try{
+        validateStream(fs.createReadStream(filename));
+      } catch ( e ) {
+        console.error(e);
+      } 
+    } else {
+      try{
+        validateStream(http.get(process.argv[2]));
+      } catch ( e ) {
+        console.error(e);
+      }
+    }
+  });
+
+} else {
+  help();
+}
 
-	if (triple) {
-		if (N3Util.isLiteral(triple.object)) {
-			var value = N3Util.getLiteralValue(triple.object);
-			var type = N3Util.getLiteralType(triple.object);
 
-			type = type.replace('http://www.w3.org/2001/XMLSchema#', '');
-			
-			if (regexp[type] && !regexp[type].test(value)) {
-				console.log('WARNING: xsd:', type, 'does not validate for literal. {', triple.subject, triple.predicate, triple.object, '}');
-				warningCount++;
-			}
-		}
-	} else {
-		console.log('Validation done:', errorCount, 'errors and', warningCount ,'warnings found.');
-	}
-});

package.json

@@ -3,7 +3,9 @@
   "version": "0.1.0",
   "description": "This command line tool validates Turtle documents and does XSD datatype checks",
   "main": "TurtleValidator.js",
-  "bin" : { "ttl" : "./TurtleValidator.js" },
+  "bin": {
+    "ttl": "./TurtleValidator.js"
+  },
   "dependencies": {
     "n3": "~0.2.6"
   },