add schema validation

lib/cli.js

@@ -1,10 +1,13 @@
 #!/usr/bin/env node
 
 var fs = require("fs");
+var path = require("path");
 var parser = require("./jsonlint").parser;
+var JSV = require("JSV").JSV;
+
 var options = require("nomnom")
-  .scriptName("jsonlint")
-  .opts({
+  .script("jsonlint")
+  .options({
     file: {
       position: 0,
       help: "file to parse; otherwise uses stdin"
@@ -14,7 +17,7 @@ var options = require("nomnom")
       string: '-v, --version',
       help: 'print version and exit',
       callback: function() {
-        return JSON.parse(fs.readFileSync(__dirname + "/../package.json", "utf8")).version;
+        return require("../package").version;
       }
     },
     sort : {
@@ -36,37 +39,64 @@ var options = require("nomnom")
         flag : true,
         string: '-c, --compact',
         help : 'compact error display'
+    },
+    validate : {
+        string: '-V, --validate',
+        help : 'a JSON schema to use for validation'
+    },
+    env : {
+        string: '-e, --environment',
+        "default": "json-schema-draft-03",
+        help: 'which specification of JSON Schema the validation file uses'
     }
-  })
-  .parseArgs();
+  }).parse();
 
 if (options.compact) {
-    var fileName = options.file? options.file + ': ' : '';
-    parser.parseError = parser.lexer.parseError = function(str, hash) {
-        console.error(fileName + 'line '+ hash.loc.first_line +', col '+ hash.loc.last_column +', found: \''+ hash.token +'\' - expected: '+ hash.expected.join(', ') +'.');
-        throw new Error(str);
-    };
+  var fileName = options.file? options.file + ': ' : '';
+  parser.parseError = parser.lexer.parseError = function(str, hash) {
+      console.error(fileName + 'line '+ hash.loc.first_line +', col '+ hash.loc.last_column +', found: \''+ hash.token +'\' - expected: '+ hash.expected.join(', ') +'.');
+      throw new Error(str);
+  };
 }
 
 function parse (source) {
   try {
     var parsed = options.sort ?
-                    sortObject(parser.parse(source)) :
-                    parser.parse(source);
+                  sortObject(parser.parse(source)) :
+                  parser.parse(source);
+
+    if (options.validate) {
+      var env = JSV.createEnvironment(options.env);
+      var schema = JSON.parse(fs.readFileSync(path.normalize(options.validate), "utf8"));
+      var report = env.validate(parsed, schema);
+      if (report.errors.length) {
+        throw report.errors.reduce(schemaError, 'Validation Errors:');
+      }
+    }
+
     return JSON.stringify(parsed,null,options.indent);
   } catch (e) {
     if (! options.compact) {
-        console.log(e);
+        console.error(e);
     }
     process.exit(1);
   }
 }
 
+function schemaError (str, err) {
+  return str +
+         "\n\n"+err.message +
+         "\nuri: " + err.uri +
+         "\nschemaUri: " + err.schemaUri +
+         "\nattribute: " + err.attribute +
+         "\ndetails: " + JSON.stringify(err.details);
+}
+
 function main (args) {
   var source = '';
   if (options.file) {
-    var path = require('path').normalize(options.file);
-    source = parse(fs.readFileSync(path, "utf8"));
+    var json = path.normalize(options.file);
+    source = parse(fs.readFileSync(json, "utf8"));
     if (options.inplace) {
       fs.writeSync(fs.openSync(path,'w+'), source, 0, "utf8");
     } else {

package.json

@@ -25,7 +25,8 @@
     "node": ">= 0.6"
   },
   "dependencies": {
-    "nomnom": ">= 1.x.x"
+    "nomnom": ">= 1.5.x",
+    "JSV": ">= 4.0.x"
   },
   "devDependencies": {
     "test": "*",