Renamed packages to match Java guidelines.

Triangle.Compiler/src/main/java/triangle/contextualAnalyzer/IdEntry.java

@@ -0,0 +1,33 @@
+/*
+ * @(#)IdEntry.java                        2.1 2003/10/07
+ *
+ * Copyright (C) 1999, 2003 D.A. Watt and D.F. Brown
+ * Dept. of Computing Science, University of Glasgow, Glasgow G12 8QQ Scotland
+ * and School of Computer and Math Sciences, The Robert Gordon University,
+ * St. Andrew Street, Aberdeen AB25 1HG, Scotland.
+ * All rights reserved.
+ *
+ * This software is provided free for educational use only. It may
+ * not be used for commercial purposes without the prior written permission
+ * of the authors.
+ */
+
+package triangle.contextualAnalyzer;
+
+import triangle.abstractSyntaxTrees.declarations.Declaration;
+
+public class IdEntry {
+
+	protected String id;
+	protected Declaration attr;
+	protected int level;
+	protected IdEntry previous;
+
+	IdEntry(String id, Declaration attr, int level, IdEntry previous) {
+		this.id = id;
+		this.attr = attr;
+		this.level = level;
+		this.previous = previous;
+	}
+
+}

Triangle.Compiler/src/main/java/triangle/contextualAnalyzer/IdentificationTable.java

@@ -0,0 +1,81 @@
+/*
+ * @(#)IdentificationTable.java                2.1 2003/10/07
+ *
+ * Copyright (C) 1999, 2003 D.A. Watt and D.F. Brown
+ * Dept. of Computing Science, University of Glasgow, Glasgow G12 8QQ Scotland
+ * and School of Computer and Math Sciences, The Robert Gordon University,
+ * St. Andrew Street, Aberdeen AB25 1HG, Scotland.
+ * All rights reserved.
+ *
+ * This software is provided free for educational use only. It may
+ * not be used for commercial purposes without the prior written permission
+ * of the authors.
+ */
+
+package triangle.contextualAnalyzer;
+
+import triangle.abstractSyntaxTrees.declarations.Declaration;
+
+public final class IdentificationTable {
+
+	private int level;
+	private IdEntry latest;
+
+	public IdentificationTable() {
+		level = 0;
+		latest = null;
+	}
+
+	// Opens a new level in the identification table, 1 higher than the
+	// current topmost level.
+
+	public void openScope() {
+		level++;
+	}
+
+	// Closes the topmost level in the identification table, discarding
+	// all entries belonging to that level.
+
+	public void closeScope() {
+		// Presumably, idTable.level > 0.
+		var entry = this.latest;
+		while (entry.level == this.level) {
+			entry = entry.previous;
+		}
+
+		this.level--;
+		this.latest = entry;
+	}
+
+	// Makes a new entry in the identification table for the given identifier
+	// and attribute. The new entry belongs to the current level.
+	// duplicated is set to to true iff there is already an entry for the
+	// same identifier at the current level.
+
+	public void enter(String id, Declaration attr) {
+		attr.duplicated = retrieve(id) != null;
+		this.latest = new IdEntry(id, attr, this.level, this.latest);
+	}
+
+	// Finds an entry for the given identifier in the identification table,
+	// if any. If there are several entries for that identifier, finds the
+	// entry at the highest level, in accordance with the scope rules.
+	// Returns null iff no entry is found.
+	// otherwise returns the attribute field of the entry found.
+
+	public Declaration retrieve(String id) {
+		var entry = this.latest;
+		while (true) {
+			if (entry == null) {
+				break;
+			} else if (entry.id.equals(id)) {
+				return entry.attr;
+			} else {
+				entry = entry.previous;
+			}
+		}
+
+		return null;
+	}
+
+}