git ssb - furst · wanderer🌟/referenceMap@59a99b6e

wanderer committed on 7/24/2017, 2:02:08 AM

index.jsView
		@@ -1,0 +1,47 @@
	1 …	+module.exports = class ReferanceMap {
	2 …	+ /**
	3 …	+ * Handle mapping arbitary JS object to ints
	4 …	+ */
	5 …	+ constructor () {
	6 …	+ this._map = []
	7 …	+ }
	8 …	+
	9 …	+ /**
	10 …	+ * Adds an object to the referance map returning an int to be used as a
	11 …	+ * referance
	12 …	+ * @param {*} obj
	13 …	+ * @return {integer}
	14 …	+ */
	15 …	+ add (obj) {
	16 …	+ return this._map.push(obj) - 1
	17 …	+ }
	18 …	+
	19 …	+ /**
	20 …	+ * gets a POJO given a refernce as an int
	21 …	+ * @param {integer} ref
	22 …	+ * @return {*}
	23 …	+ */
	24 …	+ get (ref) {
	25 …	+ const obj = this._map[ref]
	26 …	+ if (!obj) {
	27 …	+ throw new Error('invalid referance')
	28 …	+ }
	29 …	+ return obj
	30 …	+ }
	31 …	+
	32 …	+ /**
	33 …	+ * deletes an object given a referance as an int
	34 …	+ * @param {integer}
	35 …	+ * @return {boolean} whether or not the object was deleted
	36 …	+ */
	37 …	+ delete (ref) {
	38 …	+ delete this._map[ref]
	39 …	+ }
	40 …	+
	41 …	+ /**
	42 …	+ * clears the referance map of a objects
	43 …	+ */
	44 …	+ clear () {
	45 …	+ this._map = []
	46 …	+ }
	47 …	+}

package.jsonView
		@@ -1,0 +1,25 @@
	1 …	+{
	2 …	+ "name": "referanceMap",
	3 …	+ "version": "0.0.0",
	4 …	+ "description": "This is a simple determinstic map that maps POJOs to an integer",
	5 …	+ "main": "index.js",
	6 …	+ "scripts": {
	7 …	+ "coverage": "node --expose-wasm --harmony ./node_modules/istanbul/lib/cli.js cover ./tests/index.js",
	8 …	+ "coveralls": "npm run coverage && coveralls <coverage/lcov.info",
	9 …	+ "lint": "standard",
	10 …	+ "test": "node --expose-wasm --harmony ./tests/index.js"
	11 …	+ },
	12 …	+ "author": "mjbecze <mjbecze@gmail.com>",
	13 …	+ "license": "MPL-2.0",
	14 …	+ "standard": {
	15 …	+ "globals": [
	16 …	+ "WebAssembly"
	17 …	+ ]
	18 …	+ },
	19 …	+ "keywords": ["map"],
	20 …	+ "devDependencies": {
	21 …	+ "istanbul": "^1.1.0-alpha.1",
	22 …	+ "standard": "^10.0.0",
	23 …	+ "tape": "^4.6.3"
	24 …	+ }
	25 …	+}

tests/index.jsView
		@@ -1,0 +1,33 @@
	1 …	+const tape = require('tape')
	2 …	+const ReferanceMap = require('../index.js')
	3 …	+
	4 …	+tape('referance mapping', t => {
	5 …	+ t.plan(6)
	6 …	+ const referanceMap = new ReferanceMap()
	7 …	+ const obj1 = {}
	8 …	+ const obj2 = {}
	9 …	+ const ref1 = referanceMap.add(obj1)
	10 …	+ const ref2 = referanceMap.add(obj2)
	11 …	+ t.equals(ref1, 0, 'should produce correct refs')
	12 …	+ t.equals(ref2, 1, 'should produce correct refs')
	13 …	+
	14 …	+ const foundObj1 = referanceMap.get(ref1)
	15 …	+ const foundObj2 = referanceMap.get(ref2)
	16 …	+
	17 …	+ t.equals(foundObj1, obj1, 'should get the correct object')
	18 …	+ t.equals(foundObj2, obj2, 'should get the correct object')
	19 …	+
	20 …	+ referanceMap.delete(ref1)
	21 …	+ try {
	22 …	+ referanceMap.get(ref1)
	23 …	+ } catch (e) {
	24 …	+ t.true(true, 'should delete refances')
	25 …	+ }
	26 …	+
	27 …	+ referanceMap.clear()
	28 …	+ try {
	29 …	+ referanceMap.get(ref2)
	30 …	+ } catch (e) {
	31 …	+ t.true(true, 'should clear refances')
	32 …	+ }
	33 …	+})
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