feat(value-matcher): new package (#30)

package.json

@@ -30,6 +30,7 @@
     "testRegex": "\\.spec\\.js$",
     "transform": {
       "complex-matcher/.+\\.jsx?$": "babel-7-jest",
+      "value-matcher/.+\\.jsx?$": "babel-7-jest",
       "xo-cli/.+\\.jsx?$": "babel-7-jest",
       "\\.jsx?$": "babel-jest"
     }

packages/value-matcher/.babelrc.js

@@ -0,0 +1,27 @@
+const { NODE_ENV = 'development' } = process.env
+const __PROD__ = NODE_ENV === 'production'
+const __TEST__ = NODE_ENV === 'test'
+
+module.exports = {
+  comments: !__PROD__,
+  compact: __PROD__,
+  ignore: __TEST__ ? undefined : [ /\.spec\.js$/ ],
+  presets: [
+    [
+      '@babel/env',
+      {
+        debug: !__TEST__,
+        loose: true,
+        shippedProposals: true,
+        targets: __PROD__
+          ? {
+            browsers: '>2%',
+            node: '4',
+          }
+          : { node: 'current' },
+        useBuiltIns: 'usage',
+      },
+    ],
+    '@babel/flow',
+  ],
+}

packages/value-matcher/.npmignore

@@ -0,0 +1,24 @@
+/benchmark/
+/benchmarks/
+*.bench.js
+*.bench.js.map
+
+/examples/
+example.js
+example.js.map
+*.example.js
+*.example.js.map
+
+/fixture/
+/fixtures/
+*.fixture.js
+*.fixture.js.map
+*.fixtures.js
+*.fixtures.js.map
+
+/test/
+/tests/
+*.spec.js
+*.spec.js.map
+
+__snapshots__/

packages/value-matcher/README.md

@@ -0,0 +1,66 @@
+# value-matcher [![Build Status](https://travis-ci.org/vatefr/xen-orchestra.png?branch=master)](https://travis-ci.org/vatefr/xen-orchestra)
+
+> ${pkg.description}
+
+## Install
+
+Installation of the [npm package](https://npmjs.org/package/value-matcher):
+
+```
+> npm install --save value-matcher
+```
+
+## Usage
+
+```js
+import { createPredicate } from 'value-matcher'
+
+[
+  { user: 'sam', age: 65, active: false },
+  { user: 'barney', age: 36, active: true },
+  { user: 'fred', age: 40, active: false },
+].filter(createPredicate({
+  __or: [
+    { user: 'sam' },
+    { active: true },
+  ],
+}))
+// [
+//   { user: 'sam', age: 65, active: false },
+//   { user: 'barney', age: 36, active: true },
+// ]
+```
+
+## Development
+
+```
+# Install dependencies
+> yarn
+
+# Run the tests
+> yarn test
+
+# Continuously compile
+> yarn dev
+
+# Continuously run the tests
+> yarn dev-test
+
+# Build for production (automatically called by npm install)
+> yarn build
+```
+
+## Contributions
+
+Contributions are *very* welcomed, either on the documentation or on
+the code.
+
+You may:
+
+- report any [issue](https://github.com/vatesfr/xo-web/issues)
+  you've encountered;
+- fork and create a pull request.
+
+## License
+
+ISC © [Vates SAS](https://vates.fr)

packages/value-matcher/package.json

@@ -0,0 +1,45 @@
+{
+  "private": true,
+  "name": "value-matcher",
+  "version": "0.0.0",
+  "license": "ISC",
+  "description": "",
+  "keywords": [],
+  "homepage": "https://github.com/vatesfr/xen-orchestra/tree/master/packages/value-matcher",
+  "bugs": "https://github.com/vatesfr/xo-web/issues",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/vatesfr/xen-orchestra.git"
+  },
+  "author": {
+    "name": "Julien Fontanet",
+    "email": "julien.fontanet@isonoe.net"
+  },
+  "preferGlobal": false,
+  "main": "dist/",
+  "bin": {},
+  "files": [
+    "dist/"
+  ],
+  "engines": {
+    "node": ">=4"
+  },
+  "dependencies": {
+    "@babel/polyfill": "^7.0.0-beta.36"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.0.0-beta.36",
+    "@babel/core": "^7.0.0-beta.36",
+    "@babel/preset-env": "^7.0.0-beta.36",
+    "@babel/preset-flow": "^7.0.0-beta.36",
+    "cross-env": "^5.1.3",
+    "rimraf": "^2.6.2"
+  },
+  "scripts": {
+    "build": "cross-env NODE_ENV=production babel --source-maps --out-dir=dist/ src/",
+    "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
+    "prebuild": "rimraf dist/",
+    "predev": "yarn run prebuild",
+    "prepublishOnly": "yarn run build"
+  }
+}

packages/value-matcher/src/index.js

@@ -0,0 +1,63 @@
+// @flow
+
+// eslint-disable-next-line no-use-before-define
+export type Pattern = OrPattern | NotPattern | ObjectPattern | ArrayPattern | ValuePattern
+
+// one of the pattern must match
+type OrPattern = {| __or: Array<Pattern> |}
+
+// the pattern must not  match
+type NotPattern = {| __not: Pattern |}
+
+// value is an object with properties matching the patterns
+type ObjectPattern = { [string]: Pattern }
+
+// value is an array and each patterns must match a different item
+type ArrayPattern = Array<Pattern>
+
+// value equals the pattern
+type ValuePattern = bool | number | string
+
+const match = (pattern: Pattern, value: any) => {
+  if (Array.isArray(pattern)) {
+    return Array.isArray(value) && pattern.every((subpattern, i) =>
+      // FIXME: subpatterns should match different subvalues
+      value.some(subvalue => match(subpattern, subvalue))
+    )
+  }
+
+  if (pattern !== null && typeof pattern === 'object') {
+    const keys = Object.keys(pattern)
+    const { length } = keys
+
+    if (length === 1) {
+      const [ key ] = keys
+      if (key === '__or') {
+        const orPattern: OrPattern = (pattern: any)
+        return orPattern.__or.some(subpattern => match(subpattern, value))
+      }
+      if (key === '__not') {
+        const notPattern: NotPattern = (pattern: any)
+        return !match(notPattern.__not, value)
+      }
+    }
+
+    if (value === null || typeof value !== 'object') {
+      return false
+    }
+
+    const objectPattern: ObjectPattern = (pattern: any)
+    for (let i = 0; i < length; ++i) {
+      const key = keys[i]
+      const subvalue = value[key]
+      if (subvalue === undefined || !match(objectPattern[key], subvalue)) {
+        return false
+      }
+    }
+    return true
+  }
+
+  return pattern === value
+}
+
+export const createPredicate = (pattern: Pattern) => (value: any) => match(pattern, value)