Added Normalize renderer

lib/build.gradle.kts

@@ -13,7 +13,7 @@ plugins {
     id("com.github.ben-manes.versions") version "0.46.0"
 }
 
-val rifeVersion by rootProject.extra { "1.5.0-SNAPSHOT" }
+val rifeVersion by rootProject.extra { "1.5.0" }
 
 group = "com.uwyn.rife2"
 version = "0.9.0-SNAPSHOT"

lib/src/main/java/rife/render/Normalize.java

@@ -0,0 +1,45 @@
+/*
+ *  Copyright 2023 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+package rife.render;
+
+import rife.template.Template;
+import rife.template.ValueRenderer;
+
+/**
+ * <p>Normalizes a template value for inclusion in URL path.</p>
+ *
+ * <p>Usage:</p>
+ *
+ * <pre>
+ *   &lt;!--v render:rife.render.Normalize:valueId/--&gt;
+ *   {{v render:rife.render.Normalize:valueId/}}
+ * </pre>
+ *
+ * @author <a href="https://erik.thauvin.net/">Erik C. Thauvin</a>
+ * @see <a href="https://github.com/rife2/rife2-template-renderers/wiki/rife.render.Normalize">rife.render.Normalize</a>
+ * @since 1.0
+ */
+public class Normalize implements ValueRenderer {
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String render(Template template, String valueId, String differentiator) {
+        return RenderUtils.normalize(template.getValueOrAttribute(differentiator));
+    }
+}

lib/src/main/java/rife/render/RenderUtils.java

@@ -24,6 +24,7 @@ import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
+import java.text.Normalizer;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
 import java.time.temporal.ChronoField;
@@ -121,6 +122,34 @@ public final class RenderUtils {
         return "";
     }
 
+    /**
+     * Normalizes a String for inclusion in a URL path.
+     *
+     * @param src The source String
+     * @return The normalized String
+     */
+    public static String normalize(String src) {
+        var sb = new StringBuilder(src.length());
+        var normalized = Normalizer.normalize(src.trim(), Normalizer.Form.NFD);
+        boolean space = false;
+        for (var c : normalized.toCharArray()) {
+            if (c <= '\u007F') { // ascii only
+                if (!space && c == ' ') {
+                    space = true;
+                    sb.append('-');
+                } else {
+                    space = false;
+                    if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z')) {
+                        sb.append(c);
+                    } else if (c >= 'A' && c <= 'Z') {
+                        sb.append((char) (c + 32)); // lowercase
+                    }
+                }
+            }
+        }
+        return sb.toString();
+    }
+
     /**
      * Returns the plural form of a word, if count &gt; 1.
      *

lib/src/test/java/rife/render/TestEncode.java

@@ -93,4 +93,13 @@ class TestEncode {
         t.setAttribute(TestCase.FOO, "a test &");
         assertThat(t.getContent()).isEqualTo("<test>\n    <foo>a test &amp;</foo>\n</test>");
     }
+
+    @Test
+    void testNormalize() {
+        var t = TemplateFactory.HTML.get("normalize");
+        var foo = "News for January 6, 2023 (Paris)";
+        t.setValue(TestCase.FOO, foo);
+        assertThat(t.getContent()).isEqualTo("<a href=\"https://example.com/news/news-for-january-6-2023-paris\">"
+                + foo + "</a>");
+    }
 }

lib/src/test/resources/templates/normalize.html

@@ -0,0 +1 @@
+<a href="https://example.com/news/{{v render:rife.render.Normalize:foo/}}"><!--v foo/--></a>