Created unit test for simple Lexer testing

Author: halirutan

tests/de/halirutan/mathematica/MathematicaLexerTest.java

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+/*
+ * Copyright (c) 2016 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;
+
+import com.intellij.lexer.Lexer;
+import com.intellij.testFramework.LexerTestCase;
+import de.halirutan.mathematica.lexer.MathematicaLexer;
+
+/**
+ * Test small, important code snippets for their lexer output.
+ * @author patrick (31.10.16)
+ */
+public class MathematicaLexerTest extends LexerTestCase {
+  @Override
+  protected Lexer createLexer() {
+    return new MathematicaLexer();
+  }
+
+  public void testSlots1() throws Exception {
+    doTest("#[#Test&, #\"Test\"&]&;",
+        "SLOT ('#')\n" +
+            "LEFT_BRACKET ('[')\n" +
+            "ASSOCIATION_SLOT ('#Test')\n" +
+            "FUNCTION ('&')\n" +
+            "COMMA (',')\n" +
+            "WHITE_SPACE (' ')\n" +
+            "ASSOCIATION_SLOT ('#\"Test\"')\n" +
+            "FUNCTION ('&')\n" +
+            "RIGHT_BRACKET (']')\n" +
+            "FUNCTION ('&')\n" +
+            "SEMICOLON (';')");
+  }
+
+  public void testNumbers() throws Exception {
+    doTest("1", "NUMBER ('1')");
+    doTest("1.0", "NUMBER ('1.0')");
+    doTest("16^^abc", "NUMBER ('16^^abc')");
+    doTest("16^^abc.1abc", "NUMBER ('16^^abc.1abc')");
+    doTest("2*^3", "NUMBER ('2*^3')");
+    doTest("2*^-3", "NUMBER ('2*^-3')");
+    doTest("12`", "NUMBER ('12`')");
+    doTest("12`12", "NUMBER ('12`12')");
+    doTest("12``12", "NUMBER ('12``12')");
+  }
+
+  public void testRepeatedAmbiguity() throws Exception {
+    // Actually, this is not what Mathematica parses which is Repeated[1]
+    // but the documentation states that the point for the number 1. should bind stronger
+    doTest("1..", "NUMBER ('1.')\n" + "POINT ('.')");
+
+    // These are the workarounds to get Repeated
+    doTest("1 ..", "NUMBER ('1')\n" + "WHITE_SPACE (' ')\n" + "REPEATED ('..')");
+    doTest("(1)..", "LEFT_PAR ('(')\n" + "NUMBER ('1')\n" + "RIGHT_PAR (')')\n" + "REPEATED ('..')");
+  }
+
+  @Override
+  protected String getDirPath() {
+    return null;
+  }
+
+  /**
+   * Helper method to create and check the lexer output of small code snippets.
+   * @param inputCode String with the code to scan
+   */
+  @SuppressWarnings("unused")
+  private void printLexerOutput(String inputCode) {
+    System.out.println(printTokens(inputCode, 0));
+  }
+}