Additional feat, chore, and fixes

README.md

@@ -1,73 +1,75 @@
 # packageurl-js
 
-### Installing:
+### Installing
+
 To install `packageurl-js` in your project, simply run:
-```
+```bash
 npm install packageurl-js
 ```
 
 This command will download the `packageurl-js` npm package for use in your application.
 
-### Local Development:
-Clone the `packageurl-js` repo and `cd` into the directory. 
+### Local Development
 
-Then run: 
-```
+Clone the `packageurl-js` repo and `cd` into the directory.
+
+Then run:
+```bash
 npm install
 ```
 
 ### Testing
-To run the test suite: 
-```
+
+To run the test suite:
+```bash
 npm test
 ```
 
 ### Usage Examples
 
-#### Import ES6 Module
+#### Importing
 
+As an ES6 module
+```js
+import { PackageURL } from 'packageurl-js'
 ```
-import { PackageURL } from 'packageurl-js';
-```
-
-#### Import CommonJs Module
 
-```
-const { PackageURL } = require('packageurl-js');
+As a CommonJS module
+```js
+const { PackageURL } = require('packageurl-js')
 ```
 
-#### Parsing from a string
+#### Parsing
 
-```
-const pkg = PackageURL.fromString('pkg:maven/org.springframework.integration/spring-integration-jms@5.5.5');
-console.log(pkg);
+```js
+const purlStr = 'pkg:maven/org.springframework.integration/spring-integration-jms@5.5.5'
+console.log(PackageURL.fromString(purlStr))
+console.log(new PackageURL(...PackageURL.parseString(purlStr)))
 ```
 
-=>
+will both log
 
 ```
 PackageURL {
-  type: 'maven',
-  name: 'spring-integration-jms',
-  namespace: 'org.springframework.integration',
-  version: '5.5.5',
-  qualifiers: null,
-  subpath: null
+    type: 'maven',
+    name: 'spring-integration-jms',
+    namespace: 'org.springframework.integration',
+    version: '5.5.5',
+    qualifiers: undefined,
+    subpath: undefined
 }
 ```
 
 #### Constructing
 
-```
+```js
 const pkg = new PackageURL(
     'maven',
     'org.springframework.integration',
     'spring-integration-jms',
-    '5.5.5',
-    undefined,
-    undefined);
-
-console.log(pkg.toString());
+    '5.5.5'
+)
+console.log(pkg.toString())
 ```
 
 =>
@@ -78,16 +80,73 @@ pkg:maven/org.springframework.integration/spring-integration-jms@5.5.5
 
 #### Error Handling
 
-```
+```js
 try {
-    PackageURL.fromString('not-a-purl');
-} catch(ex) {
-    console.error(ex.message);
+    PackageURL.fromString('not-a-purl')
+} catch (e) {
+    console.error(e.message)
 }
 ```
 
 =>
 
 ```
-purl is missing the required "pkg" scheme component.
-```
+Invalid purl: missing required "pkg" scheme component
+```
+
+#### Helper Objects
+
+Helpers for encoding, normalizing, and validating purl components and types can
+be imported directly from the module or found on the PackageURL class as static
+properties.
+```js
+import {
+    PackageURL,
+    PurlComponent,
+    PurlType
+} from 'packageurl-js'
+
+PurlComponent === PackageURL.Component // => true
+PurlType === PackageURL.Type // => true
+```
+
+#### PurlComponent
+
+Contains the following properties each with their own `encode`, `normalize`,
+and `validate` methods, e.g. `PurlComponent.name.validate(nameStr)`:
+  - type
+  - namespace
+  - name
+  - version
+  - qualifiers
+  - qualifierKey
+  - qualifierValue
+  - subpath
+
+#### PurlType
+
+Contains the following properties each with their own `normalize`, and `validate`
+methods, e.g. `PurlType.npm.validate(purlObj)`:
+  - alpm
+  - apk
+  - bitbucket
+  - bitnami
+  - composer
+  - conan
+  - cran
+  - deb
+  - github
+  - gitlab
+  - golang
+  - hex
+  - huggingface
+  - luarocks
+  - maven
+  - mlflow
+  - npm
+  - oci
+  - pub
+  - pypi
+  - qpkg
+  - rpm
+  - swift

index.js

@@ -22,15 +22,15 @@ SOFTWARE.
 'use strict'
 
 const {
-  Component,
-  KnownQualifierNames,
   PackageURL,
-  Type
+  PurlComponent,
+  PurlQualifierNames,
+  PurlType
 } = require('./src/package-url')
 
 module.exports = {
-  Component,
-  KnownQualifierNames,
   PackageURL,
-  Type
+  PurlComponent,
+  PurlQualifierNames,
+  PurlType
 }

src/constants.js

@@ -0,0 +1,7 @@
+'use strict'
+
+const LOOP_SENTINEL = 1_000_000
+
+module.exports = {
+    LOOP_SENTINEL
+}

src/encode.js

@@ -0,0 +1,71 @@
+'use strict'
+
+const { isObject } = require('./objects')
+const { isNonEmptyString } = require('./strings')
+
+const reusedSearchParams = new URLSearchParams()
+const reusedSearchParamKey = '_'
+const reusedSearchParamOffset = 2 // '_='.length
+
+const { encodeURIComponent } = globalThis
+
+function encodeNamespace(namespace) {
+    return isNonEmptyString(namespace)
+        ? encodeURIComponent(namespace)
+              .replace(/%3A/g, ':')
+              .replace(/%2F/g, '/')
+        : ''
+}
+
+function encodeQualifierParam(param) {
+    if (isNonEmptyString(param)) {
+        // Param key and value are encoded with `percentEncodeSet` of
+        // 'application/x-www-form-urlencoded' and `spaceAsPlus` of `true`.
+        // https://url.spec.whatwg.org/#urlencoded-serializing
+        reusedSearchParams.set(reusedSearchParamKey, param)
+        return replacePlusSignWithPercentEncodedSpace(
+            reusedSearchParams.toString().slice(reusedSearchParamOffset)
+        )
+    }
+    return ''
+}
+
+function encodeQualifiers(qualifiers) {
+    if (isObject(qualifiers)) {
+        // Sort this list of qualifier strings lexicographically.
+        const qualifiersKeys = Object.keys(qualifiers).sort()
+        const searchParams = new URLSearchParams()
+        for (let i = 0, { length } = qualifiersKeys; i < length; i += 1) {
+            const key = qualifiersKeys[i]
+            searchParams.set(key, qualifiers[key])
+        }
+        return replacePlusSignWithPercentEncodedSpace(searchParams.toString())
+    }
+    return ''
+}
+
+function encodeSubpath(subpath) {
+    return isNonEmptyString(subpath)
+        ? encodeURIComponent(subpath).replace(/%2F/g, '/')
+        : ''
+}
+
+function encodeVersion(version) {
+    return isNonEmptyString(version)
+        ? encodeURIComponent(version).replace(/%3A/g, ':').replace(/%2B/g, '+')
+        : ''
+}
+
+function replacePlusSignWithPercentEncodedSpace(str) {
+    // Convert plus signs to %20 for better portability.
+    return str.replace(/\+/g, '%20')
+}
+
+module.exports = {
+    encodeNamespace,
+    encodeVersion,
+    encodeQualifiers,
+    encodeQualifierParam,
+    encodeSubpath,
+    encodeURIComponent
+}

src/helpers.js

@@ -0,0 +1,32 @@
+'use strict'
+
+function createHelpersNamespaceObject(helpers, options_ = {}) {
+    const { comparator, ...defaults } = { __proto__: null, ...options_ }
+    const helperNames = Object.keys(helpers).sort()
+    const propNames = [
+        ...new Set([...Object.values(helpers)].map(Object.keys).flat())
+    ].sort(comparator)
+    const nsObject = Object.create(null)
+    for (let i = 0, { length } = propNames; i < length; i += 1) {
+        const propName = propNames[i]
+        const helpersForProp = Object.create(null)
+        for (
+            let j = 0, { length: length_j } = helperNames;
+            j < length_j;
+            j += 1
+        ) {
+            const helperName = helperNames[j]
+            const helperValue =
+                helpers[helperName][propName] ?? defaults[helperName]
+            if (helperValue !== undefined) {
+                helpersForProp[helperName] = helperValue
+            }
+        }
+        nsObject[propName] = helpersForProp
+    }
+    return nsObject
+}
+
+module.exports = {
+    createHelpersNamespaceObject
+}

src/lang.js

@@ -0,0 +1,13 @@
+'use strict'
+
+function isNullishOrEmptyString(value) {
+    return (
+        value === null ||
+        value === undefined ||
+        (typeof value === 'string' && value.length === 0)
+    )
+}
+
+module.exports = {
+    isNullishOrEmptyString
+}