Merge pull request #18 from superkonduktr/master

add newline_to_br filter

src/main/java/liqp/filters/Filter.java

@@ -38,6 +38,7 @@ public abstract class Filter extends LValue {
         registerFilter(new liqp.filters.Map());
         registerFilter(new Minus());
         registerFilter(new Modulo());
+        registerFilter(new Newline_To_Br());
         registerFilter(new Plus());
         registerFilter(new Prepend());
         registerFilter(new Remove());

src/main/java/liqp/filters/Newline_To_Br.java

@@ -0,0 +1,15 @@
+package liqp.filters;
+
+class Newline_To_Br extends Filter {
+
+    /*
+     * newline_to_br(input)
+     *
+     * Add <br /> tags in front of all newlines in input string
+     */
+    @Override
+    public Object apply(Object value, Object... params) {
+
+        return super.asString(value).replaceAll("[\n]", "<br />\n");
+    }
+}

src/test/java/liqp/filters/Newline_To_BrTest.java

@@ -0,0 +1,29 @@
+package liqp.filters;
+
+import liqp.Template;
+import org.antlr.runtime.RecognitionException;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+public class Newline_To_BrTest {
+
+    @Test
+    public void applyTest() throws RecognitionException {
+
+        String[][] tests = {
+                {"{{ '' | newline_to_br }}", ""},
+                {"{{ nil | newline_to_br }}", ""},
+                {"{{ 'Line 1\nLine 2' | newline_to_br }}", "Line 1<br />\nLine 2"}
+        };
+
+        for (String[] test : tests) {
+
+            Template template = Template.parse(test[0]);
+            String rendered = String.valueOf(template.render());
+
+            assertThat(rendered, is(test[1]));
+        }
+    }
+}