PY-26963: Create language for Django 2.0 url syntax

python/src/com/jetbrains/extensions/RegExpPatternExt.kt

@@ -0,0 +1,7 @@
+// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.jetbrains.extensions
+
+import org.intellij.lang.regexp.psi.RegExpPattern
+import java.util.regex.Pattern
+
+fun RegExpPattern.asPattern() = Pattern.compile(text)!!

python/src/com/jetbrains/extensions/StringLiteralExpressionExt.kt

@@ -0,0 +1,34 @@
+// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.jetbrains.extensions
+
+import com.jetbrains.python.FunctionParameter
+import com.jetbrains.python.psi.PyArgumentList
+import com.jetbrains.python.psi.PyExpression
+import com.jetbrains.python.psi.PyKeywordArgument
+import com.jetbrains.python.psi.StringLiteralExpression
+
+
+/**
+ * If literal is argument of some function call -- return callee
+ */
+fun StringLiteralExpression.getCalleeIfArgument(argumentPosition: Int, argumentName: String? = null): PyExpression? {
+  val parent = this.parent ?: return null
+
+  val argumentList = when (parent) {
+                       is PyArgumentList -> parent
+                       is PyKeywordArgument -> parent.parent as? PyArgumentList
+                       else -> null
+                     } ?: return null
+
+  if ((this == argumentList.arguments.getOrNull(argumentPosition))
+      ||
+      (this == argumentName?.run { argumentList.getKeywordArgument(this@run)?.valueExpression })) {
+    return argumentList.callExpression?.callee
+  }
+  return null
+}
+
+/**
+ * @see getCalleeIfArgument
+ */
+fun StringLiteralExpression.getCalleeIfArgument(argument: FunctionParameter) = this.getCalleeIfArgument(argument.position, argument.name)

python/testSrc/com/jetbrains/env/PyEnvTestCase.java

@@ -38,7 +38,7 @@ import java.util.*;
 /**
  * @author traff
  *
-*  All inhertors must be in {@link com.jetbrains.env.}.*
+*  All inhertors must be in {@link com.jetbrains.env}.*
  */
 public abstract class PyEnvTestCase {
   private static final Logger LOG = Logger.getInstance(PyEnvTestCase.class.getName());