Added version coercion to the module and CLI.

bin/semver

@@ -12,6 +12,7 @@ var argv = process.argv.slice(2)
   , inc = null
   , version = require("../package.json").version
   , loose = false
+  , coerce = false
   , identifier = undefined
   , semver = require("../semver")
   , reverse = false
@@ -54,6 +55,9 @@ function main () {
       case "-r": case "--range":
         range.push(argv.shift())
         break
+      case "-c": case "--coerce":
+        coerce = true
+        break
       case "-h": case "--help": case "-?":
         return help()
       default:
@@ -62,8 +66,10 @@ function main () {
     }
   }
 
-  versions = versions.filter(function (v) {
-    return semver.valid(v, loose)
+  versions = versions.map(function (v) {
+    return coerce ? (semver.coerce(v) || {version: v}).version : v
+  }).filter(function (v) {
+    return semver.valid(v)
   })
   if (!versions.length) return fail()
   if (inc && (versions.length !== 1 || range.length))
@@ -122,6 +128,10 @@ function help () {
               ,"-l --loose"
               ,"        Interpret versions and ranges loosely"
               ,""
+              ,"-c --coerce"
+              ,"        Coerce a string into SemVer if possible"
+              ,"        (does not imply --loose)"
+              ,""
               ,"Program exits successfully if any valid version satisfies"
               ,"all supplied ranges, and prints all satisfying versions."
               ,""

semver.js

@@ -1294,3 +1294,24 @@ function intersects(r1, r2, loose) {
   r2 = new Range(r2, loose)
   return r1.intersects(r2)
 }
+
+exports.coerce = coerce;
+function coerce(version) {
+  if (version instanceof SemVer)
+    return version
+
+  if (typeof version !== 'string')
+    return null
+
+  if (version.length > MAX_LENGTH)
+    return null;
+
+  var match = version.match(/([vV]?\d+(?:[.]\d+)*)/)
+  if (match == null)
+    return null
+
+  var parts = match[0].split(/[.]/)
+  var semver = ['0', '0', '0'].map(function (ph, idx) { return parts[idx] || ph } ).join('.')
+
+  return parse(semver)
+}

test/coerce.js

@@ -0,0 +1,72 @@
+var tap = require('tap');
+var test = tap.test;
+var semver = require('../semver.js');
+var coerce = semver.coerce;
+
+test('\ncoerce tests', function(t) {
+  var tooLong = '123' + '.1'.repeat(127);
+  var justRight = '12' + '.1'.repeat(127);
+
+  // Expected to be null (cannot be coerced).
+  [
+    null,
+    {version: '1.2.3'},
+    function () { return '1.2.3'; },
+    '',
+    '.',
+    tooLong
+  ].forEach(function (input) {
+    var msg = 'coerce(' + input + ') should be null'
+    t.same(coerce(input), null, msg)
+  });
+
+  // Expected to be the same.
+  [
+    [semver.parse('1.2.3'), '1.2.3'],
+    ['.1', '1.0.0'],
+    ['.1.', '1.0.0'],
+    ['..1', '1.0.0'],
+    ['.1.1', '1.1.0'],
+    ['1.', '1.0.0'],
+    ['1.0', '1.0.0'],
+    ['1.0.0', '1.0.0'],
+    ['0', '0.0.0'],
+    ['0.0', '0.0.0'],
+    ['0.0.0', '0.0.0'],
+    ['0.1', '0.1.0'],
+    ['0.0.1', '0.0.1'],
+    ['0.1.1', '0.1.1'],
+    ['1', '1.0.0'],
+    ['1.2', '1.2.0'],
+    ['1.2.3', '1.2.3'],
+    ['1.2.3.4', '1.2.3'],
+    ['13', '13.0.0'],
+    ['35.12', '35.12.0'],
+    ['35.12.18', '35.12.18'],
+    ['35.12.18.24', '35.12.18'],
+    ['v1', '1.0.0'],
+    ['v1.2', '1.2.0'],
+    ['v1.2.3', '1.2.3'],
+    ['v1.2.3.4', '1.2.3'],
+    ['1 0', '1.0.0'],
+    ['1 1', '1.0.0'],
+    ['1.1 1', '1.1.0'],
+    ['1.1-1', '1.1.0'],
+    ['1.1-1', '1.1.0'],
+    ['a1', '1.0.0'],
+    ['a1a', '1.0.0'],
+    ['1a', '1.0.0'],
+    ['version 1', '1.0.0'],
+    ['version1', '1.0.0'],
+    ['version1.0', '1.0.0'],
+    ['version1.1', '1.1.0'],
+    [justRight, '12.1.1']
+  ].forEach(function (tuple) {
+    var input = tuple[0]
+    var expected = tuple[1]
+    var msg = 'coerce(' + input + ') should become ' + expected
+    t.same((coerce(input) || {}).version, expected, msg)
+  });
+
+  t.done();
+});