Initial commit

2020-04-27 13:22:01 +02:00
commit 89ee1e1beb
69 changed files with 2806 additions and 0 deletions
--- a/Namen-Leer/src/de/dhbw/compiler/namenscanner/NamenScanner.java
+++ b/Namen-Leer/src/de/dhbw/compiler/namenscanner/NamenScanner.java
@@ -0,0 +1,117 @@
+/* **********************************************
+ * Duale Hochschule Baden-Württemberg Karlsruhe
+ * Prof. Dr. Jörn Eisenbiegler
+ * 
+ * Vorlesung Übersetzerbau
+ * Praxis AS-Scanner tabellengesteuert 1
+ * 
+ * **********************************************
+ */
+
+package de.dhbw.compiler.namenscanner;
+
+import java.io.IOException;
+import java.io.Reader;
+
+import de.dhbw.compiler.namenscanner.Token;
+
+public class NamenScanner {
+		
+	private final int ignore = -2;
+	
+	private Reader in = null;
+	private StringBuffer text = new StringBuffer();
+	
+	private enum NamenState { WS, P, PE, PET, PETR, PETRA, PETE, PETER, A, AN, ANN, ANNA, EOF};
+	
+	private NamenState state = NamenState.WS;
+	private int tokentype = Token.INVALID;
+
+	
+	public NamenScanner(Reader input) {
+		this.in = input;
+	}
+	
+	private Token step(int c, NamenState newState, boolean create, int newTokenType) {
+		Token res = null;
+		if (create) {
+			res = new Token(tokentype, text.toString());
+			text = new StringBuffer();
+		}
+		if (c!=ignore) {
+			text.append((char)c);
+		}
+		state = newState;
+		tokentype = newTokenType;
+		return res;
+	}
+	
+	public Token nextToken() throws Exception {
+		Token token = null;
+		while (token == null) {
+			char c = nextCharacter();
+
+			// peter
+			switch (state) {
+				case WS:
+					switch (c) {
+						case (char) -1: token = step(ignore, NamenState.EOF, false, Token.EOF); break;
+						case ' ': case '\t': case '\n': case '\r': token = step(ignore, NamenState.WS, false, Token.INVALID); break;
+						case 'p': token = step(c, NamenState.P, false, Token.INVALID); break;
+						case 'a': token = step(c, NamenState.A, false, Token.INVALID); break;
+						default:
+							if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')) {
+								token = step(c, NamenState.WS, false, Token.INVALID);
+							} else {
+								throw new Exception("Unexpected character: " + c + " (" + (int) c + ")");
+							} break;
+					} break;
+				case P:
+					switch (c) {
+						case (char) -1: token = step(ignore, NamenState.EOF, false, Token.EOF); break;
+						case ' ': case '\t': case '\n': case '\r': token = step(ignore, NamenState.WS, false, Token.INVALID); break;
+						case '': token = step(c, NamenState.P, false, Token.INVALID); break;
+						case 'A': token = step(c, NamenState.A, false, Token.INVALID); break;
+						default:
+							if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')) {
+								token = step(c, NamenState.WS, false, Token.INVALID);
+							} else {
+								throw new Exception("Unexpected character: " + c + " (" + (int) c + ")");
+							} break;
+					} break;
+				case PE:
+					break;
+				case PET:
+					break;
+				case PETR:
+					break;
+				case PETRA:
+					break;
+				case PETE:
+					break;
+				case PETER:
+					break;
+				case A:
+					break;
+				case AN:
+					break;
+				case ANN:
+					break;
+				case ANNA:
+					break;
+				case EOF:
+					break;
+			}
+		}
+		return token;
+	}
+
+	private char nextCharacter() {
+		try {
+			return (char) in.read();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+}