2 files changed, 101 insertions, 0 deletions
diff --git a/funcs/semver.go b/funcs/semver.go
new file mode 100644
index 00000000..0212c998
--- /dev/null
+++ b/funcs/semver.go
@@ -0,0 +1,40 @@
+package funcs
+
+import (
+	"context"
+
+	"github.com/Masterminds/semver/v3"
+)
+
+// CreateSemverFuncs -
+func CreateSemverFuncs(ctx context.Context) map[string]interface{} {
+	ns := &SemverFuncs{ctx}
+	return map[string]interface{}{
+		"semver": func() interface{} { return ns },
+	}
+}
+
+// SemverFuncs -
+type SemverFuncs struct {
+	ctx context.Context
+}
+
+// Semver -
+func (SemverFuncs) Semver(version string) (*semver.Version, error) {
+	return semver.NewVersion(version)
+}
+
+// CheckConstraint -
+func (SemverFuncs) CheckConstraint(constraint, in string) (bool, error) {
+	c, err := semver.NewConstraint(constraint)
+	if err != nil {
+		return false, err
+	}
+
+	v, err := semver.NewVersion(in)
+	if err != nil {
+		return false, err
+	}
+
+	return c.Check(v), nil
+}
diff --git a/funcs/semver_test.go b/funcs/semver_test.go
new file mode 100644
index 00000000..f10aad5c
--- /dev/null
+++ b/funcs/semver_test.go
@@ -0,0 +1,61 @@
+package funcs
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSemverFuncs_MatchConstraint(t *testing.T) {
+	tests := []struct {
+		name       string
+		constraint string
+		in         string
+		want       bool
+		wantErr    bool
+	}{
+		{
+			name:       "mached constraint",
+			constraint: ">=1.0.0",
+			in:         "v1.1.1",
+			want:       true,
+			wantErr:    false,
+		},
+		{
+			name:       "not matched constraint",
+			constraint: "<1.0.0",
+			in:         "v1.1.1",
+			want:       false,
+			wantErr:    false,
+		},
+		{
+			name:       "wrong constraint",
+			constraint: "abc",
+			in:         "v1.1.1",
+			want:       false,
+			wantErr:    true,
+		},
+		{
+			name:       "wrong in",
+			constraint: ">1.0.0",
+			in:         "va.b.c",
+			want:       false,
+			wantErr:    true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := SemverFuncs{
+				ctx: context.Background(),
+			}
+			got, err := s.CheckConstraint(tt.constraint, tt.in)
+			if tt.wantErr {
+				assert.Errorf(t, err, "SemverFuncs.CheckConstraint() error = %v, wantErr %v", err, tt.wantErr)
+			} else {
+				assert.NoErrorf(t, err, "SemverFuncs.CheckConstraint() error = %v, wantErr %v", err, tt.wantErr)
+				assert.Equal(t, tt.want, got)
+			}
+		})
+	}
+}