Handle unset and invalid values from editor config #47

src/Validator.js

@@ -6,7 +6,7 @@ const editorconfig = require('editorconfig');
 const DEFAULTS = extend({}, require('./constants/defaults'));
 const MESSAGES = require('./constants/messages');
 const PATTERNS = require('./constants/ignorePatterns');
-const MAPPINGS = require('./constants/editorconfig-mappings');
+const MAPPINGS = require('./constants/editorconfigMappings');
 
 const ValidationError = require('./ValidationError');
 
@@ -255,15 +255,31 @@ class Validator {
 				if (typeof config === 'object') {
 					// Merge editorconfig values into the correct settings names:
 					for (key in config) {
-						if (typeof MAPPINGS[key] === 'string') {
+						if (typeof MAPPINGS[key] === 'object') {
+							// Handle "unset" special value given by editorconfig file
+							// and consider not to parse invalid types and value.
+							// See: Issue #47
+							if (
+								config[key] === 'unset' ||
+								!MAPPINGS[key].types.includes(typeof config[key]) ||
+								(
+									typeof config[key] === 'string' &&
+									MAPPINGS[key].regexp instanceof RegExp &&
+									!MAPPINGS[key].regexp.test(config[key])
+								)
+							) {
+								this._settings[MAPPINGS[key].name] = false;
+								continue;
+							}
+
 							switch (key) {
 								case 'indent_style':
 									// The 'indent_style' property value isn't
 									// equal to the expected setting value:
-									this._settings[MAPPINGS[key]] = config[key] + 's';
+									this._settings[MAPPINGS[key].name] = config[key] + 's';
 									break;
 								default:
-									this._settings[MAPPINGS[key]] = config[key];
+									this._settings[MAPPINGS[key].name] = config[key];
 									break;
 							}
 						}

src/Validator.test.js

@@ -159,7 +159,7 @@ describe('The validator', () => {
 				expect(validator._settings.trailingspaces).toBeFalsy();
 				expect(validator._settings.newline).toBeFalsy();
 				expect(validator._settings.indentation).toBe('tabs');
-				expect(validator._settings.spaces).toBe('tab');
+				expect(validator._settings.spaces).toBe(false);
 				expect(validator._settings.endOfLine).toBe('lf');
 
 				// Unchanged:
@@ -210,11 +210,61 @@ describe('The validator', () => {
 
 				// test for expected properties by editorconfig:
 				expect(validator._settings.indentation).toBe('tabs');
-				expect(validator._settings.spaces).toBe('tab');
+				expect(validator._settings.spaces).toBe(false);
 				expect(validator._settings.trailingspaces).toBeTruthy();
 				expect(validator._settings.newline).toBeTruthy();
 			});
 
+			it('should parse "unset" value as false', () => {
+				// fake loading:
+				const validator = new Validator({
+					editorconfig: __fromFixtures('.editorconfig.unset'),
+
+					trailingspaces: true,
+					newline: true,
+
+					indentation: 'spaces',
+					spaces: 2,
+					endOfLine: true,
+				});
+
+				// Load editorconfig with extension where options are disabled:
+				validator._path = __fromFixtures('core.fixture');
+				validator._loadSettings();
+				expect(validator._settings).toEqual(expect.objectContaining({
+					trailingspaces: false,
+					newline: false,
+					indentation: false,
+					spaces: false,
+					endOfLine: false,
+				}))
+			});
+
+			it('should parse invalid value as false', () => {
+				// fake loading:
+				const validator = new Validator({
+					editorconfig: __fromFixtures('.editorconfig.invalid'),
+
+					trailingspaces: true,
+					newline: true,
+
+					indentation: 'spaces',
+					spaces: 2,
+					endOfLine: true,
+				});
+
+				// Load editorconfig with extension where options are disabled:
+				validator._path = __fromFixtures('core.fixture');
+				validator._loadSettings();
+				expect(validator._settings).toEqual(expect.objectContaining({
+					trailingspaces: false,
+					newline: false,
+					indentation: false,
+					spaces: false,
+					endOfLine: false,
+				}))
+			});
+
 			it('should throw if is not a file', () => {
 				const file = __fromFixtures('core.fixture');
 				[

src/__fixtures__/.editorconfig.invalid

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = cf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.fixture]
+indent_style = foo
+indent_size = bar
+end_of_line = baz
+insert_final_newline = qux
+trim_trailing_whitespace = quux

src/__fixtures__/.editorconfig.unset

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = cf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.fixture]
+indent_style = unset
+indent_size = unset
+end_of_line = unset
+insert_final_newline = unset
+trim_trailing_whitespace = unset

src/constants/defaults.js

@@ -12,5 +12,5 @@ module.exports = {
 	editorconfig: false, // path to editor-config file
 	rcconfig: false, // path to rc-config file
 	allowsBOM: false,
-	end_of_line: false, // 'LF' or 'CRLF' or 'CR' or false to disable checking
+	endOfLine: false, // 'LF' or 'CRLF' or 'CR' or false to disable checking
 };

src/constants/editorconfigMappings.js

@@ -0,0 +1,32 @@
+module.exports = {
+	charset: {
+		name: 'encoding',
+		types: ['string'],
+		regexp: /^.*$/,
+	},
+	insert_final_newline: {
+		name: 'newline',
+		types: ['boolean'],
+		regexp: false,
+	},
+	indent_style: {
+		name: 'indentation',
+		types: ['string'],
+		regexp: /^tab|space$/i,
+	},
+	indent_size: {
+		name: 'spaces',
+		types: ['number'],
+		regexp: false,
+	},
+	trim_trailing_whitespace: {
+		name: 'trailingspaces',
+		types: ['boolean'],
+		regexp: false,
+	},
+	end_of_line: {
+		name: 'endOfLine',
+		types: ['string'],
+		regexp: /^lf|crlf|cr$/i,
+	},
+};