Implemented a spell checking intention.

resources/META-INF/plugin.xml

@@ -23,7 +23,7 @@
   <id>de.halirutan.mathematica</id>
   <name>Mathematica Support</name>
   <category>Custom Language</category>
-  <version>2.1.1</version>
+  <version>2.2</version>
   <idea-version since-build="163"/>
   <vendor email="[email protected]" url="http://mathematicaplugin.halirutan.de">Patrick Scheibe</vendor>
   <depends>com.intellij.modules.lang</depends>
@@ -67,6 +67,7 @@
       <i>New features and bug-fixes:</i>
       <br/>
       <ul>
+      <li>Spell check for symbols, comments and strings</li>
       <li>Code folding based on section comments like (* ::Section:: *)</li>
       <li>SurroundWith (Ctrl+Alt+T) will now do something useful when pressed without an active selection</li>
       <li>Added Ctrl+Space completion inside comments</li>
@@ -187,6 +188,8 @@
     <gotoRelatedProvider
         implementation="de.halirutan.mathematica.codeinsight.navigation.MathematicaGotoRelatedProvider"/>
 
+    <spellchecker.support language="Mathematica"
+                          implementationClass="de.halirutan.mathematica.codeinsight.spellcheck.MathematicaSpellCheck"/>
     <intentionAction>
       <className>de.halirutan.mathematica.intentions.localization.MoveVariableToLocalisation</className>
     </intentionAction>

src/de/halirutan/mathematica/codeinsight/spellcheck/MathematicaSpellCheck.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2017 Patrick Scheibe
+ * 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 de.halirutan.mathematica.codeinsight.spellcheck;
+
+import com.intellij.codeInspection.SuppressionUtil;
+import com.intellij.psi.PsiComment;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiLanguageInjectionHost;
+import com.intellij.psi.PsiWhiteSpace;
+import com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil;
+import com.intellij.spellchecker.tokenizer.PsiIdentifierOwnerTokenizer;
+import com.intellij.spellchecker.tokenizer.SpellcheckingStrategy;
+import com.intellij.spellchecker.tokenizer.Tokenizer;
+import de.halirutan.mathematica.parsing.psi.api.Symbol;
+import de.halirutan.mathematica.parsing.psi.api.string.MString;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Spell check for Mathematica. This works out of the box since Mathematica uses Camel Case built in functions which
+ * are separated correctly by the built-in tokenizer for spelling.
+ *
+ * @author patrick (08.06.17).
+ */
+public class MathematicaSpellCheck extends SpellcheckingStrategy {
+
+  @NotNull
+  public Tokenizer getTokenizer(PsiElement element) {
+    if (element instanceof PsiWhiteSpace) {
+      return EMPTY_TOKENIZER;
+    }
+    if (element instanceof PsiLanguageInjectionHost && InjectedLanguageUtil.hasInjections((PsiLanguageInjectionHost) element)) {
+      return EMPTY_TOKENIZER;
+    }
+    if (element instanceof Symbol) return new PsiIdentifierOwnerTokenizer();
+    if (element instanceof MString) return TEXT_TOKENIZER;
+    if (element instanceof PsiComment) {
+      if (SuppressionUtil.isSuppressionComment(element)) {
+        return EMPTY_TOKENIZER;
+      }
+      return myCommentTokenizer;
+    }
+    return EMPTY_TOKENIZER;
+  }
+
+}