add money filter

Signed-off-by: Thomas Skjølberg <[email protected]>

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

@@ -40,6 +40,7 @@ public abstract class Filter extends LValue {
         registerFilter(new liqp.filters.Map());
         registerFilter(new Minus());
         registerFilter(new Modulo());
+        registerFilter(new Money());
         registerFilter(new Newline_To_Br());
         registerFilter(new Plus());
         registerFilter(new Prepend());

src/main/java/liqp/filters/Money.java

@@ -0,0 +1,39 @@
+package liqp.filters;
+
+import java.math.BigDecimal;
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+import java.text.NumberFormat;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+class Money extends Filter {
+
+    /*
+     * money(input)
+     *
+     * Attempts to format a string containing numeric values as currency.
+     */
+    @Override
+    public Object apply(Object value, Object... params) {
+
+        String val = super.asString(value);
+        String res;
+        Pattern r = Pattern.compile("(.*?)(\\d+)(.*)");
+        Matcher m = r.matcher(val);
+
+        if (m.find()) {
+            BigDecimal n = new BigDecimal(m.group(2));
+            DecimalFormat formatter = (DecimalFormat) NumberFormat.getInstance(Locale.US);
+            DecimalFormatSymbols symbols = formatter.getDecimalFormatSymbols();
+            symbols.setGroupingSeparator(' ');
+            formatter.setDecimalFormatSymbols(symbols);
+            res = m.group(1) + formatter.format(n.longValue()) + m.group(3);
+        } else {
+            res = super.asString(val);
+        }
+
+        return res;
+    }
+}

src/test/java/liqp/filters/MoneyTest.java

@@ -0,0 +1,31 @@
+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 MoneyTest {
+
+    @Test
+    public void applyTest() throws RecognitionException {
+
+        String[][] tests = {
+                {"{{ '1000 $' | money }}", "1 000 $"},
+                {"{{ '£20000' | money }}", "£20 000"},
+                {"{{ 200 | money}}", "200"},
+                {"{{ 'Amazing! 1500.50 eur' | money}}", "Amazing! 1 500.50 eur"},
+                {"{{ 'wut' | money }}", "wut"},
+        };
+
+        for (String[] test : tests) {
+
+            Template template = Template.parse(test[0]);
+            String rendered = String.valueOf(template.render());
+
+            assertThat(rendered, is(test[1]));
+        }
+    }
+}