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@mkrause/match

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@mkrause/match - npm Package Compare versions

Comparing version
1.0.15
 to
1.0.16
+194
lib-cjs/match.js
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.matchSingleKey = exports.getSingleKey = exports.matchType = exports.match = exports.matcher = undefined;
var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
var _lodash = require('lodash');
var _lodash2 = _interopRequireDefault(_lodash);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
// Utility
var getSingleKey = function getSingleKey(obj) {
if (!_lodash2.default.isPlainObject(obj)) {
throw new Error('Error: expected object, given \'' + JSON.stringify(obj) + '\'');
}
var keys = Object.keys(obj);
if (keys.length !== 1) {
throw new Error('Error: expected object with single key, given \'' + JSON.stringify(obj) + '\'');
}
var key = keys[0];
return { key: key, value: obj[key] };
};
// Common definitions
var defaultCase = Symbol('match.default');
var defs = {
case: function _case(predicate, value) {
return [predicate, value];
},
otherwise: function otherwise(fn) {
return [defaultCase, fn];
},
default: defaultCase
};
// Match against an object, where each property is one case:
// match('x', { x: 1, y: 2 })
var matchAgainstObject = function matchAgainstObject(discriminator, body, cases) {
var matchedCase = void 0;
if (cases.hasOwnProperty(discriminator)) {
matchedCase = cases[discriminator];
} else if (cases.hasOwnProperty(defs.default)) {
matchedCase = cases[defs.default];
} else {
throw new Error('[match.js] Unmatched case: ' + JSON.stringify(discriminator));
}
// If the property is a function, pass the subject body
var result = void 0;
if (_lodash2.default.isFunction(matchedCase)) {
result = matchedCase(body);
} else {
result = matchedCase;
}
return result;
};
// Match against a list of predicate functions:
// match({ type: 'x' }, [{ type: 'x' }, 1], [{ type: 'y' }, 2])
var matchAgainstPredicates = function matchAgainstPredicates(discriminator, body, predicates) {
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = predicates[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
var _step$value = _slicedToArray(_step.value, 2),
predicate = _step$value[0],
predicateCase = _step$value[1];
// If given an object
if (_lodash2.default.isObjectLike(predicate)) {
predicate = _lodash2.default.matches(predicate);
}
var matchedCase = void 0;
if (predicate === discriminator) {
matchedCase = predicateCase;
} else if (_lodash2.default.isFunction(predicate) && predicate(discriminator) == true) {
// Note: using weak equality (==) for predicate check
matchedCase = predicateCase;
} else if (predicate === defs.default) {
matchedCase = predicateCase;
}
if (matchedCase !== undefined) {
if (_lodash2.default.isFunction(matchedCase)) {
return matchedCase(body);
} else {
return matchedCase;
}
}
}
// Fall-through: no match
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
throw new Error('[match.js] Unmatched case: ' + JSON.stringify(discriminator));
};
// Create a new matcher using the given parser
var matcher = function matcher(parseSubject) {
var matcher = function matcher(subject) {
for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
args[_key - 1] = arguments[_key];
}
var _parseSubject = parseSubject(subject),
discriminator = _parseSubject.discriminator,
body = _parseSubject.body;
var result = void 0;
if (args.length === 1 && _lodash2.default.isPlainObject(args[0])) {
var cases = args[0];
result = matchAgainstObject(discriminator, body, cases);
} else if (args.length === 1 && _lodash2.default.isArray(args[0])) {
var predicates = args[0];
result = matchAgainstPredicates(discriminator, body, predicates);
} else if (args.length >= 1) {
var _predicates = args;
result = matchAgainstPredicates(discriminator, body, _predicates);
} else {
throw new Error('[match.js] Invalid arguments given');
}
return result;
};
return Object.assign(matcher, defs);
};
// Specific matchers
// Generic match. Accept any subject, and discriminate using the value itself
var match = matcher(function (subject) {
return { discriminator: subject, body: subject };
});
// Match on objects with a `type` property
var matchType = matcher(function (subject) {
if (!_lodash2.default.isObjectLike(subject)) {
throw new Error('[match.js] Expected an object, given ' + JSON.stringify(subject));
}
if (!subject.hasOwnProperty('type')) {
throw new Error('[match.js] Missing \'type\' property, given ' + JSON.stringify(subject));
}
return { discriminator: subject.type, body: subject };
});
var matchSingleKey = matcher(function (subject) {
if (!_lodash2.default.isObjectLike(subject)) {
throw new Error('[match.js] Expected an object, given ' + JSON.stringify(subject));
}
var keys = Object.keys(subject);
if (keys.length !== 1) {
throw new Error('[match.js] Expected an object with a single key, given ' + JSON.stringify(subject));
}
var discriminator = keys[0];
return { discriminator: discriminator, body: subject[discriminator] };
});
exports.matcher = matcher;
exports.match = match;
exports.matchType = matchType;
exports.getSingleKey = getSingleKey;
exports.matchSingleKey = matchSingleKey;
exports.default = match;
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_ from 'lodash';\n\n\n// Utility\n\nconst getSingleKey = obj => {\n    if (!_.isPlainObject(obj)) {\n        throw new Error(`Error: expected object, given '${JSON.stringify(obj)}'`);\n    }\n    \n    const keys = Object.keys(obj);\n    if (keys.length !== 1) {\n        throw new Error(`Error: expected object with single key, given '${JSON.stringify(obj)}'`);\n    }\n    \n    const key = keys[0];\n    return { key, value: obj[key] };\n};\n\n\n// Common definitions\nconst defaultCase = Symbol('match.default');\nconst defs = {\n    case: (predicate, value) => [predicate, value],\n    otherwise: fn => [defaultCase, fn],\n    default: defaultCase,\n};\n\n\n// Match against an object, where each property is one case:\n//   match('x', { x: 1, y: 2 })\nconst matchAgainstObject = (discriminator, body, cases) => {\n    let matchedCase;\n    if (cases.hasOwnProperty(discriminator)) {\n        matchedCase = cases[discriminator];\n    } else if (cases.hasOwnProperty(defs.default)) {\n        matchedCase = cases[defs.default];\n    } else {\n        throw new Error(`[match.js] Unmatched case: ${JSON.stringify(discriminator)}`);\n    }\n    \n    // If the property is a function, pass the subject body\n    let result;\n    if (_.isFunction(matchedCase)) {\n        result = matchedCase(body);\n    } else {\n        result = matchedCase;\n    }\n    \n    return result;\n};\n\n// Match against a list of predicate functions:\n//   match({ type: 'x' }, [{ type: 'x' }, 1], [{ type: 'y' }, 2])\nconst matchAgainstPredicates = (discriminator, body, predicates) => {\n    for (let [predicate, predicateCase] of predicates) {\n        // If given an object\n        if (_.isObjectLike(predicate)) {\n            predicate = _.matches(predicate);\n        }\n        \n        let matchedCase;\n        if (predicate === discriminator) {\n            matchedCase = predicateCase;\n        } else if (_.isFunction(predicate) && predicate(discriminator) == true) {\n            // Note: using weak equality (==) for predicate check\n            matchedCase = predicateCase;\n        } else if (predicate === defs.default) {\n            matchedCase = predicateCase;\n        }\n        \n        if (matchedCase !== undefined) {\n            if (_.isFunction(matchedCase)) {\n                return matchedCase(body);\n            } else {\n                return matchedCase;\n            }\n        }\n    }\n    \n    // Fall-through: no match\n    throw new Error(`[match.js] Unmatched case: ${JSON.stringify(discriminator)}`);\n};\n\n\n// Create a new matcher using the given parser\nconst matcher = parseSubject => {\n    const matcher = (subject, ...args) => {\n        const { discriminator, body } = parseSubject(subject);\n        \n        let result;\n        if (args.length === 1 && _.isPlainObject(args[0])) {\n            const cases = args[0];\n            result = matchAgainstObject(discriminator, body, cases);\n        } else if (args.length === 1 && _.isArray(args[0])) {\n            const predicates = args[0];\n            result = matchAgainstPredicates(discriminator, body, predicates);\n        } else if (args.length >= 1) {\n            const predicates = args;\n            result = matchAgainstPredicates(discriminator, body, predicates);\n        } else {\n            throw new Error(`[match.js] Invalid arguments given`);\n        }\n        \n        return result;\n    };\n    \n    return Object.assign(matcher, defs);\n};\n\n\n// Specific matchers\n\n// Generic match. Accept any subject, and discriminate using the value itself\nconst match = matcher(subject => ({ discriminator: subject, body: subject }));\n\n// Match on objects with a `type` property\nconst matchType = matcher(subject => {\n    if (!_.isObjectLike(subject)) {\n        throw new Error(`[match.js] Expected an object, given ${JSON.stringify(subject)}`);\n    }\n    if (!subject.hasOwnProperty('type')) {\n        throw new Error(`[match.js] Missing 'type' property, given ${JSON.stringify(subject)}`);\n    }\n    \n    return { discriminator: subject.type, body: subject };\n});\n\nconst matchSingleKey = matcher(subject => {\n    if (!_.isObjectLike(subject)) {\n        throw new Error(`[match.js] Expected an object, given ${JSON.stringify(subject)}`);\n    }\n    \n    const keys = Object.keys(subject);\n    \n    if (keys.length !== 1) {\n        throw new Error(`[match.js] Expected an object with a single key, given ${JSON.stringify(subject)}`);\n    }\n    \n    const discriminator = keys[0];\n    return { discriminator, body: subject[discriminator] };\n});\n\nexport { matcher, match, matchType, getSingleKey, matchSingleKey };\nexport default match;\n"]}
+179
lib-es/match.js
var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
import _ from 'lodash';
// Utility
var getSingleKey = function getSingleKey(obj) {
if (!_.isPlainObject(obj)) {
throw new Error('Error: expected object, given \'' + JSON.stringify(obj) + '\'');
}
var keys = Object.keys(obj);
if (keys.length !== 1) {
throw new Error('Error: expected object with single key, given \'' + JSON.stringify(obj) + '\'');
}
var key = keys[0];
return { key: key, value: obj[key] };
};
// Common definitions
var defaultCase = Symbol('match.default');
var defs = {
case: function _case(predicate, value) {
return [predicate, value];
},
otherwise: function otherwise(fn) {
return [defaultCase, fn];
},
default: defaultCase
};
// Match against an object, where each property is one case:
// match('x', { x: 1, y: 2 })
var matchAgainstObject = function matchAgainstObject(discriminator, body, cases) {
var matchedCase = void 0;
if (cases.hasOwnProperty(discriminator)) {
matchedCase = cases[discriminator];
} else if (cases.hasOwnProperty(defs.default)) {
matchedCase = cases[defs.default];
} else {
throw new Error('[match.js] Unmatched case: ' + JSON.stringify(discriminator));
}
// If the property is a function, pass the subject body
var result = void 0;
if (_.isFunction(matchedCase)) {
result = matchedCase(body);
} else {
result = matchedCase;
}
return result;
};
// Match against a list of predicate functions:
// match({ type: 'x' }, [{ type: 'x' }, 1], [{ type: 'y' }, 2])
var matchAgainstPredicates = function matchAgainstPredicates(discriminator, body, predicates) {
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = predicates[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
var _step$value = _slicedToArray(_step.value, 2),
predicate = _step$value[0],
predicateCase = _step$value[1];
// If given an object
if (_.isObjectLike(predicate)) {
predicate = _.matches(predicate);
}
var matchedCase = void 0;
if (predicate === discriminator) {
matchedCase = predicateCase;
} else if (_.isFunction(predicate) && predicate(discriminator) == true) {
// Note: using weak equality (==) for predicate check
matchedCase = predicateCase;
} else if (predicate === defs.default) {
matchedCase = predicateCase;
}
if (matchedCase !== undefined) {
if (_.isFunction(matchedCase)) {
return matchedCase(body);
} else {
return matchedCase;
}
}
}
// Fall-through: no match
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
throw new Error('[match.js] Unmatched case: ' + JSON.stringify(discriminator));
};
// Create a new matcher using the given parser
var matcher = function matcher(parseSubject) {
var matcher = function matcher(subject) {
for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
args[_key - 1] = arguments[_key];
}
var _parseSubject = parseSubject(subject),
discriminator = _parseSubject.discriminator,
body = _parseSubject.body;
var result = void 0;
if (args.length === 1 && _.isPlainObject(args[0])) {
var cases = args[0];
result = matchAgainstObject(discriminator, body, cases);
} else if (args.length === 1 && _.isArray(args[0])) {
var predicates = args[0];
result = matchAgainstPredicates(discriminator, body, predicates);
} else if (args.length >= 1) {
var _predicates = args;
result = matchAgainstPredicates(discriminator, body, _predicates);
} else {
throw new Error('[match.js] Invalid arguments given');
}
return result;
};
return Object.assign(matcher, defs);
};
// Specific matchers
// Generic match. Accept any subject, and discriminate using the value itself
var match = matcher(function (subject) {
return { discriminator: subject, body: subject };
});
// Match on objects with a `type` property
var matchType = matcher(function (subject) {
if (!_.isObjectLike(subject)) {
throw new Error('[match.js] Expected an object, given ' + JSON.stringify(subject));
}
if (!subject.hasOwnProperty('type')) {
throw new Error('[match.js] Missing \'type\' property, given ' + JSON.stringify(subject));
}
return { discriminator: subject.type, body: subject };
});
var matchSingleKey = matcher(function (subject) {
if (!_.isObjectLike(subject)) {
throw new Error('[match.js] Expected an object, given ' + JSON.stringify(subject));
}
var keys = Object.keys(subject);
if (keys.length !== 1) {
throw new Error('[match.js] Expected an object with a single key, given ' + JSON.stringify(subject));
}
var discriminator = keys[0];
return { discriminator: discriminator, body: subject[discriminator] };
});
export { matcher, match, matchType, getSingleKey, matchSingleKey };
export default match;
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_ from 'lodash';\n\n\n// Utility\n\nconst getSingleKey = obj => {\n    if (!_.isPlainObject(obj)) {\n        throw new Error(`Error: expected object, given '${JSON.stringify(obj)}'`);\n    }\n    \n    const keys = Object.keys(obj);\n    if (keys.length !== 1) {\n        throw new Error(`Error: expected object with single key, given '${JSON.stringify(obj)}'`);\n    }\n    \n    const key = keys[0];\n    return { key, value: obj[key] };\n};\n\n\n// Common definitions\nconst defaultCase = Symbol('match.default');\nconst defs = {\n    case: (predicate, value) => [predicate, value],\n    otherwise: fn => [defaultCase, fn],\n    default: defaultCase,\n};\n\n\n// Match against an object, where each property is one case:\n//   match('x', { x: 1, y: 2 })\nconst matchAgainstObject = (discriminator, body, cases) => {\n    let matchedCase;\n    if (cases.hasOwnProperty(discriminator)) {\n        matchedCase = cases[discriminator];\n    } else if (cases.hasOwnProperty(defs.default)) {\n        matchedCase = cases[defs.default];\n    } else {\n        throw new Error(`[match.js] Unmatched case: ${JSON.stringify(discriminator)}`);\n    }\n    \n    // If the property is a function, pass the subject body\n    let result;\n    if (_.isFunction(matchedCase)) {\n        result = matchedCase(body);\n    } else {\n        result = matchedCase;\n    }\n    \n    return result;\n};\n\n// Match against a list of predicate functions:\n//   match({ type: 'x' }, [{ type: 'x' }, 1], [{ type: 'y' }, 2])\nconst matchAgainstPredicates = (discriminator, body, predicates) => {\n    for (let [predicate, predicateCase] of predicates) {\n        // If given an object\n        if (_.isObjectLike(predicate)) {\n            predicate = _.matches(predicate);\n        }\n        \n        let matchedCase;\n        if (predicate === discriminator) {\n            matchedCase = predicateCase;\n        } else if (_.isFunction(predicate) && predicate(discriminator) == true) {\n            // Note: using weak equality (==) for predicate check\n            matchedCase = predicateCase;\n        } else if (predicate === defs.default) {\n            matchedCase = predicateCase;\n        }\n        \n        if (matchedCase !== undefined) {\n            if (_.isFunction(matchedCase)) {\n                return matchedCase(body);\n            } else {\n                return matchedCase;\n            }\n        }\n    }\n    \n    // Fall-through: no match\n    throw new Error(`[match.js] Unmatched case: ${JSON.stringify(discriminator)}`);\n};\n\n\n// Create a new matcher using the given parser\nconst matcher = parseSubject => {\n    const matcher = (subject, ...args) => {\n        const { discriminator, body } = parseSubject(subject);\n        \n        let result;\n        if (args.length === 1 && _.isPlainObject(args[0])) {\n            const cases = args[0];\n            result = matchAgainstObject(discriminator, body, cases);\n        } else if (args.length === 1 && _.isArray(args[0])) {\n            const predicates = args[0];\n            result = matchAgainstPredicates(discriminator, body, predicates);\n        } else if (args.length >= 1) {\n            const predicates = args;\n            result = matchAgainstPredicates(discriminator, body, predicates);\n        } else {\n            throw new Error(`[match.js] Invalid arguments given`);\n        }\n        \n        return result;\n    };\n    \n    return Object.assign(matcher, defs);\n};\n\n\n// Specific matchers\n\n// Generic match. Accept any subject, and discriminate using the value itself\nconst match = matcher(subject => ({ discriminator: subject, body: subject }));\n\n// Match on objects with a `type` property\nconst matchType = matcher(subject => {\n    if (!_.isObjectLike(subject)) {\n        throw new Error(`[match.js] Expected an object, given ${JSON.stringify(subject)}`);\n    }\n    if (!subject.hasOwnProperty('type')) {\n        throw new Error(`[match.js] Missing 'type' property, given ${JSON.stringify(subject)}`);\n    }\n    \n    return { discriminator: subject.type, body: subject };\n});\n\nconst matchSingleKey = matcher(subject => {\n    if (!_.isObjectLike(subject)) {\n        throw new Error(`[match.js] Expected an object, given ${JSON.stringify(subject)}`);\n    }\n    \n    const keys = Object.keys(subject);\n    \n    if (keys.length !== 1) {\n        throw new Error(`[match.js] Expected an object with a single key, given ${JSON.stringify(subject)}`);\n    }\n    \n    const discriminator = keys[0];\n    return { discriminator, body: subject[discriminator] };\n});\n\nexport { matcher, match, matchType, getSingleKey, matchSingleKey };\nexport default match;\n"]}
+3
-2
package.json
{
"name": "@mkrause/match",
"version": "1.0.15",
"version": "1.0.16",
"description": "Case matching utility.",

@@ -16,3 +16,4 @@ "author": "mkrause",

"src/",
"lib/",
"lib-cjs/",
"lib-es/",
"tests/"

@@ -19,0 +20,0 @@ ],