Add Python support

Python support was added using jython.

JNR version was forced to the jruby version to avoid this issue:
jruby/jruby#5334

build.gradle

@@ -11,6 +11,7 @@ ext {
 	hamcrestVersion   = "1.3"
 	junitVersion      = "4.12"
 	jrubyVersion      = "9.2.7.0"
+	jythonVersion      = "2.7.1b3"
 	jsonVersion       = "20160810"
 	mockitoVersion    = "2.28.2"
 	slf4jVersion      = "1.7.26"
@@ -194,7 +195,9 @@ project("rivescript-core") {
 
 	dependencies {
 		compileOnly "org.json:json:${jsonVersion}"
+		integrationTestRuntime "com.github.jnr:jnr-constants:0.9.12"
 		integrationTestRuntime "org.codehaus.groovy:groovy-all:${groovyVersion}"
+		integrationTestRuntime "org.python:jython:${jythonVersion}"
 		integrationTestRuntime "org.jruby:jruby:${jrubyVersion}"
 	}
 }

rivescript-core/src/integration-test/java/com/rivescript/ObjectIT.java

@@ -20,15 +20,17 @@
  * SOFTWARE.
  */
 
+
+
 import com.rivescript.macro.ObjectHandler;
 import com.rivescript.util.StringUtils;
 import org.junit.Test;
-
 import java.util.HashMap;
 import java.util.Map;
 
 import static com.rivescript.RiveScript.DEFAULT_OBJECT_NOT_FOUND_MESSAGE;
 
+
 /**
  * @author Noah Petherbridge
  * @author Marcel Overdijk
@@ -54,7 +56,7 @@ public void testMacroParsing() {
 				"+ goodbye",
 				"- <call>goodbye</call>"
 		});
-		assertReply("Hello", "Hello world!");
+		assertReply("Hello", "    Hello world!");
 		assertReply("goodbye", DEFAULT_OBJECT_NOT_FOUND_MESSAGE);
 	}
 

rivescript-core/src/integration-test/java/com/rivescript/PythonObjectIT.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2016-2017 the original author or authors.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.rivescript;
+
+import static com.rivescript.RiveScript.DEFAULT_OBJECT_NOT_FOUND_MESSAGE;
+
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.rivescript.lang.python.PythonHandler;
+
+/**
+ * Integration tests for {@link PythonHandler}.
+ *
+ * @author Marcel Overdijk
+ */
+public class PythonObjectIT extends BaseIT {
+
+	@BeforeClass
+	public static void setup() throws Exception {
+		System.setProperty("python.cachedir.skip", "true");
+		System.setProperty("python.import.site", "false");
+	}
+	@Before
+	public void setUp() {
+		rs = new RiveScript();
+		rs.setHandler("python", new PythonHandler());
+		setUp(new String[] {
+				"> object reverse python",
+				"    msg = ' '.join(args)",
+				"    return msg[::-1]",
+				"< object",
+				"> object setname python",
+				"    username = rs.currentUser()",
+				"    rs.setUservar(username, 'name', args[0])",
+				"< object",
+				"+ reverse *",
+				"- <call>reverse <star></call>",
+				"+ my name is *",
+				"- I will remember that.<call>setname \"<formal>\"</call>",
+				"+ what is my name",
+				"- You are <get name>."
+		});
+	}
+
+	@Test
+	public void testReverse() {
+		assertReply("reverse hello world", "dlrow olleh");
+	}
+
+	@Test
+	public void testSetName() {
+		assertReply("my name is john doe", "I will remember that.");
+		assertReply("what is my name", "You are John Doe.");
+	}
+
+	@Test
+	public void testNoRubyHandler() {
+		rs.removeHandler("python");
+		assertReply("reverse hello world", DEFAULT_OBJECT_NOT_FOUND_MESSAGE);
+	}
+}

rivescript-core/src/main/java/com/rivescript/lang/python/PythonHandler.java

@@ -0,0 +1,20 @@
+package com.rivescript.lang.python;
+
+import com.rivescript.lang.jsr223.Jsr223ScriptingHandler;
+import com.rivescript.macro.ObjectHandler;
+
+public class PythonHandler extends Jsr223ScriptingHandler {
+
+	/**
+	 * Constructs a Python {@link ObjectHandler}.
+	 */
+	public PythonHandler() {
+		super("python", ""
+				+ "def %s(rs, args):\n"
+				+ "%s\n"
+				+ "");
+		System.setProperty("python.cachedir.skip", "true");
+		System.setProperty("python.import.site", "false");
+	}
+
+}

rivescript-core/src/main/java/com/rivescript/lang/python/package-info.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2016-2017 the original author or authors.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * Provides Python programming language support classes.
+ */
+package com.rivescript.lang.python;

rivescript-core/src/main/java/com/rivescript/parser/Parser.java

@@ -125,10 +125,10 @@ public Root parse(String filename, String[] code) throws ParserException {
 			lineno = lp + 1;
 
 			// Strip the line.
-			String line = code[lp].trim();
-			if (line.length() == 0) {
+			if (code[lp].trim().length() == 0) {
 				continue; // Skip blank lines!
 			}
+			String line = code[lp];
 
 			// Are we inside an `> object`?
 			if (inObject) {
@@ -150,7 +150,7 @@ public Root parse(String filename, String[] code) throws ParserException {
 				}
 				continue;
 			}
-
+			line = line.trim();
 			// Look for comments.
 			if (line.startsWith("//")) {
 				continue; // Single line comment.