add semantic versioning (semver.org) validator

README.md

@@ -400,6 +400,12 @@ Validates MAC addresses.
 Examples:
 - `mac()`: Allows any valid MAC address
 
+### SemVer (Semantic Versioning) - `semver()`
+Validates [Semantic Versioning](https://semver.org/) strings.
+
+Examples:
+- `semver()`: Allows any valid SemVer string
+
 ### Any - `any([validators])`
 Validates against a union of types. Use when a node **must** contain **one and only one** of several types. It is valid
 if at least one of the listed validators is valid. If no validators are given, accept any value.

yamale/validators/tests/test_validate.py

@@ -144,3 +144,83 @@ def test_mac():
     assert not v.is_valid("ab:cd:ef:12:34:56:78")
     assert not v.is_valid("abcdefghijkl")
     assert not v.is_valid("1234567890ax")
+
+
+def test_semver():
+    """
+    - https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
+    - https://regex101.com/r/Ly7O1x/3/
+    """
+    v = val.SemVer()
+
+    assert v.is_valid("0.0.4")
+    assert v.is_valid("1.2.3")
+    assert v.is_valid("10.20.30")
+    assert v.is_valid("1.1.2-prerelease+meta")
+    assert v.is_valid("1.1.2+meta")
+    assert v.is_valid("1.1.2+meta-valid")
+    assert v.is_valid("1.0.0-alpha")
+    assert v.is_valid("1.0.0-beta")
+    assert v.is_valid("1.0.0-alpha.beta")
+    assert v.is_valid("1.0.0-alpha.beta.1")
+    assert v.is_valid("1.0.0-alpha.1")
+    assert v.is_valid("1.0.0-alpha0.valid")
+    assert v.is_valid("1.0.0-alpha.0valid")
+    assert v.is_valid("1.0.0-alpha-a.b-c-somethinglong+build.1-aef.1-its-okay")
+    assert v.is_valid("1.0.0-rc.1+build.1")
+    assert v.is_valid("2.0.0-rc.1+build.123")
+    assert v.is_valid("1.2.3-beta")
+    assert v.is_valid("10.2.3-DEV-SNAPSHOT")
+    assert v.is_valid("1.2.3-SNAPSHOT-123")
+    assert v.is_valid("1.0.0")
+    assert v.is_valid("2.0.0")
+    assert v.is_valid("1.1.7")
+    assert v.is_valid("2.0.0+build.1848")
+    assert v.is_valid("2.0.1-alpha.1227")
+    assert v.is_valid("1.0.0-alpha+beta")
+    assert v.is_valid("1.2.3----RC-SNAPSHOT.12.9.1--.12+788")
+    assert v.is_valid("1.2.3----R-S.12.9.1--.12+meta")
+    assert v.is_valid("1.2.3----RC-SNAPSHOT.12.9.1--.12")
+    assert v.is_valid("1.0.0+0.build.1-rc.10000aaa-kk-0.1")
+    assert v.is_valid("99999999999999999999999.999999999999999999.99999999999999999")
+    assert v.is_valid("1.0.0-0A.is.legal")
+
+    assert not v.is_valid("1")
+    assert not v.is_valid("1.2")
+    assert not v.is_valid("1.2.3-0123")
+    assert not v.is_valid("1.2.3-0123.0123")
+    assert not v.is_valid("1.1.2+.123")
+    assert not v.is_valid("+invalid")
+    assert not v.is_valid("-invalid")
+    assert not v.is_valid("-invalid+invalid")
+    assert not v.is_valid("-invalid.01")
+    assert not v.is_valid("alpha")
+    assert not v.is_valid("alpha.beta")
+    assert not v.is_valid("alpha.beta.1")
+    assert not v.is_valid("alpha.1")
+    assert not v.is_valid("alpha+beta")
+    assert not v.is_valid("alpha_beta")
+    assert not v.is_valid("alpha.")
+    assert not v.is_valid("alpha..")
+    assert not v.is_valid("beta")
+    assert not v.is_valid("1.0.0-alpha_beta")
+    assert not v.is_valid("-alpha.")
+    assert not v.is_valid("1.0.0-alpha..")
+    assert not v.is_valid("1.0.0-alpha..1")
+    assert not v.is_valid("1.0.0-alpha...1")
+    assert not v.is_valid("1.0.0-alpha....1")
+    assert not v.is_valid("1.0.0-alpha.....1")
+    assert not v.is_valid("1.0.0-alpha......1")
+    assert not v.is_valid("1.0.0-alpha.......1")
+    assert not v.is_valid("01.1.1")
+    assert not v.is_valid("1.01.1")
+    assert not v.is_valid("1.1.01")
+    assert not v.is_valid("1.2")
+    assert not v.is_valid("1.2.3.DEV")
+    assert not v.is_valid("1.2-SNAPSHOT")
+    assert not v.is_valid("1.2.31.2.3----RC-SNAPSHOT.12.09.1--..12+788")
+    assert not v.is_valid("1.2-RC-SNAPSHOT")
+    assert not v.is_valid("-1.0.3-gamma+b7718")
+    assert not v.is_valid("+justmeta")
+    assert not v.is_valid("9.8.7+meta+meta")
+    assert not v.is_valid("9.8.7-whatever+meta+meta")

yamale/validators/validators.py

@@ -248,6 +248,19 @@ def __init__(self, *args, **kwargs):
         ]
 
 
+class SemVer(Regex):
+    """Semantic Versioning (semver.org) validator"""
+
+    tag = "semver"
+
+    def __init__(self, *args, **kwargs):
+        super(SemVer, self).__init__(*args, **kwargs)
+        self.regexes = [
+            # https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
+            re.compile("^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"),
+        ]
+
+
 DefaultValidators = {}
 
 for v in util.get_subclasses(Validator):