implemented basic client-server communication

node_modules/semver/bin/semver.js

@@ -0,0 +1,197 @@
+#!/usr/bin/env node
+// Standalone semver comparison program.
+// Exits successfully and prints matching version(s) if
+// any supplied version is valid and passes all tests.
+
+const argv = process.argv.slice(2)
+
+let versions = []
+
+const range = []
+
+let inc = null
+
+const version = require('../package.json').version
+
+let loose = false
+
+let includePrerelease = false
+
+let coerce = false
+
+let rtl = false
+
+let identifier
+
+let identifierBase
+
+const semver = require('../')
+const parseOptions = require('../internal/parse-options')
+
+let reverse = false
+
+let options = {}
+
+const main = () => {
+  if (!argv.length) {
+    return help()
+  }
+  while (argv.length) {
+    let a = argv.shift()
+    const indexOfEqualSign = a.indexOf('=')
+    if (indexOfEqualSign !== -1) {
+      const value = a.slice(indexOfEqualSign + 1)
+      a = a.slice(0, indexOfEqualSign)
+      argv.unshift(value)
+    }
+    switch (a) {
+      case '-rv': case '-rev': case '--rev': case '--reverse':
+        reverse = true
+        break
+      case '-l': case '--loose':
+        loose = true
+        break
+      case '-p': case '--include-prerelease':
+        includePrerelease = true
+        break
+      case '-v': case '--version':
+        versions.push(argv.shift())
+        break
+      case '-i': case '--inc': case '--increment':
+        switch (argv[0]) {
+          case 'major': case 'minor': case 'patch': case 'prerelease':
+          case 'premajor': case 'preminor': case 'prepatch':
+            inc = argv.shift()
+            break
+          default:
+            inc = 'patch'
+            break
+        }
+        break
+      case '--preid':
+        identifier = argv.shift()
+        break
+      case '-r': case '--range':
+        range.push(argv.shift())
+        break
+      case '-n':
+        identifierBase = argv.shift()
+        if (identifierBase === 'false') {
+          identifierBase = false
+        }
+        break
+      case '-c': case '--coerce':
+        coerce = true
+        break
+      case '--rtl':
+        rtl = true
+        break
+      case '--ltr':
+        rtl = false
+        break
+      case '-h': case '--help': case '-?':
+        return help()
+      default:
+        versions.push(a)
+        break
+    }
+  }
+
+  options = parseOptions({ loose, includePrerelease, rtl })
+
+  versions = versions.map((v) => {
+    return coerce ? (semver.coerce(v, options) || { version: v }).version : v
+  }).filter((v) => {
+    return semver.valid(v)
+  })
+  if (!versions.length) {
+    return fail()
+  }
+  if (inc && (versions.length !== 1 || range.length)) {
+    return failInc()
+  }
+
+  for (let i = 0, l = range.length; i < l; i++) {
+    versions = versions.filter((v) => {
+      return semver.satisfies(v, range[i], options)
+    })
+    if (!versions.length) {
+      return fail()
+    }
+  }
+  return success(versions)
+}
+
+const failInc = () => {
+  console.error('--inc can only be used on a single version with no range')
+  fail()
+}
+
+const fail = () => process.exit(1)
+
+const success = () => {
+  const compare = reverse ? 'rcompare' : 'compare'
+  versions.sort((a, b) => {
+    return semver[compare](a, b, options)
+  }).map((v) => {
+    return semver.clean(v, options)
+  }).map((v) => {
+    return inc ? semver.inc(v, inc, options, identifier, identifierBase) : v
+  }).forEach((v, i, _) => {
+    console.log(v)
+  })
+}
+
+const help = () => console.log(
+`SemVer ${version}
+
+A JavaScript implementation of the https://semver.org/ specification
+Copyright Isaac Z. Schlueter
+
+Usage: semver [options] <version> [<version> [...]]
+Prints valid versions sorted by SemVer precedence
+
+Options:
+-r --range <range>
+        Print versions that match the specified range.
+
+-i --increment [<level>]
+        Increment a version by the specified level.  Level can
+        be one of: major, minor, patch, premajor, preminor,
+        prepatch, or prerelease.  Default level is 'patch'.
+        Only one version may be specified.
+
+--preid <identifier>
+        Identifier to be used to prefix premajor, preminor,
+        prepatch or prerelease version increments.
+
+-l --loose
+        Interpret versions and ranges loosely
+
+-p --include-prerelease
+        Always include prerelease versions in range matching
+
+-c --coerce
+        Coerce a string into SemVer if possible
+        (does not imply --loose)
+
+--rtl
+        Coerce version strings right to left
+
+--ltr
+        Coerce version strings left to right (default)
+
+-n <base>
+        Base number to be used for the prerelease identifier.
+        Can be either 0 or 1, or false to omit the number altogether.
+        Defaults to 0.
+
+Program exits successfully if any valid version satisfies
+all supplied ranges, and prints all satisfying versions.
+
+If no satisfying versions are found, then exits failure.
+
+Versions are printed in ascending order, so supplying
+multiple versions to the utility will just sort them.`)
+
+main()