Add support for strict mode

.editorconfig

@@ -0,0 +1,11 @@
+# EditorConfig is awesome:
+http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*.js]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 4

index.js

@@ -25,6 +25,8 @@ module.exports = function (args, opts) {
 
 	var flags = {
 		bools: {},
+		// known: {},
+		numbers: {},
 		strings: {},
 		unknownFn: null,
 	};
@@ -64,6 +66,7 @@ module.exports = function (args, opts) {
 		});
 	});
 
+	// populating flags.strings with explicit keys and aliases
 	[].concat(opts.string).filter(Boolean).forEach(function (key) {
 		flags.strings[key] = true;
 		if (aliases[key]) {
@@ -73,15 +76,36 @@ module.exports = function (args, opts) {
 		}
 	});
 
+	// populating flags.numbers with explicit keys and aliases
+	[].concat(opts.number).filter(Boolean).forEach(function (key) {
+		flags.numbers[key] = true;
+		if (aliases[key]) {
+			[].concat(aliases[key]).forEach(function (k) {
+				flags.numbers[k] = true;
+			});
+		}
+	});
+
+	// [].concat(opts.known).filter(Boolean).forEach(function (key) {
+	// 	flags.known[key] = true;
+	// });
+
 	var defaults = opts.default || {};
 
 	var argv = { _: [] };
 
-	function argDefined(key, arg) {
-		return (flags.allBools && (/^--[^=]+$/).test(arg))
-			|| flags.strings[key]
+	function keyDefined(key) {
+		return flags.strings[key]
+			|| flags.numbers[key]
 			|| flags.bools[key]
 			|| aliases[key];
+		// || flags.known[key];
+	}
+
+	function argDefined(key, arg) {
+		// legacy test for whether to call unknownFn
+		return (flags.allBools && (/^--[^=]+$/).test(arg))
+			|| keyDefined(key);
 	}
 
 	function setKey(obj, keys, value) {
@@ -120,14 +144,42 @@ module.exports = function (args, opts) {
 		}
 	}
 
+	function checkStrictVal(key, val) {
+		// Have a separate routine from setArg to avoid affecting non-strict results,
+		// as the strict checks need less processed values.
+		if (opts.strict) {
+			if (flags.strings[key] && val === true) {
+				throw new Error('Missing option value for option "' + key + '"');
+			}
+			if (flags.numbers[key] && !(isNumber(val) || val === false)) {
+				throw new Error('Expecting number value for option "' + key + '"');
+			}
+			if (isBooleanKey(key) && typeof val === 'string' && !(/^(true|false)$/).test(val)) {
+				throw new Error('Unexpected option value for option "' + key + '"');
+			}
+			if (!keyDefined(key)) {
+				throw new Error('Unknown option "' + key + '"');
+			}
+		}
+	}
+
 	function setArg(key, val, arg) {
 		if (arg && flags.unknownFn && !argDefined(key, arg)) {
 			if (flags.unknownFn(arg) === false) { return; }
 		}
 
-		var value = !flags.strings[key] && isNumber(val)
-			? Number(val)
-			: val;
+		var value = val;
+		if (flags.numbers[key]) {
+			if (isNumber(val)) {
+				value = Number(val);
+			} else if (value === false) {
+				value = val; // --no-foo
+			} else {
+				value = NaN;
+			}
+		} else if (!flags.strings[key] && isNumber(val)) {
+			value = Number(val);
+		}
 		setKey(argv, key.split('.'), value);
 
 		(aliases[key] || []).forEach(function (x) {
@@ -162,12 +214,14 @@ module.exports = function (args, opts) {
 			var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
 			key = m[1];
 			var value = m[2];
+			checkStrictVal(key, value);
 			if (isBooleanKey(key)) {
 				value = value !== 'false';
 			}
 			setArg(key, value, arg);
 		} else if ((/^--no-.+/).test(arg)) {
 			key = arg.match(/^--no-(.+)/)[1];
+			checkStrictVal(key, false);
 			setArg(key, false, arg);
 		} else if ((/^--.+/).test(arg)) {
 			key = arg.match(/^--(.+)/)[1];
@@ -178,12 +232,20 @@ module.exports = function (args, opts) {
 				&& !isBooleanKey(key)
 				&& !flags.allBools
 			) {
+				checkStrictVal(key, next);
 				setArg(key, next, arg);
 				i += 1;
 			} else if ((/^(true|false)$/).test(next)) {
+				checkStrictVal(key, next);
 				setArg(key, next === 'true', arg);
 				i += 1;
+			} else if (flags.numbers[key] && isNumber(next)) {
+				// This is a second look to pick up negative numbers.
+				checkStrictVal(key, next);
+				setArg(key, next, arg);
+				i += 1;
 			} else {
+				checkStrictVal(key, true);
 				setArg(key, flags.strings[key] ? '' : true, arg);
 			}
 		} else if ((/^-[^-]+/).test(arg)) {
@@ -194,11 +256,13 @@ module.exports = function (args, opts) {
 				next = arg.slice(j + 2);
 
 				if (next === '-') {
+					checkStrictVal(letters[j], next);
 					setArg(letters[j], next, arg);
 					continue;
 				}
 
 				if ((/[A-Za-z]/).test(letters[j]) && next[0] === '=') {
+					checkStrictVal(letters[j], next.slice(1));
 					setArg(letters[j], next.slice(1), arg);
 					broken = true;
 					break;
@@ -208,16 +272,19 @@ module.exports = function (args, opts) {
 					(/[A-Za-z]/).test(letters[j])
 					&& (/-?\d+(\.\d*)?(e-?\d+)?$/).test(next)
 				) {
+					checkStrictVal(letters[j], next);
 					setArg(letters[j], next, arg);
 					broken = true;
 					break;
 				}
 
 				if (letters[j + 1] && letters[j + 1].match(/\W/)) {
+					checkStrictVal(letters[j], arg.slice(j + 2));
 					setArg(letters[j], arg.slice(j + 2), arg);
 					broken = true;
 					break;
 				} else {
+					checkStrictVal(letters[j], true);
 					setArg(letters[j], flags.strings[letters[j]] ? '' : true, arg);
 				}
 			}
@@ -229,12 +296,20 @@ module.exports = function (args, opts) {
 					&& !(/^(-|--)[^-]/).test(args[i + 1])
 					&& !isBooleanKey(key)
 				) {
+					checkStrictVal(key, args[i + 1]);
 					setArg(key, args[i + 1], arg);
 					i += 1;
 				} else if (args[i + 1] && (/^(true|false)$/).test(args[i + 1])) {
+					checkStrictVal(key, args[i + 1]);
 					setArg(key, args[i + 1] === 'true', arg);
 					i += 1;
+				} else if (flags.numbers[key] && isNumber(args[i + 1])) {
+					// This is a second look to pick up negative numbers.
+					checkStrictVal(key, args[i + 1]);
+					setArg(key, args[i + 1], arg);
+					i += 1;
 				} else {
+					checkStrictVal(key, true);
 					setArg(key, flags.strings[key] ? '' : true, arg);
 				}
 			}

test/bool.js

@@ -143,6 +143,55 @@ test('boolean --boool=false', function (t) {
 	t.end();
 });
 
+test('boolean --boool=other', function (t) {
+	// legacy edge case
+	var parsed = parse(['--boool=other'], {
+		default: {
+			boool: false,
+		},
+		boolean: ['boool'],
+	});
+
+	t.same(parsed.boool, true);
+	t.end();
+});
+
+test('boolean -b=true', function (t) {
+	var parsed = parse(['-b=true'], {
+		default: {
+			b: false,
+		},
+		boolean: ['b'],
+	});
+
+	t.same(parsed.b, 'true'); // [sic] legacy behaviour
+	t.end();
+});
+
+test('boolean -b=false', function (t) {
+	var parsed = parse(['-b=false'], {
+		default: {
+			b: true,
+		},
+		boolean: ['b'],
+	});
+
+	t.same(parsed.b, 'false'); // [sic] legacy behaviour
+	t.end();
+});
+
+test('boolean -b=other', function (t) {
+	var parsed = parse(['-b=other'], {
+		default: {
+			b: false,
+		},
+		boolean: ['b'],
+	});
+
+	t.same(parsed.b, 'other'); // [sic] legacy behaviour
+	t.end();
+});
+
 test('boolean using something similar to true', function (t) {
 	var opts = { boolean: 'h' };
 	var result = parse(['-h', 'true.txt'], opts);

test/num.js

@@ -3,7 +3,7 @@
 var parse = require('../');
 var test = require('tape');
 
-test('nums', function (t) {
+test('implicit nums', function (t) {
 	var argv = parse([
 		'-x', '1234',
 		'-y', '5.67',
@@ -36,3 +36,79 @@ test('already a number', function (t) {
 	t.deepEqual(typeof argv._[0], 'number');
 	t.end();
 });
+
+test('number type: short option', function (t) {
+	var options = { number: 'n' };
+	var argv = parse(['-n', '123'], options);
+	t.deepEqual(argv, { n: 123, _: [] });
+
+	argv = parse(['-n', '-123'], options);
+	t.deepEqual(argv, { n: -123, _: [] });
+
+	argv = parse(['-n=123'], options);
+	t.deepEqual(argv, { n: 123, _: [] });
+
+	argv = parse(['-n', 'xyz'], options);
+	t.deepEqual(argv, { n: NaN, _: [] });
+
+	argv = parse(['-n=xyz'], options);
+	t.deepEqual(argv, { n: NaN, _: [] });
+
+	// Special case of missing argument value
+	argv = parse(['-n'], options);
+	t.deepEqual(argv, { n: NaN, _: [] });
+
+	t.end();
+});
+
+test('number type: long option', function (t) {
+	var options = { number: 'num' };
+	var argv = parse(['--num', '123'], options);
+	t.deepEqual(argv, { num: 123, _: [] });
+
+	argv = parse(['--num', '-123'], options);
+	t.deepEqual(argv, { num: -123, _: [] });
+
+	argv = parse(['--num=123'], options);
+	t.deepEqual(argv, { num: 123, _: [] });
+
+	argv = parse(['--num', 'xyz'], options);
+	t.deepEqual(argv, { num: NaN, _: [] });
+
+	argv = parse(['--num=xyz'], options);
+	t.deepEqual(argv, { num: NaN, _: [] });
+
+	// Special case of missing argument value
+	argv = parse(['--num'], options);
+	t.deepEqual(argv, { num: NaN, _: [] });
+
+	// Special case of negated
+	argv = parse(['--no-num'], options);
+	t.deepEqual(argv, { num: false, _: [] });
+
+	t.end();
+});
+
+test('number: alias', function (t) {
+	var options = { number: 'num', alias: { num: 'n' } };
+	var argv = parse(['-n', '123'], options);
+	t.deepEqual(argv, { n: 123, num: 123, _: [] });
+
+	// argv = parse(['-n', '-123'], options);
+	// t.deepEqual(argv, { n: -123, num: 123, _: [] });
+
+	argv = parse(['-n=123'], options);
+	t.deepEqual(argv, { n: 123, num: 123, _: [] });
+
+	argv = parse(['-n', 'xyz'], options);
+	t.deepEqual(argv, { n: NaN, num: NaN, _: [] });
+
+	argv = parse(['-n=xyz'], options);
+	t.deepEqual(argv, { n: NaN, num: NaN, _: [] });
+
+	// Special case of missing argument value
+	argv = parse(['-n'], options);
+	t.deepEqual(argv, { n: NaN, num: NaN, _: [] });
+
+	t.end();
+});