1 files changed, 81 insertions, 0 deletions
diff --git a/Homework/cs5300/project-three/parser/ParserException.java b/Homework/cs5300/project-three/parser/ParserException.java
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+++ b/Homework/cs5300/project-three/parser/ParserException.java
@@ -0,0 +1,81 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package parser;
+
+import java.util.ArrayList;
+import org.antlr.v4.runtime.Token;
+
+/**
+ *
+ * @author edwajohn
+ */
+public class ParserException extends Exception {
+
+  /**
+   * Create a ParserException. This is a convenience factory method to easily
+   * format your output to meet project specification.
+   *
+   * @param words the words being parsed
+   * @param i the index to the current word being parsed
+   * @return
+   */
+  public static ParserException create(final ArrayList<? extends Token> words, final int i) {
+    String msg;
+    if (i < words.size()) {
+      msg = "Error parsing token \"" + words.get(i).getText() + "\" in \n    ";
+      int preLen = 4;
+      for (int j = 0; j < i; ++j) {
+        Token token = words.get(j);
+        msg = msg + token.getText() + " ";
+        preLen += token.getText().length() + 1;
+      }
+      final int curLen = words.get(i).getText().length();
+      msg = msg + words.get(i).getText();
+      if (i < words.size() - 1) {
+        msg = msg + " ";
+      }
+      for (int j = i + 1; j < words.size(); ++j) {
+        Token token = words.get(j);
+        msg = msg + token.getText();
+        if (j < words.size() - 1) {
+          msg = msg + " ";
+        }
+      }
+
+      msg = msg + "\n";
+      for (int j = 0; j < preLen; ++j) {
+        msg += " ";
+      }
+      for (int j = 0; j < curLen; ++j) {
+        msg += "^";
+      }
+    } else {
+      msg = "Unexpectedly reached end of file in\n";
+      for (int j = 0; j < words.size(); ++j) {
+        Token token = words.get(j);
+        msg = msg + token.getText();
+        if (j < words.size() - 1) {
+          msg = msg + " ";
+        }
+      }
+
+    }
+    return new ParserException(msg);
+  }
+
+  /**
+   * Constructor. You will most likely NOT use this constructor directly, but
+   * rather use the convenience factory method create(). You may choose to use
+   * this constructor, however, if your data structures are set up differently
+   * than what the factory method expects.
+   *
+   * @param msg
+   */
+  public ParserException(String msg) {
+    super(msg);
+  }
+
+}