rewrite const as single element enum

Author: MikeRalphson

index.js

@@ -29,6 +29,7 @@ function stripIllegalKeywords(schema) {
 function convertSchema(schema, path, parent, parentPath) {
 	schema = stripIllegalKeywords(schema);
 	schema = convertTypes(schema);
+	schema = rewriteConst(schema);
 	schema = convertDependencies(schema);
 
 	if (typeof schema['patternProperties'] === 'object') {
@@ -137,7 +138,17 @@ function convertTypes(schema) {
 function convertPatternProperties(schema) {
 	schema['x-patternProperties'] = schema['patternProperties'];
 	delete schema['patternProperties'];
+	if (typeof schema.additionalProperties === 'undefined') schema.additionalProperties = true;
+	return schema;
+}
+
+function rewriteConst(schema) {
+	if (schema.const) {
+		schema.enum = [ schema.const ];
+		delete schema.const;
+	}
 	return schema;
 }
 
 module.exports = convert;
+

test/const.test.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const convert = require('../');
+const should = require('should');
+
+it('const', () => {
+	const schema = {
+		$schema: 'http://json-schema.org/draft-04/schema#',
+		type: 'string',
+		const: 'hello'
+	};
+
+	const result = convert(schema);
+
+	const expected = {
+		type: 'string',
+		enum: [ 'hello' ]
+	};
+
+	should(result).deepEqual(expected, 'converted');
+});