Non-integer numeric parameters aren't supported fix #573

Author: jknack

handlebars/src/main/antlr4/com/github/jknack/handlebars/internal/HbsLexer.g4

@@ -280,9 +280,9 @@ EQ
     '='
   ;
 
-INT
+NUMBER
   :
-    '-'? [0-9]+
+    '-'? [0-9]* '.'? [0-9]+
   ;
 
 BOOLEAN

handlebars/src/main/antlr4/com/github/jknack/handlebars/internal/HbsParser.g4

@@ -179,7 +179,7 @@ param
   :
     DOUBLE_STRING #stringParam
   | SINGLE_STRING #charParam
-  | INT           #intParam
+  | NUMBER           #numberParam
   | BOOLEAN       #boolParam
   | QID           #refParam
   | LP sexpr RP   #subParamExpr

handlebars/src/main/java/com/github/jknack/handlebars/internal/TemplateBuilder.java

@@ -56,7 +56,6 @@
 import com.github.jknack.handlebars.internal.HbsParser.ElseStmtContext;
 import com.github.jknack.handlebars.internal.HbsParser.EscapeContext;
 import com.github.jknack.handlebars.internal.HbsParser.HashContext;
-import com.github.jknack.handlebars.internal.HbsParser.IntParamContext;
 import com.github.jknack.handlebars.internal.HbsParser.LiteralPathContext;
 import com.github.jknack.handlebars.internal.HbsParser.NewlineContext;
 import com.github.jknack.handlebars.internal.HbsParser.ParamContext;
@@ -504,9 +503,12 @@ public Object visitRefParam(final RefParamContext ctx) {
     return new RefParam(PathCompiler.compile(ctx.getText(), handlebars.parentScopeResolution()));
   }
 
-  @Override
-  public Object visitIntParam(final IntParamContext ctx) {
-    return new DefParam(Integer.parseInt(ctx.getText()));
+  @Override public Object visitNumberParam(HbsParser.NumberParamContext ctx) {
+    try {
+      return new DefParam(Integer.parseInt(ctx.getText()));
+    } catch (NumberFormatException x) {
+      return new DefParam(Double.parseDouble(ctx.getText()));
+    }
   }
 
   @Override

handlebars/src/test/java/com/github/jknack/handlebars/issues/Issue573.java

@@ -0,0 +1,16 @@
+package com.github.jknack.handlebars.issues;
+
+import com.github.jknack.handlebars.v4Test;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+public class Issue573 extends v4Test {
+
+  @Test
+  public void shouldSupportNumberExpression() throws Exception {
+    shouldCompileTo("{{#if 1.5}}OK{{/if}}", $, "OK");
+    shouldCompileTo("{{#if 0.5}}OK{{/if}}", $, "OK");
+    shouldCompileTo("{{#if .6}}OK{{/if}}", $, "OK");
+  }
+}